Ventilation system

Abstract

A central air conditioning system as an example of a ventilation system according to the present disclosure comprises ventilation devices (3-6), a carbon dioxide measurement unit (101a), a sleep preparation sensing unit (320), and a control unit (200). The ventilation devices (3-6) are provided to perform ventilation of a predetermined space. The carbon dioxide measurement unit (101a) measures the carbon dioxide concentration in the predetermined space. The sleep preparation sensing unit (320) senses that a user in the predetermined space is in a sleep preparation state. And, the control unit (200) controls ventilation provided by the ventilation devices (3-6) on the basis of the result of sensing by the sleep preparation sensing unit (320) and the carbon dioxide concentration measured by the carbon dioxide measurement unit (101a).

Description

[Technical field]

[0001] The present disclosure relates to ventilation systems. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a ventilation system that controls the ventilation air volume of a ventilation device based on a carbon dioxide concentration detected by a carbon dioxide detection unit in a room (for example, Patent Document 1).

[0003] The ventilation system will be described below with reference to Fig. 8. Fig. 8 is a schematic connection diagram of a conventional ventilation system 1001.

[0004] As shown in Fig. 8, the ventilation system 1001 includes a ventilation device 1002, a control unit 1003, and a carbon dioxide detection unit 1004. The ventilation device 1002 is a device for replacing indoor air. The carbon dioxide detection unit 1004 detects the carbon dioxide concentration in the room. The control unit 1003 controls the ventilation air volume of the ventilation device 1002 based on the indoor carbon dioxide concentration detected by the carbon dioxide detection unit 1004 so that the indoor carbon dioxide concentration reaches a target value.

[0005] As a result, the ventilation system 1001 is capable of keeping the carbon dioxide concentration in the room below a predetermined value, thereby realizing a comfortable indoor environment. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-124788 A Summary of the Invention

[0007] Incidentally, it is known that when a user goes from an awake and active state to a sleep preparation state in which the user is preparing to fall asleep, the user is more likely to fall asleep if the carbon dioxide concentration is relatively high.

[0008] In the control of a conventional ventilation system such as the above-mentioned ventilation system 1001, ventilation is performed by the ventilation device when the carbon dioxide concentration is greater than a predetermined value. Therefore, even when the user enters a sleep preparation state, ventilation is performed by the ventilation device when the carbon dioxide concentration is greater than the predetermined value, and the carbon dioxide concentration in the room decreases. As a result, the conventional ventilation system may prevent the user from falling asleep. In other words, the conventional ventilation system has a problem that it may not be possible to realize a space suitable for the user to fall asleep.

[0009] Therefore, the present disclosure provides a ventilation system that contributes to creating a space suitable for a user to fall asleep.

[0010] The ventilation system according to the present disclosure includes a ventilation device, a carbon dioxide measurement unit, a sleep preparation detection unit, and a control unit. The ventilation device is for ventilating a specified space. The carbon dioxide measurement unit measures the carbon dioxide concentration in the specified space. The sleep preparation detection unit detects that a user in the specified space is in a state of preparation for sleep. The control unit controls ventilation by the ventilation device based on the detection result of the sleep preparation detection unit and the carbon dioxide concentration measured by the carbon dioxide measurement unit. Control. The control unit further includes a concentration storage unit that stores a first threshold value indicating a carbon dioxide concentration suitable for falling asleep and a second threshold value that is greater than the first threshold value. When the sleep preparation detection unit detects that the user is in a state of preparation for sleep and the carbon dioxide concentration measured by the carbon dioxide measurement unit is smaller than the second threshold value, the control unit controls the ventilation by the ventilator to stop ventilation. The control unit further includes a concentration acquisition unit that acquires the carbon dioxide concentration measured by the carbon dioxide measurement unit. The concentration storage unit further stores sleep-onset concentration information indicating the carbon dioxide concentration at the time of the user falling asleep. When the control unit detects that the sleep preparation detection unit is in a state of preparation for sleep, the control unit controls ventilation by the ventilator so that the carbon dioxide concentration acquired by the concentration acquisition unit approaches the carbon dioxide concentration at the time of the user falling asleep indicated by the sleep-onset concentration information stored in the concentration storage unit.

[0011] The ventilation system according to the present disclosure can provide a ventilation system that contributes to realizing a space suitable for a user to fall asleep. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic connection diagram of a central air-conditioning system according to a first embodiment, which is an example of a ventilation system according to the present disclosure. [Diagram 2] FIG. 2 is a schematic functional block diagram of the system controller and peripheral devices according to the first embodiment of the present disclosure. [Diagram 3] FIG. 3 is a diagram showing a data configuration of the sleep-onset carbon dioxide concentration table according to the first embodiment of the present disclosure. [Figure 4] FIG. 4 is a flowchart showing ventilation control according to the first embodiment of the present disclosure. [Diagram 5] FIG. 5 is a schematic functional block diagram of a system controller and peripheral devices according to the second embodiment of the present disclosure. [Figure 6] FIG. 6 is a diagram showing a data configuration of a carbon dioxide concentration at sleep onset table according to the second embodiment of the present disclosure. [Figure 7] FIG. 7 is a flowchart showing ventilation control according to the second embodiment of the present disclosure. [Figure 8] FIG. 8 is a schematic connection diagram of a conventional ventilation system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the embodiments for carrying out the present disclosure will be described with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present disclosure. Therefore, the components, the arrangement and connection of the components, the steps (processes) and the order of the steps shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, components that are not described in the independent claims showing the highest concept of the present disclosure will be described as optional components. In addition, in each figure, the same reference numerals are given to substantially the same configurations, and duplicated descriptions are omitted or simplified.

[0014] (Embodiment 1) In this embodiment, a central air-conditioning system 20 will be described as an example of a ventilation system according to the present disclosure. First, the overall configuration of the central air-conditioning system 20 will be described. Fig. 1 is a schematic connection diagram of the central air-conditioning system 20 according to this embodiment.

[0015] 1, the central air-conditioning system 20 includes an outside air intake fan 4, an exhaust fan 5 (exhaust fans 5a, 5b, 5c, 5d), a transport fan 3 (transport fans 3a, 3b, 3c, 3d), and a circulation fan 6 (circulation fans 6a, 6b, 6c, 6d). The central air-conditioning system 20 also includes a room temperature sensor 11 (room temperature sensors 11a, 11b, 11c, 11d), a room humidity sensor 12 (room humidity sensors 12a, 12b, 12c, 12d), an air-conditioned room temperature sensor 14, and an air-conditioned room humidity sensor 15. The central air conditioning system 20 includes an air conditioner 9, a humidifier 16, a dehumidifier 17, an input / output terminal 19, a system controller 10, and a carbon dioxide measuring unit 101 (carbon dioxide measuring units 101a, 101b, 101c).

[0016] The central air-conditioning system 20 also cooperates with mobile terminals 100 (mobile terminals 100a, 100b, 100c) carried by users. In the present embodiment, the mobile terminal 100 is described as including a carbon dioxide measuring unit 101.

[0017] The central air-conditioning system 20 is installed in a general house 1, which is an example of a building. The general house 1 has a plurality of (four in this embodiment) living rooms 2 (living rooms 2a, 2b, 2c, 2d), each of which is an example of a predetermined space according to the present disclosure, and at least one air-conditioned room 18 independent of the living rooms 2. Here, the general house 1 (house) is a residence provided as a place for residents to live private lives, and the living rooms 2 generally include a living room, dining room, bedroom, private room, children's room, etc. Furthermore, the living rooms 2 provided by the central air-conditioning system 20 may include a toilet, bathroom, washroom, dressing room, etc.

[0018] In the air-conditioning room 18, the air transported from each living room 2 is mixed. In addition, the outside air is taken into the air-conditioning room 18 by the outside air intake fan 4, and mixed with the air transported from each living room 2 by the circulation fan 6. The temperature and humidity of the air in the air-conditioning room 18 are controlled by the air conditioner 9, humidifier 16, and dehumidifier 17 installed in the air-conditioning room 18. That is, in the air-conditioning room 18, air to be transported to the living room 2 with its temperature and humidity adjusted is generated. The air whose temperature and humidity have been adjusted in the air-conditioning room 18 is transported to each living room 2 by the transport fan 3. Here, the air-conditioning room 18 means a space with a certain size in which the air conditioner 9, the humidifier 16, the dehumidifier 17, etc. can be placed and which is capable of controlling the air conditioning of each living room 2, but it is not intended as a living space, and does not basically mean a room where a resident stays.

[0019] The air in each living room 2 is transported to the air-conditioned room 18 by the circulation fan 6, and is also exhausted from the living room 2 to outside the general house 1 as outside air by the exhaust fan 5. The central air-conditioning system 20 controls the exhaust air volume of the exhaust fan 5 to exhaust outside air from the living room 2, while controlling the supply air volume of the outside air introduction fan 4 in conjunction with the exhaust air volume of the exhaust fan 5 to take in outside air into the living room 2. This achieves ventilation using the first type of ventilation method.

[0020] The outdoor air introduction fan 4 is a fan that takes in outdoor air into the room of the general house 1, and corresponds to, for example, an air supply fan or the air supply function of a heat exchange fan. As described above, the outdoor air taken in by the outdoor air introduction fan 4 is introduced into the air-conditioned room 18. The supply air volume of the outdoor air introduction fan 4 can be set in multiple stages, and the supply air volume is set according to the exhaust air volume of the exhaust fan 5, as described later.

