Fire reporting method, program, fire reporting system, and sensor

Abstract

The present invention addresses the problem of estimating the position of the source of a fire.　This fire reporting method includes a first acquisition step, a threshold value setting step, a second acquisition step, and a reporting step. In the first acquisition step, a first temperature and a first smoke concentration are acquired. In a case where, in the threshold value setting step, the first temperature detected by one temperature detection unit (4) exceeds a first temperature threshold value, a threshold value for the temperature of a plurality of temperature detection units (4) of a second sensor (E0) adjacent to a first sensor (E0) on the one temperature detection unit (4) side is changed from the first temperature threshold value to a second temperature threshold value below the first temperature threshold value, and a smoke concentration threshold value of a smoke detection unit (2) of the second sensor (E0) is changed from a first smoke threshold value to a second smoke threshold value below the first smoke threshold value. In the second acquisition step, a second temperature and a second smoke concentration of smoke are acquired. In the reporting step, in at least one of a case where the second temperature exceeds the second temperature threshold value and a case where the second smoke concentration exceeds the second smoke threshold value, it is reported that a fire, the source of which has a position between the first sensor (E0) and the second sensor (E0), has occurred.

Description

Fire notification method, program, fire notification system and detector

[0001] The present disclosure relates to a fire notification method, a program, a fire notification system, and a detector, and more particularly to a fire notification method, a program, a fire notification system, and a detector that detect heat and smoke generated by a fire.

[0002] 2. Description of the Related Art Conventionally, a detector having a smoke detection chamber for detecting smoke and a heat detection section for detecting heat has been known.

[0003] When a fire breaks out in a space where a plurality of detectors such as those described in Patent Document 1 are installed, there is a demand for estimating the location of the source of the fire.

[0004] International Publication No. 2021 / 215460

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a fire notification method, a program, a fire notification system, and a detector that can estimate the location of the source of a fire.

[0006] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a first detector among a plurality of detectors, the first detector including a smoke detection unit having a first smoke threshold set therein, the first smoke threshold being a threshold for determining whether a fire has occurred, and a plurality of temperature detection units arranged around the smoke detection unit, each having a first temperature threshold set therein, the first temperature being a threshold for determining whether a fire has occurred. The first temperature and the first smoke density of the smoke detected by the smoke detection unit of the first detector are acquired. In the threshold setting step, when the first temperature detected by one of the plurality of temperature detection units included in the first sensor exceeds the first temperature threshold, the temperature thresholds of the plurality of temperature detection units included in a second sensor arranged adjacent to the first sensor on the side of the one of the plurality of sensor, are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and the smoke density threshold of the smoke detection unit included in the second sensor is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperature detected by the plurality of temperature detection units included in the second sensor and a second smoke density of the smoke detected by the smoke detection unit included in the second sensor are acquired. In the notification step, when the second temperature exceeds the second temperature threshold and / or the second smoke density exceeds the second smoke threshold, notification is made that a fire has occurred originating between the first sensor and the second sensor.

[0007] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a first detector among a plurality of detectors, the first detector including a smoke detection unit having a first smoke threshold set therein, the first smoke threshold being a threshold for determining whether a fire has occurred, and a plurality of temperature detection units arranged around the smoke detection unit, each having a first temperature threshold set therein, the first temperature being a threshold for determining whether a fire has occurred. The first temperature and the first smoke density of the smoke detected by the smoke detection unit of the first detector are acquired. In the threshold setting step, when the first smoke density detected by the smoke detection unit of the first detector exceeds the first smoke threshold, the temperature thresholds of the plurality of temperature detection units of a second detector among the plurality of detectors arranged adjacent to the first detector are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and the smoke density threshold of the smoke detection unit of the second detector is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, second temperatures detected by the plurality of temperature detection units of the second detector and a second smoke density of smoke detected by the smoke detection unit of the second detector are acquired. In the notification step, when the second temperature exceeds the second temperature threshold and / or the second smoke density exceeds the second smoke threshold, notification is made that a fire has occurred originating between the first detector and the second detector.

[0008] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a first detector among a plurality of detectors, the first detector including a smoke detection unit having a first smoke threshold set therein, the first smoke threshold being a threshold for determining whether a fire has occurred, and a plurality of temperature detection units arranged around the smoke detection unit, each having a first temperature threshold set therein, the first temperature being a threshold for determining whether a fire has occurred. The first temperature and the first smoke density of the smoke detected by the smoke detection unit of the first detector are acquired. In the threshold setting step, when the first temperature detected by one of the plurality of temperature detection units possessed by the first sensor exceeds the first temperature threshold, the temperature thresholds of the plurality of temperature detection units possessed by a second sensor disposed adjacent to the first sensor on the opposite side to the one temperature detection unit of the plurality of sensors are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and the smoke concentration threshold of the smoke detection unit possessed by the second sensor is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperature detected by the plurality of temperature detection units possessed by the second sensor and the second smoke concentration of the smoke detected by the smoke detection unit possessed by the second sensor are acquired. In the notification step, when the second temperature exceeds the second temperature threshold and / or when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred originating from a position between the first sensor and a third sensor located adjacent to the first sensor on the temperature detection unit side of one of the plurality of sensors.

[0009] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a first detector among a plurality of detectors, the first detector including a smoke detection unit having a first smoke threshold set therein, the first smoke threshold being a threshold for determining whether a fire has occurred, and a plurality of temperature detection units arranged around the smoke detection unit, each having a first temperature threshold set therein, the first temperature being a threshold for determining whether a fire has occurred. The first temperature and the first smoke density of the smoke detected by the smoke detection unit of the first detector are acquired. In the threshold setting step, when the first smoke density detected by the smoke detection unit of the first sensor exceeds the first smoke threshold, the temperature thresholds of the temperature detection units of each of the plurality of second sensors arranged adjacent to the first sensor among the plurality of sensors are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and the smoke density thresholds of the smoke detection units of each of the plurality of second sensors are changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperatures detected by the temperature detection units of each of the plurality of second sensors and the second smoke density of the smoke detected by the smoke detection units of each of the plurality of second sensors are acquired. In the notification step, when the second temperature detected by the plurality of temperature detection units possessed by one of the plurality of second detectors exceeds the second temperature threshold, and / or when the second smoke concentration detected by the smoke detection unit possessed by the one of the plurality of second detectors exceeds the second smoke threshold, notification is given that a fire has occurred originating from a position between the first detector and a third detector located adjacent to the one of the plurality of second detectors on the opposite side of the one of the plurality of second detectors.

[0010] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by the plurality of temperature detection units of a first detector among a plurality of detectors including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for determining whether a fire has occurred. In the threshold setting step, when the first temperature detected by one of the plurality of temperature detection units included in the first sensor exceeds the first temperature threshold, the temperature thresholds of the plurality of temperature detection units included in a second sensor arranged adjacent to the first sensor on the side of the one of the plurality of sensor from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the plurality of gas detection units included in the second sensor are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit included in the second sensor is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperatures detected by the plurality of temperature detection units included in the second sensor, the second gas concentrations detected by the plurality of gas detection units included in the second sensor, and the second smoke concentration of smoke detected by the smoke detection unit included in the second sensor are acquired. In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred with its source located between the first detector and the second detector.

[0011] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by the plurality of temperature detection units of a first detector among a plurality of detectors including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for determining whether a fire has occurred. In the threshold setting step, when the first gas concentration detected by one gas detection unit of the plurality of gas detection units possessed by the first detector exceeds the first gas threshold, the temperature thresholds of the plurality of temperature detection units possessed by a second detector arranged adjacent to the first detector on the side of the one gas detection unit among the plurality of detectors are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the plurality of gas detection units possessed by the second detector are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit possessed by the second detector is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperatures detected by the plurality of temperature detection units possessed by the second detector, the second gas concentrations detected by the plurality of gas detection units possessed by the second detector, and the second smoke concentration of smoke detected by the smoke detection unit possessed by the second detector are acquired. In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred with its source located between the first detector and the second detector.

[0012] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by the plurality of temperature detection units of a first detector among a plurality of detectors including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for determining whether a fire has occurred. In the threshold setting step, when the first smoke density detected by the smoke detection unit of the first detector exceeds the first smoke threshold, the temperature thresholds of the plurality of temperature detection units of a second detector among the plurality of detectors arranged adjacent to the first detector are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the plurality of gas detection units of the second detector are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke density threshold of the smoke detection unit of the second detector is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperatures detected by the plurality of temperature detection units of the second detector, the second gas concentrations detected by the plurality of gas detection units of the second detector, and the second smoke density of the smoke detected by the smoke detection unit of the second detector are acquired. In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred with its source located between the first detector and the second detector.

[0013] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by the plurality of temperature detection units of a first detector among a plurality of detectors including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for determining whether a fire has occurred. In the threshold setting step, when the first temperature detected by one of the plurality of temperature detection units included in the first sensor exceeds the first temperature threshold, the temperature thresholds of the plurality of temperature detection units included in a second sensor arranged adjacent to the first sensor on the opposite side of the one temperature detection unit among the plurality of sensors are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the plurality of gas detection units included in the second sensor are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit included in the second sensor is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperatures detected by the plurality of temperature detection units included in the second sensor, the second gas concentrations detected by the plurality of gas detection units included in the second sensor, and the second smoke concentration of smoke detected by the smoke detection unit included in the second sensor are acquired. In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred with its source located between the first sensor and a third sensor located adjacent to the first sensor on the temperature detection unit side of one of the plurality of sensors.

[0014] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by the plurality of temperature detection units of a first detector among a plurality of detectors including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for determining whether a fire has occurred. In the threshold setting step, when the first gas concentration detected by one gas detection unit of the plurality of gas detection units possessed by the first detector exceeds the first gas threshold, the temperature thresholds of the plurality of temperature detection units possessed by a second detector disposed adjacent to the first detector on the opposite side of the one gas detection unit of the plurality of detectors are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the plurality of gas detection units possessed by the second detector are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit possessed by the second detector is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperatures detected by the plurality of temperature detection units possessed by the second detector, the second gas concentrations detected by the plurality of gas detection units possessed by the second detector, and the second smoke concentration of smoke detected by the smoke detection unit possessed by the second detector are acquired. In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold, notification is given that a fire has occurred with its source located between the first detector and a third detector that is located adjacent to the first detector on the gas detection unit side of one of the plurality of detectors.

[0015] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by the plurality of temperature detection units of a first detector among a plurality of detectors including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for determining whether a fire has occurred. In the threshold setting step, when the first smoke density detected by the smoke detection unit of the first detector exceeds the first smoke threshold, the temperature thresholds of the temperature detection units of each of the plurality of second detectors arranged adjacent to the first detector among the plurality of detectors are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the gas detection units of each of the plurality of second detectors are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration thresholds of the smoke detection units of each of the plurality of second detectors are changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, second temperatures detected by the temperature detection units of each of the plurality of second detectors, second gas concentrations detected by the gas detection units of each of the plurality of second detectors, and second smoke density of smoke detected by the smoke detection units of each of the plurality of second detectors are acquired.In the notification step, in at least one of the following cases, a notification is made that a fire has occurred originating from a position between the first sensor and a third sensor located adjacent to the first sensor on the opposite side of the one second sensor among the plurality of second sensors: when the second temperature detected by the plurality of temperature detection units possessed by one second sensor exceeds the second temperature threshold; when the second gas concentration detected by the plurality of gas detection units possessed by the one second sensor exceeds the second gas threshold; and when the second smoke concentration detected by the smoke detection unit possessed by the one second sensor exceeds the second smoke threshold.

[0016] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a first detector among a plurality of detectors, the first detector including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold set therein, the first temperature threshold set therein, the first gas threshold set therein, the first gas threshold set therein, the first smoke concentration set therein, and the first gas concentration set therein. In the threshold setting step, when the first temperature detected by one of the plurality of temperature detection units included in the first sensor exceeds the first temperature threshold, the temperature thresholds of the plurality of temperature detection units included in a second sensor arranged adjacent to the first sensor on the side of the one of the plurality of sensor from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration threshold of the gas detection unit included in the second sensor is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit included in the second sensor is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperature detected by the plurality of temperature detection units included in the second sensor, the second gas concentration detected by the gas detection unit included in the second sensor, and the second smoke concentration of the smoke detected by the smoke detection unit included in the second sensor are acquired. In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred with its source located between the first detector and the second detector.

[0017] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a first detector among a plurality of detectors, the first detector including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold set therein, the first temperature threshold set therein, the first gas threshold set therein, the first gas threshold set therein, the first smoke concentration set therein, and the first gas concentration set therein. In the threshold setting step, when the first smoke concentration detected by the smoke detection unit of the first detector exceeds the first smoke threshold, and / or when the first gas concentration detected by the gas detection unit of the first detector exceeds the first gas threshold, the temperature threshold of the plurality of temperature detection units of a second detector among the plurality of detectors that is arranged adjacent to the first detector is changed from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold, the concentration threshold of the gas detection unit of the second detector is changed from the first gas threshold to a second gas threshold that is lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit of the second detector is changed from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units included in the second detector, a second gas concentration detected by the gas detection unit included in the second detector, and a second smoke concentration of smoke detected by the smoke detection unit included in the second detector are acquired. In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, or when the second smoke concentration exceeds the second smoke threshold, notification is made that a fire has occurred that originated at a position between the first detector and the second detector.

[0018] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a first detector among a plurality of detectors, the first detector including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold set therein, the first temperature threshold set therein, the first gas threshold set therein, the first gas threshold set therein, the first smoke concentration set therein, and the first gas concentration set therein. In the threshold setting step, when the first temperature detected by one of the plurality of temperature detecting units of the first sensor exceeds the first temperature threshold, the temperature thresholds of the plurality of temperature detecting units of a second sensor arranged adjacent to the first sensor on the opposite side of the one temperature detecting unit of the plurality of sensors are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the concentration threshold of the gas detecting unit of the second sensor is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detecting unit of the second sensor is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second obtaining step, the second temperature detected by the plurality of temperature detecting units of the second sensor, the second gas concentration detected by the gas detecting unit of the second sensor, and the second smoke concentration of the smoke detected by the smoke detecting unit of the second sensor are obtained. In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred with its source located between the first sensor and a third sensor located adjacent to the first sensor on the temperature detection unit side of one of the plurality of sensors.

[0019] A fire notification method according to one aspect of the present disclosure includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a first detector among a plurality of detectors, the first detector including a smoke detection unit having a first smoke threshold set therein, the first temperature threshold set therein, the first temperature threshold set therein, the first gas threshold set therein, the first gas threshold set therein, the first smoke concentration set therein, and the first gas concentration set therein. In the threshold setting step, when the first smoke concentration detected by the smoke detection unit of the first detector exceeds the first smoke threshold, and / or when the first gas concentration detected by the gas detection unit of the first detector exceeds the first gas threshold, the temperature thresholds of the temperature detection units of each of the second detectors arranged adjacent to the first detector among the plurality of detectors are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the gas detection units of each of the second detectors are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration thresholds of the smoke detection units of each of the second detectors are changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units possessed by each of the plurality of second sensors, a second gas concentration detected by the gas detection unit possessed by each of the plurality of second sensors, and a second smoke concentration of smoke detected by the smoke detection unit possessed by each of the plurality of second sensors are acquired.In the notification step, in at least one of the following cases, a notification is made that a fire has occurred originating from a position between the first sensor and a third sensor located adjacent to the first sensor on the opposite side of the one second sensor among the plurality of second sensors: when the second temperature detected by the plurality of temperature detection units possessed by one second sensor among the plurality of second sensors exceeds the second temperature threshold; when the second gas concentration detected by the gas detection unit possessed by the one second sensor exceeds the second gas threshold; and when the second smoke concentration detected by the smoke detection unit possessed by the one second sensor exceeds the second smoke threshold.

[0020] A program according to one aspect of the present disclosure is a program for causing one or more processors to execute the fire notification method.

[0021] A fire notification system according to one aspect of the present disclosure includes the one or more processors that execute the program.

[0022] A detector according to one aspect of the present disclosure is included in the plurality of detectors used in the fire notification method.

[0023] FIG. 1 is a block diagram of a fire notification system according to a first embodiment of the present disclosure. FIG. 2 is an external perspective view of a detector according to the first to third embodiments of the present disclosure. FIG. 3 is an exploded perspective view of the detector. FIG. 4 is a schematic top view of a target space in which the fire notification system according to the first embodiment of the present disclosure is installed. FIG. 5 is a flowchart for explaining the operation of the fire notification system according to the first to third embodiments of the present disclosure. FIG. 6 is a flowchart for explaining the operation of the fire notification system according to the first to third embodiments of the present disclosure. FIG. 7 is a flowchart for explaining the operation of the fire notification system according to the first to third embodiments of the present disclosure. FIG. 8 is a block diagram of fire notification systems according to the second and third embodiments of the present disclosure. FIG. 9 is a schematic top view of a target space in which the fire notification system according to the second embodiment of the present disclosure is installed. FIG. 10 is a schematic top view of a target space in which the fire notification system according to the third embodiment of the present disclosure is installed.

[0024] The fire notification method, the program, the fire notification system 100, 100A, 100B, and the detector E0 according to the embodiments of the present disclosure will be described in detail below. The fire notification method can be performed by the fire notification system 100, 100A, 100B shown in FIGS.

[0025] (Embodiment 1) A fire notification system 100 that executes a fire notification method according to embodiment 1 will be described in detail below with reference to the drawings. However, each diagram described in the following embodiments is a schematic diagram, and the dimensional ratios of the sizes of the components do not necessarily reflect the actual dimensional ratios. Furthermore, the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0026] (1) Configuration The configuration of the fire notification system 100 will be described in detail below with reference to the drawings.

[0027] The fire notification system 100 is used to detect the occurrence of a fire in a target space F2 (see FIG. 1 ) within a facility F1 such as a logistics warehouse. Note that the term “fire” in this disclosure is not limited to phenomena accompanied by ignition, but also includes precursor phenomena to ignition.

[0028] 1, the fire notification system 100 includes a plurality of detectors E0 and a fire notification device 200. That is, the plurality of detectors E0 are used in the fire notification method according to this embodiment.

[0029] (1.1) Detectors As shown in FIG. 2, a plurality of detectors E0 are arranged on a construction material C1 such as the ceiling of the target space F2.

[0030] As shown in Figures 2 and 3, the detector E0 comprises a housing 1, a smoke detection unit 2, a base 3, multiple temperature detection units 4, a control unit 5, a communication unit 6, a display unit 7, a flow path forming member 8, and a memory unit 9.

[0031] The housing 1 houses a smoke detection unit 2, a base 3, a plurality of temperature detection units 4, a control unit 5, a communication unit 6, a display unit 7, a flow path forming member 8, and a memory unit 9 inside.

[0032] The housing 1 is made of synthetic resin, for example, flame-retardant ABS resin. The housing 1 is formed as a whole in the shape of a cylinder that is flat in the vertical direction. As shown in FIG. 3 , the housing 1 has a cylindrical lower cover 1A with one open surface (the upper surface in the illustrated example) and a generally disk-shaped upper cover 1B. The housing 1 is constructed by assembling the upper cover 1B to the lower cover 1A from the open surface side. The upper cover 1B is arranged to cover the smoke detection unit 2 from above. The lower cover 1A is arranged below the base 3.

[0033] The housing 1 also has a plurality of (six in this embodiment) openings 1C (horizontal holes) that connect the internal space of the housing 1 with the external space. Here, the plurality of openings 1C are provided in the lower cover 1A.

[0034] The smoke detection unit 2 is disposed in the center of the internal space of the housing 1 and is configured to detect smoke. The smoke detection unit 2 is disposed above the base 3 via a flow path forming member 8, which will be described later. The smoke detection unit 2 is, for example, a photoelectric sensor that detects smoke, and in particular, a scattered light sensor. The smoke detection unit 2 detects smoke guided by the flow path forming member 8, which is made of, for example, flame-retardant ABS resin.

[0035] The smoke detection unit 2 includes a housing 20, an optical element that emits light, a light-receiving element that receives the light emitted from the optical element, and a labyrinth portion. The housing 20 is formed in a flat, approximately cylindrical shape and houses the optical element, the light-receiving element, and the labyrinth portion inside. The optical element is, for example, an LED (Light Emitting Diode), and the light-receiving element is, for example, a photodiode.

[0036] The housing 20 has a plurality of inlets 21 that allow smoke to flow into the labyrinth portion. Smoke flows into the labyrinth portion through the inlets 21. Each inlet 21 has a substantially rectangular opening when viewed from the front. The multiple inlets 21 are arranged side by side along the circumferential direction of the smoke detection unit 2 (housing 20). In this embodiment, the circumferential direction of the smoke detection unit 2 coincides with the circumferential direction of the sensor E0.

