JP6887797B2 - Vehicle width measuring device, vehicle width measuring method, and program - Google Patents

Description

The present invention relates to a vehicle width measuring device, a vehicle width measuring method, and a program.

As a device for measuring the vehicle specifications of a vehicle traveling in a lane, for example, as in Patent Document 1, a vehicle width measuring device for acquiring vehicle specifications such as a vehicle width using a pulse laser sensor is known.
For example, at a tollhouse on an expressway, an electronic toll that determines the vehicle type based on the vehicle width, which is a characteristic of the vehicle, and wirelessly communicates with a tollhouse resident or an on-board unit mounted on the vehicle. The collection system (ETC: Electronic Toll Collection System (registered trademark), also called "automatic toll collection system") may collect tolls according to the vehicle type. In order to measure the width of a vehicle passing through a lane, the toll collection equipment of such a tollhouse may be provided with the above-mentioned vehicle width measuring devices on both sides of the lane.

Japanese Unexamined Patent Publication No. 2001-143188

The conventional vehicle width measuring device has a configuration in which laser sensors for measuring the vehicle width are installed on islands provided on both sides of the lane. However, depending on the location conditions of the tollhouse, it may not be possible to secure sufficient space for installing the vehicle width measuring devices on both sides of the lane. For example, in a tollhouse provided on a viaduct or the like, a soundproof wall or the like is provided on one side in the width direction of the lane instead of an island, and it may not be possible to secure a space for installing a vehicle width measuring device. In addition, the length in the lane direction may be insufficient, and it may be difficult to arrange the vehicle width measuring devices as described in Patent Document 1 side by side in the lane direction.

The present invention has been made in view of such a problem, and provides a vehicle width measuring device, a vehicle width measuring method, and a program that can be installed even in a tollhouse where the installation space is limited.

In order to solve the above problems, the present invention employs the following means.
According to the first aspect of the present invention, the vehicle width measuring device (10) is a vehicle width measuring device that measures the vehicle width of a vehicle traveling in a lane, and is a first inspection light in the width direction of the lane. A first light emitting unit (E1) capable of projecting light, and a first light receiving unit provided so as to be paired with the first light projecting unit and capable of receiving reflected light of the first inspection light. The first vehicle detection unit (100) having (R1) and the vehicle passing through the lane at the vehicle detection position where the first inspection light is projected based on the reflected light of the first inspection light. A vehicle detection determination unit (135) that detects a vehicle and a second inspection light that is provided on one side in the width direction of the lane and is inclined toward the lane with respect to the width direction of the lane to emit a second inspection light. A second light projecting unit (E2) and a second light projecting unit provided on one side in the width direction of the lane so as to be paired with the second light projecting unit and capable of receiving the reflected light of the second inspection light. A second vehicle detection unit (110) having a light receiving unit (R2) and the second inspection light provided on the other side in the width direction of the lane and projected from the second light emitting unit are positively reflected. Of the detection results of the plurality of reflected lights received by the reflecting portion (120) that changes the traveling direction of the second inspection light and the second receiving portion, the light is transmitted through the reflecting portion to the lane. The first detection result of detecting the reflected light from the first side surface of the vehicle facing the other side in the width direction and the second detecting the reflected light from the second side surface of the vehicle facing one side in the width direction of the lane. A vehicle width calculation unit (130) for measuring the vehicle width of the vehicle based on the detection result of the above is provided.
By doing so, the vehicle width measuring device can measure the vehicle width of the vehicle based on the reflected light reflected from the first side surface and the second side surface of the vehicle. In addition, the vehicle width measuring device has a compact configuration in which only the reflecting portion that specularly reflects the second inspection light is installed on the other side in the width direction of the lane, so even in a tollhouse where the installation space is limited. It can be installed.
Further, the vehicle detection determination unit determines whether or not the vehicle has moved backward based on the detection result of the vehicle based on the reflected light of the first inspection light and the detection result of the reflected light of the second inspection light. can do. For example, a vehicle without an on-board unit may accidentally enter a lane equipped with an electronic toll collection system, and then move backward and re-enter another lane without an electronic toll collection system. .. At this time, if it is not possible to detect that the vehicle has moved backward and exited the lane, there is a possibility that an erroneous billing process will be performed in the electronic toll collection system. However, when the vehicle detection determination unit detects the reverse movement of the vehicle, it is possible to prevent erroneous billing processing from being performed in the electronic toll collection system.
Further, when the vehicle detection determination unit detects the reverse movement of the vehicle, it is possible to prevent the calculation result of the vehicle width from becoming inaccurate due to the behavior of the vehicle.

According to the second aspect of the present invention, in the vehicle width measuring device according to the above aspect, the vehicle width calculation unit reflects the second inspection light from the second light projecting unit by the vehicle. It has a distance calculation unit (131) that calculates the flight distance of the second inspection light to the reflected position and outputs it as a detection result of the reflected light. The vehicle width calculation unit has the smallest value among the detection results in which the distance from the second light projecting unit to the reflection position is larger than the distance from the second light projecting unit to the reflection unit. The result is specified as the first detection result, and the most of the detection results in which the distance from the second light projecting unit to the reflection position is smaller than the distance from the second light projecting unit to the reflection unit. A detection result having a small value is specified as the second detection result.
By doing so, the vehicle width calculation unit is based on the distance from the second light projecting unit to the reflection unit and the distance from the second light projecting unit to the reflection position on the vehicle. It is possible to select a first detection result showing the detection result of the reflected light reflected from one side surface and a second detection result showing the detection result of the reflected light reflected from the second side surface of the vehicle. ..

According to the third aspect of the present invention, in the vehicle width measuring device according to the above aspect, the second light projecting unit emits the second inspection light so as to intersect the vehicle detection position on the lane. The light is projected, and the vehicle width calculation unit acquires the flight distance of the second inspection light calculated by the distance calculation unit when the vehicle detection determination unit detects the vehicle as a third detection result. The distance calculation unit calculated the distance from the second light projecting unit measured in advance to the position where the second inspection light intersects the vehicle detection position and the third detection result. It further has an error calculation unit (133) for calculating a measurement error of the flight distance of the second inspection light.
By doing so, the error calculation unit has the distance from the second light projecting unit measured in advance to the position where the second inspection light and the vehicle detection position intersect, and the second calculated by the distance calculation unit. The measurement error of the flight distance of the second inspection light calculated by the distance calculation unit can be calculated by comparing the distance from the light projecting unit to the position where the second inspection light and the vehicle detection position intersect. The vehicle width calculation unit can improve the accuracy of the vehicle width measurement result by measuring the vehicle width of the vehicle in consideration of the measurement error.

According to the fourth aspect of the present invention, the vehicle width measuring method for measuring the vehicle width of the vehicle traveling in the lane includes the first projection step of projecting the first inspection light in the width direction of the lane. , A second projection step of projecting a second inspection light at an angle toward the lane with respect to the width direction of the lane from one side in the width direction of the lane, and reflection of the first inspection light. The first light receiving step for receiving light, the second light receiving step for receiving the reflected light of the second inspection light on one side in the width direction of the lane, and the first light receiving step on the other side in the width direction of the lane. Based on the reflection step in which the second inspection light projected in the second light projection step is positively reflected to change the traveling direction of the second inspection light, and the reflected light of the first inspection light, Of the vehicle detection determination step of detecting the vehicle passing through the lane at the vehicle detection position where the first inspection light is projected and the detection result of the plurality of reflected light received in the second light receiving step. The first detection result of detecting the reflected light from the first side surface of the vehicle facing the other side in the width direction of the lane through the reflection step, and the second of the vehicle facing the other side in the width direction of the lane. It has a vehicle width calculation step for measuring the vehicle width of the vehicle based on the second detection result of detecting the reflected light from the side surface.

