JPWO2016103394A1 - State detection system, air conditioning control system, and state detection method - Google Patents

Abstract

The receiver (20) receives a radio signal from the transmitter (10) via a plurality of propagation paths (P1-P4), measures the received signal strength of the radio signal, and measures the standard deviation of the measured received signal strength. And comparing the standard deviation with the first and second thresholds, the first state where there is no person in the space, the second state where the activity level of the person existing in the space is low, and It is determined which state is the third state where the activity level of the person existing in the space is high.

Description

  The present invention relates to a state detection system, an air conditioning control system, and a state detection method that can detect not only whether or not a person is present in a space but also a state including the degree of activity of the person.

  Conventionally, a location detection system has been proposed as a system for detecting whether or not a person is present (located) on a floor in a building or a room in the floor. For example, Patent Document 1 discloses an invention of a location detection system (person location detection system) using TV broadcast radio waves using an indoor radio multipath environment. Patent Document 2 discloses an invention of a location detection system that detects the presence of a person in a simple and wide range while reducing power consumption.

JP 2006-221213 A International Publication No. 2012/137285

  However, the above-described conventional location detection system detects only whether or not a person exists in the space to be detected (that is, presence or absence). Therefore, simple control according to any detection result is performed, and there is a case where appropriate control is not performed when a person exists in the space. For example, regardless of whether a person in the space is walking around or sitting on a chair, the conventional area detection system only performs a single control.

  The present invention has been made to solve the above problems, and is a state detection system that can detect not only whether or not a person is present in a space but also a state including the degree of activity of the person that is present. An object of the present invention is to provide an air conditioning control system and a state detection method.

In order to achieve the above object, a state detection system according to the present invention includes:
A state detection system comprising: a transmitter that transmits radio waves; and a receiver that receives multipath radio signals caused by the transmitted radio waves, and at least the receiver is disposed in a space to be detected. And
The receiver
Based on the variation in received signal strength in the radio signal received a plurality of times at regular intervals, a state in which no person is present in the space, and a plurality of states in which the degree of activity of the person existing in the space is different, A determination unit for determining which state is present;
Is provided.

  According to the present invention, the determination unit is based on the variation in the received signal strength in the radio signal, and the state in which no person is present in the space and the state in which the degree of activity of the person existing in the space is different, It is determined in which state. As a result, it is possible to detect not only whether or not there is a person in the space but also the state including the degree of activity of the person.

It is a schematic diagram which shows schematic structure of the state detection system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the receiver in a state detection system. It is a block diagram for demonstrating a 1st threshold value and a 2nd threshold value. It is a graph which shows an example of the received signal strength of a radio signal when a person is absent in the room. It is a graph which shows an example of the received signal strength of a radio signal in the case of sitting on a chair existing indoors. It is a graph which shows an example of the received signal strength of a radio signal when the person who exists indoors is walking around. It is a flowchart which shows an example of the state detection process which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows schematic structure of the air-conditioning control system which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the transmitter in an air conditioning control system. It is a block diagram which shows the structure of the receiver in an air-conditioning control system. It is a sequence diagram for demonstrating the whole operation | movement of an air-conditioning control system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. In the following, first, a state detection system of the present invention will be described as Embodiment 1, and then an air conditioning control system that is an application example of the present invention will be described as Embodiment 2. The air conditioning control system to which the present invention is applied is an example, and can be similarly applied to a system for controlling other devices, as will be described later. That is, the embodiment described below is for explanation, and does not limit the scope of the present invention. Therefore, those skilled in the art can employ embodiments in which each or all of these elements are replaced with equivalent ones, and these embodiments are also included in the scope of the present invention.

(Embodiment 1)
FIG. 1 is a schematic diagram showing a schematic configuration of a state detection system 1 according to Embodiment 1 of the present invention. For example, the state detection system 1 is arranged in a space to be detected and detects not only whether or not a person exists in the space but also a state including the degree of activity of the person. Hereinafter, a case where the state detection system 1 is disposed indoors (in the room R) will be described as an example, but the space to be detected is not limited to such an indoor space and may be outdoors.

  As shown in FIG. 1, the state detection system 1 includes a transmitter 10 and a receiver 20. Both the transmitter 10 and the receiver 20 are installed in a room R (indoor) to be detected. In the state detection system 1, the receiver 20 receives a multipath radio signal caused by the radio wave transmitted from the transmitter 10, so that the person H is not present in the room and the person H present in the room is present. It is detected which state is a plurality of states having different activity levels.

