JP2001307283A - Road monitoring unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wrong information that it is abnormal though actually not abnormal from coming up, even though there is omission of detection and misdetection of a sensor. SOLUTION: This invention is provided with sensors (1,..., m-1, m, m+1, m+2,..., n) which are set up seriately on a road and detect vehicles, an abnormality judgment means 10 which judges the abnormality of a vehicle comparing the measurement value between the sensor m-1 and m+1, the abnormality judgment means 20 which judges the abnormality of the vehicle comparing the measurement value between the sensor m and m+1 and the integrated judgment means 30 which judges presence of the vehicle which runs on the road between the sensors m and m+2 based on the results of the abnormality judgment means 10 and 20. As the result, misreport occurring of being abnormal though abnormality does not exist can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road monitoring device capable of reducing the influence of erroneous detection of a sensor installed on a road.

[0002]

2. Description of the Related Art A conventional road monitoring apparatus will be described with reference to the drawings. FIG. 4 is a diagram showing a configuration of a conventional road monitoring device.

As shown in FIG. 4, a group of sensors (1, 2,..., M, m + 1,.
In (1) and (n), when monitoring the abnormality of the vehicle traveling on the road, the abnormality can be detected by comparing the measurement values such as the number of vehicles and the speed between the sensors.

[0004] For example, when a vehicle at a speed v is measured by a sensor m at a time t, an adjacent sensor m + 1 outputs a signal at a time t +
A vehicle with speed v + Δv at Δt should be measured.

By evaluating the time Δt and the speed Δv, an area between the sensor m and the sensor m + 1, that is, the area m
An abnormality at _m + 1 can be detected.

[0006]

In the conventional road monitoring apparatus as described above, if there is an erroneous detection or omission in detection of a sensor based on noise or the like, an erroneous report will be issued that it is not abnormal but abnormal. There was a problem.

For example, in FIG. 4, when it is erroneously detected that a vehicle having a speed v is measured due to noise or the like even though the vehicle does not pass by the sensor m, the adjacent sensor m + 1 measures the vehicle. However, as a result, there is a problem that the vehicle is present at the sensor m and the vehicle is absent at the sensor m + 1, and it is determined that there is an abnormality between the sensors, that is, in the area m_m + 1.

If there is a detection omission at the sensor m + 1, the vehicle is present at the sensor m and the vehicle is absent at the sensor m + 1.
There is a problem that it is determined that there is an abnormality at m + 1.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a road monitoring apparatus capable of preventing erroneous detection due to erroneous detection of a sensor and omission of detection.

[0010]

A road monitoring apparatus according to a first aspect of the present invention includes first, second, third, and fourth sensors installed continuously on a road to detect a vehicle; First
A first abnormality determining means for comparing the measured values between the third and third sensors to determine the abnormality of the vehicle; and a first abnormality determining means for comparing the measured values between the second and fourth sensors to determine the abnormality of the vehicle. A second abnormality determining means, and a total determining means for determining whether there is an abnormality in a vehicle traveling on a road between the second and third sensors based on the determination results of the first and second abnormality determining means. It is provided with.

According to a second aspect of the present invention, in the road monitoring device, the first, second, third, and fourth sensors are ultrasonic sensors, and measure the passage of a vehicle immediately below the sensors. .

According to a third aspect of the present invention, in the road monitoring device, the first, second, third, and fourth sensors are image sensors, and determine the presence or absence and speed of a vehicle passing through a predetermined screen. It is to measure.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A road monitoring device according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a road monitoring device according to Embodiment 1 of the present invention. In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, reference numeral 10 denotes, for example, between adjacent sensors, which are installed on a road in a tunnel and are spaced apart from each other;
Abnormality determining means 20 for comparing the measured values between the sensor m-1 and the sensor m + 1 to determine the abnormality, for example, between 20 adjacent sensors installed on the road in the tunnel,
Abnormality determination means for comparing the measured values between the sensor m and the sensor m + 2 to determine an abnormality;
This is a comprehensive determination means for comprehensively evaluating the comparison results of 0 and 20. The above-described abnormality determination units 10 and 20 and the overall determination unit 30 are, for example, software that operates on a workstation installed in an electric room in a tunnel.

Next, the operation of the road monitoring apparatus according to the first embodiment will be described with reference to the drawings.

As shown in FIG. 1, the abnormality judging means 10
Sensor m-1 and sensor m between adjacent sensors separated by one
The measured values are compared between +1 and the result is output.

The abnormality determining means 20 compares the measured values between the adjacent sensors which are separated by one, and between the sensor m and the sensor m + 2, and outputs the result.

The comprehensive determination means 30 comprehensively evaluates the two comparison results and detects an abnormality between adjacent sensors included in both of the two sensors and an abnormality between the sensor m and the sensor m + 1.

For example, if an erroneous detection is detected by the sensor m,
An abnormality is detected by the abnormality determining means 20 between the sensor m and the sensor m + 2, that is, in the area m_m + 2, whereas, between the sensor m-1 and the sensor m + 1, that is, the area m-1_m
At +1, no abnormality is detected by the abnormality determination means 10.

The judgment result of area m_m + 2 and area m−
The determination result of 1_m + 1 is comprehensively evaluated by the comprehensive determination means 30, and the area between the sensor m and the sensor m + 1, that is, the area m_m
By detecting the +1 abnormality, the influence of erroneous detection by the sensor m can be reduced.

FIG. 2 shows a group of sensors (1,..., M−1,
m, m + 1, m + 2,..., n) show a road monitoring device using an ultrasonic sensor.

