JPH07225891A - Pedal for vehicle type deciding device - Google Patents

Abstract

PURPOSE:To provide a compact, light-weight and inexpensive pedal for a vehicle type deciding device which can measure the shaft weight, the number of shafts, the tread, etc., by means of a small number of parts. CONSTITUTION:A fare collection system of toll roads includes a vehicle separator consisting of the photoelectric switches which are placed opposite to each other centering on an entry road, a pedal 2 which has a pair of oblong recess holes and buried into a road surface 4 under the optical axis of the vehicle separator by crossing the surface 4, a shaft weight detecting parts 18a and 18b which has the oblong pressure plates in the upper end openings of the recess holes of the pedal 2 and consists of plural pressure-sensitive sensors placed symmetrically at the right and left parts of the lower faces of the pressure plates, a tread measuring means which measures the tread based on the ratio between the signal outputs received from the pressure-sensitive sensors of both parts 18a and 18b, and a shaft weight measuring means which measures the shaft weight by adding together the signal outputs of the sensors of parts 18a and 18b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a tread plate of a vehicle type identification device applied to a toll road toll collection system.

[0002]

2. Description of the Related Art Generally, in a toll collection system on a toll road or a parking lot, a vehicle type discriminating device is provided for discriminating a vehicle type of a passing vehicle. In a toll collection system on a toll road, conventionally, a vehicle 1 travels on a road surface 4 in a direction indicated by an arrow A, as shown in FIG.
The vehicle type identification device 5 is composed of optical vehicle separators 3a and 3b which are installed opposite to each other with a vehicle approach path in between, and a tread 2 which is embedded in a road surface 4 below the optical axis. This tread has the number of axles, number of wheels, and
Measure the vehicle type identification factors such as axle load and tread. In this type of vehicle discriminating apparatus, as shown in the horizontal cross-sectional view of FIG. 7 and the plan view of FIG. 8, a resistance contact body 9, a flat contact body 10, an axle load sensor 11, etc. are arranged on the tread plate 2 (special feature). Fair 4-237
No. 31). This is because when the vehicle passes through the tread plate, the tread plate of the elastic body is bent by the load of the vehicle, the contacts of each flat contact body move in sequence, and the resistance of the resistance contact body 9 changes as shown in FIG. The vehicle type discriminating elements such as the tread, the number of wheels, the number of axles, etc. are measured due to the change of the resistance due to the contact point, and the axle load of the passing vehicle is detected by the axle load sensor using the piezoelectric element.

[0003]

However, in this type of tread for vehicle type discrimination, the detector mounted on the tread is a flat contact for axis number detection, a resistive contact for tread detection, an axle load sensor, etc. Since a large number of types and a large number of detectors are required for each application, the tread becomes large, the weight increases, and the cost also increases.

The present invention has been proposed in view of the above circumstances, and it is an object of the present invention to provide a tread plate for a vehicle type identification device which is small in size, light in weight, and inexpensive in which the axial load, the number of axes, the tread, etc. can be measured with a small number of parts. To aim.

[0005]

To this end, the present invention relates to a toll road toll collection system, which comprises a vehicle separator comprising photoelectric switches installed opposite to each other with an approach road in between, and the vehicle separator. Provided on the road surface under the optical axis so as to cross it, and provided with a tread plate having left and right rectangular recessed holes, and a rectangular pressure receiving plate for closing the upper end openings of the recessed holes of the tread plate, respectively. Axle load detection section consisting of pressure-sensitive sensors attached respectively to the left and right sides of the lower surface of the, based on the ratio of the signal output from each pressure-sensitive sensor, tread measuring means for measuring the tread of the approaching vehicle, each of the above A shaft load measuring means for measuring a shaft load by adding signal outputs from the pressure-sensitive sensor is provided.