According to the fifth aspect of the present invention, it is provided so as to be paired with the first light projecting unit capable of projecting the first inspection light in the width direction of the lane and the first light projecting unit. A first vehicle detection unit having a first light receiving unit capable of receiving the reflected light of the first inspection light and a first vehicle detection unit provided on one side in the width direction of the lane and facing the lane direction with respect to the width direction of the lane. A second light projecting unit that can be inclined to project the second inspection light, and a second light projecting unit that is provided so as to be paired with the second light projecting unit on one side in the width direction of the lane. A second vehicle detection unit having a second light receiving unit capable of receiving the reflected light of the inspection light, and the inspection light provided on the other side in the width direction of the lane and projected from the second light projecting unit. A program for operating a computer of a vehicle width measuring device including a reflecting unit that positively reflects the second inspection light to change the traveling direction of the second inspection light is based on the reflected light of the first inspection light. The detection result of the plurality of reflected lights received by the vehicle detection determination unit that detects the vehicle passing through the lane at the vehicle detection position where the first inspection light is projected, and the second light receiving unit. Among them, the first detection result of detecting the reflected light from the first side surface of the vehicle facing the other side in the width direction of the lane through the reflecting portion, and the second detection result of the vehicle facing one side in the width direction of the lane. Based on the second detection result of detecting the reflected light from the side surface, the vehicle is made to function as a vehicle width calculation unit for measuring the vehicle width of the vehicle.

According to the vehicle width measuring device, the vehicle width measuring method, and the program according to the present invention, it can be installed even in a tollhouse where the installation space is limited.

It is a top view which shows the outline of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is a perspective view which shows the outline of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is a figure which shows the functional structure of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is 1st figure for demonstrating the function of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is a 2nd figure for demonstrating the function of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is a 3rd figure for demonstrating the function of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is a 4th figure for demonstrating the function of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is a figure which shows the processing flow of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is a figure which shows the hardware configuration of the vehicle width measuring apparatus which concerns on 1st Embodiment. It is a figure which shows the functional structure of the vehicle width measuring apparatus which concerns on 2nd Embodiment. It is a figure for demonstrating the function of the vehicle width measuring apparatus which concerns on 2nd Embodiment. It is a figure which shows the processing flow of the vehicle width measuring apparatus which concerns on 2nd Embodiment. It is a figure which shows the functional structure of the distance measuring apparatus which concerns on other embodiment.

<First Embodiment>
Hereinafter, the vehicle width measuring device 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 9.

(Overall configuration of vehicle width measuring device)
FIG. 1 is a top view showing an outline of the vehicle width measuring device according to the first embodiment.
FIG. 2 is a perspective view showing an outline of the vehicle width measuring device according to the first embodiment.
The vehicle width measuring device 10 according to the present embodiment is a device provided at an exit tollhouse of an expressway, which is a toll road, for measuring the vehicle width of a vehicle A using the expressway. In another embodiment, the vehicle width measuring device 10 may be provided at the entrance tollhouse of the expressway.
In the example of FIG. 1, at the exit tollhouse, an island I is laid on one side (-Y side in FIG. 1) and an island I on the other side (+ Y in FIG. 1) along the lane connecting the expressway and the general road. On the side), a wall portion W such as a soundproof wall of an expressway is provided. Vehicle A exits from the highway to the general road through the lane.
In the following description, the direction in which the lane extends (± X direction in FIG. 1) is the "lane direction", and the expressway side in the lane direction (+ X side in FIG. 1) is the "upstream side" or "front in the lane direction". The "side" and the general road side in the lane direction (-X side in FIG. 1) are also referred to as "downstream side" or "back side in the lane direction". Further, the direction orthogonal to the lane direction (± Y direction in FIG. 1) is also described as the "lane width direction", and the direction orthogonal to the lane direction (± Z direction in FIG. 2) is the "height direction". Also described.

As shown in FIG. 1, the vehicle width measuring device 10 includes a vehicle detection unit 100 (first vehicle detection unit) and a sensor unit 110 (second vehicle detection unit) provided on the island I, and a wall portion W. It is provided with a reflecting portion 120 provided on a surface facing the lane of the vehicle.

As shown in FIGS. 1 and 2, the vehicle detection unit 100 has a rectangular shape extending in the height direction (± Z direction in FIG. 2) on the island I, and at a predetermined position in the lane direction. It is installed so that it faces the other side in the width direction of the lane. The vehicle detection unit 100 is a sensor that detects that the vehicle A has entered the position where the vehicle detection unit 100 is installed (hereinafter referred to as the vehicle detection position D) in the lane direction.
Specifically, the vehicle detection unit 100 includes a pair of light emitting units E1 (first light emitting unit) and light receiving units R1 (second light receiving unit) at predetermined intervals in the height direction. It is provided.
The light projecting unit E1 projects the inspection light Q (first inspection light) in parallel with the road surface of the lane toward the other side (+ Y side in FIG. 2) in the width direction of the lane. The light projecting unit E1 is, for example, a semiconductor laser that emits infrared light as inspection light Q. Further, the light projecting unit E1 is provided so that the light projecting direction is parallel to the width direction of the lane (± Y direction in FIG. 2).
The light receiving unit R1 receives the reflected light of the inspection light Q reflected by the vehicle A traveling on the lane, and thereby receives a detection signal associated with each of the inspection lights Q projected from the plurality of light emitting units E1. Is output.

As shown in FIG. 2, the sensor unit 110 is formed on the island I in a rectangular shape extending in the height direction (± Z direction in FIG. 2). Further, the sensor unit 110 is provided with a plurality of a pair of light projecting units E2 (second light emitting unit) and light receiving unit R2 (second light receiving unit) at predetermined intervals in the height direction. ..

The light projecting unit E2 projects the inspection light P in parallel with the road surface of the lane toward the other side (+ Y side in FIG. 2) in the width direction of the lane. The light projecting unit E2 is, for example, a semiconductor laser that emits infrared light as the inspection light P.
Further, in the present embodiment, the sensor unit 110 is installed so as to be inclined with respect to the lane direction and the width direction of the lane so that the light projecting unit E2 faces the upstream side of the lane (+ X side in FIG. 2). .. As a result, the light projecting unit E2 emits the inspection light P having a predetermined wavelength in a direction inclined toward the upstream side (+ X side in FIG. 2) in the lane direction with respect to the width direction of the lane (± Y direction in FIG. 2). Flood. More specifically, as shown in FIG. 1, the light projecting unit E2 is located on the vehicle detection position D extending in the width direction of the lane (± Y direction in FIG. 1) and at the center position in the width direction of the lane (vehicle). Inspected by inclining at a preset inclination angle θ with respect to the lane direction (± X direction in FIG. 1) so as to pass through the detection position D and the center line C indicating the center in the width direction of the lane). Light P is projected.
Further, as shown in FIG. 2, the light projected by each of the light projecting units of the vehicle detection unit 100 and the inspection light P projected by each of the light projecting units E2 of the sensor unit 110 are the vehicle detection position D. The positions of the light projecting unit E2 of the sensor unit 110 in the height direction (± Z direction of FIG. 2) are set so as to intersect at the position where the center line C of the lane intersects. Therefore, each of the plurality of light emitting units E2 emits light in a predetermined order, and also projects the inspection light P at different heights.