The ultrasonic sensors (1,..., M-1, m,
m + 1, m + 2,..., n) can measure the passage of the vehicle immediately below the sensor. Therefore, the comparison of the measured values between the sensors can be performed using the presence or absence of the passage.

For example, in FIG. 2, the area m_m + 2
In the case of the comparison, when the passage of the vehicle is measured by the sensor m and when the passage of the vehicle is not measured by the sensor m + 2 within a predetermined time, it can be determined that there is an abnormality.

Similarly, the determination of the area m-1_m + 1 is performed, and a comprehensive determination is performed based on the determination results of both areas, and the presence or absence of an abnormality in the area m_m + 1, for example, the presence or absence of a vehicle stopped in a tunnel. Is determined.

Embodiment 2 Embodiment 2 A road monitoring device according to Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 3 is a diagram showing a configuration of a road monitoring device according to Embodiment 2 of the present invention.

FIG. 3 shows a group of sensors (1,..., M−1,
m, m + 1, m + 2,..., n) show a road monitoring device using an image sensor.

The image sensor (1,..., M-1, m, m
For (+1, m + 2,..., N), the number and speed of vehicles passing through the screen can be measured by performing image processing on the camera video. The comparison of the measured values between the sensors can be performed using the presence or absence of the passage of the vehicle and the speed of the vehicle at the time of passage. Compared with the case where the ultrasonic sensor according to the first embodiment is used, the speed is added to the measured value to be compared.

For example, in FIG. 3, the area m_m + 2
In the case of the comparison, when the speed m of the vehicle is measured at the time tm by the sensor m, and the speed vm + Δv of the vehicle is measured at the time tm + Δt by the sensor m +, the time Δt and the speed Δv are evaluated to determine whether there is an abnormality. judge. Similarly, area m-
The determination of 1_m + 1 is performed, and a comprehensive determination is performed based on the determination results of both areas to determine whether there is an abnormality in the area m_m + 1.

As shown in FIG. 1, a road monitoring apparatus according to the present invention comprises a group of sensors (sensors 1 to 3) installed on a road.
n), a group of abnormality determining means (an abnormality determining means 10, an abnormality determining means 20,...) for determining an abnormality by comparing measured values between sensors, and two consecutive abnormality determining means 10,
A comprehensive determination means group (overall determination means 30,...) For comprehensively determining from the determination results of 20 is used to determine whether a vehicle traveling on the road has an abnormality.

That is, according to the present invention, the measured values are compared between adjacent sensors which are separated by one, between the sensors m-1 and m + 1, and between the sensors m and m + 2.
The two comparison results are comprehensively evaluated to detect an abnormality between adjacent sensors included in both of the two sensors, and an abnormality between the sensor m and the sensor m + 1. For example, if an erroneous detection is detected by the sensor m, an abnormality is detected between the sensor m and the sensor m + 2, that is, in the area m_m + 2.
No abnormality is detected between −1 and the sensor m + 1, that is, in the area m−1_m + 1. By comprehensively evaluating the result of the area m_m + 2 and the result of the area m-1_m + 1 and detecting an abnormality between the sensor m and the sensor m + 1, that is, an abnormality in the area m_m + 1, the influence of erroneous detection in the sensor m can be reduced.

[0031]

As described above, the road monitoring device according to the first aspect of the present invention includes first, second, third, and fourth sensors that are continuously installed on a road and detect vehicles. First abnormality determining means for comparing the measured values between the first and third sensors to determine abnormality of the vehicle;
A second abnormality determining means for comparing the measured values between the sensors to determine the abnormality of the vehicle, and the second and third sensors based on the determination results of the first and second abnormality determining means. And a comprehensive judgment means for judging the presence or absence of an abnormality of the vehicle traveling on the road. Therefore, it is possible to prevent an erroneous report that the vehicle is not abnormal but abnormal.

According to a second aspect of the present invention, as described above, the first, second, third, and fourth sensors are ultrasonic sensors, and pass through a vehicle immediately below the sensors. Since the measurement is performed, it is possible to prevent an erroneous report that an abnormality is occurring even though the measurement is not abnormal.

According to a third aspect of the present invention, as described above, the first, second, third, and fourth sensors are image sensors, and the vehicle passes through a predetermined screen. Since the presence or absence and the speed are measured, it is possible to prevent an erroneous report that an abnormality is present even though it is not abnormal.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a road monitoring device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a specific configuration of the road monitoring device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a specific configuration of a road monitoring device according to Embodiment 2 of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional road monitoring device.

[Explanation of symbols]

10 abnormality judgment means, 20 abnormality judgment means, 30 comprehensive judgment means.

Claims (3)

[Claims] 1. A first, second, third, and fourth sensor installed continuously on a road and detecting a vehicle, and a measurement value between the first and third sensors is compared. First abnormality determining means for determining abnormality; second abnormality determining means for comparing a measured value between the second and fourth sensors to determine abnormality of the vehicle; first and second abnormality Based on the judgment result of the judging means,
A road monitoring device comprising: a comprehensive determination unit that determines whether a vehicle traveling on a road between the second and third sensors is abnormal. 2. The road monitoring device according to claim 1, wherein the first, second, third, and fourth sensors are ultrasonic sensors, and measure the passage of a vehicle immediately below the sensors. 3. The apparatus according to claim 1, wherein the first, second, third and fourth sensors are image sensors and measure the presence or absence and speed of a vehicle passing through a predetermined screen. Road monitoring equipment.