[0006]

According to such a structure, when the vehicle passes over the tread, the wheels 14 first move, as shown in FIGS.
One of the front axle load detectors 18b is depressed, and then the other axle load detector 18a is depressed. As a result, a signal proportional to the tread pressure load is output from the pressure-sensitive sensor of the axle load detection section in sequence according to the tread pressure order of the wheels. I understand. Further, while the vehicle is being detected by the vehicle separator, the number of axes of the passing vehicle is detected based on the forward / backward traveling information of the vehicle. Further, when the vehicle passes over the tread plate, the pressure receiving plate is bent by the load of the vehicle, and the tread is calculated from the position of the pressure sensitive sensor fixed to the lower surface of the pressure receiving plate and the treading position, as described later.

[0007]

1 is a plan view of the present invention, FIG. 2 is a sectional view taken along the line II--II of FIG. 1, and FIG. FIG. 4 is a schematic diagram showing the relationship with mechanical quantities such as reaction force and moment.
Block diagram showing a calculation circuit of tread and axle load by
FIG. 5 is an overall system diagram showing a toll fee collection system having the structure of FIGS.

First, in FIGS. 1 and 2, a pair of left and right rectangular recessed holes extending in the left-right direction are formed in the tread 2, and each recessed hole has a rectangular box-shaped axial load detecting portion 18 of the same structure.
Supports 16 and 16 which are support boxes containing a and 18b are mounted. The axial load detectors 18a and 18b are arranged on the left and right, and are arranged so as to be offset from each other in the front and rear. The axial load detectors 18a and 18b have rectangular pressure receiving plates 1 whose left and right ends are fixed to the left and right ends of the support 16 having a rigid structure.
Pressure-sensitive sensors 17a and 17b are arranged at a fixed distance a from both ends of the lower surface of No. 5, respectively. Usually, strain gauges are used for the pressure sensitive sensors 17a and 17b. In addition, as shown in FIG.
It is mounted in each recessed hole reinforced by a rigid horizontal rectangular substrate 30, and its upper surface is entirely covered with a common rectangular rubber plate 19.

Now, as shown in FIG. 3, it is assumed that a load W due to the pedal pressure of the vehicle is applied to the pressure receiving plates of the left and right axle load detecting portions. Here, M; moment R; reaction force l; distance from load point to pressure receiving plate a; distance from pressure sensitive sensor to end of pressure receiving plate E; longitudinal elastic modulus Z; section coefficient ε; strain, same figure Focusing on the pressure receiving plate 15 on the left side, M ₁ = R ₁ a ε ₁ = (σ ₁ / E) = (M ₁ / EZ) = (R ₁ a / E
Z) = W {l ₂ / (l ₁ + l ₂ )} · (a / EZ) M ₂ = R ₂ a ε ₂ = (σ ₂ / E) = (M ₂ / EZ) = (R ₂ a / E
Z) = W {l ₁ / (l ₁ + l ₂ )} · (a / EZ) Therefore, the relationship of the following expression (1) is established. (L ₂ / l ₁ ) = (ε ₂ / ε ₁ ) ... (1) Here, M = σZ, σ = Eε That is, when a variable load is applied to the pressure receiving plate due to entry of the vehicle, both senses Since the pressure sensors 17a and 17b are simultaneously applied, the strain ratio (ε ₁ / ε ₂ ) is constant. Therefore, by measuring the strain ε, l ₁ and l ₂ can be obtained from the relation of the equation (1). Since the total distance L is a known amount, the tread 12 is calculated. The axial amount can also be calculated by adding the reaction force R.

In such a structure, the support bodies 16 each have a rectangular box shape for the purpose of weight reduction and rigidity, and the rubber plate 19 allows rainwater to enter from between the pressure receiving plate 15 and the support body 16. This is to prevent the above, and the reason why the axial load detectors 18a and 18b are arranged to be shifted forward and backward is to determine whether the approaching vehicle is moving forward or backward depending on the timing front-rear relationship.

