Air conditioner, target temperature determination method, computer program and storage medium

Abstract

To provide an air conditioner that determines an appropriate target temperature relative to a control space, a target temperature determination method, a computer program and a storage medium.SOLUTION: An air conditioner that determines an appropriate target temperature relative to a control space includes a communication section capable of communicating with a wearable device fitted to a user and a control section. The control section acquires heart rate information on a heart rate of the user and body temperature information on a body temperature of the user from the wearable device via the communication section, and determines the target temperature on the basis of the heart rate information and the body temperature information.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioner, a target temperature determination method, a computer program, and a storage medium. [Background technology]

[0002] Patent Document 1 discloses an air conditioner equipped with an infrared camera. The air conditioner uses the infrared camera to detect the position and biological temperature of a user, and controls the temperature of the air-conditioned space based on the detection results. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6509433 specification Summary of the Invention [Problem to be solved by the invention]

[0004] However, temperature control based on body temperature detected by an air conditioner leaves room for improvement in determining an appropriate target temperature for a controlled space that is the target of air conditioning control.

[0005] An object of the present disclosure is to provide an air conditioner, a target temperature determination method, a computer program, and a storage medium that determine an appropriate target temperature for a control space that is the target of air conditioning control. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present disclosure provides an air conditioner, a target temperature determination method, a computer program, and a storage medium.

[0007] An air conditioner according to one aspect of the present disclosure determines an appropriate target temperature for a controlled space. The air conditioner includes a communication unit capable of communicating with a wearable device worn by a user, and a control unit. The control unit acquires heart rate information related to the user's heart rate and body temperature information related to the user's body temperature from the wearable device via the communication unit, and determines the target temperature based on the heart rate information and body temperature information.

[0008] Another aspect of the present disclosure provides a target temperature determination method for determining an appropriate target temperature for a control space that is the target of air conditioning control by an air conditioner. The target temperature determination method includes the steps of acquiring heart rate information related to the user's heart rate and body temperature information related to the user's body temperature from a wearable device worn by the user, and determining a target temperature based on the heart rate information and the body temperature information.

[0009] Furthermore, a computer program according to another aspect of the present disclosure is a computer program for causing an air conditioner to execute the above-described target temperature determination method.

[0010] Another aspect of the present disclosure is a non-transitory computer-readable storage medium having a computer program stored therein, which, when executed by a processor, realizes the target temperature determination method described above. [Effects of the Invention]

[0011] According to the air conditioner, target temperature determination method, computer program, and storage medium disclosed herein, it is possible to determine an appropriate target temperature for a control space that is the target of air conditioning control. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a block diagram of an example of an air conditioner according to a first embodiment; [Figure 2] Flowchart of a target temperature determination method according to the first embodiment [Figure 3] Timing chart for cooling operation according to the first embodiment [Figure 4] Timing chart for heating operation according to the second embodiment [Figure 5] Timing chart for cooling operation according to the third embodiment [Figure 6] Timing chart for heating operation according to the third embodiment DETAILED DESCRIPTION OF THE INVENTION

[0013] 《Technical concept》 Before describing specific embodiments of the air conditioner, target temperature determination method, computer program, and storage medium according to the present disclosure, the technical concept described in the present disclosure will first be described using an example.

[0014] The air conditioner, target temperature determination method, computer program, and storage medium disclosed herein can determine a target temperature used for air conditioning control based on information acquired from a wearable device worn by a user. The air conditioner acquires heart rate information related to the user's heart rate and body temperature information related to the user's body temperature from the wearable device. The air conditioner then determines the target temperature based on the heart rate information and body temperature information. For example, if the user's heart rate and body temperature are stable, it can be assumed that the user is feeling comfortable, and the air conditioner maintains the current target temperature. On the other hand, if the user's heart rate is stable but their body temperature continues to drop, it can be assumed that the user is feeling cold, and the air conditioner raises the target temperature. In this way, a target temperature can be determined based on the heart rate information and body temperature information to increase room comfort.

[0015] Because the heart rate information and body temperature information are obtained from a wearable device attached to the user, accurate information can be obtained even if the user is in a position or state that makes it difficult for the air conditioner to detect the user's condition directly. Based on both the heart rate information and body temperature information, it is possible to determine the user's physical condition, such as whether they are feeling uncomfortable, or whether they are excited but uncomfortable with the room temperature, and to control the temperature according to their physical condition.

[0016] The air conditioner can also determine the target temperature using a timer that indicates the user's wake-up time. For example, in summer, if the room is cooled before the user's wake-up time, the user can wake up refreshed in a comfortable room temperature. The room temperature that a user finds comfortable may differ depending on the user. The air conditioner can learn the room temperature that a user finds comfortable based on the user's heart rate when they wake up. In this way, a more comfortable air-conditioned environment can be provided to the user.

[0017] Each of the embodiments described below represents an example of the present disclosure. The numerical values, shapes, configurations, steps, and step orders shown in each of the following embodiments are examples and do not limit the present disclosure. Among the components in the following embodiment 1, components that are not described in the independent claims that represent the highest concept are described as optional components.

[0018] In each of the embodiments described below, certain elements may be modified, and other elements may be appropriately combined with any configuration, and the combined configurations will provide the respective effects. In the embodiments, the respective combinations of the respective modified configurations will provide the respective effects of the respective modified configurations.

[0019] In the following detailed description, terms such as "first," "second," etc. are used for descriptive purposes only and should not be understood as expressing or implying the relative importance or ranking of technical features. Features qualified as "first" and "second" expressly or imply the inclusion of one or more of that feature.

[0020] First Embodiment Hereinafter, a first embodiment of an air conditioner, a target temperature determination method, a computer program, and a storage medium according to the present disclosure will be described in detail with appropriate reference to the drawings.

[0021] FIG. 1 is a block diagram of an example of an air conditioner according to Embodiment 1. The air conditioner 10 includes a communication unit 12, a storage unit 14, and a control unit 16. The air conditioner 10 is connectable to a wearable device 20 via the communication unit 12. The air conditioner 10 is further connectable to a server 30 connectable to the wearable device via the communication unit 12. For example, as described below, the air conditioner 10 may connect to a wearable device 20 such as a user's smartwatch via Bluetooth (registered trademark) or Wi-Fi (registered trademark). The air conditioner 10 may also connect to the server 30 via a network such as the Internet. The air conditioner 10 may also connect to a remote controller via infrared or the like. The air conditioner 10 may also connect directly or indirectly to an external information source 40 to acquire some of the information necessary for temperature control from the external information source 40.

[0022] Below, an overview of each component will be explained.

[0023] <Air conditioner 10> The air conditioner 10 has an indoor unit installed on a wall or ceiling of the controlled space, for example, the interior space of a room in a home or office, and an outdoor unit installed outdoors, such as in a central air-conditioning room other than the controlled space. The air conditioner 10 has, for example, a cooling function, a heating function, a deodorizing function, a dehumidifying function, a humidifying function, a ventilation function, and / or an air purifying function. These functions and operating modes can be freely combined (for example, a cooling and dehumidifying function, a heating and humidifying mode, a sleep mode, etc.).

[0024] <Communications Department 12> The communication unit 12 can also communicate with the user's wearable device 20 and the server 30 via a network, and can, for example, send and receive internet packets. As described above, the control unit 16 can cooperate with the wearable device 20 and / or the server 30 via the communication unit 12. The communication unit 12 can communicate and send and receive data between the air conditioner 10, the wearable device 20, and the server 30 in accordance with standards such as Wi-Fi (registered trademark), IEEE802.2, IEEE802.3, 3G, and LTE. The communication unit 12 can communicate via the internet, an intranet, an extranet, a LAN, ISDN, a VAN, a CATV communication network, a virtual private network, a telephone line network, a mobile communication network, a satellite communication network, infrared rays, or Bluetooth (registered trademark).

[0025] <Storage section 14> The storage unit 14 is a recording medium that records various information and control programs, and may be a memory that functions as a work area for the control unit 16. The storage unit 14 is realized, for example, by a flash memory, a RAM (Random Access Memory), a ROM (Read Only Memory), other storage devices, or an appropriate combination of these.

[0026] The memory unit 14 may store various thresholds and conditions for determining the target temperature. For example, the memory unit 14 may store at least one of the following: first through sixth body temperature thresholds, a first body temperature change threshold, a second body temperature change threshold, a first heart rate threshold, a second heart rate threshold, a first through sixth time periods, a first adjustment value, and a second adjustment value, as described below. The memory unit 14 may also store parameters for temperature control. For example, the memory unit 14 may store at least one of a specific control sequence, a target temperature under specific conditions, a time period for which the specific target temperature should be maintained, and a rate at which the target temperature is changed. The memory unit 14 may also store information obtained from the wearable device 20, the server 30, or an external information source 40. This information may be read by the control unit 16 when the target temperature is determined.

[0027] The storage unit 14 may also store a computer program for causing the control unit 16 to execute the target temperature determination method of the present disclosure. The storage unit 14 may be a non-transitory computer-readable storage medium in which the computer program is stored.

[0028] <Control unit 16> The control unit 16 is a controller that controls at least some of the functions of the air conditioner 10. The control unit 16 includes a general-purpose processor such as a CPU, MPU, MCU, FPGA, DSP, or ASIC that executes programs to achieve predetermined functions. The control unit 16 can implement various controls in the air conditioner 10 by calling and executing control programs stored in the storage unit 14. The control unit 16 can also work in cooperation with the storage unit 14 to read and write data stored in the storage unit 14. The control unit 16 is not limited to a unit that implements predetermined functions through cooperation between hardware and software, and may be a hardware circuit designed specifically to implement the predetermined functions.

