Fire monitoring system and fire detector

Abstract

To provide a fire detector that can quantitatively determine whether the current installation environment is prone to false alarms and swiftly implement countermeasures to reduce false alarms without operator intervention.SOLUTION: A fire detector is provided with a control unit having a fire monitoring function that extracts characteristic values changing due to a fire occurring in the installation environment and determines whether a fire has occurred when the characteristic values exceed a fire threshold. The control unit has an upper limit value set below the fire threshold to monitor the occurrence of characteristic values lower than the fire threshold. During monitoring of the occurrence of the characteristic values, when the characteristic values reach or exceed the upper limit value but remain below the fire threshold, the control unit determines that the installation environment is a non-fire environment close to a fire and enhances the fire monitoring function.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a fire monitoring system and a fire detector that extracts feature quantities that change in response to the occurrence of a fire and determines whether a fire has occurred based on the results of comparing the feature quantities with a fire threshold. [Background technology]

[0002] For example, some fire detectors use a light-emitting element in the light-receiving unit to receive scattered light that is scattered by smoke particles generated by a fire, and determine whether a fire has occurred based on the amount of light received.

[0003] The amount of received light corresponds to a feature that changes in response to the occurrence of a fire. Therefore, such a fire detector can determine that a fire has occurred when the feature exceeds a preset fire threshold.

[0004] Depending on the environment in which a fire detector is installed, steam, dust, cigarette smoke, etc. may cause the detector to mistakenly recognize a fire even when there is no fire, resulting in a "false fire alarm."

[0005] Therefore, there is a conventional technology that automatically identifies detectors that frequently generate non-fire alarms and provides guidance on countermeasures to reduce the number of non-fire alarms (see, for example, Patent Document 1). Specifically, Patent Document 1 has a function that, when the number of non-fire alarms generated by a single detector exceeds a certain level, displays or issues an alarm to that effect, allowing appropriate maintenance measures to be taken.

[0006] Furthermore, Patent Document 1 has the function of comparatively analyzing the causes of non-fire alarms that are accumulated as building-specific data for fire monitoring and common standard data based on legal standards, and announcing countermeasures such as guidance on optimal detectors to reduce non-fire alarms, thereby effectively reducing non-fire alarms. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 8-77483 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the conventional techniques have the following problems. As mentioned above, according to Patent Document 1, the system automatically identifies detectors that frequently generate non-fire alarms when the number of non-fire alarms exceeds a certain number, and, if necessary, provides a function to notify countermeasures such as guidance on the optimal detector to reduce non-fire alarms.

[0009] However, although Patent Document 1 has a function to automatically identify detectors that frequently generate non-fire alarms, the countermeasures to reduce the number of non-fire alarms are merely to provide guidance.

[0010] Therefore, specific mitigation measures depend on the operator who sees the guidance, and those who can implement the mitigation measures are limited to operators who are capable of executing the mitigation measures. Furthermore, until such an operator takes action, the situation in which non-fire alarms are frequently generated continues. Therefore, while the conventional technology described in Patent Document 1 can automatically identify detectors that frequently generate non-fire alarms, it is difficult to quickly implement mitigation measures.

[0011] Furthermore, Patent Document 1 merely determines after the fact whether the current installation environment is one in which non-fire alarms are likely to occur. However, it is actually important to determine whether the current installation environment is one in which non-fire alarms are likely to occur before a non-fire alarm actually occurs, and to prevent unnecessary non-fire alarms from occurring.

