JPH11232586A - Wheel interval calculating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel interval calculating device which can calculate a wheel interval with high precision. SOLUTION: The interval L between the front and rear wheels of a vehicle is calculated from, for example, L=(L1 +L2 )/2 (where L1 =D×t3 /t and L2 =D×t4 /t2 ) on the basis of the time interval t1 from the detection of the front wheels by an upstream side 1st shaft weigher to the detection by a 2nd shaft weigher, the time interval t2 from the detection of the rear wheels by the 1st shaft weigher to the detection by the 2nd shaft weigher, the time interval t3 from the detection of the front wheels by the 1st shaft weigher to the detection of the rear wheels by the 1st shaft weigher, the time interval t4 from the detection of the front wheels by the 2nd shaft weigher to the detection of the rear wheels bathe 2nd shaft weigher, and the installation interval D between the shaft weighers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for calculating a distance between wheels of a passing vehicle, that is, a distance between wheels.

[0002]

2. Description of the Related Art In terms of security management of roads and bridges, the weight of vehicles traveling there is limited by a vehicle restriction order. In this vehicle restriction order, for example, the axle spacing is 5.5 m.
In the following, the weight is limited according to the axle interval, such as the limit weight is 22t or less, when the limit weight is 20t or less and the axle interval is 7m or less.

Therefore, in order to detect a vehicle violating the vehicle restriction order, it is necessary to measure an axle interval, that is, a wheel interval.

Conventionally, as shown in FIG. 7, two axle meters 5, 6 are buried on a road 4 along the traveling direction of a vehicle as shown in FIG. The wheel spacing is calculated as follows.

[0005] That is, the installation interval of the first axlemeter 5 on the upstream side in the traveling direction of the vehicle, the second axlemeter 6 on the downstream side, and the installation interval of the two axleometers 5, 6 are D. As shown in the detection outputs of the dual axle meters 5 and 6 in FIG.
The time interval from the detection at the time t1 to the detection at the second axle scale 6 is t ₁ , from the time when the rear wheel of the vehicle is detected by the first axle load meter 5 to the time at which it is detected by the second axle load meter 6 t ₂ the time interval, t ₃ the time interval between the front wheels of the vehicle the rear wheels from being detected by the first axle load meter 5 is detected by the first axle weight detecting 5, the front wheel is the second axis of the vehicle Assuming that a time interval from when the weight is detected by the weight meter 6 to when the rear wheel is detected by the second axle weight meter 6 is t ₄ , the wheel interval L of the vehicle is an average speed when the front wheels travel through the installation interval D. L = D × t ₃ / t using (D / t ₁ ) and the time interval t ₃ of detection of the front wheel and the rear wheel corresponding to the wheel interval by the first axle meter 5 on the upstream side. ₁ Alternatively, with use of the average speed at which the rear wheels is traveling the installation interval D (D / t _2), the rear and front wheel corresponding to the wheel spacing of the second axle weight detecting 6 of the downstream side wheel Using the time interval t ₄ of the detection is calculated as _{L = D × t 4 / t} 2.

[0006]

As described above, the prior art which calculates the wheel interval using the average speed of only the front wheel or the rear wheel and the time interval of detection of the front wheel and the rear wheel by the axle meter only on the upstream or downstream side. In the example, when there is a change in the traveling speed of the vehicle at the measurement point, there is a disadvantage that an error that occurs is increased.

[0007] The present invention has been made in view of the above points, and has as its object to be able to calculate a wheel interval with high accuracy.

[0008]

In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, according to the first aspect of the present invention, the distance between the front wheel and the rear wheel of the vehicle is determined based on the detection output of at least two wheel detecting means for detecting the presence of the wheel of the passing vehicle. A time interval from when one of the two wheel detecting means disposed along the traveling direction of the vehicle detects the front wheel to when the other detects the front wheel, A time interval from the detection of the rear wheel to the other wheel detecting the rear wheel, a time interval from the detection of the front wheel by the wheel detection means to the detection of the rear wheel, and the detection of both wheels. Calculation means is provided for calculating the distance between the front wheel and the rear wheel based on the distance between the means.