[0029] The control unit 16 can communicate with the wearable device 20 via the communication unit 12. The control unit 16 can receive various commands and setting values ​​from the user (e.g., a command to start the cooling operation of the air conditioner 10, a command to set the temperature) from a remote controller via the communication unit 12. The control unit 16 can determine a target temperature based on these setting values ​​and information received from the wearable device 20. The control unit 16 can also control each component of the air conditioner 10 to perform the cooling function or heating function of the air conditioner 10 based on detection values ​​received from other sensors (e.g., whether or not a user is present in the controlled space, the indoor temperature, the outdoor temperature), etc.

[0030] The air conditioner 10 may further include sensors for acquiring various information from outside the air conditioner 10 in order to perform its functions. However, the air conditioner 10 and the target temperature determination method disclosed herein can be implemented even if there are no sensors attached to the air conditioner 10.

[0031] <Wearable Device 20> The wearable device 20 is a device that can be attached or worn on the user's body, and is also called a wearable device or a wearable terminal. The wearable device 20 may be in the form of a watch, wristband, glasses, ring, earphone, pocket, pendant, clothing, or shoe. That is, the wearable device 20 can be attached to a part of the user's limbs or body. For example, the wearable device 20 may be a smart watch, an activity meter, or a wearable sensor worn by the user.

[0032] The wearable device 20 acquires heart rate information related to the user's heart rate and body temperature information related to the user's body temperature, and transmits them to the air conditioner 10. In the embodiment of FIG. 1, the wearable device 20 includes a communication unit 22, a heart rate sensor 24, and a body temperature sensor 26.

[0033] The communication unit 22 can also communicate with the air conditioner 10 and the server 30 via a network. For example, the communication unit 22 communicates using at least one of Wi-Fi (registered trademark), IEEE802.2, IEEE802.3, 3G, LTE, an intranet, an extranet, a LAN, ISDN, VAN, a CATV communication network, a virtual private network, a telephone line network, a mobile communication network, a satellite communication network, infrared light, and Bluetooth (registered trademark). The wearable device 20 transmits the heart rate information and body temperature information directly to the air conditioner 10, or indirectly to the air conditioner 10 via the server 30 or another device.

[0034] The heart rate sensor 24 detects parameters related to the user's heart rate, and among the detected parameters, at least those related to the heart rate are regarded as heart rate information. For example, the heart rate information may include not only the user's heart rate, but also a heart rate waveform, heart rate variability, or heartbeat interval. In this disclosure, the unit of heart rate is beats per minute (BPM).

[0035] The body temperature sensor 26 detects the user's body temperature. In this disclosure, body temperature is detected from the area where the wearable device 20 is worn or a nearby area, for example, the temperature detected from the skin of the user's hand or foot. If the wearable device 20 is a smartwatch, the body temperature is detected from the user's wrist. If the wearable device 20 is an earphone type, the body temperature is detected from the user's inner ear. Below, the determination of the target temperature will be explained using an example in which the body temperature is detected from the skin of the user's hand or foot. Note that in this disclosure, the unit of body temperature is °C.

[0036] In one embodiment, the air conditioner 10 is connected to two wearable devices 20, each of which includes a heart rate sensor 24 and a body temperature sensor 26. In one embodiment, the wearable device 20 includes one of the heart rate sensor 24 and the body temperature sensor 26 and receives information from another device, including the other, and forwards it to the air conditioner 10. For example, the wearable device 20 includes the body temperature sensor 26 and generates body temperature information, while receiving heart rate information from another device. In this case, the wearable device 20 transmits both the generated body temperature information and the received heart rate information to the air conditioner 10.

[0037] <Server 30> The server 30 may be a server for managing at least one air conditioner 10 or at least one wearable device 20. Alternatively, the server 30 may be a management server or application server of a manufacturer of the air conditioner 10 or the wearable device 20 for collecting data. The server 30 can transfer the heart rate information and body temperature information received from the wearable device 20 to the air conditioner 10. In addition, for air conditioning control of the air conditioner 10, the server 30 can receive past, present, or future weather information from an external information source 40 and transfer it to the air conditioner 10.

[0038] <External information source 40> The external information source 40 is an information source that provides external information, such as weather information or information about the air quality of a specific region. For example, the external information source 40 may be the website of the Japan Meteorological Agency. The air conditioner 10 may be directly connected to the external information source 40 and acquire some of the information necessary for air conditioning control from the external information source 40, or may be indirectly connected to the external information source 40 via the server 30 or the wearable device 20 to acquire the necessary information.

[0039] <Target temperature determination method> 1, the target temperature determination method is executed by the air conditioner 10. In one embodiment, the air conditioner 10 executes the target temperature determination method periodically during operation, for example, every five minutes. Furthermore, the air conditioner 10 may execute the target temperature determination method when changing operation modes in response to a received command or in automatic operation.

[0040] 2 is a flowchart of a target temperature determination method according to the first embodiment, and the fluid analysis method includes steps S100 and S200. First, the control unit 16 of the air conditioner 10 acquires heart rate information related to the user's heart rate and body temperature information related to the user's body temperature from a wearable device worn by the user (step S100). Next, the control unit 16 determines the target temperature based on the heart rate information and body temperature information (step S200). After determining the target temperature, the control unit 16 controls at least one of the rotation speed and blown air speed of the compressor of the air conditioner 10 so that the room temperature reaches the target temperature.

[0041] In step S200, the control unit 16 determines whether the user's heart rate is stable based on the heart rate information. In one embodiment, when the heart rate is higher than a first heart rate threshold, the control unit 16 determines that the heart rate is unstable. Conversely, when the heart rate is equal to or lower than the first heart rate threshold, the control unit 16 determines that the heart rate is unstable. In one embodiment, when the change in the heart rate is higher than a second heart rate threshold, the control unit 16 determines that the heart rate is unstable. Conversely, when the change in the heart rate is equal to or lower than the second heart rate threshold, the control unit 16 determines that the heart rate is stable. In one embodiment, when the heart rate is higher than the first heart rate threshold or the change in the heart rate is higher than the second heart rate threshold, the control unit 16 determines that the heart rate is unstable. Conversely, when the heart rate is equal to or lower than the first heart rate threshold and the change in the heart rate is equal to or lower than the second heart rate threshold, the control unit 16 determines that the heart rate is stable.

[0042] The first and second heart rate thresholds can be set based on the average human heart rate. For example, it is said that the normal heart rate for Japanese men is 60 to 80 beats / minute, and the normal heart rate for Japanese women is 65 to 85 beats / minute. Based on the above values, the first heart rate threshold can be set within a range of 65 to 75 beats / minute. In one example, the first heart rate threshold is set to 75 beats / minute, and the second heart rate threshold is set to 5 beats / minute.

[0043] The second heart rate threshold can be set independently of the first heart rate threshold. Furthermore, since the stable heart rate varies among individuals depending on factors such as the user's age, physique, exercise habits, and health condition, the first heart rate threshold and the second heart rate threshold can be set to suit at least one specific user.

[0044] In one example, the first heart rate threshold and the second heart rate threshold are defined as heart rates when the air conditioner is operating stably and the user's heart rate is stable. In another example, the first heart rate threshold and the second heart rate threshold are defined as heart rates when the user's heart rate is stable regardless of the operation of the air conditioner.

[0045] In step S200, the control unit 16 can determine whether the user's body temperature is higher than a certain body temperature threshold or whether the body temperature is stable based on the body temperature information. The control unit 16 may further determine whether the body temperature is rising or falling.

[0046] Based on both the heart rate information and the body temperature information, the control unit 16 can determine the user's physical condition, such as whether the user is not feeling comfortable, or whether the user is excited but uncomfortable with the room temperature, and can control the temperature depending on the condition. In other words, the control unit 16 can determine an appropriate target temperature for the combination of the above-mentioned heart rate and body temperature conditions (i.e., various physical conditions), and increase the comfort in the controlled space.

[0047] Hereinafter, how the control unit 16 determines the target temperature for various physical conditions of the user in step S200 will be described.

[0048] Fig. 3 is a timing chart of the cooling operation according to embodiment 1. Fig. 3 shows some general situations when the cooling operation is being performed, for example, from period A1 to period E1.

[0049] <Period A1> In FIG. 3, period A1 refers to the period from time t1 to time t2. In FIG. 3, in region a1, the user's heart rate is determined to be unstable because the user's heart rate is higher than the first heart rate threshold (ht1) or the change in heart rate is higher than the second heart rate threshold. At the start of period A1 (time t1), the heart rate is unstable and the body temperature is higher than the first body temperature threshold tt1. The body temperature drops throughout period A1. Time t1 corresponds, for example, to when a user returns home in summer or when going to bed in summer. At this time, the heart rate is unstable and the body temperature is high due to the hot outside air or activity. In this situation, providing a relatively low room temperature environment would make the user feel comfortable, and the heart rate would calm down in a low room temperature environment. Therefore, the air conditioner 10 determines the target temperature so as to lower the room temperature relatively quickly over period A1.

[0050] In the example of FIG. 3, region a1 indicates a region where the user's heart rate is unstable. For example, if the first heart rate threshold ht1 is 70 beats / min and the second heart rate threshold is 5 beats / min, the user's heart rate is detected to be higher than 70 beats / min or the change in heart rate is detected to be higher than 5 beats / min in region a1. Suppose the user's heart rate is detected to be 85 beats / min via the wearable device 20. Because the user's heart rate is higher than the first heart rate threshold, the control unit 16 determines that the user's heart rate is unstable and corresponds to period A1. In this case, the control unit 16 determines the target temperature so as to lower the room temperature relatively quickly.