  The transmitter 10 is a device that periodically transmits radio waves with constant transmission power. For example, the transmitter 10 is communicably connected to the receiver 20 via a wireless local area network (LAN) or a specific low-power radio of 920 MHz band or 400 MHz band, and periodically emits a beacon signal, a communication signal, and the like. . The transmitter 10 can be used as long as it is a device that stays on the spot for a certain period of time and periodically transmits radio waves with a certain transmission output. For example, a device such as an air conditioner remote control or a PC (personal computer) capable of Wi-Fi communication may be used for the transmitter 10. However, it cannot be used as the transmitter 10 when the device is moving, such as while the notebook PC is being carried. In addition, for example, a device that receives a broadcast wave of television or radio and transfers it to the room H may be used as the transmitter 10.

  The room R in which the transmitter 10 and the transmitter 20 are arranged is a target space where the person H enters and exits and the state is detected. Note that the target space is not limited to a single room, and may span a plurality of rooms. Further, as described above, the target space is not limited to such an indoor space, but may be an outdoor space.

  The radio wave transmitted from the transmitter 10 is repeatedly reflected, transmitted, and diffracted by indoor wall surfaces, ceilings, floors, or fixtures arranged, for example, as multipath radio signals that have passed through propagation paths P1 to P4, etc. Reach the receiver 20.

  FIG. 2 shows the configuration of the receiver 20. As illustrated, the receiver 20 includes an antenna 21, a radio circuit 22, a received signal strength measurement circuit 23, a state determination unit 24, a storage unit 25, and an adjustment unit 26.

  The antenna 21 receives a radio signal (radio wave) transmitted from the transmitter 10. The antenna 21 preferably has a small directivity such as a dipole antenna so as to easily receive the multipath radio signal described above. A radio signal received by the antenna 21 is input to the radio circuit 22.

  The radio circuit 22 includes, for example, a filter that limits the band of a radio signal, an amplifier that amplifies the radio signal, and the like. The output of the radio circuit 22 is input to the received signal strength measurement circuit 23.

  The received signal strength measurement circuit 23 measures the received signal strength indicator (RSSI) of the radio signal based on the output of the radio circuit 22. The received signal strength measured by the received signal strength measuring circuit 23 is supplied to the state determining unit 24.

  The state determination unit 24 determines whether or not the person H exists in the room based on the variation in the received signal strength of the measured radio signal, and among the plurality of states in which the activity level of the person H existing in the room is different. Which state is determined. For example, based on the standard deviation of the received signal strength, the state determination unit 24 performs a first state in which the person H is absent in the room, or a second state in which the activity level of the person H existing in the room is low (for example, the person H Is sitting in a chair) and a third state where the activity level of the person H present in the room is high (for example, a state where the person H is walking around) is determined. Specifically, the state determination unit 24 performs state determination using threshold values (a first threshold value and a second threshold value described later) stored in the storage unit 25. Therefore, details of the state determination will be described together with the description of the storage unit 25 described later.

  The storage unit 25 is configured by, for example, a flash memory or a RAM (Random Access Memory), and stores data such as a threshold used when the state determination unit 24 performs state determination and a determination result by the state determination unit 24. The threshold value stored in the storage unit 25 includes a first threshold value and a second threshold value. Hereinafter, the first and second threshold values will be described with reference to FIG.

  FIG. 3 is a schematic diagram for explaining the first and second threshold values. The vertical axis in the figure indicates the standard deviation (RSSI standard deviation [dB]) of the received signal strength, in which the first threshold (for example, 0.3 [dB]) and the second A threshold value (as an example, 1.0 [dB]) is defined. On the other hand, the horizontal axis in the figure indicates the first to third states, and the standard deviations SD1 to SD3 corresponding to each are plotted. The standard deviations SD1 to SD3 will be described together with the description of the received signal strength described later.

  As described above, the first state is a state in which no person H is present in the room, while the second and third states are states in which the person H is present in the room. The second state is a state where the activity level of the existing person H is low (for example, a state where the person H is sitting on a chair), and the third state is a level of activity of the existing person H. A high state (for example, a state where the person H is walking around). In order to discriminate between these first to third states, first and second threshold values are set.