[0010] According to a second aspect of the present invention, there is provided a wheel spacing calculating device.
A wheel interval calculating a distance between a front wheel and a rear wheel of the vehicle based on a detection output of at least two wheel detection means for detecting the presence of a wheel of the passing vehicle and a detection output of the vehicle detection means for detecting the presence of the vehicle A calculating device that determines a first detected wheel as a front wheel and determines a last detected wheel as a rear wheel during a period in which the presence of the vehicle is detected; Based on the result, calculating means for calculating the interval between the wheel determined as the front wheel and the wheel determined as the rear wheel, the calculating means,
A time interval from when one of the two wheel detecting means disposed along the traveling direction of the vehicle detects a wheel determined to be a front wheel to when the other detects the wheel, the one is determined to be a rear wheel. The time interval between the detection of the wheel that has been detected and the detection of the wheel by the other, and the detection of the wheel determined as the front wheel by the respective wheel detection means after the detection of the wheel determined to be the rear wheel by the respective wheel detection means. The interval between the front wheel and the rear wheel is calculated based on each time interval and the distance between the two wheel detecting means.

According to a third aspect of the present invention, there is provided a wheel spacing calculating apparatus,
In the configuration according to claim 1 or 2, the wheel detecting means is an axleometer buried in a road.

According to the first aspect of the present invention, the average speed based on both the front wheel and the rear wheel can be used, and the time interval between the detection of the front wheel and the rear wheel by the wheel detecting means on the upstream side in the traveling direction and the downstream speed can be used. The distance between the wheels can be calculated by using both time intervals of the time intervals of the detection of the front wheel and the rear wheel by the wheel detection means on the side, so that the average speed of only the front wheel or the rear wheel and the wheel detection means on the upstream or downstream side It is possible to calculate the wheel interval with higher accuracy than the conventional example in which the wheel interval is calculated using the time interval of the detection of the front wheel and the rear wheel only by using the time interval.

According to the second aspect of the present invention, in addition to the functions and effects of the first aspect of the present invention, the front wheel and the rear wheel are determined by the determining means using the detection output of the vehicle detecting means for detecting the presence of the vehicle. Since the wheel spacing is calculated based on the determination, the wheel spacing between the farthest front and rear wheels can be calculated, even for a special vehicle having three or more axes such as a trailer or a bus, for example. Even if a vehicle approaches and approaches the measurement point continuously, the wheel interval between the front wheel and the rear wheel can be calculated for each vehicle.

According to the third aspect of the present invention, since the axle meter is used as the wheel detecting means, the wheel spacing, that is,
Along with the calculation of the distance between the shafts, the shaft weight according to the calculated distance between the shafts can be measured, and it can be easily determined whether or not the measured vehicle violates the vehicle restriction order.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a system including a wheel interval calculating device according to one embodiment of the present invention.

(Embodiment 1) In this embodiment, a distance L between a front wheel 2 and a rear wheel 3 of a vehicle 1 running on a road 4 is calculated. The first and second axle meters 5, 6 as two wheel detecting means are buried at a fixed interval D along the traveling direction indicated by the symbol. As shown in the plan view of FIG. 2, it is buried so as to extend in the width direction of the road 4.

The wheel interval calculating device 7 of this embodiment is
A microcomputer as a calculating means for calculating a wheel interval is built in, and a front wheel 2 and a rear wheel 3 of a running vehicle 1 are provided.
In order to calculate the wheel interval L with high accuracy, the following is performed.

That is, FIG. 3 is a time chart of the detection output of the first and second axle meters 5, 6 by the front wheels and the rear wheels of the running vehicle, and FIG. FIG. 3B shows the detection output of the first axle meter 5 on the upstream side, and FIG. 2B shows the detection output of the second axle meter 6 on the downstream side in the traveling direction of the vehicle.

Here, the time interval from when the front wheel 2 of the vehicle 1 is detected by the first axle meter 5 to when it is detected by the second axle meter 6 is t ₁ , and the rear wheel 3 of the vehicle 1 is the first wheel The time interval from detection by the axle meter 5 to detection by the second axle meter 6 is t ₂ ,
After the front wheels 2 of the vehicle 1 are detected by the first axle weight meter 5, the rear wheels 3
Is a time interval until is detected by the first axle meter 5, the rear wheel _{3 of} the vehicle 1 is detected by the second axle meter 6 after the front wheel 2 of the vehicle 1 is detected by the second axle meter 6. If the time interval between the t _4, and calculates the wheel distance L between the front wheels 2 and rear wheels 3 by the following equation.

L = (L ₁ + L ₂ ) / 2 where L ₁ = D × t ₃ / t ₁ L ₂ = D × t ₄ / t ₂ .

