JP2671661B2 - Headlight tester optical axis deviation correction 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 correcting an optical axis shift by a headlight tester used when setting an optical axis of a vehicle headlight in a set direction.

[0002]

2. Description of the Related Art Conventional headlight testers include a screen type and a light collecting type. In particular, the screen type requires a relatively large distance between the headlight and the measurement surface (screen surface) on which the light axis of the headlight is irradiated and the optical axis that is the center of the light beam can be measured. It is used easily and often. For example, as shown in FIGS. 11 and 12, the vehicle 1 is placed at the measurement position H1 and the measurement distance L
The screen surface 3 of the headlight tester 2 at the position is irradiated with the light flux R of the headlight (see FIGS. 13A and 13B), and the deviation Δa between the center position P of the light flux R and the screen center position Q is measured. Then, the mounting position of the headlight is adjusted so as to remove the deviation Δa.

In this case, in particular, the vehicle 1 is not accurately placed at the measurement position H1, that is, in such a manner that there is no parallel deviation in the left-right direction X with respect to the reference center line L1 of the measurement position or inclination deviation θα in the longitudinal direction of the vehicle. Then, the measurement reference position on the screen surface 3 is displaced due to the displacement of the vehicle in the left-right direction X, and even if the optical-axis displacement adjustment is performed, the optical-axis displacement due to the displacement of the vehicle in the left-right direction X is not adjusted. Therefore, conventionally, in order to correct the correct position of the vehicle set at the measurement position H1, it is known that the measurement position H1 is provided with a mechanical equalizer 4 for restricting the approaching posture of the measurement vehicle that opposes the tester. There is.

[0004]

However, even if the mechanical equalizer 4 is used, tire deformation occurs when the vehicle is centered by the equalizer, resulting in a tire deformation error, and further, the mechanical equalizer itself. However, the conventional headlight tester cannot adjust the shift of the optical axis in the left-right direction X with higher accuracy, which is a problem.

An object of the present invention is to provide:

[0006]

In order to achieve the above object, the present invention sets a vehicle at an optical axis measurement position of a headlight and then shifts the vehicle inclination between the reference line of the optical axis measurement position and the vehicle. The amount of calculation is calculated, and the reference deviation amount of the measurement reference position due to the positional deviation in the left and right direction according to the vehicle tilt deviation amount of the vehicle on the screen surface irradiated with the light flux of the headlight is calculated, and A correction amount is calculated by correcting the lateral shift amount of the optical axis of the headlight with the reference shift amount, and an adjustment for removing the lateral shift of the optical axis of the headlight based on the corrected shift amount is performed. It is characterized by performing.

Further, after the vehicle is set at the optical axis measurement position of the headlight, the vehicle parallel deviation amount from the reference line of the optical axis measurement position and the vehicle inclination deviation amount from the reference line are calculated, and the headlight is calculated. Of the headlight on the screen surface is calculated by calculating the total reference deviation amount of the measurement reference position due to the positional deviation in the left-right direction corresponding to the vehicle parallel deviation amount and the vehicle tilt deviation amount on the screen surface irradiated with the luminous flux of The correction amount is calculated by correcting the deviation amount of the optical axis in the left-right direction with the total reference deviation amount, and the adjustment for removing the deviation of the optical axis of the headlight in the left-right direction is performed based on the correction deviation amount. Characterize.

[0008]

According to the first aspect of the present invention, the lateral shift amount of the optical axis of the headlight on the screen surface is corrected by the reference shift amount of the measurement reference position due to the lateral shift according to the vehicle tilt shift amount. Since the correction deviation amount is calculated, it is possible to perform the adjustment for removing the deviation in the left-right direction of the optical axis of the headlight based on the correction deviation amount. The second aspect of the present invention further includes a horizontal shift amount of the optical axis of the headlight on the screen surface,
The correction deviation amount is calculated by correcting with the reference deviation amount of the measurement reference position due to the lateral displacement according to the vehicle parallel deviation amount and the vehicle tilt deviation amount, so that the right and left of the optical axis of the headlight is calculated based on this correction deviation amount. Adjustments can be made to remove misalignment.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the processing steps of a method for correcting an optical axis shift of a headlight tester according to the first and second aspects of the invention. Here, as the first step, the vehicle for measurement is placed at a predetermined optical axis measurement position H1 of the headlight (see FIG. 4), the headlight is turned on, and the screen surface F as shown in FIG. The light flux R is radiated to the. After setting the vehicle,
A tilt deviation amount (see FIG. 2) θOF between the reference line C1 at the optical axis measurement position H1 and the longitudinal center line (reference line) C2 of the vehicle is calculated (for example, LFR1, 2 output from the wheel alignment tester). , LFL1, 2, LRR1, 2, calculated according to LRL1, 2) The second step is performed.