  That is, the state determination unit 24 described above obtains the standard deviation of the received signal strength in the radio signal received a plurality of times (for example, 30 times) at a constant interval (for example, 1 second interval), And the second threshold value is compared to determine the state.

  Specifically, the state determination unit 24 determines that the state is the first state if the standard deviation of the received signal strength is equal to or less than the first threshold. Moreover, the state determination part 24 will determine with it being a 2nd state, if the standard deviation of a received signal strength is larger than a 1st threshold value and below a 2nd threshold value. And the state determination part 24 will determine with it being a 3rd state, if the standard deviation of a received signal strength is larger than a 2nd threshold value.

  Returning to FIG. 2, the adjustment unit 26 adjusts the threshold values (first and second threshold values described above) used for the determination of the state based on the reception signal strength and the like measured previously. For example, in the initial stage, the state determination unit 24 described above performs state determination using an initial threshold value. Meanwhile, the adjustment unit 26 accumulates a history of received signal strength. When the received signal strength history is accumulated to some extent, the adjustment unit 26 adjusts the threshold based on the accumulated received signal strength history. And the state determination part 24 performs a state determination more appropriately using the adjusted threshold value.

  The state determination unit 24 and the adjustment unit 26 are, for example, microcomputers, and each function is realized by a CPU (Central Processing Unit) executing a program stored in a memory.

  Returning to FIG. 1, the transmitter 10 periodically transmits a signal (such as a beacon signal or a communication signal) when the operation starts. For example, when the transmitter 10 is a base unit of a wireless LAN, signals are generally transmitted at intervals of about 100 ms.

  The signal transmitted from the transmitter 10 reaches the receiver 20 through the propagation paths P1 to P4. At that time, when there is no person H in the room (absence), there is no fluctuation in the propagation path, and the received signal strength of the radio signal in the receiver 20 is stabilized. For example, when the person H is not present in the room, the received signal strength becomes a substantially constant value as shown in FIG. 4A.

  On the other hand, when a person H is present in the room, any one of the propagation paths P1 to P4 is blocked or reflected by the person H, so that the received signal strength of the radio signal in the receiver 20 is not stable. . In the state where the person H exists in the room, for example, as shown in FIGS. 4B and 4C, the received signal strength varies. The magnitude of this variation varies depending on the activity level of the person H. As an example, FIG. 4B is a plot of received signal strength when person H is sitting on a chair. FIG. 4C is a plot of the received signal strength when the person H is walking around. That is, the received signal strength varies greatly as the activity level of the person H existing in the room increases. For example, when the person H is walking, a fluctuation of 10 [dB] to 15 [dB] occurs within a few seconds and becomes a big fluctuation. In general, the variation of the variation increases as the arm, foot, or standing position changes greatly.

  The state determination unit 24 of the receiver 20 obtains such a standard deviation of the received signal strength, compares the obtained standard deviation with the above-described first and second threshold values, and makes a state decision. For example, when the standard deviation is obtained from the received signal strength as shown in FIG. 4A, it belongs to a range equal to or less than the first threshold as the standard deviation SD1 in FIG. 3 described above. As an example, the standard deviation of the received signal strength in the absence is 0.06 [dB] to 0.2 [dB], which is equal to or less than the first threshold (0.3 [dB]). Therefore, the state determination part 24 determines with the 1st state where the person H does not exist indoors, when the calculated | required standard deviation is below a 1st threshold value.

  Further, when the standard deviation is obtained from the received signal strength as shown in FIG. 4B, it belongs to a range larger than the first threshold and equal to or smaller than the second threshold as the standard deviation SD2 in FIG. 3 described above. As an example, the standard deviation of the received signal strength when doing deskwork or the like is 0.5 [dB] to 0.8 [dB], which is larger than the first threshold (0.3 [dB]), and The second threshold value (1.0 [dB]) or less. Therefore, the state determination unit 24 is the second state in which the activity level of the person H existing in the room is low when the obtained standard deviation is larger than the first threshold and not more than the second threshold. Is determined.

  Further, when the standard deviation is obtained from the received signal strength as shown in FIG. 4C, it belongs to a range larger than the second threshold as the standard deviation SD3 in FIG. 3 described above. As an example, the standard deviation of the received signal strength when walking is 1.3 [dB] to 4.2 [dB], which is larger than the second threshold (1.0 [dB]). Therefore, the state determination unit 24 determines that the activity level of the person H existing in the room is high in the third state when the obtained standard deviation is larger than the second threshold value.