The light receiving unit R2 receives the reflected light of the inspection light P reflected by the vehicle A traveling on the lane, and transmits a detection signal associated with each of the inspection lights P projected from the plurality of light emitting units E2. Output.
In the present embodiment, the light receiving unit R2 does not output the detection signal when the reflected light of the inspection light P is not received, but in other embodiments, the detection indicating that the light is not received is detected. A signal may be output.

Further, inside the housing of the sensor unit 110, a vehicle width calculation unit 130 for measuring the vehicle width of the vehicle A traveling on the lane is provided based on the detection signal output by the light receiving unit R2. The functional configuration of the vehicle width calculation unit 130 will be described later.

As shown in FIG. 1, the reflecting portion 120 is a plane facing one side (−Y side in FIG. 1) of the wall portion W in the width direction of the lane, and the traveling direction of the inspection light P projected from the projecting portion E2. It is provided so as to be located above.
The reflecting portion 120 is a plate-shaped member formed of, for example, a mirror or the like. The reflection unit 120 specularly reflects the inspection light P projected from each of the light projection units E2 at the inspection light reflection position 120A corresponding to each of the inspection light P. That is, the reflecting unit 120 transmits the inspection light P incident from one side in the width direction of the lane (-Y side in FIG. 1) and the downstream side in the lane direction (-X side in FIG. 1) to the other side in the width direction of the lane (-X side in FIG. 1). The traveling direction of the inspection light P is changed by reflecting the light toward the + Y side in FIG. 1 and the upstream side in the lane direction (+ X side in FIG. 1). In the following description, when most of the incident light is reflected toward the side opposite to the incident direction at a reflection angle substantially the same as the incident angle, it is regarded as specular reflection. Further, among the inspection lights P projected from the light projecting unit E2, the inspection light P before reaching the reflecting unit 120 is also described as the inspection light P1, and the inspection light P whose traveling direction is changed by the reflecting unit 120 is described. It is also described as inspection light P2.
In this way, the reflecting unit 120 specularly reflects the inspection light P1 to change the traveling direction, so that the side surface of the vehicle A (hereinafter, the first side surface) faces the other side (+ Y side in FIG. 1) in the width direction of the lane. Can be irradiated with the inspection light P2. Then, the reflecting unit 120 further reflects the reflected light of the inspection light P2 reflected from the first side surface of the vehicle A toward the light receiving unit R2.

(Functional configuration of vehicle width measuring device)
Hereinafter, the functional configuration of the vehicle width measuring device 10 according to the present embodiment will be described with reference to FIGS. 3 to 7.
FIG. 3 is a diagram showing a functional configuration of the vehicle width measuring device according to the first embodiment.
As shown in FIG. 3, the vehicle width measuring device 10 includes the vehicle detection unit 100, the sensor unit 110, the reflection unit 120, and the vehicle width calculation unit 130 described above.

The vehicle width calculation unit 130 measures the vehicle width of the vehicle A traveling on the lane based on the detection signal output by the light receiving unit R2 of the sensor unit 110.
As shown in FIG. 3, the vehicle width calculation unit 130 includes a distance calculation unit 131, a vehicle width calculation unit 132, and a vehicle detection determination unit 135.

First, the distance calculation unit 131 projects the inspection light P from the light projecting unit E2 based on the detection signal output from the light receiving unit R2 of the sensor unit 110, and then the light receiving unit R2 performs the inspection light P (inspection). The time taken to receive the reflected light of the lights P1 and P2) is measured. Then, the distance calculation unit 131 calculates the flight distance of the inspection light P from the light projecting unit E2 to the reflection position where the inspection light P is reflected based on the measured time. The distance calculation unit 131 outputs the calculated flight distance of the inspection light P to the vehicle width calculation unit 132 as a detection result of the reflected light of the inspection light P.
The vehicle width calculation unit 132 calculates the vehicle width of the vehicle A based on the detection result of the inspection light P output from the distance calculation unit 131.
The vehicle detection determination unit 135 measures the distance from the light projecting unit E1 to the vehicle A based on the detection signal output from the light receiving unit R1 of the vehicle detection unit 100. When the vehicle A is not traveling on the lane, the inspection light Q projected from the light emitting unit E1 is reflected by the wall portion W, and the light receiving unit R1 receives the reflected light from the wall portion W. At this time, the vehicle detection determination unit 135 stores the distance from the light projecting unit E1 to the wall unit W in advance. That is, when the detected distance is the distance from the light projecting unit E1 to the wall portion W, the vehicle detection determination unit 135 determines that the vehicle A has not been detected. On the other hand, when the detected distance is shorter than the distance from the light projecting unit E1 to the wall portion W, the vehicle detection determination unit 135 determines that the vehicle A is passing through the vehicle detection position D. Further, the vehicle detection unit 100 outputs a detection signal indicating that the vehicle A has been detected to the distance calculation unit 131 while determining that the vehicle A is passing through the vehicle detection position D.

FIG. 4 is a first diagram for explaining the function of the vehicle width measuring device according to the first embodiment.
FIG. 5 is a second diagram for explaining the function of the vehicle width measuring device according to the first embodiment.
FIG. 6 is a third diagram for explaining the function of the vehicle width measuring device according to the first embodiment.
FIG. 7 is a fourth diagram for explaining the function of the vehicle width measuring device according to the first embodiment.
Hereinafter, a process in which the distance calculation unit 131 calculates the flight distance of the inspection light P from the light projection unit E2 to the reflection position will be described with reference to FIGS. 1 and 4 to 7.
The graph of FIG. 4 is an example showing the flight distance calculated by the distance calculation unit 131 in time series, the horizontal axis shows time, and the vertical axis shows the flight distance of the inspection light P.
At the time of "t0" in FIG. 4, as shown in FIG. 1, the vehicle A has not entered the detection range of the vehicle by the sensor unit 110, that is, the range in which the inspection light P on the lane is projected. In this case, the inspection light P1 projected from the light projecting unit E2 at the time of "t0" is reflected by the reflecting unit 120 and travels as the inspection light P2 to the upstream side (+ X side in FIG. 1) in the lane direction. Since there is nothing on the lane that reflects the inspection light P2, none of the plurality of light receiving units R2 receives the reflected light of the inspection light P1 and the inspection light P2. In this way, when the detection signals are not output from all the light receiving units R2, the distance calculation unit 131 sets the value of the flight distance of the inspection light P at the time of "t0" to infinity (∞).

Further, it is assumed that the vehicle A has entered the range where the inspection light P (inspection light P2) is projected on the vehicle A at the time of "t1" in FIG. In this case, the inspection light P1 projected from the light projecting unit E2 at the time of "t1" is reflected by the reflecting unit 120 and travels as the inspection light P2 to the upstream side (+ X side in FIG. 1) in the lane direction. For example, it is reflected at a reflection position on the front surface of the vehicle A (the surface facing the downstream side in the lane direction). The light receiving unit R2 receives the reflected light of the inspection light P2 and outputs a detection signal. The distance calculation unit 131 measures the time from when the inspection light P1 is projected to when the reflected light of the inspection light P1 (inspection light P2) is received, based on the detection signal output from the light receiving unit R2. .. Then, based on the measured time, the flight distance of the inspection light P (inspection light P1 and P2) from the light projecting unit E2 to the front surface of the vehicle A is calculated.

