JP2998814B2 - Judgment method for side slip value of automobile - 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 judging a side slip value of an automobile.

[0002]

2. Description of the Related Art In order to drive a vehicle stably, a wheel alignment such as a camber angle, a toe angle and a caster angle is set, and a side slip tester is used to evaluate the wheel alignment by using a side slip tester. Methods of measuring values have been performed.

[0003] For example, a vehicle to be measured is passed over a tread of a side slip tester, the movement of the tread moved by the side slip of the vehicle to be measured is measured, and the maximum value of this movement is used as the side slip value of the automobile. Measurement method,
As described in Japanese Utility Model Application Laid-Open No. 63-50033, a displacement detector for detecting the movement amount of the tread on the tread is ON / O.
FF-controllable entrance-side and exit-side foot switches are installed separately, and these foot switches are set so that the travel distance of the tread plate is proportional to the travel distance of the measured wheel of the vehicle under test on the foot plate. It is known that a side slip value is measured by a side slip tester installed at a predetermined position in a region to be formed, and the pass / fail judgment is made by comparing the side slip value with a reference side slip value.

[0004]

The amount of movement of the tread on the tread plate of the side slip tester and the wheel alignment of the vehicle to be measured and the amount of time on the tread plate of the tread plate when all of the side slip measurement methods are normal are measured. When there is an abnormality in any one of the side slip tester, the wheel alignment of the vehicle to be measured, and the side slip measurement method, the relationship is not proportional.

[0005] Therefore, in the former described in the prior art, the side slip value increased due to the abnormality is adopted as the maximum value, and the abnormality cannot be confirmed. If the determination is made, there is a problem that the wheel alignment needs to be readjusted.

Also, in the latter case, there is a possibility that the amount of side slip may change when the vehicle to be measured steps on a foreign substance on a tread plate, which is a step switch, and the abnormality cannot be confirmed. There is a problem in that if the comparison is made and it is determined to be rejected, it is necessary to readjust the wheel alignment.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to confirm the presence or absence of an abnormality at the time of measuring the amount of side slip to obtain an accurate side slip. It is an object of the present invention to provide a method of judging a side slip value of a vehicle, which can determine a pass or fail by measuring the value.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a vehicle for detecting the amount of movement of a tread plate moved by a vehicle to be measured passing over the tread plate as a side slip value of the vehicle and comparing the detected value with a reference side slip value. In the side slip value determination method, the side slip value when the first vehicle detector on the approach side of the tread plate of the measured vehicle detects the vehicle to be measured and the second vehicle detector on the exit side of the tread plate of the measured vehicle are measured. car
A first step of calculating a side slip value of the vehicle to be measured from the side slip values when both are detected and comparing the calculated value with a reference side slip value; and a side slip amount between the first vehicle detector and the second vehicle detector. A second step of calculating a side slip change average straight line from the degree of change, giving a side slip amount measurement abnormality allowable width to the side slip change average straight line, and comparing it with the locus of the side slip amount. If the second step satisfies the conditions, it is determined to be acceptable.

Further, the side slip value of the measured vehicle can be obtained from the average line of the side slip change amount.

[0010]

In the first step, the first vehicle detector detects the vehicle to be measured.
The side-slip value when the detected second vehicle detector to be
The side slip value is calculated from the side slip value when the measured vehicle is detected and compared with the reference side slip value. The trajectories of the quantities are compared, and if both the first step and the second step satisfy the conditions, it is determined that the side slip value of the measured vehicle is acceptable.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a configuration diagram for carrying out a method of determining a vehicle side slip value according to the present invention, FIG. 2 is an explanatory diagram showing a relationship between a side slip amount and a side slip amount measurement distance or measurement time, and FIG. It is explanatory drawing which shows the variation amount average straight line and the side slip amount measurement abnormality allowable width.

The side slip tester 1 has a pair of left and right tread plates 2 and 2 movable in the left and right direction, and a pair of right and left light projectors 4L disposed opposite to each other on the entry side of the measured vehicle 3 with the tread plates 2 and 2 interposed therebetween. 1st vehicle detector 4 consisting of a photodetector 4R
And a second vehicle detector 5 composed of a pair of left and right light emitters 5L and light receivers 5R arranged on the exit side of the measured vehicle 3 with the tread plates 2, 2 interposed therebetween, and the movement amount of the tread plates 2, 2 A moving amount detector 6 to be detected, an arithmetic unit 7 for performing arithmetic processing on output signals and measurement times of the vehicle detectors 4 and 5 and the moving amount detector 6 and outputting a measurement result, a judgment result, and the like, and a measurement result And a display device 8 for displaying a judgment result and the like.

The first vehicle detector 4 is provided at a side portion of the side plates 2 and 2 for detecting a side slip amount which is not affected by a side slip amount measurement error caused by the vehicle 3 to be measured entering the tread plates 2 and 2. And the second vehicle detector 5 is also provided on the side portions of the tread plates 2 and 2 which can detect the side slip amount which is not affected by the side slip amount measurement error caused by the withdrawal of the measured vehicle 3 from the tread plates 2 and 2. Are located. Note that the first vehicle detector 4 and the second vehicle detector 5 may be non-contact sensors other than the photoelectric tube.