FIG. 4 is a calculation system diagram of the axial load and the tread. The strain of the pressure sensitive sensor 17 of each pressure receiving plate 15 is amplified by the strain gauge amplifier 20, passes through the A / D converter 21, and
The tread pressure position of the tire can be calculated by the tire position calculation unit 22, and the tread, shaft load, etc. can be obtained by the tread / axial load calculation unit 23.

FIG. 5 is a schematic diagram of the fee collection system, and FIG.
Based on the tread, axle load, number of axles, and number of vehicles calculated in, the vehicle type is determined and a toll ticket is issued. Here, 3a and 3b are vehicle separators, 24 is a number detecting unit, and 25 is a vehicle type discriminating unit.

[0013]

According to such a tread, since the vehicle type discrimination elements such as tread, axle load, number of axles, and the number of vehicles are required only by the pressure-sensitive sensor, the number of parts is small, the size is small, and the vehicle is inexpensive. Since a stable and accurate value is required even if a fluctuating load is generated due to entry, reliability is improved and vehicle type discrimination accuracy of a toll system such as a toll road is improved. By the way, conventionally, in order to detect vehicle type discriminating elements such as tread, axle load, number of axles, number of vehicles, etc., various and many detectors have been used for each application.

In short, according to the present invention, in a toll road toll collection system, a vehicle separator constituted by photoelectric switches installed facing each other across an approach road, and a road surface below the optical axis of the vehicle separator. And a rectangular pressure receiving plate that is embedded in a shape that traverses the left and right rectangular recessed holes, and a rectangular pressure receiving plate that closes the upper end openings of the recessed holes of the treading plate. Axle load detection unit consisting of a pressure-sensitive sensor attached to each, based on the ratio of the signal output from each of the pressure-sensitive sensors, tread measuring means for measuring the tread of the approaching vehicle, and from each of the pressure-sensitive sensors A compact and lightweight vehicle type identification device capable of measuring the shaft load, the number of shafts, the tread, etc. with a small number of parts by including the shaft load measuring means for adding the signal outputs to measure the shaft load. Since obtaining the treadle, the present invention is extremely useful industrially.

[Brief description of drawings]

FIG. 1 is a plan view showing a tread plate according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line II-II of FIG.

3 is a mechanical schematic view of the tread plate of FIG. 2 taken along a line III-III.

FIG. 4 is a block diagram showing a tread and axle load calculation circuit using the tread of FIG. 1.

FIG. 5 is an overall system diagram showing a pay fee collection system according to the present invention having the structure of FIGS.

FIG. 6 is a schematic perspective view showing a conventional toll collection system on a toll road.

7 is a vertical cross-sectional view of the tread plate of FIG.

FIG. 8 is a plan view of FIG.

9 is a partially enlarged view of FIG.

[Explanation of symbols]

 1 vehicle 2 treads 3, 3a, 3b vehicle separator 4 road surface 5 vehicle type identification device 12 tread 13 recessed hole 14 wheel 15 pressure plate 16 support body 17, 17a, 17b pressure sensor (strain gauge) 18a, 18b axle load detection unit 19 Rubber plate 20 Strain gauge amplifier 21 A / D converter 22 Tire position calculation unit 23 Tread, axle load calculation unit 24 Number detection unit 25 Vehicle type determination unit 26 Passage ticket processing unit

Claims (1)

[Claims] 1. In a toll road toll collection system,
A vehicle separator composed of photoelectric switches installed opposite to each other across an approach road, and a tread plate which is embedded in a road surface below the optical axis of the vehicle separator so as to cross the same, and which has rectangular recessed holes on the left and right respectively. And a rectangular pressure receiving plate that closes the upper end openings of the recessed holes of the tread plate, respectively, and an axial load detecting unit including pressure-sensitive sensors attached to the left and right portions of the lower surface of each pressure receiving plate, and Based on the ratio of the signal output from the pressure sensitive sensor, the tread measuring means for measuring the tread of the approaching vehicle, and the axle load measuring means for measuring the axle load by adding the signal output from each of the pressure sensitive sensors. A tread plate for a vehicle type identification device characterized in that