Further, it is assumed that the vehicle A has reached the position where the inspection light P2 is irradiated on the first side surface of the vehicle A as shown in FIG. 5 at the time of “t2” in FIG. The inspection light P1 projected from the light projecting unit E2 at the time of “t2” is reflected by the reflecting unit 120 and travels as the inspection light P2 to the upstream side in the lane direction (+ X side in FIG. 5), and the vehicle A It is reflected at the reflection position on the first side surface. The distance calculation unit 131 performs the same processing as described above to calculate the flight distance of the inspection light P (inspection light P1 and P2) from the light projecting unit E2 to the reflection position on the first side surface of the vehicle A. At this time, the flight distance of the inspection light P calculated by the distance calculation unit 131 is the distance L1 from the light projecting unit E2 to the reflection unit 120 (inspection light reflection position 120A) and the vehicle from the reflection unit 120 (inspection light reflection position 120A). It is a value (L1 + L2) that is the sum of the distance L2 to the reflection position on the first side surface of A.

Further, it is assumed that the vehicle A has reached the position where the inspection light P1 is applied to the front surface of the vehicle A at the time of "t3" in FIG. The inspection light P1 projected from the light projecting unit E2 at the time of "t3" is reflected at the reflection position on the front surface of the vehicle A before reaching the reflecting unit 120. At this time, the flight distance of the inspection light P (inspection light P1) calculated by the distance calculation unit 131 is the distance from the light projection unit E2 to the reflection position on the front surface of the vehicle, and the distance from the light projection unit E2 to the reflection unit 120 (inspection light). The value is smaller than the distance L1 to the reflection position 120A).

Further, it is assumed that the vehicle detection determination unit 135 detects that the vehicle A has reached the vehicle detection position D at the time of “t4” in FIG. 4, as shown in FIG.
The inspection light P1 projected from the light projecting unit E2 at the time of "t4" is reflected at the reflection position on the front surface of the vehicle A. At this time, the flight distance of the inspection light P calculated by the distance calculation unit 131 is the distance L3 from the light projection unit E2 to the reflection position on the front surface of the vehicle.

Further, at the time of "t5" in FIG. 4, as shown in FIG. 7, the inspection light P1 is on the side surface (hereinafter, the second side surface) of the vehicle A on one side (-Y side in FIG. 7) in the width direction of the lane. It is assumed that the vehicle A has reached the position to be irradiated. The inspection light P1 projected from the light projecting unit E2 at the time of "t5" does not reach the reflecting unit 120 and is reflected at the reflecting position on the second side surface of the vehicle A. At this time, the flight distance of the inspection light P (inspection light P1) calculated by the distance calculation unit 131 is the distance L4 from the light projection unit E2 to the reflection position on the second side surface of the vehicle, and is calculated by the distance calculation unit 131. It is the smallest value among the flight distance values of the inspection light P.

Further, it is assumed that the vehicle A has passed downstream of the irradiation range of the inspection light P1 in the lane direction at the time of "t6" in FIG. The inspection light P1 projected from the light projecting unit E2 at the time of "t6" is reflected by the reflecting unit 120 as the inspection light P2 toward the upstream side in the lane direction, similarly to the inspection light P1 at the time of "t0". proceed. At this time, since there is nothing on the lane that reflects the inspection light P1 and the inspection light P2, none of the plurality of light receiving units R2 receives the reflected light of the inspection light P1 and the inspection light P2. In this way, when the detection signals are not output from all the light receiving units R2, the distance calculation unit 131 sets the value of the flight distance of the inspection light P at the time of “t6” to infinity (∞).

The light receiving unit R2 outputs a plurality of detection signals associated with each of the inspection lights P1 projected by the plurality of light projecting units E2 at the time of “t2”, for example. The distance calculation unit 131 calculates a plurality of flight distances of the inspection light P at the time point of "t2" based on each of the plurality of detection signals. At this time, since the inspection light P is projected at different heights, if the first side surface of the vehicle A has irregularities, the calculation result of the flight distance of the inspection light P may vary. In this case, the distance calculation unit 131 selects, for example, the largest value among the calculation results that are effective values (values other than infinity), and sets the flight distance of the inspection light P as the flight distance at the time of "t2". It may be output to the width calculation unit 132, or the calculation result which is an effective value may be averaged and used as the flight distance of the inspection light P at that time point.

The vehicle width calculation unit 132 calculates the vehicle width of the vehicle A based on the detection result of the inspection light P output from the distance calculation unit 131 (the flight distance of the inspection light P at each time point).
In the example of FIG. 4, the vehicle width calculation unit 132 has one unit of a plurality of detection results in the period from “t1” to “t6” in which the flight distance value of the inspection light P is other than infinity (∞). Judge that it is associated with the vehicle.

Further, the vehicle detection determination unit 135 detects the forward movement and the reverse movement of the vehicle A based on the flight distance of the inspection light P at each time point calculated by the distance calculation unit 131.
For example, when the vehicle A moves forward on the lane (travels in the −X direction in FIG. 1), the vehicle detection determination unit 135 detects that the vehicle A has reached the vehicle detection position D, that is, “ A flight distance longer than the distance L3 is detected at a time before "t4" (period "t1" to "t4"), and a time after "t4" (period "t4" to "t5"). ) Detects a flight distance shorter than the distance L3. On the other hand, when the vehicle A reaches the vehicle detection position D and then moves backward, the vehicle detection determination unit 135 detects a flight distance longer than the distance L3 at a time after "t4". In this way, the vehicle detection determination unit 135 advances the vehicle A and passes through the vehicle detection position D based on the flight distance at the time before and after the timing (“t4”) when the vehicle A reaches the vehicle detection position D. It can be determined whether the vehicle has passed (passed in the −X direction in FIG. 1) or has left the vehicle detection position (exited in the + X direction in FIG. 1) by moving backward.
Further, when the vehicle A is moving forward on the lane (traveling in the −X direction in FIG. 1), as shown in FIG. 4, the flight distance decreases during the period from “t1” to “t2”, and “ The flight distance is substantially constant during the period from "t2" to "t3" (the period during which the inspection light P is reflected on the first side surface of the vehicle A as shown in FIG. 5). Then, when the vehicle detection determination unit 135 detects that the vehicle A has reached the vehicle detection position D at the time of "t3", the flight distance decreases in the period of "t3" to "t5", and the flight distance decreases from "t5" to "t5". A measurement pattern is obtained in which the flight distance is substantially constant during the period of "t6" (the period during which the inspection light P is reflected on the second side surface of the vehicle A as shown in FIG. 7). When the flight distance different from the above measurement pattern is calculated by the vehicle detection determination unit 135 (for example, when the flight distance increases in the period of "t2" to "t3", the value of the flight distance is infinite. (For example, when), it may be determined that the vehicle A has moved backward (traveled in the + X direction in FIG. 1).
For example, there is a tollhouse having a plurality of lanes, one is a lane in which a collector is resident to collect tolls (general lane) and the other is a lane in which an electronic toll collection system is provided (ETC dedicated lane). At such a tollhouse, if vehicle A, which is not equipped with an on-board unit, accidentally enters the ETC dedicated lane, it may move backward and re-enter the general lane. At this time, if it is not possible to detect that the vehicle moves backward and exits the ETC dedicated lane after the vehicle detection unit 100 detects the vehicle A, the electronic toll collection system installed in the ETC dedicated lane erroneously charges the vehicle. May be done. Therefore, as in the present embodiment, the vehicle detection determination unit 135 detects the forward movement and the reverse movement of the vehicle A, and determines whether the vehicle A has passed the tollhouse forward or has moved backward and exited. .. As a result, the vehicle detection and determination unit 135 can prevent erroneous billing processing from being performed in the electronic toll collection system.
When the vehicle detection determination unit 135 determines that the vehicle A has moved backward, for example, the vehicle width calculation unit 132 calculates the vehicle width by excluding the flight distance calculated while the vehicle A is moving backward. As a result, it is possible to prevent the calculation result of the vehicle width from becoming inaccurate due to the behavior of the vehicle A.