[0051] In one embodiment, the control unit 16 determines the target temperature and the rate at which the target temperature is changed based on the difference between the detected user's heart rate and the first heart rate threshold. For example, if the user's heart rate is detected to be 85 beats per minute during cooling operation, the difference from the first heart rate threshold (70 beats per minute) is 15 beats per minute, and the control unit 16 may determine the target temperature so that the user's heart rate decreases by 15 beats per minute.

[0052] During cooling operation, if the control unit 16 determines that the user's heart rate is unstable based on the heart rate information and that the body temperature is higher than the first body temperature threshold based on the body temperature information, the control unit 16 lowers the target temperature. For example, over a period A1, the control unit 16 significantly lowers the target temperature at a relatively fast rate of change (rate of reduction). That is, the control unit 16 lowers the target temperature so that the amount of change per unit time is relatively large. In the present disclosure, when lowering or raising the target temperature over a certain period, the target temperature may be changed continuously or in stages.

[0053] When the target temperature is controlled in this manner, the user's heart rate has not yet stabilized over the period A1, but the body temperature decreases as the target temperature and room temperature decrease.

[0054] In one embodiment, when the air conditioner 10 is started and begins cooling operation, it is assumed by default that the time is in period A1, and the control unit 16 lowers the target temperature at a relatively fast rate of change.

[0055] <Period B1> 3, period B1 refers to the period from time t2 to time t3. During period A1, the target temperature and room temperature drop significantly, and then during period B1, the user's heart rate gradually stabilizes. If the room temperature drops too much, the user may feel cold, so the air conditioner 10 maintains the target temperature at the same temperature throughout period B1 without lowering it.

[0056] In one embodiment, during cooling operation, if the controller 16 determines that the body temperature has fallen below the second body temperature threshold after lowering the target temperature, the controller 16 maintains the target temperature. The second body temperature threshold is lower than the first body temperature threshold. That is, when the body temperature has fallen to a certain level and fallen below the second body temperature threshold (time t2), the controller 16 transitions from period A1 to period B1 (time t2) and maintains the target temperature at the current value. By controlling the target temperature in this manner, it is confirmed that the user's heart rate is gradually stabilizing during period B1.

[0057] In one embodiment, the condition for transitioning from period A1 to period B1 is not that the body temperature has fallen below the second body temperature threshold, but that a predetermined time has elapsed since time t1. In this case, control unit 16 may learn the length of period A1. For example, if the heart rate has not stabilized even after a predetermined time has elapsed since time t2, control unit 16 extends the predetermined time that serves as a transition condition for transitioning to period B1.

[0058] In one embodiment, the control unit 16 learns the rate of change (rate of decrease) of the target temperature during the period A1. For example, if the heart rate has not stabilized after a predetermined time has elapsed since time t2, the control unit 16 increases the rate of decrease of the target temperature, i.e., increases the amount of decrease of the target temperature per unit time.

[0059] The length of the period A1 and the rate at which the target temperature is lowered during the period A1 are set to a degree that does not put strain on the body.

[0060] <Period C1> In FIG. 3, period C1 refers to the period from time t3 to time t5. During periods A1 and B1, the room temperature and body temperature continue to decrease, and the user's heart rate gradually stabilizes. As the body temperature continues to decrease, during period C1, the control unit 16 slightly increases the target temperature in anticipation of an overshoot. In this disclosure, an overshoot refers to the user's body temperature dropping too low during cooling operation or rising too high during heating operation. For example, the memory unit 14 of the air conditioner 10 stores a comfortable body temperature range related to the body temperature at which the user feels comfortable. If the user's body temperature exceeds or falls below the comfortable body temperature range, an overshoot is determined to have occurred. Note that different comfortable body temperature ranges can be set for cooling operation and heating operation. The comfortable body temperature range for cooling operation is indicated by area a2 in FIG. 3.

[0061] When the control unit 16 determines that the user's heart rate is stable and that the body temperature is equal to or lower than the third body temperature threshold during cooling operation, the control unit 16 transitions to period C1 and raises the target temperature. The third body temperature threshold is set to prevent the body temperature from overshooting during cooling operation and is lower than the second body temperature threshold.

[0062] In one embodiment, the period C1 is divided into an early period (from time t3 to time t4) and a later period (from time t4 to time t5). The control unit 16 raises the target temperature at different rates of change (raising speed) in the early and later periods of the period C1. More specifically, the control unit 16 determines that the period C1 is entering the later period when it determines that the amount of change in body temperature is equal to or less than the first body temperature change threshold (time t4), i.e., when it determines that the user's body temperature has stopped decreasing (time t4). The control unit 16 raises the target temperature at a relatively high rate in the early period of the period C1 and at a relatively low rate in the later period C1. That is, during cooling operation, if the control unit 16 determines that the amount of change in body temperature is equal to or less than the first body temperature change threshold after the body temperature has become equal to or less than the third body temperature threshold, it reduces the rate at which the target temperature is raised.

[0063] When the target temperature is controlled in this way, the user's heart rate remains stable during period C1, and the body temperature drops for a while before gradually rising. During period C1, the body temperature rises, enters the comfortable body temperature range, and is gradually stabilizing.

[0064] <Period D1> 3, period D1 refers to the period from time t5 to time t6. During period C1, the room temperature and body temperature rise, the body temperature falls within the comfortable body temperature range, and the user's heart rate remains stable. In order to stabilize the body temperature within the comfortable body temperature range, during period D1, controller 16 slightly lowers the target temperature.

[0065] In one embodiment, the control unit 16 transitions to period D1 when the first hour ends (time t5) after the later period C1 begins (time t4). The first hour refers to the later period of period C1, i.e., the period from time t4 to time t5. During period D1, the control unit 16 controls the target temperature so as to maintain the user's body temperature within the comfortable body temperature range. That is, during cooling operation, the control unit 16 reduces the rate at which the target temperature is increased and then, after the first hour has elapsed (time t5), lowers the target temperature so as not to exceed the comfortable body temperature range.

[0066] The control unit 16 can acquire the comfortable body temperature range by reading it from the memory unit 14. Alternatively, the control unit 16 can acquire the comfortable body temperature range by calculating it based on at least one of the current date and time, humidity in the controlled space, the amount of clothing worn by the user, the amount of activity of the user, the amount of heat generated by the user, and the weight of the user.

[0067] In one embodiment, during period D1, control unit 16 gradually lowers the target temperature to promote stabilization of the user's body temperature. For example, during period D1, the target temperature may be lowered at a slower rate than during period A1.

[0068] The control unit 16 may learn the length of the first time period. For example, if the control unit 16 determines that the body temperature has exceeded the comfortable body temperature range for a period D1, the control unit 16 decreases the first time period. Alternatively, if the control unit 16 determines that the body temperature exceeded the comfortable body temperature range at the end of a predetermined period from time t4 that is longer than the first time period, the control unit 16 decreases the first time period. On the other hand, if the control unit 16 determines that the body temperature is still below the comfortable body temperature range at the end of the first time period from time t4, the control unit 16 increases the first time period.

[0069] In one embodiment, the initial value of the first time period is set based on the weight and heat output of the user, or based on the average weight and heat output of a human being.

[0070] In one embodiment, the condition for transitioning from period C1 to period D1 is not that a first time has elapsed since time t4, but that the body temperature has risen above a predetermined threshold. The predetermined threshold may be, for example, the lower limit of the comfortable body temperature range, or a value slightly higher than the lower limit of the comfortable body temperature range. This transition condition allows the target temperature to be lowered only after the body temperature has recovered to a certain level.

[0071] In one embodiment, a comfortable room temperature range related to the room temperature at which the user feels comfortable is stored in the memory unit 14 of the air conditioner 10. The condition for transitioning from period C1 to period D1 is when the room temperature becomes higher than the upper limit of the comfortable room temperature range. Different comfortable room temperature ranges can be set for cooling operation and heating operation, and the comfortable room temperature range for cooling operation is shown by area a3 in Figure 3. This transition condition makes it possible to prevent the room temperature from rising too high.

[0072] By controlling the target temperature in this manner, the user's heart rate remains stable during period D1, and the body temperature rises for a while and then gradually decreases. During period D1, the body temperature is becoming stable within the comfortable body temperature range.

[0073] <Period E1> In Figure 3, period E1 refers to the period from time t6 to time t7. During period D1, the user's heart rate remains stable and the body temperature is maintained within the comfortable body temperature range. When both the user's heart rate and body temperature become stable, it can be assumed that the user feels comfortable with the current target temperature, and so the control unit 16 maintains the target temperature. In other words, when the control unit 16 determines that the user's heart rate is stable and that the body temperature is stable, it maintains the target temperature.

[0074] Thereafter, if the user's heart rate or body temperature becomes unstable due to exercise or solar radiation, the control unit 16 can set the target temperature based on the state of the heart rate and body temperature, as described for periods A1 to E1. For example, if the user's heart rate is stable and the body temperature is dropping during cooling operation, the control unit 16 may perform the same control as in periods A1 and B1. Also, if the user's heart rate is stable and the body temperature is dropping during cooling operation, the control unit 16 may perform the same control as in periods C1 and D1.

[0075] In one embodiment, the control unit 16 repeatedly executes the temperature control performed in at least one of the periods A1 to E1. For example, the temperature control may be repeated in the periods A1 to E1 and A1 to E1, or may be repeated in the periods A1 to E1 and C1 to E1. In one embodiment, the control unit 16 may omit the temperature control performed in at least one of the periods A1 to E1. For example, the temperature control may be executed in the order of the periods A1, B1, and E1.

