JPH0962984A - Traffic volume measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] Exclude motorcycles etc. in traffic volume measurement to improve data reliability. When an automobile or a two-wheeled vehicle depresses a contact-type vehicle sensor installed on a road, front wheels and rear wheels generate detection signals 3a and 3b twice per vehicle.
The detection signal 3a of the automobile has a long signal distance t1 because the distance between the axles is long, and the detection signal 3b of the motorcycle has a short signal distance t2 because the distance between the axles is short. The measuring device uses this time difference to remove only the two-wheeled vehicle detection signal 3b. When there is a first sensing signal from the front wheels, the sensing time T is measured, and when there is a second sensing signal from the rear wheels, the inter-axle distance corresponding time tn is measured. Then, it is judged whether tn / T is larger or smaller than a predetermined threshold value K, and if smaller, it is judged as a two-wheeled vehicle and is not counted in the number of vehicles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic volume measuring device for measuring traffic volume, that is, the number of vehicles.

[0002]

2. Description of the Related Art In a conventional traffic volume measuring device, the presence or absence of a vehicle is determined by detecting a change in air pressure inside the rubber hose caused by the vehicle stepping on the rubber hose, thereby determining the traffic volume. Further, a contact-type pressure sensor is used to measure the traffic volume by an electric signal generated when the vehicle steps on the pressure sensor. Generally, one vehicle is determined by two vehicle detection signals of the front wheel and the rear wheel of the vehicle.

[0003]

However, in the above-mentioned conventional traffic volume measuring device, even a vehicle or the like which is not originally counted as the traffic volume is reflected in the traffic volume as one vehicle, so that the reliability of the data is improved. There was a problem with. Also,
In order to distinguish between a parallel running two-wheeled vehicle and an automobile, three strip-shaped contact type vehicle sensors with a ribbon-shaped resistor are used for one lane, and when the vehicle steps on the contact type, the left and right front wheels enter the sensor. Although it is determined by using the time difference, if the parallel running two-wheeled vehicle depresses the sensor when there is no difference in the approach time of the front wheels, it is difficult to distinguish between the parallel running two-wheeled vehicle and the automobile, and the reliability of the data is high. There was a problem in terms of sex. Furthermore, if a vehicle with six or more wheels, such as a truck or dump truck, steps on the contact-type vehicle sensor, two vehicles are required for each vehicle.
Since a vehicle detection signal is generated more than once, one vehicle is measured as a plurality of vehicles, and there is a problem in terms of data reliability.

The present invention is intended to solve such a conventional problem, and it is an object of the present invention to provide an excellent traffic volume measuring device having high data reliability.

[0005]

In order to achieve the above object, the present invention uses, as a first configuration, a contact type vehicle sensor having a band-shaped switch 1 circuit incorporated therein, and displays time difference information corresponding to an inter-axle distance. Based on the above, a means for removing the vehicle detection signal from the two-wheeled vehicle is provided.

A second structure of the present invention is a strip-shaped switch 2
A contact type vehicle sensor having a built-in circuit is used, and means for removing a vehicle detection signal from a single-wheeled two-wheeled vehicle or a two-wheeled two-wheeled vehicle based on the sensed AND signal from the vehicle sensor and the time difference information corresponding to the inter-axle distance is provided. .

According to a third aspect of the present invention, a duplicated vehicle detection signal due to a vehicle having a plurality of wheels on front wheels and / or rear wheels is detected and removed by time difference information between the front wheels or the rear wheels corresponding to the inter-axle distance. It is equipped with a means to do.

[0008]

According to the present invention, with the above configuration, the two-wheeled vehicle can be reliably excluded from the traffic volume measurement, the parallel-running two-wheeled vehicle and the automobile can be reliably distinguished from each other, and the parallel-running two-wheeled vehicle can be excluded from the traffic volume measurement. However, it can be surely measured as one unit.

[0009]

【Example】

(Embodiment 1) FIG. 1 is a block diagram showing the configuration of a traffic volume measuring apparatus in a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a contact type vehicle sensor, which is arranged at a right angle to the approaching direction of the vehicle on the road. Reference numeral 2 is a band-shaped switch 1 circuit built in the contact type vehicle sensor 1. Reference numeral 3 is a vehicle detection signal generated when the vehicle depresses the contact type vehicle sensor 1. Reference numeral 4 is a main body of the measuring device, 5 is a relative value discrimination processing unit for removing the motorcycle from the vehicle detection signal 3, 6 is a number signal after removing the motorcycle, and 7 is a traffic volume measuring unit for integrating the traffic volume per unit time. , 8 are traffic data, 9
Is a traffic volume storage unit.