(Processing flow of vehicle width measuring device)
FIG. 8 is a diagram showing a processing flow of the vehicle width measuring device according to the first embodiment.
Hereinafter, the process of calculating the vehicle width by the vehicle width calculation unit 132 will be described with reference to FIG.
First, the vehicle width calculation unit 132 indicates the flight distance of the inspection light P from the light projection unit E2 to the first side surface of the vehicle A from the flight distance of the inspection light P at each time point calculated by the distance calculation unit 131. “One detection result” is specified (step S101).
In the present embodiment, the distance L1 (FIG. 5), which is a value obtained by measuring the actual distance from the light projecting unit E2 to the reflecting unit 120 (inspection light reflecting position 120A), is input to the vehicle width calculating unit 132 in advance. There is. The vehicle width calculation unit 132 determines the flight distance of the inspection light P having the smallest value among the group of flight distances of the inspection light P having a value larger than the distance L1 from the light projecting unit E2 to the first side surface of the vehicle A. It is extracted as a "first detection result" indicating the flight distance of the inspection light P to the upper reflection position. In the example of FIG. 4, the vehicle width calculation unit 132 calculates a value larger than the distance L1 in the period from “t1” to “t3”, and the smallest value among them is “t2”. It is "L1 + L2" calculated in the period from "" to "t3". The vehicle width calculation unit 132 specifies the flight distance “L1 + L2” of the inspection light P as the “first detection result”.

Next, the vehicle width calculation unit 132 indicates the flight distance of the inspection light P from the light projection unit E2 to the second side surface of the vehicle A from the flight distance of the inspection light P at each time point calculated by the distance calculation unit 131. The second detection result ”is specified (step S102).
The vehicle width calculation unit 132 sets the flight distance of the inspection light P having the smallest value among the group of flight distances of the inspection light P having a value smaller than the distance L1 from the light projecting unit E2 to the second side surface of the vehicle A. It is extracted as a "second detection result" indicating the flight distance of the inspection light P up to. In the example of FIG. 4, the vehicle width calculation unit 132 calculates a value smaller than the distance L1 in the period from “t3” to “t6”, and the smallest value among them is “t5”. It is "L4" calculated in the period from "" to "t6". The vehicle width calculation unit 132 specifies the flight distance “L4” of the inspection light P as the “second detection result”.

If the vehicle body of the vehicle A has irregularities, the flight distance of the inspection light P may vary depending on the reflection position on the first side surface of the vehicle A. Therefore, the vehicle width calculation unit 132 determines the inspection light P having a value within a predetermined error range (for example, within 10 cm) from the minimum value in the flight distance group of the inspection light P having a value larger than the distance L1. The flight distance may be extracted and the average value of the extracted population may be specified as the "first detection result". Further, the vehicle width calculation unit 132 performs statistical processing on the detection results in the period from "t1" to "t6", extracts the minimum value group in the group having a value of the distance L1 or more based on the standard deviation, and also extracts the minimum value group. , The average value of the extracted population may be specified as the "first detection result". The same applies to the "second detection result".

Next, as shown in FIG. 5, the vehicle width calculation unit 132 calculates the distance Y2 in the width direction of the lane from the reflection unit 120 to the first side surface of the vehicle A based on the “first detection result”. (Step S103).
First, the vehicle width calculation unit 132 calculates the flight distance L2 of the inspection light P from the reflection unit 120 (inspection light reflection position 120A) to the first side surface of the vehicle A based on the “first detection result”. As described above, since the distance L1 from the light projecting unit E2 to the reflecting unit 120 (inspection light reflecting position 120A) is input to the vehicle width calculating unit 132 in advance, the vehicle width calculating unit 132 "first detection". The value obtained by subtracting the distance L1 (the flight distance of the inspection light P1) from the flight distance of the inspection light P (the inspection light P1 and P2) indicated by the "result" is calculated as the value of the distance L2 (the flight distance of the inspection light P2).
Then, the vehicle width calculation unit 132 calculates the horizontal distance Y2 between the first side surface of the vehicle A and the reflection unit 120 based on the distance L2. As described above, the light projecting unit E2 inclines at a preset inclination angle θ with respect to the lane direction to project the inspection light P1. Therefore, the traveling direction of the inspection light P2 that is specularly reflected by the reflecting unit 120 is also inclined at the same inclination angle θ with respect to the lane direction. The vehicle width calculation unit 132 calculates the distance Y2 by the following mathematical formula (1) based on the inclination angle θ and the distance L2.
Y2 = L2 × sinθ ・ ・ ・ (1)

Next, as shown in FIG. 7, the vehicle width calculation unit 132 calculates the distance Y3 in the width direction of the lane from the light projecting unit E2 to the second side surface of the vehicle A based on the “second detection result”. (Step S104).
The vehicle width calculation unit 132 is based on the flight distance L4 of the inspection light P from the light projecting unit E2 to the first side surface of the vehicle A indicated by the “second detection result” and the inclination angle θ of the inspection light P. The distance Y3 is calculated by the following mathematical formula (2).
Y3 = L4 × sinθ ・ ・ ・ (2)

Next, the vehicle width calculation unit 132 calculates the vehicle width of the vehicle A (step S105).
In the present embodiment, the distance Y1 (FIG. 5), which is a value obtained by measuring the actual distance in the width direction of the lane from the light projecting unit E2 to the reflecting unit 120, is input to the vehicle width calculation unit 132 in advance. The vehicle width calculation unit 132 calculates the vehicle width of the vehicle A by subtracting the calculated distance Y2 and distance Y3 from the distance Y1.

(Hardware configuration of vehicle width measuring device)
FIG. 9 is a diagram showing a hardware configuration of the vehicle width measuring device according to the first embodiment.
Hereinafter, the hardware configuration of the vehicle width measuring device 10 will be described with reference to FIG.

The computer 900 includes a CPU 901, a main storage device 902, an auxiliary storage device 903, an input / output interface 904, and a communication interface 905.
The vehicle width calculation unit 130 of the vehicle width measuring device 10 described above is mounted on the computer 900. Then, the operation of the vehicle width calculation unit 130 of the vehicle width measuring device 10 described above is stored in the auxiliary storage device 903 of each computer 900 in the form of a program. The CPU 901 reads the program from the auxiliary storage device 903, expands it to the main storage device 902, and executes the above processing according to the program. Further, the CPU 901 stores various data (detection signals and the like) acquired by the vehicle width measuring device 10 via the sensor unit 110 and various data calculated by the vehicle width calculating unit 130 in accordance with the vehicle width measurement according to the program. A storage area (not shown) is secured in the main storage device 902. Further, the CPU 901 secures a storage area for storing the data being processed in the auxiliary storage device 903 according to the program.
The computer 900 is connected to the external storage device 910 via the input / output interface 904, and the storage area (not shown) of the vehicle width measuring device 10 may be secured in the external storage device 910. Further, the computer 900 is connected to the external storage device 920 via the communication interface 905, and the storage area (not shown) of the vehicle width measuring device 10 may be secured in the external storage device 920.