[0076] <Control over other states> There are combinations of the user's heart rate and body temperature states that are different from those at the start of the periods A1 to E1 described above. Below, we will explain using several examples how the control unit 16 determines the target temperature for other states.

[0077] In one embodiment, if the control unit 16 determines that the user's heart rate is unstable but the body temperature is stable, the control unit 16 maintains the target temperature. Here, the control unit 16 may monitor how long the unstable heart rate continues. If the body temperature is stable but the heart rate increases (i.e., becomes unstable) within a short period of time, it can be assumed that this is not a reaction to heat or cold, but rather a temporary reaction to a situation such as the user watching a horror movie. In this case, the control unit 16 maintains the target temperature for a certain period of time. If the user's heart rate returns to a stable state after the certain period of time has passed, the control unit 16 continues to maintain the target temperature. On the other hand, if the heart rate remains unstable even after the certain period of time has passed, or if the body temperature rises during the certain period of time, the control unit 16 performs the same control as in periods A1 and B1.

[0078] Furthermore, if the user's heart rate is unstable and the body temperature drops during the above-mentioned certain period of time, the control unit 16 may maintain the target temperature or may increase the target temperature. For example, the control unit 16 may determine the target temperature as follows: If the heart rate is unstable and the body temperature drops below a specific threshold, the control unit 16 increases the target temperature. If the heart rate is unstable and the body temperature drops more than a predetermined number of times, the control unit 16 increases the target temperature. If the heart rate is unstable and the body temperature does not drop below the specific threshold, the control unit 16 maintains the target temperature.

[0079] In one embodiment, when the user's heart rate is higher than a first heart rate threshold (ht1) and the change in heart rate is equal to or less than a second heart rate threshold (ht2), the control unit 16 lowers the target temperature. If the heart rate remains high, it can be assumed that the user is exercising or doing housework. In this case, the body temperature is likely to be high, so the control unit 16 may lower the target temperature and then maintain it low.

[0080] In one embodiment, when the user's body temperature suddenly or temporarily rises, the control unit 16 determines the target temperature so that the room temperature will fall. For example, a seventh body temperature threshold, e.g., 37.5°C, higher than the first body temperature threshold is stored in the memory unit 14. When the control unit 16 determines that the user's body temperature has risen above the seventh body temperature threshold, it determines that period A1 has started regardless of the stability of the user's heart rate.

[0081] This completes the target temperature determination process for the air conditioner 10. After determining the target temperature, the control unit 16 controls at least one of the rotation speed of the compressor and the blown air speed of the air conditioner 10 so that the room temperature becomes the target temperature.

[0082] According to the target temperature determination method and air conditioner 10 described above, the target temperature can be determined based on the user's heart rate information and body temperature information, thereby increasing comfort within the controlled space. Because the heart rate information and body temperature information are obtained from a wearable device worn by the user, accurate information can be obtained even if the user is in a position or state that makes it difficult for the air conditioner to detect them directly. Furthermore, the air conditioner 10 can learn the length of period A1, the rate at which the target temperature is lowered during period A1, the length of the first time, and the like. Through this learning, comfort within the controlled space can be further increased for a specific user.

[0083] In one embodiment, the air conditioner 10 includes a program used to execute the target temperature determination method as described above. The program causes the control unit 16 of the air conditioner 10 to execute the target temperature determination method.

[0084] In one embodiment, the air conditioner 10 has a non-transitory computer-readable storage medium on which a computer program is stored. The control method of the present disclosure is realized when the computer program is executed by the processor (control unit 16). The storage medium may be the same as the storage unit 14 of the air conditioner 10, may be included in the storage unit 14, or may be a component separate from the storage unit 14.

[0085] Second Embodiment <Control during heating operation> In the second embodiment, the air conditioner 10 and the target temperature determination method can determine the target temperature based on heart rate information and body temperature information even during heating operation.

[0086] The control unit 16 of the air conditioner 10 determines the target temperature during heating operation by executing steps S100 and S200 shown in Fig. 2. Fig. 4 is a timing chart for heating operation according to embodiment 2. Fig. 4 shows several general situations when heating operation is being performed, for example, from period A2 to period E2.

[0087] <Period A2> In FIG. 4, period A2 refers to the period from time t8 to time t9. In FIG. 4, in region a4, the user's heart rate is determined to be unstable because the user's heart rate is higher than the first heart rate threshold (ht1) or the change in heart rate is higher than the second heart rate threshold. At the start of period A2 (time t8), the heart rate is unstable and the body temperature is equal to or lower than the fourth body temperature threshold tt4, and the body temperature rises throughout period A2. Time t8 corresponds, for example, to when a user returns home in winter or when going to bed in winter. At this time, the heart rate is unstable and the body temperature is low due to cold outside air or activity. In this situation, providing a relatively warm room temperature environment would make the user feel comfortable, and the warm environment would calm the user's heart rate. Therefore, the air conditioner 10 determines the target temperature so as to raise the room temperature relatively quickly over period A2.

[0088] During heating operation, if the control unit 16 determines that the user's heart rate is unstable based on the heart rate information and that the body temperature is equal to or lower than the fourth body temperature threshold based on the body temperature information, the control unit 16 increases the target temperature. For example, over period A2, the control unit 16 significantly increases the target temperature at a relatively fast rate of change (rate of increase). That is, the control unit 16 increases the target temperature so that the amount of change per unit time is relatively large.

[0089] When the target temperature is controlled in this manner, the user's heart rate has not yet stabilized over the period A2, but the body temperature rises as the target temperature and room temperature rise.

[0090] In one embodiment, when the air conditioner 10 is started and starts heating operation, it is assumed by default that the time is in period A2, and the control unit 16 increases the target temperature at a relatively fast rate of change.

[0091] <Period B2> 4, period B2 refers to the period from time t9 to time t10. During period A2, the target temperature and room temperature rise significantly, and then during the subsequent period B2, the user's heart rate gradually stabilizes. If the room temperature rises too much, the user may feel too hot, so the air conditioner 10 maintains the target temperature at the same temperature throughout period B2 without raising it.

[0092] In one embodiment, during heating operation, if the control unit 16 determines that the body temperature has risen above a fifth body temperature threshold after increasing the target temperature, the control unit 16 maintains the target temperature. The fifth body temperature threshold is higher than the fourth body temperature threshold. That is, when the body temperature has risen to a certain level and is higher than the fifth body temperature threshold (time t9), the control unit 16 transitions from period A2 to period B2 (time t9) and maintains the target temperature at the current value. By controlling the target temperature in this manner, it is confirmed that the user's heart rate is gradually stabilizing during period B2.

[0093] In one embodiment, the condition for transitioning from period A2 to period B2 is not that the body temperature has risen above the fifth body temperature threshold, but that a predetermined time has elapsed since time t8. In this case, control unit 16 may learn the length of period A2. For example, if the heart rate has not stabilized even after a predetermined time has elapsed since time t9, control unit 16 extends the predetermined time that serves as a transition condition for transitioning to period B2.

[0094] In one embodiment, the control unit 16 learns the rate of change (rate of increase) of the target temperature during the period A2. For example, if the heart rate has not stabilized after a predetermined time has elapsed since time t9, the control unit 16 increases the rate of increase of the target temperature, i.e., increases the amount of increase of the target temperature per unit time.

[0095] The length of the period A2 and the rate at which the target temperature is increased during the period A2 are set to a degree that does not place a burden on the body.

[0096] <Period C2> In Figure 4, period C2 refers to the period from time t10 to time t12. During periods A2 and B2, the room temperature and body temperature continue to rise, and the user's heart rate gradually stabilizes. Because the body temperature continues to rise, during period C2, the control unit 16 slightly lowers the target temperature in anticipation of an overshoot. The memory unit 14 of the air conditioner 10 can store a comfortable body temperature range for heating operation, and this comfortable body temperature range for heating operation is indicated by area a5 in Figure 4.

[0097] During heating operation, if the control unit 16 determines that the user's heart rate is stable and that the body temperature is higher than the sixth body temperature threshold, the control unit 16 transitions to period C2 and lowers the target temperature. The sixth body temperature threshold is set to prevent the body temperature from overshooting during heating operation and is higher than the fifth body temperature threshold.

[0098] In one embodiment, the period C2 is divided into an early period (from time t10 to time t11) and a later period (from time t11 to time t12). The control unit 16 lowers the target temperature at different change rates (lowering rates) in the early and later periods of the period C2. More specifically, the control unit 16 determines that the later period C2 has begun when it determines that the amount of change in body temperature is equal to or less than the second body temperature change threshold (time t11), i.e., when it determines that the user's body temperature has stopped rising (time t11). The control unit 16 lowers the target temperature at a relatively high rate in the early period of the period C2 and at a relatively low rate in the later period C2. That is, during heating operation, if the control unit 16 determines that the amount of change in body temperature is equal to or less than the second body temperature change threshold after the body temperature has risen above the sixth body temperature threshold, it reduces the rate at which the target temperature is lowered.

[0099] By controlling the target temperature in this way, the user's heart rate remains stable during period C2, and the body temperature rises for a while before gradually decreasing. During period C2, the body temperature decreases, falls into the comfortable body temperature range, and becomes stable.

[0100] <Period D2> In Figure 4, period D2 refers to the period from time t12 to time t13. During period D2, the room temperature and body temperature drop, the body temperature falls into the comfortable body temperature range, and the user's heart rate remains stable. In order to stabilize the body temperature within the comfortable body temperature range, the control unit 16 slightly increases the target temperature during period D2.