[0012] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a fire monitoring system and fire detector that can quantitatively determine whether the current installation environment is prone to generating false fire alarms, and that can quickly implement measures to reduce false fire alarms without operator intervention. [Means for solving the problem]

[0013] The fire monitoring system according to the present disclosure includes a fire detector equipped with a control unit that extracts a feature value that changes when a fire occurs and determines whether a fire has occurred when the feature value exceeds a fire threshold, thereby executing a fire determination process; and a fire receiver that can communicate with the fire detector. a control unit that generates time-series data by sequentially acquiring feature quantities and outputs the generated time-series data to a fire receiver; the fire receiver has an environmental judgment area defined by an upper limit value that is lower than the fire threshold and a lower limit value that is also lower than the upper limit value in order to monitor the occurrence of feature quantities with values ​​lower than the fire threshold; the fire receiver counts the number of times that the feature quantity changes from a value below the lower limit value to within the environmental judgment area over a predetermined judgment period in relation to the transition state of the feature quantity in the time-series data received from the fire detector as the environmental judgment count; if the environmental judgment count exceeds the predetermined environmental judgment threshold, the fire threshold is updated to a value higher than the initial value and the updated value is output to the fire detector as the fire threshold after the setting change; when the control unit receives the updated value from the fire receiver, the control unit changes the fire threshold setting using the updated value and executes fire judgment processing using the fire threshold after the setting change; and the fire receiver has an environmental monitoring function that changes the fire threshold setting according to the installation environment to change the fire detection sensitivity. In addition, the fire detector of the present disclosure is a fire detector equipped with a control unit having a fire monitoring function that extracts feature values ​​that change when a fire occurs in the installation environment and determines whether a fire has occurred when the feature value exceeds a fire threshold, and the control unit is set with an upper limit value that is lower than the fire threshold in order to monitor the occurrence of feature values ​​that are lower than the fire threshold, and if, while monitoring the occurrence of the feature value, the feature value becomes equal to or greater than the upper limit value but less than the fire threshold, it is determined that the installation environment is a non-fire environment that is close to a fire, thereby strengthening the fire monitoring function. In addition, the fire detector according to the present disclosure is a fire detector equipped with a control unit having a fire monitoring function that extracts feature values ​​that change in response to the occurrence of a fire in the installation environment and determines whether a fire has occurred when the feature value exceeds a fire threshold. The control unit sets an environmental judgment area defined by an upper limit value that is lower than the fire threshold and a lower limit value that is also lower than the upper limit value in order to monitor the occurrence of feature values ​​that are lower than the fire threshold. The control unit generates time series data by sequentially acquiring the feature values, and counts the number of times that the feature value changes from a value below the lower limit value to within the environmental judgment area over a predetermined judgment period in relation to the transition state of the feature value from the time series data as the number of environmental judgments. The control unit quantitatively determines whether the current installation environment is an environment that is prone to generating non-fire alarms based on the number of environmental judgments, and executes the environmental monitoring function by dynamically changing the fire threshold to change the detection sensitivity for fire occurrence. If the feature value becomes equal to or greater than the upper limit value and less than the fire threshold while the environmental monitoring function is being executed, the control unit determines that the installation environment is a non-fire environment that is close to a fire, thereby enhancing the fire monitoring function. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to obtain a fire monitoring system and a fire detector that can quantitatively determine whether the current installation environment is prone to generating false fire alarms, and can quickly implement measures to reduce false fire alarms without operator intervention. [Brief explanation of the drawings]

[0015] [Figure 1]FIG. 1 is a functional block diagram of a fire detector according to a first embodiment of the present disclosure. [Figure 2] 2 is a functional block diagram showing the internal configuration of a control unit included in the fire detector according to the first embodiment of the present disclosure. FIG. [Figure 3] 10 is a flowchart showing a series of processes of an environment monitoring function for updating a fire threshold value executed by an environment monitoring processing unit according to the first embodiment of the present disclosure. [Figure 4] FIG. 2 is an explanatory diagram relating to an environment monitoring function for updating a fire threshold value according to the first embodiment of the present disclosure. [Figure 5] 10 is a flowchart showing a series of processes of an environment monitoring function for restoring a fire threshold value, which is executed by an environment monitoring processing unit according to the first embodiment of the present disclosure. [Figure 6] FIG. 2 is an explanatory diagram relating to an environment monitoring function for restoring a fire threshold value according to the first embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, preferred embodiments of the fire monitoring system and fire detector of the present disclosure will be described with reference to the drawings. In the following embodiment 1, a fire detector will be described as an example, which receives light scattered by smoke particles generated by a fire and determines whether a fire has occurred by comparing the amount of received light with a fire threshold value as a characteristic.