In at least one embodiment, the auxiliary storage device 903 is an example of a non-temporary tangible medium. Other examples of non-temporary tangible media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, etc. connected via the input / output interface 904. When this program is distributed to the computer 900 via a communication line, the distributed computer 900 may expand the program to the main storage device 902 and execute the above processing.

Further, the program may be for realizing a part of the above-mentioned functions. Further, the program may be a so-called difference file (difference program) that realizes the above-mentioned function in combination with another program already stored in the auxiliary storage device 903.

(Action effect)
As described above, the vehicle width measuring device 10 according to the present embodiment has the light projecting unit E1 (first light projecting unit) capable of projecting the inspection light Q (first inspection light) in the width direction of the lane. And a vehicle detection unit 100 (first vehicle detection unit) having a light receiving unit R1 (first light receiving unit) that is provided so as to be paired with the light projecting unit E1 and capable of receiving the reflected light of the inspection light Q. A vehicle detection determination unit 135 that detects a vehicle A passing through a lane at a vehicle detection position D where the inspection light Q is projected based on the reflected light of the inspection light Q, and a lane provided on one side in the width direction of the lane. The inspection light P (second inspection light) can be projected toward the lane direction with respect to the width direction of the light projecting unit E2 (second light projecting unit), and the inspection light P (second inspection light) is projected on one side in the width direction of the lane. A sensor unit 110 (second vehicle detection unit) having a light receiving unit R2 (second light receiving unit) provided so as to be paired with the light unit E2 and capable of receiving the reflected light of the inspection light P, and a lane width. A reflection unit 120, which is provided on the other side of the direction and positively reflects the inspection light P projected from the light projecting unit E2 to change the traveling direction of the inspection light P, and detection of a plurality of reflected lights received by the light receiving unit R2. Among the results, the first detection result of detecting the reflected light from the first side surface of the vehicle A on the other side in the width direction of the lane through the reflecting portion 120 and the second side surface of the vehicle A on one side in the width direction of the lane. A vehicle width calculation unit 132 that measures the vehicle width of the vehicle A based on the second detection result of detecting the reflected light from the vehicle A is provided.
By doing so, the vehicle width measuring device 10 can measure the vehicle width of the vehicle A based on the reflected light reflected from the first side surface and the second side surface of the vehicle A. Further, since the vehicle width measuring device 10 has a compact configuration in which only the reflecting portion 120 that specularly reflects the inspection light P is installed on the other side in the width direction of the lane, even in a tollhouse where the installation space is limited. It can be installed.
Further, the vehicle detection determination unit 135 determines whether or not the vehicle A has moved backward based on the detection result of the vehicle A based on the reflected light of the inspection light Q and the detection result of the reflected light of the inspection light P. be able to.
For example, if vehicle A enters the ETC-dedicated lane and then moves backward and re-enters another lane (general lane), the electronic toll collection system installed in the ETC-dedicated lane will perform incorrect billing processing. There is a possibility that it will end up. However, when the vehicle detection determination unit 135 detects the reverse movement of the vehicle A, it is possible to prevent erroneous billing processing from being performed in the electronic toll collection system.
When the vehicle detection determination unit 135 detects the reverse movement of the vehicle A, for example, the vehicle width calculation unit 132 calculates the vehicle width by excluding the flight distance calculated while the vehicle A is moving backward. As a result, it is possible to prevent the calculation result of the vehicle width from becoming inaccurate due to the behavior of the vehicle A.

Further, the vehicle width calculation unit 132 has a distance calculation unit 131 that calculates the distance from the light projection unit E2 to the reflection position where the inspection light P is reflected by the vehicle A based on the detection results of the plurality of reflected lights. The vehicle width calculation unit 132 sets the detection result having the smallest value among the detection results in which the distance from the light projecting unit E2 to the reflection position is larger than the distance L1 from the light projecting unit E2 to the reflection unit 120. The detection result having the smallest value among the detection results in which the distance from the light projecting unit E2 to the reflection position is smaller than the distance L1 from the light projecting unit E2 to the reflection unit 120 is selected as "detection result" and is "second". Select as "Detection result".
By doing so, the distance calculation unit 131 can calculate the distance (detection result) to the reflection position at each timing when the light projecting unit E2 projects the inspection light P. Then, the vehicle width calculation unit 132 is a distance based on the distance L1 from the light projecting unit E2 to the reflection unit 120 and the distance from the light projecting unit E2 calculated by the distance calculation unit 131 to the reflection position on the vehicle A. Of the plurality of detection results calculated by the calculation unit 131, the first detection result indicating the detection result of the reflected light reflected from the first side surface of the vehicle A and the reflected light reflected from the second side surface of the vehicle A. It is possible to select a second detection result that indicates the detection result.

In the present embodiment, the vehicle width calculation unit 132 determines the flight distance of the inspection light P having the smallest value among the group of flight distances of the inspection light P having a value larger (smaller) than the distance L1. Although the aspect specified as "one detection result (second detection result)" has been described, the present invention is not limited to this. The vehicle width calculation unit 132 sets this value as the "first detection result" when the same value continues for a certain period of time or more in the group of flight distances of the inspection light P having a value larger (smaller) than the distance L1. (Second detection result) ”may be specified. At this time, the vehicle width calculation unit 132 determines that the values are the same if they are within a predetermined error range (for example, within 10 cm) in consideration of the unevenness of the vehicle.

<Second embodiment>
Next, the vehicle width measuring device 10 according to the second embodiment of the present invention will be described with reference to FIGS. 10 to 12.
The components common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
In the present embodiment, the functional configuration of the vehicle width calculation unit 130 is different from that of the first embodiment.

(Functional configuration of vehicle width measuring device)
Hereinafter, the functional configuration of the vehicle width measuring device 10 according to the present embodiment will be described with reference to FIGS. 10 to 12.
FIG. 10 is a diagram showing a functional configuration of the vehicle width measuring device according to the second embodiment.
As shown in FIG. 10, the vehicle width calculation unit 130 according to the present embodiment further includes an error calculation unit 133.
In the first embodiment, since the distance calculation unit 131 calculates the flight distance of the inspection light P based only on the detection signal output from the light receiving unit R2, this calculation result may include a measurement error. There is. Therefore, the vehicle width calculation unit 130 according to the present embodiment calculates such a measurement error by the error calculation unit 133, and measures the vehicle width reflecting the measurement error.

FIG. 11 is a diagram for explaining the function of the vehicle width measuring device according to the second embodiment.
FIG. 12 is a diagram showing a processing flow of the vehicle width measuring device according to the second embodiment.
Hereinafter, a process in which the vehicle width measuring device 10 measures the vehicle width in consideration of the measurement error will be described with reference to FIGS. 11 to 12.
First, a distance L5 (FIG. 11), which is a measured value of the actual distance from the light projecting unit E2 to the intersection of the vehicle detection position D and the center line C, is input to the error calculation unit 133 in advance.
Further, as shown in FIG. 11, the error calculation unit 133 has a flight distance (third) of the inspection light P at the time when the vehicle detection unit 100 detects the vehicle A (when the vehicle A reaches the vehicle detection position D). The detection result) is acquired as the reference distance L5'(step S201).

