JPH06348989A - Mobile object sensor and monitoring device - Google Patents

Abstract

PURPOSE:To provide a mobile object sensor which can inform its own abnormal part and improves the maintenance efficiency. CONSTITUTION:A transceiver 1 radiates an ultrasonic wave W1 to a traveling course 4, receives a reflected wave W2 from the course 4, and outputs a reception signal S2. A signal deciding part 21 decides the presence or absence of a mobile object 3 based on the arriving time of the signal S2 and in each measuring cycle. Then the part 21 outputs a mobile object sensor signal S3 to show the presence or absence of the object 3. An abnormality deciding part decides the abnormality of the transceiver 1 or the part 21 based on the arriving time of the signal S2 and outputs a pseudo mobile object sensor signal S4 that shows a road surface occupying rate which is impossible by the normal signal S3 in a fixed time of an abnormal mode when the presence of the object 3 is confirmed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving body detector and a monitoring device, and more particularly, to occupying a road surface of a moving body "with" in which the moving body detector cannot normally cause an abnormality in each part of the moving body detector. The present invention relates to a technique capable of notifying an abnormal part of the user and improving maintenance efficiency by outputting as a pseudo moving object detection signal of the rate.

[0002]

2. Description of the Related Art In a conventional moving body detector, a moving body detection signal is output as a relay contact. Regarding the relay contact output, normally, in consideration of the fail-safe property, the contact that conducts when the relay is de-energized is the moving body “present”. That is,
When the moving body detector determines an abnormality, the road surface occupancy rate is 1
A moving object detection signal of 00% is output.

[0003]

However, in the conventional moving body detector, although it is possible to notify that there is an abnormality by a moving body detection signal with which the road surface occupancy rate becomes 100%, the power is cut off. It is not possible to identify whether the relay is non-energized or whether the relay is non-energized by the control signal, so it is not possible to identify the failure location of the relay, signal processing circuit, etc.
It was necessary to go to the site once to check where it was broken, and if the handset was broken, it was necessary to send it out again with a vehicle such as a tower car. Therefore, a great deal of time and effort is spent on repair.

A first object of the present invention is to solve the above-mentioned problems, to provide a moving body detector capable of notifying its own abnormal portion and improving maintenance efficiency.

A second object of the present invention is to provide a monitoring device capable of elucidating an abnormal portion of a moving body detector from a moving body detection signal and improving maintenance efficiency.

[0006]

In order to solve the above-mentioned problems, the present invention provides a moving body detection including a handset and a signal processing circuit, wherein the handset is provided above a traveling path of the moving body. Provided, radiates ultrasonic waves toward the traveling road, receives reflected waves from the traveling road side, and outputs a reception signal, the signal processing circuit, a signal determination unit, and an abnormality determination unit The signal determining unit determines the presence or absence of the moving body based on the arrival time of the received signal for each measurement cycle, outputs a moving body detection signal indicating the presence or absence of the moving body, and the abnormality determining unit receives the received signal. An abnormality of the handset or the signal determination unit is determined based on time, and the road surface occupancy rate of the moving body "present" within a certain time becomes an occupancy rate that cannot be generated by the normal moving body detection signal depending on the abnormality mode. A pseudo moving object detection signal is output.

Further, in the monitoring device including a moving body detector and a central device, the moving body detector is the one described above, and the central device moves the pseudo moving body detection signal. The abnormal mode is identified from the road occupancy of the body "present".

[0008]

[Operation] The handset is provided above the traveling path of the moving body,
It emits ultrasonic waves toward the traveling road, receives the reflected wave from the traveling road side, and outputs the received signal.The signal processing circuit moves the signal determination unit according to the arrival time of the received signal at each measurement cycle. Since the presence / absence of a body is determined and a moving body detection signal indicating the presence / absence of a moving body is output, the central device that receives the moving body detection signal passes through the moving body depending on the number of times the moving body “present” changes to the moving body “absent” The number of vehicles is known, and moving objects can be detected. Further, the road surface occupancy rate can be known from the ratio of the number of times of measuring the presence of the moving body “present” and the total number of times of measurement.