Subsequently, a third step of calculating the reference deviation amount (see FIG. 2) XOF of the optical axis measurement position H1 due to the positional deviation in the left-right direction X according to the vehicle inclination deviation amount θOF on the screen surface F is carried out. . Then, the shift amount XHP of the optical axis of the headlight on the screen surface F in the left-right direction X is measured by the reference shift amount CE of the measurement reference position (see FIGS. 2 and 3) CE (XOF of FIG. 6).
(Corresponding to the case where ΔXθ is regarded as only ΔXθ), and the fourth step of calculating the corrected deviation amount ΔXHP is performed. After that, a fifth step is performed based on the corrected shift amount ΔXHP to perform the adjustment for removing the shift in the left-right direction of the optical axis of each headlight. Finally, the turning off of the headlights and the post-processing of the vehicle exit processing are carried out as the sixth step.

As described above, according to the first method of correcting the optical axis deviation of the headlight tester, the lateral deviation amount of the optical axis of the headlight on the screen surface is adjusted to the lateral position corresponding to the vehicle tilt deviation amount θOF. The deviation, that is, the correction deviation amount ΔXHP is calculated by correcting with the reference deviation amount XOF of the measurement reference position CE, and the adjustment for removing the deviation in the left-right direction of the optical axis CR of the headlight is performed based on this amount ΔXHP. The reference deviation amount XOF due to the inclination at the vehicle center OP can be eliminated, and the optical axis deviation of the headlight tester can be corrected with higher accuracy.

A second optical axis deviation correcting method will be described with reference to FIGS. 7 and 8 instead of the first optical axis deviation correcting method for the headlight tester. Here, in the method of correcting the optical axis deviation of the first headlight tester, the second and third methods are used.
Since a part of each of the fourth step and the fourth step is changed and the other steps are performed in the same manner, duplicate description will be omitted. That is, in the second step here, after the vehicle is set, the parallel deviation amount that is the relative distance between the reference line C1 at the optical axis measurement position H1 and the center line (reference line) C3 in the front-rear direction Y including the vehicle center OP. ΔXB is calculated, and the vehicle tilt deviation amount θOF between the reference line C1 and the longitudinal centerline C2 of the vehicle is calculated. In the third step, the reference deviation amount XOF (= ΔXB of the measurement reference position CE due to the lateral deviation according to the vehicle parallel deviation amount ΔXB and the vehicle inclination deviation amount ΔXθ (a value corresponding to θOF) on the screen surface F.
+ ΔXθ) is calculated. In the fourth step, the lateral shift amount XHP of the optical axis of the headlight on the screen surface is corrected by the reference shift amount XOF of the measurement reference position CE, and then the corrected shift amount ΔXHP is calculated.

As described above, in the second method of correcting the optical axis deviation of the headlight tester, the deviation amount of the optical axis CR of the headlight on the screen surface in the left-right direction is calculated as the vehicle inclination deviation amount ΔXθ.
The correction deviation amount ΔXHP is calculated by correcting the total reference deviation amount XOF of the value (according to θOF) and the parallel deviation amount ΔXB, and the lateral deviation of the optical axis CR of the headlight is removed based on this correction value ΔXHP. Can be adjusted. in this case,
Vehicle tilt deviation amount ΔX, which is the tilt θOF of the vehicle at the vehicle center
Since θ and the parallel deviation amount ΔXB can be eliminated, the optical axis deviation of the headlight tester can be corrected with higher accuracy.

Next, an optical axis deviation correcting device for a headlight tester to which the method of the present invention is applied will be described with reference to FIG.
In FIG. 4, reference numeral 10 indicates a measurement passage through which the measurement vehicle 11 is guided to the optical axis measurement position H1, and the optical axis measurement position H1 is shown.
A headlight tester 12 provided with a screen surface R is provided at a position at a front distance L of. Headlight tester
Reference numeral 12 denotes a movable table 16 with a moving device 14 that can move at a target by a guide path 13 that crosses the measurement path 10, a pair of left and right screen surfaces R supported by the movable table 16, and the same surface R. A pair of cameras 17, 1 that capture the light image
7, and the distance between the optical axis CR position, which is the center position of the light flux R, and the reference position based on the image signal of each camera 17,
15 to calculate and output.