Next, the error calculation unit 133 calculates the difference ΔL5 between the actual distance L5 and the reference distance L5'as a measurement error and outputs it to the vehicle width calculation unit 132 (step S202).
The error calculation unit 133 may calculate the proportional coefficient α (“α = L5 / L5 ′”) of the actual distance L5 with respect to the reference distance L5 ′ as a measurement error.
Further, the error calculation unit 133 may calculate the distance X'from the light projecting unit E2 in the lane direction to the front surface of the vehicle A based on the reference distance L5'and the inclination angle θ of the inspection light P1. Good. In this case, the distance X, which is a measured value of the actual distance from the light projecting unit E2 in the lane direction to the vehicle detection position D, is input to the error calculation unit 133 in advance. Then, the error calculation unit 133 determines the measurement error (difference ΔX between the distance X and the distance X'or the proportional coefficient “α” of the distance X with respect to the distance X'based on the calculated distance X'and the actual distance X. = X / X'") may be calculated.

Next, the vehicle width calculation unit 132 first detects the first detection result (FIG.) based on the flight distance (detection result) of the inspection light P calculated by the distance calculation unit 131 and the measurement error calculated by the error calculation unit 133. 4 and “L1 + L2” in FIG. 5) and the second detection result (“L4” in FIGS. 4 and 7) are modified (step S203).
The vehicle width calculation unit 132 calculates the first detection result (“L1 + L2”) and the second detection result (“L1 + L2”) when the error calculation unit 133 calculates the difference ΔL5 between the actual distance L5 and the reference distance L5 ′ as a measurement error. The first detection result and the second detection result are modified by subtracting ΔL5 from each of L4).
Further, when the error calculation unit 133 calculates the proportional coefficient α of the actual distance L5 with respect to the reference distance L5'as a measurement error, the vehicle width calculation unit 132 determines the first detection result and the second detection result, respectively. The first detection result and the second detection result are modified by multiplying by the proportionality coefficient α.

Next, the vehicle width calculation unit 132 calculates the vehicle width of the vehicle A based on the corrected first detection result and the second detection result (step S204). The process performed by the vehicle width calculation unit 132 in step S204 is the same as the process of the vehicle width calculation unit 132 of the first embodiment (steps S103 to S105).

(Action effect)
As described above, in the vehicle width measuring device 10 according to the present embodiment, the light emitting unit E2 projects the inspection light P so as to intersect the vehicle detection position D on the lane. The vehicle width calculation unit 132 acquires the flight distance of the inspection light P calculated by the distance calculation unit 131 when the vehicle detection unit 100 detects the vehicle A as a third detection result, and the inspection light P from the light projection unit E2. The measurement error of the flight distance of the inspection light P calculated by the distance calculation unit 131 based on the distance L5 measured in advance up to the position where the vehicle detection position D and the vehicle detection position D intersect and the third detection result (distance L5'). It further has an error calculation unit 133 for calculation.
By doing so, the error calculation unit 133 has the distance L5 from the pre-measured light projection unit E2 to the position where the inspection light P and the vehicle detection position D intersect, and the light projection unit calculated by the distance calculation unit 131. The measurement error of the flight distance of the inspection light P calculated by the distance calculation unit 131 can be calculated by comparing the distance L5'from E2 to the position where the inspection light P and the vehicle detection position D intersect. The vehicle width calculation unit 132 can improve the accuracy of the vehicle width measurement result by measuring the vehicle width of the vehicle A by reflecting the measurement error.

<Other Embodiments>
Hereinafter, as another embodiment, the distance measuring device 10A for measuring the distance to the vehicle A will be described instead of the vehicle width measuring device 10 according to the first and second embodiments described above.
FIG. 13 is a diagram showing a functional configuration of a distance measuring device according to another embodiment.
As shown in FIG. 13, the distance measuring device 10A according to the present embodiment is a sensor having a vehicle detection unit 100, a light emitting unit E2, and a light receiving unit R2, similarly to the vehicle width measuring device 10 according to the above-described embodiment. It is provided with a unit 110. The functional configurations of the vehicle detection unit 100 and the sensor unit 110 are the same as those of the vehicle width measuring device 10 according to the above-described embodiment.
Further, the distance measuring device 10A includes a distance calculating unit 130A instead of the vehicle width calculating unit 130 of the vehicle width measuring device 10 according to the above-described embodiment.
The distance measuring device 10A according to the present embodiment measures the flight distance of the inspection light P from the light projecting unit E2 to the reflection position on the front surface or the second side surface of the vehicle A. Therefore, in the present embodiment, as shown in FIG. 13, the reflective portion 120 may be omitted. Further, the distance measuring device 10A according to the present embodiment may output the measured flight distance of the inspection light P to a vehicle type discriminating device (not shown) or the like connected by a wired network. The vehicle type discriminating device uses the flight distance of the inspection light P measured by the distance measuring device 10A as information for specifying vehicle information (vehicle length, vehicle width, vehicle height, etc.) for specifying the vehicle type, for example.

The distance calculation unit 130A measures the distance from the light projecting unit E2 to the vehicle A traveling on the lane based on the detection signal output by the light receiving unit R2 of the sensor unit 110.
As shown in FIG. 13, the distance calculation unit 130A includes a distance calculation unit 131, an error calculation unit 133, and a distance output unit 134.
The distance calculation unit 131 and the error calculation unit 133 have the same functions as the distance calculation unit 131 and the error calculation unit 133 according to the second embodiment described above.
The distance output unit 134 is on the vehicle A from the light projection unit E2 at each time point based on the flight distance (detection result) of the inspection light P calculated by the distance calculation unit 131 and the measurement error calculated by the error calculation unit 133. Correct the flight distance of the inspection light P to the reflection position of. Then, the distance output unit 134 outputs the corrected flight distance of the inspection light P to a vehicle type discriminating device (not shown) or the like.
By having such a configuration, the distance measuring device 10A can improve the measurement accuracy of the flight distance of the inspection light P by reflecting the measurement error calculated by the error calculation unit 133.

Although the embodiments of the present invention have been described in detail above, they are not limited to these as long as they do not deviate from the technical idea of the present invention, and some design changes and the like are possible.
For example, in the first embodiment, the aspect in which the vehicle width measuring device 10 includes the vehicle detecting unit 100 has been described, but the present invention is not limited to this. In another embodiment, even if the vehicle detection unit 100 is omitted, the same operation and effect as in the first embodiment can be obtained.

Further, in the first embodiment, the vehicle width calculation unit 130 is in the width direction of the lane between the light emitting unit E2 and the second side surface of the vehicle A based on the detection signal of the light receiving unit R2 of the sensor unit 110. Although the mode for calculating the distance Y3 has been described, the present invention is not limited to this. For example, the vehicle width calculation unit 130 replaces the detection signal of the light receiving unit R2 with the distance Y3 in the width direction of the lane from the vehicle detection unit 100 to the second side surface of the vehicle A based on the detection signal of the vehicle detection unit 100. You may get it as'. In this case, the distance Y1', which is a measured value of the actual distance in the width direction of the lane from the vehicle detection unit 100 to the reflection unit 120, is input to the vehicle width calculation unit 132 in advance. Then, the vehicle width calculation unit 132 calculates the vehicle width of the vehicle A by subtracting the calculated distance Y2 and the distance Y3 from the distance Y1.