[0101] In one embodiment, the control unit 16 transitions to period D2 when the second time period ends (time t12) after the later period C2 begins (time t11). The second time period refers to the later period of period C2, i.e., the period from time t11 to time t12. During period D2, the control unit 16 controls the target temperature so as to maintain the user's body temperature within the comfortable body temperature range. That is, during heating operation, the control unit 16 reduces the rate at which the target temperature is lowered, and then after the second time period has elapsed (time t12), raises the target temperature so as not to exceed the comfortable body temperature range.

[0102] In one embodiment, during period D2, control unit 16 gradually increases the target temperature to promote stabilization of the user's body temperature. For example, during period D2, the target temperature may be increased at a slower rate than during period A2.

[0103] The control unit 16 may learn the length of the second time period. For example, if the control unit 16 determines that the body temperature has been below the comfortable body temperature range for a period D2, the control unit 16 decreases the second time period. Alternatively, if the control unit 16 determines that the body temperature has fallen below the comfortable body temperature range at the end of a predetermined period from time t11 that is longer than the second time period, the control unit 16 decreases the second time period. On the other hand, if the control unit 16 determines that the body temperature is still above the comfortable body temperature range at the end of the second time period from time t11, the control unit 16 increases the second time period.

[0104] In one embodiment, the initial value of the second time period is set based on the weight and heat generation of the user, or based on the average weight and heat generation of a human being.

[0105] In one embodiment, the condition for transitioning from period C2 to period D2 is not that the second time has elapsed since time t11, but that the body temperature has fallen below a predetermined threshold. The predetermined threshold may be, for example, the upper limit of the comfortable body temperature range, or a value slightly lower than the upper limit of the comfortable body temperature range. This transition condition allows the target temperature to be raised after the body temperature has recovered to a certain low level.

[0106] In one embodiment, the condition for transitioning from period C2 to period D2 is that the room temperature falls below the lower limit of the comfortable room temperature range. The comfortable room temperature range for heating operation is shown by area a6 in Figure 4. This transition condition prevents the room temperature from dropping too low.

[0107] By controlling the target temperature in this manner, the user's heart rate remains stable during period D2, and the body temperature drops for a while before gradually rising. During period D2, the body temperature is becoming stable within the comfortable body temperature range.

[0108] <Period E2> In Figure 4, period E2 refers to the period from time t13 to time t14. During period E2, the user's heart rate remains stable and the body temperature is maintained within the comfortable body temperature range. When both the user's heart rate and body temperature become stable, it can be assumed that the user feels comfortable with the current target temperature, and therefore control unit 16 maintains the target temperature. In other words, when control unit 16 determines that the user's heart rate is stable and that the body temperature is stable, it maintains the target temperature.

[0109] Thereafter, if the user's heart rate or body temperature becomes unstable due to exercise or solar radiation, the control unit 16 can set the target temperature based on the state of the heart rate and body temperature, as described for periods A2 to E2. For example, during heating operation, if the user's heart rate is stable and the body temperature is rising, the control unit 16 may perform the same control as in periods A2 and B2. Furthermore, during heating operation, if the user's heart rate is stable and the body temperature is rising, the control unit 16 may perform the same control as in periods C2 and D2.

[0110] In one embodiment, the control unit 16 repeatedly executes the temperature control performed in at least one of the periods A2 to E2. For example, the temperature control may be repeated in the periods A2 to E2 and A2 to E2, or may be repeated in the periods A2 to E2 and C2 to E2. In one embodiment, the control unit 16 may omit the temperature control performed in at least one of the periods A2 to E2. For example, the temperature control may be executed in the order of the periods A2, B2, and E2.

[0111] The combination of the user's heart rate and body temperature state may differ from that at the start of the above-described periods A2 to E2. Regarding control for other states, the control unit 16 may determine the target temperature as described above even in the heating operation.

[0112] This completes the process of determining the target temperature in heating operation of the air conditioner 10. After determining the target temperature, the control unit 16 controls at least one of the rotation speed of the compressor and the blown air speed of the air conditioner 10 so that the room temperature becomes the target temperature.

[0113] According to the target temperature determination method and air conditioner 10 described above, even during heating operation, the target temperature can be determined based on the user's heart rate information and body temperature information, thereby increasing comfort within the controlled space. The air conditioner 10 can also learn the length of period A2, the rate at which the target temperature is lowered during period A2, the length of the second time, etc. This learning can further increase comfort within the controlled space.

[0114] Third Embodiment <Temperature control when waking up> In the third embodiment, the air conditioner 10 controls the temperature by further utilizing a timer that indicates the user's wake-up time. For example, the air conditioner 10 can lower the target temperature in summer before the timer set time arrives, and can raise the target temperature in winter before the timer set time arrives.

[0115] Fig. 5 is a timing chart of the cooling operation according to embodiment 3. Fig. 5 shows a general situation in which the cooling operation is being performed and which occurs before and after the set time, for example, periods E3 and F.

[0116] <Period E3> 5, period E3 refers to the period from time t15 to time t16. Because the user is still asleep before the timer is set, their heart rate and body temperature are stable. During period E3, control unit 16 of air conditioner 10 maintains the target temperature.

[0117] <Period F> In FIG. 5, period F refers to the period from time t16 to time t20. Time t18 is the timer setting that indicates the user's wake-up time. In summer, if temperature control is not performed at wake-up time, when the user wakes up, their body temperature rises suddenly, their heart rate becomes high and unstable, and they feel uncomfortable. On the other hand, if the room is cooled before the user's wake-up time, the user can wake up refreshed in a comfortable room temperature.

[0118] Therefore, in cooling operation, the control unit 16 gradually lowers the target temperature around the timer's set time (time t18). More specifically, in cooling operation, the control unit 16 lowers the target temperature over a period from three hours before the set time (time t18) (time t17) to four hours after the set time (time t18) (time t19). Furthermore, after four hours have passed since the set time (time t19), the control unit 16 may maintain the target temperature.

[0119] The third time period mentioned above refers to the period from time t17 to time t18, and the fourth time period refers to the period from time t18 to time t19. The third time period may be, for example, 10 minutes, 15 minutes, 30 minutes, 45 minutes, or 60 minutes. The fourth time period may be the same as or different from the third time period. The fourth time period may be, for example, 10 minutes, 15 minutes, 30 minutes, 45 minutes, or 60 minutes.

[0120] 5, at time t16, the period E3 transitions to period F. From time t16 to time t17, the control unit 16 may maintain the target temperature or may prepare for control to lower the target temperature.

[0121] In another embodiment, time t16 and time t17 are the same. That is, period E3 refers to the period from time t15 to time t17, and period F refers to the period from time t17 to time t20. In this embodiment, control unit 16 does not change control at time t16.

[0122] In one example, the control unit 16 learns the target temperature when the fourth hour has passed since the set time (time t19) based on the user's heart rate when they wake up. In the third embodiment, a heart rate change criterion used as an index of comfort is stored in the memory unit 14 of the air conditioner 10. The control unit 16 learns the target temperature when the fourth hour has passed since the set time (time t19) based on the heart rate information and the heart rate change criterion. In this way, it is possible to learn a temperature that is comfortable for the user when they wake up, and to maintain a comfortable temperature from time t19 onwards.

[0123] For example, the heart rate change criterion is a threshold value for heart rate change. The control unit 16 calculates the amount of change in heart rate based on the heart rate information and determines whether the amount of change is higher than the heart rate change criterion. If the amount of change is higher than the heart rate change criterion, it can be inferred that the user's heart rate is unstable and the user is not feeling comfortable. Therefore, in cooling operation, if the amount of change is higher than the heart rate change criterion, the control unit 16 lowers the target temperature when four hours have passed since the set time (time t19) by the first adjustment value. On the other hand, in cooling operation, if the amount of change is equal to or less than the heart rate change criterion, the control unit 16 raises the target temperature when four hours have passed since the set time (time t19) by the second adjustment value.

[0124] In one embodiment, the control unit 16 learns the length of the third period (from time t17 to time t18) based on the user's heart rate when waking up. As the length of the third period increases, the target temperature and the room temperature decrease. Therefore, by controlling the length of the third period, a comfortable temperature can be provided to the user when waking up.

[0125] The control unit 16 uses the first adjustment value and the second adjustment value to gradually correct the target temperature at time t19. The first adjustment value and the second adjustment value may be the same or different, and may be set automatically by the control unit 16 or the server 30, or may be set by the user. The first adjustment value and the second adjustment value may be, for example, 0.2°C, 0.5°C, or 1°C.

[0126] For example, when the amount of change is higher than the heart rate change standard during cooling operation, the control unit 16 decreases the length of the third time period. On the other hand, when the amount of change is equal to or lower than the heart rate change standard during cooling operation, the control unit 16 increases the length of the third time period. The decrease and increase amounts of the third time period may be the same or different, and may be set automatically by the control unit 16 or the server 30 or by the user. The decrease and increase amounts of the third time period may be, for example, 3 minutes, 5 minutes, 10 minutes, 15 minutes, or 30 minutes.

[0127] This completes the temperature control process for waking up in cooling operation. The target temperature determination method and air conditioner 10 described above can provide a comfortable environment for the user when waking up in cooling operation. Furthermore, based on changes in the user's heart rate when waking up, it is possible to learn the target temperature for waking up or the time for which the target temperature should be lowered. This further enhances comfort when waking up.

[0128] Fig. 6 is a timing chart of the heating operation according to the third embodiment. Fig. 6 shows a general situation in which the heating operation is being performed and which occurs before and after the set time, for example, periods E3 and G. During period E3, the temperature may be controlled as described above for period E3.