[0037] The optical element and the light-receiving element are arranged in the labyrinth section so as not to face each other. In the event of a fire or the like, smoke generated by the fire can enter the housing 1 through the opening 1C of the housing 1 and then be introduced into the labyrinth section through the inlet 21. When there is no smoke in the labyrinth section, almost no light emitted by the optical element reaches the light-receiving surface of the light-receiving element. On the other hand, when smoke is present in the labyrinth section, the light emitted by the optical element is scattered by the smoke, and some of the scattered light reaches the light-receiving surface of the light-receiving element. In other words, the smoke detection unit 2 receives the light emitted by the optical element that has been scattered by the smoke with the light-receiving element.

[0038] The smoke detection unit 2 is electrically connected to a control unit 5 mounted on the base 3. The smoke detection unit 2 transmits to the control unit 5 an electrical signal (detection signal) indicating the density of the detected smoke.

[0039] The base 3 is a circuit board formed in a substantially circular shape as shown in Fig. 3. The base 3 is, for example, a printed wiring board on which a conductor pattern wiring is provided.

[0040] The base 3 is equipped with a plurality of (six in this embodiment) temperature detection units 4, a communication unit 6, a display unit 7, a control unit 5, and a storage unit 9.

[0041] The six temperature detection units 4 are mounted at equal intervals in the circumferential direction on the peripheral edge of the base 3. The six temperature detection units 4 are arranged around the smoke detection unit 2 when viewed from above and below.

[0042] The temperature detection units 4 include temperature detection elements such as chip thermistors that detect the temperature of the gas that flows in through the openings 1C. The six temperature detection units 4 are arranged so as to face different openings 1C from each other.

[0043] The temperature detection units 4 are electrically connected to the control unit 5. Each temperature detection unit 4 outputs an electric signal (detection signal) to the control unit 5 indicating the detected temperature.

[0044] The communication unit 6 is configured to be able to communicate with the fire notification device 200. In this disclosure, "capable of communication" means that information can be exchanged directly or indirectly via the repeater R1 or the internal network NT1 using an appropriate communication method, such as wired or wireless communication. The internal network NT1 is a network such as a local area network (LAN) installed within the facility F1. In this embodiment, the communication unit 6 communicates with the repeater R1 using a wireless communication method and with the fire notification device 200 via the repeater R1 and the internal network NT1. In this embodiment, the communication unit 6 employs wireless communication using radio waves as a communication medium, in compliance with standards such as Wi-Fi (registered trademark), Bluetooth (registered trademark), ZigBee (registered trademark), or unlicensed low-power radio (specified low-power radio).

[0045] In this embodiment, multiple detectors E0 communicate with the fire notification device 200, but one of the multiple detectors E0 may be used as a parent device that communicates with the fire notification device 200, and the detectors E0 other than the parent device may communicate with the fire notification device 200 via the parent device.

[0046] The display unit 7 includes a light source and a lighting circuit for lighting the light source. Under normal circumstances (when monitoring for a fire), the display unit 7 turns off the light source under the control of the control unit 5. In the event of a fire, the display unit 7 starts flashing or lighting the light source under the control of the control unit 5.

[0047] The control unit 5 can be realized by, for example, a computer system including one or more processors (microprocessors) and one or more memories. In other words, the one or more processors execute one or more programs stored in one or more memories to function as the control unit 5. Here, the programs are pre-recorded in the memory of the control unit 5, but they may also be provided via a telecommunications line such as the Internet or by being recorded on a non-transitory recording medium such as a memory card.

[0048] The control unit 5 has an acquisition unit 51, a determination unit 52, a display control unit 53, and a signal generation unit 54. Note that these merely indicate functions realized by the control unit 5, and do not necessarily indicate actual configurations.

[0049] The acquisition unit 51 periodically acquires the temperatures detected by the plurality of temperature detection units 4 and the density of smoke detected by the smoke detection unit 2 .

[0050] The determination unit 52 periodically determines whether or not a fire has occurred based on the temperatures acquired by the acquisition unit 51 from the plurality of temperature detection units 4 and the smoke density acquired from the smoke detection unit 2. The determination unit 52 determines whether or not a fire has occurred, for example, every time the acquisition unit 51 acquires temperature and smoke density data from the plurality of temperature detection units 4 and the smoke detection unit 2, respectively. In other words, the determination unit 52 periodically determines whether or not a fire has occurred.

[0051] More specifically, the determination unit 52 compares the temperatures acquired from the plurality of temperature detection units 4 with a temperature threshold (temperature threshold). The determination unit 52 also compares the smoke density acquired from the smoke detection unit 2 with a smoke density threshold (smoke threshold). The determination unit 52 determines that a fire has occurred when at least one of the temperatures acquired from the plurality of temperature detection units 4 exceeds the temperature threshold and the smoke density acquired from the smoke detection unit 2 exceeds the smoke threshold.

[0052] When the determination unit 52 determines that a fire has occurred, the display control unit 53 controls the lighting circuit of the display unit 7 to blink or light the light source of the display unit 7 .

[0053] Furthermore, when the determination unit 52 determines that a fire has occurred, the signal generation unit 54 generates a signal (fire occurrence signal) notifying the occurrence of a fire and transmits it to the fire notification device 200 via the communication unit 6 .

[0054] The storage unit 9 is configured with a device selected from a ROM (Read Only Memory), a RAM (Random Access Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory), etc. The storage unit 9 stores a unique identification ID of the detector E0, a temperature threshold value and a smoke threshold value used by the control unit 5 to determine whether a fire has occurred, etc.

[0055] (1.2) Fire Notification Device The fire notification device 200 is realized by, for example, a server device.

[0056] The fire notification device 200 includes a first communication unit 201 , a second communication unit 202 , a memory unit 203 , and a control unit 204 .

[0057] The first communication unit 201 is configured to be able to communicate with the plurality of detectors E0 via the internal network NT1 and the repeater R1. The identification IDs of the plurality of detectors E0 arranged in the target space F2 are pre-registered in the memory unit 9 of the fire notification device 200, and the first communication unit 201 communicates with each detector E0 using the identification ID registered in the memory unit 9.

[0058] The second communication unit 202 is configured to be able to communicate with an information terminal 300 used by a manager or the like of facility F1. The information terminal 300 is, for example, a smartphone, a tablet terminal with a communication function, or a wearable terminal with a communication function. The information terminal 300 has, for example, a communication unit 301, a display unit 302 that displays images, and an audio output unit 303 that outputs audio. The communication unit 301, the display unit 302, and the audio output unit 303 are controlled by a control unit (not shown) included in the information terminal 300.

[0059] In this embodiment, the second communication unit 202 and the communication unit 301 of the information terminal 300 communicate indirectly via the external network NT2. The identification ID (network address, etc.) of the information terminal 300 is registered in advance in the memory unit 203 of the fire notification device 200, and the second communication unit 202 communicates indirectly with the information terminal 300 using the identification ID registered in the memory unit 203.

[0060] The storage unit 203 is configured by a device selected from a ROM, a RAM, an EEPROM, etc. The storage unit 203 stores the identification IDs of the multiple sensors E0, the identification ID of the information terminal 300, etc. The storage unit 203 also stores data indicating the arrangement positions of the multiple sensors E0 within the target space F2.

[0061] The control unit 204 can be realized by, for example, a computer system including one or more processors (microprocessors) and one or more memories. In other words, the one or more processors execute one or more programs stored in one or more memories to function as the control unit 204. Here, the programs are pre-recorded in the memory of the control unit 204 or in the storage unit 203, but they may also be provided via a telecommunications line such as the Internet or by being recorded on a non-transitory recording medium such as a memory card.

[0062] 1, the control unit 204 has a target selection unit 205, a threshold setting unit 206, and a notification unit 207. Note that these merely indicate functions realized by the control unit 204, and do not necessarily indicate actual configurations.

[0063] When the first communication unit 201 receives the fire occurrence signal, the threshold setting unit 206 changes the temperature thresholds of the multiple temperature detection units 4 of the multiple detectors E0 other than the detector E0 that transmitted the fire occurrence signal from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The first temperature threshold is a value that is initially set in the memory unit 9 of the detector E0, and is a temperature threshold that serves as a criterion for determining whether a fire has occurred based on the detection results of the multiple temperature detection units 4 by the determination unit 52. Specifically, the threshold setting unit 206 rewrites the first temperature thresholds stored in the memory units 9 of the detectors E0 other than the detector E0 that transmitted the fire occurrence signal to the second temperature threshold.

[0064] Furthermore, when the first communication unit 201 receives a fire occurrence signal, the threshold setting unit 206 changes the smoke threshold of the smoke detection unit 2 of each of the plurality of detectors E0 other than the detector E0 that transmitted the fire occurrence signal from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold. The first smoke threshold is a value that is initially set in the storage unit 9 and is a threshold of smoke concentration that serves as a criterion for determining whether a fire has occurred based on the detection result of the smoke detection unit 2 by the determination unit 52. Specifically, the threshold setting unit 206 rewrites the first smoke threshold stored in the storage unit 9 of each of the detectors E0 other than the detector E0 that transmitted the fire occurrence signal to the second smoke threshold.

[0065] The detector E0 for which the threshold setting unit 206 changes the temperature threshold and smoke threshold is selected by the target selection unit 205. The target selection unit 205 selects the detector E0 for which the threshold setting unit 206 changes the temperature threshold and smoke threshold, based on data indicating the arrangement positions of the multiple detectors E0 within the target space F2 stored in the memory unit 203.

[0066] The function of the notification unit 207 will be explained in detail in "(3) Example of operation of the fire notification system."

[0067] (2) Example of Operation of Fire Notification System According to First Embodiment An example of operation of the fire notification system 100 according to the first embodiment will be described below with reference to FIG. 1 and FIGS. 4 to 7. FIG.

[0068] First, as shown in FIG. 4 , assume that multiple sensors E0 are arranged in the target space F2 at equal intervals along the X axis and the Y axis intersecting the X axis. FIG. 4 is a schematic diagram of a portion of the target space F2 viewed from above, and for the sake of explanation, the distance between the multiple sensors E0 is drawn narrower than it actually is. Here, the X axis represents, for example, an east-west direction, with the positive direction of the X axis representing east and the negative direction of the X axis representing west. The positive direction of the Y axis represents north and the negative direction of the Y axis represents south. Note that this definition of directions is merely an example and does not limit the arrangement of the multiple sensors E0. Furthermore, the number of sensors E0 arranged in the target space F2 is not limited to the number shown in FIG. 4 .

[0069] In the following explanation, the one sensor E0 located in the center of Figure 4 will be referred to as sensor E1, and the eight sensors E0 located around sensor E1 will be referred to as sensor E2, sensor E3, sensor E4, sensor E5, sensor E6, sensor E7, sensor E8, and sensor E9 in a clockwise direction, starting from sensor E0 located to the east of sensor E1.

[0070] The sensors E2 and E6 face each other via the sensor E1. The sensors E3 and E7 face each other via the sensor E1. The sensors E4 and E8 face each other via the sensor E1. The sensors E5 and E9 face each other via the sensor E1.

[0071] 4, the three sensors E0 located at the western end are called sensors E10, E11, and E12, respectively, from the south side. Sensors E1, E4, E5, E10, E11, E12, E7, and E8 are arranged around sensor E6. Specifically, sensor E1 is arranged to the east of sensor E6, and sensors E1, E4, E5, E10, E11, E12, E7, and E8 are arranged clockwise around sensor E6.

[0072] 4, for the sake of explanation, the smoke detection unit 2 and six temperature detection units 4 of the sensor E0 are visualized. Here, the six temperature detection units 4 of the sensor E0 are arranged at equal intervals in the circumferential direction around the smoke detection unit 2. The sensor E0 is arranged such that two of the six temperature detection units 4, which face each other, are aligned in the east-west direction. Here, in the following explanation, the six temperature detection units 4 are referred to in clockwise order, starting from the temperature detection unit 4 on the east side of the smoke detection unit 2, as the first temperature detection unit 41, the second temperature detection unit 42, the third temperature detection unit 43, the fourth temperature detection unit 44, the fifth temperature detection unit 45, and the sixth temperature detection unit 46.

[0073] (2.1) First Operation Example A first operation example of the fire notification system 100 will be described with reference to the flowchart in Fig. 5. In the first operation example, it is assumed that no airflow is occurring within the target space F2.

[0074] First, at a certain point in time (first point in time), an acquisition unit 51 included in each of the plurality of detectors E0 including detectors E1 to E12 acquires the temperatures detected by the plurality of temperature detection units 4 included in each detector E0 and the smoke density detected by the smoke detection unit 2 included in each detector E0. Also, at the first point in time, a determination unit 52 included in each of the plurality of detectors E0 determines whether or not a fire has occurred based on the temperatures and smoke density acquired by the acquisition unit 51 included in each detector E0.

[0075] Here, it is assumed that the detector E1 detects the occurrence of a fire at a first time point (step ST1). That is, it is assumed that the determination unit 52 of the detector E1 determines that a fire has occurred at the first time point. In the following description, the detector E1 that determines that a fire has occurred at the first time point may be referred to as the first detector E1.

[0076] More specifically, the determination unit 52 of the first sensor E1 determines that a fire has occurred when the first temperature detected by the first temperature detection unit 41 of the six temperature detection units 4 of the first sensor E1 exceeds the first temperature threshold. At this time, the signal generation unit 54 generates a fire occurrence signal (first fire occurrence signal) indicating that the first temperature detected by the first temperature detection unit 41 of the first sensor E1 has exceeded the first temperature threshold, and transmits the signal to the fire notification device 200 (step ST2).

[0077] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from the plurality of detectors E0, a detector E0 that is located adjacent to the first detector E1 on the first temperature detection unit 41 side. Specifically, the target selection unit 205 selects, from the plurality of detectors E0, detectors E2 to E9 that are located adjacent to the first detector E1 around the first detector E1. Furthermore, the target selection unit 205 selects, from the detectors E2 to E9, a detector E0 that is located adjacent to the first detector E1 on the first temperature detection unit 41 side (east side). Here, in this embodiment, the target selection unit 205 selects, from the detectors E2 to E9, detectors E2, E3, and E9 that are located adjacent to the first detector E1 on the east side of the first detector E1 as the "detector E0 located adjacent to the first detector E1 on the first temperature detection unit 41 side (east side)" (step ST3). The target selection unit 205 may select only the sensor E2 that is the sensor E0 that is located adjacent to the first sensor E1 on the east side as viewed from the first sensor E1 as the "sensor E0 that is located adjacent to the first sensor E1 on the first temperature detection unit 41 side (east side)." In the following description, the sensors E2, E3, and E9 selected by the target selection unit 205 may be referred to as the second sensors E2, E3, and E9, respectively.

[0078] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors E2, E3, and E9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second detectors E2, E3, and E9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST4). That is, the determination units 52 of the second detectors E2, E3, and E9 can more easily determine that a fire has occurred after the first time point.

[0079] Next, at a second time point that is later than the first time point, the acquisition unit 51 included in each of the plurality of detectors E0 including detectors E1 to E12 acquires the temperatures detected by the plurality of temperature detection units 4 included in each detector E0 and the smoke density detected by the smoke detection unit 2 included in each detector E0. Also, at the second time point, the determination unit 52 included in each of the plurality of detectors E0 determines whether or not a fire has occurred based on the temperatures and smoke density acquired by the acquisition unit 51 included in each detector E0.

[0080] Here, assume that at a second time point, the second sensor E2 of the second sensors E2, E3, and E9 detects the occurrence of a fire (step ST5). That is, assume that at the second time point, the determination unit 52 of the second sensor E2 determines that a fire has occurred. As an example, assume that the determination unit 52 of the second sensor E2 determines that a fire has occurred because the temperature (second temperature) detected by the fourth temperature detection unit 44 of the six temperature detection units 4 of the second sensor E2 exceeds the second temperature threshold. At this time, the signal generation unit 54 generates a fire occurrence signal (second fire occurrence signal) indicating that the second temperature detected by the fourth temperature detection unit 44 of the second sensor E2 has exceeded the second temperature threshold, and transmits the signal to the fire notification device 200 (step ST6). The determination unit 52 of the second sensor E2 may determine that a fire has occurred when the smoke density (second smoke density) detected by the smoke detection unit 2 of the second sensor E2 exceeds the second smoke threshold. In this case, the second fire occurrence signal indicates that the second smoke density detected by the smoke detection unit 2 of the second sensor E2 has exceeded the second smoke threshold. The determination unit 52 of the second sensor E2 may also determine that a fire has occurred when both the second temperature has exceeded the second temperature threshold and the second smoke density has exceeded the second smoke threshold. In this case, the second fire occurrence signal indicates that the second temperature has exceeded the second temperature threshold and that the second smoke density has exceeded the second smoke threshold.

[0081] When the notification unit 207 of the fire notification device 200 receives the second fire occurrence signal, it generates a notification signal notifying that a fire has occurred with its origin located between the first detector E1 and the second detector E2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST7). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector E1 and the second detector E2 when at least one of the following cases is true: the second temperature exceeds the second temperature threshold and the second smoke density exceeds the second smoke threshold.

[0082] When the information terminal 300 receives the notification signal, it causes the display unit 302 to display an image notifying that a fire has broken out with its origin located between the first sensor E1 and the second sensor E2, based on the notification signal. Also, when the information terminal 300 receives the notification signal, it causes the audio output unit 303 to output audio notifying that a fire has broken out with its origin located between the first sensor E1 and the second sensor E2, based on the notification signal.

[0083] In this way, when no airflow is occurring in the target space F2, the other detector E0 located on the first temperature detection unit 41 side of the first detector E1 that first detected the fire is likely to be the next to detect the fire. Therefore, by making it easier for the detector E0 located adjacent to the first detector E1 on the first temperature detection unit 41 side to detect the fire, the location of the source of the fire can be estimated.

[0084] In this way, when no airflow is occurring in the target space F2, it is highly likely that the detector E0, which is located on the first temperature detection unit 41 side of the first detector E1 that first detected the fire, will be the next to detect the fire. Therefore, by making it easier for the detector E0, which is located adjacent to the first detector E1 on the first temperature detection unit 41 side of the first detector E1, to detect the fire, it is possible to estimate the location of the source of the fire.

[0085] (2.2) Second Operation Example A second operation example of the fire notification system 100 will be described with reference to the flowchart in Fig. 5. In the second operation example, it is assumed that no airflow is occurring within the target space F2.

[0086] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors E0 including detectors E1 to E12 acquires the temperatures detected by the plurality of temperature detection units 4 included in each detector E0 and the smoke density detected by the smoke detection unit 2 included in each detector E0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors E0 determines whether or not a fire has occurred based on the temperatures and smoke density acquired by the acquisition unit 51 included in each detector E0.

[0087] Here, it is assumed that the detector E1 detects the occurrence of a fire at a first time point (step ST1). That is, it is assumed that the determination unit 52 of the detector E1 determines that a fire has occurred at the first time point. In the following description, the detector E1 that determines that a fire has occurred at the first time point may be referred to as the first detector E1.

[0088] More specifically, the determination unit 52 of the first detector E1 determines that a fire has occurred when the first smoke density detected by the smoke detection unit 2 of the first detector E1 exceeds the first smoke threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first smoke density detected by the smoke detection unit 2 of the first detector E1 has exceeded the first smoke threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST2).

[0089] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from among the multiple detectors E0, detectors E2 to E9 that are located adjacent to the first detector E1 around the first detector E1 (step ST3). Note that in the following description, the detectors E2 to E9 selected by the target selection unit 205 may be referred to as second detectors E2 to E9, respectively.

[0090] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second sensors E2 to E9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second sensors E2 to E9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST4).

[0091] Next, at a second time point that is later than the first time point, the acquisition unit 51 included in each of the plurality of detectors E0 including detectors E1 to E12 acquires the temperatures detected by the plurality of temperature detection units 4 included in each detector E0 and the smoke density detected by the smoke detection unit 2 included in each detector E0. Also, at the second time point, the determination unit 52 included in each of the plurality of detectors E0 determines whether or not a fire has occurred based on the temperatures and smoke density acquired by the acquisition unit 51 included in each detector E0.

[0092] Here, it is assumed that, at a second time point, the second detector E2 among the second detectors E2 to E9 detects the occurrence of a fire (step ST5). That is, it is assumed that, at the second time point, the determination unit 52 of the second detector E2 determines that a fire has occurred. As an example, it is assumed that the determination unit 52 of the second detector E2 determines that a fire has occurred when the second smoke density detected by the smoke detection unit 2 of the second detector E2 exceeds the second smoke threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second smoke density detected by the smoke detection unit 2 of the second detector E2 has exceeded the second smoke threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST6). It is noted that the determination unit 52 of the second detector E2 may also determine that a fire has occurred when the second temperature detected by at least one of the six temperature detection units 4 of the second detector E2 exceeds the second temperature threshold. In this case, the second fire occurrence signal indicates that the second temperature detected by at least one of the six temperature detection units 4 of the second sensor E2 has exceeded the second temperature threshold. Alternatively, the determination unit 52 of the second sensor E2 may determine that a fire has occurred based on both the second temperature exceeding the second temperature threshold and the second smoke density exceeding the second smoke threshold. In this case, the second fire occurrence signal indicates that the second temperature has exceeded the second temperature threshold and that the second smoke density has exceeded the second smoke threshold.