  Hereinafter, the operation of the state detection system 1 having such a configuration will be described with reference to FIG. FIG. 5 is a flowchart showing an example of the state detection process according to the first embodiment of the present invention. This state detection process is repeatedly executed.

  First, the receiver 20 receives the radio signal transmitted from the transmitter 10 once and measures the received signal strength (step S101). That is, the radio signal received by the antenna 21 of the receiver 20 is input to the received signal strength measurement circuit 23 via the radio circuit 22. Then, the received signal strength measurement circuit 23 measures the received signal strength of the received radio signal. The measured received signal strength is supplied to the state determination unit 24.

  The receiver 20 waits for a predetermined time and adds the number of acquisitions (step S102). For example, the receiver 20 waits for 1 second and adds 1 to a counter that counts the number of times of reception signal strength acquisition.

  The receiver 20 determines whether or not the number of acquisitions has reached the specified number (step S103). For example, the receiver 20 determines whether or not the number of times of reception signal strength acquisition has reached 30. When the receiver 20 determines that the number of acquisitions has not reached the specified number (step S103; No), the process returns to step S101 described above.

  On the other hand, when it is determined that the number of acquisitions has reached the specified number (step S103; Yes), the receiver 20 calculates a standard deviation of the received signal strength (step S104). Then, the receiver 20 compares the calculated standard deviation with a threshold value (first and second threshold values) as follows.

  The receiver 20 determines whether or not the standard deviation is equal to or smaller than the first threshold (step S105). That is, the state determination unit 24 determines whether or not the calculated standard deviation is equal to or less than the first threshold as shown in FIG.

  When the receiver 20 determines that the standard deviation is equal to or less than the first threshold (step S105; Yes), the receiver 20 determines that the person H is in the first state (step S106).

  On the other hand, when it is determined that the standard deviation is not equal to or smaller than the first threshold (greater than the first threshold) (step S105; No), the receiver 20 determines whether the standard deviation is equal to or smaller than the second threshold. Is determined (step S107). That is, the state determination unit 24 determines whether or not the calculated standard deviation is equal to or less than the second threshold value (greater than the first threshold value) as shown in FIG.

  When the receiver 20 determines that the standard deviation is equal to or smaller than the second threshold (step S107; Yes), the receiver 20 determines that the second person has a low activity level (step S108).

  On the other hand, when it is determined that the standard deviation is not less than or equal to the second threshold (greater than the second threshold) (step S107; No), the receiver 20 is in the third state in which the activity level of the existing person H is high. Is determined (step S109).

  As described above, according to the state detection system 1 according to the first embodiment, the receiver 20 receives a plurality of radio signals transmitted from the transmitter 10 at regular intervals, and the received signal strength in the received radio signals. Based on the standard deviation, the first state in which the person H is absent in the room, the second state in which the person H existing in the room has a low activity level, and the activity level of the person H existing in the room is high in the third state. Which of the states is determined. As a result, it is possible to detect not only whether or not there is a person in the room but also the state including the degree of activity of the person.

(Embodiment 2)
Next, an air conditioning control system 2 according to Embodiment 2 of the present invention, which is an application example of the state detection system 1, will be described.

  FIG. 6 is a schematic diagram showing a schematic configuration of an air conditioning control system 2 according to Embodiment 2 of the present invention. For example, the air conditioning control system 2 is arranged in a space to be detected, detects not only whether or not a person exists in the space, but also a state including the degree of activity of the existing person. The machine 50 is controlled. Hereinafter, a case where the air conditioning control system 2 is disposed indoors (in the room R) will be described as an example. However, the space to be detected is not limited to such an indoor space, and may be outdoors.

  As shown in FIG. 6, the air conditioning control system 2 includes a transmitter 30, a receiver 40, and an air conditioner 50. The receiver 40 and the air conditioner 50 are connected via a communication cable 60. The transmitter 30, the receiver 40, and the air conditioner 50 are all installed in a room R (indoor) that is a detection target. In the air conditioning control system 2, the receiver 40 receives a multipath radio signal due to the radio wave transmitted from the transmitter 30, so that the person H is not present in the room and the person H present in the room is present. It is detected from among a plurality of states having different degrees of activity, and the air conditioner 50 is appropriately controlled according to the detection result. 6 shows a case where only one air conditioner 50 is arranged for simplification, a plurality of air conditioners 50 may be arranged.