In this embodiment, the front wheels 2 are arranged at intervals D
Is calculated using the average speed (D / t ₁ ) when traveling on the vehicle and the time interval t ₃ of detection of the front wheel 2 and the rear wheel 3 corresponding to the wheel interval by the first axle load meter 5 on the upstream side. the wheel interval L _1,
The average speed (D /
t ₂ ) and the wheel interval L ₂ calculated using the time interval t ₄ of the detection of the front wheel 2 and the rear wheel 3 corresponding to the wheel interval by the second axle meter 6 on the downstream side as the final value. Is to calculate a typical wheel interval L.

As described above, the average speed of the front wheel 2, the average speed of the rear wheel 3, the time interval of detection of the front wheel 2 and the rear wheel 3 corresponding to the wheel interval by the first axle meter 5 on the upstream side, and Since the wheel interval between the front wheel 2 and the rear wheel 3 is calculated based on the detection time interval between the front wheel 2 and the rear wheel 3 corresponding to the wheel interval by the second axle meter 6 on the downstream side, the front wheel 2 or the rear wheel The average speed of only one of the wheels 3 and the axle weights 5, 6 on the upstream or downstream side
Error in the case where there is a change in the speed of the vehicle as compared with the conventional example in which the wheel interval between the front wheel and the rear wheel is calculated based on the time interval of detection of the front wheel 2 and the rear wheel 3 by only one of the two. Can be reduced, and highly accurate calculation of the wheel interval can be performed.

In FIG. 3 described above, the wheel interval L is longer than the installation interval D of the axle meters 5 and 6, and the second axle weight is set before the rear wheel 3 is detected by the first axle meter 5. Although the case where the front wheel 2 is detected by the total 6 is shown, the wheel interval L is shorter than the installation interval D of the axle meters 5 and 6 as shown in FIG. Even if the rear wheel 3 is detected by the first axle load meter 5 before is detected, the wheel interval L is similarly calculated by the above-described calculation formula.

FIG. 5 is a flowchart for explaining the above operation. First, it is determined whether or not the front wheel 2 is detected by the first axle weight meter 5 (step n1). It is determined whether or not the front wheel 2 is detected by the weight meter 6 (step n2).
A time interval t ₁ from the detection by the axle meter 5 to the detection by the second axle meter 6 is measured (step n3), and it is determined whether or not the first wheel 5 has detected the rear wheel 3. Judgment (step n
4), when it is detected, measures the time interval t ₃ to the front wheels 2 is a rear wheel 3 is detected by the first axle weight detecting 5 from being detected by the first axle weight detecting 5 (step n5), Second axle weight 6
To determine whether the rear wheel 3 has been detected (step n).
6) When it is detected, the time interval t ₂ from when the rear wheel 3 is detected by the first axle meter 5 to when it is detected by the second axle meter 6, the front wheel 2 is detected by the second axle meter 6. the detected rear wheel 3 measures the time interval t ₄ until it is detected by the second axle weight detecting 6 (step n7), the interval t ₁ measured time ~t ₄ and axle weight detecting 5 and 6 of The wheel interval L is calculated from the installation interval D according to the above-described formula, and the process is terminated (step n8).

In step n2, when the front wheel 2 is not detected by the second axle meter 6, it is determined whether the rear wheel 3 is detected by the first axle meter 5 (step n).
9), when it is detected, measures the time interval t ₃ to the front wheels 2 is a rear wheel 3 is detected by the first axle weight detecting 5 from being detected by the first axle weight detecting 5 (step n10), It is determined whether the front wheel 2 is detected by the second axle weight meter 6 (step n1).
1) When detected, a time interval t ₁ from when the front wheel 2 is detected by the first axle meter 5 to when it is detected by the second axle meter 6 is measured (step n12), and the rear wheel 3 is It is determined whether or not the detection is performed by the second axle meter 6 (step n13). When the detection is performed, the rear wheel 3 is detected by the first axle meter 5 and then detected by the second axle meter 6. time interval t ₂ up, the front wheel 2 is the rear wheel 3 is detected by the second axle load meter 6 measures the time interval t ₄ until it is detected by the second axle weight detecting 6 proceeds to step n8 ( Step n14).