[0093] When the notification unit 207 of the fire notification device 200 receives the second fire occurrence signal, it generates a notification signal notifying that a fire has occurred with its origin located between the first detector E1 and the second detector E2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST7). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector E1 and the second detector E2 when at least one of the following cases is true: the second temperature exceeds the second temperature threshold and the second smoke density exceeds the second smoke threshold.

[0094] When the information terminal 300 receives the notification signal, it causes the display unit 302 to display an image notifying that a fire has broken out with its origin located between the first sensor E1 and the second sensor E2, based on the notification signal. Also, when the information terminal 300 receives the notification signal, it causes the audio output unit 303 to output audio notifying that a fire has broken out with its origin located between the first sensor E1 and the second sensor E2, based on the notification signal.

[0095] In this way, since the detector E0 located around the first detector E1 that first detected the fire is likely to be the next to detect the fire, by making it easier for the detector E0 located around the first detector E1 to detect the fire, the location of the source of the fire can be estimated.

[0096] (2.3) Third Operation Example A third operation example of the fire notification system 100 will be described with reference to the flowchart in Figure 6. In the third operation example, it is assumed that an air current is generated within the target space F2 by an air conditioning device such as an air conditioner. Therefore, the air whose temperature has risen due to a fire that has broken out within the target space F2 and the smoke generated by the fire move within the target space F2 on the air current.

[0097] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors E0 including detectors E1 to E12 acquires the temperatures detected by the plurality of temperature detection units 4 included in each detector E0 and the smoke density detected by the smoke detection unit 2 included in each detector E0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors E0 determines whether or not a fire has occurred based on the temperatures and smoke density acquired by the acquisition unit 51 included in each detector E0.

[0098] Here, it is assumed that the detector E1 detects the occurrence of a fire at a first time point (step ST11). That is, it is assumed that the determination unit 52 of the detector E1 determines that a fire has occurred at the first time point. In the following description, the detector E1 that determines that a fire has occurred at the first time point may be referred to as the first detector E1.

[0099] More specifically, the determination unit 52 of the first sensor E1 determines that a fire has occurred when the first temperature detected by the first temperature detection unit 41 of the six temperature detection units 4 of the first sensor E1 exceeds the first temperature threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first temperature detected by the first temperature detection unit 41 of the first sensor E1 has exceeded the first temperature threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST12).

[0100] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from the plurality of detectors E0, a detector E0 that is adjacent to the first detector E1 on the opposite side of the first temperature detection unit 41. Specifically, the target selection unit 205 selects, from the plurality of detectors E0, detectors E2 to E9 that are adjacent to the first detector E1 around the first detector E1. Furthermore, the target selection unit 205 selects, from the detectors E2 to E9, a detector E0 that is adjacent to the first detector E1 on the opposite side (west side) of the first temperature detection unit 41. Here, in this embodiment, the target selection unit 205 selects, from the detectors E2 to E9, detectors E5, E6, and E7 that are adjacent to the first detector E1 and are located west of the first detector E1, as the "detector E0 that is adjacent to the first detector E1 on the opposite side (west side) of the first temperature detection unit 41" (step ST13). The target selection unit 205 may select only the sensor E6, which is the sensor E0 arranged adjacent to the first sensor E1 on the west side as viewed from the first sensor E1, as the "sensor E0 arranged adjacent to the first sensor E1 on the opposite side (west side) from the first temperature detection unit 41." In the following description, the sensors E5, E6, and E7 selected by the target selection unit 205 may be referred to as second sensors E5, E6, and E7, respectively.

[0101] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second sensors E5, E6, and E7 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second sensors E5, E6, and E7 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST14).

[0102] Next, at a second time point that is later than the first time point, the acquisition unit 51 included in each of the plurality of detectors E0 including detectors E1 to E12 acquires the temperatures detected by the plurality of temperature detection units 4 included in each detector E0 and the smoke density detected by the smoke detection unit 2 included in each detector E0. Also, at the second time point, the determination unit 52 included in each of the plurality of detectors E0 determines whether or not a fire has occurred based on the temperatures and smoke density acquired by the acquisition unit 51 included in each detector E0.

[0103] Here, assume that at a second time point, the second detector E6 among the second detectors E5, E6, and E7 detects the occurrence of a fire (step ST15). That is, assume that at the second time point, the determination unit 52 of the second detector E6 determines that a fire has occurred. As an example, assume that the determination unit 52 of the second detector E6 determines that a fire has occurred when the second temperature detected by the first detector 41 of the six detectors 4 included in the second detector E6 exceeds the second temperature threshold. At this time, the signal generator 54 generates a second fire occurrence signal indicating that the second temperature detected by the first detector 41 of the second detector E6 has exceeded the second temperature threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST16). Note that the determination unit 52 of the second detector E6 may also determine that a fire has occurred when the second smoke density detected by the smoke detector 2 included in the second detector E6 exceeds the second smoke threshold. In this case, the second fire occurrence signal indicates that the second smoke density detected by the smoke detection unit 2 of the second sensor E6 has exceeded the second smoke threshold. The determination unit 52 of the second sensor E6 may also determine that a fire has occurred based on both the second temperature exceeding the second temperature threshold and the second smoke density exceeding the second smoke threshold. In this case, the second fire occurrence signal indicates that the second temperature has exceeded the second temperature threshold and that the second smoke density has exceeded the second smoke threshold.

[0104] When the target selection unit 205 of the fire notification device 200 receives the second fire occurrence signal, it selects, from the multiple detectors E0, a detector E0 that is arranged adjacent to the first detector E1 on the side of the first temperature detection unit 41. Specifically, the target selection unit 205 selects, from the detectors E2 to E9, a detector E0 that is arranged adjacent to the first detector E1 on the side (east) of the first temperature detection unit 41. Here, in the present embodiment, the target selection unit 205 selects, from the detectors E2 to E9, detectors E2, E3, and E9 that are detectors E0 that are arranged adjacent to the first detector E1 on the east side of the first detector E1 as the "detector E0 that is arranged adjacent to the first detector E1 on the side (east) of the first temperature detection unit 41." The target selection unit 205 may select only the sensor E2 that is the sensor E0 that is located adjacent to the first sensor E1 on the east side as viewed from the first sensor E1 as the "sensor E0 that is located adjacent to the first sensor E1 on the first temperature detection unit 41 side (east side)." In the following description, the second sensors E2, E3, and E9 selected by the target selection unit 205 may be referred to as the third sensors E2, E3, and E9, respectively.

[0105] Furthermore, the target selection unit 205 selects the third sensor E2 from among the third sensors E2, E3, and E9, which is opposite the second sensor E6 that detected the occurrence of the fire via the first sensor E1 (step ST17).

[0106] When the target selection unit 205 selects the third detector E2, the notification unit 207 of the fire notification device 200 generates a notification signal notifying that a fire has occurred with its origin located between the first detector E1 and the third detector E2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST18). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector E1 and the third detector E2 when at least one of the following cases occurs: the second temperature exceeds the second temperature threshold and the second smoke density exceeds the second smoke threshold.

[0107] When the information terminal 300 receives the notification signal, it causes the display unit 302 to display an image notifying that a fire has broken out with its origin located between the first sensor E1 and the third sensor E2, based on the notification signal. Also, when the information terminal 300 receives the notification signal, it causes the audio output unit 303 to output audio notifying that a fire has broken out with its origin located between the first sensor E1 and the second sensor E3, based on the notification signal.

[0108] In this way, when an air current is occurring in the target space F2, it is highly likely that the detector E0 located on the opposite side of the first temperature detection unit 41 of the first detector E1 that first detected the fire will be the next to detect the fire. Therefore, by making it easier for the detector E0 located adjacent to the first detector E1 on the opposite side of the first temperature detection unit 41 of the first detector E1 to detect the fire, it is possible to estimate the location of the source of the fire.

[0109] (2.4) Fourth Operation Example A fourth operation example of the fire notification system 100 will be described with reference to the flowchart in FIG. 7. In the fourth operation example, it is assumed that an air current is generated within the target space F2 by an air conditioning device such as an air conditioner. Therefore, the air whose temperature has risen due to a fire that has broken out within the target space F2 and the smoke generated by the fire move within the target space F2 on the air current.

[0110] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors E0 including detectors E1 to E12 acquires the temperatures detected by the plurality of temperature detection units 4 included in each detector E0 and the smoke density detected by the smoke detection unit 2 included in each detector E0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors E0 determines whether or not a fire has occurred based on the temperatures and smoke density acquired by the acquisition unit 51 included in each detector E0.

[0111] Here, it is assumed that the first detector E1 detects the occurrence of a fire at a first time point (step ST21). That is, it is assumed that the determination unit 52 of the detector E1 determines that a fire has occurred at the first time point. In the following description, the detector E1 that determines that a fire has occurred at the first time point may be referred to as the first detector E1.

[0112] More specifically, the determination unit 52 of the first detector E1 determines that a fire has occurred when the first smoke density detected by the smoke detection unit 2 of the first detector E1 exceeds the first smoke threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first smoke density detected by the smoke detection unit 2 of the first detector E1 has exceeded the first smoke threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST22).

[0113] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from among the multiple detectors E0, detectors E2 to E9 that are located adjacent to the first detector E1 around the first detector E1 (step ST23). Note that in the following description, the detectors E2 to E9 selected by the target selection unit 205 may be referred to as second detectors E2 to E9, respectively.

[0114] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second sensors E2 to E9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second sensors E2 to E9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST24).

[0115] Next, at a second time point that is later than the first time point, the acquisition unit 51 included in each of the plurality of detectors E0 including detectors E1 to E12 acquires the temperatures detected by the plurality of temperature detection units 4 included in each detector E0 and the smoke density detected by the smoke detection unit 2 included in each detector E0. Also, at the second time point, the determination unit 52 included in each of the plurality of detectors E0 determines whether or not a fire has occurred based on the temperatures and smoke density acquired by the acquisition unit 51 included in each detector E0.

[0116] Here, suppose that at a second time point, the second detector E6 among the second detectors E2 to E9 detects the occurrence of a fire (step ST25). That is, suppose that at the second time point, the determination unit 52 of the second detector E6 determines that a fire has occurred. As an example, suppose that the determination unit 52 of the second detector E6 determines that a fire has occurred when the second smoke density detected by the smoke detection unit 2 of the second detector E6 exceeds the second smoke threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second smoke density detected by the smoke detection unit 2 of the second detector E6 has exceeded the second smoke threshold, and transmits the signal to the fire notification device 200 (step ST26). Note that the determination unit 52 of the second detector E6 may also determine that a fire has occurred when the second temperature detected by at least one of the six temperature detection units 4 of the second detector E6 exceeds the second temperature threshold. In this case, the second fire occurrence signal indicates that the second temperature detected by at least one of the six temperature detection units 4 of the second sensor E6 has exceeded the second temperature threshold. Alternatively, the determination unit 52 of the second sensor E6 may determine that a fire has occurred based on both the second temperature exceeding the second temperature threshold and the second smoke density exceeding the second smoke threshold. In this case, the second fire occurrence signal indicates that the second temperature has exceeded the second temperature threshold and that the second smoke density has exceeded the second smoke threshold.

[0117] When the target selection unit 205 of the fire notification device 200 receives the second fire occurrence signal, it selects, from the multiple detectors E0, a detector E0 that is adjacent to the first detector E1 on the opposite side (east side) from the second detector E6. Here, in this embodiment, the target selection unit 205 selects, from the multiple detectors E0, detectors E2, E3, and E9 that are adjacent to the first detector E0 on the east side of the first detector E1 as the "detector E0 that is adjacent to the first detector E1 on the opposite side (east side) from the second detector E6." Note that the target selection unit 205 may select only detector E2 that is adjacent to the first detector E1 on the east side of the first detector E1 as the "detector E0 that is adjacent to the first detector E1 on the opposite side (east side) from the second detector E6." In the following description, the second sensors E2, E3, and E9 selected by the target selection unit 205 may be referred to as third sensors E2, E3, and E9, respectively.

[0118] Furthermore, the target selection unit 205 selects the third sensor E2 from among the third sensors E2, E3, and E9, which is opposite the second sensor E6 that detected the occurrence of the fire via the first sensor E1 (step ST27).

[0119] When the target selection unit 205 selects the third detector E2, the notification unit 207 of the fire notification device 200 generates a notification signal notifying that a fire has occurred with its origin located between the first detector E1 and the third detector E2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST28). That is, when the second temperature exceeds the second temperature threshold and / or when the second smoke density exceeds the second smoke threshold, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector E1 and the third detector E2.

[0120] When the information terminal 300 receives the notification signal, it causes the display unit 302 to display an image notifying that a fire has broken out with its origin located between the first sensor E1 and the third sensor E2, based on the notification signal. Also, when the information terminal 300 receives the notification signal, it causes the audio output unit 303 to output audio notifying that a fire has broken out with its origin located between the first sensor E1 and the third sensor E2, based on the notification signal.

[0121] Furthermore, upon receiving the second fire signal, the target selection unit 205 of the fire notification device 200 selects, from the plurality of detectors E0, a detector E0 adjacent to the second detector E6 other than the first detector E1. Specifically, the target selection unit 205 selects, from the plurality of detectors E0, detectors E4, E5, E7, E8, E10, E11, and E12, which are detectors E0 other than the detector E1 located adjacent to the second detector E6, around the second detector E6 (step ST29). Note that in the following description, the detectors E4, E5, E7, E8, E10, E11, and E12 selected by the target selection unit 205 may be referred to as fourth detectors E4, E5, E7, E8, E10, E11, and E12, respectively.

[0122] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the fourth sensors E4, E5, E7, E8, E10, E11, and E12 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the smoke concentration thresholds of the smoke detection units 2 of the fourth sensors E4, E5, E7, E8, E10, E11, and E12 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST30). In other words, the determination units 52 of the fourth sensors E4, E5, E7, E8, E10, E11, and E12 can more easily determine that a fire has occurred after the second time point.

[0123] In this way, since the detector E0 located around the first detector E1 that first detected the fire is likely to be the next to detect the fire, by making it easier for the detector E0 located around the first detector E1 to detect the fire, the location of the source of the fire can be estimated.

[0124] Furthermore, by making it easier for a detector E0 adjacent to a detector E0 that detected a fire after the first detector E1, other than the first detector E1, to detect a fire, it becomes easier to identify the direction of travel of the air whose temperature has risen due to the fire and the smoke generated by the fire.

[0125] (Embodiment 2) Hereinafter, a fire notification system 100A that executes a fire notification method according to embodiment 2 will be described in detail with reference to the drawings. Note that, with regard to the fire notification system 100A, components similar to those of the fire notification system 100 that executes the fire notification method according to embodiment 1 will be assigned the same reference numerals and descriptions thereof will be omitted.

[0126] (1) Configuration The configuration of the fire notification system 100A will be described in detail below with reference to the drawings.

[0127] 8, the fire notification system 100A includes a plurality of detectors Ea0 and a fire notification device 200. That is, the plurality of detectors Ea0 are used in the fire notification method according to this embodiment.

[0128] (1.1) Sensor The sensor Ea0 includes the same configuration as the sensor E0 in the first embodiment, and further includes a plurality of gas detection units 10 (four in this embodiment) as shown in FIGS.

[0129] The four gas detection units 10 are installed, for example, at equal intervals on the lower surface of the upper cover 1B of the housing 1.

[0130] The four gas detection units 10 are arranged around the smoke detection unit 2 when viewed from above and below.

[0131] The gas detection unit 10 detects the concentration of a specific gas (carbon monoxide gas in this embodiment) contained in the gas flowing in through the opening 1C. The gas detection unit 10 is an electrochemical sensor that includes, for example, a sensing electrode equipped with a catalyst, a counter electrode facing the sensing electrode, and an ion conductor sandwiched between the sensing electrode and the counter electrode. This sensor is configured so that charge transfer occurs between the sensing electrode and the counter electrode when water vapor and carbon monoxide in the air react with the catalyst in the sensing electrode.

[0132] The gas detection unit 10 is electrically connected to the control unit 5 mounted on the base 3. The gas detection unit 10 transmits to the control unit 5 an electrical signal (detection signal) indicating the concentration of the detected gas.

[0133] The acquisition unit 51 of the control unit 5 periodically acquires the temperatures detected by the plurality of temperature detection units 4, the smoke concentration detected by the smoke detection unit 2, and the gas concentration detected by the plurality of gas detection units 10.

[0134] The determination unit 52 of the control unit 5 periodically determines whether or not a fire has occurred based on the temperatures acquired by the acquisition unit 51 from the plurality of temperature detection units 4, the smoke concentration acquired from the smoke detection unit 2, and the gas concentration acquired from the plurality of gas detection units 10. The determination unit 52 determines whether or not a fire has occurred, for example, each time the acquisition unit 51 acquires temperature, smoke concentration, and gas concentration data from the plurality of temperature detection units 4, the smoke detection unit 2, and the plurality of gas detection units 10, respectively. In other words, the determination unit 52 periodically determines whether or not a fire has occurred.

[0135] More specifically, the determination unit 52 compares the temperatures acquired from the plurality of temperature detection units 4 with a temperature threshold (temperature threshold). The determination unit 52 also compares the smoke concentration acquired from the smoke detection unit 2 with a smoke concentration threshold (smoke threshold). The determination unit 52 also compares the gas concentrations acquired from the plurality of gas detection units 10 with a gas concentration threshold (gas threshold). The determination unit 52 determines that a fire has occurred in at least one of the following cases: when the temperatures acquired from the plurality of temperature detection units 4 exceed the temperature threshold; when the smoke concentration acquired from the smoke detection unit 2 exceeds the smoke threshold; and when the gas concentrations acquired from the plurality of gas detection units 10 exceed the gas threshold.

[0136] The memory unit 9 stores a unique identification ID of the detector Ea0, a temperature threshold, a smoke threshold, a gas threshold, and the like used by the control unit 5 to determine whether a fire has occurred.

[0137] (1.2) Fire notification device When the first communication unit 201 receives a fire occurrence signal, the threshold setting unit 206 of the control unit 204 provided in the fire notification device 200 changes the temperature thresholds of the multiple temperature detection units 4 of the multiple detectors Ea0 other than the detector Ea0 that transmitted the fire occurrence signal from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold.

[0138] In addition, when the first communication unit 201 receives a fire occurrence signal, the threshold setting unit 206 changes the smoke threshold of the smoke detection unit 2 of each of the multiple detectors Ea0 other than the detector Ea0 that transmitted the fire occurrence signal from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold.

[0139] Furthermore, when the first communication unit 201 receives the fire occurrence signal, the threshold setting unit 206 changes the gas thresholds of the multiple gas detection units 10 of the multiple detectors Ea0 other than the detector Ea0 that transmitted the fire occurrence signal from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The first gas threshold is a value that is initially set in the memory unit 9 and is a temperature threshold that serves as a criterion for determining whether a fire has occurred based on the detection results of the multiple gas detection units 10 by the determination unit 52. Specifically, the threshold setting unit 206 rewrites the first gas threshold stored in the memory unit 9 of the detectors Ea0 other than the detector Ea0 that transmitted the fire occurrence signal to the second gas threshold.

[0140] The detector Ea0 for which the threshold setting unit 206 will change the temperature threshold, smoke threshold, and gas threshold is selected by the target selection unit 205. The target selection unit 205 selects the detector Ea0 for which the threshold setting unit 206 will change the temperature threshold, smoke threshold, and gas threshold, based on data indicating the arrangement positions of the multiple detectors Ea0 within the target space F2 stored in the memory unit 203.

[0141] (2) Example of Operation of Fire Notification System According to Second Embodiment An example of operation of the fire notification system 100A according to the second embodiment will be described below with reference to FIGS.

[0142] In the following description, it is assumed that the arrangement of the 12 sensors Ea0 (Ea1 to Ea12) shown in FIG. 9 is the same as the arrangement of the sensors E1 to E12 in the first embodiment.

[0143] 9, for the sake of explanation, the smoke detection unit 2, six temperature detection units 4, and four gas detection units 10 of the sensor Ea0 are visualized. Here, the six temperature detection units 4 of the sensor Ea0 are arranged at equal intervals from one another in the circumferential direction around the smoke detection unit 2. The sensor Ea0 is arranged so that two of the six temperature detection units 4 that face each other are aligned in the east-west direction. The four gas detection units 10 of the sensor Ea0 are arranged at equal intervals from one another in the circumferential direction around the smoke detection unit 2. The sensor Ea0 is arranged so that two of the four gas detection units 10 are aligned in the east-west direction and the remaining two gas detection units 10 are aligned in the north-south direction. In the following description, the four gas detection units 10 will be referred to as the first gas detection unit 101, the second gas detection unit 102, the third gas detection unit 103, and the fourth gas detection unit 104, in that order clockwise from the temperature detection unit 4 on the east side of the smoke detection unit 2.

[0144] (2.1) First Operation Example A first operation example of the fire notification system 100A will be described with reference to the flowchart in Fig. 5. In the first operation example, it is assumed that no airflow is occurring within the target space F2.