[0017] However, the fire detector according to the present disclosure is not limited to such a configuration, and can be applied to a fire detector that determines whether a fire has occurred based on the result of comparing a feature that changes in response to the occurrence of a fire with a fire threshold.

[0018] The fire monitoring system and fire detector disclosed herein have a technical feature of being equipped with an environmental monitoring function that changes the detection sensitivity for fire occurrence by dynamically changing the fire threshold according to the installation environment, and can quantitatively determine whether the current installation environment is prone to generating non-fire alerts.By quickly implementing measures to reduce non-fire alerts without operator intervention, the fire monitoring system and fire detector can achieve the remarkable effect of preventing unnecessary non-fire alerts from occurring.

[0019] Embodiment 1 1 is a functional block diagram of a fire detector according to the first embodiment of the present disclosure. The fire detector 1 according to the first embodiment includes a light-emitting element 11, a light-receiving element 12, an amplifier 20, a controller 30, and an alarm transmitter 40.

[0020] The light-emitting element 11 emits light of a predetermined wavelength and intensity as a signal component at a predetermined timing in order to detect smoke generated by a fire. On the other hand, the light-receiving element 12 is disposed in a position where the light emitted by the light-emitting element 11 does not directly enter the light-receiving element 12. The light-receiving element 12 receives the light emitted from the light-emitting element 11 and scattered by smoke particles, and outputs the light as an electrical signal, specifically a voltage value.

[0021] An example of a light-emitting element 11 that emits light of a predetermined wavelength and light intensity is an LED that emits a 20 kHz optical signal for fire detection, or an LED that emits light intermittently with a light pulse of 100 microseconds and a light emission period of 2 seconds.

[0022] The amplifier 20 amplifies the voltage value output from the light receiving element 12 and outputs the amplified voltage to the control unit 30 .

[0023] When detecting smoke, the control unit 30 controls the light emitting element 11 to emit light at a predetermined timing. Then, the control unit 30 receives a voltage value received via the light receiving element 12 and the amplifier unit 20 in response to the emission of light from the light emitting element 11 as a feature value that changes due to the occurrence of a fire. Furthermore, the control unit 30 detects the occurrence of smoke when the feature value exceeds a preset fire threshold value, and determines that a fire has occurred.

[0024] Furthermore, when the control unit 30 determines that a fire has occurred, it is possible to notify the outside world of the occurrence of the fire via the alarm unit 40. The control unit 30 executes the series of processes described above to execute the fire determination process.

[0025] Next, the environmental monitoring function that the fire detector of the present disclosure has as a technical feature will be described in detail. Fig. 2 is a functional block diagram showing the internal configuration of the control unit 30 included in the fire detector 1 of the first embodiment of the present disclosure. The control unit 30 includes a fire determination processing unit 31 and an environmental monitoring processing unit 32.

[0026] During fire monitoring, the fire detection processing unit 31 executes the above-mentioned series of fire detection processes. Meanwhile, the environment monitoring processing unit 32 executes an environment monitoring function that changes the fire detection sensitivity by dynamically changing the fire threshold value according to the installation environment.

[0027] Specific examples of installation environments include smoking rooms and hotel bathrooms, where steam, dust, cigarette smoke, etc. can cause the device to mistakenly recognize a fire when there is no fire, resulting in a "false fire alarm."

[0028] Fig. 3 is a flowchart showing a series of processes of the environment monitoring function for updating the fire threshold value executed by the environment monitoring processing unit 32 according to the first embodiment of the present disclosure. Fig. 4 is an explanatory diagram showing the environment monitoring function for updating the fire threshold value according to the first embodiment of the present disclosure. The environment monitoring function for dynamically changing the fire threshold value will be described in detail with reference to Figs. 3 and 4.