10 Vehicle width measuring device 10A Distance measuring device 100 Vehicle detection unit (first vehicle detection unit)
110 Sensor unit (second vehicle detection unit)
120 Reflection unit 130 Vehicle width calculation unit 130A Distance calculation unit 131 Distance calculation unit 132 Vehicle width calculation unit 133 Error calculation unit 134 Distance output unit 135 Vehicle detection and judgment unit E1, E2 Floodlight unit (first floodlight unit, second Floodlight section)
I Island R1, R2 light receiving part (first light receiving part, second light receiving part)
W wall

Claims (3)

A vehicle width measuring device that measures the width of a vehicle traveling in a lane.
The first light projecting unit capable of projecting the first inspection light in the width direction of the lane and the reflected light of the first test light provided to be paired with the first light projecting unit are provided. A first vehicle detection unit having a first light receiving unit capable of receiving light,
A vehicle detection determination unit that detects the vehicle passing through the lane at the vehicle detection position where the first inspection light is projected based on the reflected light of the first inspection light.
A second light projecting unit provided on one side in the width direction of the lane and capable of projecting a second inspection light inclined toward the lane with respect to the width direction of the lane, and one side in the width direction of the lane. A second vehicle detection unit provided on the side so as to be paired with the second light projecting unit and having a second light receiving unit capable of receiving the reflected light of the second inspection light.
A reflecting portion provided on the other side in the width direction of the lane to specularly reflect the second inspection light to change the traveling direction of the second inspection light.
Among the plurality of detection results of the reflected light received by the second light receiving unit, the first detected the reflected light from the first side surface of the vehicle facing the other side in the width direction of the lane via the reflecting unit. Based on the detection result of the above and the second detection result of detecting the reflected light from the second side surface of the vehicle facing one side in the width direction of the lane, the vehicle width calculation unit for measuring the vehicle width of the vehicle ,
Equipped with a,
The vehicle width calculation unit
The flight distance of the second inspection light from the second light projecting unit to the reflection position where the second inspection light is reflected by the vehicle is calculated, and the reflected light of the second inspection light is calculated. It has a distance calculation unit that outputs the detection result.
Among the detection results in which the distance from the second light projecting unit to the reflection position is larger than the distance from the second light projecting unit to the reflection unit, the detection result having the smallest value is the first detection. Identify as a result,
Among the detection results in which the distance from the second light projecting unit to the reflection position is smaller than the distance from the second light projecting unit to the reflection unit, the detection result having the smallest value is the second detection. Identify as a result,
The second light projecting unit projects the second inspection light so as to intersect the vehicle detection position on the lane.
The vehicle width calculation unit acquires the flight distance of the second inspection light calculated by the distance calculation unit when the vehicle detection determination unit detects the vehicle as a third detection result, and obtains the flight distance of the second inspection light as the third detection result. The second inspection calculated by the distance calculation unit based on the distance measured in advance from the light projecting unit to the position where the second inspection light intersects the vehicle detection position and the third detection result. It also has an error calculation unit that calculates the measurement error of the flight distance of light.
Vehicle width measuring device. It is a vehicle width measurement method that measures the width of a vehicle traveling in a lane.
A first projection step of projecting the first inspection light in the width direction of the lane by the first projection unit, and
A second projection step in which the second light projecting unit inclines from one side in the width direction of the lane toward the lane direction with respect to the width direction of the lane and projects the second inspection light.
The first light receiving step for receiving the reflected light of the first inspection light, and
A second light receiving step for receiving the reflected light of the second inspection light on one side in the width direction of the lane,
A reflection step in which the second inspection light projected in the second light projection step is specularly reflected on the other side in the width direction of the lane by the reflection unit to change the traveling direction of the second inspection light. When,
A vehicle detection determination step of detecting the vehicle passing through the lane at the vehicle detection position where the first inspection light is projected based on the reflected light of the first inspection light.
Among the plurality of detection results of the reflected light received in the second light receiving step, the first one that detects the reflected light from the first side surface of the vehicle facing the other side in the width direction of the lane via the reflection step. Based on the detection result of the above and the second detection result of detecting the reflected light from the second side surface of the vehicle facing one side in the width direction of the lane, the vehicle width calculation step for measuring the vehicle width of the vehicle ,
Have a,
The vehicle width calculation step is
The flight distance of the second inspection light from the second projection step to the reflection position where the second inspection light is reflected by the vehicle is calculated, and the reflected light of the second inspection light is calculated. It has a distance calculation step to output as a detection result,
Among the detection results in which the distance from the second light projecting unit to the reflection position is larger than the distance from the second light projecting unit to the reflection unit, the detection result having the smallest value is the first detection. Identify as a result,
Among the detection results in which the distance from the second light projecting unit to the reflection position is smaller than the distance from the second light projecting unit to the reflection unit, the detection result having the smallest value is the second detection. Identify as a result,
In the second projection step, the second inspection light is projected so as to intersect the vehicle detection position on the lane.
The vehicle width calculation step acquires the flight distance of the second inspection light calculated in the distance calculation step when the vehicle is detected in the vehicle detection determination step as a third detection result, and obtains the flight distance of the second inspection light as the third detection result. The second inspection calculated in the distance calculation step based on the distance measured in advance from the light projecting unit to the position where the second inspection light and the vehicle detection position intersect and the third detection result. It also has an error calculation step to calculate the measurement error of the flight distance of light.
Vehicle width measurement method. It is provided so as to be paired with the first light projecting unit capable of projecting the first inspection light in the width direction of the lane and the first light projecting unit, and receives the reflected light of the first inspection light. A first vehicle detector with a possible first light receiver,
A second light projecting unit provided on one side in the width direction of the lane and capable of projecting a second inspection light inclined toward the lane with respect to the width direction of the lane, and one side in the width direction of the lane. A second vehicle detection unit provided on the side so as to be paired with the second light projecting unit and having a second light receiving unit capable of receiving the reflected light of the second inspection light.
A reflecting unit provided on the other side in the width direction of the lane and for which the second inspection light projected from the second light projecting unit is specularly reflected to change the traveling direction of the second inspection light.
A program for operating the computer of the vehicle width measuring device provided with the above-mentioned computer.
A vehicle detection determination unit that detects a vehicle traveling in the lane passing through the lane at a vehicle detection position where the first inspection light is projected based on the reflected light of the first inspection light.
Among the plurality of detection results of the reflected light received by the second light receiving unit, the first one that detects the reflected light from the first side surface of the vehicle facing the other side in the width direction of the lane via the reflecting unit. A vehicle width calculation unit that measures the vehicle width based on the detection result and the second detection result of detecting the reflected light from the second side surface of the vehicle facing one side in the width direction of the lane.
To function as,
The vehicle width calculation unit
The flight distance of the second inspection light from the second light projecting unit to the reflection position where the second inspection light is reflected by the vehicle is calculated, and the reflected light of the second inspection light is calculated. It has a distance calculation unit that outputs the detection result.
Among the detection results in which the distance from the second light projecting unit to the reflection position is larger than the distance from the second light projecting unit to the reflection unit, the detection result having the smallest value is the first detection. Identify as a result,
Among the detection results in which the distance from the second light projecting unit to the reflection position is smaller than the distance from the second light projecting unit to the reflection unit, the detection result having the smallest value is the second detection. Identify as a result,
The second light projecting unit projects the second inspection light so as to intersect the vehicle detection position on the lane.
The vehicle width calculation unit acquires the flight distance of the second inspection light calculated by the distance calculation unit when the vehicle detection determination unit detects the vehicle as a third detection result, and obtains the flight distance of the second inspection light as the third detection result. The second inspection calculated by the distance calculation unit based on the distance measured in advance from the light projecting unit to the position where the second inspection light intersects the vehicle detection position and the third detection result. It also has an error calculation unit that calculates the measurement error of the flight distance of light.
program.

Images