[0145] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0146] Here, it is assumed that the detector Ea1 detects the occurrence of a fire at a first time point (step ST1). That is, it is assumed that the determination unit 52 of the detector Ea1 determines that a fire has occurred at the first time point. In the following description, the detector Ea1 that determines that a fire has occurred at the first time point may be referred to as the first detector Ea1.

[0147] More specifically, the determination unit 52 of the first sensor Ea1 determines that a fire has occurred when the first temperature detected by the first temperature detection unit 41 of the six temperature detection units 4 of the first sensor Ea1 exceeds the first temperature threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first temperature detected by the first temperature detection unit 41 of the first sensor Ea1 has exceeded the first temperature threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST2).

[0148] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from the multiple detectors Ea0, the detector Ea0 that is located adjacent to the first detector Ea1 on the side of the first temperature detection unit 41. Specifically, the target selection unit 205 selects, from the multiple detectors Ea0, detectors Ea2 to Ea9 that are located adjacent to the first detector Ea1 around the first detector Ea1. Furthermore, from the detectors Ea2 to Ea9, the target selection unit 205 selects the detector Ea0 that is located adjacent to the first detector Ea1 on the side (east) of the first temperature detection unit 41. In this embodiment, the target selection unit 205 selects, as the "sensor Ea0 located adjacent to the first sensor Ea1 on the first temperature detection unit 41 side (east side)," sensors Ea2, Ea3, and Ea9, which are sensors Ea0 located adjacent to the first sensor Ea1 on the east side of the first sensor Ea1, from among the sensors Ea2 to Ea9 (step ST3). Note that the target selection unit 205 may select only sensor Ea2, which is a sensor Ea0 located adjacent to the first sensor Ea1 on the east side of the first sensor Ea1, as the "sensor Ea0 located adjacent to the first sensor Ea1 on the first temperature detection unit 41 side (east side)." In the following description, the sensors Ea2, Ea3, and Ea9 selected by the target selection unit 205 may be referred to as second sensors Ea2, Ea3, and Ea9, respectively.

[0149] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Ea2, Ea3, and Ea9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the four gas detection units 10 of the second detectors Ea2, Ea3, and Ea9 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second detectors Ea2, Ea3, and Ea9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST4). In other words, the determination units 52 of the second detectors Ea2, Ea3, and Ea9 can more easily determine that a fire has occurred after the first time point.

[0150] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0151] Here, let us assume that at a second time point, the second sensor Ea2 of the second sensors Ea2, Ea3, and Ea9 detects the occurrence of a fire (step ST5). That is, let us assume that at the second time point, the determination unit 52 of the second sensor Ea2 determines that a fire has occurred. As an example, let us assume that the determination unit 52 of the second sensor Ea2 determines that a fire has occurred because the second temperature detected by the fourth temperature detection unit 44 of the six temperature detection units 4 of the second sensor Ea2 exceeds the second temperature threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second temperature detected by the fourth temperature detection unit 44 of the second sensor Ea2 has exceeded the second temperature threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST6). The determination unit 52 of the second sensor Ea2 may determine that a fire has occurred based on at least one of the following: the second temperature exceeding the second temperature threshold; the gas concentration (second gas concentration) detected by at least one of the four gas detection units 10 included in the second sensor Ea2 exceeding the second gas threshold; and the second smoke concentration detected by the smoke detection unit 2 included in the second sensor Ea2 exceeding the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeding the second temperature threshold; the second gas concentration exceeding the second gas threshold; and the second smoke concentration exceeding the second smoke threshold.

[0152] When the notification unit 207 of the fire notification device 200 receives the second fire occurrence signal, it generates a notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the second detector Ea2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST7). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the second detector Ea2 in at least one of the following cases: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

[0153] In this way, when no airflow is occurring in the target space F2, it is highly likely that the detector Ea0, which is located on the first temperature detection unit 41 side of the first detector Ea1 that first detected the fire, will be the next to detect the fire. Therefore, by making it easier for the detector Ea0, which is located adjacent to the first detector Ea1 on the first temperature detection unit 41 side of the first detector Ea1, to detect the fire, it is possible to estimate the location of the source of the fire.

[0154] (2.2) Second Operation Example A second operation example of the fire notification system 100A will be described with reference to the flowchart in Fig. 5. In the second operation example, it is assumed that no airflow is occurring in the target space F2.

[0155] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0156] Here, it is assumed that the detector Ea1 detects the occurrence of a fire at a first time point (step ST1). That is, it is assumed that the determination unit 52 of the detector Ea1 determines that a fire has occurred at the first time point. In the following description, the detector Ea1 that determines that a fire has occurred at the first time point may be referred to as the first detector Ea1.

[0157] More specifically, the determination unit 52 of the first detector Ea1 determines that a fire has occurred when the first gas concentration detected by the first gas detection unit 101 of the four gas detection units 10 included in the first detector Ea1 exceeds the first gas threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first gas concentration detected by the first gas detection unit 101 of the first detector Ea1 has exceeded the first gas threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST2).

[0158] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from the multiple detectors Ea0, the detector Ea0 that is located adjacent to the first detector Ea1 on the side of the first gas detection unit 101. Specifically, the target selection unit 205 selects, from the multiple detectors Ea0, detectors Ea2 to Ea9 that are located adjacent to the first detector Ea1 around the first detector Ea1. Furthermore, from the detectors Ea2 to Ea9, the target selection unit 205 selects the detector Ea0 that is located adjacent to the first detector Ea1 on the side (east) of the first gas detection unit 101. In this embodiment, the target selection unit 205 selects, as the "detector Ea0 located adjacent to the first sensor Ea1 on the first gas detection unit 101 side (east side)," sensors Ea2, Ea3, and Ea9, which are the sensor Ea0 located adjacent to the first sensor Ea1 on the east side of the first sensor Ea1, from among the sensors Ea2 to Ea9 (step ST3). Note that the target selection unit 205 may select only sensor Ea2, which is the sensor Ea0 located adjacent to the first sensor Ea1 on the east side of the first sensor Ea1, as the "detector Ea0 located adjacent to the first sensor Ea1 on the first gas detection unit 101 side (east side)." In the following description, the sensors Ea2, Ea3, and Ea9 selected by the target selection unit 205 may be referred to as second sensors Ea2, Ea3, and Ea9, respectively.

[0159] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Ea2, Ea3, and Ea9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the four gas detection units 10 of the second detectors Ea2, Ea3, and Ea9 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second detectors Ea2, Ea3, and Ea9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST4). In other words, the determination units 52 of the second detectors Ea2, Ea3, and Ea9 can more easily determine that a fire has occurred after the first time point.

[0160] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0161] Here, let us assume that at a second time point, the second detector Ea2 of the second detectors Ea2, Ea3, and Ea9 detects the occurrence of a fire (step ST5). That is, let us assume that at the second time point, the determination unit 52 of the second detector Ea2 determines that a fire has occurred. As an example, let us assume that the determination unit 52 of the second detector Ea2 determines that a fire has occurred because the second gas concentration detected by the third gas detection unit 103 of the four gas detection units 10 of the second detector Ea2 exceeds the second gas threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second gas concentration detected by the third gas detection unit 103 of the second detector Ea2 has exceeded the second gas threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST6). The determination unit 52 of the second detector Ea2 may determine that a fire has occurred based on at least one of the following: the second temperature exceeding the second temperature threshold, the second gas concentration exceeding the second gas threshold, and the second smoke density exceeding the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeding the second temperature threshold, the second gas concentration exceeding the second gas threshold, and the second smoke density exceeding the second smoke threshold.

[0162] When the notification unit 207 of the fire notification device 200 receives the second fire occurrence signal, it generates a notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the second detector Ea2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST7). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the second detector Ea2 in at least one of the following cases: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

[0163] In this way, when no airflow is occurring in the target space F2, it is highly likely that the detector Ea0, which is located on the first gas detection unit 101 side of the first detector Ea1 that first detected the fire, will be the next to detect the fire. Therefore, by making it easier for the detector Ea0, which is located adjacent to the first detector Ea1 on the first gas detection unit 101 side of the first detector Ea1, to detect the fire, it is possible to estimate the location of the source of the fire.

[0164] (2.3) Third Operation Example A third operation example of the fire notification system 100A will be described with reference to the flowchart in Fig. 5. In the second operation example, it is assumed that no airflow is occurring in the target space F2.

[0165] First, at a certain point in time (first point in time), an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the first point in time, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0166] Here, it is assumed that the detector Ea1 detects the occurrence of a fire at a first time point (step ST1). That is, it is assumed that the determination unit 52 of the detector Ea1 determines that a fire has occurred at the first time point. In the following description, the detector Ea1 that determines that a fire has occurred at the first time point may be referred to as the first detector Ea1.

[0167] More specifically, the determination unit 52 of the first detector Ea1 determines that a fire has occurred when the first smoke density detected by the smoke detection unit 2 of the first detector Ea1 exceeds the first smoke threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first smoke density detected by the smoke detection unit 2 of the first detector Ea1 has exceeded the first smoke threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST2).

[0168] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from among the multiple detectors Ea0, detectors Ea2 to Ea9 that are located adjacent to the first detector Ea1 around the first detector Ea1 (step ST3). Note that in the following description, the detectors Ea2 to Ea9 selected by the target selection unit 205 may be referred to as second detectors Ea2 to Ea9, respectively.

[0169] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Ea2 to Ea9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the four gas detection units 10 of the second detectors Ea2 to Ea9 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second detectors Ea2 to Ea9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST4). In other words, the determination units 52 of the second detectors Ea2 to Ea9 can more easily determine that a fire has occurred after the first time point.

[0170] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0171] Here, it is assumed that, at a second time point, the second detector Ea2 among the second detectors Ea2 to Ea9 detects the occurrence of a fire (step ST5). That is, it is assumed that, at the second time point, the determination unit 52 of the second detector Ea2 determines that a fire has occurred. As an example, it is assumed that the determination unit 52 of the second detector Ea2 determines that a fire has occurred based on the second smoke density detected by the smoke detection unit 2 of the second detector Ea2 exceeding the second smoke threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second smoke density detected by the smoke detection unit 2 of the second detector Ea2 has exceeded the second smoke threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST6). It is sufficient that the determination unit 52 of the second detector Ea2 determines that a fire has occurred based on at least one of the following: the second temperature exceeding the second temperature threshold; the second gas density exceeding the second gas threshold; and the second smoke density exceeding the second smoke threshold. That is, the second fire signal indicates at least one of the following: the second temperature has exceeded the second temperature threshold; the second gas concentration has exceeded the second gas threshold; and the second smoke concentration has exceeded the second smoke threshold.

[0172] When the notification unit 207 of the fire notification device 200 receives the second fire occurrence signal, it generates a notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the second detector Ea2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST7). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the second detector Ea2 in at least one of the following cases: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

[0173] In this way, since it is highly likely that the detector Ea0 located around the first detector Ea1 that first detected the fire will be the next to detect the fire, by making it easier for the detector Ea0 located around the first detector Ea1 to detect the fire, the location of the source of the fire can be estimated.

[0174] (2.4) Fourth Operation Example A fourth operation example of the fire notification system 100A will be described with reference to the flowchart in Figure 6. In the fourth operation example, it is assumed that an air current is generated within the target space F2 by an air conditioning device such as an air conditioner. Therefore, the air whose temperature has risen due to a fire that has broken out within the target space F2, as well as the gas and smoke generated by the fire, travels within the target space F2 on the air current.

[0175] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0176] Here, it is assumed that the detector Ea1 detects the occurrence of a fire at a first time point (step ST11). That is, it is assumed that the determination unit 52 of the detector Ea1 determines that a fire has occurred at the first time point. In the following description, the detector Ea1 that determines that a fire has occurred at the first time point may be referred to as the first detector Ea1.

[0177] More specifically, the determination unit 52 of the first sensor Ea1 determines that a fire has occurred when the first temperature detected by the first temperature detection unit 41 of the six temperature detection units 4 of the first sensor Ea1 exceeds the first temperature threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first temperature detected by the first temperature detection unit 41 of the first sensor Ea1 has exceeded the first temperature threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST12).

[0178] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from the multiple detectors Ea0, detector Ea0 that is located adjacent to the first detector Ea1 on the opposite side of the first temperature detection unit 41. Specifically, the target selection unit 205 selects, from the multiple detectors Ea0, detectors Ea2 to Ea9 that are located adjacent to the first detector Ea1 around the first detector Ea1. Furthermore, from the detectors Ea2 to Ea9, the target selection unit 205 selects detector Ea0 that is located adjacent to the first detector Ea1 on the opposite side (west side) of the first temperature detection unit 41. In this embodiment, the target selection unit 205 selects sensors Ea5, Ea6, and Ea7, which are sensors Ea0 arranged adjacent to the first sensor Ea1 on the west side of the first sensor Ea1, from among the sensors Ea2 to Ea9 as "sensor Ea0 arranged adjacent to the first sensor Ea1 on the opposite side (west side) of the first temperature detection unit 41" (step ST13). Note that the target selection unit 205 may select only sensor Ea6, which is a sensor Ea0 arranged adjacent to the first sensor Ea1 on the west side of the first sensor Ea1, as "sensor Ea0 arranged adjacent to the first sensor Ea1 on the opposite side (west side) of the first temperature detection unit 41." In the following description, the sensors Ea5, Ea6, and Ea7 selected by the target selection unit 205 may be referred to as second sensors Ea5, Ea6, and Ea7, respectively.

[0179] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Ea5, Ea6, and Ea7 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the four gas detection units 10 of the second detectors Ea5, Ea6, and Ea7 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second detectors Ea5, Ea6, and Ea7 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST14). In other words, the determination units 52 of the second detectors Ea5, Ea6, and Ea7 can more easily determine that a fire has occurred after the first time point.

[0180] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0181] Here, it is assumed that, at a second time point, the second sensor Ea6 of the second sensors Ea5, Ea6, and Ea7 detects the occurrence of a fire (step ST15). That is, it is assumed that, at the second time point, the determination unit 52 of the second sensor Ea6 determines that a fire has occurred. As an example, it is assumed that the determination unit 52 of the second sensor Ea6 determines that a fire has occurred because the second temperature detected by the first temperature detection unit 41 of the six temperature detection units 4 of the second sensor Ea6 exceeds the second temperature threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second temperature detected by the first temperature detection unit 41 of the second sensor Ea6 has exceeded the second temperature threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST16). The determination unit 52 of the second detector Ea6 may determine that a fire has occurred when at least one of the following occurs: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke density exceeds the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke density exceeds the second smoke threshold.

[0182] When the target selection unit 205 of the fire notification device 200 receives the second fire occurrence signal, it selects, from the multiple detectors Ea0, the detector Ea0 that is located adjacent to the first detector Ea1 on the side of the first temperature detection unit 41. Specifically, the target selection unit 205 selects, from the detectors Ea2 to Ea9, the detector Ea0 that is located adjacent to the first detector Ea1 on the side (east) of the first temperature detection unit 41. Here, in the present embodiment, the target selection unit 205 selects, from the detectors Ea2 to Ea9, the detector Ea2, Ea3, and Ea9 that are the detector Ea0 that is located adjacent to the first detector Ea1 on the east side of the first detector Ea1 as the "detector Ea0 that is located adjacent to the first detector Ea1 on the side (east) of the first temperature detection unit 41." The target selection unit 205 may select only the sensor Ea2 that is the sensor Ea0 that is located adjacent to the first sensor Ea1 on the east side as viewed from the first sensor Ea1 as the "sensor Ea0 that is located adjacent to the first sensor Ea1 on the first temperature detection unit 41 side (east side)." In the following description, the second sensors Ea2, Ea3, and Ea9 selected by the target selection unit 205 may be referred to as the third sensors Ea2, Ea3, and Ea9, respectively.

[0183] Furthermore, the target selection unit 205 selects the third sensor Ea2 from among the third sensors Ea2, Ea3, and Ea9, which faces the second sensor Ea6 that detected the occurrence of the fire via the first sensor Ea1 (step ST17).

[0184] When the target selection unit 205 selects the third detector Ea2, the notification unit 207 of the fire notification device 200 generates a notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the third detector Ea2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST18). That is, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, or when the second smoke concentration exceeds the second smoke threshold, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the third detector Ea2.

[0185] In this way, when an air current is occurring in the target space F2, it is highly likely that the detector Ea0, which is located on the opposite side of the first temperature detection unit 41 of the first detector Ea1 that first detected the fire, will be the next to detect the fire. Therefore, by making it easier for the detector Ea0, which is located adjacent to the first detector Ea1 on the opposite side of the first temperature detection unit 41 of the first detector Ea1, to detect the fire, it is possible to estimate the location of the source of the fire.

[0186] (2.5) Fifth Operation Example A fifth operation example of the fire notification system 100A will be described with reference to the flowchart in FIG. 6. In the fifth operation example, it is assumed that an air current is generated within the target space F2 by an air conditioning device such as an air conditioner. Therefore, the air whose temperature has risen due to a fire that has broken out within the target space F2, as well as the gas and smoke generated by the fire, travels within the target space F2 on the air current.

[0187] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0188] Here, it is assumed that the detector Ea1 detects the occurrence of a fire at a first time point (step ST11). That is, it is assumed that the determination unit 52 of the detector Ea1 determines that a fire has occurred at the first time point. In the following description, the detector Ea1 that determines that a fire has occurred at the first time point may be referred to as the first detector Ea1.

[0189] More specifically, the determination unit 52 of the first detector Ea1 determines that a fire has occurred when the first gas concentration detected by the first gas detection unit 101 of the four gas detection units 10 included in the first detector Ea1 exceeds the first gas threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first gas concentration detected by the first gas detection unit 101 of the first detector Ea1 has exceeded the first gas threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST12).

[0190] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from the multiple detectors Ea0, detector Ea0 that is located adjacent to the first detector Ea1 on the opposite side of the first gas detection unit 101. Specifically, the target selection unit 205 selects, from the multiple detectors Ea0, detectors Ea2 to Ea9 that are located adjacent to the first detector Ea1 around the first detector Ea1. Furthermore, from the detectors Ea2 to Ea9, the target selection unit 205 selects detector Ea0 that is located adjacent to the first detector Ea1 on the opposite side (west side) of the first gas detection unit 101. In this embodiment, the target selection unit 205 selects, among the detectors Ea2 to Ea9, detectors Ea5, Ea6, and Ea7, which are detectors Ea0 arranged adjacent to the first detector Ea1 on the west side of the first detector Ea1, as "detector Ea0 arranged adjacent to the first detector Ea1 on the opposite side (west side) of the first gas detection unit 101" (step ST13). Note that the target selection unit 205 may select only detector Ea6, which is detector Ea0 arranged adjacent to the first detector Ea1 on the west side of the first detector Ea1, as "detector Ea0 arranged adjacent to the first detector Ea1 on the opposite side (west side) of the first gas detection unit 101." In the following description, the detectors Ea5, Ea6, and Ea7 selected by the target selection unit 205 may be referred to as second detectors Ea5, Ea6, and Ea7, respectively.

[0191] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Ea5, Ea6, and Ea7 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the four gas detection units 10 of the second detectors Ea5, Ea6, and Ea7 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second detectors Ea5, Ea6, and Ea7 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST14). In other words, the determination units 52 of the second detectors Ea5, Ea6, and Ea7 can more easily determine that a fire has occurred after the first time point.

[0192] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0193] Here, let us assume that at a second time point, the second detector Ea6 of the second detectors Ea5, Ea6, and Ea7 detects the occurrence of a fire (step ST15). That is, let us assume that at the second time point, the determination unit 52 of the second detector Ea6 determines that a fire has occurred. As an example, let us assume that the determination unit 52 of the second detector Ea6 determines that a fire has occurred because the second gas concentration detected by the first detector 101 of the four detectors 10 included in the second detector Ea6 exceeds the second gas threshold. At this time, the signal generator 54 generates a second fire occurrence signal indicating that the second gas concentration detected by the first detector 101 of the second detector Ea6 has exceeded the second gas threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST16). The determination unit 52 of the second detector Ea6 may determine that a fire has occurred when at least one of the following occurs: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke density exceeds the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke density exceeds the second smoke threshold.

[0194] When the target selection unit 205 of the fire notification device 200 receives the second fire occurrence signal, it selects, from the multiple detectors Ea0, the detector Ea0 that is arranged adjacent to the first detector Ea1 on the first gas detection unit 101 side. Specifically, the target selection unit 205 selects, from the detectors Ea2 to Ea9, the detector Ea0 that is arranged adjacent to the first detector Ea1 on the first gas detection unit 101 side (east side). Here, in the present embodiment, the target selection unit 205 selects, from the detectors Ea2 to Ea9, detectors Ea2, Ea3, and Ea9 that are the detector Ea0 that is arranged adjacent to the first detector Ea1 on the east side of the first detector Ea1 as the "detector Ea0 that is arranged adjacent to the first detector Ea1 on the first gas detection unit 101 side (east side)." The target selection unit 205 may select only the detector Ea2 that is the detector Ea0 that is located adjacent to the first detector Ea1 on the east side as viewed from the first detector Ea1 as the "detector Ea0 that is located adjacent to the first detector Ea1 on the first gas detection unit 101 side (east side)." In the following description, the second detectors Ea2, Ea3, and Ea9 selected by the target selection unit 205 may be referred to as the third detectors Ea2, Ea3, and Ea9, respectively.

