JP2796026B2 - Vehicle axle load measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the axle load of a vehicle, and more particularly to a method for measuring the axle load while the vehicle is running.

[0002]

2. Description of the Related Art As a method of measuring an axle load while a vehicle is running, as shown in FIGS. 7 and 8, a photoelectric tube 1 is detected so as to detect a wheel 2 passing over an electric load detecting device 1. FIG.
One provided with a sensor such as 00 or a pressure switch 101 is known. In this method, the axle load of the vehicle is measured from the electric output of the detection device 1 when the passage of the wheel 2 is detected by the sensor.

[0003]

SUMMARY OF THE INVENTION In the conventional measuring method,
The electrical output related to the axle load can be obtained at only one point, and is susceptible to the influence of noise and output fluctuation, and therefore the measurement accuracy is poor. In addition, the photoelectric tube 100 and the pressure switch 1
Since a sensor such as 01 was required, the device became large-scale.

Accordingly, an object of the present invention is to provide a method capable of easily and accurately measuring the axle load of a vehicle without using a sensor.

[0005]

In order to achieve the above object, the present invention provides an electric load detecting device on a road surface on which a vehicle passes, and measures the axle load of the vehicle from the electric output of the detecting device. The method comprises the steps of:
Measuring the time until the weight detected value rests on loading plate of location consists of time when it reaches a certain trigger level below the trigger level, based on the half time elapsed this time, or <br /> one, in which to detect the axle load by averaging the weight value detected within a predetermined time set to equal intervals across it.

[0006]

According to the present invention, for example, the wheel is mounted on the load plate of the detecting device and the detected weight value is constant (trigger level).
It is stored and set in advance in a computer. The time from when the value reaches a predetermined value (the same trigger level) is measured, and a half elapsed time of this time is calculated. Extremely accurate measurement is performed by detecting the axle load by averaging the weight detection values within a predetermined time set at equal intervals on the basis of the elapsed time and sandwiching the elapsed time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIGS. 1 and 2, an electric load detecting device 1 is provided on a road surface on which a vehicle passes, and the axle load of the vehicle is measured from the electric output of the detecting device 1. The time from the time when the vehicle 2 starts to be mounted on the loading plate 3 of the detection device 1 to the time when the vehicle 2 ends
There detecting device 1 of the weight detected values listed in the loading plate 3 is fixed value, i.e. as to measure the time t ₁ from the time T ₁ when it reaches the trigger level T to time T _2, reduced below this trigger level T Then, a half elapsed time A of this time is calculated. Then detected axle load by averaging the weight detection value based on 1 elapsed time A half and this within a predetermined time t ₂ set at equal intervals across.

In the embodiment shown in FIGS. 1 and 2, not the time from the time 2a when the wheel 2 starts to be mounted on the loading plate 3 until the time 2d when the wheel 2 has finished descending, the wheel 2 is applied to the loading plate 3 of the detecting device 1. resting the weight detection value is the time from time T ₁ when it reaches the predetermined value or trigger level T to time T _2, reduced below this trigger level T was measured as t _1. The half elapsed time of this time t ₁ is the time point A in FIG. Then 1 elapsed time or the predetermined time t ₂ set equally spacing the reference and across which A time of 2 minutes wheel 2 is loading from the point 2b where the wheel 2 is moved completely rests loading plate 3 from the road surface Moment 2c when it starts to get on the road again from the board 3
Until the time. Averaged weight detection value within the time t ₂ for detecting the axle load with.

In FIG. 2, L indicates the length of the loading plate 3 of the detection device 1, and 1 indicates the length of the grounding surface of the wheel 2.
Reference numeral 4 in FIG. 2 indicates a strain gauge. The detecting device 1 using a load cell can be used instead of the strain gauge 4. As shown in FIG. 3 and FIG. 4, for example, as shown in FIGS. 3 and 4, the upper and lower peripheral portions 31 of the detecting device 1 using the strain gauge 4 are located below the side edges of the loading plate 3. Located on the drawing, left and right peripheral part 31
Are connected to the main body by four beams 32. Strain gauges 4 are provided on both sides of these beams 32 to detect the strain of the beams 32. Two pairs of strain gauges 4 are provided on one beam 32, a constant voltage is applied to each gauge 4, and when a load acts on the loading plate 3, the average of the sum of the voltages output from each pair of gauges 4. The value is amplified by the amplifier 5 and output.