  FIG. 7 shows the configuration of the transmitter 30. The transmitter 30 is, for example, a wireless sensor terminal, and includes an antenna 31, a wireless circuit 32, a control unit 33, a temperature sensor 34, a humidity sensor 35, and an illuminance sensor 36 as illustrated.

  The antenna 31 transmits (releases) a radio signal input from the radio circuit 32. Since the antenna 31 transmits a radio signal without directivity, an antenna having a small directivity such as a dipole antenna is preferable. The radio signal transmitted from the antenna 31 is received by the receiver 40.

  The radio circuit 32 includes, for example, a filter that limits the band of a radio signal, an amplifier that amplifies the radio signal, and the like. The output of the radio circuit 32 is input to the antenna 31.

  The control unit 33 performs overall control of the transmitter 30. The control unit 33 causes environmental information measured by a temperature sensor 34 described later or the like to be transmitted as a radio signal from the radio circuit 32 (antenna 31). Further, the control unit 33 controls timing for operating the wireless circuit 32. For example, the control unit 33 can control the timing at which the radio circuit 32 operates to switch the radio signal transmission interval. Various switching methods can be used as follows. For example, the control unit 33 switches the radio signal transmission interval in response to a command or the like sent from the receiver 40 to the transmitter 30. The radio signal transmission interval may be switched according to the setting of a switch (not shown) provided in the transmitter 30. Also, the transmission interval may be set when the program is written in the control unit 33.

  Each sensor (temperature sensor 34, humidity sensor 35, and illuminance sensor 36) measures indoor environmental information such as temperature, humidity, and illuminance, respectively. Each sensor supplies the measured environment information to the control unit 33. Each sensor may store the environmental information in a storage unit (not shown) instead of supplying the measured environmental information directly to the control unit 33. In this case, the control unit 33 reads the stored environment information from the storage unit when performing transmission.

  FIG. 8 shows the configuration of the receiver 40. The receiver 40 is, for example, an air conditioning control terminal or the like. As shown in the figure, the antenna 21, the radio circuit 22, the received signal strength measurement circuit 23, the state determination unit 24, the storage unit 25, and the adjustment unit 26. And a control unit 41. Note that the antennas 21 to 26 have the same configuration as the receiver 20 shown in FIG.

  The control unit 41 receives the determination result of the state determination unit 24 and controls the air conditioner 50. As described above, the state determination unit 24 is based on the measured standard deviation of the received signal strength, in the first state where the person H is absent in the room, the second activity level of the person H present in the room is low. It is determined which of the state and the third state where the activity level of the person H existing in the room is high. Therefore, the control part 41 controls the air conditioner 50 according to these 1st-3rd states (a change of a state is also included).

  The air conditioner 50 is, for example, a wall-mounted device, is disposed on the wall in the room R, and is controlled by the receiver 40 via the communication cable 60. The air conditioner 50 may be a ceiling-embedded or floor-standing device. Further, as described above, a plurality of air conditioners 50 may be arranged. The air conditioner 50 includes, for example, an expansion valve and a load-side heat exchanger, and is connected to an outdoor unit (not shown) by piping. The air conditioner 50 performs air conditioning in the room R by evaporating or condensing the refrigerant in the load side heat exchanger.

  Hereinafter, the operation of the air conditioning control system 2 having such a configuration will be described with reference to FIG. FIG. 9 is a sequence diagram for explaining the overall operation of the air conditioning control system 2.

  First, it starts from the first state in which the person H is absent in the room R (indoor). The transmitter 30 measures environmental information including temperature, humidity, and illuminance, and transmits the measured environmental information (wireless signal) (Sq201). The environmental information is transmitted sequentially at regular intervals.

  The receiver 40 obtains a standard deviation of the environment information (wireless signal) received a specified number of times, compares the obtained standard deviation with a threshold value (first and second threshold values), and in this case, detects the first state. (Sq202). Thus, since there is no person H in the room, the air conditioner 50 is operating in the energy saving mode (Sq203). This energy saving mode is a driving operation for reducing power consumption with a comparatively light comfort. For example, the air conditioner 50 performs control such that the temperature is lowered to around the set temperature by pre-cooling operation or pre-warming operation. In addition, the air conditioner 50 may reduce the power consumption as a whole by limiting the control of air conditioning to the necessary minimum so that the temperature continues for a certain period. Further, the air conditioner 50 may automatically turn off the power and stop the operation.