[0021] The exhaust fan 5 is a fan that exhausts part of the air in the room 2 in which it is installed as outside air through, for example, an exhaust duct. Examples of such fans include ceiling fans, wall-mounted fans, range hoods, and the exhaust function of a heat exchange fan. In FIG. 1, the exhaust duct connected to the exhaust fan 5 is directly connected to the outside of the general house 1, but when using the exhaust function of a heat exchange fan, the exhaust duct is first connected to the heat exchange fan and then connected to the outside of the general house 1. In other words, the air passing through the exhaust duct is heat exchanged with the air passing through the intake air duct of the heat exchange fan, and then exhausted to the outside of the general house 1. As shown in FIG. 1, the exhaust fan 5a is installed in the room 2a, the exhaust fan 5b in the room 2b, the exhaust fan 5c in the room 2c, and the exhaust fan 5d in the room 2d.

[0022] Each exhaust fan 5 is configured so that its exhaust air volume can be set in multiple stages. Normally, each exhaust fan 5 is controlled by the system controller 10 so that the exhaust air volume is set to a preset value. Then, the system controller 10 controls the exhaust air volume for each of the exhaust fans 5a to 5d according to settings by the user and values ​​acquired by various sensors, for example, the carbon dioxide measuring unit 101.

[0023] Each transport fan 3 is provided, for example, on a wall surface of the air-conditioned room 18 corresponding to each room 2. Specifically, the air in the air-conditioned room 18 is transported to room 2a via a transport duct by transport fan 3a, and is transported to room 2b via a transport duct by transport fan 3b. The air in the air-conditioned room 18 is transported to room 2c via a transport duct by transport fan 3c, and is transported to room 2d via a transport duct by transport fan 3d. The transport ducts connecting each transport fan 3 and each room 2 are provided independently.

[0024] Circulation fan 6a is provided in room 2a, circulation fan 6b in room 2b, circulation fan 6c in room 2c, and circulation fan 6d in room 2d. A portion of the air in each room 2 is transported to air-conditioning room 18 via a circulation duct by the corresponding circulation fan 6. The circulation ducts connecting air-conditioning room 18 and each room 2 may be provided independently, or multiple branch ducts that are part of the circulation duct may be joined midway to form a single circulation duct, and the resulting single circulation duct may then be connected to air-conditioning room 18.

[0025] The air conditioner 9 is an air conditioner installed in the air-conditioned room 18, and controls the air conditioning of the air-conditioned room 18. The air conditioner 9 cools or heats the air in the air-conditioned room 18 so that the temperature of the air in the air-conditioned room 18 becomes a set temperature (hereinafter also referred to as the "air-conditioned room target temperature").

[0026] The humidifier 16 is installed in the air-conditioned room 18, and when the humidity of the air in the air-conditioned room 18 is lower than a set humidity (hereinafter also referred to as the "air-conditioned room target humidity"), the humidifier 16 humidifies the air in the air-conditioned room 18 so that the humidity becomes the air-conditioned room target humidity. Note that while the humidifier 16 may be built into the air conditioner 9, it is preferable to provide the humidifier 16 independent of the air conditioner 9 in order to obtain a humidification capacity sufficient for a plurality of rooms 2.

[0027] The dehumidifier 17 is installed in the air-conditioned room 18, and when the humidity of the air in the air-conditioned room 18 is higher than the air-conditioned room target humidity, the dehumidifier 17 dehumidifies the air in the air-conditioned room 18 so that the humidity becomes the air-conditioned room target humidity. Note that while the dehumidifier 17 may be built into the air conditioner 9, it is preferable to provide the dehumidifier 17 independent of the air conditioner 9 in order to obtain a dehumidification capacity sufficient for a plurality of rooms 2.

[0028] Each room temperature sensor 11 is provided in a corresponding room 2. Specifically, room temperature sensor 11a is provided in room 2a, room temperature sensor 11b is provided in room 2b, room temperature sensor 11c is provided in room 2c, and room temperature sensor 11d is provided in room 2d. Each room temperature sensor 11 is a sensor that acquires the indoor temperature of each of the corresponding rooms 2a to 2d and transmits the same to the system controller 10.

[0029] Each living room humidity sensor 12 is provided in a corresponding living room 2. Specifically, living room humidity sensor 12a is provided in living room 2a, living room humidity sensor 12b is provided in living room 2b, living room humidity sensor 12c is provided in living room 2c, and living room humidity sensor 12d is provided in living room 2d. Each living room humidity sensor 12 is a sensor that acquires the indoor humidity (living room humidity) of each of the corresponding living rooms 2a to 2d and transmits it to the system controller 10.

[0030] The air-conditioned room temperature sensor 14 is a sensor that acquires the temperature of the air in the air-conditioned room 18 and transmits it to the system controller 10. The air-conditioned room temperature sensor 14 may be built into the air conditioner 9, but if it is built into the air conditioner 9, only information about the surroundings of the air conditioner 9 (for example, near the air intake port) can be obtained. Since the air-conditioned room 18 is a mixture of outside air and air transported from each room 2 as described above, it is desirable to provide the air-conditioned room temperature sensor 14 independent of the air conditioner 9 so that information about the air-conditioned room 18 as a whole can be obtained.

[0031] The air-conditioned room humidity sensor 15 is a sensor that acquires the humidity of the air in the air-conditioned room 18 and transmits it to the system controller 10. For the same reason as the air-conditioned room temperature sensor 14, it is desirable to provide the air-conditioned room humidity sensor 15 independently of the air conditioner 9 so that information on the air-conditioned room 18 as a whole can be obtained.

[0032] The mobile terminal 100 includes a carbon dioxide measuring unit 101. Specifically, the carbon dioxide measuring unit 101a is provided in the mobile terminal 100a, the carbon dioxide measuring unit 101b is provided in the mobile terminal 100b, and the carbon dioxide measuring unit 101c is provided in the mobile terminal 100c. The mobile terminal 100 is a terminal carried by a user, and is an information terminal that can move with the user by being carried by the user at all times. In this embodiment, when there are multiple users, it is described that each user has one mobile terminal 100. The mobile terminal 100 is, for example, a mobile phone, a smartphone, a wearable terminal, etc. Also, a wearable terminal is an electronic device terminal that is worn and used, such as a wristwatch-type terminal.

[0033] The carbon dioxide measuring unit 101 measures the carbon dioxide concentration around the carbon dioxide measuring unit 101, and is, for example, a carbon dioxide sensor whose output voltage value changes according to the carbon dioxide concentration. That is, the central air-conditioning system 20 includes a carbon dioxide measuring unit 101 that measures the carbon dioxide concentration in the room 2. The carbon dioxide measuring unit 101 acquires the carbon dioxide concentration around the corresponding mobile terminal 100, that is, the carbon dioxide concentration in the room 2 (rooms 2c, 2d in this embodiment) in which the mobile terminal 100 exists. Then, the carbon dioxide measuring unit 101 transmits the acquired carbon dioxide concentration to the system controller 10 via the corresponding mobile terminal 100.

[0034] The system controller 10 controls the air conditioning of the living room 2 provided in the general house 1, and is a controller that controls the entire central air conditioning system 20. The system controller 10 is connected to each controlled object so as to be able to communicate with them via wireless communication. The controlled objects include an outside air intake fan 4, an exhaust fan 5, a transport fan 3, a circulation fan 6, a living room temperature sensor 11, a living room humidity sensor 12, an air-conditioned room temperature sensor 14, an air-conditioned room humidity sensor 15, an air conditioner 9, a humidifier 16, a dehumidifier 17, and a mobile terminal 100.

[0035] The system controller 10 controls the outdoor air introduction fan 4 and the exhaust fan 5 in conjunction with each other, for example by setting the intake air volume of the outdoor air introduction fan 4 so that the air volume corresponds to the exhaust air volume of the exhaust fan 5. In this way, ventilation is performed for the general house 1 using the first type ventilation method.

[0036] Furthermore, the system controller 10 controls the air conditioner 9, humidifier 16, and dehumidifier 17 as air conditioners, based on the temperature and humidity of the air in the air-conditioned room 18 acquired by the air-conditioned room temperature sensor 14 and the air-conditioned room humidity sensor 15. Specifically, the system controller 10 controls the air conditioner 9, humidifier 16, and dehumidifier 17 so that the temperature and humidity in the air-conditioned room 18 become the air-conditioned room target temperature and air-conditioned room target humidity set for the air-conditioned room 18.

[0037] Furthermore, the system controller 10 sets the air volume of the transport fan 3 and the air volume of the circulation fan 6 based on the indoor temperature and indoor humidity of each room 2 acquired by the room temperature sensor 11 and the room humidity sensor 12. Specifically, the system controller 10 sets the air volume of the transport fan 3 and the air volume of the circulation fan 6 so that the indoor temperature and indoor humidity of each room 2 become the temperature (hereinafter also referred to as the "room target temperature") and humidity (hereinafter also referred to as the "room target humidity") set for each room 2.

[0038] As a result, the air conditioned in the air-conditioning room 18 is transported to each living room 2 at the air volume set in each transport fan 3, and the air in each living room 2 is transported to the air-conditioning room 18 at the air volume set in each circulation fan 6. Thus, the indoor temperature and indoor humidity of each living room 2 are controlled to become the target room temperature and target room humidity.