Next, the operation of this embodiment will be described with reference to the relationship between the vehicle and the sensing signal shown in FIG. When an automobile or a two-wheeled vehicle depresses the contact type vehicle sensor 1 installed on the road, the switch 1 circuit 2 operates to output a vehicle detection signal 3. This sensing signal 3 is, as shown in FIG.
Both the automobile and the two-wheeled vehicle generate the detection signals 3a and 3b twice in total by the front wheel and the rear wheel. Car detection signal 3
In a, since the inter-axle distance is long, the signal interval, that is, the inter-axle distance corresponding time t1 is long, and in the two-wheeled vehicle sensing signal 3b, the inter-axle distance corresponding time t2 is short because the inter-axle distance is short. The relative value discrimination processing unit 5 of the measuring device body 4 uses this time difference to remove only the two-wheeled vehicle detection signal 3b.

FIG. 3 shows a processing procedure in the relative value discrimination processing section 5. In FIG. 3, first, when there is a first sensing signal from the front wheels (step 11), the sensing time T is measured (step 12). Then, when there is a second detection signal from the rear wheels (step 13), the time tn corresponding to the inter-axle distance is measured (step 14). Then, it is determined whether tn / T is larger or smaller than a predetermined threshold value K (step 15), and if smaller, it is determined that the vehicle is a motorcycle (step 16), and the number-of-vehicles signal is not output to the traffic volume measuring unit 7. If it is larger (step 17), it is judged to be an automobile (step 18), and a number signal is output to the traffic volume measuring unit 7 (step 19).

The threshold value K is theoretical and experimental from the ratio of the time t1 between the axle distances of the automobile and the front wheel detection time T, and the ratio between the time t2 between the axle distances of the motorcycle and the front wheel detection time T. Even when the vehicle speed increases, the front wheel detection time T and the axle distance correspondence time tn both become constant, and are constant. Even when the vehicle speed decreases, the front wheel detection time T and the axle distance correspondence time tn. Is constant because both become longer. Therefore, the threshold value K is constant without being affected by the vehicle speed, and it is possible to remove the two-wheeled vehicle sensing signal by utilizing this.

The number signal 6 after removal of the two-wheeled vehicle output from the relative value discrimination processing unit 5 is output to the traffic volume measuring unit 7 where the traffic volume per unit time is integrated. Then, the traffic volume data 8 is stored in the traffic volume storage unit 9, and is displayed on a display device or printed out on a recording sheet as needed.

As described above, according to the present embodiment, the contact type vehicle sensor 1 having the band-shaped switch 1 circuit 2 built therein is used, and the difference between the axle distances of the automobile and the motorcycle on which the sensor 1 is stepped on is used as a basis. In addition, since the relative value determination processing unit 5 removes the detection signal of the two-wheeled vehicle, it is possible to obtain highly reliable traffic volume data. The number of motorcycles can be measured by counting the number of times of removal.

(Embodiment 2) Next, a second embodiment of the present invention will be described. FIG. 4 is a block diagram showing the configuration of a traffic volume measuring device according to the second embodiment of the present invention. FIG.
21 is a contact type vehicle sensor for one lane,
It is placed at a right angle to the approaching direction of vehicles on the road.
Reference numeral 22 is a strip-shaped switch 2 circuit including two switches (1) and (2) built in the contact type vehicle sensor 21. An AND circuit 23 is connected to the switch 2 circuit 22. A sensing AND signal 24 is output from the AND circuit 23 when both switches in the switch 2 circuit 22 are stepped on at the same time. Reference numeral 25 is a main body of the measuring device, 26 is a relative value discrimination processing unit for removing the parallel running two-wheeled vehicle from the sensed AND signal 24, 27 is the number signal after the parallel running two-wheeled vehicle is removed, and 28 is the integration of the traffic volume per unit time. A traffic volume measuring unit 29, traffic volume data 29, and a traffic volume accumulating unit 30.

Next, the operation of this embodiment will be described with reference to the relationship between the vehicle and the sensing signal shown in FIG. Switch 2 circuit 22 of contact type vehicle sensor 21 installed on the road
The two switches (1) and (2) are installed so as to be separated by a distance that does not allow a single-running two-wheeled vehicle to step on the vehicle at the same time, and a distance that any vehicle will always step on at the same time. Therefore, since the single-wheeled two-wheeled vehicle depresses either one of the switches, the AND circuit 23 detects
Since the ND signal 24 is not output and both switches are always depressed in the case of a car, the AND circuit 23 outputs the sensing AND signal 24, and the measuring device main body 25
Is input to the relative value determination processing unit 26. However,
If two wheels are running side by side and both front wheels step on both switches at exactly the same time, AND
Since the sensing AND signal 24 is output from the circuit 23, the relative value discrimination processing unit 26 discriminates between a parallel running two-wheeled vehicle and an automobile having no difference in the entry time of the front wheels in the same manner as in the first embodiment. To do.