[0029] First, the technical meanings of the terms shown in Figure 4 used when performing the environmental monitoring function for updating fire thresholds are listed below. "Time series data": A data sequence generated by the control unit 30 at predetermined intervals as data on feature quantities that change as a result of the occurrence of a fire. In the example of Fig. 1, the control unit 30 sequentially acquires, via the amplifier unit 20, voltage values ​​corresponding to the intensity of light scattered by smoke particles as feature quantities.

[0030] It is also possible to generate time-series data of feature quantities within the control unit 30 based on physical quantities obtained from the outside. That is, the feature quantities are extracted by the control unit 30 as values ​​that change in response to the occurrence of a fire.

[0031] "Fire threshold (initial value)": This is an initially set value used to compare the magnitude relationship with each feature in the time-series data. When a feature greater than this value is detected, this is the threshold for determining that a fire has occurred.

[0032] "Fire threshold (updated value)": This is a fire threshold that is dynamically updated according to the installation environment in order to change the detection sensitivity of fire occurrence by executing the environmental monitoring function for updating the fire threshold, which will be described later.

[0033] "Upper limit value": A value for specifying the upper limit of the "environmental judgment region", which is a value that is set in advance as a value lower than the fire threshold value. "Lower limit value": A value for specifying the lower limit of the "environment determination region", which is a value that is set in advance as a value lower than the upper limit value.

[0034] "Environmental judgment range": A range of values ​​defined by an "upper limit" and a "lower limit". This range is used to monitor the occurrence of features with values ​​lower than the fire threshold, and to count the number of times that a non-fire alarm does not actually occur, but quantitatively indicates that the environment is prone to non-fire alarms.

[0035] "Determination period": A value set in advance as a period for counting the number of times that quantitatively indicate that the environment is prone to false fire alarms.

[0036] "Environmental Determination Threshold": Although not shown in Figure 4, this is a threshold used to determine whether to change from the "Fire Threshold (Initial Value)" to the "Fire Threshold (Updated Value)." Specifically, this is a threshold used for comparison with the number of environmental determinations described below.

[0037] Using these terms and the explanatory diagram of Fig. 4, each step of the flowchart of Fig. 3 will be explained in order. In step S301, the environment monitoring processing unit 32 generates time-series data by sequentially acquiring feature amounts. Fig. 4 shows an example of time-series data related to feature amounts when a determination period is 25 days.

[0038] Figure 4 illustrates an example of a state in which the time-series data of the feature value transitions within a value below the fire threshold over the judgment period, but also transitions within a range of environmental judgment regions established to prevent false fire alarms and quantitatively determine whether the current installation environment is prone to false fire alarms.

[0039] Next, in step S302, the environment monitoring processing unit 32 counts, as the number of times that the feature value changes from a value below the lower limit to within the environment determination range over a predetermined determination period, the transition state of the feature value according to the time-series data. Based on the determination period shown in Fig. 4 and the relationship between the transition state of the time-series data and the environment determination range, the number of environment determinations is counted as four over the 25-day determination period.

[0040] In this way, the environmental monitoring processing unit 32 can quantitatively determine whether the current environment is prone to generating non-fire alarms by counting the number of times that a feature value enters the environmental judgment area set up to monitor the occurrence of feature values ​​lower than the fire threshold.

[0041] Next, in step S303, the environment monitoring processing unit 32 determines whether the number of environment determinations, which is the count result in step S302, exceeds a preset environment determination threshold. For simplicity of explanation, it is assumed here that the environment determination threshold is set to three times, and the determination in step S303 is YES.

[0042] If the determination in step S303 is YES, the process proceeds to step S304, where the environment monitoring processing unit 32 changes the setting of the fire threshold to an updated value higher than the initial value. Then, if the process in step S304 is completed or if the determination in step S303 is NO, the environment monitoring processing unit 32 ends the series of processes.