[0039] In this embodiment, although it has been described that both the temperature and humidity of the air-conditioned room 18 are controlled, it is also possible to control only one of the temperature and humidity of the air-conditioned room 18. Furthermore, although it has been described that both the indoor temperature and indoor humidity of each living room 2 are controlled, it is also possible to control only one of the indoor temperature and indoor humidity of each living room 2.

[0040] The system controller 10 also controls the ventilation device based on the carbon dioxide concentration of the room 2 (rooms 2c and 2d in this embodiment) in which the mobile terminal 100 is present, which is acquired by the carbon dioxide measurement unit 101. Here, as an example of the ventilation device according to the present disclosure, the ventilation device according to this embodiment will be described as being a transport fan 3 (transport fans 3a to 3d), a circulation fan 6 (circulation fans 6a to 6d), an exhaust fan 5 (exhaust fans 5a to 5d), and an outside air introduction fan 4. That is, the central air conditioning system 20 includes the transport fan 3, the circulation fan 6, the exhaust fan 5, and the outside air introduction fan 4 as ventilation devices for ventilating each room 2. The system controller 10 controls the ventilation device so that the carbon dioxide concentration of the room 2 becomes a set carbon dioxide concentration (hereinafter, also referred to as a "target carbon dioxide concentration"). The detailed control content will be described later.

[0041] Here, the system controller 10 and the above-mentioned controlled objects are connected by wireless communication, which makes it possible to eliminate the need for complicated wiring work. However, at least some of these controlled objects may be configured to be able to communicate with the system controller 10 by wired communication.

[0042] The input / output terminal 19 is communicatively connected to the system controller 10 via wireless communication, accepts input of information necessary for constructing the central air-conditioning system 20, and stores it in the system controller 10. The input / output terminal 19 also acquires and displays the status of the central air-conditioning system 20 from the system controller 10. Examples of the input / output terminal 19 include mobile information terminals such as mobile phones, smartphones, and tablets.

[0043] The input / output terminal 19 does not necessarily need to be connected to the system controller 10 via wireless communication, and may be connected to the system controller 10 so as to be communicatively connected via wired communication. In this case, the input / output terminal 19 may be realized by, for example, a wall-mounted remote controller. Also, the input / output terminal 19 and the system controller 10 may be integrated into one structure.

[0044] In this embodiment, a case will be described where only one mobile terminal 100 exists in the living room 2. Specifically, this is the case where only the mobile terminal 100a exists in the living room 2c shown in FIG.

[0045] Next, the system controller 10 according to the present embodiment will be described in detail. First, each function of the system controller 10 according to the present embodiment will be described with reference to Fig. 2. Fig. 2 is a schematic functional block diagram of the system controller 10 and peripheral devices.

[0046] The system controller 10 includes a concentration acquisition section 310 , a sleep preparation detection section 320 , a concentration storage section 300 , a control section 200 , a vital data acquisition section 330 , a sleep state determination section 340 , and a determination section 350 .

[0047] The concentration acquisition unit 310 acquires the carbon dioxide concentration measured by the carbon dioxide measurement unit 101. In the present embodiment, as described above, the carbon dioxide measurement unit 101 is provided in the mobile terminal 100, and it can be said that the concentration acquisition unit 310 acquires the carbon dioxide concentration in the room 2 in which the mobile terminal 100 exists.

[0048] The vital data acquisition unit 330 acquires vital data of the user. Here, vital data is basic information related to the life of the user, and in this embodiment, it is defined as at least one of the following data: blood pressure, heart rate, respiration, and body movement of the user. Here, respiration refers to the number of breaths taken per unit time, the depth of respiration, etc., and body movement refers to the magnitude of bodily movement. The vital data acquisition unit 330 acquires vital data via, for example, a vital sensor, etc.

[0049] The sleep state determination section 340 acquires vital data from the vital data acquisition section 330, and determines whether the user is in an active state, a sleep preparation state, a sleep state, a sleeping state, or an awake state based on the acquired vital data.

[0050] Here, each state of the user will be described.

[0051] An active state refers to a state in which the user is awake and active, and examples include the user exercising, eating, working, studying, etc.

[0052] The sleep preparation state refers to a state in which the user is preparing to go to sleep from an active state, and an example of this is when the user gets into bed to fall asleep. In the sleep preparation state, the user is still awake and has not yet fallen asleep.

[0053] The sleep onset state refers to a state in which the user goes from the sleep preparation state to falling asleep.

[0054] The sleep state refers to a state in which sleep continues after the hypnotic state. In other words, in the sleep state, the user loses consciousness and ceases activity.

[0055] The awake state refers to a state in which the user has woken up from a sleep state, and an example of this is when the user wakes up in the morning.

[0056] The user first transitions from an active state to a sleep preparation state, then to a sleep onset state, then to a sleep state, and finally to an awake state.

[0057] As an example of judging a user's state, it is known that the heart rate decreases when falling asleep, and this allows the sleep onset state to be judged. The sleep preparation state can be judged based on the heart rate before entering the sleep onset state. The above is one example of a judgment method, and it is sufficient if the user's state can be judged by a combination of other factors including blood pressure, respiration, body movement, and heart rate.

[0058] The sleep preparation detection section 320 detects that the user in the living room 2 is in a state of preparation for sleep. That is, when the sleep state determination section 340 determines that the user is in a state of preparation for sleep, using the vital data acquired from the vital data acquisition section 330, the sleep preparation detection section 320 detects that the user is in a state of preparation for sleep. That is, the sleep preparation detection section 320 detects that the user is in a state of preparation for sleep, based on the vital data acquired from the vital data acquisition section 330.

[0059] The concentration storage unit 300 is a so-called memory that stores information indicating a carbon dioxide concentration for concentration comparison, which is used when the control unit 200 determines the level of the carbon dioxide concentration in the living room 2. Specifically, in this embodiment, the concentration storage unit 300 stores a first threshold, a second threshold, a third threshold, and concentration information at the time of sleep indicating a carbon dioxide concentration at the time of sleep of a user who owns the mobile terminal 100. The first threshold and the second threshold exist for each living room 2, and are stored in the concentration storage unit 300. However, in this embodiment, as described above, a case where only the mobile terminal 100a exists in the living room 2c is described as an example. Therefore, unless otherwise specified, in this embodiment, the first threshold of the living room 2c and the second threshold of the living room 2c are simply described as the first threshold and the second threshold, respectively.

[0060] The first threshold is a value indicating a carbon dioxide concentration suitable for the user to fall asleep, for example, a value indicating the carbon dioxide concentration when the user fell asleep in the past. The first threshold may be an experimentally obtained value as a carbon dioxide concentration at which the user is expected to fall asleep, and can be set arbitrarily. In addition, it is generally considered that a carbon dioxide concentration that is somewhat higher than the carbon dioxide concentration in an active state makes it easier for the user to transition from a sleep preparation state to a sleep state.

[0061] The second threshold is a value greater than the first threshold and lower than a carbon dioxide concentration considered to be harmful to the human body. The carbon dioxide concentration considered to be harmful to the human body is, for example, a value obtained experimentally or a value published in a research paper. In other words, the range of carbon dioxide concentrations indicated by the first threshold and the second threshold can be within a range of carbon dioxide concentrations considered to be suitable for falling asleep. In other words, the second threshold is a value within the range of carbon dioxide concentrations defined as suitable for falling asleep and lower than a carbon dioxide concentration considered to be harmful to the human body.

[0062] The third threshold is a value smaller than the first threshold and indicates a carbon dioxide concentration suitable for the user's activity state, for example, 1000 ppm, which is a carbon dioxide concentration standard value established for the purpose of ensuring a hygienic environment in buildings such as buildings and department stores.

[0063] The carbon dioxide concentration at the time of falling asleep corresponding to the mobile terminal 100 will be described with reference to Fig. 3. Fig. 3 is a diagram showing the data configuration of a carbon dioxide concentration at the time of falling asleep table 301 stored in the concentration storage unit 300. In this embodiment, it is assumed that a user A carries the mobile terminal 100a.

[0064] As shown in Fig. 3, the sleep carbon dioxide concentration table 301 stores, for each user, terminal information 302 and sleep concentration information 303 in association with each other. Here, the terminal information 302 is information indicating the mobile terminal 100 possessed by the user, and the sleep concentration information 303 is information indicating the carbon dioxide concentration at the time of the user's falling asleep. In the figure, as an example, the sleep carbon dioxide concentration table 301 indicates that the terminal information 302 is "mobile terminal 100a" and the sleep concentration information 303 is "CO2a". That is, in the example of the figure, it is indicated that the carbon dioxide concentration at the time of falling asleep of user A who possesses "mobile terminal 100a" is "CO2a".

[0065] Data is registered in the sleep carbon dioxide concentration table 301 as follows. That is, the control unit 200 acquires the carbon dioxide concentration CO2a in the room 2 measured by the carbon dioxide measurement unit 101a when the user A previously fell asleep from the concentration acquisition unit 310, and stores it in the concentration storage unit 300. That is, the sleep concentration information "CO2a" is registered in the sleep carbon dioxide concentration table 301 in association with the terminal information "mobile terminal 100a" corresponding to the carbon dioxide measurement unit 101a. In this way, the concentration storage unit 300 stores the carbon dioxide concentration CO2a at the time of falling asleep corresponding to the mobile terminal 100a.

[0066] In other words, the concentration storage section 300 stores concentration information at the time of falling asleep that indicates the carbon dioxide concentration at the time when the user A fell asleep.