In the signal processing circuit, the abnormality judging section judges the abnormality of the handset or the signal judging section based on the arrival time of the received signal, and the road surface occupancy rate of the "present" moving body within a certain time is normal depending on the abnormal mode. Since a pseudo moving body detection signal having an occupancy rate that cannot be generated by the moving body detection signal is output, a moving body detector capable of notifying its own abnormal portion and improving maintenance efficiency can be obtained.

Since the central unit identifies the abnormal mode from the road surface occupancy ratio of the moving body "present" of the pseudo moving body detection signal,
It is possible to obtain a monitoring device that can clarify the abnormal portion of the moving body detector from the abnormality detection signal and improve the maintenance efficiency.

[0011]

1 is a block diagram showing the configuration of an embodiment of a moving body detector according to the present invention, and FIG. 2 is a time chart showing the operation of the moving body detector. In the figure, 1 is a handset and 2
Is a signal processing circuit, 3 is a moving body, and 4 is a traveling path. The moving body 3 is a vehicle.

The handset 1 is provided above the traveling path 4 of the moving body 3, emits an ultrasonic wave W1 toward the traveling path 4, receives a reflected wave W2 from the traveling path 4 side, and receives a reception signal S2. Is output.

The signal processing circuit 2 includes a signal determination section 21 and an abnormality determination section 22. The signal determination unit 21 determines the mobile unit 3 according to the arrival time Tx of the reception signal S2 for each measurement cycle T.
The presence or absence of the moving body is determined, and the moving body detection signal S3 indicating the presence or absence of the moving body is output. The measurement cycle T is set to 50 msec, for example.

The signal determination unit 21 is a transmission signal generation unit 211.
And a reception signal processing unit 212. The transmission signal generator 211 generates a transmission signal S1 at each measurement cycle T,
The transmission signal S1 is supplied to the handset 1. Received signal processing unit 2
12 is the first gate time GT1 and the second gate time GT
2 and. The first gate time GT1 is set to the time interval between the reflected wave arrival time Tr from the ground height Hr and the reflected wave arrival time Tn from the ground height Hn. Second
The gate time GT2 is set to the time interval between the reflected wave arrival time Tn from the ground height Hn and the reflected wave arrival time Th from the traveling path 4. The reception signal processing unit 212 obtains the actual reflected wave arrival time Tx from the transmission of the transmission signal S1 to the reception of the received signal S2, and when the reflected wave arrival time Tx is within the first gate time GT1, the moving body “exists”. The moving body detection signal S3 of “No” is output when the reflected wave arrival time Tx is within the second gate time GT2. The output of the moving body detection signal S3 is performed after the second gate time GT2 has elapsed, and the next measurement period T
Maintained up to 2. The abnormality determination unit 22 determines an abnormality in the handset 1 or the signal determination unit 21 based on the arrival time Tx of the received signal S2, and the moving object "existing" within a certain period of time has a normal road surface occupancy ratio depending on the abnormal mode. A pseudo moving body detection signal S4 having an occupancy that cannot be generated by the detection signal S3 is output. The road surface occupancy that cannot normally occur is, for example, 90
~ 99% occupancy.

The abnormality determining section 22 determines the third gate time GT3.
And a fourth gate time GT4. The third gate time GT3 is the arrival time T of the reflected wave from the ground height Hr after the transmission signal S1 of the measurement period T1 is transmitted (To).
The time interval is set to r. 4th gate time G
T4 is set to the time interval from the arrival time Th of the reflected wave from the traveling path 4 to the transmission (To) of the transmission signal S1 of the next measurement cycle T2. The abnormality determination unit 22 determines the abnormality of the handset 1 or the signal determination unit 21 when the reflected wave arrival time Tx is within the third gate time GT3 or within the fourth gate time GT4. Reflected wave arrival time T
When x is within the third gate time GT3, for example, 5
Pseudo moving object detection signal S4 with a road surface occupancy rate of 96%
Is output in priority to the moving body detection signal S3. Similarly,
When the reflected wave arrival time Tx is within the fourth gate time GT4, the pseudo moving object detection signal S having a road surface occupancy rate of 97% is used.
4 is output in priority to the moving body detection signal S3. The pseudo moving body detection signal S4 may be output at the same time as the abnormality determination, or may be performed after the second gate time GT2 has elapsed, like the moving body detection signal S3.