[0129] <Period G> In FIG. 6, period G refers to the period from time t22 to time t26. Time t24 is the timer setting that indicates the user's wake-up time. In winter, if temperature control is not performed at wake-up time, when the user wakes up and gets out of bed, their body temperature drops suddenly, their heart rate becomes high and unstable, and they feel uncomfortable. On the other hand, if the room is heated before the user's wake-up time, the user can wake up feeling refreshed in a comfortable room temperature.

[0130] Therefore, in heating operation, control unit 16 gradually increases the target temperature around the timer's set time (time t24). More specifically, in heating operation, control unit 16 increases the target temperature over a period from five hours before the set time (time t24) (time t23) to six hours after the set time (time t24) (time t25). Furthermore, control unit 16 may maintain the target temperature after six hours have passed since the set time (time t25).

[0131] The fifth time period mentioned above refers to the period from time t23 to time t24, and the sixth time period refers to the period from time t24 to time t25. The fifth time period may be the same as or different from the third time period. The fifth time period may be, for example, 10 minutes, 15 minutes, 30 minutes, 45 minutes, or 60 minutes. The sixth time period may be the same as or different from the fifth time period and may be the same as or different from the fourth time period. The sixth time period may be, for example, 10 minutes, 15 minutes, 30 minutes, 45 minutes, or 60 minutes.

[0132] 6, at time t22, the period E3 transitions to period G. From time t22 to time t23, the control unit 16 may maintain the target temperature or may prepare for control to increase the target temperature.

[0133] In another embodiment, time t22 and time t23 are the same. That is, period E3 refers to the period from time t21 to time t23, and period G refers to the period from time t23 to time t26. In this embodiment, control unit 16 does not change control at time t22.

[0134] In one embodiment, the control unit 16 learns the target temperature when the sixth hour has passed since the set time (time t25) based on the user's heart rate when they wake up. The control unit 16 learns the target temperature when the sixth hour has passed since the set time (time t25) based on the heart rate information and the heart rate change criteria. In this way, it is possible to learn a temperature that is comfortable for the user when they wake up, and to maintain a comfortable temperature after time t25.

[0135] For example, in heating operation, if the amount of change is higher than the heart rate change standard, control unit 16 increases the target temperature when six hours have passed since the set time (time t25) by the third adjustment value. On the other hand, in heating operation, if the amount of change is equal to or smaller than the heart rate change standard, control unit 16 decreases the target temperature when six hours have passed since the set time (time t25) by the fourth adjustment value.

[0136] In one embodiment, the control unit 16 learns the length of the fifth period (from time t23 to time t24) based on the user's heart rate when waking up. As the length of the fifth period increases, the target temperature and the room temperature increase. Therefore, by controlling the length of the fifth period, a comfortable temperature can be provided to the user when waking up.

[0137] The control unit 16 uses the third adjustment value and the fourth adjustment value to gradually correct the target temperature at time t25. The third adjustment value and the fourth adjustment value may be the same numerical value or different numerical values, and may be set automatically by the control unit 16 or the server 30 or by the user. The third adjustment value may be the same numerical value as the first adjustment value or different numerical value. The fourth adjustment value may be the same numerical value as the second adjustment value or different numerical value. The third adjustment value and the fourth adjustment value may be, for example, 0.2°C, 0.5°C, or 1°C.

[0138] For example, during heating operation, if the amount of change is higher than the heart rate change standard, the control unit 16 decreases the length of the fifth time period. On the other hand, during heating operation, if the amount of change is equal to or lower than the heart rate change standard, the control unit 16 increases the length of the fifth time period. The decrease and increase amounts of the fifth time period may be the same or different, and may be set automatically by the control unit 16 or the server 30 or by the user. The decrease and increase amounts of the fifth time period may be the same or different from the decrease and increase amounts of the sixth time period. The decrease and increase amounts of the fifth time period may be, for example, 3 minutes, 5 minutes, 10 minutes, 15 minutes, or 30 minutes.

[0139] This completes the temperature control process for waking up in heating operation. According to the target temperature determination method and air conditioner 10 described above, a highly comfortable environment can be created for the user when waking up in heating operation. Furthermore, based on changes in the user's heart rate when waking up, it is possible to learn the target temperature for waking up or the time for which the target temperature should be raised. This further enhances comfort when waking up.

[0140] The initial values ​​of the third to sixth times mentioned above can be set based on the cooling / heating capacity of the air conditioner 10 and the size of the controlled space.

[0141] In one embodiment, a comfortable room temperature range for period E3, which is related to the room temperature at which the user feels comfortable, is stored in the memory unit 14 of the air conditioner 10. Furthermore, a comfortable room temperature range for summer and a comfortable room temperature range for winter can be stored in the memory unit 14. As an example, the comfortable room temperature range for summer is 25°C to 28°C, and the comfortable room temperature range for winter is 18°C ​​to 22°C. However, the comfortable room temperature ranges are not limited to these examples.

[0142] In one embodiment, because people tend to wake up more easily in a slightly cooler environment in the summer, when transitioning from period E3 to period F in Fig. 5, control unit 16 intentionally determines the target temperature so that the indoor temperature is lower than the lower limit of the comfortable room temperature range for summer. For example, control unit 16 lowers the target temperature from three hours before set time t18 (time t17) to four hours after set time t18 (time t19) so that the indoor temperature will be the lower limit of the comfortable room temperature range for summer at set time t18. Although the indoor temperature is lower than the lower limit of the comfortable room temperature range at time t19, control unit 16 maintains the lower indoor temperature for a while after time t19 to create an environment that makes it easier to wake up.

[0143] Similarly, in winter, when transitioning from period E3 to period G in Fig. 6, control unit 16 may determine the target temperature so that the indoor temperature is higher than the upper limit of the comfortable room temperature range for winter. For example, control unit 16 raises the target temperature from five hours before set time t24 (time t23) to six hours after set time t24 (time t25) so that the indoor temperature will be the upper limit of the comfortable room temperature range for winter at set time t24. Although the indoor temperature is higher than the upper limit of the comfortable room temperature range at time t25, control unit 16 maintains the higher indoor temperature for a while after time t25.

[0144] In one embodiment, the control unit 16 determines the target temperature so that the indoor temperature remains within the comfortable room temperature range even when transitioning from period E3 to period F or period G. For example, in summer, the control unit 16 lowers the target temperature over period F so that the indoor temperature remains within the comfortable room temperature range for summer even when four hours have passed since the set time t18 in Figure 5. Similarly, the control unit 16 raises the target temperature over period G so that the indoor temperature remains within the comfortable room temperature range for winter even when six hours have passed since the set time t24 in Figure 6.

[0145] The first to sixth body temperature thresholds, comfortable body temperature range, first body temperature change threshold, and second body temperature change threshold described above can be set depending on where the body temperature sensor 26 of the wearable device 20 is attached to the user. For example, different thresholds may be set for body temperatures detected from the back of the hand, wrist, neck, inner ear, or trunk. For example, the body temperature detected from the back of the hand or wrist is generally lower than the body temperature detected from the trunk. Therefore, when the wearable device 20 detects body temperature from the back of the hand or wrist, the control unit 16 executes the target temperature determination method using a relatively low threshold. Furthermore, these thresholds can be set to suit the user so that at least one specific user feels comfortable.

[0146] Furthermore, the comfortable body temperature range can be set based on the average human body temperature. For example, the average body temperature of Japanese people is said to be in the range of 36.89°C ± 0.34°C when measured under the arm. In other words, a body temperature between 36.55°C and 37.23°C is generally considered to be within the normal range. Also, as mentioned above, the temperature detected from the back of the hand or wrist is generally lower than the temperature detected from the armpit or torso. For example, the temperature difference between the wrist and armpit is generally said to be about 0.5°C to 1.0°C.

[0147] Body temperature fluctuates depending on various factors, such as a user's age, gender, physique, time of day, exercise, sleep, menstrual cycle, environment, and stress. The difference between the temperature detected from the wrist and the temperature detected from the torso may also be affected by individual differences, measurement method, environment, clothing, etc. Therefore, the various temperature thresholds, comfort temperature ranges, and comfortable room temperature ranges described in this disclosure can be set to suit at least one specific user.

[0148] In one embodiment, the comfortable body temperature range is set to a range of 35.75°C to 36.43°C based on the above values, and the first body temperature threshold for cooling operation is set to 36.5°C corresponding to the upper limit of the comfortable body temperature range, and the fourth body temperature threshold for heating operation is set to 35.8°C corresponding to the lower limit of the comfortable body temperature range.

[0149] In one example, the comfortable body temperature range is defined by the body temperature when the air conditioner is operating stably and the user's body temperature is stable. In another example, the comfortable body temperature range is defined as the heart rate when the user's body temperature is stable regardless of the air conditioner's operation.

[0150] In one embodiment, the second body temperature threshold for determining whether the room has been cooled sufficiently in cooling operation is set in the range of 35.5°C to 36.5°C.

[0151] In one embodiment, when the wearable device 20 detects body temperature from the back of the hand or wrist, the third body temperature threshold is set to 31°C, 32°C, or 33°C to prevent body temperature overshoot during cooling operation. While rapid cooling in hot weather provides a comfortable feeling to the user, a too low indoor temperature can have adverse effects on health. Therefore, the third body temperature threshold is set lower than the comfortable body temperature range, but is set to raise the indoor temperature when the body temperature drops below the third body temperature threshold.