[0067] The determination unit 350 determines the room 2 in which the mobile terminal 100 exists. As a method of determination, for example, the determination is made based on the radio wave intensity received by the exhaust fans 5a-5d from the mobile terminal 100. In this embodiment, the mobile terminal 100a exists in the room 2c, and therefore the determination method will be briefly described.

[0068] First, the exhaust fans 5a-5d in each room 2 acquire the radio wave intensity generated from the mobile terminal 100a and transmit it to the system controller 10. Then, the determination unit 350 compares the radio wave intensities from the mobile terminal 100a acquired from the exhaust fans 5a-5d in each room 2, and determines that the mobile terminal 100a is present in the room 2 in which the exhaust fan 5 that received the strongest radio wave intensity is located.

[0069] In this embodiment, the radio wave intensity from the mobile terminal 100a acquired by the exhaust fans 5a to 5d is the strongest from the exhaust fan 5c, and therefore the mobile terminal 100a is determined to be present in the room 2c. Also, the radio wave intensity may be acquired from the transport fan 3 instead of the exhaust fan 5.

[0070] Furthermore, instead of using radio wave intensity for the determination, a camera may be provided in each room 2, and the user carrying the mobile terminal 100 may be recognized from the camera image to determine the room 2 in which the mobile terminal 100 is located. Furthermore, the user may notify the system controller 10 via the mobile terminal 100 of which room 2 the user is in, so that the determination unit 350 may determine the room 2 in which the mobile terminal 100 is located.

[0071] The control unit 200 controls ventilation by the ventilator based on the detection result of the sleep preparation detection unit 320 and the carbon dioxide concentration measured by the carbon dioxide measurement unit 101. The control unit 200 further includes a ventilation determination unit 220 and a ventilation control unit 210. The ventilation determination unit 220 further includes a concentration comparison unit 221.

[0072] The concentration comparison unit 221 compares the carbon dioxide concentration acquired by the concentration acquisition unit 310 with the first threshold, second threshold, and third threshold stored in the concentration memory unit 300, and compares whether the acquired carbon dioxide concentration is greater or smaller than each threshold.

[0073] The ventilation determination unit 220 determines the ventilation instruction content to the ventilation control unit 210 based on the result of the comparison by the concentration comparison unit 221, the sleep preparation state of the user detected by the sleep preparation detection unit 320, and the room 2 in which the mobile terminal 100 exists determined by the determination unit 350. The detailed determination method will be described later with reference to the flowchart in FIG.

[0074] The ventilation control unit 210 controls the ventilation device according to the instruction content determined by the ventilation determination unit 220.

[0075] Here, the system controller 10 is composed of a microcomputer. That is, the system controller 10 has a computer system having a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The system controller 10 is connected to each part through a driver and an internal bus. The CPU uses, for example, the RAM as a working area, executes a program stored in the ROM, and controls each operation by sending and receiving data and instructions based on the execution result, so that the computer system functions as the system controller 10. Note that, although the program executed by the CPU is pre-recorded in the ROM here, it may be provided by being recorded in a non-transitory recording medium such as a memory card, or may be provided through an electric communication line such as the Internet.

[0076] In the above configuration, the ventilation control executed by the system controller 10 according to this embodiment will be described with reference to the sleep-onset carbon dioxide concentration table 301 in Fig. 3 and the flowchart in Fig. 4. Fig. 4 is a flowchart showing the ventilation control executed by the system controller 10. In the flowchart, numbers are assigned starting with the initial letter S. For example, S1 indicates a processing step. However, the magnitude of the numerical value indicating the processing step has no relation to the processing order.

[0077] First, the concentration acquisition unit 310 acquires the carbon dioxide concentration of the air in the living room 2 (step S1). The carbon dioxide concentration of the air in the living room 2 acquired by the concentration acquisition unit 310 is measured by a carbon dioxide measurement unit 101 provided in a mobile terminal 100 carried by a user present in the living room 2. The determination unit 350 also determines in which room (in this embodiment, 2a, 2b, 2c, or 2d) the room 2 in which the mobile terminal 100 exists is located. This makes it possible to know the carbon dioxide concentration of the room 2 in which the user exists. In this embodiment, the determination unit 350 determines that the mobile terminal 100a carried by user A exists in room 2c.

[0078] Next, the sleep preparation detection section 320 detects whether the user is in a sleep preparation state based on the determination result of the sleep state determination section 340 (step S2).

[0079] If the sleep preparation detection unit 320 detects that the user is not in a sleep preparation state, the concentration comparison unit 221 compares the carbon dioxide concentration in the living room 2 in which the user is present with the third threshold value (step S2: No → step S3). In this embodiment, when the user A is not in a sleep preparation state, the concentration comparison unit 221 compares the carbon dioxide concentration in the living room 2c with the third threshold value.

[0080] If the carbon dioxide concentration in room 2 where the user exists is equal to or higher than the third threshold, ventilation determination unit 220 instructs ventilation control unit 210 to ventilate room 2 where the user exists. Ventilation control unit 210 operates a fan of the ventilation device to control the carbon dioxide concentration in room 2 where the user exists to be reduced. As a result, the carbon dioxide concentration in room 2 becomes a concentration suitable for an active state, allowing the user to maintain concentration when in an active state. Note that ventilation of room 2 where the user exists in step S3 may be performed only when the sleep state determination unit 340 has determined that the user is in an active state.

[0081] When the sleep preparation detection section 320 detects that the user is in a sleep preparation state, the control section 200 changes the first threshold value of the room 2 in which the mobile terminal 100 exists, which is stored in the concentration storage section 300, as follows. That is, the control section 200 changes the first threshold value to the same value as the carbon dioxide concentration indicated in the concentration information at the time of sleep of the user corresponding to the mobile terminal 100, which is stored in the concentration storage section 300 (step S2: Yes -> step S4). In this embodiment, the control section 200 changes the first threshold value of the room 2c to the carbon dioxide concentration CO2a indicated in the concentration information at the time of sleep of the user A, which is stored in the concentration storage section 300.

[0082] This allows the first threshold value for room 2c to be set to a carbon dioxide concentration suitable for user A to fall asleep. Thus, in step S4, control unit 200 changes the first threshold value based on the carbon dioxide concentration at the time of falling asleep indicated by the concentration information at the time of falling asleep stored in concentration storage unit 300. Then, as described below, control unit 200 controls ventilation by the ventilator based on the changed first threshold value.

[0083] In addition, since the carbon dioxide concentration at the time when the user in the room 2 falls asleep becomes the first threshold value, even if the user changes the room 2 where he or she prepares for sleep, the first threshold value for the changed room 2 can be set to a carbon dioxide concentration at the time when the user falls asleep that is suitable for the user. For example, even if the user changes the room 2 where he or she prepares for sleep from room 2c to room 2a, the first threshold value for the changed room 2a can be set to a carbon dioxide concentration at the time when the user falls asleep that is suitable for the user. In addition, since the settable range of the second threshold value changes with the change in the first threshold value, the second threshold value is changed as necessary. In other words, the second threshold value can be said to be a value that reflects the change in the first threshold value.

[0084] Next, the concentration comparison unit 221 compares the carbon dioxide concentration in the room 2 with the second threshold value (step S5).

[0085] If the carbon dioxide concentration in room 2 where the user in the sleep preparation state exists is equal to or higher than the second threshold, ventilation determination unit 220 instructs ventilation control unit 210 to ventilate room 2 where the user exists. Ventilation control unit 210 controls the ventilation device to operate a fan to lower the carbon dioxide concentration in room 2 (step S5: Yes → step S6). That is, when sleep preparation detection unit 320 detects that the user is in the sleep preparation state, and the carbon dioxide concentration measured by carbon dioxide measurement unit 101 is equal to or higher than the second threshold, control unit 200 controls the ventilation device to perform ventilation.

[0086] This allows the room 2 in which the user is present to maintain a carbon dioxide concentration within a range that is considered suitable for falling asleep. It also makes it possible to prevent the room 2 in which the user is present from reaching a carbon dioxide concentration that is dangerous to the user's body.

[0087] On the other hand, if the carbon dioxide concentration in the room 2 in which the user is in the sleep preparation state is smaller than the second threshold, the ventilation determination unit 220 instructs the ventilation control unit 210 to stop ventilation of the room 2 in which the user is in the sleep preparation state. The ventilation control unit 210 stops the fan of the ventilation device (step S5: No → step S7). That is, when the sleep preparation detection unit 320 detects that the user is in the sleep preparation state, and the carbon dioxide concentration measured by the carbon dioxide measurement unit 101 is smaller than the second threshold, the control unit 200 controls the ventilation by the ventilation device to stop. In other words, when the sleep preparation detection unit 320 detects that the user is in the sleep preparation state, the control unit 200 controls the ventilation by the ventilation device as follows. That is, the control unit 200 controls the ventilation by the ventilation device so that the carbon dioxide concentration in the room 2 acquired by the concentration acquisition unit 310 approaches the carbon dioxide concentration at the time of the user falling asleep indicated by the concentration information at the time of falling asleep stored in the concentration storage unit 300. In this control, the control unit 200 uses, as the sleep-onset concentration information stored in the concentration storage unit 300, the sleep-onset concentration information corresponding to the terminal information indicating the mobile terminal 100 carried by the user present in the room 2.