The operation of the method for judging the side slip value of an automobile according to the present invention having the above-described configuration will be described. First, when the measured vehicle 3 enters and exits the treads 2 and 2 at a predetermined speed while the side slip tester 1 is in the measurement state, the tread movement detected by the movement detector 6 as shown in FIG. That is, the side slip amount S is processed by the arithmetic unit 7 in relation to the side slip amount measurement distance or the measurement time.

The first vehicle detector 4 detects the vehicle 3 to be measured.
Value S1 when the vehicle is detected and the side slip value S2 when the second vehicle detector 5 detects the vehicle 3 to be measured.
Is compared with the reference side slip value KS as the side slip value SS of the measured vehicle 3 to determine whether or not the measured value is acceptable.

Note that if the side slip value SS ≦ the reference side slip value KS, the result is judged to be acceptable. On the other hand, if the side slip value SS> the reference side slip value KS, the result is judged unacceptable.

Further, as shown in FIG. 3, a side slip change amount average straight line H is calculated from the degree of change of the side slip amount S changed from the side slip value S1 to the side slip value S2. Note that the side slip change average straight line H
May be calculated as a regression equation based on the correlation between the side slip amount S and the side slip amount measurement distance or measurement time, but is not limited to this.

Then, the side slip variation average line H
And a trajectory of the side slip amount S is compared with a value obtained by giving a preset allowable side slip width P to the side slip tester 1, the wheel alignment of the measured vehicle 3 and the side slip measurement at the time of measuring the side slip amount. It is determined whether there is any abnormality such as a method.

The determination of the presence or absence of an abnormality is made by determining the side slip amount S.
When the trajectory exceeds the side slip amount measurement abnormality allowable width P as indicated by the hatched portion A in FIG. 3, it is determined that there is an abnormality.
If it is determined that there is an abnormality during the measurement of the side slip amount, even if the side slip value SS is determined to be acceptable as compared with the reference side slip value KS, the side slip tester 1 during the side slip amount measurement, Measurement vehicle 3
Since the wheel alignment and the side slip measurement method are determined to be abnormal, the overall determination result is rejected.

The side slip amount measurement abnormality allowable width P passes the average amplitude or side slip value SS of the side slip amount S changed between the first vehicle detector 4 and the second vehicle detector 5 measured up to the previous time. Is determined, the average amplitude of the side slip amount S changed between the first vehicle detector 4 and the second vehicle detector 5 is assumed.

Further, the side slip value SS is calculated by calculating the side slip value H1 at the timing of the first vehicle detector 4 and the side slip value H2 at the timing of the second vehicle detector 5 in the average side slip variation straight line H. The difference (H2−H1) may be calculated and obtained.

Further, the speed V of the measured vehicle 3 at the time of measuring the side slip amount is obtained from the side slip amount measurement distance and the measurement time.
Is calculated and compared with the reference vehicle speed KV.
If the speed V of the vehicle is higher than the reference vehicle speed KV or too low, the measurement accuracy of the side slip value SS is poor, so that the vehicle may be determined to be rejected.

The result of such determination, the presence or absence of a side slip amount measurement abnormality, the side slip value SS, the speed V of the measured vehicle 3 and the like are displayed on the display device 8.

[0024]

As described above, according to the present invention, the side slip tester for measuring the amount of side slip, the presence of abnormalities in the wheel alignment of the vehicle to be measured and the side slip measuring method, and the like, can be used to check the side slip. This can contribute to improving the accuracy of the value and improving the efficiency of the side slip value determination work of the vehicle.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for implementing a method for determining a vehicle side slip value according to the present invention;

FIG. 2 is an explanatory diagram showing a relationship between a side slip amount and a side slip amount measurement distance or measurement time.

FIG. 3 is an explanatory diagram showing a side slip variation average straight line and a side slip measurement abnormality allowable width;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Side slip tester, 2 ... Tread plate, 3 ... Vehicle to be measured, 4 (4L, 4R) ... 1st vehicle detector, 5 (5L, 5)
R): second vehicle detector, 6: moving amount detector, 7: arithmetic unit, 8: display device, H: side slip change average line, KS: reference side slip value, P: side slip amount measurement abnormality allowable Width, S: side slip amount, S1: first
Side slip value at the vehicle detector, S2: Side slip value at the second vehicle detector, SS: Side slip value.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01M 17/00-17/06 G01B 5/00

Claims (2)

(57) [Claims] 1. A method for determining a side slip value of a vehicle, comprising detecting a travel amount of the tread plate moved by the vehicle to be measured having passed over the tread plate as a side slip value of the vehicle and comparing the detected value with a reference side slip value. the first vehicle detector second vehicle detector treadle exit side of the side slip value and the measured vehicle when it detects the measured vehicle side is pre
Serial a first step of comparing the reference sideslip value to calculate the side slip value of the <br/> measured vehicle from side-slip value when it is detected to be measured vehicle, said first vehicle detector
Locus of the side slip amount with the second calculates the side-slip variation average linear than the degree of change in the side slip between the vehicle detector, providing a side slip amount measurement abnormality tolerance to the side-slip variation average linear the second consists of steps, the side slip value determination method of a motor vehicle and judging as acceptable if the first step satisfies the second step with conditions to be compared with. 2. The side slip value of the vehicle to be measured,
2. A method according to claim 1, wherein the value is obtained from the average line of the side slip change amount.
The method for judging a side slip value of an automobile as described in the above.