In the above-described embodiment, as shown in the time chart of FIG.
That is, although the time interval was measured based on the timing at which the wheel approached the axleometer, as another embodiment of the present invention, for example, the fall of the detection output, that is, the wheel is separated from the axleometer Of course, the time interval may be measured based on the timing, or the time interval may be measured based on the timing at the center of the period during which the detection output is obtained.

(Embodiment 2) In the above embodiment, the front wheel 2
Average speed (D / t ₁₎ and the first axle weight detecting 5 on the upstream side and the front wheel 2 and the wheel distance L ₁ calculated by using the time interval t ₃ of the detection of the rear wheel 3, a rear wheel 3 as the average speed average of (D / t ₂₎ and the wheel distance L ₂ calculated by using the time interval t ₄ the detection of a front wheel 2 and rear wheels 3 of the second axle weight detecting 6 of the downstream Although the wheel interval L is calculated, as another embodiment of the present invention, the wheel interval L between the front wheel 2 and the rear wheel 3 may be calculated as follows.

That is, in this embodiment as well, the wheel interval L is calculated by using all of the above-mentioned time intervals t _{1 to} t ₄ and the installation intervals D of the axle meters 5 and 6. In the time (t ₁ + t ₂ ), which is the sum of the intervals t ₁ and t ₂ , the vehicle travels a distance 2D twice as long as the installation interval D, so that the average speed is 2D / (t ₁ + t _2). ), And multiplying this average speed by t ₃ + t ₄ means that the vehicle has traveled a distance 2L which is twice the wheel interval L. That is, {2D / (t ₁ + t ₂ )} × (t ₃ + t ₄ ) = 2L. Therefore, the wheel interval L is calculated by the following equation.

L = D × (t ₃ + t ₄ ) / (t ₁ + t ₂ ) The other structure is the same as that of the above-described embodiment.

Also in this embodiment, the average speed 2D / (t ₁ + t ₂ ) based on the front wheel 2 and the rear wheel 3 and the time for detecting the front wheel 2 and the rear wheel 3 by the first axle load meter 5 on the upstream side. Using the interval t ₃ and the time interval t ₄ of detection of the front wheel 2 and the rear wheel 3 by the second axle meter 6 on the downstream side, the front wheel 2 and the rear wheel 3 are used.
Is calculated, it is possible to reduce the error in the case where the speed of the vehicle changes, as compared with the conventional example, and it is possible to calculate the wheel interval with high accuracy.

(Embodiment 3) FIG. 6 is a schematic structural view corresponding to FIG. 1 of another embodiment of the present invention, and portions corresponding to FIG. 1 are denoted by the same reference numerals.

In this embodiment, for example, even in a special vehicle 8 having three or more axes such as a trailer or a bus, the wheel interval L between the farthest front wheel 2 and the rear wheel 3 can be calculated and the vehicle distance L can be calculated. In order to be able to calculate the wheel interval between the front wheel 2 and the rear wheel 3 for each vehicle even if the vehicle approaches the measurement point in close proximity, the following configuration is adopted.

That is, the installation intervals D of the axle meters 5 and 6 are set at relatively small intervals so as to be shorter than the wheel interval L of the vehicle, and at a position where the axle meters 5 and 6 reach the first axle weight meter 5 on the upstream side. Is equipped with a vehicle detection device 9 using, for example, a photoelectric sensor or an ultrasonic wave. When a vehicle is present in the detection area of the axle meters 5 and 6, the vehicle is detected and a vehicle detection signal is detected. It is configured to be provided to the calculation device 7 '.

The wheel interval calculating device 7 'determines the first wheel detected by each of the axle meters 5 and 6 during the period when the vehicle detection signal is being input, that is, the period when the vehicle is present. The microcomputer has a built-in microcomputer having a function as a judging means for judging the rear wheel 3 as a rear wheel 3 while judging that the front wheel 2 and the rear wheel 3 have been judged last. , The time intervals t _{1 to} t ₄ are measured in the same manner as in the above-described embodiment, and the wheel spacing between the farthest front wheel 2 and the rear wheel 3 in the same manner as in the above-described embodiment. L
Is calculated.

As described above, the front wheel and the rear wheel are respectively determined and the wheel interval between the front wheel and the rear wheel is calculated for each period in which the vehicle detection signal is given. The wheel spacing can be calculated with high accuracy, and even for a special vehicle 8 having three or more axes such as a trailer or a bus, the wheel spacing L between the farthest front wheel 2 and rear wheel 3 can be calculated, and Even if the vehicle continuously approaches the measurement point in close proximity, the wheel interval between the front wheel and the rear wheel can be calculated for each vehicle.