[0195] Furthermore, the target selection unit 205 selects the third sensor Ea2 from among the third sensors Ea2, Ea3, and Ea9, which faces the second sensor Ea6 that detected the occurrence of the fire via the first sensor Ea1 (step ST17).

[0196] When the target selection unit 205 selects the third detector Ea2, the notification unit 207 of the fire notification device 200 generates a notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the third detector Ea2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST18). That is, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, or when the second smoke concentration exceeds the second smoke threshold, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the third detector Ea2.

[0197] In this way, when an airflow is occurring in the target space F2, it is highly likely that the detector Ea0, which is located on the opposite side of the first gas detection unit 101 of the first detector Ea1 that first detected the fire, will be the next to detect the fire. Therefore, by making it easier for the detector Ea0, which is located adjacent to the first detector Ea1 on the opposite side of the first gas detection unit 101 of the first detector Ea1, to detect the fire, it is possible to estimate the location of the source of the fire.

[0198] (2.6) Sixth Operation Example A sixth operation example of the fire notification system 100a will be described with reference to the flowchart in FIG. 7. In the sixth operation example, it is assumed that an air current is generated within the target space F2 by an air conditioning device such as an air conditioner. Therefore, the air whose temperature has risen due to a fire that has broken out within the target space F2 and the smoke generated by the fire move within the target space F2 on the air current.

[0199] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0200] Here, it is assumed that the detector Ea1 detects the occurrence of a fire at a first time point (step ST21). That is, it is assumed that the determination unit 52 of the detector Ea1 determines that a fire has occurred at the first time point. In the following description, the detector Ea1 that determines that a fire has occurred at the first time point may be referred to as the first detector Ea1.

[0201] More specifically, the determination unit 52 of the first detector Ea1 determines that a fire has occurred when the first smoke density detected by the smoke detection unit 2 of the first detector Ea1 exceeds the first smoke threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first smoke density detected by the smoke detection unit 2 of the first detector Ea1 has exceeded the first smoke threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST22).

[0202] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects the detector Ea0 that is located adjacent to the first detector Ea1 from among the multiple detectors Ea0. Specifically, the target selection unit 205 selects the detectors Ea2 to Ea9 that are located adjacent to the first detector Ea1 around the first detector Ea1 from among the multiple detectors Ea0 (step ST23). In the following description, the detectors Ea2 to Ea9 selected by the target selection unit 205 may be referred to as second detectors Ea2 to Ea9, respectively.

[0203] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Ea2 to Ea9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the four gas detection units 10 of the second detectors Ea2 to Ea9 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration threshold of the smoke detection units 2 of the second detectors Ea2 to Ea9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST24). In other words, the determination units 52 of the second detectors Ea2 to Ea9 can more easily determine that a fire has occurred after the first time point.

[0204] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Ea0 including detectors Ea1 to Ea12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Ea0, the gas concentration detected by the plurality of gas detection units 10 included in each detector Ea0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Ea0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Ea0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Ea0.

[0205] Here, assume that, at a second time point, second detector Ea6 of second detectors Ea2 to Ea9 detects the occurrence of a fire (step ST25). That is, assume that, at the second time point, determination unit 52 of second detector Ea6 determines that a fire has occurred. As an example, assume that determination unit 52 of second detector Ea6 determines that a fire has occurred because the second smoke density detected by smoke detection unit 2 of second detector Ea6 exceeds the second smoke threshold. At this time, signal generation unit 54 generates a second fire occurrence signal indicating that the second smoke density detected by smoke detection unit 2 of second detector Ea6 has exceeded the second smoke threshold, and transmits the second fire occurrence signal to fire notification device 200 (step ST26). The determination unit 52 of the second detector Ea6 may determine that a fire has occurred when at least one of the following occurs: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke density exceeds the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke density exceeds the second smoke threshold.

[0206] When the target selection unit 205 of the fire notification device 200 receives the second fire occurrence signal, it selects, from the multiple detectors Ea0, the detector Ea0 that is located adjacent to the first detector Ea1 on the opposite side of the second detector Ea6. Specifically, the target selection unit 205 selects, from the multiple detectors Ea0, the detector Ea0 that is located adjacent to the first detector Ea1 on the opposite side (east side) of the second detector Ea6. Here, in the present embodiment, the target selection unit 205 selects, from the multiple detectors Ea0, detectors Ea2, Ea3, and Ea9 that are located adjacent to the first detector Ea1 on the east side of the first detector Ea1 as the "detector Ea0 that is located adjacent to the first detector Ea1 on the opposite side (east side) of the second detector Ea6." The target selection unit 205 may select only the sensor Ea2, which is the sensor Ea0 located adjacent to the first sensor Ea1 on the east side as viewed from the first sensor Ea1, as the "sensor Ea0 located adjacent to the first sensor Ea1 on the opposite side (east side) from the second sensor Ea6." In the following description, the second sensors Ea2, Ea3, and Ea9 selected by the target selection unit 205 may be referred to as the third sensors Ea2, Ea3, and Ea9, respectively.

[0207] Furthermore, the target selection unit 205 selects the third sensor Ea2 from among the third sensors Ea2, Ea3, and Ea9, which faces the second sensor Ea6 that detected the occurrence of the fire via the first sensor Ea1 (step ST27).

[0208] When the target selection unit 205 selects the third detector Ea2, the notification unit 207 of the fire notification device 200 generates a notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the third detector Ea2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST28). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector Ea1 and the third detector Ea2 in at least one of the following cases: when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold.

[0209] Furthermore, upon receiving the second fire signal, the target selection unit 205 of the fire notification device 200 selects, from among the multiple detectors Ea0, detectors Ea4, Ea5, Ea7, Ea8, Ea10, Ea11, and Ea12 that are detectors Ea0 other than detector Ea1 located adjacent to the second detector Ea6 around the second detector Ea6 (step ST29). Note that in the following description, the detectors Ea4, Ea5, Ea7, Ea8, Ea10, Ea11, and Ea12 selected by the target selection unit 205 may be referred to as fourth detectors Ea4, Ea5, Ea7, Ea8, Ea10, Ea11, and Ea12, respectively.

[0210] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 included in the fourth sensors Ea4, Ea5, Ea7, Ea8, Ea10, Ea11, and Ea12 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the four gas detection units 10 included in the fourth sensors Ea4, Ea5, Ea7, Ea8, Ea10, Ea11, and Ea12 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration thresholds of the smoke detection units 2 included in the fourth sensors Ea4, Ea5, Ea7, Ea8, Ea10, Ea11, and Ea12 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST30). In other words, the determination units 52 of the fourth sensors Ea4, Ea5, Ea7, Ea8, Ea10, Ea11, and Ea12 can more easily determine that a fire has occurred after the second time point.

[0211] In this way, since it is highly likely that the detector Ea0 located around the first detector Ea1 that first detected the fire will be the next to detect the fire, by making it easier for the detector Ea0 located around the first detector Ea1 to detect the fire, the location of the source of the fire can be estimated.

[0212] Furthermore, by making it easier for a detector Ea0 adjacent to a detector Ea0 that detected a fire after the first detector Ea1, other than the first detector Ea1, to detect a fire, it becomes easier to identify the direction of travel of the air whose temperature has risen due to the fire, and the gas and smoke generated by the fire.

[0213] (Embodiment 3) A fire notification system 100B that executes a fire notification method according to embodiment 3 will be described in detail below with reference to the drawings. Note that, with respect to the fire notification system 100B, components similar to those of the fire notification system 100 that executes the fire notification method according to embodiment 1 will be assigned the same reference numerals and descriptions thereof will be omitted.

[0214] (1) Configuration The configuration of the fire notification system 100B will be described in detail below with reference to the drawings.

[0215] 8 and 10, the fire notification system 100B includes a plurality of detectors Eb0 and a fire notification device 200. That is, the plurality of detectors Eb0 are used in the fire notification method according to this embodiment.

[0216] (1.1) Sensors Each of the sensors Eb0 includes the same components as the sensor E0, and further includes one gas detection unit 10 (hereinafter simply referred to as the gas detection unit 10).

[0217] One gas detection unit 10 is installed, for example, on the lower surface of the upper cover 1B of the housing 1.

[0218] The gas detection unit 10 is electrically connected to the control unit 5 mounted on the base 3. The gas detection unit 10 transmits to the control unit 5 an electrical signal (detection signal) indicating the concentration of the detected gas.

[0219] The acquisition unit 51 of the control unit 5 periodically acquires the temperatures detected by the plurality of temperature detection units 4 , the smoke concentration detected by the smoke detection unit 2 , and the gas concentration detected by the gas detection unit 10 .

[0220] The determination unit 52 of the control unit 5 periodically determines whether or not a fire has occurred based on the temperatures acquired by the acquisition unit 51 from the plurality of temperature detection units 4, the smoke concentration acquired from the smoke detection unit 2, and the gas concentration acquired from the gas detection unit 10. The determination unit 52 determines whether or not a fire has occurred, for example, every time the acquisition unit 51 acquires temperature, smoke concentration, and gas concentration data from the plurality of temperature detection units 4, the smoke detection unit 2, and the gas detection unit 10, respectively. In other words, the determination unit 52 periodically determines whether or not a fire has occurred.

[0221] More specifically, the determination unit 52 compares the temperatures acquired from the plurality of temperature detection units 4 with a temperature threshold (temperature threshold). The determination unit 52 also compares the smoke concentration acquired from the smoke detection unit 2 with a smoke concentration threshold (smoke threshold). The determination unit 52 also compares the gas concentration acquired from the gas detection unit 10 with a gas concentration threshold (gas threshold). The determination unit 52 determines that a fire has occurred in at least one of the following cases: when the temperatures acquired from the plurality of temperature detection units 4 exceed the temperature threshold; when the smoke concentration acquired from the smoke detection unit 2 exceeds the smoke threshold; and when the gas concentration acquired from the gas detection unit 10 exceeds the gas threshold.

[0222] (1.2) Fire Notification Device When the first communication unit 201 receives a fire occurrence signal, the threshold setting unit 206 of the control unit 204 included in the fire notification device 200 changes the smoke threshold of the smoke detection unit 2 of each of the multiple detectors Eb0 other than the detector Eb0 that transmitted the fire occurrence signal from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold. The first smoke threshold is a value initially set in the memory unit 9 and is a threshold of smoke concentration that serves as a criterion for determining whether a fire has occurred based on the detection result of the smoke detection unit 2 by the determination unit 52. Specifically, the threshold setting unit 206 rewrites the first smoke threshold stored in the memory unit 9 of each of the detectors Eb0 other than the detector Eb0 that transmitted the fire occurrence signal to the second smoke threshold.

[0223] Furthermore, when the first communication unit 201 receives a fire occurrence signal, the threshold setting unit 206 changes the gas threshold of the gas detection unit 10 of each of the multiple detectors Eb0 other than the detector Eb0 that transmitted the fire occurrence signal from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The first gas threshold is a value that is initially set in the storage unit 9, and is a temperature threshold that serves as a criterion for determining whether a fire has occurred based on the detection result of the gas detection unit 10 by the determination unit 52. Specifically, the threshold setting unit 206 rewrites the first gas threshold stored in the storage unit 9 of each of the detectors Eb0 other than the detector Eb0 that transmitted the fire occurrence signal to the second gas threshold.

[0224] The detector Eb0 for which the threshold setting unit 206 will change the temperature threshold, smoke threshold, and gas threshold is selected by the target selection unit 205. The target selection unit 205 selects the detector Eb0 for which the threshold setting unit 206 will change the temperature threshold, smoke threshold, and gas threshold, based on data indicating the arrangement positions of the multiple detectors Eb0 within the target space F2 stored in the memory unit 9.

[0225] (2) Operational Example of Fire Notification System According to Third Embodiment An operational example of the fire notification system 100B according to the third embodiment will be described below with reference to FIGS. 5 to 8 and 10. FIG.

[0226] In the following description, it is assumed that the arrangement of the 12 sensors Eb0 (Eb1 to Eb12) shown in FIG. 10 is the same as the arrangement of the sensors E1 to E12 in the first embodiment.

[0227] 10, for the sake of explanation, the smoke detection unit 2, six temperature detection units 4, and gas detection unit 10 of the sensor Eb0 are visualized. Here, the six temperature detection units 4 of the sensor Eb0 are arranged at equal intervals in the circumferential direction around the smoke detection unit 2. The sensor Eb0 is arranged so that two of the six temperature detection units 4 that face each other are aligned in the east-west direction.

[0228] (2.1) First Operation Example A first operation example of the fire alarm system 100B will be described with reference to the flowchart in Fig. 5. In the first operation example, it is assumed that no airflow is generated in the target space F2.

[0229] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Eb0 including detectors Eb1 to Eb12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Eb0, the gas concentration detected by the gas detection unit 10 included in each detector Eb0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Eb0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Eb0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Eb0.

[0230] Here, it is assumed that detector Eb1 detects the occurrence of a fire at a first time point (step ST1). That is, it is assumed that the determination unit 52 of detector Eb1 determines that a fire has occurred at the first time point. In the following description, detector Eb1 that determines that a fire has occurred at the first time point may be referred to as the first detector Eb1.

[0231] More specifically, the determination unit 52 of the first detector Eb1 determines that a fire has occurred when the first temperature detected by the first temperature detection unit 41 of the six temperature detection units 4 of the first detector Eb1 exceeds the first temperature threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first temperature detected by the first temperature detection unit 41 of the first detector Eb1 has exceeded the first temperature threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST2).

[0232] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from the plurality of detectors Eb0, detector Eb0 that is located adjacent to the first detector Eb1 on the side of the first temperature detection unit 41. Specifically, the target selection unit 205 selects, from the plurality of detectors Eb0, detectors Eb2 to Eb9 that are located adjacent to the first detector Eb1 around the first detector Eb1. Furthermore, from the detectors Eb2 to Eb9, the target selection unit 205 selects detector Eb0 that is located adjacent to the first detector Eb1 on the side (east) of the first temperature detection unit 41. In this embodiment, the target selection unit 205 selects, as the "sensor Eb0 located adjacent to the first sensor Eb1 on the first temperature detection unit 41 side (east side)," sensors Eb2, Eb3, and Eb9, which are sensors Eb0 located adjacent to the first sensor Eb1 on the east side of the first sensor Eb1, from among the sensors Eb2 to Eb9 (step ST3). Note that the target selection unit 205 may select only sensor Eb2, which is a sensor Eb0 located adjacent to the first sensor Eb1 on the east side of the first sensor Eb1, as the "sensor Eb0 located adjacent to the first sensor Eb1 on the first temperature detection unit 41 side (east side)." In the following description, the sensors Eb2, Eb3, and Eb9 selected by the target selection unit 205 may be referred to as second sensors Eb2, Eb3, and Eb9, respectively.

[0233] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Eb2, Eb3, and Eb9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the gas detection units 10 of the second detectors Eb2, Eb3, and Eb9 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration thresholds of the smoke detection units 2 of the second detectors Eb2, Eb3, and Eb9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST4). In other words, the determination units 52 of the second detectors Eb2, Eb3, and Eb9 can more easily determine that a fire has occurred after the first time point.

[0234] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Eb0 including detectors Eb1 to Eb12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Eb0, the gas concentration detected by the gas detection unit 10 included in each detector Eb0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Eb0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Eb0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Eb0.

[0235] Here, let us assume that at the second time point, the second sensor Eb2 of the second sensors Eb2, Eb3, and Eb9 detects the occurrence of a fire (step ST5). That is, let us assume that at the second time point, the determination unit 52 of the second sensor Eb2 determines that a fire has occurred. As an example, let us assume that the determination unit 52 of the second sensor Eb2 determines that a fire has occurred when the second temperature detected by the fourth temperature detection unit 44 of the six temperature detection units 4 of the second sensor Eb2 exceeds the second temperature threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second temperature detected by the fourth temperature detection unit 44 of the second sensor Eb2 has exceeded the second temperature threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST6). The determination unit 52 of the second detector Eb2 may determine that a fire has occurred based on at least one of the following: the second temperature exceeding the second temperature threshold; the gas concentration (second gas concentration) detected by the gas detection unit 10 of the second detector Eb2 exceeding the second gas threshold; and the second smoke concentration detected by the smoke detection unit 2 of the second detector Eb2 exceeding the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeding the second temperature threshold; the second gas concentration exceeding the second gas threshold; and the second smoke concentration exceeding the second smoke threshold.

[0236] When the notification unit 207 of the fire notification device 200 receives the second fire occurrence signal, it generates a notification signal notifying that a fire has occurred with its origin located between the first detector Eb1 and the second detector Eb2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST7). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector Eb1 and the second detector Eb2 in at least one of the following cases: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

[0237] In this way, when no airflow is occurring in the target space F2, it is highly likely that the detector Eb0, which is located on the first temperature detection unit 41 side of the first detector Eb1 that first detected the fire, will be the next to detect the fire. Therefore, by making it easier for the detector Eb0, which is located adjacent to the first detector Eb1 on the first temperature detection unit 41 side of the first detector Eb1, to detect the fire, it is possible to estimate the location of the source of the fire.

[0238] (2.2) Second Operation Example A second operation example of the fire alarm system 100B will be described with reference to the flowchart in Fig. 5. In the second operation example, it is assumed that no airflow is generated in the target space F2.

[0239] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Eb0 including detectors Eb1 to Eb12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Eb0, the gas concentration detected by the gas detection unit 10 included in each detector Eb0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Eb0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Eb0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Eb0.

[0240] Here, it is assumed that detector Eb1 detects the occurrence of a fire at a first time point (step ST1). That is, it is assumed that the determination unit 52 of detector Eb1 determines that a fire has occurred at the first time point. In the following description, detector Eb1 that determines that a fire has occurred at the first time point may be referred to as the first detector Eb1.

[0241] More specifically, the determination unit 52 of the first detector Eb1 determines that a fire has occurred based on the fact that the first gas concentration detected by the gas detection unit 10 of the first detector Eb1 has exceeded the first gas threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first gas concentration detected by the gas detection unit 10 of the first detector Eb1 has exceeded the first gas threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST2). Note that, at the first time point, the determination unit 52 of the first detector Eb1 may also determine that a fire has occurred based on the fact that the first smoke concentration detected by the smoke detection unit 2 of the first detector Eb1 has exceeded the first smoke threshold. In this case, the first fire occurrence signal indicates that the first smoke concentration detected by the smoke detection unit 2 of the first detector Eb1 has exceeded the first smoke threshold. Furthermore, at the first time point, the determination unit 52 of the first detector Eb1 may determine that a fire has occurred based on the fact that the first gas concentration detected by the gas detection unit 10 of the first detector Eb1 has exceeded the first gas threshold and the first smoke concentration detected by the smoke detection unit 2 of the first detector Eb1 has exceeded the first smoke threshold. In this case, the first fire occurrence signal indicates that the first gas concentration detected by the gas detection unit 10 of the first detector Eb1 has exceeded the first gas threshold and that the first smoke concentration detected by the smoke detection unit 2 of the first detector Eb1 has exceeded the first smoke threshold.

[0242] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects the detector Eb0 that is located adjacent to the first detector Eb1 from among the multiple detectors Eb0. Specifically, the target selection unit 205 selects the detectors Eb2 to Eb9 that are located adjacent to the first detector Eb1 around the first detector Eb1 from among the multiple detectors Eb0 (step ST3). In the following description, the detectors Eb2 to Eb9 selected by the target selection unit 205 may be referred to as second detectors Eb2 to Eb9, respectively.

[0243] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Eb2 to Eb9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the gas detection units 10 of the second detectors Eb2 to Eb9 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration thresholds of the smoke detection units 2 of the second detectors Eb2 to Eb9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST4). In other words, the determination units 52 of the second detectors Eb2 to Eb9 can more easily determine that a fire has occurred after the first time point.

[0244] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Eb0 including detectors Eb1 to Eb12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Eb0, the gas concentration detected by the gas detection unit 10 included in each detector Eb0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Eb0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Eb0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Eb0.

[0245] Here, it is assumed that, at a second time point, the second detector Eb2 among the second detectors Eb2 to Eb9 detects the occurrence of a fire (step ST5). That is, it is assumed that, at the second time point, the determination unit 52 of the second detector Eb2 determines that a fire has occurred. As an example, it is assumed that the determination unit 52 of the second detector Eb2 determines that a fire has occurred because the second gas concentration detected by the gas detection unit 10 of the second detector Eb2 has exceeded the second gas threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second gas concentration detected by the gas detection unit 10 of the second detector Eb2 has exceeded the second gas threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST6). The determination unit 52 of the second detector Eb2 may determine that a fire has occurred based on at least one of the following: the second temperature exceeding the second temperature threshold, the second gas concentration exceeding the second gas threshold, and the second smoke density exceeding the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeding the second temperature threshold, the second gas concentration exceeding the second gas threshold, and the second smoke density exceeding the second smoke threshold.

