JP2021140681A - Human sensor - Google Patents

Abstract

To provide a human sensor capable of reducing workload of radio wave examination and radio performance test at the time of installation of the human sensor.SOLUTION: A human sensor 1 that wirelessly transmits a detection signal at a transmission timing at a constant cycle ΔT1. When it has detected a human within the constant cycle ΔT1 just before a transmission timing, the human sensor 1 wirelessly transmits an ON signal indicating detection of a human and after that, continuously transmits the ON signal indicating the detection of a human wirelessly at a transmission timing within a dead time ΔT2 longer than the constant cycle ΔT1 from a time point t06 when the human was detected. When the transmission timing is not within the dead time ΔT2 and no human is detected the immediately preceding constant cycle ΔT1, the human sensor 1 wirelessly transmits an OFF signal indicating non-detection of a human.SELECTED DRAWING: Figure 2

Description

The present invention relates to a motion sensor that can reduce the work load of a radio wave survey and a radio performance test when the motion sensor is installed.

With the progress of IoT technology, the spread of IoT wireless sensors is increasing, and the use of IoT wireless sensors in buildings is also increasing. Types of IoT wireless sensors include, for example, a temperature sensor that wirelessly transmits detection data at regular time intervals, a vibration sensor that wirelessly transmits a detection signal when vibration is detected, and a detection signal when door opening / closing is detected. There are door open / close sensors that transmit wirelessly, and human sensor that wirelessly transmits detection signals when a person is detected.

Of these, motion sensors have often been used to turn on and off the lights in toilet booths, but with the shift to wireless motion sensors, the purpose is to determine the presence or absence of people in a relatively large conference room. However, it has come to be used (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2019-40282

When the above IoT wireless sensor is installed in a building or the like, in order to effectively detect the radio waves of a plurality of IoT wireless sensors, it is necessary to conduct a radio wave survey and a wireless performance test at the time of sensor installation. Here, in a general motion sensor, when an installation worker tries to operate the motion sensor, the detection signal may not be wirelessly transmitted at an intended timing. This is because the motion sensor provides a period of insensitivity (hereinafter referred to as an insensitivity period) in which once a person is detected, it is not re-detected for a certain period of time, and on the other hand, during a predetermined cycle. This is because it has two radio wave transmission patterns peculiar to the motion sensor, that is, when a person is not detected, the sensor alive monitoring signal is transmitted wirelessly.

Therefore, when a conventional motion sensor is installed, there is a problem that the radio wave survey and the radio performance test at the time of installing the sensor become complicated and the work takes time.

The present invention has been made in view of the above, and an object of the present invention is to provide a motion sensor capable of reducing the work load of a radio wave survey and a radio performance test at the time of installing a motion sensor.

In order to solve the above-mentioned problems and achieve the object, the present invention is a motion sensor that wirelessly transmits a detection signal at a fixed cycle transmission timing, and detects a person within a fixed cycle immediately before the transmission timing. If this is the case, the detection signal indicating the detection of a person is wirelessly transmitted, and then the detection signal indicating the detection of a person is performed at the transmission timing within a certain period longer than the certain period from the time when the person is detected. Is wirelessly transmitted, and when the transmission timing is not within the fixed period and no person is detected within the immediately preceding fixed cycle, a non-detection signal indicating no human detection is wirelessly transmitted.

Further, in the above invention, the fixed period may be a dead period in which the detection state of a person is maintained from the time of the detection of the person regardless of the presence or absence of the detection of the person.

Further, the present invention wirelessly transmits a first detection signal indicating the detection of a person at the time of detecting the person, and from the time of the detection of the person to the dead period during which the detection state of the person is maintained. Regardless of the presence or absence of detection, when a person is detected during a period other than the dead period without transmitting the detection signal, the first detection signal indicating the detection of the person is wirelessly transmitted and the processing of the dead period is performed. Repeatedly, when a person is not detected during a period other than the dead period and a waiting period after the end of the dead period, a first non-detection signal indicating no human detection is transmitted at the transmission timing of the first fixed cycle. When the reference human sensor to be transmitted and the first detection signal indicating the detection of a person are received from the reference human sensor within the second fixed cycle immediately before the transmission timing of the second fixed cycle, the first detection signal is received. The detection signal of 1 is wirelessly transmitted as a second detection signal indicating the detection of a person, and after that, the detection signal is longer than the second fixed period, and is said to be within the dead period from the time of receiving the first detection signal. The second detection signal indicating the detection of a person is continuously transmitted wirelessly at the transmission timing of the second fixed cycle, and the transmission timing of the second fixed cycle is not within the dead period and is immediately before the second. When the first detection signal indicating the detection of a person is not received within a certain period of time, the signal conversion device for wirelessly transmitting the second non-detection signal indicating the non-detection of a person is provided.