[0152] In one embodiment, when the period B1 transitions to the period C1 (for example, at time t3 in FIG. 3), the control unit 16 predicts a tendency for the user's body temperature to decrease, and determines the target temperature so that the user's body temperature does not fall below the third body temperature threshold. In this case, even if the body temperature is equal to or higher than the third body temperature threshold, the control unit 16 determines that the period C1 is entering the latter stage when it determines that the decrease in the user's body temperature has stopped (for example, at time t4 in FIG. 3).

[0153] In one embodiment, the memory unit 14 stores a comfortable humidity range for summer and a comfortable humidity range for winter, which are related to the humidity at which the user feels comfortable. As an example, the comfortable humidity range for summer is 55% to 65% (relative humidity), and the comfortable humidity range for winter is 45% to 60% (relative humidity). However, the comfortable humidity ranges are not limited to these examples. The control unit 16 may determine the target temperature based on the target temperature determination method described in the first to third embodiments, and may control the air conditioning so as to maintain the indoor humidity within the comfortable humidity range.

[0154] The configurations and fluid analysis techniques of the above-described first to third embodiments can be combined.

[0155] (Other embodiments) (Addendum) The above description of the embodiments discloses the following techniques.

[0156] (Technology 1) An air conditioner that determines an appropriate target temperature for a controlled space that is the subject of air conditioning control, comprising a communication unit capable of communicating with a wearable device worn by a user, and a control unit, wherein the control unit acquires heart rate information relating to the user's heart rate and body temperature information relating to the user's body temperature from the wearable device via the communication unit, and determines the target temperature based on the heart rate information and the body temperature information.

[0157] This type of air conditioner determines the target temperature based on information about the user's heart rate and body temperature, thereby increasing comfort within the controlled space. Because the heart rate information and body temperature information are obtained from a wearable device worn by the user, accurate information can be obtained even if the user is in a position or state that makes it difficult for the air conditioner to detect the user's temperature directly. Furthermore, based on both the heart rate information and body temperature information, it is possible to determine the user's physical condition, such as whether they are feeling uncomfortable, or whether they are excited but uncomfortable with the room temperature, and to control the temperature according to the situation.

[0158] (Technology 2) In the air conditioner described in Technology 1, the control unit lowers the target temperature when, during cooling operation, it determines that the user's heart rate is unstable based on the heart rate information and that the body temperature is higher than a first body temperature threshold based on the body temperature information.

[0159] With this type of air conditioner, if the user's heart rate is unstable and their body temperature is high, for example, when they return home or wake up in summer, the target temperature can be lowered, thereby achieving a cool and comfortable indoor space during cooling operation.

[0160] (Technology 3) The air conditioner described in Technology 2, wherein the control unit determines that the heart rate is unstable when the heart rate is higher than a first heart rate threshold or when the amount of change in the heart rate is higher than a second heart rate threshold.

[0161] According to such an air conditioner, it is possible to determine whether or not the user's heart rate is stable based on the heart rate information.

[0162] (Technology 4) In an air conditioner according to Technology 2 or 3, when the control unit determines that the body temperature has become equal to or lower than a second body temperature threshold after lowering the target temperature during cooling operation, the control unit maintains the target temperature, and the second body temperature threshold is lower than the first body temperature threshold.

[0163] According to such an air conditioner, by maintaining a lower target temperature during cooling operation, it is possible to promote stabilization of the user's heart rate and prevent the user's body temperature from dropping too low.

[0164] (Technology 5) In an air conditioner as described in Technology 4, when the control unit determines that the user's heart rate is stable and that the body temperature has fallen below a third body temperature threshold during cooling operation, the control unit increases the target temperature, and the third body temperature threshold is lower than the second body temperature threshold.

[0165] With this type of air conditioner, once the user's heart rate has stabilized, it is possible to maintain an appropriate room temperature so that the user's body temperature does not drop too much.

[0166] (Technology 6) In an air conditioner according to Technology 5, the control unit, during cooling operation, reduces the rate at which the target temperature is increased if it determines that the amount of change in the body temperature is equal to or less than the first body temperature change amount threshold after the body temperature falls below the third body temperature threshold.

[0167] A decrease in the amount of change in the user's body temperature indicates that the body temperature is approaching a stable state. Therefore, by controlling the rate of change in the target temperature, the stabilization of the user's body temperature can be promoted.

[0168] (Technology 7) In an air conditioner according to Technology 6, the control unit, during cooling operation, acquires a comfortable body temperature range related to the body temperature at which the user feels comfortable, and after a first hour has elapsed since slowing down the rate at which the target temperature is being increased, lowers the target temperature so as not to exceed the comfortable body temperature range.

[0169] With this type of air conditioner, it is possible to control the target temperature so that the user's body temperature does not exceed the comfortable body temperature range.

[0170] (Technology 8) In the air conditioner described in Technology 7, the control unit reduces the first time if it determines that the body temperature has exceeded the comfortable body temperature range after the first time has elapsed.

[0171] According to this type of air conditioner, it is possible to learn about the first time period. By learning about the first time period, it is possible to more reliably prevent the body temperature from exceeding the comfortable body temperature range.

[0172] (Technology 9) An air conditioner according to any one of Technologies 1 to 8, wherein the control unit maintains the target temperature when it determines that the user's heart rate is stable and that the body temperature is stable.

[0173] With this type of air conditioner, it is possible to control the target temperature so as to maintain the user's heart rate and body temperature in a stable state.

[0174] (Technology 10) An air conditioner described in any one of Technologies 1 to 9, wherein the control unit, during heating operation, increases the target temperature when it determines based on the heart rate information that the user's heart rate is unstable and when it determines based on the body temperature information that the body temperature is below a fourth body temperature threshold.

[0175] With this type of air conditioner, if the user's heart rate is unstable and their body temperature is low, for example, when they return home or wake up in winter, the target temperature can be lowered, thereby achieving a warm and comfortable indoor space during heating operation.

[0176] (Technology 11) In the air conditioner described in Technology 10, when the control unit determines that the body temperature has become higher than a fifth body temperature threshold after increasing the target temperature during heating operation, the control unit maintains the target temperature, and the fifth body temperature threshold is higher than the fourth body temperature threshold.

[0177] According to such an air conditioner, by maintaining a higher target temperature during heating operation, it is possible to promote stabilization of the user's heart rate and prevent the user's body temperature from rising too much.

[0178] (Technology 12) In the air conditioner described in Technology 11, when the control unit determines that the user's heart rate is stable during heating operation and that the body temperature has become higher than a sixth body temperature threshold, the control unit lowers the target temperature, and the sixth body temperature threshold is higher than the fifth body temperature threshold.

[0179] With this type of air conditioner, once the user's heart rate has stabilized, it is possible to maintain an appropriate room temperature so that the user's body temperature does not rise too much.

[0180] (Technology 13) In the air conditioner described in Technology 12, when the control unit determines that the amount of change in body temperature is equal to or less than the second body temperature change amount threshold after the body temperature becomes higher than the sixth body temperature threshold during heating operation, the control unit reduces the rate at which the target temperature is lowered.

[0181] A decrease in the amount of change in the user's body temperature indicates that the body temperature is approaching a stable state. Therefore, by controlling the rate of change in the target temperature, the stabilization of the user's body temperature can be promoted.

[0182] (Technology 14) In the air conditioner described in Technology 13, the control unit, during heating operation, acquires a comfortable body temperature range related to the body temperature at which the user feels comfortable, and reduces the rate at which the target temperature is lowered, and then raises the target temperature after a second time has elapsed so that the comfortable body temperature range is not exceeded.

[0183] With this type of air conditioner, it is possible to control the target temperature so that the user's body temperature does not exceed the comfortable body temperature range.

[0184] (Technology 15) In the air conditioner described in Technology 14, the control unit reduces the second time period if it determines that the body temperature has exceeded the comfortable body temperature range after the second time period has elapsed.

[0185] According to this type of air conditioner, it is possible to learn about the second time period. By learning about the second time period, it is possible to more reliably prevent the body temperature from exceeding the comfortable body temperature range.

[0186] (Technology 16) An air conditioner described in any one of Technologies 1 to 15, wherein the control unit, during cooling operation, lowers the target temperature over a period from three hours before the set time of a timer that indicates the user's wake-up time to four hours after the set time, and maintains the target temperature after the fourth hour has passed since the set time.

[0187] This type of air conditioner can also determine the target temperature based on a timer that indicates the user's wake-up time. For example, in summer, the room temperature can be lowered around the time the user wakes up, creating a comfortable environment for the user when they wake up.

[0188] (Technology 17) An air conditioner described in any one of Technologies 1 to 16, wherein the control unit, during heating operation, raises the target temperature over a period from 5 hours before the set time of a timer that indicates the user's wake-up time to 6 hours after the set time, and maintains the target temperature after 6 hours have passed since the set time.

[0189] With this type of air conditioner, the target temperature can be determined based on a timer that indicates the user's wake-up time. For example, in winter, the room temperature can be raised around the time the user wakes up, creating a comfortable environment for the user when they wake up.

[0190] (Technology 18) The air conditioner according to Technology 16 or 17, further including a memory unit, in which a heart rate change standard used as an indicator of comfort is stored, and the control unit learns the target temperature when the fourth hour or the sixth hour has elapsed from the set time based on the heart rate information and the heart rate change standard.

[0191] With this type of air conditioner, it is possible to determine, for example, whether the user's heart rate has suddenly increased based on changes in heart rate. Then, based on the determination result, it is possible to learn the target temperature when the fourth or sixth hour has passed. This learning makes it possible to further increase comfort upon waking up in the controlled space and suppress changes in heart rate upon waking up.