[0246] When the notification unit 207 of the fire notification device 200 receives the second fire occurrence signal, it generates a notification signal notifying that a fire has occurred with its origin located between the first detector Eb1 and the second detector Eb2, and transmits the notification signal to the information terminal 300 via the second communication unit 202 (step ST7). That is, the notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between the first detector Eb1 and the second detector Eb2 in at least one of the following cases: the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

[0247] In this way, since it is highly likely that detector Eb0 located around the first detector Eb1 that first detected the fire will be the next to detect the fire, by making it easier for detector Eb0 located around the first detector Eb1 to detect the fire, the location of the source of the fire can be estimated.

[0248] (2.3) Third Operation Example A third operation example of the fire alarm system 100B will be described with reference to the flowchart in Figure 6. In the third operation example, it is assumed that an air current is generated in the target space F2 by an air conditioning device such as an air conditioner. Therefore, the air whose temperature has risen due to a fire that has broken out in the target space F2 and the smoke generated by the fire move within the target space F2 on the air current.

[0249] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Eb0 including detectors Eb1 to Eb12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Eb0, the gas concentration detected by the gas detection unit 10 included in each detector Eb0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Eb0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Eb0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Eb0.

[0250] Here, it is assumed that detector Eb1 detects the occurrence of a fire at a first time point (step ST11). That is, it is assumed that the determination unit 52 of detector Eb1 determines that a fire has occurred at the first time point. In the following description, detector Eb1 that determines that a fire has occurred at the first time point may be referred to as the first detector Eb1.

[0251] More specifically, the determination unit 52 of the first detector Eb1 determines that a fire has occurred when the first temperature detected by the first temperature detection unit 41 of the six temperature detection units 4 of the first detector Eb1 exceeds the first temperature threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first temperature detected by the first temperature detection unit 41 of the first detector Eb1 has exceeded the first temperature threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST12).

[0252] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects, from the multiple detectors Eb0, detector Eb0 that is located adjacent to the first detector Eb1 on the opposite side of the first temperature detection unit 41. Specifically, the target selection unit 205 selects, from the multiple detectors Eb0, detectors Eb2 to Eb9 that are located adjacent to the first detector Eb1 around the first detector Eb1. Furthermore, from the detectors Eb2 to Eb9, the target selection unit 205 selects detector Eb0 that is located adjacent to the first detector Eb1 on the opposite side (west side) of the first temperature detection unit 41. In this embodiment, the target selection unit 205 selects sensors Eb5, Eb6, and Eb7, which are sensors Eb0 arranged adjacent to the first sensor Eb1 on the west side of the first sensor Eb1, from among the sensors Eb2 to Eb9 as "sensor Eb0 arranged adjacent to the first sensor Eb1 on the opposite side (west side) of the first temperature detection unit 41" (step ST13). Note that the target selection unit 205 may select only sensor Eb6, which is a sensor Eb0 arranged adjacent to the first sensor Eb1 on the west side of the first sensor Eb1, as "sensor Eb0 arranged adjacent to the first sensor Eb1 on the opposite side (west side) of the first temperature detection unit 41." In the following description, the sensors Eb5, Eb6, and Eb7 selected by the target selection unit 205 may be referred to as second sensors Eb5, Eb6, and Eb7, respectively.

[0253] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Eb5, Eb6, and Eb7 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the gas detection units 10 of the second detectors Eb2 to Eb9 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration thresholds of the smoke detection units 2 of the second detectors Eb5, Eb6, and Eb7 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST14). In other words, the determination units 52 of the second detectors Eb5, Eb6, and Eb7 are more likely to determine that a fire has occurred after the first time point.

[0254] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Eb0 including detectors Eb1 to Eb12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Eb0, the gas concentration detected by the gas detection unit 10 included in each detector Eb0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Eb0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Eb0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Eb0.

[0255] Here, assume that, at the second time point, the second sensor Eb6 of the second sensors Eb5, Eb6, and Eb7 detects the occurrence of a fire (step ST15). That is, assume that, at the second time point, the determination unit 52 of the second sensor Eb6 determines that a fire has occurred. As an example, assume that the determination unit 52 of the second sensor Eb6 determines that a fire has occurred because the second temperature detected by the first temperature detection unit 41 of the six temperature detection units 4 of the second sensor Eb6 exceeds the second temperature threshold. At this time, the signal generation unit 54 generates a second fire occurrence signal indicating that the second temperature detected by the first temperature detection unit 41 of the second sensor Eb6 has exceeded the second temperature threshold, and transmits the second fire occurrence signal to the fire notification device 200 (step ST16). The determination unit 52 of the second detector Eb2 may determine that a fire has occurred based on at least one of the following: the second temperature exceeding the second temperature threshold, the second gas concentration exceeding the second gas threshold, and the second smoke density exceeding the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeding the second temperature threshold, the second gas concentration exceeding the second gas threshold, and the second smoke density exceeding the second smoke threshold.

[0256] When the target selection unit 205 of the fire notification device 200 receives the second fire occurrence signal, it selects, from the multiple detectors Eb0, detector Eb0 that is arranged adjacent to the first detector Eb1 on the first temperature detection unit 41 side. Specifically, the target selection unit 205 selects, from detectors Eb2 to Eb9, detector Eb0 that is arranged adjacent to the first detector Eb1 on the first temperature detection unit 41 side (east side). Here, in the present embodiment, the target selection unit 205 selects, from detectors Eb2 to Eb9, detectors Eb2, Eb3, and Eb9 that are detector Eb0 that is arranged adjacent to the first detector Eb1 on the east side of the first detector Eb1 as the "detector Eb0 that is arranged adjacent to the first detector Eb1 on the first temperature detection unit 41 side (east side)." Note that the target selection unit 205 may select only the sensor Eb2 that is the sensor Eb0 that is located adjacent to the first sensor Eb1 on the east side as viewed from the first sensor Eb1 as the "sensor Eb0 that is located adjacent to the first sensor Eb1 on the first temperature detection unit 41 side (east side)." In the following description, the second sensors Eb2, Eb3, and Eb9 selected by the target selection unit 205 may be referred to as the third sensors Eb2, Eb3, and Eb9, respectively.

[0257] Furthermore, the target selection unit 205 selects the third sensor Eb2 from among the third sensors Eb2, Eb3, and Eb9, which faces the second sensor Eb6 that detected the occurrence of the fire via the first sensor Eb1 (step ST17).

[0258] When target selection unit 205 selects third detector Eb2, notification unit 207 of fire notification device 200 generates a notification signal notifying that a fire has occurred with its origin located between first detector Eb1 and third detector Eb2, and transmits the notification signal to information terminal 300 via second communication unit 202 (step ST18). That is, notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between first detector Eb1 and third detector Eb2 in at least one of the following cases: when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold.

[0259] In this way, when an air current is occurring in the target space F2, it is highly likely that the detector Eb0, which is located on the opposite side of the first temperature detection unit 41 of the first detector Eb1 that first detected the fire, will be the next to detect the fire. Therefore, by making it easier for the detector Eb0, which is located adjacent to the first detector Eb1 on the opposite side of the first temperature detection unit 41 of the first detector Eb1, to detect the fire, it is possible to estimate the location of the source of the fire.

[0260] (2.4) Fourth Operation Example A fourth operation example of the fire alarm system 100B will be described with reference to the flowchart in Figure 7. In the fourth operation example, it is assumed that an air current is generated in the target space F2 by an air conditioning device such as an air conditioner. Therefore, the air whose temperature has risen due to a fire that has broken out in the target space F2 and the smoke generated by the fire move within the target space F2 on the air current.

[0261] First, at a first time point, an acquisition unit 51 included in each of the plurality of detectors Eb0 including detectors Eb1 to Eb12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Eb0, the gas concentration detected by the gas detection unit 10 included in each detector Eb0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Eb0. Also, at the first time point, a determination unit 52 included in each of the plurality of detectors Eb0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Eb0.

[0262] Here, it is assumed that the first detector Eb1 detects the occurrence of a fire at a first time point (step ST21). That is, it is assumed that the determination unit 52 of the detector Eb1 determines that a fire has occurred at the first time point. In the following description, the detector Eb1 that determines that a fire has occurred at the first time point may be referred to as the first detector Eb1.

[0263] More specifically, the determination unit 52 of the first detector Eb1 determines that a fire has occurred based on the fact that the first gas concentration detected by the gas detection unit 10 of the first detector Eb1 has exceeded the first gas threshold. At this time, the signal generation unit 54 generates a first fire occurrence signal indicating that the first gas concentration detected by the gas detection unit 10 of the first detector Eb1 has exceeded the first gas threshold, and transmits the first fire occurrence signal to the fire notification device 200 (step ST22). Note that, at the first time point, the determination unit 52 of the first detector Eb1 may also determine that a fire has occurred based on the fact that the first smoke concentration detected by the smoke detection unit 2 of the first detector Eb1 has exceeded the first smoke threshold. In this case, the first fire occurrence signal indicates that the first smoke concentration detected by the smoke detection unit 2 of the first detector Eb1 has exceeded the first smoke threshold. Furthermore, at the first time point, the determination unit 52 of the first detector Eb1 may determine that a fire has occurred based on the fact that the first gas concentration detected by the gas detection unit 10 of the first detector Eb1 has exceeded the first gas threshold and the first smoke concentration detected by the smoke detection unit 2 of the first detector Eb1 has exceeded the first smoke threshold. In this case, the first fire occurrence signal indicates that the first gas concentration detected by the gas detection unit 10 of the first detector Eb1 has exceeded the first gas threshold and that the first smoke concentration detected by the smoke detection unit 2 of the first detector Eb1 has exceeded the first smoke threshold.

[0264] When the target selection unit 205 of the fire notification device 200 receives the first fire occurrence signal, it selects the detector Eb0 that is located adjacent to the first detector Eb1 from among the multiple detectors Eb0. Specifically, the target selection unit 205 selects the detectors Eb2 to Eb9 that are located adjacent to the first detector Eb1 around the first detector Eb1 from among the multiple detectors Eb0 (step ST23). In the following description, the detectors Eb2 to Eb9 selected by the target selection unit 205 may be referred to as second detectors Eb2 to Eb9, respectively.

[0265] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 of the second detectors Eb2 to Eb9 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the gas detection units 10 of the second detectors Ea2 to Ea9 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration thresholds of the smoke detection units 2 of the second detectors Eb2 to Eb9 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST24). In other words, the determination units 52 of the second detectors Eb2 to Eb9 can more easily determine that a fire has occurred after the first time point.

[0266] Next, at a second time point that is later than the first time point, an acquisition unit 51 included in each of the plurality of detectors Eb0 including detectors Eb1 to Eb12 acquires the temperature detected by the plurality of temperature detection units 4 included in each detector Eb0, the gas concentration detected by the gas detection unit 10 included in each detector Eb0, and the smoke concentration detected by the smoke detection unit 2 included in each detector Eb0. Also, at the second time point, a determination unit 52 included in each of the plurality of detectors Eb0 determines whether or not a fire has occurred based on the temperature, gas concentration, and smoke concentration acquired by the acquisition unit 51 included in each detector Eb0.

[0267] Here, assume that, at a second time point, second detector Eb6 of second detectors Eb2 to Eb9 detects the occurrence of a fire (step ST25). That is, assume that, at the second time point, determination unit 52 of second detector Eb6 determines that a fire has occurred. As an example, assume that determination unit 52 of second detector Eb6 determines that a fire has occurred because the second gas concentration detected by gas detection unit 10 of second detector Eb6 has exceeded the second gas threshold. At this time, signal generation unit 54 generates a second fire occurrence signal indicating that the second gas concentration detected by gas detection unit 10 of second detector Eb6 has exceeded the second gas threshold, and transmits the second fire occurrence signal to fire notification device 200 (step ST26). The determination unit 52 of the second detector Eb6 may determine that a fire has occurred based on at least one of the following: the second temperature exceeding the second temperature threshold, the second gas concentration exceeding the second gas threshold, and the second smoke density exceeding the second smoke threshold. In other words, the second fire occurrence signal indicates at least one of the following: the second temperature exceeding the second temperature threshold, the second gas concentration exceeding the second gas threshold, and the second smoke density exceeding the second smoke threshold.

[0268] When the target selection unit 205 of the fire notification device 200 receives the second fire occurrence signal, it selects, from the multiple detectors Eb0, the detector Eb0 that is located adjacent to the first detector Eb1 on the opposite side of the second detector Eb6. Specifically, the target selection unit 205 selects, from the multiple detectors Eb0, the detector Eb0 that is located adjacent to the first detector Eb1 on the opposite side (east side) of the second detector Eb6. Here, in the present embodiment, the target selection unit 205 selects, from the multiple detectors Eb0, detectors Eb2, Eb3, and Eb9 that are located adjacent to the first detector Eb0 on the east side of the first detector Eb1 as the "detector Eb0 that is located adjacent to the first detector Eb1 on the opposite side (east side) of the second detector Eb6." Note that the target selection unit 205 may select only the sensor Eb2 that is the sensor Eb0 located adjacent to the first sensor Eb1 on the east side as viewed from the first sensor Eb1 as "the sensor Eb0 located adjacent to the first sensor Eb1 on the opposite side (east side) from the second sensor Eb6." In the following description, the second sensors Eb2, Eb3, and Eb9 selected by the target selection unit 205 may be referred to as the third sensors Eb2, Eb3, and Eb9, respectively.

[0269] Furthermore, the target selection unit 205 selects the third sensor Eb2 from among the third sensors Eb2, Eb3, and Eb9, which faces the second sensor Eb6 that detected the occurrence of the fire via the first sensor Eb1 (step ST27).

[0270] When target selection unit 205 selects third detector Eb2, notification unit 207 of fire notification device 200 generates a notification signal notifying that a fire has occurred with its origin located between first detector Eb1 and third detector Eb2, and transmits the notification signal to information terminal 300 via second communication unit 202 (step ST28). That is, notification unit 207 transmits the notification signal notifying that a fire has occurred with its origin located between first detector Eb1 and third detector Eb2 in at least one of the following cases: when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold.

[0271] Furthermore, upon receiving the second fire signal, the target selection unit 205 of the fire notification device 200 selects, from the plurality of detectors Eb0, a detector Eb0 adjacent to the second detector Eb6 other than the first detector Eb1. Specifically, the target selection unit 205 selects, from the plurality of detectors Eb0, detectors Eb4, Eb5, Eb7, Eb8, Eb10, Eb11, and Eb12, which are detectors Eb0 other than the detector Eb1 located adjacent to the second detector Eb6, around the second detector Eb6 (step ST29). Note that in the following description, the detectors Eb4, Eb5, Eb7, Eb8, Eb10, Eb11, and Eb12 selected by the target selection unit 205 may be referred to as the fourth detectors Eb4, Eb5, Eb7, Eb8, Eb10, Eb11, and Eb12, respectively.

[0272] The threshold setting unit 206 changes the temperature thresholds of the six temperature detection units 4 included in the fourth sensors Eb4, Eb5, Eb7, Eb8, Eb10, Eb11, and Eb12 from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold. The threshold setting unit 206 also changes the gas concentration thresholds of the gas detection units 10 included in the fourth sensors Eb4, Eb5, Eb7, Eb8, Eb10, Eb11, and Eb12 from the first gas threshold to a second gas threshold that is lower than the first gas threshold. The threshold setting unit 206 also changes the smoke concentration thresholds of the smoke detection units 2 included in the fourth sensors Eb4, Eb5, Eb7, Eb8, Eb10, Eb11, and Eb12 from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold (step ST30). In other words, the determination units 52 of the fourth sensors Eb4, Eb5, Eb7, Eb8, Eb10, Eb11, and Eb12 can more easily determine that a fire has occurred after the second time point.

[0273] In this way, since it is highly likely that detector Eb0 located around the first detector Eb1 that first detected the fire will be the next to detect the fire, by making it easier for detector Eb0 located around the first detector Eb1 to detect the fire, the location of the source of the fire can be estimated.

[0274] Furthermore, by making it easier for a detector Eb0 adjacent to a detector Eb0 that detected a fire after the first detector Eb1, other than the first detector Eb1, to detect a fire, it becomes easier to identify the direction of travel of the air whose temperature has risen due to the fire, and the smoke and gas that are generated as a result of the fire.

[0275] (Modifications) The embodiments of the present disclosure are not limited to the above-described embodiments. The above-described embodiments can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the above-described embodiments are listed below. The modifications described below can be applied in appropriate combinations.

[0276] The fire notification systems 100, 100A, and 100B of the present disclosure include, for example, a computer system. The computer system primarily comprises one or more processors and memory as hardware. Here, the one or more processors execute a specific program (fire notification program) recorded in the memory of the computer system to execute the fire notification method of the present disclosure. In other words, the fire notification program is a program for causing the one or more processors to execute the fire notification method of the present disclosure. The fire notification program may be pre-recorded in the memory of the computer system, provided via a telecommunications line, or provided by being recorded on a non-transitory recording medium readable by the computer system, such as a memory card, optical disk, or hard disk drive. The processor of the computer system is composed of one or more electronic circuits, including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integration (VLSIs), or ultra-large-scale integration (ULSIs). Furthermore, a field-programmable gate array (FPGA), which is programmed after the LSI is manufactured, or a logic device capable of reconfiguring the connections within the LSI or the circuit partitions within the LSI, can also be employed as a processor. Multiple electronic circuits may be integrated into a single chip or distributed across multiple chips. Multiple chips may be integrated into a single device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits, including a semiconductor integrated circuit or a large-scale integrated circuit.

[0277] In the above embodiment, the information terminal 300 has the display unit 302 and the audio output unit 303 , but the fire notification device 200 may have functions corresponding to the display unit 302 and the audio output unit 303 .

[0278] (Summary) As described above, the fire notification method of the first aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first sensor (E0) among a plurality of sensors (E0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for determining whether a fire has occurred, and a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having first temperature thresholds set therein, the first temperature being a threshold for determining whether a fire has occurred. In the threshold setting step, when a first temperature detected by one of the plurality of temperature detection units (4) possessed by the first sensor (E0) exceeds a first temperature threshold, the temperature thresholds of the plurality of temperature detection units (4) possessed by a second sensor (E0) disposed adjacent to the first sensor (E0) on the side of the one of the plurality of sensor (E0) temperature detection unit (4) are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and the smoke concentration threshold of a smoke detection unit (2) possessed by the second sensor (E0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperature detected by the plurality of temperature detection units (4) possessed by the second sensor (E0) and the second smoke concentration of the smoke detected by the smoke detection unit (2) possessed by the second sensor (E0) are acquired. In the notification step, when the second temperature exceeds the second temperature threshold and / or when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred with its source located between the first detector (E0) and the second detector (E0).

[0279] According to this aspect, the location of the source of the fire can be estimated.

[0280] The fire notification method of the second aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. In the first acquisition step, a first temperature detected by a plurality of temperature detection units (4) of a first detector (E0) among a plurality of detectors (E0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for determining whether a fire has occurred, and a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having first temperature thresholds set therein, the first temperature being a threshold for determining whether a fire has occurred, is acquired, and a first smoke density of the smoke detected by the smoke detection unit (2) of the first detector (E0) is acquired. In the threshold setting step, when the first smoke density detected by the smoke detection unit (2) of the first detector (E0) exceeds the first smoke threshold, the temperature thresholds of the plurality of temperature detection units (4) of the second detector (E0) arranged adjacent to the first detector (E0) among the plurality of detectors (E0) are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and the smoke density threshold of the smoke detection unit (2) of the second detector (E0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperature detected by the plurality of temperature detection units (4) of the second detector (E0) and the second smoke density of the smoke detected by the smoke detection unit (2) of the second detector (E0) are acquired. In the notification step, when the second temperature exceeds the second temperature threshold and / or when the second smoke concentration exceeds the second smoke threshold, a notification is issued that a fire has occurred with its source located between the first detector (E0) and the second detector (E0).

[0281] According to this aspect, the location of the source of the fire can be estimated.

[0282] The fire notification method of the third aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (E0) among a plurality of detectors (E0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for determining whether a fire has occurred, and a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having first temperature thresholds set therein, the first temperature being a threshold for determining whether a fire has occurred. In the threshold setting step, when a first temperature detected by one of the plurality of temperature detection units (4) possessed by the first sensor (E0) exceeds a first temperature threshold, the temperature thresholds of the plurality of temperature detection units (4) possessed by a second sensor (E0) disposed adjacent to the first sensor (E0) on the opposite side of the one of the plurality of sensor (E0) to the one of the plurality of sensor (E0) are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and the smoke concentration threshold of the smoke detection unit (2) possessed by the second sensor (E0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperature detected by the plurality of temperature detection units (4) possessed by the second sensor (E0) and the second smoke concentration of the smoke detected by the smoke detection unit (2) possessed by the second sensor (E0) are acquired. In the notification step, when the second temperature exceeds the second temperature threshold and / or when the second smoke concentration exceeds the second smoke threshold, notification is given that a fire has occurred originating at a position between the first detector (E0) and a third detector (E0) that is arranged adjacent to the first detector (E0) on the side of one of the temperature detection units (4) of the multiple detectors (E0).