The electric signal output from the electric load detector 1 is amplified by an amplifier 5 as shown in FIG.
Further, it is digitized by the analog / digital converter 6. Here, the digitized signal is sent to the computer 7, and at this time, a waveform as shown in FIG. 1 is sent.
The trigger level T shown in FIG. 1 is stored and set in the computer 7 in advance. Time T ₁ when the digital signal to the computer 7 has reached the lower side to the trigger level T
Then, the computer 7 starts storing digital signals in the memory 8. In time T ₂ when the digital signal reaches the higher side to the trigger level T computer 7 finishes the storage of coming to the input digital signal. Computer 7 calculates the time t ₁ from T ₁ to T _2, obtains the time midpoint A. The length L of the loading plate 3 with respect to time t _1, determine the time in consideration of the length l of the ground contact surface of the wheel 2 t _2. This time t ₂ is set so as to fall within the range where the wheel 2 is completely placed on the loading plate 3. With respect to the intermediate point A, an average value of the values of the input signals between the points 2b and 2c which are 1 / 2t ₂ before and after the intermediate point A is calculated, and the calculated value is output to a display or a printer.

FIG. 6 shows a specific example of installation, in which two electric load detectors 1 are installed at positions corresponding to the left and right wheels 2, and the axle load of the vehicle (right and left (Sum of the loads measured for the wheels).
In this configuration, the total weight of the vehicle can be measured by storing the axle weights and summing them after passing through all the axles. The data from the two detectors 1 is summed up in a summing box 9, and the output signal from the summing box 9 is packaged into an amplifier 5, an analog / digital converter 6, a computer 7, and a memory 8. It is sent to the indicator 10. When the left and right wheels 2 pass through the two electric load detection devices 1, the loads on the wheels 2 may be measured individually, and may be totaled after the measurement of all the wheels. In addition,
As a command method for summing the stored axle weights after passing through all the axes, the vehicle exit sensor 11 can be installed to detect the passage of the vehicle, and to perform the axle summation after the measurement is completed. . Alternatively, the card reader 12 is attached to the indicator 10.
Is connected, and a vehicle information card or the like is carried by each vehicle, and the reader 12 of the card is installed at a place where the vehicle driver can operate from the driver's seat, and the information stored in the card is read. If the number of vehicle axes is included in the information, the information of the number of axes is transmitted from the card reader 12 to the indicator 10 and stored. Here, all the wheels 2 pass on the detection device 1 and each axle weight is measured. When the measured axle weight becomes equal to the number of axles stored in advance, the measurement is terminated,
Each axis polymerization meter can also be performed.

The vehicle weight was actually measured in the configuration shown in FIG. The vehicle used was a 10-ton wheel having two front wheels and one rear wheel with 10 tons of weights loaded thereon. The length 1 of the ground contact surface of the wheels 2 was 220 mm, and the length L of the loading plate 3 was 650 mm.
The true weight of the above-mentioned vehicle was 20970 kg, and the speed at which the vehicle traveled on the loading plate 3 was 8 km / h or less. The measured value at this time was within ± 3% of the true weight. The running speed of the vehicle closest to its true weight was around 5 km / h.

[0014]

As described above, according to the present invention, the axle load can be detected only by the waveform processing of the electric signal (weight detection value), so that it is simple and complete while the tire is completely mounted. Since the weight value is detected and averaged, an accurate axle load can be detected. In particular, in the present invention,
The entry before and after this time is based on the center of the time exceeding the bell.
From the signal value in the time zone where the force signal level is relatively stable
Weight is determined, so it is also large
Accurate measurement is possible without being affected.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between the time that a wheel travels on a loading plate and an input signal level.

FIG. 2 is a diagram showing a state where a wheel passes over a detection device.

FIG. 3 is a plan view of an electric load detecting device using a strain gauge.

FIG. 4 is a cross-sectional view across the beam location of FIG. 3;

FIG. 5 is a diagram showing processing of a signal sent from the detection device.

FIG. 6 is a block diagram showing a specific configuration example.

FIG. 7 is a plan view showing a conventional example.

FIG. 8 is a front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric load detector 2 Wheel 3 Loading plate

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasumasa Takahashi 952-3 Kamekubo, Iruma-gun, Saitama (72) Inventor Haruki Kawada 165-9 Higashi Fukai, Nagareyama City, Chiba Prefecture (56) References JP-A Sho 53- 19059 (JP, A) JP-A-53-88770 (JP, A) JP-B-53-23099 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01G 19/02-19 / 03

Claims (1)

(57) [Claims] 1. A method of providing an electric load detecting device (1) on a road surface on which a vehicle passes and measuring an axle load of the vehicle from an electric output of the detecting device (1) , wherein a wheel (2) of the vehicle is When the weight detection value reaches a certain trigger level (T) on the loading plate (3) of the detection device (1).
The time when the trigger level (T) falls below the trigger time (T ₁ )
(T ₂₎ to measure the time (t ₁₎ until, on the basis of the 1/2 elapsed time (A) of the time (t _1), <br/> one or, set to equal intervals across this Predetermined time (t ₂ )
Axle load measurement method for a vehicle, wherein a weight value detected at the inner average detecting the axle load.