[0088] In other words, when the user is not in a sleep preparation state, as described above, ventilation is performed when the carbon dioxide concentration in room 2 in which the user is present exceeds the third threshold. In contrast, when the user is in a sleep preparation state, ventilation is not performed even if the carbon dioxide concentration in room 2 exceeds the third threshold or the first threshold, but ventilation is performed when it exceeds the second threshold. As a result, when the user is in a sleep preparation state, the carbon dioxide concentration in room 2 is aimed for to be greater than the first threshold and less than the second threshold.

[0089] This makes it possible to further increase the carbon dioxide concentration in room 2 in which the user exists, and therefore the central air-conditioning system 20 can facilitate the user's transition to a sleep-onset state. In other words, the central air-conditioning system 20 can shorten the time it takes for the user to enter a sleep-onset state after entering a sleep preparation state.

[0090] Next, the sleep state determination unit 340 determines whether the user has fallen asleep (step S8).

[0091] If the user has not transitioned to a sleep state, the process returns to step S5 in order to further increase the carbon dioxide concentration in room 2 (step S8: No→step S5). This enables central air-conditioning system 20 to further facilitate the user's transition from the sleep preparation state to the sleep state.

[0092] Then, when the user has entered a sleep state, the system controller 10 ends the ventilation control process (step S8: Yes).

[0093] The central air conditioning system 20 has been described above as an example of a ventilation system according to the present disclosure. The central air conditioning system (20) is characterized by including a carbon dioxide measurement unit (101), a ventilation device, a sleep preparation detection unit (320), and a control unit (200). The carbon dioxide measurement unit (101) measures the carbon dioxide concentration in a living room (2), which is an example of a predetermined space according to the present disclosure. The ventilation device ventilates the living room (2) when the carbon dioxide concentration measured by the carbon dioxide measurement unit (101) is equal to or higher than a predetermined threshold (third threshold). The sleep preparation detection unit (320) detects that a user in the living room (2) is in a state of sleep preparation. The control unit (200) controls the ventilation device to stop ventilation when the sleep preparation detection unit (320) detects that the user is in a state of sleep preparation, even if the carbon dioxide concentration measured by the carbon dioxide measurement unit (101) is equal to or higher than the predetermined threshold (third threshold). As a result, when the user is preparing to sleep, the central air-conditioning system (20) does not perform ventilation using the ventilation device even if the carbon dioxide concentration in the living room (2) in which the user is present is higher than a predetermined threshold value (third threshold value). Therefore, the central air-conditioning system (20) contributes to realizing a space suitable for the user to fall asleep without disturbing the user from falling asleep.

[0094] (Embodiment 2) In this embodiment, a case where multiple mobile terminals 100 exist in the living room 2 will be described. That is, there are multiple users in this embodiment. Specifically, this is a case where mobile terminals 100b and 100c exist in the living room 2d shown in FIG. 1. Note that, in this embodiment, for the sake of simplicity, it is assumed that the only mobile terminals 100 present in the general residence 1 are mobile terminals 100b and 100c, and that mobile terminal 100a does not exist in living room 2c.

[0095] First, referring to Fig. 5, the functions of the system controller 10A according to this embodiment will be described. Fig. 5 is a schematic functional block diagram of the system controller 10A and peripheral devices according to this embodiment. The basic configuration of the system controller 10A is the same as that of the system controller 10 according to the first embodiment, but the system controller 10A is different from the system controller 10 in that the system controller 10A includes a control unit 200A instead of the control unit 200 of the system controller 10. The control unit 200A is different from the control unit 200 in that the control unit 220A is provided instead of the ventilation determination unit 220 of the control unit 200 according to the first embodiment. The system controller 10A is also provided with a determination unit 350A instead of the determination unit 350 of the system controller 10.

[0096] The system controller 10A includes a concentration acquisition section 310, a sleep preparation detection section 320, a concentration storage section 300, a control section 200A, a vital data acquisition section 330, a sleep state determination section 340, and a determination section 350A.

[0097] The concentration acquiring section 310, the vital data acquiring section 330, the sleep state determining section 340, and the sleep preparation detecting section 320 are the same as those in the first embodiment, and therefore description thereof will be omitted.

[0098] The first threshold, second threshold and third threshold stored in the concentration storage unit 300 are the same as those in the first embodiment, but the concentration storage unit 300 stores a sleep-onset carbon dioxide concentration table 304 instead of the sleep-onset carbon dioxide concentration table 301 according to the first embodiment. The sleep-onset carbon dioxide concentration table 304 corresponding to the mobile terminal 100 will be described with reference to FIG. 6.

[0099] FIG. 6 is a diagram showing a data configuration of the sleep-onset carbon dioxide concentration table 304 stored in the concentration storage unit 300. As shown in FIG.

[0100] Each user carries a mobile terminal 100. In this embodiment, user B carries a mobile terminal 100b, and user C carries a mobile terminal 100c.

[0101] The data configuration of the sleep carbon dioxide concentration table 304 is the same as that of the sleep carbon dioxide concentration table 301 according to the first embodiment, but the data registered in the sleep carbon dioxide concentration table 304 is different from that in the sleep carbon dioxide concentration table 301. That is, the sleep carbon dioxide concentration table 304 stores the terminal information 305 of the user and the sleep concentration information 306 of the user in association with each other for each of a plurality of users. In the figure, as an example, the sleep carbon dioxide concentration table 304 indicates that the terminal information 305 is "mobile terminal 100b" and the sleep concentration information 306 is "CO2b". Also, in the figure, as an example, the sleep carbon dioxide concentration table 304 indicates that the terminal information 305 is "mobile terminal 100c" and the sleep concentration information 306 is "CO2c". That is, in the example of the figure, the carbon dioxide concentration in the room 2d at the time of sleep of the user B who owns the "mobile terminal 100b" is "CO2b". Also, in the example shown in the figure, the carbon dioxide concentration in room 2d when user C who owns "mobile terminal 100c" falls asleep is "CO2c."

[0102] The method of registering data in the sleep carbon dioxide concentration table 304 is the same as the method of registering data in the sleep carbon dioxide concentration table 301 according to the first embodiment. That is, the control unit 200A acquires the carbon dioxide concentration CO2b of the room 2 measured by the carbon dioxide measurement unit 101b when the user B fell asleep in the past from the concentration acquisition unit 310 and stores it in the concentration storage unit 300. That is, the control unit 200A registers the sleep concentration information "CO2b" in the sleep carbon dioxide concentration table 304 in association with the terminal information "mobile terminal 100b" corresponding to the carbon dioxide measurement unit 101b. Similarly, the control unit 200A acquires the carbon dioxide concentration CO2c of the room 2 measured by the carbon dioxide measurement unit 101c when the user C fell asleep in the past from the concentration acquisition unit 310 and stores it in the concentration storage unit 300. That is, the control unit 200A registers the sleep concentration information "CO2c" in the sleep carbon dioxide concentration table 304 in association with the terminal information "mobile terminal 100c" corresponding to the carbon dioxide measurement unit 101c.

[0103] As a result, the concentration storage unit 300 stores the carbon dioxide concentration CO2b at the time of falling asleep corresponding to the mobile terminal 100b and the carbon dioxide concentration CO2c at the time of falling asleep corresponding to the mobile terminal 100c. In other words, the concentration storage unit 300 stores individual concentration information at the time of falling asleep indicating the carbon dioxide concentration at the time of falling asleep for all users.

[0104] In the present embodiment, the case where two mobile terminals 100 are present in the central air-conditioning system according to the present embodiment is taken as an example, but the number of mobile terminals 100 may be any number. The concentration storage unit 300 stores sleep-onset concentration information indicating the carbon dioxide concentration at the time of falling asleep of all users who carry the mobile terminals 100.

[0105] The determination unit 350A determines the room 2 in which the mobile terminal 100 exists as in the first embodiment, but also determines the number of mobile terminals 100 present in each of the rooms 2a to 2d. As a method of determination, for example, the determination is made based on the radio wave intensity received by the exhaust fans 5a to 5d from the mobile terminal 100 as in the first embodiment.

[0106] In this embodiment, exhaust fans 5a-5d in each room 2 acquire the radio wave intensity generated from mobile terminals 100b and 100c and transmit it to system controller 10A. Then, determination unit 350A compares the radio wave intensity from each of mobile terminals 100b and 100c acquired from exhaust fans 5a-5d in each room 2, and determines that mobile terminal 100 is present in room 2 where exhaust fan 5 that received the strongest radio wave intensity is located.

[0107] Of the radio wave strengths from the mobile terminals 100b and 100c picked up by the exhaust fans 5a to 5d, the exhaust fan 5d has the strongest radio wave strength, and so it is determined that the mobile terminals 100b and 100c are present in the room 2d. Therefore, it is determined that the two mobile terminals 100b and 100c are present in the room 2d.

[0108] In this embodiment, the case where there are two mobile terminals 100 is taken as an example, but the same determination is also performed when there are three or more mobile terminals 100 to determine the mobile terminals 100 present in room 2 and the number of mobile terminals 100.

[0109] The control unit 200A further includes a ventilation determination unit 220A and a ventilation control unit 210. The ventilation determination unit 220A further includes a concentration comparison unit 221A and a threshold change unit 222.