[0283] According to this aspect, the location of the source of the fire can be estimated.

[0284] The fire notification method of the fourth aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. In the first acquisition step, a first temperature detected by a plurality of temperature detection units (4) of a first sensor (E0) among a plurality of sensors (E0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, and a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having first temperature thresholds set therein, the first temperature detected by the plurality of temperature detection units (4) of the first sensor (E0) and a first smoke concentration of the smoke detected by the smoke detection unit (2) of the first sensor (E0) are acquired. In the threshold setting step, when a first smoke density detected by the smoke detection unit (2) of the first detector (E0) exceeds a first smoke threshold, the temperature thresholds of the plurality of temperature detection units (4) of the plurality of second detectors (E0) arranged adjacent to the first detector (E0) among the plurality of detectors (E0) are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and the smoke density thresholds of the smoke detection units (2) of the plurality of second detectors (E0) are changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, the second temperatures detected by the plurality of temperature detection units (4) of the plurality of second detectors (E0) and the second smoke density of the smoke detected by the smoke detection units (2) of the plurality of second detectors (E0) are acquired. In the notification step, when the second temperature detected by the plurality of temperature detection units (4) of one of the plurality of second detectors (E0) exceeds the second temperature threshold, and / or when the second smoke concentration detected by the smoke detection unit (2) of one of the second detectors (E0) exceeds the second smoke threshold, notification is given that a fire has occurred originating at a position between the first detector (E0) and a third detector (E0) located adjacent to the first detector (E0) on the opposite side of one of the plurality of second detectors (E0).

[0285] According to this aspect, the location of the source of the fire can be estimated.

[0286] A fifth aspect of the fire notification method of the fourth aspect further includes a second threshold setting step in addition to the first threshold setting step, which is a threshold setting step. In the second threshold setting step, when at least one of the second temperature and the second smoke density exceeds the second smoke threshold, temperature thresholds of a plurality of temperature detection units (4) included in a fourth detector (E0) adjacent to a second detector (E0) other than the first detector (E0) among the plurality of detectors (E0) are changed from the first temperature threshold to the second temperature threshold, and a smoke density threshold of a smoke detection unit (2) included in the fourth detector (E0) is changed from the first smoke threshold to the second smoke threshold.

[0287] According to this aspect, it becomes easier to identify the direction of travel of the air whose temperature has risen due to the fire and the smoke generated by the fire.

[0288] The fire notification method of the sixth aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Ea0) among a plurality of detectors (Ea0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a plurality of gas detection units (10) arranged around the smoke detection unit (2) and having a first gas threshold set therein, the first smoke concentration of smoke detected by the smoke detection unit (2) of the first detector (Ea0), and a first gas concentration of gas detected by the plurality of gas detection units (10) of the first detector (Ea0). In the threshold setting step, when a first temperature detected by one of the plurality of temperature detection units (4) possessed by the first sensor (Ea0) exceeds a first temperature threshold, the temperature threshold of the plurality of temperature detection units (4) possessed by the second sensor (Ea0) arranged adjacent to the first sensor (Ea0) on the side of the one of the plurality of temperature detection units (4) possessed by the second sensor (Ea0) is changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration threshold of the plurality of gas detection units (10) possessed by the second sensor (Ea0) is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit (2) possessed by the second sensor (Ea0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) of the second sensor (Ea0), a second gas concentration detected by the plurality of gas detection units (10) of the second sensor (Ea0), and a second smoke concentration of smoke detected by the smoke detection unit (2) of the second sensor (Ea0) are acquired. In the notification step, in at least one of the cases where the second temperature exceeds a second temperature threshold, where the second gas concentration exceeds a second gas threshold, and where the second smoke concentration exceeds a second smoke threshold, notification is given that a fire has occurred with its origin located between the first sensor (Ea0) and the second sensor (Ea0).

[0289] According to this aspect, the location of the source of the fire can be estimated.

[0290] The fire notification method of the seventh aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Ea0) among a plurality of detectors (Ea0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a plurality of gas detection units (10) arranged around the smoke detection unit (2) and having a first gas threshold set therein, the first smoke concentration of smoke detected by the smoke detection unit (2) of the first detector (Ea0), and a first gas concentration of gas detected by the plurality of gas detection units (10) of the first detector (Ea0). In the threshold setting step, when the first gas concentration detected by one gas detection unit (10) of the plurality of gas detection units (10) possessed by the first sensor (Ea0) exceeds the first gas threshold, the temperature threshold of the plurality of temperature detection units (4) possessed by the second sensor (Ea0) arranged adjacent to the first sensor (Ea0) on the side of the one gas detection unit (10) of the plurality of sensors (Ea0) is changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration threshold of the plurality of gas detection units (10) possessed by the second sensor (Ea0) is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit (2) possessed by the second sensor (Ea0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) of the second sensor (Ea0), a second gas concentration detected by the plurality of gas detection units (10) of the second sensor (Ea0), and a second smoke concentration of smoke detected by the smoke detection unit (2) of the second sensor (Ea0) are acquired. In the notification step, in at least one of the cases where the second temperature exceeds a second temperature threshold, where the second gas concentration exceeds a second gas threshold, and where the second smoke concentration exceeds a second smoke threshold, notification is given that a fire has occurred with its origin located between the first sensor (Ea0) and the second sensor (Ea0).

[0291] According to this aspect, the location of the source of the fire can be estimated.

[0292] The fire notification method of the eighth aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Ea0) among a plurality of detectors (Ea0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a plurality of gas detection units (10) arranged around the smoke detection unit (2) and having a first gas threshold set therein, the first smoke concentration of smoke detected by the smoke detection unit (2) of the first detector (Ea0), and a first gas concentration of gas detected by the plurality of gas detection units (10) of the first detector (Ea0). In the threshold setting step, when the first smoke concentration detected by the smoke detection unit (2) of the first detector (Ea0) exceeds the first smoke threshold, the temperature threshold of the plurality of temperature detection units (4) of the second detector (Ea0) arranged adjacent to the first detector (Ea0) among the plurality of detectors (Ea0) is changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration threshold of the plurality of gas detection units (10) of the second detector (Ea0) is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit (2) of the second detector (Ea0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) of the second sensor (Ea0), a second gas concentration detected by the plurality of gas detection units (10) of the second sensor (Ea0), and a second smoke concentration of smoke detected by the smoke detection unit (2) of the second sensor (Ea0) are acquired. In the notification step, in at least one of the cases where the second temperature exceeds a second temperature threshold, where the second gas concentration exceeds a second gas threshold, and where the second smoke concentration exceeds a second smoke threshold, notification is given that a fire has occurred with its origin located between the first sensor (Ea0) and the second sensor (Ea0).

[0293] According to this aspect, the location of the source of the fire can be estimated.

[0294] A ninth aspect of the fire notification method includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Ea0) among a plurality of detectors (Ea0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a plurality of gas detection units (10) arranged around the smoke detection unit (2) and having a first gas threshold set therein, the first smoke concentration of smoke detected by the smoke detection unit (2) of the first detector (Ea0), and a first gas concentration of gas detected by the plurality of gas detection units (10) of the first detector (Ea0). In the threshold setting step, when a first temperature detected by one of the plurality of temperature detection units (4) possessed by the first sensor (Ea0) exceeds a first temperature threshold, the temperature threshold of the plurality of temperature detection units (4) possessed by the second sensor (Ea0), which is arranged adjacent to the first sensor (Ea0) on the opposite side of the one of the plurality of temperature detection units (4) possessed by the first sensor (Ea0), is changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration threshold of the plurality of gas detection units (10) possessed by the second sensor (Ea0) is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit (2) possessed by the second sensor (Ea0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) of the second sensor (Ea0), a second gas concentration detected by the plurality of gas detection units (10) of the second sensor (Ea0), and a second smoke concentration of smoke detected by the smoke detection unit (2) of the second sensor (Ea0) are acquired. In the notification step, in at least one of the cases where the second temperature exceeds a second temperature threshold, where the second gas concentration exceeds a second gas threshold, and where the second smoke concentration exceeds a second smoke threshold, notification is given that a fire has occurred originating at a position between the first sensor (Ea0) and a third sensor (Ea0) arranged adjacent to the first sensor (Ea0) on the side of one temperature detection unit (4) of the plurality of sensors (Ea0).

[0295] According to this aspect, the location of the source of the fire can be estimated.

[0296] A tenth aspect of the fire notification method includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Ea0) among a plurality of detectors (Ea0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a plurality of gas detection units (10) arranged around the smoke detection unit (2) and having a first gas threshold set therein, the first smoke concentration of smoke detected by the smoke detection unit (2) of the first detector (Ea0), and a first gas concentration of gas detected by the plurality of gas detection units (10) of the first detector (Ea0). In the threshold setting step, when a first gas concentration detected by one gas detection unit (10) among the plurality of gas detection units (10) possessed by the first sensor (Ea0) exceeds a first gas threshold, the temperature threshold of the plurality of temperature detection units (4) possessed by the second sensor (Ea0), which is arranged adjacent to the first sensor (Ea0) on the opposite side of the one gas detection unit (10) among the plurality of sensors (Ea0), is changed from a first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration threshold of the plurality of gas detection units (10) possessed by the second sensor (Ea0) is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit (2) possessed by the second sensor (Ea0) is changed from a first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) possessed by the second sensor (Ea0), a second gas concentration detected by the plurality of gas detection units (10) possessed by the second sensor (Ea0), and a second smoke concentration of smoke detected by the smoke detection unit (2) possessed by the second sensor (Ea0) are acquired.In the notification step, when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, and when the second smoke concentration exceeds the second smoke threshold, notification is given that a fire has occurred with its source located between the first detector (Ea0) and a third detector (Ea0) that is positioned adjacent to the first detector (Ea0) on the side of one gas detection unit (10) of the multiple detectors (Ea0).

[0297] According to this aspect, the location of the source of the fire can be estimated.

[0298] The fire notification method of an eleventh aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Ea0) among a plurality of detectors (Ea0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a plurality of gas detection units (10) arranged around the smoke detection unit (2) and having a first gas threshold set therein, the first smoke concentration of smoke detected by the smoke detection unit (2) of the first detector (Ea0), and a first gas concentration of gas detected by the plurality of gas detection units (10) of the first detector (Ea0). In the threshold setting step, when the first smoke concentration detected by the smoke detection unit (2) of the first detector (Ea0) exceeds the first smoke threshold, the temperature thresholds of the plurality of temperature detection units (4) of the plurality of second detectors (Ea0) arranged adjacent to the first detector (Ea0) among the plurality of detectors (Ea0) are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the plurality of gas detection units (10) of the plurality of second detectors (Ea0) are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration thresholds of the smoke detection units (2) of the plurality of second detectors (Ea0) are changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) respectively possessed by the plurality of second sensors (Ea0), a second gas concentration detected by the plurality of gas detection units (10) respectively possessed by the plurality of second sensors (Ea0), and a second smoke concentration of smoke detected by the smoke detection units (2) respectively possessed by the plurality of second sensors (Ea0) are acquired.In the notification step, in at least one of the cases where the second temperature detected by the plurality of temperature detection units (4) of one of the plurality of second detectors (Ea0) exceeds the second temperature threshold, where the second gas concentration detected by the plurality of gas detection units (10) of one of the second detectors (Ea0) exceeds the second gas threshold, and where the second smoke concentration detected by the smoke detection unit (2) of one of the second detectors (Ea0) exceeds the second smoke threshold, notification is given that a fire has occurred originating at a position between the first detector (Ea0) and a third detector (Ea0) located adjacent to the first detector (Ea0) on the opposite side of one of the plurality of second detectors (Ea0).

[0299] According to this aspect, the location of the source of the fire can be estimated.

[0300] A twelfth aspect of the fire notification method of the eleventh aspect further includes a second threshold setting step in addition to the first threshold setting step, which is a threshold setting step. In the second threshold setting step, when at least one of the following occurs: the second temperature exceeds the second temperature threshold; the second gas concentration exceeds the second gas threshold; and the second smoke concentration exceeds the second smoke threshold, temperature detection thresholds of multiple temperature detection units (4) included in a fourth sensor (Ea0) adjacent to a second sensor (Ea0) other than the first sensor (Ea0) among the multiple sensors (Ea0) are changed from the first temperature threshold to the second temperature threshold; the gas concentration detection thresholds of multiple gas detection units (10) included in the fourth sensor (Ea0) are changed from the first gas threshold to the second gas threshold; and the smoke concentration threshold of the smoke detection unit (2) included in the fourth sensor (Ea0) is changed from the first smoke threshold to the second smoke threshold.

[0301] According to this aspect, it becomes easier to identify the traveling direction of the air whose temperature has risen due to the fire, and the smoke and gas generated by the fire.

[0302] A fire notification method of a thirteenth aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Eb0) among a plurality of detectors (Eb0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a gas detection unit (10) having a first gas threshold being a threshold for gas concentration serving as a criterion for determining whether a fire has occurred. In the threshold setting step, when a first temperature detected by one of the plurality of temperature detection units (4) possessed by the first sensor (Eb0) exceeds a first temperature threshold, the temperature threshold of the plurality of temperature detection units (4) possessed by the second sensor (Eb0), which is arranged adjacent to the first sensor (Eb0) on the side of the one of the plurality of temperature detection units (4) possessed by the second sensor (Eb0), is changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration threshold of the gas detection unit (10) possessed by the second sensor (Eb0) is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit (2) possessed by the second sensor (Eb0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) of the second sensor (Eb0), a second gas concentration detected by the gas detection unit (10) of the second sensor (Eb0), and a second smoke concentration of smoke detected by the smoke detection unit (2) of the second sensor (Eb0) are acquired. In the notification step, when the second temperature exceeds a second temperature threshold, when the second gas concentration exceeds a second gas threshold, and when the second smoke concentration exceeds a second smoke threshold, notification is given that a fire has occurred with its origin located between the first sensor (Eb0) and the second sensor (Eb0).

[0303] According to this aspect, the location of the source of the fire can be estimated.

[0304] A fire notification method of a fourteenth aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Eb0) among a plurality of detectors (Eb0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a gas detection unit (10) having a first gas threshold being a threshold for gas concentration serving as a criterion for determining whether a fire has occurred. In the threshold setting step, when the first smoke concentration detected by the smoke detection unit (2) of the first detector (Eb0) exceeds the first smoke threshold, and / or when the first gas concentration detected by the gas detection unit (10) of the first detector (Eb0) exceeds the first gas threshold, the temperature threshold of the plurality of temperature detection units (4) of a second detector (Eb0) arranged adjacent to the first detector (Eb0) among the plurality of detectors (Eb0) is changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the concentration threshold of the gas detection unit (10) of the second detector (Eb0) is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit (2) of the second detector (Eb0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) of the second sensor (Eb0), a second gas concentration detected by the gas detection unit (10) of the second sensor (Eb0), and a second smoke concentration of smoke detected by the smoke detection unit (2) of the second sensor (Eb0) are acquired. In the notification step, when the second temperature exceeds a second temperature threshold, when the second gas concentration exceeds a second gas threshold, or when the second smoke concentration exceeds a second smoke threshold, notification is given that a fire has occurred with its origin located between the first sensor (Eb0) and the second sensor (Eb0).

[0305] According to this aspect, the location of the source of the fire can be estimated.

[0306] A fire notification method of a fifteenth aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Eb0) among a plurality of detectors (Eb0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a gas detection unit (10) having a first gas threshold being a threshold for gas concentration serving as a criterion for determining whether a fire has occurred. In the threshold setting step, when a first temperature detected by one of the plurality of temperature detection units (4) possessed by the first sensor (Eb0) exceeds a first temperature threshold, the temperature threshold of the plurality of temperature detection units (4) possessed by the second sensor (Eb0), which is arranged adjacent to the first sensor (Eb0) on the opposite side of the one of the plurality of temperature detection units (4) possessed by the second sensor (Eb0), is changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the concentration threshold of the gas detection unit (10) possessed by the second sensor (Eb0) is changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration threshold of the smoke detection unit (2) possessed by the second sensor (Eb0) is changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by the plurality of temperature detection units (4) of the second sensor (Eb0), a second gas concentration detected by the gas detection unit (10) of the second sensor (Eb0), and a second smoke concentration of smoke detected by the smoke detection unit (2) of the second sensor (Eb0) are acquired. In the notification step, in at least one of the cases where the second temperature exceeds a second temperature threshold, where the second gas concentration exceeds the second gas threshold, and where the second smoke concentration exceeds the second smoke threshold, notification is given that a fire has occurred originating at a position between the first sensor (Eb0) and a third sensor (Eb0) arranged adjacent to the first sensor (Eb0) on the side of one temperature detection unit (4) of the plurality of sensors (Eb0).

[0307] According to this aspect, the location of the source of the fire can be estimated.

[0308] A fire notification method of a sixteenth aspect includes a first acquisition step, a threshold setting step, a second acquisition step, and a notification step. The first acquisition step acquires a first temperature detected by a plurality of temperature detection units (4) of a first detector (Eb0) among a plurality of detectors (Eb0) including a smoke detection unit (2) having a first smoke threshold set therein, the first smoke threshold being a threshold for smoke concentration serving as a criterion for determining whether a fire has occurred, a plurality of temperature detection units (4) arranged around the smoke detection unit (2) and having a first temperature threshold set therein, the first temperature threshold being a threshold for temperature serving as a criterion for determining whether a fire has occurred, and a gas detection unit (10) having a first gas threshold being a threshold for gas concentration serving as a criterion for determining whether a fire has occurred. In the threshold setting step, when the first smoke concentration detected by the smoke detection unit (2) of the first detector (Eb0) exceeds the first smoke threshold, and / or when the first gas concentration detected by the gas detection unit (10) of the first detector (Eb0) exceeds the first gas threshold, the temperature thresholds of the plurality of temperature detection units (4) of the plurality of second detectors (Eb0) arranged adjacent to the first detector (Eb0) among the plurality of detectors (Eb0) are changed from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, the gas concentration thresholds of the gas detection units (10) of the plurality of second detectors (Eb0) are changed from the first gas threshold to a second gas threshold lower than the first gas threshold, and the smoke concentration thresholds of the smoke detection units (2) of the plurality of second detectors (Eb0) are changed from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. In the second acquisition step, a second temperature detected by a plurality of temperature detection units (4) respectively possessed by a plurality of second sensors (Eb0), a second gas concentration detected by a gas detection unit (10) respectively possessed by a plurality of second sensors (Eb0), and a second smoke concentration of smoke detected by a smoke detection unit (2) respectively possessed by a plurality of second sensors (Eb0) are acquired.In the notification step, in at least one of the cases where the second temperature detected by the plurality of temperature detection units (4) of one of the plurality of second detectors (Eb0) exceeds the second temperature threshold, where the second gas concentration detected by the gas detection unit (10) of one of the second detectors (Eb0) exceeds the second gas threshold, and where the second smoke concentration detected by the smoke detection unit (2) of one of the second detectors (Eb0) exceeds the second smoke threshold, notification is given that a fire has occurred originating at a position between the first detector (Eb0) and a third detector (Eb0) located adjacent to the first detector (Eb0) on the opposite side of one of the plurality of detectors (Eb0).

[0309] According to this aspect, the location of the source of the fire can be estimated.

[0310] A seventeenth aspect of the fire notification method further includes a second threshold setting step in addition to the first threshold setting step, which is the threshold setting step in the sixteenth aspect. In the second threshold setting step, when at least one of the following occurs: the second temperature exceeds the second temperature threshold; the second gas concentration exceeds the second gas threshold; and the second smoke concentration exceeds the second smoke threshold, temperature thresholds of a plurality of temperature detection units (4) included in a fourth detector (Eb0) adjacent to a second detector (Eb0) other than the first detector (Eb0) among the plurality of detectors (Eb0) are changed from the first temperature threshold to the second temperature threshold; the gas concentration threshold of a gas detection unit (10) included in the fourth detector (Eb0) is changed from the first gas threshold to the second gas threshold; and the smoke concentration threshold of a smoke detection unit (2) included in the fourth detector (Eb0) is changed from the first smoke threshold to the second smoke threshold.

[0311] According to this aspect, it becomes easier to identify the traveling direction of the air whose temperature has risen due to the fire, and the smoke and gas generated by the fire.

[0312] In the fire notification method of the eighteenth aspect, in any one of the sixth to seventeenth aspects, the gas is carbon monoxide gas.

[0313] According to this aspect, safety can be improved.

[0314] A nineteenth aspect of the program is a program for causing one or more processors to execute the fire notification method of any one of the first to eighteenth aspects.

[0315] According to this aspect, the location of the source of the fire can be estimated.