The four wheels of the vehicle that have reached the optical axis measurement position H1 can oppose the four-wheel wheel alignment tester 18.
The four-wheel alignment tester 18 is composed of four detectors 181 and an alignment controller 19 to which the detectors 181 are connected. In this case, each detection unit 1
81 is a pair of tire inclination amount detecting pieces 182, 18 that oppose each other.
2, the amount of protrusion can be output to the optical axis detection control device 15, and the device can automatically calculate the center position of the tire and the amount of inclination. In FIG. 4, reference numeral 20 indicates a start switch that outputs a start signal to the optical axis detection control device 15, reference numeral 21 indicates a completion switch that outputs a completion signal to the optical axis detection control device 15, and reference numeral 22 indicates an optical axis detection. The display driven by the controller 15 is shown.

Here, the optical axis detection control device 15 and the alignment control device 19 are both composed of microcomputers as essential parts and are connected to each other to exchange signals. In particular, the optical axis detection control device 15 performs headlight shift correction control and headlight shift correction amount calculation processing according to the programs of FIGS. 9 and 10. The operation of the optical axis detection control device 15 and the alignment control device 19 will be described below according to the control processing performed by the optical axis detection control device 15 and the alignment control device 19. The optical axis detection control device 15 and the alignment control device 19 start control by turning on a main switch (not shown). In this case, when the vehicle passes through the measurement passage 11 and is set to the optical axis measurement position H1 and the operator turns on the start switch 20, the alignment control device 19 follows a predetermined procedure to set the vehicle parallel deviation amount ΔXB and the vehicle inclination deviation. Quantity ΔXθ and screen surface F
The apparent displacement position XHP of the optical axis CR with respect to the base group position x0 (see FIGS. 6 and 8) is measured and stored in a predetermined area.

In this case, as is apparent from FIG. 7, the front and rear axle centers ACF, ACR and the axle offset angle θOF.
Becomes like the following formula. ACF = (LFL1 + LFL2-LFR1-LFR2) / 4 ACR = (LRL1 + LRL2-LRR1-LRR2) / 4 θOF≈ {(ACF-ACR) / WB} × 57.30 Further, the parallel deviation amount ΔXB and the vehicle inclination deviation amount ΔXθ are It becomes like the following formula. ΔXB = (ACF + ACR) / 2 Here, assuming that the pitch between the vehicle center OP and the screen surface F is PHC (= PHF + WB / 2), ΔXθ = PHC × (ACF−ACR) / WB The total reference deviation amount is XOF (= ΔXB + ΔXθ ) Can be calculated.

On the other hand, the optical axis detection control device 15 is
As shown in FIG. 9, headlight deviation correction control is started. First, wait for the start signal to turn on, then turn it on to step 2
Then, the data from each sensor etc. is fetched. When step a3 is reached, the headlight deviation correction amount calculation process shown in FIG. 10 is executed. Here, first, based on the latest data from the alignment control device 19, the parallel displacement amount ΔXB of the vehicle, the vehicle inclination displacement amount ΔXθ, and the apparent displacement position X of the optical axis CR with respect to the base group position x0 of the screen surface F.
Read the HP and store it in the specified area.

Next, the amount of parallel deviation ΔXB on the screen surface
And the total reference deviation amount XOF (= of the measurement reference position CE due to the positional deviation in the left-right direction according to the vehicle inclination deviation amount ΔXθ).
Calculate ΔXB + ΔXθ) from the following formula. In step b3, the correction position x of the left and right optical axes is calculated by the total reference deviation amount XOF.
An interval (left side) HPL (= HP-XOF) and an interval (right side) HPR (= HP + XOF) up to 0'are calculated. In addition, the right side of the traveling direction was positive and the calculation formula was established here.

After this, when the operation proceeds to step b4, here,
The correction deviation amount ΔXHPL (= HPL-XHPL) of the left optical axis and the correction deviation amount ΔXHPR (= HPR-XHPR) of the right optical axis are calculated,
Store in a predetermined area and return.

After that, when the step a4 of the headlight deviation correction control is reached, an output is made to display a left correction deviation amount ΔXHPL and a right correction deviation amount ΔXHPR on a drive circuit (not shown) of the display 22, and the same output signal is output. According to the display 22
Performs display operation. After that, in step a5, the permissible range within which the optical axis deviations ΔXHPL and ΔXHPR are removed ±
Wait to do something else within α. During this time, the operator adjusts the mounting means of the headlight, and the optical axis deviation amounts ΔXHPL, ΔXH
Perform adjustment work until PR reaches within the allowable range ± α. Then, when it reaches within the allowable range ± α, OK is displayed on the display section of the display.
(Pass) display.

