JP7374823B2 - Human sensor - Google Patents

Description

The present invention relates to a human sensor that can reduce the workload of radio wave surveys and wireless performance tests when installing the human sensor.

With the progress of IoT technology, IoT wireless sensors are becoming more widespread, and the use of IoT wireless sensors in buildings is also progressing. Types of IoT wireless sensors include, for example, a temperature sensor that wirelessly transmits detection data at fixed time intervals, a vibration sensor that wirelessly transmits a detection signal when it detects vibration, and a sensor that transmits a detection signal when it detects the opening and closing of a door. There are door opening/closing sensors that transmit wirelessly, and motion sensors that wirelessly transmit a detection signal when a person is detected.

Of these, motion sensors have traditionally been used to turn on and off lights in restroom booths, but as motion sensors have become wireless, they have been used to detect the presence or absence of people in relatively large conference rooms. It has also come to be used in Japan (see Patent Document 1).

JP 2019-40282 Publication

When installing the above-mentioned IoT wireless sensor inside a building or the like, in order to effectively detect the radio waves of multiple IoT wireless sensors, it is necessary to conduct a wireless radio wave survey and a wireless performance test at the time of sensor installation. Here, when an installation worker tries to operate the human sensor, a general human sensor may not be able to wirelessly transmit a detection signal at the intended timing. This is because once a human sensor detects a person, it has a period of insensitivity (hereinafter referred to as "dead period") in which it does not detect a person again for a certain period of time, and on the other hand, during a predetermined period, This is because the sensor has two radio wave transmission patterns unique to human sensors: when it does not detect a person, it wirelessly transmits a sensor life/death monitoring signal.

Therefore, when installing a conventional human sensor, there is a problem that radio wave surveys and wireless performance tests at the time of sensor installation are complicated and the work is time-consuming.

The present invention has been made in view of the above, and an object of the present invention is to provide a human sensor that can reduce the workload of radio wave surveys and wireless performance tests when installing the human sensor.

In order to solve the above-mentioned problems and achieve the objects, the present invention provides a human sensor that wirelessly transmits a detection signal at a fixed periodic transmission timing, and which detects a person within a certain period immediately before the transmission timing. In this case, the detection signal indicating the detection of a person is wirelessly transmitted, and the detection signal indicating the detection of the person is then transmitted at the transmission timing within a certain period longer than the certain period from the time of detecting the person when the person is detected. continues to be wirelessly transmitted, and if the transmission timing is not within the predetermined period and no person has been detected within the immediately preceding predetermined period, a non-detection signal indicating that no person has been detected is wirelessly transmitted.

Moreover, in the present invention, in the above-mentioned invention, the certain period may be a dead period during which the human detection state is maintained from the point of time when the human is detected, regardless of whether or not the human is detected.

Further, the present invention wirelessly transmits a first detection signal indicating the detection of a person at the time when a person is detected, and during a dead period during which the human detection state is maintained from the time when the person is detected. Regardless of the presence or absence of detection, if a person is detected during a period other than the dead period without transmitting a detection signal, wirelessly transmits the first detection signal indicating the detection of a person and processes the dead period. Repeatedly, when a person is not detected during a period other than the dead period and a standby period after the end of the dead period, a first non-detection signal indicating that a person is not detected is sent at a first fixed cycle transmission timing. When a first detection signal indicating the detection of a person is received from the reference human sensor within the second fixed period immediately before the transmission timing of the second fixed period, the first detection signal is transmitted from the reference human sensor. The first detection signal is wirelessly transmitted as a second detection signal indicating the detection of a person, and thereafter, the second detection signal is transmitted over the air within the dead period from the time of reception of the first detection signal, which is longer than the second fixed period. The second detection signal indicating the detection of a person continues to be wirelessly transmitted at the transmission timing of a second fixed period, and the transmission timing of the second fixed period is not within the dead period and the second detection signal immediately before the second detection signal is transmitted. a signal conversion device that wirelessly transmits a second non-detection signal indicating that no person is detected when the first detection signal indicating that a person is not detected within a certain period of .

According to the present invention, it is possible to reduce the workload of radio wave survey and wireless performance test when installing a human sensor.

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

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

FIG. 1 is a block diagram showing the configuration of a human sensor 1 according to an embodiment of the present invention. As shown in FIG. 1, the human sensor 1 includes an infrared detection section 2, a storage section 3, a transmission section 4, and a control section 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 that records various information, and stores a constant period ΔT1 and a dead period ΔT2. The transmitter 4 is a communication device that performs wireless transmission to the outside, and is, for example, a communication device that performs short-range wireless communication such as WiFi (registered trademark).