  In the first state where no person H is present in the room, the air conditioner 50 maintains the operation in the energy saving mode. In the meantime, the transmitter 30 continues to transmit the environment information, and the receiver 40 continues to receive the environment information.

  Thereafter, it is assumed that a person H enters the room. For example, when the person H walks into the room, the state changes to the third state where the activity level of the person H existing in the room is high. That is, the state changes from the first state to the third state. The transmitter 30 measures the environment information and transmits the measured environment information in the same manner as described above (Sq204). The environmental information is transmitted sequentially at regular intervals.

  The receiver 40 obtains the standard deviation of the environmental information received the specified number of times, compares the obtained standard deviation with a threshold value, and in this case, detects the third state (Sq205). That is, the received signal strength of the radio signal varies greatly, and its standard deviation exceeds the second threshold value. Moreover, such a walking motion is a very large motion and can be easily detected. In order to detect a change from the first state to the third state this time, the receiver 40 instructs the air conditioner 50 to enter the normal mode (Sq206). When receiving the instruction, the air conditioner 50 operates in the normal mode (Sq207).

  Thereafter, while the person H continues walking, the transmitter 30 measures the environmental information and transmits the measured environmental information in the same manner as described above (Sq208). The receiver 40 obtains the standard deviation of the environmental information received the specified number of times, compares the obtained standard deviation with the threshold value, and in this case, still detects the third state (Sq209). That is, in the third state where the activity level of the person H present in the room is high, the air conditioner 50 maintains the operation in the normal mode. In the meantime, the transmitter 30 continues to transmit the environment information, and the receiver 40 continues to receive the environment information.

  Thereafter, it is assumed that the person H is seated. For example, when the person H who was walking sits down on the chair, the activity level of the person H present in the room changes to the second state. The transmitter 30 measures the environmental information and transmits the measured environmental information in the same manner as described above (Sq210). The environmental information is transmitted sequentially at regular intervals.

  The receiver 40 obtains the standard deviation of the environmental information received the specified number of times, compares the obtained standard deviation with the threshold value, and in this case, detects the second state (Sq211). That is, the fluctuation of the received signal strength of the radio signal is slightly reduced, and the standard deviation is equal to or less than the second threshold (greater than the first threshold). This time, since the change from the third state to the second state is also detected, the receiver 40 instructs the air conditioner 50 in the air blowing mode (Sq212). When the air conditioner 50 receives the instruction, the air conditioner 50 operates in the air blowing mode (Sq213). This air blowing mode is also called a refresh mode, and is a function that, for example, arouses air and refreshes after a certain time when it is determined that the person H is sitting for a long time. Therefore, the above-described instruction of Sq212 may be transmitted after the second state is maintained for a certain period of time.

  Thereafter, while the person H continues to sit on the chair, the transmitter 30 measures the environmental information and transmits the measured environmental information in the same manner as described above (Sq214). The receiver 40 obtains the standard deviation of the environmental information received the specified number of times, compares the obtained standard deviation with the threshold value, and in this case, still detects the second state (Sq215). That is, in the second state where the activity level of the person H present in the room is low, the air conditioner 50 maintains the operation in the air blowing mode. In the meantime, the transmitter 30 continues to transmit the environment information, and the receiver 40 continues to receive the environment information.

  As described above, according to the air conditioning control system 2 according to the second embodiment, the receiver 40 receives a plurality of environment information (radio signals) transmitted from the transmitter 30 at regular intervals, and receives the received environment information. Based on the standard deviation of the received signal strength in the first state where the person H is not present in the room, the second state in which the person H present in the room has a low degree of activity, and the degree of activity of the person H present in the room It is determined which of the third states is high. And the receiver 40 controls the air conditioner 50 according to a determination result (a change of a state is also included). As a result, it is possible to appropriately control the air conditioner 50 by detecting not only whether or not there is a person in the room but also a state including the degree of activity of the person.