According to the present invention, it is possible to reduce the work load of the radio wave survey and the radio performance test at the time of installing the motion sensor.

FIG. 1 is a block diagram showing a configuration of a motion sensor according to an embodiment of the present invention. FIG. 2 is a time chart showing an example of transmission processing of a detection signal by a motion sensor and a conventional motion sensor. FIG. 3 is a flowchart showing a procedure for transmitting a detection signal by the control unit shown in FIG. FIG. 4 is a block diagram showing a configuration of a motion sensor of a modified example.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a configuration of a motion sensor 1 according to an embodiment of the present invention. As shown in FIG. 1, the motion sensor 1 includes an infrared detection unit 2, a storage unit 3, a transmission unit 4, and a control unit 5. The infrared detection unit 2 is an infrared sensor or an infrared camera that detects infrared rays in a predetermined monitoring area. The storage unit 3 is a storage device such as a non-volatile memory for recording various information, and stores a fixed period ΔT1 and a dead period ΔT2. The transmission unit 4 is a communication device that wirelessly transmits to the outside, and is, for example, a communication device that performs short-range wireless communication such as WiFi (registered trademark).

The control unit 5 is a control unit that controls the entire motion sensor 1, and includes a human detection unit 6 and a transmission processing unit 7. The person detection unit 6 detects the presence of a person by detecting a state change in the infrared detection unit 2. The transmission processing unit 7 instructs the motion sensor 1 to continue transmitting either the OFF signal or the ON signal while always maintaining the transmission pitch of ΔT1 at regular intervals.

The contents of instructions given by the transmission processing unit 7 will be described step by step. After the power of the motion sensor 1 is turned on, the motion sensor 1 continues to transmit an OFF signal at a transmission pitch of ΔT1 at regular intervals at a stage where a person has not been detected yet (time points t00 to t05 in FIG. 2). When the person detection unit 6 detects a person within the fixed cycle ΔT1 immediately before the transmission timing of the fixed cycle ΔT1 (time point t06), the transmission processing unit 7 transmits an ON signal which is a detection signal indicating the detection of the person. Wirelessly transmit from. After that, the transmission processing unit 7 continues to wirelessly transmit the ON signal indicating the detection of the person at the transmission timing within the dead period ΔT2, which is a fixed period longer than the fixed period ΔT1, from the time of detecting the person when the person is detected (time point t07). ~ T09), when the transmission timing is not within the dead period ΔT2 and no person is detected within the immediately preceding fixed period ΔT1, the OFF signal, which is a detection signal (non-detection signal) indicating no human detection, is wirelessly transmitted. Send (time point t10 or later). When a person is detected at a time point after the dead period ΔT2 (after the time point t09), the state returns to the state at the time point t06 and the ON signal is transmitted at the next transmission timing (time point t07).

As a result, the motion sensor 1 always transmits a detection signal of either an ON signal or an OFF signal at a transmission interval of a fixed period ΔT1.

<Example of detection signal transmission processing>
FIG. 2 is a time chart showing an example of transmission processing of a detection signal by the motion sensor 1 and the conventional motion sensor. As shown in FIG. 2B, for example, the conventional motion sensor wirelessly transmits an ON signal indicating the detection of a person at the time t06 when the person is detected, and maintains the detection state of the person from the time t06. During the dead period ΔT2, the detection signal is not transmitted regardless of the presence or absence of human detection, and when a person is detected during a period other than the dead period ΔT2, an ON signal indicating human detection is wirelessly transmitted, and the time point t06 When a person is not detected during a period other than the dead period ΔT2 and a waiting period ΔT20 after the end of the dead period ΔT2 (time point t09) by repeating the transmission process from, that is, the process of the dead period ΔT2, the constant cycle ΔT10 An OFF signal indicating no human detection at the transmission timing is transmitted as a detection signal (no detection signal).