[0110] The concentration comparison unit 221A is similar to the concentration comparison unit 221 according to the first embodiment in that it uses the carbon dioxide concentration acquired by the concentration acquisition unit 310 to make a comparison with each threshold value stored in the concentration storage unit 300, but differs from the concentration comparison unit 221 in the following respects. That is, when there are multiple users in a certain room 2, the concentration comparison unit 221A makes a comparison using the average value of the carbon dioxide concentration acquired by the concentration acquisition unit 310 via the carbon dioxide measurement unit 101 of the mobile terminal 100 carried by each user. The details of the comparison will be described later.

[0111] When the sleep preparation detection unit 320 detects the user's sleep preparation state, the threshold change unit 222 changes the first threshold based on the sleep onset concentration information corresponding to the mobile terminal 100 stored in the concentration memory unit 300, as will be described in detail later.

[0112] The ventilation determination unit 220A determines the ventilation instruction content to the ventilation control unit 210 based on the comparison result of the concentration comparison unit 221A, the value of the first threshold changed by the threshold change unit 222, the sleep preparation state of the user detected by the sleep preparation detection unit 320, and the number of mobile terminals 100 present in the room 2 determined by the determination unit 350A. The detailed control will be described later with reference to the flowchart in FIG.

[0113] The ventilation control unit 210 is the same as in the first embodiment, and therefore a description thereof will be omitted.

[0114] In the above configuration, the ventilation control executed by the system controller 10A will be described with reference to the flowchart in Fig. 7. Fig. 7 is a flowchart showing the ventilation control executed by the system controller 10A. In the flowchart, numbers are assigned starting with the initial letter S. For example, S11 indicates a processing step. However, the magnitude of the numerical value indicating the processing step has no relation to the processing order.

[0115] First, the concentration acquisition unit 310 acquires the carbon dioxide concentration in the room 2 (step S11).

[0116] Furthermore, the determination unit 350A determines in which room 2 the mobile terminal 100 exists and the number of mobile terminals 100 existing in the room 2. In this embodiment, the determination unit 350A determines that the mobile terminal 100b carried by the user B and the mobile terminal 100c carried by the user C exist in the room 2d, and the number of mobile terminals 100 existing in the room 2d is two.

[0117] Next, the sleep preparation detection unit 320 detects whether the user is in a sleep preparation state (step S12). In this embodiment, when multiple users exist in a certain living room 2, the sleep preparation detection unit 320 detects that the user is in a sleep preparation state if there is even one user in the sleep preparation state. However, this is only an example, and the sleep preparation detection unit 320 may detect that the user is in a sleep preparation state if all users are in the sleep preparation state.

[0118] If the sleep preparation detection unit 320 detects that the user is not in a state of preparation for sleep, the concentration comparison unit 221A compares the carbon dioxide concentration in the room 2 in which the user is present with the third threshold value (step S12: No → step S13).

[0119] In this embodiment, there are multiple users in the room 2d, and multiple carbon dioxide measuring units 101 are also present. In this case, the concentration comparing unit 221A calculates the average value of the carbon dioxide concentrations obtained from the carbon dioxide measuring units 101b and 101c, and compares the calculated average value with the third threshold value. Note that, although the average value is used in this embodiment, the larger carbon dioxide concentration may be used instead of the average value, or may be set arbitrarily between the minimum and maximum values. The same applies when three or more carbon dioxide measuring units 101 are present.

[0120] If the calculated average carbon dioxide concentration is equal to or greater than the third threshold, the ventilation determination unit 220A instructs the ventilation control unit 210 to ventilate the room 2 in which the user is present. The ventilation control unit 210 operates the fan of the ventilation device to control the carbon dioxide concentration in the room 2 in which the user is present to decrease.

[0121] When the sleep preparation detection section 320 detects that the user is in a sleep preparation state, the threshold change section 222 specifies a threshold based on the sleep-onset concentration information of the user corresponding to the mobile terminal 100 stored in the concentration storage section 300. Then, the control section 200A changes the first threshold stored in the concentration storage section 300 to the threshold specified by the threshold change section 222 (Step S12: Yes → Step S14).

[0122] A specific description of this embodiment will be given using the carbon dioxide concentration at sleep onset table 304 in Fig. 6. A user B and a user C exist in the living room 2d. The concentration information at sleep onset "CO2b" of the user B who exists in the living room 2d and the concentration information at sleep onset "CO2c" of the user C who exists in the living room 2d are stored in the carbon dioxide concentration at sleep onset table 304 of the concentration storage unit 300. The threshold value changing unit 222 specifies the higher of the carbon dioxide concentration CO2b at the time when user B falls asleep and the carbon dioxide concentration CO2c at the time when user C falls asleep as the threshold value, and changes the first threshold value to the specified threshold value.

[0123] This allows the first threshold value for room 2d to be set to a carbon dioxide concentration suitable for both user B and user C to fall asleep.

[0124] In this embodiment, the first threshold is changed to the higher of the carbon dioxide concentration CO2b when user B falls asleep and the carbon dioxide concentration CO2c when user C falls asleep. However, it may also be changed to, for example, the average of the two carbon dioxide concentrations.

[0125] When three or more users carrying the mobile terminal 100 in the same room 2 are in a sleep preparation state, the threshold change unit 222 changes the first threshold in the same manner. That is, the threshold change unit 222 specifies the maximum or average carbon dioxide concentration among the carbon dioxide concentrations at the time of falling asleep of the users corresponding to the mobile terminal 100 stored in the concentration storage unit 300 as the threshold, and changes the first threshold to the specified threshold. In addition, since the settable range of the second threshold changes with the change in the first threshold, the second threshold is changed as necessary. That is, the second threshold can be said to be a value reflecting the change in the first threshold. In this way, in step S14, the control unit 200A changes the first threshold based on the carbon dioxide concentration at the time of falling asleep indicated by the concentration information at the time of falling asleep stored in the concentration storage unit 300. Then, as described later, the control unit 200A controls ventilation by the ventilation device based on the second threshold based on the changed first threshold.

[0126] Next, the concentration comparison unit 221A uses the carbon dioxide concentration in the room 2 to compare with the second threshold value (step S15). Specifically, similar to step S13, the concentration comparison unit 221A calculates the average value of the carbon dioxide concentrations acquired from the concentration acquisition unit 310, and compares the calculated average value with the second threshold value. In this embodiment, the concentration comparison unit 221A compares the average value of the carbon dioxide concentrations acquired from the carbon dioxide measurement units 101b and 101c with the second threshold value. Note that, similar to step S13, the average value is used in this embodiment, but the larger carbon dioxide concentration may be used instead of the average value, or may be set arbitrarily between the minimum value and the maximum value. The same applies when three or more carbon dioxide measurement units 101 are present.

[0127] If the calculated average value of the carbon dioxide concentration is equal to or greater than the second threshold value, the ventilation determination unit 220A instructs the ventilation control unit 210 to ventilate the room 2 in which the user is present. The ventilation control unit 210 operates the fan of the ventilation device to control it to lower the carbon dioxide concentration in the room 2 (Step S15: Yes → Step S16).

[0128] If the calculated average value of the carbon dioxide concentration is smaller than the second threshold, the ventilation determination unit 220A instructs the ventilation control unit 210 to stop ventilation of the room 2 in which the user is present. The ventilation control unit 210 stops the fan of the ventilation device (step S15: No → step S17). That is, when the sleep preparation detection unit 320 detects that the user is in the sleep preparation state and the determination unit 350A determines that there are multiple mobile terminals 100, the control unit 200A performs control as follows. That is, the control unit 200A acquires sleep-onset concentration information corresponding to each of the multiple terminal information indicating each of the multiple mobile terminals 100 determined by the determination unit 350A, which is stored in the concentration storage unit 300. Then, the control unit 200A controls ventilation by the ventilation device so that the carbon dioxide concentration of the room 2 acquired by the concentration acquisition unit 310 approaches the maximum carbon dioxide concentration among the carbon dioxide concentrations at the time of sleep indicated by each of the acquired sleep-onset concentration information. That is, the second threshold reflects the change in the first threshold. Based on this second threshold value, the control unit 200A controls ventilation by the ventilation device so that the carbon dioxide concentration in the room 2 acquired by the concentration acquisition unit 310 approaches the maximum carbon dioxide concentration at the time of falling asleep indicated by the concentration information at the time of falling asleep corresponding to each of the multiple terminal information.

[0129] Next, the sleep state determination unit 340 determines whether or not all users in the room 2 who are in the sleep preparation state have fallen asleep (step S18).

[0130] In this embodiment, the sleep state determination unit 340 determines whether or not the user B and the user C in the room 2d have fallen asleep. When there are three or more users, the same determination is made.

[0131] If all users in room 2 who are in the sleep preparation state have not yet gone to sleep, the process returns to step S15 to further increase the carbon dioxide concentration in room 2 (step S18: No→step S15).

[0132] As a result, the central air-conditioning system according to the present embodiment can make it easier for a user who has not yet transitioned into a sleep state to transition into a sleep state.

[0133] Then, when all the users have transitioned to sleep, the system controller 10A ends the ventilation control process (step S18: Yes).

[0134] As an example of the ventilation system according to the present disclosure, the central air-conditioning system 20 and the system controller 10 according to the first embodiment, and the central air-conditioning system and the system controller 10A according to the second embodiment have been described above.

[0135] (Modification) As described above, the central air conditioning systems according to the above-mentioned first and second embodiments are examples of the ventilation system according to the present disclosure, and the scope of the present disclosure is not limited to the contents of the first and second embodiments.