  Furthermore, according to the air conditioning control system 2, there is no need for a special transmitter such as a high-cost array antenna as in the prior art, and a normal transmitter 30 and an air conditioner 50 that are at least necessary for communication. By using the receiver 40 having a function as a remote control (air conditioning control terminal) capable of operating the air conditioning control system 2 using the state detection system 1 described above can be simplified without using a dedicated device. And it can be constructed at low cost.

(Other embodiments)
In the first and second embodiments described above, the case where the first threshold value and the second threshold value are used to determine which of the three states is determined has been described. You may make it determine in any one of four or more states.

  In the first and second embodiments, the case where the state is determined by obtaining the standard deviation from the received signal strength of the radio signal received a plurality of times at regular intervals has been described. For example, the power consumption may be reduced by widening the power. For example, normally, a radio signal is received at a first interval having a long time, and when the received signal strength changes, the radio signal is received at a second interval having a shorter time than the first interval. . And a standard deviation is calculated | required from the received signal strength of the radio signal received in multiple times at the 2nd space | interval, and a state is determined. In this case, since it is not necessary to always receive a radio signal, the state can be detected while reducing power consumption.

  In the first and second embodiments, the case where the transmitters 10 and 30 are arranged in the room R has been described. However, radio waves (radio signals) from the transmitters 10 and 30 are transmitted into the room R. If there is, it may be arranged outside the room R. The transmitters 10 and 30 and the receivers 20 and 40 may be a communication system that transmits and receives data.

  In the second embodiment, the air conditioning control system 2 that controls the air conditioner 50 has been described. However, the present invention can be similarly applied to a system that controls other devices. For example, the present invention can be similarly applied to an illumination control system that controls an illumination device, an acoustic control system that controls an acoustic device, and the like.

  In the first and second embodiments described above, the case where the state determination or the state change is detected using only the standard deviation of the received signal strength is described. However, the state determination or the state change is detected using other information. May be. For example, the receivers 20 and 40 determine the state (any of the first to third states) using the average value of the received signal strength in the radio signal. Further, after determining that the receivers 20 and 40 are in the second or third state, if the average value of the received signal strength in the radio signal belongs to a different range, the person H existing in the room H It may be determined that the activity level has changed.

  In addition, when a state determination or a change in state is detected, a range to which most (for example, a majority) of received signal strengths in a radio signal belongs may be used. For example, the receivers 20 and 40 determine the state (any one of the first to third states) using which range each of the received signal strengths in the radio signal belongs to. In addition, after determining that the receivers 20 and 40 are in the second or third state, when most of the received signal strengths of the radio signals belong to different ranges, the person H existing in the room It may be determined that the activity level has changed.

  In the above embodiment, the case where the dedicated receivers 20 and 40 are used has been described. However, by applying an operation program that defines the operations of the receivers 20 and 40 to an existing personal computer or an information terminal device. The personal computer or the like can also function as the receivers 20 and 40 according to the present invention.

  Further, the distribution method of such a program is arbitrary. For example, the program can be read by a computer such as a CD-ROM (Compact Disk Read-Only Memory), a DVD (Digital Versatile Disk), an MO (Magneto Optical Disk), or a memory card. It may be distributed by storing in a recording medium, or distributed via a communication network such as the Internet.

  Various embodiments and modifications can be made to the present invention without departing from the spirit and scope of the broad sense. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

  The present invention can be employed in a state detection system, an air conditioning control system, and a state detection method that can detect not only whether or not a person is present in the space but also a state including the degree of activity of the person.

1 state detection system, 2 air conditioning control system, 10, 30 transmitter, 20, 40 receiver, 21, 31 antenna, 22, 32 radio circuit, 23 received signal strength measurement circuit, 24
State determination unit, 25 storage unit, 26 adjustment unit, 33, 41 control unit, 34 temperature sensor, 35 humidity sensor, 36 illuminance sensor, 50 air conditioner, 60 communication cable

In order to achieve the above object, a state detection system according to the present invention includes:
A state detection system comprising: a transmitter that transmits radio waves; and a receiver that receives multipath radio signals caused by the transmitted radio waves, and at least the receiver is disposed in a space to be detected. And
The transmitter is
A sensor device that measures environmental information including any of temperature, humidity, and illuminance in the space, and periodically transmits the wireless signal including the measured environmental information to the receiver. ,
The receiver
Based on the variation in received signal strength in the radio signal received a plurality of times at regular intervals, a state in which no person is present in the space, and a plurality of states in which the degree of activity of the person existing in the space is different, A determination unit for determining which state is present;
Is provided.