As described above, the handset 1 is provided above the traveling path 4 of the moving body 3, emits the ultrasonic wave W1 based on the transmission signal S1 toward the traveling path 4, and transmits from the traveling path 4 side. The reflected wave W2 is received and the received signal S2 is output. In the signal processing circuit 2, the signal determination unit 21 determines the presence or absence of the moving body 3 based on the arrival time Tx of the received signal S2 at each measurement cycle T, Since the moving body detection signal S3 indicating whether or not there is a moving body is output, the central device (not shown) that has received the moving body detection signal S3 knows the number of passing moving bodies based on the number of times the moving body “exists” to the moving body “absent”. It can detect moving objects. Also,
The road surface occupancy rate can be known from the ratio of the number of measurements of detecting the presence of the moving body and the total number of measurements.

In the signal processing circuit 2, the abnormality judging section 22 judges the abnormality of the handset 1 or the signal judging section 21 based on the arrival time Tx of the received signal S2, and the moving body "present" within a certain time is determined by the abnormality mode. Since the pseudo mobile object detection signal S4 whose road surface occupancy ratio is an occupancy ratio that cannot be generated by the normal mobile object detection signal S3 is output, for example, the pseudo mobile object detection signal S4 whose road surface occupancy ratio is 96% is output. Handset 1
It can be seen that there is a reflector which becomes an obstacle in the vicinity of, and when the pseudo moving object detection signal S4 having a road surface occupancy rate of 97% is output, the mounting direction of the handset 1 is deviated. Therefore, it is possible to obtain a moving body detector that can notify the abnormal portion of itself and improve the maintenance efficiency.

Further, the abnormality judging section 22 of the embodiment shown in FIG.
Pseudo moving body detection signal S4 in which the road surface occupancy ratio of the moving body “present” is determined as the number of moving body detections that cannot be detected within a certain time
Is output. For example, the road surface occupancy rate is set to 96% by detecting 240 moving bodies in 5 minutes. Therefore, the central device (not shown) samples the pseudo moving body detection signal S4 at a cycle of 50 msec, and receives the pseudo moving body detection signal S4 in which the number of detected moving bodies is 240 and the road surface occupancy rate is 96%. In this case, since it is possible to make a determination based on both the number of moving objects detected and the road surface occupancy rate, it can be reliably determined that an anomaly is present in the vicinity of the handset 1 with a reflector serving as an obstacle. Further, by determining whether or not the signal processing circuit 2 outputs the moving body detection signal S3 that detects the number of moving bodies of 240 or more, it is possible to accurately determine whether or not the signal processing circuit 2 is malfunctioning. become able to.

3 to 5 are time charts for explaining the operation of the abnormality judging section of the embodiment shown in FIG. In the figure, the same reference numerals as those in FIG. 2 indicate the same components.

FIG. 3 will be described with reference to FIG. FIG. 3 assumes a case where the handset 1 has a transmission failure while detecting the moving body 3. The handset 1 generates reverberation W11 after radiating the ultrasonic wave W1. The abnormality determination unit 22 determines that the handset 1 is abnormal when the reverberation W11 cannot be received within the third gate time GT3 after the handset 1 emits the ultrasonic wave W1. In the measurement cycle T1, the reverberation W11 is obtained within the third gate time GT3, the reception signal S2 is obtained within the first gate time GT1, and the moving body detection signal S3 of the moving body “present” is output at the time Ts1. . In the measurement cycle T2, since the handset 1 has a transmission failure, the reverberation W11 is not obtained within the third gate time GT3, and at time Ts2, the number of detected mobile units is 240 and the simulated mobile unit has a road surface occupation ratio of 96%. The detection signal S4 is output.