That is, when the conventional motion sensor detects a person at the time point t06, it transmits an ON signal at the time point t06, and then, during the dead period ΔT2, it does not transmit a detection signal at all and turns ON even when the person is detected. Do not send a signal. In the waiting period ΔT20 after the dead period ΔT2, the detection signal is not transmitted, but when a person is detected, the ON signal is transmitted, and then the state returns to the state at the time point t06, and the process shifts to the dead period ΔT2 and the waiting period ΔT20. .. The same process is repeated for the transmission process from the time point t06. In FIG. 2B, since no person was detected within the waiting period ΔT20, no detection signal was transmitted. If no person is detected after the end of the waiting period ΔT20 (time point t12), the OFF signal is transmitted at the transmission timing of the fixed cycle ΔT10 (time point t12, t14). This OFF signal functions as a sensor alive monitoring signal. This is because if the dead period ΔT2 is not provided, the ON signal is frequently transmitted, the information on the device side that receives the detection signal is concentrated, and the stability of operation may be impaired. Further, the standby period ΔT20 is also a margin period for providing operational stability (chattering prevention) on the device side using the detection signal, and is also a signal for confirming the survival state of the sensor.

Therefore, the conventional motion sensor does not transmit a detection signal at all during the dead period ΔT2 even at the transmission timing, and if there is no human detection in the standby period ΔT20 following the dead period ΔT2, the time point t06 is reached. , The detection signal is not transmitted at all until the end time t12 of the waiting period ΔT20.

On the other hand, since the motion sensor 1 always transmits signals at regular intervals, the processing of the device on the side receiving the detection signal is simple, and it is easy to check the state of the wireless signal. As shown in FIG. 2A, the ON signal is transmitted at the time points t07 and t08 of the transmission timing of the constant period ΔT1 from the time point t06 when the person is detected to the time point t09 at the end of the dead period ΔT2. At other transmission timings, an OFF signal is transmitted. That is, the motion sensor 1 always transmits the detection signal of the ON signal or the OFF signal at the transmission timing of the fixed cycle ΔT1.

<Detection signal transmission processing>
FIG. 3 is a flowchart showing a procedure for transmitting a detection signal by the control unit 5. As shown in FIG. 3, first, the control unit 5 determines whether or not the transmission timing is for each fixed period ΔT1 (step S110). If it is not the transmission timing (step S110: No), the determination process of step S110 is repeated.

When it is the transmission timing (step S110: Yes), it is determined whether or not a person is detected within the immediately preceding fixed period ΔT1 (step S120). When a person is detected (step S120: Yes), an ON signal is transmitted at this transmission timing (step S130), and this process ends.

On the other hand, when no person is detected within the immediately preceding fixed period ΔT1 (step S120: No), it is further determined whether or not this transmission timing is continuing the dead period ΔT2 (step S140). If the transmission timing is the continuation of the dead period ΔT2 (step S140: Yes), the ON signal is transmitted (step S150), and this process ends.

On the other hand, when the transmission timing is not the continuation of the dead period ΔT2 (step S140: No), the OFF signal is transmitted (step S160), and this process is terminated.

<Modification example>
FIG. 4 is a block diagram showing the configuration of the motion sensor 30 of the modified example. In this modification, the detection signal transmitted by the reference motion sensor, which is a conventional motion sensor, is received, converted into the same detection signal as the motion sensor 1, and transmitted.

As shown in FIG. 4, the motion sensor 30 includes a reference motion sensor 20 and a signal conversion device 10. The reference motion sensor 20 is a conventional motion sensor that performs the operation shown in FIG. 2 (b). Therefore, the transmission processing unit 27 performs the transmission processing shown in FIG. 2 (b). Therefore, the storage unit 3 newly stores the waiting period ΔT20. Here, the reference motion sensor 20 immediately transmits an ON signal at t06 when a person is detected.