[0136] For example, the central air-conditioning systems according to the first and second embodiments may be modified so that concentration information at the time of sleep, which indicates the carbon dioxide concentration at the time the user falls asleep, is not stored in the concentration storage unit 300. In the central air-conditioning system according to this modification, the first threshold value and the second threshold value are fixed values, and the system can be made to perform simpler control.

[0137] In the central air-conditioning systems according to the first and second embodiments, the carbon dioxide measuring unit 101 is provided in the mobile terminal 100, but the following modifications may be made. That is, the carbon dioxide measuring unit 101 may be provided in a ventilation device, a lighting device, an operation switch for a ventilation device, an operation switch for a lighting device, or a power outlet, etc., installed in the living room 2. The carbon dioxide measuring unit 101 may also be modified so as to be provided in a home appliance, such as an air purifier, an electric fan, a dehumidifier, a humidifier, and an air conditioner, installed in the living room 2. The carbon dioxide measuring unit 101 may also be modified so as to be provided independently somewhere in the living room 2. This allows the central air-conditioning systems according to these modifications to have an improved degree of freedom in configuration.

[0138] Also, the sleep preparation detection unit 320 may be modified to detect the sleep preparation state based on information other than the judgment result of the sleep state judgment unit 340. The sleep preparation detection unit according to this modification may be configured to detect that the user is in the sleep preparation state based on, for example, the bedtime set by the user. As a result, the sleep preparation detection unit according to this modification can detect the sleep preparation state of the user relatively easily, and the central air-conditioning system according to this modification can be constructed with a different configuration. Furthermore, the central air-conditioning system according to this modification may be modified so that the carbon dioxide concentration in the living room 2 in which the user is present approaches the first threshold value before the user's bedtime. For example, the central air-conditioning system according to this modification controls to ventilate at the first threshold value or higher, rather than not ventilating even if the carbon dioxide concentration becomes equal to or higher than the third threshold value, one hour before the user's bedtime. As a result, when the user enters the bedtime preparation state, the carbon dioxide concentration in the living room 2 is equal to the first threshold value, so that the central air-conditioning system according to this modification can further shorten the time it takes to fall asleep.

[0139] Further, the sleep preparation detection unit 320 may be modified so as to detect the user's sleep preparation state based on an input by the user indicating that the user himself / herself is in a sleep preparation state, instead of detecting the user's sleep preparation state using vital data or the user's bedtime. For example, a reception unit for receiving the input is provided in the mobile terminal 100, and the user inputs that the user himself / herself is in a sleep preparation state via the mobile terminal 100, and the reception unit receives this input and notifies the system controller 10. This allows the sleep preparation detection unit according to this modification to more accurately detect that the user is in a sleep preparation state. That is, by receiving an input indicating that the user himself / herself is in a sleep preparation state at the reception unit, the sleep preparation detection unit according to this modification can know the user's sleep preparation state. Therefore, the sleep preparation detection unit according to this modification can more accurately and easily detect the user's sleep preparation state. That is, the central air-conditioning system according to this modification further includes a reception unit for receiving an input by the user indicating that the user himself / herself is in a sleep preparation state. Then, the sleep preparation detection unit according to this modification detects that the user is in a sleep preparation state based on the input received by the reception unit.

[0140] Also, the sleep preparation detection unit 320 may be modified to detect that the user is in a sleep preparation state by other methods, such as installing a camera in each room and detecting the user's sleep preparation state from the video. As a result, the central air conditioning system according to this modification can be constructed in various configurations.

[0141] Also, the determination unit 350 according to the first embodiment may be modified so as not to determine the room 2 in which the mobile terminal 100 is present. In this case, for example, information on the room 2 in which the user himself sleeps is registered in advance in the system controller 10 by the user, so that the determination unit according to this modification can identify the room 2 in which the user sleeps. Then, the control unit according to this modification can perform ventilation control for the room 2 registered by the user. Furthermore, the carbon dioxide measuring unit 101 may be provided in a device other than the mobile terminal 100, and the carbon dioxide concentration of the room 2 measured by the carbon dioxide measuring unit 101 when the user fell asleep in the past may be stored in the concentration storage unit 300. As a result, the central air-conditioning system according to this modification can perform the same control as the ventilation control according to the embodiment even if the mobile terminal 100 is not present. As a result, the central air-conditioning system according to this modification can be constructed in various configurations. Note that this modification of the determination unit 350 may be applied to the determination unit 350A according to the second embodiment.

[0142] In addition, in the first embodiment, the control of the ventilation device is performed by the control unit 200 of the system controller 10, and in the second embodiment, the control unit 200A of the system controller 10A, but these may be modified so that they are performed by the mobile terminal 100. In the central air-conditioning system according to this modification, for example, the mobile terminal 100 may be a smartphone, and software such as an app may be provided to the smartphone to control the ventilation device. As a result, the central air-conditioning system according to this modification can control the ventilation device by a smartphone carried by the user.

[0143] Furthermore, the central air-conditioning systems according to the first and second embodiments may be modified so that ventilation control is performed by a smartphone using a wearable terminal worn by the user, which is separate from the above-mentioned smartphone. In the central air-conditioning system according to this modification, for example, the wearable terminal is provided with a carbon dioxide measuring unit 101 and a vital data measuring unit. Then, the smartphone acquires the measurement data of the carbon dioxide measuring unit 101 and the vital data measuring unit, and performs ventilation control. As a result, the smartphone according to this modification can acquire vital data, and can perform more complicated control.

[0144] In the central air-conditioning systems according to the first and second embodiments, the system controller 10 (or the system controller 10A) installed in the general house 1 controls the ventilation of the ventilation device, but the central air-conditioning system according to this embodiment may be modified to include a cloud and control the ventilation device. This allows the central air-conditioning system according to this modification to have greater freedom in configuration.

[0145] (Summary of the Disclosure) The ventilation system according to the present disclosure is configured to include a ventilation device, a carbon dioxide measuring unit, a sleep preparation detection unit, and a control unit. The ventilation device is for ventilating a specified space. The carbon dioxide measuring unit measures the carbon dioxide concentration in the specified space. The sleep preparation detection unit detects that a user in the specified space is in a state of preparation for sleep. The control unit then controls ventilation by the ventilation device based on the detection result of the sleep preparation detection unit and the carbon dioxide concentration measured by the carbon dioxide measuring unit.

[0146] In this way, the ventilation system according to the present disclosure controls the carbon dioxide concentration in a specified space by the ventilation device based on the detection result that the user is in a sleep preparation state. In other words, the ventilation system according to the present disclosure controls ventilation by the ventilation device taking into account the user's sleep preparation state, so that the carbon dioxide concentration can be made suitable for the user's sleep preparation state. Therefore, the ventilation system according to the present disclosure can be used to realize a space suitable for the user's sleep preparation state.

[0147] The ventilation system according to the present disclosure may further include a concentration storage unit that stores a first threshold value indicating a carbon dioxide concentration suitable for falling asleep and a second threshold value that is greater than the first threshold value. The control unit may be configured to control the ventilation device to stop ventilation when the carbon dioxide concentration measured by the carbon dioxide measuring unit is less than the second threshold value when the sleep preparation detection unit detects that the user is in a state of sleep preparation.

[0148] As a result, the ventilation system according to the present disclosure can increase the carbon dioxide concentration in the space in which the user is present when the user is in a sleep preparation state, thereby realizing a space in which the user can easily fall asleep. Thus, the ventilation system according to the present disclosure can shorten the time it takes for the user to fall asleep after entering the sleep preparation state.

[0149] In addition, the control unit may be configured to control ventilation by the ventilation device when the sleep preparation detection unit detects that the user is in a state of preparation for sleep and the carbon dioxide concentration measured by the carbon dioxide measurement unit is equal to or higher than a second threshold value.

[0150] As a result, the ventilation system according to the present disclosure can prevent an increase in carbon dioxide concentration that would pose a danger to the user's body when the user is preparing to sleep.

[0151] The second threshold value may be a value within a range of carbon dioxide concentrations defined as suitable for falling asleep and lower than a carbon dioxide concentration considered to be harmful to the human body.

[0152] As a result, the ventilation system according to the present disclosure can maintain the carbon dioxide concentration in the space in which the user is present within a carbon dioxide concentration range that is considered suitable for the user to fall asleep.

[0153] The sleep preparation detection unit may be configured to detect that the user is in a state of preparing to sleep based on a bedtime set by the user.

[0154] This allows the ventilation system according to the present disclosure to relatively easily detect the user's state of preparation for sleep based on the time set by the user.

[0155] The ventilation system according to the present disclosure may further include a vital data acquisition unit that acquires at least one of the user's blood pressure, heart rate, respiration, and body movement as vital data. The sleep preparation detection unit may be configured to detect that the user is in a sleep preparation state based on the vital data acquired from the vital data acquisition unit.

[0156] In this way, the ventilation system according to the present disclosure can know the user's state of preparation for sleep from the vital data, and therefore can grasp the user's state of preparation for sleep more accurately.

[0157] In addition, the ventilation system according to the present disclosure may further include a reception unit that receives input from the user indicating that the user is in a state of preparation for sleep, and the sleep preparation detection unit may be configured to detect that the user is in a state of preparation for sleep based on the input received by the reception unit.

[0158] This allows the ventilation system according to the present disclosure to detect that the user is in a sleep preparation state based on an input from the user, thereby enabling the ventilation system according to the present disclosure to more accurately detect the user's sleep preparation state.