FIG. 4 will be described with reference to FIG. FIG. 4 assumes a case where the handset 1 has a reception failure including the propagation path of ultrasonic waves. The abnormality determination unit 22 cannot receive the reception signal S2 within the second gate time GT2, receives the reception signal S2 within the fourth gate time GT4, or cannot receive the reception signal S2 within the fourth gate time GT4. In this case, it is determined that the road surface detection is abnormal. The abnormality of the road surface detection includes, for example, a case where the mounting direction of the handset 1 is displaced and the reflected wave W2 cannot be received, a case where the reflectance of the road surface is lowered and the reflected wave W2 cannot be received, and the like. The measurement cycle T1 is the same as in FIG. In the measurement cycle T2, the third
By receiving the reverberation W11 within the gate time GT3, it is confirmed that there is no transmission failure of the handset 1. The received signal S2 is not received within the second gate time GT2,
It is determined that the failure is such that the propagation path has become longer due to the reception within the gate time GT4. Further, if the handset 1 is not received within the fourth gate time GT4, it is determined that the mounting direction of the handset 1 is misaligned and faces the extra place. At time Ts2, a pseudo moving body detection signal S4 with 180 moving body detections and 97% road surface occupancy is output.

FIG. 5 will be described with reference to FIG. FIG. 5 assumes a failure in which the moving body 3 is continuously detected. The abnormality determination unit 22 determines that the signal determination unit 21 has continuously moved for a certain period of time, for example, 30 minutes for the moving body detection signal S of the moving body “present”.
When 3 is output, it is determined that the continuous detection of the moving body 3 is abnormal. Mobile unit 3 must be 1 for a certain period of time, considering traffic congestion
The platform is set to pass. In the measurement cycle T1, the reception signal processing unit 212 detects the moving body 3 and detects the time T
The moving body detection signal S3 of the moving body "present" is continuously output to s1. In the measurement cycle T2, the reception signal processing unit 212
Detects the moving body 3. At time Ts2, when the moving body 3 is continuously detected for 30 minutes, the moving body 3
The number of moving objects detected is 120,
A pseudo moving body detection signal S4 having a road surface occupancy of 98% is output. The abnormality in continuous detection includes a case where there is an obstacle on the traveling path 4. In addition, the abnormality determination unit 22 determines that the received signal S
When 2 is also monitored together, continuous detection is performed even when the first gate time GT1 of the signal determination unit 21 shifts and overlaps with the second gate time GT2 to cause a failure such that the traveling path 4 is detected as the moving body 3. It can be judged as abnormal.

Since the abnormality determination unit 22 outputs the abnormal state as a plurality of pseudo moving body detection signals S4, the road surface occupancy rate is 1
The central device (not shown) that has received the moving body detection signal S3 of 00% can determine that the moving body detector or the power supply is abnormal.

FIG. 6 is a block diagram showing the structure of the monitoring apparatus according to the present invention. In the figure, 51 to 5n are moving body detectors, 6 is a central device, and 71 and 72 are relay devices.

The moving body detectors 51 to 5n are composed of the above-mentioned moving body detectors (see FIG. 1). Moving object detector 5
1 to 5n are transmitted to the relay devices 71 and 72 by the moving body detection signal S3
Alternatively, the pseudo moving object detection signal S4 is transmitted. The relay devices 71 and 72 transmit the mobile body detection signal S3 of the mobile body detectors 51 to 5n in response to the periodical transmission request from the central device 6. The relay devices 71 and 72 are the moving body detectors 51 to 5 respectively.
When n outputs the pseudo moving body detection signal S4, the pseudo moving body detection signal S4 is immediately transmitted to the central unit 6.
The central unit 6 identifies the abnormal mode from the occupation ratio of the moving body "present" of the pseudo moving body detection signal S4. The moving body detectors 51 to 5n can also be configured to directly transmit the pseudo moving body detection signal S4 to the central device 6 without passing through the relay devices 71 and 72.