[0043] By executing this series of processes, the environment monitoring processing unit 32 can dynamically change the fire threshold depending on the installation environment, thereby changing the fire detection sensitivity. In other words, by executing this series of processes, the environment monitoring processing unit 32 quantitatively determines whether the installation environment is prone to false fire alarms, and if it determines that the installation environment is prone to false fire alarms, it changes the fire threshold to an updated value higher than the initial value, thereby lowering the fire detection sensitivity and making it possible to prevent false fire alarms from occurring.

[0044] When performing the update process in step S304, the environment monitoring processing unit 32 can change the fire threshold to a higher updated value as the number of environmental determinations in the determination period increases, depending on the count value.

[0045] Also, although not shown in the flowchart of Figure 3, the environmental monitoring processing unit 32 in the control unit 30 has another function, different from the environmental monitoring function, for changing the fire threshold, and if the other function is set to a higher priority than the environmental monitoring function, it is also possible to prevent the environmental monitoring function from changing the setting of the fire threshold during the period when the other function is enabled.

[0046] For example, if a separate function, a nighttime function for setting appropriate fire thresholds at night, is set as a higher priority than the environmental monitoring function, the environmental monitoring processing unit 32 will not perform any changes to the fire threshold settings using the environmental monitoring function during the period when the nighttime function is enabled.

[0047] Furthermore, the upper limit is set to a value that does not exceed the initial fire threshold, but this is because if the upper limit is set to the same value as or higher than the fire threshold, the feature value will also exceed the fire threshold, preventing a situation that should actually be judged as a fire from being judged as a non-fire.In this case, by setting the upper limit to a level slightly lower than the fire threshold, if the feature value is equal to or higher than the fire threshold, the monitoring function can be changed to treat the situation as being close to a fire, such as strengthening fire monitoring while continuing to function environmental monitoring, or judging that the environment is a non-fire environment that is close to a fire.

[0048] The series of processes shown in FIG. 3 can be repeatedly executed in sequence during the period in which the environmental monitoring function for updating the fire threshold is enabled.

[0049] Next, a series of processes for restoring the fire threshold, which changes the fire threshold from the initial value to an updated value and then returns it to the initial value, will be described. Fig. 5 is a flowchart relating to a series of processes of the environment monitoring function for restoring the fire threshold, which is executed by the environment monitoring processing unit 32 in the first embodiment of the present disclosure. Fig. 6 is an explanatory diagram relating to the environment monitoring function for restoring the fire threshold in the first embodiment of the present disclosure. The environment monitoring function will be described in detail using Figs. 5 and 6.

[0050] First, the technical meanings of the terms shown in Figure 6, which are used when executing the environmental monitoring function for restoring the fire threshold, are listed below. Note that explanations of the same terms as in Figure 4 will be omitted.

[0051] "Return judgment period": A pre-set period for making a judgment to return the "Fire threshold (updated value)", which was changed from the "Fire threshold (initial value)" as a result of executing the environmental monitoring function for updating the fire threshold shown in Figure 3, to the original "Fire threshold (initial value)".

[0052] "Return determination threshold": A threshold used in the return determination process to return the "fire threshold (updated value)", which was changed from the "fire threshold (initial value)" as a result of executing the environmental monitoring function for updating the fire threshold shown in Figure 3, to the original "fire threshold (initial value)". Specifically, this is a threshold used for comparison with the return determination count described below.

[0053] Using these terms and the explanatory diagram of Fig. 6, each step of the flowchart of Fig. 5 will be explained in order. In step S501, the environment monitoring processing unit 32 generates time-series data by sequentially acquiring feature amounts. Fig. 6 shows an example of time-series data related to feature amounts when a 30-day return determination period is set.

[0054] FIG. 6 illustrates an example in which the time-series data of the feature amount transitions at a value smaller than the return determination threshold over the return determination period, and the feature amount continues to be equal to or smaller than the return determination threshold.