The control section 5 is a control section that controls the entire human sensor 1, and includes a human detection section 6 and a transmission processing section 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 human sensor 1 to continue transmitting either an OFF signal or an ON signal while always maintaining a transmission pitch of a constant interval ΔT1.

The contents of the instructions in the transmission processing section 7 will be explained step by step. After the human sensor 1 is powered on, at a stage where no person is detected yet, the human sensor 1 continues to transmit the OFF signal at a transmission pitch of a fixed interval ΔT1 (times t00 to t05 in FIG. 2). When the human detection unit 6 detects a person within a certain period ΔT1 immediately before the transmission timing of the certain period ΔT1 (time t06), the transmission processing unit 7 transmits an ON signal, which is a detection signal indicating the detection of a person, to the transmitting unit 4. Transmit wirelessly from Thereafter, the transmission processing unit 7 continues to wirelessly transmit an ON signal indicating the detection of a person at a transmission timing within a dead period ΔT2, which is a fixed period longer than the fixed period ΔT1, from the time when a person is detected (time t07). ~t09), if the transmission timing is not within the dead period ΔT2 and no person is detected within the immediately preceding constant period ΔT1, an OFF signal that is a detection signal (non-detection signal) indicating that no person is detected is sent wirelessly. Transmit (after time t10). If a person is detected after the dead period ΔT2 (after time t09), the state returns to time t06 and an ON signal is transmitted at the next transmission timing (time t07).

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

<Example of detection signal transmission process>
FIG. 2 is a time chart showing an example of a detection signal transmission process by the human sensor 1 and the conventional human sensor. As shown in FIG. 2(b), the conventional human sensor wirelessly transmits an ON signal indicating human detection at time t06 when a human is detected, and maintains the human detection state from time t06. During the dead period ΔT2, no detection signal is transmitted regardless of whether or not a person is detected, and when a person is detected during a period other than the dead period ΔT2, an ON signal indicating the detection of a person is wirelessly transmitted, and at time t06. If the transmission processing from , that is, the processing during the dead period ΔT2 is repeated, and no person is detected during the period other than the dead period ΔT2 and the waiting period ΔT20 after the end of the dead period ΔT2 (time t09), the fixed period ΔT10 is repeated. At the transmission timing, an OFF signal indicating that no person is detected is transmitted as a detection signal (non-detection signal).

That is, when the conventional human sensor detects a person at time t06, it transmits an ON signal at time t06, and thereafter does not transmit any detection signal during the dead period ΔT2, and remains ON even when it detects a person. No signal sent. During the waiting period ΔT20 after the dead period ΔT2, no detection signal is transmitted, but if a person is detected, an ON signal is transmitted, and then the state returns to time t06, and the transition to the dead period ΔT2 and the waiting period ΔT20. . The same transmission process from time t06 is repeated. In FIG. 2(b), since no person was detected within the waiting period ΔT20, no detection signal was transmitted. After the end of this waiting period ΔT20 (time t12), if no person is detected, an OFF signal is transmitted at a transmission timing of a constant period ΔT10 (times t12, t14). This OFF signal functions as a sensor life/death monitoring signal. This is because if the dead period ΔT2 is not provided, ON signals will be transmitted frequently, information on the device receiving the detection signal will be concentrated, and the stability of operation may be impaired. Further, the standby period ΔT20 is also a margin period for ensuring 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 human sensor does not transmit any detection signal even at the transmission timing during the dead period ΔT2, and if there is no detection of a person during the waiting period ΔT20 following the dead period ΔT2, from time t06 , no detection signal is transmitted until time t12 when the waiting period ΔT20 ends.

On the other hand, since the human sensor 1 always transmits signals at regular intervals, the processing of the device on the side receiving the detection signal is simple, and the state of the wireless signal can be easily confirmed. As shown in FIG. 2(a), the ON signal is transmitted at times t07 and t08 of the transmission timing of a constant period ΔT1 from the time t06 when a person is detected to the time t09 at the end of the dead period ΔT2, At other transmission timings, an OFF signal is transmitted. That is, the human sensor 1 always transmits a detection signal of an ON signal or an OFF signal at the transmission timing of the constant period ΔT1.

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

If it is the transmission timing (step S110: Yes), it is determined whether a person has been detected within the immediately preceding constant period ΔT1 (step S120). If a person is detected (step S120: Yes), an ON signal is transmitted at this transmission timing (step S130), and the present process ends.

On the other hand, if no person has been detected within the immediately preceding constant period ΔT1 (step S120: No), it is further determined whether this transmission timing is during the dead period ΔT2 (step S140). If the transmission timing is during the dead period ΔT2 (step S140: Yes), an ON signal is transmitted (step S150), and this process ends.