(Other Embodiments) Based on the detection output of each axle weight meter 5, 6, the axle weight is measured in the same manner as in the prior art, and the measured axle weight is added to the calculated wheel interval, that is, the axle weight. By making the distances correspond to each other, it may be determined whether or not the traveling vehicle violates the vehicle restriction instruction, and appropriate measures such as warning may be taken for the violating vehicle.

[0038]

As described above, according to the present invention, the average speed based on both the front wheel and the rear wheel, the time interval between the detection of the front wheel and the rear wheel by the wheel detecting means on the upstream side in the traveling direction, and the speed on the downstream side Since the interval between the wheels can be calculated by using all the time intervals of the detection of the front wheel and the rear wheel by the wheel detecting means,
Compared to the conventional example in which the average speed of only the front wheel or the rear wheel and the time interval between the detection of the front wheel and the rear wheel by only the upstream or downstream wheel detection means are used to calculate the interval between the wheels.
It is possible to calculate the wheel interval with high accuracy.

Further, the front wheel and the rear wheel are determined by the determining means using the detection output of the vehicle detecting means for detecting the presence of the vehicle, and the wheel interval is calculated based on the front wheel and the rear wheel. Even for special vehicles with three or more axes, it is possible to calculate the wheel spacing between the farthest front wheel and rear wheel, and for each vehicle, even if the vehicle approaches and continuously enters the measurement point. The distance between the wheel and the rear wheel can be calculated.

Further, since the axle meter is used as the wheel detecting means, the wheel distance, that is, the distance between the shafts can be calculated, and the shaft weight according to the calculated distance between the shafts can be measured. It is possible to easily determine whether or not the vehicle violates the vehicle restriction order.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a system including a wheel interval calculation device according to the present invention.

FIG. 2 is a plan view showing an installed state of the axle meter.

FIG. 3 is a time chart of the detection output of the axle load meter.

FIG. 4 is a time chart of the detection output of the axle load meter.

FIG. 5 is a flowchart for explaining the operation.

FIG. 6 is a schematic configuration diagram of another embodiment of the present invention.

FIG. 7 is a plan view showing an installed state of the axle meter.

FIG. 8 is a time chart of the detection output of the axle load meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Front wheel 3 Rear wheel 4 Road 5,6 First and second axle weight 7,7 'Wheel spacing calculating device 8 Special vehicle 9 Vehicle detecting device

Claims (3)

[Claims] 1. A wheel interval calculating device which calculates an interval between a front wheel and a rear wheel of a vehicle based on detection outputs of at least two wheel detecting means for detecting the presence of a wheel of a passing vehicle. A time interval from when one of the two wheel detecting means disposed along the traveling direction detects the front wheel to when the other detects the front wheel, and when the one detects the rear wheel, the other detects the rear wheel. A time interval until the detection, a time interval between each of the wheel detection means detecting the front wheel and a detection of the rear wheel, and a distance between the front wheel and the rear wheel based on the distance between the two wheel detection means. A wheel interval calculating device comprising a calculating means for calculating an interval between the wheels. 2. An interval between a front wheel and a rear wheel of a vehicle based on a detection output of at least two wheel detection means for detecting the presence of a wheel of a passing vehicle and a detection output of a vehicle detection means for detecting the presence of a vehicle. A wheel interval calculating device that calculates a first wheel detected as a front wheel and a last wheel detected as a rear wheel during a period in which the presence of the vehicle is detected; and Calculating means for calculating an interval between a wheel determined to be a front wheel and a wheel determined to be a rear wheel based on a determination result of the determining means, wherein the calculating means is arranged along a traveling direction of the vehicle. A time interval from when one of the two wheel detecting means detects a wheel determined to be a front wheel to when the other detects the wheel,
A time interval from when one of the wheels is determined to be a rear wheel to when the other detects the wheel, and when each of the wheel detecting means detects a wheel determined to be a front wheel, the wheel is determined to be a rear wheel. A wheel interval calculating device for calculating an interval between a front wheel and a rear wheel based on each time interval until each of the detected wheels is detected and a distance between both wheel detecting means. 3. The wheel interval calculating device according to claim 1, wherein said wheel detecting means is an axle meter embedded in a road.