[0055] Next, in step S502, the environment monitoring processing unit 32 counts the number of times that the transition state of the feature amount in the time-series data has changed to exceed the restoration determination threshold over a preset restoration determination period as the restoration determination count. From the restoration determination period shown in Fig. 6 and the relationship between the transition state of the time-series data and the restoration determination threshold, the restoration determination count is set to 0 over the 30-day restoration determination period.

[0056] In this way, the environmental monitoring processing unit 32 can quantitatively determine whether the current environment is no longer one that is prone to generating non-fire alarms by counting the number of times the feature exceeds the return judgment threshold.

[0057] Next, in step S503, the environment monitoring processing unit 32 determines whether the number of recovery determinations, which is the count result in step S502, is 0. Here, since the number of recovery determinations was counted as 0 in the previous step S502, the determination in step S503 is YES.

[0058] If the determination in step S503 is YES, the process proceeds to step S504, where the environment monitoring processing unit 32 resets the fire threshold to an initial value that is lower than the updated value. Then, if the process in step S504 is completed or if the determination in step S503 is NO, the environment monitoring processing unit 32 ends the series of processes.

[0059] By executing this series of processes, the environment monitoring processing unit 32 can dynamically change the fire threshold value according to the installation environment, thereby changing the fire detection sensitivity. In other words, by executing this series of processes, the environment monitoring processing unit 32 quantitatively determines whether the installation environment is no longer one in which non-fire alarms are likely to occur, and if it determines that the installation environment has returned to the initial environment in which non-fire alarms are unlikely to occur, it changes the fire threshold value to an initial value that is lower than the updated value, thereby improving the fire detection sensitivity to its original value and enabling highly accurate fire detection.

[0060] 5 and 6, the restoration determination period is set to be longer than the determination period, and the restoration determination threshold is set to be lower than the lower limit value. As a result, a hysteresis characteristic can be provided when the fire threshold is changed to an initial value lower than the updated value.

[0061] In the determination process in step S503, the number of times of return determination is compared with 0, but it is also possible to compare it with a value of 1 or more.

[0062] In addition, when executing the restoration process in step S504, the environment monitoring processing unit 32 can also change the setting depending on the count value of the number of restoration judgments during the restoration judgment period so that the fire threshold approaches the initial value as the number of times decreases.

[0063] The series of processes shown in FIG. 5 can be repeatedly executed in sequence during the period in which the environmental monitoring function for restoring the fire threshold is enabled.

[0064] In addition, in Figure 4, the judgment period is set to 25 days, and in Figure 6, the recovery judgment period is set to 30 days, but these settings are just examples, and an appropriate period can be set depending on the installation environment.

[0065] As described above, according to the first embodiment, by dynamically changing the fire threshold based on the transition state of the feature quantity that changes in response to the occurrence of a fire, it is possible to automatically change the fire detection sensitivity to a level appropriate for the installation environment. In other words, it is possible to realize a fire detector that can quantitatively determine whether the current installation environment is prone to the occurrence of non-fire alarms before a non-fire alarm actually occurs, and that can quickly implement measures to reduce the occurrence of non-fire alarms without operator intervention.

[0066] In the first embodiment, the fire threshold is changed based on the time-series data of the fire detector, but the same control may be performed on the fire receiver side. In this case, the fire detector outputs the time-series data (analog data) together with the address to the receiver, and the receiver determines whether the time-series data falls within the environment determination area. [Explanation of symbols]

[0067] 1 fire detector, 11 light emitting element, 12 light receiving element, 20 amplifier unit, 30 control unit, 31 fire determination processing unit, 32 environmental monitoring processing unit, 40 alarm unit.