[0159] The ventilation system according to the present disclosure may further include a concentration acquisition unit that acquires the carbon dioxide concentration measured by the carbon dioxide measurement unit, and the concentration storage unit may further store sleep-onset concentration information indicating the carbon dioxide concentration at the time of the user falling asleep. The control unit may be configured to control ventilation by the ventilator when the sleep preparation detection unit detects a sleep preparation state such that the carbon dioxide concentration acquired by the concentration acquisition unit approaches the carbon dioxide concentration at the time of the user falling asleep indicated by the sleep-onset concentration information stored in the concentration storage unit.

[0160] As a result, when the user enters the sleep preparation state, the ventilation system according to the present disclosure can bring the carbon dioxide concentration in the space in which the user exists closer to the carbon dioxide concentration at the time the user falls asleep, thereby realizing a space in which the user can easily fall asleep. Thus, the ventilation system according to the present disclosure can shorten the time it takes for the user to fall asleep after entering the sleep preparation state.

[0161] The carbon dioxide measuring unit may also be configured to be provided in at least one of a ventilation device, a lighting device, an operating switch for the ventilation device, an operating switch for the lighting device, a power outlet, a home appliance, and a mobile terminal carried by the user, which are provided in a specified space.

[0162] This allows the ventilation system according to the present disclosure to be constructed in a variety of configurations.

[0163] In addition, the concentration memory unit may be configured to store the sleep onset concentration information in association with terminal information indicating a mobile terminal carried by the user, and the control unit may be configured to use the sleep onset concentration information corresponding to the terminal information as the sleep onset concentration information stored in the concentration memory unit.

[0164] As a result, the ventilation system according to the present disclosure can omit the installation of a carbon dioxide measuring unit in each space by providing a carbon dioxide measuring unit in, for example, a mobile terminal. Also, the ventilation system according to the present disclosure stores the carbon dioxide concentration at the time the user falls asleep in association with the mobile terminal carried by the user. Therefore, for example, when there are multiple predetermined spaces to be ventilated by the ventilation device according to the present disclosure, even if the space in which the user exists changes, the carbon dioxide concentration in that space can be controlled to approach the carbon dioxide concentration at the time the user falls asleep. Therefore, the ventilation system according to the present disclosure can provide a carbon dioxide concentration suitable for the user's sleep preparation state regardless of the space in which the user sleeps.

[0165] The ventilation system according to the present disclosure may further include a determination unit that determines the number of mobile terminals present in the specified space, the number of users being multiple, and the concentration storage unit may store, for each of the multiple users, the concentration information at the time of sleep of the user in association with the terminal information of the user. Then, when the sleep preparation detection unit detects that the user is in a sleep preparation state and the determination unit determines that the number of mobile terminals is multiple, the control unit may control ventilation by the ventilation device as follows. That is, the control unit may be configured to control ventilation by the ventilation device so that the carbon dioxide concentration acquired by the concentration acquisition unit approaches the maximum or average carbon dioxide concentration at the time of sleep indicated by the concentration information at the time of sleep corresponding to each of the multiple terminal information indicating each of the multiple mobile terminals determined by the determination unit, which is stored in the concentration storage unit.

[0166] As a result, even when multiple users carrying mobile devices are present in the same space, the control unit controls the carbon dioxide concentration to approach a carbon dioxide concentration suitable for when all users fall asleep. Therefore, the ventilation system according to the present disclosure can adjust the carbon dioxide concentration in a space where multiple users exist to a carbon dioxide concentration suitable for the sleep preparation state of all users present there.

[0167] The control unit may also be configured to change the first threshold value based on the carbon dioxide concentration at the time of sleep onset indicated by the sleep onset concentration information stored in the concentration memory unit, and to control ventilation by the ventilation device based on the changed first threshold value.

[0168] In this way, the ventilation system according to the present disclosure changes the carbon dioxide concentration suitable for falling asleep in the specified space to the carbon dioxide concentration at the time when the user sleeping in the specified space falls asleep. Therefore, the ventilation system according to the present disclosure can change the carbon dioxide concentration when the user is in a sleep preparation state in the specified space to a carbon dioxide concentration more suitable for the user's sleep preparation state. [Industrial Applicability]

[0169] The present disclosure is useful as a ventilation system for ventilating a predetermined space. [Explanation of symbols]

[0170] 1 General housing 2 living room 2a living room 2b living room 2c living room 2d living room 3. Transport fan 3a Transport fan 3b Transport fan 3c Transport fan 3d conveyor fan 4. Fresh air intake fan 5. Exhaust Fan 5a Exhaust fan 5b Exhaust fan 5c Exhaust fan 5d Exhaust fan 6 Circulation Fan 6a Circulation fan 6b Circulation fan 6c Circulation fan 6d Circulation fan 9. Air Conditioner 10 System Controller 10A System Controller 11 Room temperature sensor 11a Room temperature sensor 11b Room temperature sensor 11c Room temperature sensor 11d Room temperature sensor 12 Room humidity sensor 12a Room humidity sensor 12b Room humidity sensor 12c Room Humidity Sensor 12d Room humidity sensor 14 Air conditioning room temperature sensor 15 Air conditioning room humidity sensor 16 Humidifier 17 Dehumidifier 18 Air conditioned room 19 Input / Output Terminal 20 Whole building air conditioning system 100 Mobile Devices 100a Mobile terminals 100b Mobile terminals 100c Mobile Device 101 Carbon dioxide measurement unit 101a Carbon dioxide measurement unit 101b Carbon dioxide measuring unit 101c Carbon dioxide measurement unit 200 Control section 200A Control Unit 210 Ventilation control unit 220 Ventilation Decision Unit 220A Ventilation Decision Unit 221 Concentration comparison section 221A Concentration comparison section 222 Threshold change unit 300 Concentration memory section 301 Carbon dioxide concentration table at the time of falling asleep 302 Terminal Information 303 Sleep onset concentration information 304 Carbon Dioxide Concentration Table at Sleep Onset 305 Terminal Information 306 Sleep onset concentration information 310 Concentration acquisition section 320 Sleep preparation detection unit 330 Vital Data Acquisition Unit 340 Sleep state determination unit 350 Judgment section 350A Judgment part 1001 Ventilation System 1002 Ventilation equipment 1003 Control Unit 1004 Carbon dioxide detector A User B User C User CO2a Carbon dioxide concentration CO2b Carbon dioxide concentration CO2c Carbon dioxide concentration

Claims

1. A ventilation device for ventilating a predetermined space; A carbon dioxide measuring unit for measuring a carbon dioxide concentration in the predetermined space; a sleep preparation detection unit that detects that a user in the predetermined space is in a sleep preparation state; A control unit that controls the ventilation by the ventilation device based on a detection result of the sleep preparation detection unit and the carbon dioxide concentration measured by the carbon dioxide measurement unit; A concentration storage unit stores a first threshold value indicating the carbon dioxide concentration suitable for falling asleep and a second threshold value higher than the first threshold value, The control unit is When the sleep preparation detection unit detects that the user is in a sleep preparation state, and when the carbon dioxide concentration measured by the carbon dioxide measurement unit is smaller than the second threshold value, control is performed to stop the ventilation by the ventilation device; Further, a concentration acquisition unit is provided for acquiring the carbon dioxide concentration measured by the carbon dioxide measurement unit, The concentration storage unit further stores sleep-onset concentration information indicating the carbon dioxide concentration at the time when the user falls asleep, The control unit is A ventilation system characterized by controlling the ventilation by the ventilation device when the sleep preparation detection unit detects the sleep preparation state so that the carbon dioxide concentration acquired by the concentration acquisition unit approaches the carbon dioxide concentration at the time of the user falling asleep, as indicated by the sleep-onset concentration information stored in the concentration memory unit.

2. The carbon dioxide measuring unit is The ventilation system according to claim 1, characterized in that it is provided in at least one of the ventilation device, lighting equipment, an operation switch of the ventilation device, an operation switch of the lighting equipment, a power outlet, a home appliance, and a mobile terminal carried by the user, which are provided in the specified space.

3. The concentration storage unit storing the sleep-onset concentration information and terminal information indicating a mobile terminal carried by the user in association with each other; The control unit is 2. The ventilation system according to claim 1, wherein the sleep-state concentration information stored in the concentration storage unit is the sleep-state concentration information corresponding to the terminal information.

4. The ventilation system further comprises: a determination unit that determines the number of the mobile terminals present in the specified space, The users are multiple, The concentration storage unit storing, for each of the plurality of users, the sleep-onset concentration information of the user and the terminal information of the user in association with each other; The control unit is The ventilation system described in claim 3, characterized in that when the sleep preparation detection unit detects that the user is in the sleep preparation state and the number of mobile devices determined by the judgment unit is multiple, the ventilation by the ventilation device is controlled so that the carbon dioxide concentration acquired by the concentration acquisition unit approaches the maximum or average carbon dioxide concentration at the time of sleep indicated by the sleep onset concentration information corresponding to each of the multiple terminal information indicating each of the multiple mobile devices determined by the judgment unit, which is stored in the concentration memory unit.

5. The control unit is The ventilation system according to any one of claims 1 to 4, characterized in that the first threshold value is changed based on the carbon dioxide concentration at the time of sleep onset indicated by the sleep onset concentration information stored in the concentration memory unit, and the ventilation by the ventilation device is controlled based on the changed first threshold value.

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