FIG. 6 shows a processing procedure in the relative value discrimination processing section 26. In FIG. 6, when there is a first sensing AND signal from the front wheels (step 31), the sensing time T is measured (step 32). 2 by the rear wheel
When the sensing AND signal for the second time is received (step 33), the time tn corresponding to the inter-axle distance is measured (step 34). Then, it is judged whether tn / T is larger or smaller than a predetermined threshold value K (step 35), and if smaller, it is judged that the vehicle is a parallel running two-wheeled vehicle (step 36).
No vehicle number signal is output to (step 37), and if it is large, it is determined to be an automobile (step 38), and a vehicle number signal is output to the traffic volume measuring unit 28 (step 39).

The number-of-vehicles signal 27 after removal of the parallel running two-wheel vehicle output from the relative value discrimination processing unit 26 is output to the traffic volume measuring unit 28, where the traffic volume per unit time is integrated. Then, the traffic volume data 29 is stored in the traffic volume storage unit 30, and is displayed on a display device or printed out on a recording sheet as needed.

As described above, according to the present embodiment, the contact type vehicle sensor 21 having the strip-shaped switch 2 circuit 22 built therein is used, and the single-run two-wheeled vehicle in which the sensor 21 is stepped is an AN.
The parallel running two-wheeled vehicle is removed by the D circuit 23, and the parallel running two-wheeled vehicle whose front wheels have entered the sensor 21 at the same time is distinguished by the relative value determination processing unit 26 based on the difference in the axle distance. Since only the sensing signal by is removed, reliable traffic data can be obtained.

In the present embodiment, as shown in FIG. 7, the contact type vehicle sensor 21 is prepared for multiple lanes and the same processing as in the present embodiment is performed for each lane, so that simultaneous traffic in multiple lanes is possible. It is possible to measure quantity. That is,
The traffic volume measuring unit 28 recognizes each lane or whether each lane is an up lane or a down lane in advance, so that it is possible to measure the traffic volume for each vertical direction.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 8 is a block diagram of a traffic volume measuring device according to the third embodiment of the present invention. In FIG.
Reference numeral 41 denotes a contact type vehicle sensor, which uses a known belt type contact type vehicle sensor, or a contact which incorporates the belt type switch 1 circuit used in the first embodiment or the belt type switch 2 circuit used in the second embodiment. Type vehicle sensor is used, and it is arranged at a right angle to the approaching direction of the vehicle on the road. 42
Is a vehicle detection signal generated when the vehicle depresses the contact type vehicle sensor 41. Reference numeral 43 is a measuring device main body, 44 is a relative value determination processing unit for removing a detection signal from a vehicle other than an automobile and a duplicate signal by a six-wheel vehicle such as a truck or a dump truck from the vehicle detection signal 42, and 45 is a signal after the duplicate signal is removed. Is a traffic volume measuring unit for integrating traffic volume per unit time, 47 is traffic volume data, and 48 is a traffic volume storage unit.

Next, the operation of this embodiment will be described with reference to the relationship between the six-wheel vehicle and the sensing signal shown in FIG. When the six-wheeled vehicle depresses the contact type vehicle sensor 41 installed on the road, the vehicle sensor 41 operates and outputs a vehicle detection signal 42. This sensing signal 42 is attached to one six-wheel vehicle,
The first wheel 51, the second wheel 52, and the third wheel 53 generate sensing signals a total of three times. The relative value determination processing unit 44 of the measuring device main body 43 selects the first
Ratio t1 / of the time t1 corresponding to the inter-axle distance between the first wheel 51 and the second wheel 52 with respect to the detection time T1 by the wheel 51.
Second with respect to T1 and the detection time T2 of the second wheel 52
Axle distance correspondence time t between the wheel 52 and the third wheel 53
A six-wheel vehicle is sensed by comparing the ratio t2 / T2 of 2 with a predetermined threshold value K. Here, the threshold value K is obtained theoretically and experimentally, and t2
It is set within the range of / T2 <K> t1 / T2.

FIG. 10 shows a processing procedure in the relative value discrimination processing section 44. This process can be similarly applied to a vehicle having two front wheels and one rear wheel. In FIG. 10, first, when there is a first detection signal from the first wheel 51 (step 61), the detection time T1 of the first wheel 51 is measured (step 62). Then the second wheel 52
When there is a second sensing signal due to (step 63), the time t1 corresponding to the inter-axle distance from the first wheel 51 to the second wheel 52 is measured (step 64). Then, it is determined whether or not t1 / T1 is larger or smaller than a predetermined threshold value K (step 65). If smaller, it is determined that the vehicle is not an automobile, and the detection signals of the first and second wheels 51 and 52 are detected. Is disregarded and the process ends (step 73). If it is larger, the vehicle is judged to be an automobile, the detection signal of the first wheel 51 is confirmed (step 66), and the detection time T2 of the second wheel 52 is measured (step 67). Then 3 by the third wheel 53
If there is a sensing signal for the second time (step 68), the second wheel 5
The time t2 corresponding to the inter-axle distance from the second wheel to the third wheel 53 is measured (step 69). Then, it is determined whether t2 / T2 is larger or smaller than a predetermined threshold value K (step 70). If smaller, it is determined that the vehicle is not an automobile, and the detection signal of the third wheel 53 is ignored. Is completed (step 74). If it is larger, it is determined to be the third wheel of the six-wheeled vehicle, the vehicle is confirmed as one vehicle (step 71), and a number signal is output to the traffic volume measuring unit 46 (step 7).
2).