Claims

1. a fire detector including a control unit that extracts a feature amount that changes in response to the occurrence of a fire, and determines whether a fire has occurred or not when the feature amount exceeds a fire threshold, thereby executing a fire determination process; a fire receiver capable of communicating with the fire detector; A fire monitoring system comprising: The control unit generating time-series data by sequentially acquiring the feature amounts; outputting the generated time series data to the fire alarm receiver; The fire receiver includes: an environment determination area is set, the environment determination area being defined by an upper limit value that is a value lower than the fire threshold and a lower limit value that is a value lower than the upper limit value, in order to monitor occurrence conditions of feature quantities that are lower than the fire threshold; With regard to the transition state of the feature value according to the time-series data received from the fire detector, counting the number of times that the feature value changes from a value less than the lower limit value to within the environment determination range over a predetermined determination period as an environment determination count; When the number of environmental judgments exceeds a preset environmental judgment threshold, the fire threshold is changed to an updated value higher than the initial value, and the updated value is output to the fire detector as the fire threshold after the setting change; When the control unit receives the updated value from the fire receiver, the control unit changes the setting of the fire threshold value according to the updated value, and executes the fire determination process using the fire threshold value after the setting change. A fire monitoring system equipped with an environmental monitoring function that changes the detection sensitivity of fire occurrence by dynamically changing the fire threshold according to the installation environment.

2. The fire receiver includes: The fire threshold is set to a higher updated value as the number of environmental determinations increases according to a count value of the number of environmental determinations during the determination period. The fire monitoring system according to claim 1 .

3. The fire receiver includes: In order to restore the fire threshold set to the updated value to the initial value, a restoration determination period that is a period longer than the determination period and a restoration determination threshold that is a value lower than the lower limit value are set in advance, Regarding the transition state of the feature value according to the time series data, if the feature value remains equal to or less than the return determination threshold value over the return determination period, the fire threshold value is changed to the initial value, and the initial value is output to the fire detector as the fire threshold value after the setting change.

3. A fire monitoring system according to claim 1 or 2.

4. The fire receiver includes: When a function different from the environmental monitoring function is provided as a function for changing the fire threshold and the other function is set to have a higher priority than the environmental monitoring function, the setting change of the fire threshold by the environmental monitoring function is not executed during a period when the other function is enabled. A fire monitoring system according to any one of claims 1 to 3.

5. A fire detector equipped with a control unit having a fire monitoring function that extracts a feature quantity that changes in response to the occurrence of a fire in an installation environment, and determines whether or not a fire has occurred when the feature quantity exceeds a fire threshold, The control unit an upper limit value that is lower than the fire threshold is set in order to monitor occurrence of a feature value that is lower than the fire threshold, When the feature value becomes equal to or greater than an upper limit value and less than a fire threshold value while monitoring the occurrence status of the feature value, the installation environment is determined to be a non-fire environment close to a fire, and the fire monitoring function is strengthened. fire detector.

6. A fire detector equipped with a control unit having a fire monitoring function that extracts a feature quantity that changes in response to the occurrence of a fire in an installation environment, and determines whether or not a fire has occurred when the feature quantity exceeds a fire threshold, The control unit an environment determination area is set, the environment determination area being defined by an upper limit value that is a value lower than the fire threshold and a lower limit value that is a value lower than the upper limit value, in order to monitor occurrence conditions of feature quantities that are lower than the fire threshold; generating time-series data by sequentially acquiring the feature amounts; counting the number of times that the feature value changes from a value less than the lower limit value to within the environment determination range over a predetermined determination period, as an environment determination count, with respect to a transition state of the feature value according to the time-series data; Quantitatively determining whether the current installation environment is prone to generating non-fire alarms according to the number of environmental judgments, and dynamically changing the fire threshold to change the detection sensitivity of fire occurrence, thereby executing an environmental monitoring function; If the characteristic amount becomes equal to or greater than an upper limit value and less than a fire threshold value while the environment monitoring function is being executed, the installation environment is determined to be a non-fire environment close to a fire, and the fire monitoring function is strengthened. fire detector.

7. The upper limit is set to a value slightly lower than the fire threshold.

7. The fire detector according to claim 5 or 6.

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