[0192] (Technology 19) The control unit calculates the amount of change in heart rate based on the heart rate information, and in cooling operation, if the amount of change is higher than the heart rate change standard, lowers the target temperature when the fourth hour has elapsed from the set time by a first adjustment value; in cooling operation, if the amount of change is equal to or less than the heart rate change standard, raises the target temperature when the fourth hour has elapsed from the set time by a second adjustment value; in heating operation, if the amount of change is higher than the heart rate change standard, raises the target temperature when the sixth hour has elapsed from the set time by a third adjustment value; and in heating operation, if the amount of change is equal to or less than the heart rate change standard, lowers the target temperature when the sixth hour has elapsed from the set time by a fourth adjustment value. An air conditioner described in any one of Technologies 16 to 18.

[0193] With this type of air conditioner, for example, if the user's heart rate suddenly increases, the target temperature can be adjusted when the fourth or sixth hour has passed. Furthermore, when adjusting the target temperature, by making small adjustments using the first or second adjustment value, it is possible to avoid drastic changes to the room temperature and create an indoor space that is comfortable for the user.

[0194] (Technology 20) The air conditioner according to any one of Technologies 1 to 19, wherein the body temperature is a temperature detected from the skin of the user's hands or feet.

[0195] With this type of air conditioner, the wearable device can determine the target temperature based on the temperature detected from the skin of the user's hands or feet, and can obtain body temperature from the skin of the user's hands or feet even if the user is in a position or state that makes it difficult for the air conditioner to detect the temperature directly.

[0196] (Technology 21) A target temperature determination method for determining an appropriate target temperature for a controlled space that is the target of air conditioning control by an air conditioner, the target temperature determination method including the steps of: acquiring heart rate information relating to the user's heart rate and body temperature information relating to the user's body temperature from a wearable device worn by the user; and determining the target temperature based on the heart rate information and the body temperature information.

[0197] This target temperature determination method allows accurate information to be obtained even when the user is in a position or state that makes it difficult for the air conditioner to detect the user directly. Since the target temperature is determined based on information about the user's heart rate and body temperature, the target temperature is determined based on the user's physical condition, making it possible to increase comfort within the controlled space.

[0198] (Technology 22) A computer program for causing an air conditioner to execute the target temperature determination method described in Technology 21.

[0199] This program allows accurate information to be obtained even when the user is in a position or condition that makes it difficult for the air conditioner to detect the user directly. Since the target temperature is determined based on information about the user's heart rate and body temperature, the target temperature is determined according to the user's physical condition, thereby increasing comfort within the controlled space.

[0200] (Technology 23) A non-transitory computer-readable storage medium having a computer program stored therein, wherein the computer program, when executed by a processor, realizes the target temperature determination method described in Technology 21. A non-transitory computer-readable storage medium.

[0201] This storage medium allows accurate information to be acquired even when the user is in a position or condition that makes it difficult for the air conditioner to detect the user directly. Since the target temperature is determined based on information about the user's heart rate and body temperature, the target temperature is determined according to the user's physical condition, thereby increasing comfort within the controlled space.

[0202] The above are merely specific embodiments of the present disclosure, and the scope of protection of the present disclosure is not limited thereto. The present disclosure includes the contents described above in the drawings and the specific embodiments described above, but the present disclosure is not limited thereto. Various disclosed embodiments or examples can be combined without departing from the scope or spirit of the present disclosure. Modifications that do not depart from the functional and structural principles of the present disclosure are within the scope of the claims. [Explanation of symbols]

[0203] 10 Air conditioner 12 Communications Department 14 Storage section 16 Control Unit 20 Wearable Devices 22 Communications Department 24 Heart Rate Sensor 26 Body Temperature Sensor 30 servers 40 External information sources a1~a8 area t1~t26 time tt1~tt6 1st body temperature threshold to 6th body temperature threshold ht1 First heart rate threshold

Claims

1. An air conditioner that determines an appropriate target temperature for a control space that is the target of air conditioning control, a communication unit capable of communicating with a wearable device worn by a user; A control unit, The control unit acquiring heart rate information relating to the heart rate of the user and body temperature information relating to the body temperature of the user from the wearable device via the communication unit; determining the target temperature based on the heart rate information and the body temperature information; Air conditioner.

2. the control unit, during the cooling operation, when determining that the user's heart rate is unstable based on the heart rate information and determining that the body temperature is higher than a first body temperature threshold based on the body temperature information, lowers the target temperature. The air conditioner according to claim 1.

3. The control unit determines that the heart rate is unstable when the heart rate is higher than a first heart rate threshold or when a change in the heart rate is higher than a second heart rate threshold. The air conditioner according to claim 2.

4. When the control unit determines that the body temperature has become equal to or lower than a second body temperature threshold after lowering the target temperature during the cooling operation, the control unit maintains the target temperature; The second temperature threshold is lower than the first temperature threshold. The air conditioner according to claim 2.

5. When the control unit determines that the heart rate of the user is stable and that the body temperature is equal to or lower than a third body temperature threshold during the cooling operation, the control unit increases the target temperature; The third body temperature threshold is lower than the second body temperature threshold. The air conditioner according to claim 4.

6. When the control unit determines that the change amount of the body temperature is equal to or less than the first body temperature change amount threshold after the body temperature becomes equal to or less than the third body temperature threshold during the cooling operation, the control unit reduces the rate at which the target temperature is increased. The air conditioner according to claim 5.

7. The control unit, in cooling operation, obtaining a comfortable body temperature range associated with a body temperature at which the user feels comfortable; After a first time has elapsed since the rate at which the target temperature is increased is reduced, the target temperature is decreased so as not to exceed the comfortable body temperature range. The air conditioner according to claim 6.

8. When the control unit determines that the body temperature exceeds the comfortable body temperature range after the first time period has elapsed, the control unit decreases the first time period. The air conditioner according to claim 7.

9. When the control unit determines that the heart rate of the user is stable and the body temperature is stable, the control unit maintains the target temperature. The air conditioner according to claim 1.

10. When the control unit determines that the user's heart rate is unstable based on the heart rate information and determines that the body temperature is equal to or lower than a fourth body temperature threshold based on the body temperature information, during the heating operation, the control unit increases the target temperature. The air conditioner according to claim 1.

11. When the control unit determines that the body temperature has become higher than a fifth body temperature threshold after increasing the target temperature during the heating operation, the control unit maintains the target temperature; The fifth body temperature threshold is higher than the fourth body temperature threshold. The air conditioner according to claim 10.

12. When the control unit determines that the heart rate of the user is stable and that the body temperature is higher than a sixth body temperature threshold during the heating operation, the control unit lowers the target temperature; The sixth body temperature threshold is higher than the fifth body temperature threshold. The air conditioner according to claim 11.

13. When the control unit determines that the change amount of the body temperature is equal to or less than the second body temperature change amount threshold after the body temperature becomes higher than the sixth body temperature threshold during the heating operation, the control unit reduces the rate at which the target temperature is lowered. The air conditioner according to claim 12.

14. The control unit, in the heating operation, obtaining a comfortable body temperature range associated with a body temperature at which the user feels comfortable; After a second time has elapsed since the rate at which the target temperature is decreased is reduced, the target temperature is increased so as not to exceed the comfortable body temperature range. The air conditioner according to claim 13.

15. When the control unit determines that the body temperature exceeds the comfortable body temperature range after the second time period has elapsed, the control unit decreases the second time period. The air conditioner according to claim 14.

16. The control unit In the cooling operation, the target temperature is lowered over a period from three hours before a set time of a timer that indicates the wake-up time of the user to a fourth hour after the set time, After the fourth time has elapsed from the set time, the target temperature is maintained. The air conditioner according to claim 1.

17. The control unit In the heating operation, the target temperature is increased over a period from five hours before a set time of a timer that indicates the wake-up time of the user to six hours after the set time, After the sixth time has elapsed from the set time, the target temperature is maintained.

17. The air conditioner according to claim 16.

18. The air conditioner further includes a memory unit, The storage unit stores a heart rate change standard that is used as an index of comfort, the control unit learns the target temperature when the fourth hour or the sixth hour has elapsed from the set time based on the heart rate information and the heart rate change criterion.

18. The air conditioner according to claim 17.

19. The control unit calculating a change in heart rate based on the heart rate information; In the cooling operation, if the amount of change is higher than the heart rate change standard, the target temperature when the fourth time has elapsed from the set time is lowered by a first adjustment value; In the cooling operation, when the amount of change is equal to or less than the heart rate change standard, the target temperature when the fourth time has elapsed from the set time is increased by a second adjustment value; In the heating operation, if the amount of change is higher than the heart rate change standard, the target temperature when the sixth hour has elapsed from the set time is increased by a third adjustment value; In the heating operation, when the amount of change is equal to or less than the heart rate change standard, the target temperature when the sixth hour has elapsed from the set time is reduced by a fourth adjustment value.

19. The air conditioner according to claim 18.

20. The body temperature is the temperature detected from the skin of the user's hands or feet. The air conditioner according to claim 1.

21. A target temperature determination method for determining an appropriate target temperature for a control space that is the target of air conditioning control by an air conditioner, comprising: acquiring heart rate information relating to a heart rate of the user and body temperature information relating to a body temperature of the user from a wearable device worn by the user; determining the target temperature based on the heart rate information and the body temperature information; Including, Target temperature determination method.

22. A computer program comprising: A computer program for causing an air conditioner to execute the target temperature determination method according to claim 21. Computer program.

23. A non-transitory computer-readable storage medium on which a computer program is stored, The computer program, when executed by a processor, implements the target temperature determination method of claim 21. A non-transitory computer-readable storage medium.

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