The signal conversion device 10 includes a receiving unit 12, a storage unit 13, a transmitting unit 14, and a control unit 15. The receiving unit 12 receives the detection signal transmitted by the reference motion sensor 20. The control unit 15 has a transmission processing unit 17. The transmission processing unit 17 replaces the time when the ON signal is received among the detection signals received by the reception unit 12 with the time when a person is detected, performs the same processing as the transmission processing unit 7 of the motion sensor 1, and transmits. The detection signal is always transmitted from the unit 14 at the transmission timing of the constant cycle ΔT1. The storage unit 13 stores the fixed period ΔT1 and the insensitivity period ΔT2, similarly to the storage unit 3 of the motion sensor 1. As the detection signal transmitted from the motion sensor 30, the same detection signal as that of the motion sensor 1 is transmitted.

The constant cycle ΔT1 of the above-described embodiment and modification is, for example, 60 seconds, the dead period ΔT2 is, for example, 200 seconds, and the constant cycle ΔT1 and the dead period ΔT2 are variable set values.

According to the configuration of the present embodiment and the modified example, the detection signal is always transmitted at each transmission timing of the fixed cycle ΔT1 and the ON signal is continuously transmitted at the transmission timing during the dead period ΔT2. It is possible to reduce the workload of radio wave surveys and radio performance tests at the time of installation.

In the above-described embodiment and modification, since the detection signal is transmitted at a fixed time interval having a constant cycle ΔT1, the detection signal can be accumulated as time-series data at a fixed time interval, and the subsequent human feeling. The data analysis of the sensor becomes easy.

Further, in the above-described embodiment and modification, the infrared detection unit 2 is used to detect a person, but the present invention is not limited to this, and any sensor capable of detecting a person may be used, and other light may be used. A sensor, a sound sensor, or the like may be used.

It should be noted that each configuration shown in the above-described embodiment and modification is a schematic function, and does not necessarily have to be physically shown. That is, the form of distribution / integration of each device and component is not limited to the one shown in the figure, and all or part of the device and components are functionally or physically distributed / integrated in arbitrary units according to various usage conditions. Can be configured.

1,30 Motion sensor 2 Infrared detector 3,13 Storage unit 4,14 Transmitter 5,15 Control unit 6 Human detector 7,17,27 Transmission processing unit 10 Signal converter 12 Receiver 20 Reference motion sensor t00 ~ T15 time point ΔT1, ΔT10 constant cycle ΔT2 insensitivity period ΔT20 waiting period

Claims (3)

It is a motion sensor that wirelessly transmits a detection signal at a fixed cycle transmission timing.
When a person is detected within a certain period immediately before the transmission timing, the detection signal indicating the detection of the person is wirelessly transmitted, and thereafter, within a certain period longer than the certain period from the time when the person is detected. When the detection signal indicating the detection of a person is continuously transmitted wirelessly at the transmission timing of the above, and the transmission timing is not within the fixed period and the person is not detected within the immediately preceding fixed cycle, there is no human. A motion sensor that wirelessly transmits an undetected signal indicating detection. The motion sensor according to claim 1, wherein the fixed period is a dead period in which the detection state of the person is maintained regardless of the presence or absence of the detection of the person from the time of the detection of the person. At the time of detecting a person, the first detection signal indicating the detection of the person is wirelessly transmitted, and from the time of the detection of the person to the dead period during which the detection state of the person is maintained, regardless of the presence or absence of the detection of the person. When a person is detected during a period other than the dead period without transmitting the detection signal, the first detection signal indicating the detection of the person is wirelessly transmitted and the processing of the dead period is repeated, except for the dead period. And, when a person is not detected during a period other than the waiting period after the end of the dead period, a reference human sensor that transmits a first non-detection signal indicating no human detection at the transmission timing of the first fixed cycle. When,
When the first detection signal indicating the detection of a person is received from the reference motion sensor within the second fixed cycle immediately before the transmission timing of the second fixed cycle, the first detection signal is detected by the person. Is transmitted wirelessly as the second detection signal indicating the above, and thereafter, the transmission timing of the second fixed cycle within the dead period from the time of receiving the first detection signal, which is longer than the second fixed cycle. The second detection signal indicating the detection of a person is continuously transmitted wirelessly, and the transmission timing of the second fixed cycle is not within the dead period, and the detection of the person is performed within the immediately preceding second fixed cycle. A signal conversion device that wirelessly transmits a second non-detection signal indicating no human detection when the first detection signal indicating the above is not received.
A motion sensor equipped with.

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