[0316] A fire notification system according to a twentieth aspect includes one or more processors that execute the program according to the nineteenth aspect.

[0317] According to this aspect, the location of the source of the fire can be estimated.

[0318] The detector (E0, Ea0, Eb0) of the 21st aspect is included in the plurality of detectors (E0, Ea0, Eb0) used in the fire notification method of any one of the first to eighteenth aspects.

[0319] According to this aspect, the location of the source of the fire can be estimated.

[0320] 2 Smoke detection unit 4 Temperature detection unit 10 Gas detection unit E0 Detector Ea0 Detector Eb0 Detector

Claims

1. A first acquisition step of acquiring a first temperature detected by a first of a plurality of temperature detection units of a first detector among a plurality of detectors, the first temperature detection unit being set with a first smoke threshold, which is a threshold of smoke concentration used as a criterion for determining whether a fire has occurred, and a plurality of temperature detection units arranged around the smoke detection unit and each having a first temperature threshold, which is a temperature threshold used as a criterion for determining whether a fire has occurred; and a first smoke concentration of smoke detected by the smoke detection units of the first detector. When the first temperature detected by one of the plurality of temperature detection units of the first detector exceeds the first temperature threshold, a threshold setting step of changing the temperature threshold of the plurality of temperature detection units of a second detector arranged adjacent to the first detector on the side of the one of the plurality of detectors from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and changing the smoke concentration threshold of the smoke detection unit of the second detector from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. A fire notification method comprising: a second acquisition step of acquiring a second temperature detected by the plurality of temperature detection units of the second sensor and a second smoke density of the smoke detected by the smoke detection unit of the second sensor; and a notification step of notifying that a fire has occurred with its origin at a position between the first sensor and the second sensor when the second temperature exceeds the second temperature threshold and / or when the second smoke density exceeds the second smoke threshold.

2. A first acquisition step of acquiring a first temperature detected by a first of a plurality of temperature detection units of a first detector among a plurality of detectors, the first temperature detection units being set with a first smoke threshold, which is a threshold of smoke concentration that serves as a criterion for determining whether a fire has occurred, and a plurality of temperature detection units that are arranged around the smoke detection unit and are set with a first temperature threshold, which is a temperature threshold that serves as a criterion for determining whether a fire has occurred; and a threshold setting step of changing, when the first smoke concentration detected by the smoke detection unit of the first detector exceeds the first smoke threshold, the temperature threshold of the plurality of temperature detection units of a second detector arranged adjacent to the first detector among the plurality of detectors from the first temperature threshold to a second temperature threshold that is lower than the first temperature threshold, and changing the smoke concentration threshold of the smoke detection unit of the second detector from the first smoke threshold to a second smoke threshold that is lower than the first smoke threshold. A fire notification method comprising: a second acquisition step of acquiring a second temperature detected by the plurality of temperature detection units of the second sensor and a second smoke density of the smoke detected by the smoke detection unit of the second sensor; and a notification step of notifying that a fire has occurred with its origin at a position between the first sensor and the second sensor when the second temperature exceeds the second temperature threshold and / or when the second smoke density exceeds the second smoke threshold.

3. A first acquisition step of acquiring a first temperature detected by a plurality of temperature detection units of a first detector among a plurality of detectors, the first temperature detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for determining whether a fire has occurred, and a plurality of temperature detection units arranged around the smoke detection unit and each having a first temperature threshold set therein, the first temperature detection unit being a threshold for determining whether a fire has occurred; and a threshold setting step of changing, when the first temperature detected by one of the plurality of temperature detection units of the first detector exceeds the first temperature threshold, the temperature threshold of the plurality of temperature detection units of a second detector arranged adjacent to the first detector on the opposite side to the one temperature detection unit of the plurality of detectors from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and changing the smoke concentration threshold of the smoke detection unit of the second detector from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. A fire notification method comprising: a second acquisition step of acquiring a second temperature detected by the plurality of temperature detection units of the second sensor and a second smoke density of the smoke detected by the smoke detection unit of the second sensor; and a notification step of notifying that a fire has occurred originating at a position between the first sensor and a third sensor located adjacent to the first sensor on the side of the one temperature detection unit of the plurality of sensors when the second temperature exceeds the second temperature threshold and / or when the second smoke density exceeds the second smoke threshold.

4. A first acquisition step of acquiring a first temperature detected by a first detector among a plurality of detectors, the first detector having a smoke detection unit having a first smoke threshold set thereto, which is a threshold of smoke concentration used as a criterion for determining whether a fire has occurred, and a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set thereto, which is a temperature threshold used as a criterion for determining whether a fire has occurred; and a first smoke density of the smoke detected by the smoke detection units of the first detector; and a threshold setting step of changing, when the first smoke density detected by the smoke detection unit of the first detector exceeds the first smoke threshold, the temperature thresholds of the temperature detection units of a plurality of second detectors arranged adjacent to the first detector among the plurality of detectors from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, and changing the smoke density threshold of the smoke detection units of the plurality of second detectors from the first smoke threshold to a second smoke threshold lower than the first smoke threshold. a second acquisition step of acquiring a second temperature detected by the plurality of temperature detection units possessed by each of the plurality of second detectors and a second smoke density of the smoke detected by the smoke detection unit possessed by each of the plurality of second detectors; and a notification step of notifying that a fire has occurred originating at a position between the first detector and a third detector, the third detector being disposed adjacent to the one second detector on the opposite side of the one second detector among the plurality of detectors, when at least one of the cases where the second temperature detected by the plurality of temperature detection units possessed by one second detector among the plurality of second detectors exceeds the second temperature threshold and the second smoke density detected by the smoke detection unit possessed by the one second detector exceeds the second smoke threshold.

5. A fire notification method as described in claim 4, further comprising, in addition to the first threshold setting step which is the threshold setting step, a second threshold setting step of changing the temperature thresholds of the plurality of temperature detection units possessed by a fourth detector adjacent to the one second detector other than the first detector among the plurality of detectors from the first temperature threshold to the second temperature threshold when the second temperature exceeds the second temperature threshold and / or when the second smoke density exceeds the second smoke threshold, and changing the smoke density threshold of the smoke detection unit possessed by the fourth detector from the first smoke threshold to the second smoke threshold.

6. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit having a first smoke threshold set therein, which is a threshold for smoke concentration that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, which is a threshold for temperature that serves as a criterion for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold set therein, which is a threshold for gas concentration that serves as a criterion for determining whether a fire has occurred; a threshold setting step of, when the first temperature detected by one of the plurality of temperature detection units possessed by the first sensor exceeds the first temperature threshold, changing the temperature thresholds of the plurality of temperature detection units possessed by a second sensor arranged adjacent to the first sensor on the side of the one of the plurality of sensor from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the gas concentration thresholds of the plurality of gas detection units possessed by the second sensor from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke concentration threshold of the smoke detection unit possessed by the second sensor from the first smoke threshold to a second smoke threshold lower than the first smoke threshold; a second acquisition step of acquiring the second temperature detected by the plurality of temperature detection units possessed by the second sensor, the second gas concentration detected by the plurality of gas detection units possessed by the second sensor, and the second smoke concentration of the smoke detected by the smoke detection unit possessed by the second sensor; a notification step of notifying that a fire has occurred originating at a position between the first detector and the second detector in at least one of the cases where the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

7. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for the concentration of smoke that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for the temperature that serves as a criterion for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for the concentration of gas that serves as a criterion for determining whether a fire has occurred, a first smoke concentration of smoke detected by the smoke detection unit possessed by the first detector, and a first gas concentration of gas detected by the plurality of gas detection units possessed by the first detector; a threshold setting step of, when the first gas concentration detected by one gas detection unit among the plurality of gas detection units possessed by the first detector exceeds the first gas threshold, changing the temperature thresholds of the plurality of temperature detection units possessed by a second detector disposed adjacent to the first detector on the side of the one gas detection unit among the plurality of detectors from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the gas concentration thresholds of the plurality of gas detection units possessed by the second detector from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke concentration threshold of the smoke detection unit possessed by the second detector from the first smoke threshold to a second smoke threshold lower than the first smoke threshold; a second acquisition step of acquiring the second temperatures detected by the plurality of temperature detection units possessed by the second detector, the second gas concentrations detected by the plurality of gas detection units possessed by the second detector, and a second smoke concentration of the smoke detected by the smoke detection unit possessed by the second detector; a notification step of notifying that a fire has occurred originating at a position between the first detector and the second detector in at least one of the cases where the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

8. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit having a first smoke threshold set therein, which is a threshold for smoke concentration that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, which is a threshold for temperature that serves as a criterion for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold set therein, which is a threshold for gas concentration that serves as a criterion for determining whether a fire has occurred; a threshold setting step of changing the temperature thresholds of the plurality of temperature detection units of a second detector arranged adjacent to the first detector from the first temperature threshold to a second temperature threshold lower than the first temperature threshold when the first smoke density detected by the smoke detection unit of the first detector exceeds the first smoke threshold, changing the gas concentration thresholds of the plurality of gas detection units of the second detector from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke density threshold of the smoke detection unit of the second detector from the first smoke threshold to a second smoke threshold lower than the first smoke threshold; a second acquisition step of acquiring the second temperatures detected by the plurality of temperature detection units of the second detector, the second gas concentrations detected by the plurality of gas detection units of the second detector, and the second smoke density of the smoke detected by the smoke detection unit of the second detector; a notification step of notifying that a fire has occurred originating at a position between the first detector and the second detector in at least one of the cases where the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

9. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for the concentration of smoke that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for the temperature that serves as a criterion for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for the concentration of gas that serves as a criterion for determining whether a fire has occurred, a first smoke concentration of smoke detected by the smoke detection unit possessed by the first detector, and a first gas concentration of gas detected by the plurality of gas detection units possessed by the first detector; a threshold setting step of, when the first temperature detected by one temperature detection unit of the plurality of temperature detection units of the first sensor exceeds the first temperature threshold, changing the temperature thresholds of the plurality of temperature detection units of a second sensor arranged adjacent to the first sensor on the opposite side of the one temperature detection unit of the plurality of sensors from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the gas concentration thresholds of the plurality of gas detection units of the second sensor from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke concentration threshold of the smoke detection unit of the second sensor from the first smoke threshold to a second smoke threshold lower than the first smoke threshold; a second acquisition step of acquiring the second temperature detected by the plurality of temperature detection units of the second sensor, the second gas concentration detected by the plurality of gas detection units of the second sensor, and the second smoke concentration of the smoke detected by the smoke detection unit of the second sensor; a notification step of notifying that a fire has occurred originating at a position between the first detector and a third detector, the third detector being disposed adjacent to the first detector on the side of the temperature detection unit of the one of the plurality of detectors, in at least one of the cases where the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

10. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for the concentration of smoke that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for the temperature that serves as a criterion for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for the concentration of gas that serves as a criterion for determining whether a fire has occurred, a first smoke concentration of smoke detected by the smoke detection unit possessed by the first detector, and a first gas concentration of gas detected by the plurality of gas detection units possessed by the first detector; a threshold setting step of, when the first gas concentration detected by one gas detection unit among the plurality of gas detection units possessed by the first detector exceeds the first gas threshold, changing the temperature thresholds of the plurality of temperature detection units possessed by a second detector disposed adjacent to the first detector on the opposite side of the one gas detection unit among the plurality of detectors from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the gas concentration thresholds of the plurality of gas detection units possessed by the second detector from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke concentration threshold of the smoke detection unit possessed by the second detector from the first smoke threshold to a second smoke threshold lower than the first smoke threshold; a second acquisition step of acquiring the second temperatures detected by the plurality of temperature detection units possessed by the second detector, the second gas concentrations detected by the plurality of gas detection units possessed by the second detector, and a second smoke concentration of the smoke detected by the smoke detection unit possessed by the second detector; a notification step of notifying that a fire has occurred originating at a position between the first detector and a third detector, the third detector being disposed adjacent to the first detector on the side of the one gas detection unit of the plurality of detectors, in at least one of the cases where the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

11. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit having a first smoke threshold set therein, the first temperature threshold being a threshold for the concentration of smoke that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, the first temperature threshold being a threshold for the temperature that serves as a criterion for determining whether a fire has occurred, and a plurality of gas detection units arranged around the smoke detection unit and having a first gas threshold being a threshold for the concentration of gas that serves as a criterion for determining whether a fire has occurred; a threshold setting step of, when the first smoke density detected by the smoke detection unit of the first detector exceeds the first smoke threshold, changing the temperature thresholds of the temperature detection units of each of a plurality of second detectors disposed adjacent to the first detector from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the gas concentration thresholds of the gas detection units of each of the plurality of second detectors from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke density thresholds of the smoke detection units of each of the plurality of second detectors from the first smoke threshold to a second smoke threshold lower than the first smoke threshold; a second acquisition step of acquiring the second temperatures detected by the temperature detection units of each of the plurality of second detectors, the second gas concentrations detected by the gas detection units of each of the plurality of second detectors, and the second smoke density of the smoke detected by the smoke detection units of each of the plurality of second detectors; and a notification step of notifying that a fire has occurred originating at a position between the first detector and a third detector disposed adjacent to the first detector on the opposite side of the one second detector among the plurality of second detectors, in at least one of the cases where the second temperature detected by the plurality of temperature detection units possessed by one second detector among the plurality of second detectors exceeds the second temperature threshold, where the second gas concentration detected by the plurality of gas detection units possessed by the one second detector exceeds the second gas threshold, and where the second smoke concentration detected by the smoke detection unit possessed by the one second detector exceeds the second smoke threshold.Fire notification methods.

12. A fire notification method as claimed in claim 11, further comprising, in addition to the first threshold setting step which is the threshold setting step, a second threshold setting step of changing the temperature detection thresholds of the plurality of temperature detection units possessed by a fourth detector adjacent to the one second detector other than the first detector from the first temperature threshold to the second temperature threshold, changing the gas concentration detection thresholds of the plurality of gas detection units possessed by the fourth detector from the first gas threshold to the second gas threshold, and changing the smoke concentration threshold of the smoke detection unit possessed by the fourth detector from the first smoke threshold to the second smoke threshold, in at least one of the cases where the second temperature exceeds the second temperature threshold, where the second gas concentration exceeds the second gas threshold, and where the second smoke concentration exceeds the second smoke threshold.

13. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit in which a first smoke threshold is set, which is a threshold for smoke concentration that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and in which a first temperature threshold is set, which is a threshold for temperature that serves as a criterion for determining whether a fire has occurred, and a gas detection unit in which a first gas threshold is set, which is a threshold for gas concentration that serves as a criterion for determining whether a fire has occurred; a threshold setting step of, when the first temperature detected by one of the plurality of temperature detection units possessed by the first sensor exceeds the first temperature threshold, changing the temperature thresholds of the plurality of temperature detection units possessed by a second sensor arranged adjacent to the first sensor on the side of the one of the plurality of sensor from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the gas concentration threshold of the gas detection unit possessed by the second sensor from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke concentration threshold of the smoke detection unit possessed by the second sensor from the first smoke threshold to a second smoke threshold lower than the first smoke threshold; a second acquisition step of acquiring the second temperature detected by the plurality of temperature detection units possessed by the second sensor, the second gas concentration detected by the gas detection unit possessed by the second sensor, and the second smoke concentration of the smoke detected by the smoke detection unit possessed by the second sensor; a notification step of notifying that a fire has occurred originating at a position between the first detector and the second detector in at least one of the cases where the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

14. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit in which a first smoke threshold is set, which is a threshold for smoke concentration that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and in which a first temperature threshold is set, which is a threshold for temperature that serves as a criterion for determining whether a fire has occurred, and a gas detection unit in which a first gas threshold is set, which is a threshold for gas concentration that serves as a criterion for determining whether a fire has occurred; a threshold setting step of changing the temperature thresholds of the plurality of temperature detection units of a second sensor arranged adjacent to the first sensor from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the concentration threshold of the gas detection unit of the second sensor from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke concentration threshold of the smoke detection unit of the second sensor from the first smoke threshold to a second smoke threshold lower than the first smoke threshold, when at least one of the cases where the first smoke concentration detected by the smoke detection unit of the first sensor exceeds the first smoke threshold and the first gas concentration detected by the gas detection unit of the first sensor exceeds the first gas threshold; A fire notification method comprising: a second acquisition step of acquiring a second temperature detected by the plurality of temperature detection units of the second detector, a second gas concentration detected by the gas detection unit of the second detector, and a second smoke concentration of smoke detected by the smoke detection unit of the second detector; and a notification step of notifying that a fire has occurred with its origin at a position between the first detector and the second detector when the second temperature exceeds the second temperature threshold, when the second gas concentration exceeds the second gas threshold, or when the second smoke concentration exceeds the second smoke threshold.

15. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit having a first smoke threshold set therein, which is a threshold for smoke concentration that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and having a first temperature threshold set therein, which is a threshold for temperature that serves as a criterion for determining whether a fire has occurred, and a gas detection unit having a first gas threshold set therein, which is a threshold for gas concentration that serves as a criterion for determining whether a fire has occurred; a threshold setting step of, when the first temperature detected by one of the plurality of temperature detection units possessed by the first sensor exceeds the first temperature threshold, changing the temperature thresholds of the plurality of temperature detection units possessed by a second sensor disposed adjacent to the first sensor on the opposite side of the one temperature detection unit among the plurality of sensors from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the concentration threshold of the gas detection unit possessed by the second sensor from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke concentration threshold of the smoke detection unit possessed by the second sensor from the first smoke threshold to a second smoke threshold lower than the first smoke threshold; a second acquisition step of acquiring the second temperature detected by the plurality of temperature detection units possessed by the second sensor, the second gas concentration detected by the gas detection unit possessed by the second sensor, and the second smoke concentration of the smoke detected by the smoke detection unit possessed by the second sensor; a notification step of notifying that a fire has occurred originating at a position between the first detector and a third detector, the third detector being disposed adjacent to the first detector on the side of the temperature detection unit of the one of the plurality of detectors, in at least one of the cases where the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

16. A first acquisition step of acquiring a first temperature detected by the plurality of temperature detection units possessed by a first detector among a plurality of detectors having a smoke detection unit in which a first smoke threshold is set, which is a threshold for smoke concentration that serves as a criterion for determining whether a fire has occurred, a plurality of temperature detection units arranged around the smoke detection unit and in which a first temperature threshold is set, which is a threshold for temperature that serves as a criterion for determining whether a fire has occurred, and a gas detection unit in which a first gas threshold is set, which is a threshold for gas concentration that serves as a criterion for determining whether a fire has occurred; a threshold setting step of changing the temperature thresholds of the temperature detection units of a plurality of second detectors arranged adjacent to the first detector among the plurality of detectors from the first temperature threshold to a second temperature threshold lower than the first temperature threshold, changing the gas concentration thresholds of the gas detection units of the plurality of second detectors from the first gas threshold to a second gas threshold lower than the first gas threshold, and changing the smoke concentration thresholds of the smoke detection units of the plurality of second detectors from the first smoke threshold to a second smoke threshold lower than the first smoke threshold, in at least one of the cases where the first smoke concentration detected by the smoke detection unit of the first detector exceeds the first smoke threshold and the first gas concentration detected by the gas detection unit of the first detector exceeds the first gas threshold; a second acquisition step of acquiring second temperatures detected by the plurality of temperature detection units respectively possessed by the plurality of second sensors, second gas concentrations detected by the gas detection units respectively possessed by the plurality of second sensors, and second smoke concentrations of smoke detected by the smoke detection units respectively possessed by the plurality of second sensors;a notification step of notifying that a fire has occurred originating at a position between the first detector and a third detector, the third detector being located adjacent to the one second detector on the opposite side of the one second detector among the plurality of second detectors, in at least one of the following cases: when the second temperature detected by the plurality of temperature detection units possessed by one second detector among the plurality of second detectors exceeds the second temperature threshold; when the second gas concentration detected by the gas detection unit possessed by the one second detector exceeds the second gas threshold; and when the second smoke concentration detected by the smoke detection unit possessed by the one second detector exceeds the second smoke threshold.

17. A fire notification method as claimed in claim 16, further comprising, in addition to the first threshold setting step which is the threshold setting step, a second threshold setting step of changing the temperature thresholds of the plurality of temperature detection units of a fourth detector adjacent to the one second detector other than the first detector from the first temperature threshold to the second temperature threshold, changing the gas concentration threshold of the gas detection unit of the fourth detector from the first gas threshold to the second gas threshold, and changing the smoke concentration threshold of the smoke detection unit of the fourth detector from the first smoke threshold to the second smoke threshold, in at least one of the cases where the second temperature exceeds the second temperature threshold, the second gas concentration exceeds the second gas threshold, and the second smoke concentration exceeds the second smoke threshold.

18. A fire notification method according to any one of claims 6 to 17, wherein the gas is carbon monoxide gas.

19. A program for causing one or more processors to execute the fire notification method according to any one of claims 1 to 18.

20. A fire notification system comprising one or more processors executing the program of claim 19.

21. A detector included in the plurality of detectors used in the fire notification method according to any one of claims 1 to 18.

Images