As described above, the central unit 6 detects an abnormal mode from the occupation ratio of the moving body "present" of the pseudo moving body detection signal S4.
Since the mobile object is identified, it is possible to clarify the abnormal portion of the mobile object detectors 51 to 5n from the pseudo mobile object detection signal S4 and improve the maintenance efficiency. For example, when the pseudo moving object detection signal S4 having a road surface occupation ratio of 96% is received, the handset 1
Indicates that there is a transmission failure. Further, since it is naturally known which mobile body detector has output the pseudo mobile body detection signal S4, it is possible to easily clarify which part of which mobile body detector has a failure and improve maintenance efficiency. You can

The moving body detectors 51 to 5n determine the road surface occupancy rate as the number of moving body detections that cannot be detected within a fixed time. Therefore, the central device 6 can make a determination based on both the number of moving objects detected and the road surface occupancy rate, and can reliably determine an abnormal portion without being affected by noise or the like. When the number of moving body detection signals S3 that exceeds the set number of moving body detections is received, the signal determination unit 21 of the moving body detectors 51 to 5n.
It turns out that is broken.

[0028]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a moving body detector capable of notifying its own abnormal portion and improving maintenance efficiency. (B) It is possible to provide a monitoring device that can improve the maintenance efficiency by clarifying the abnormal portion of the moving body detector from the abnormality detection signal.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a moving body detector according to the present invention.

FIG. 2 is a time chart showing the operation of the moving body detector according to the present invention.

FIG. 3 is a time chart for explaining the operation of the abnormality determination unit when the handset has a transmission failure.

FIG. 4 is a time chart illustrating the operation of the abnormality determination unit when a reception failure including an ultrasonic wave propagation path occurs.

FIG. 5 is a time chart for explaining the operation of the abnormality determination unit when a failure that continuously detects a moving object occurs.

FIG. 6 is a block diagram showing a configuration of a monitoring device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handset 2 Signal processing circuit 21 Signal determination part 22 Abnormality determination part 3 Moving body 4 Running path 51-5n Moving body detector 6 Central apparatus W1 Ultrasonic wave (radiated wave) W2 Reflected wave S1 Sending signal S2 Received signal S3 Moving body Detection signal S4 Pseudo moving body detection signal

Claims (6)

[Claims] 1. A mobile body detector including a handset and a signal processing circuit, wherein the handset is provided above a traveling path of the moving body and emits ultrasonic waves toward the traveling path. Receiving a reflected wave from the traveling road side and outputting a reception signal, the signal processing circuit includes a signal determination unit and an abnormality determination unit, and the signal determination unit receives the reception signal at each measurement cycle. The presence or absence of the moving body is determined by the arrival time of a signal, a moving body detection signal indicating the presence or absence of the moving body is output, and the abnormality determination unit determines whether the handset or the signal determination unit is abnormal based on the arrival time of the received signal. A moving body detector that determines and outputs a pseudo moving body detection signal in which the road surface occupancy rate of the moving body "present" within a certain period of time is an occupancy rate that cannot be generated by the normal moving body detection signal depending on the abnormal mode. 2. The pseudo abnormality detection signal, wherein the abnormality determination unit outputs the pseudo moving object detection signal that defines a road surface occupancy rate of the moving object “present” as the number of moving objects that cannot be detected within a fixed time. Mobile detector. 3. The moving body detector according to claim 1, wherein the abnormality determination unit determines that the handset is abnormal when the handset cannot receive reverberation after emitting the ultrasonic wave. 4. The moving body detector according to claim 1, wherein the abnormality determination unit determines that the road surface detection is abnormal when the reception signal cannot be received within the arrival time of the reflected wave from the traveling road surface. 5. The abnormality detection unit according to claim 1 or 2, wherein when the signal determination unit outputs a moving object detection signal of a moving object “present” continuously for a certain period of time, it is determined as continuous detection abnormality. Mobile detector. 6. A monitoring device including a moving body detector and a central device, wherein the moving body detector is any one of claims 1 to 5, wherein the central device is the pseudo device. A monitoring device for identifying the abnormal mode from the road surface occupancy ratio of the mobile body "present" of the mobile body detection signal.