According to the present invention, the transmitter is a sensor device that measures environmental information including any of temperature, humidity, and illuminance in the space , and transmits a wireless signal including the measured environmental information to the receiver. To send regularly. And, the receiver, the determination unit, based on the variation in the received signal strength in the radio signal, a state where no person is present in the space, and a plurality of states where the degree of activity of the person existing in the space is different, It is determined in which state. As a result, it is possible to detect not only whether or not there is a person in the space but also the state including the degree of activity of the person.

Claims (12)

A state detection system comprising: a transmitter that transmits radio waves; and a receiver that receives multipath radio signals caused by the transmitted radio waves, and at least the receiver is disposed in a space to be detected. And
The receiver
Based on the variation in received signal strength in the radio signal received a plurality of times at regular intervals, a state in which no person is present in the space, and a plurality of states in which the degree of activity of the person existing in the space is different, A determination unit for determining which state is present;
A state detection system comprising: The determination unit
Based on the standard deviation of the received signal strength, the first state in which no person is present in the space, the second state in which the activity level of the person existing in the space is low, and the person present in the space It is determined which state is the third state in which the degree of activity is high.
The state detection system according to claim 1. The transmitter is
A device that is installed in the space and periodically transmits radio waves with a constant transmission power.
The state detection system according to claim 1. The transmitter is
A sensor device that measures environmental information including any of temperature, humidity, and illuminance in the space, and transmits the wireless signal including the measured environmental information to the receiver.
The state detection system according to claim 3. The receiver
A storage unit for storing a first threshold value and a second threshold value, each of which classifies a range of the standard deviation of the received signal strength;
The second threshold value is divided from the first threshold value in a range where the variation is large,
The determination unit
When the standard deviation of the received signal strength in the radio signal belongs to a range equal to or less than the first threshold, it is determined that the first state is present,
When the standard deviation of the received signal strength in the radio signal belongs to a range greater than the first threshold and less than or equal to the second threshold, it is determined as the second state,
When the standard deviation of the received signal strength in the wireless signal is larger than the second threshold, it is determined as the third state,
After the determination, when the standard deviation of the received signal strength in the wireless signal belongs to a different range, it is determined that the state has changed.
The state detection system according to claim 2. The receiver
An adjustment unit for adjusting at least the first threshold stored in the storage unit based on a history of received signal strength of the wireless signal;
The state detection system according to claim 5. The determination unit
After determining that the state is the second state or the third state, when the standard deviation of the received signal strength in the radio signal belongs to a different range, the activity level of the person existing in the space It is determined that there has been a change in
The state detection system according to claim 5. The determination unit
When determining the state, it further uses which range the average value of the received signal strength in the wireless signal belongs to,
After determining that the state is the second state or the third state, the activity level of the person existing in the space when the average value of the received signal strength in the radio signal belongs to a different range It is determined that there has been a change in
The state detection system according to claim 5. The determination unit
When determining the state, it further uses which range each of the received signal strengths in the wireless signal belongs to,
After determining that the state is the second state or the third state, when many of the received signal strengths in the radio signal belong to different ranges, the level of human activity existing in the space Judge that there was a change,
The state detection system according to claim 5. The transmitter and the receiver are communication systems that transmit and receive data.
The state detection system according to claim 1. A transmitter for transmitting radio waves, a receiver for receiving multipath radio signals caused by the transmitted radio waves, and an air conditioner controlled by the receiver, wherein at least the receiver and the air conditioner are An air conditioning control system arranged in a space to be air conditioned,
The receiver
Based on the variation in received signal strength in the radio signal received a plurality of times at regular intervals, a state in which no person is present in the space, and a plurality of states in which the degree of activity of the person existing in the space is different, A determination unit for determining which state is;
A control unit for controlling the air conditioner according to the state determined by the determination unit;
An air conditioning control system. A state using a system that includes a transmitter that transmits radio waves and a receiver that receives multipath radio signals caused by the transmitted radio waves, and at least the receiver is disposed in a space to be detected A detection method,
Based on variations in received signal strength in the radio signal received multiple times at regular intervals by the receiver, a plurality of states in which no person is present in the space and the activities of persons existing in the space are different. A determination step of determining which of the states is,
A state detection method comprising:

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