On the other hand, if the transmission timing is not during the dead period ΔT2 (step S140: No), an OFF signal is transmitted (step S160), and this process ends.

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

As shown in FIG. 4, the human sensor 30 includes a reference human sensor 20 and a signal converter 10. The reference human sensor 20 is a conventional human sensor that operates as 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 a waiting period ΔT20. Here, the reference human sensor 20 immediately transmits an ON signal at time t06 when a person is detected.

The signal conversion device 10 includes a receiving section 12, a storage section 13, a transmitting section 14, and a control section 15. The receiving unit 12 receives the detection signal transmitted by the reference human sensor 20. The control section 15 includes a transmission processing section 17. The transmission processing unit 17 replaces the time point at which the ON signal is received among the detection signals received by the reception unit 12 with the time point at which a person is detected, performs the same process as the transmission processing unit 7 of the human sensor 1, and transmits the signal. The detection signal is always transmitted from the unit 14 at a transmission timing of a constant period ΔT1. Note that, like the storage unit 3 of the human sensor 1, the storage unit 13 stores a constant period ΔT1 and a dead period ΔT2. The detection signal transmitted from this human sensor 30 is the same detection signal as the human sensor 1.

In addition, the fixed period ΔT1 of the above-mentioned embodiment and modification is, for example, 60 seconds, and the dead period ΔT2 is, for example, 200 seconds, and these fixed period ΔT1 and dead period ΔT2 are variable setting values.

According to the configuration of the present embodiment and the modified example, a detection signal is always transmitted at every transmission timing of the fixed period ΔT1, and an 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 wireless performance tests during installation.

In addition, in the above-described embodiments and modified examples, since the detection signal is transmitted at a constant time interval with a constant period ΔT1, the detection signal can be accumulated as time series data at constant time intervals, and the subsequent human sensation can be stored as time series data. Sensor data analysis becomes easier.

In addition, in the above embodiments and modifications, the infrared detection unit 2 is used to detect a person, but the sensor is not limited to this, and any sensor that can detect a person may be used, and other A sensor, a sound sensor, etc. may also be used.

Note that each of the configurations illustrated in the above-described embodiments and modifications is functionally schematic, and does not necessarily need to physically have the configuration shown in the figures. In other words, the form of dispersion/integration of each device and component is not limited to the one shown in the diagram, but all or part of it may be functionally or physically dispersed/integrated in arbitrary units depending on various usage conditions. It can be configured as follows.

1, 30 Human sensor 2 Infrared detection section 3, 13 Storage section 4, 14 Transmission section 5, 15 Control section 6 Human detection section 7, 17, 27 Transmission processing section 10 Signal conversion device 12 Receiving section 20 Reference human sensor t00 ~t15 Time ΔT1, ΔT10 Constant cycle ΔT2 Dead period ΔT20 Waiting period

Claims (3)

A human sensor that wirelessly transmits a detection signal at a fixed periodic transmission timing,
If a person is detected within a certain period immediately before the transmission timing, the detection signal indicating the detection of a person is wirelessly transmitted, and thereafter, within a certain period longer than the certain period from the time when the person was detected. continues to wirelessly transmit the detection signal indicating the detection of a person at the transmission timing of A human sensor that wirelessly transmits a non-detection signal indicating detection. 2. The human sensor according to claim 1, wherein the certain period is a dead period during which a human detection state is maintained from the time of human detection, regardless of whether a human is detected. At the time when a person is detected, a first detection signal indicating the detection of a person is wirelessly transmitted, and from the time when the person is detected, during a dead period during which the person detection state is maintained, regardless of whether or not a person is detected. , if a person is detected during a period other than the dead period without transmitting a detection signal, wirelessly transmits the first detection signal indicating the detection of a person and repeats the processing during the dead period; , and a reference human sensor that transmits a first non-detection signal indicating non-detection of a person at a transmission timing of a first fixed period when a person is not detected during a period other than a standby period after the end of the dead period. and,
When a first detection signal indicating the detection of a person is received from the reference human sensor within the second fixed period immediately before the transmission timing of the second fixed period, the first detection signal is detected as a human detection signal. wirelessly transmitted as a second detection signal indicating , and thereafter transmitting the second fixed period at a transmission timing longer than the second fixed period and within the dead period from the time of reception of the first detection signal. continues to wirelessly transmit the second detection signal indicating the detection of a person, and the transmission timing of the second fixed period is not within the dead period, and the person is detected within the immediately preceding second fixed period. a signal conversion device that wirelessly transmits a second non-detection signal indicating that a person is not detected when the first detection signal indicating that a person is not detected;
A human sensor equipped with a

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