The number-of-vehicles signal 45 from which the duplicate signal has been removed, which is output from the relative value discrimination processing unit 44, is output to the traffic volume measuring unit 46, where the traffic volume per unit time is integrated. And
The traffic volume data 47 is stored in the traffic volume storage unit 48, and is displayed on a display device or printed out on a recording sheet as needed.

As described above, according to the present embodiment, the belt-shaped contact type vehicle sensor 21 is used, and the relative value of the detection signal from the vehicle other than the automobile that has stepped on the sensor 21 and the duplicated signal from the six-wheeled vehicle is determined. Since it is removed by the processing unit 44, highly reliable traffic volume data can be obtained.

In the present embodiment, by repeating the same processing, it is possible to eliminate the duplicated signals from vehicles that exceed six wheels and measure them as one vehicle. Further, the threshold value K can be set to a value different from that corresponding to the inter-axle distance between the front and rear wheels by making it correspond to the inter-axle distance between the front wheels or the rear wheels.

[0027]

As is apparent from the above embodiments, the present invention can reliably exclude a two-wheeled vehicle from the traffic volume measurement, reliably distinguish a parallel-running motorcycle from an automobile, and exclude a parallel-running two-wheel vehicle from the traffic volume measurement. Therefore, even a vehicle having six or more wheels can be reliably measured as one unit, and a traffic volume measuring device with high data reliability can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a traffic volume measuring device according to a first embodiment of the present invention.

FIG. 2 is a timing chart showing the relationship between the vehicle and the sensing signal in the first embodiment.

FIG. 3 is a flowchart of a relative value determination processing unit according to the first embodiment.

FIG. 4 is a block diagram showing a configuration of a traffic volume measuring device according to a second embodiment of the present invention.

FIG. 5 is a timing chart showing the relationship between the vehicle and the sensing signal in the second embodiment.

FIG. 6 is a flowchart of a relative value determination processing unit according to the second embodiment.

FIG. 7 is a block diagram showing another configuration of the traffic volume measuring device according to the second embodiment.

FIG. 8 is a block diagram showing a configuration of a traffic volume measuring device according to a third embodiment of the present invention.

FIG. 9 is a timing chart showing the relationship between a six-wheel vehicle and a sensing signal in the third embodiment.

FIG. 10 is a flowchart of a relative value determination processing unit according to the third embodiment.

[Explanation of symbols]

 1, 21, 41 Contact type vehicle sensor 2 Switch 1 circuit 3, 42 Vehicle detection signal 4, 25, 43 Measuring device main body 5, 26, 44 Relative value discrimination processing unit 6, 27, 45 Number signal 7, 28, 46 Traffic Traffic measurement unit 8, 29, 47 Traffic data 9, 30, 48 Traffic storage unit 22 Switch 2 circuit 23 AND circuit 24 Sensing AND signal

Claims (5)

[Claims] 1. A contact type vehicle sensor which is installed on a road and outputs a vehicle detection signal according to the pedaling pressure of the front and rear wheels of the vehicle, and time difference information corresponding to the distance between the front and rear axles in the vehicle detection signal output from the vehicle sensor. A traffic volume measuring device including a measuring device main body for determining the type of a vehicle. 2. The traffic volume measurement according to claim 1, further comprising means for removing a vehicle detection signal from the two-wheeled vehicle based on the time difference information corresponding to the inter-axle distance, using a contact type vehicle sensor having a band-shaped switch 1 circuit built therein. apparatus. 3. A contact type vehicle sensor having a band-shaped switch 2 circuit incorporated therein, and sensing AND from the vehicle sensor.
The traffic volume measuring device according to claim 1, further comprising means for removing a vehicle detection signal from the single-running motorcycle and the parallel-running motorcycle based on the signal and the time difference information corresponding to the inter-axle distance. 4. The traffic volume measuring device according to claim 3, wherein the contact type vehicle sensor is arranged over multiple lanes. 5. A means for detecting and eliminating a duplicate vehicle detection signal from a vehicle having a plurality of wheels for front wheels and / or rear wheels by detecting the time difference information between the front and rear wheels corresponding to the inter-axle distance. The traffic volume measuring device described in 1.