In step a7, the operator waits for the completion switch 21 to be turned on. When the completion signal is output, a retreat drive signal is output to the moving device 14 of the movable base 16 of the headlight tester. As a result, the movable platform 16 is removed from the measurement passage 10, the vehicle that has undergone the measurement processing exits through the measurement passage 10, and the control ends. Such a device can automatically and accurately correct the optical axis deviation of the headlight tester, and in particular, can improve the workability of the optical axis deviation correction.

In the apparatus of FIG. 4, the parallel deviation amount ΔXB and the vehicle inclination deviation amount ΔXθ between the reference line of the optical axis measurement position H1 and the vehicle were measured by the four-wheel wheel alignment tester 18. The wheel-wheel alignment tester 18 is eliminated, and the distance between the reference position and a plurality of positions of the body of the vehicle is simply measured by a magnescale, and only the vehicle tilt deviation amount ΔXθ of the vehicle is input to the optical axis detection control device 15. The corrected shift amount ΔXHP may be calculated and removed only by the vehicle tilt shift amount ΔXθ, and in this case, the apparatus can be simplified.

[0024]

As described above, according to the first aspect of the present invention, the deviation amount of the optical axis of the headlight on the screen surface in the left-right direction is set to the measurement reference position by the position deviation in the left-right direction corresponding to the vehicle tilt deviation amount. The correction deviation amount is calculated by correcting with the reference deviation amount, and the adjustment for removing the deviation in the left and right direction of the optical axis of the headlight is performed based on the correction deviation amount, so that the vehicle tilt deviation can be eliminated and the light with higher accuracy can be obtained. You can adjust the axis deviation.

Further, in the second aspect of the present invention, the amount of deviation of the optical axis of the headlight on the screen surface in the left-right direction is measured based on the positional deviation in the left-right direction corresponding to the vehicle parallel deviation amount and the vehicle inclination deviation amount. Since the correction deviation amount is calculated by correcting the total reference deviation amount of the position, it is possible to perform the deviation adjustment of the optical axis with higher accuracy than the first invention.

[Brief description of the drawings]

FIG. 1 is a process block diagram of a method for correcting an optical axis shift of a headlight tester as first and second inventions.

FIG. 2 is a plan view illustrating a wheel alignment tester used in a method for correcting an optical axis deviation of a headlight tester according to a first aspect of the invention.

FIG. 3 is a plan view illustrating a method of correcting an optical axis deviation of a headlight tester as a first invention.

FIG. 4 is a schematic configuration diagram of an optical axis deviation correcting device for a headlight tester that employs a method for correcting an optical axis deviation of a headlight tester as a second invention.

FIG. 5 is a side view of a main part of FIG. 4;

6 is a plan view of a screen surface used in the optical axis deviation correcting device of the headlight tester of FIG.

FIG. 7 is a plan view illustrating a wheel alignment tester used in a method for correcting an optical axis deviation of a headlight tester according to a second invention.

FIG. 8 is a plan view illustrating a method of correcting an optical axis shift of a headlight tester as a second invention.

9 is a flowchart of headlight deviation correction control performed by an optical axis detection control device of the optical axis deviation correction device for the headlight tester in FIG.

10 is a flowchart of a headlight deviation correction amount calculation process performed by the optical axis detection control device of the optical axis deviation correction device for the headlight tester in FIG.

FIG. 11 is a schematic plan view of a conventional optical axis deviation correction device for a headlight tester.

12 is a schematic side view of an optical axis shift correction device for the headlight tester of FIG.

13A and 13B are plan views of the left and right screen surfaces used in the optical axis shift correction device of the headlight tester of FIG. 11.

[Explanation of symbols]

 10 Measurement Passage 11 Vehicle 12 Headlight Tester 15 Optical Axis Detection Controller 16 Movable Stand 18 Wheel Alignment Tester 19 Alignment Controller F Screen Surface R Luminous Flux CR Optical Axis ΔXθ Vehicle Tilt Deviation ΔXB Parallel Deviation

Claims (2)

(57) [Claims] 1. A screen surface on which a vehicle is set at an optical axis measurement position of a headlight, a vehicle tilt deviation amount between the reference line of the optical axis measurement position and the vehicle is calculated, and a luminous flux of the headlight is irradiated. The reference deviation amount of the measurement reference position due to the positional deviation in the left-right direction according to the vehicle inclination deviation amount of the vehicle is calculated, and the lateral deviation amount of the optical axis of the headlight on the screen surface is calculated as the reference deviation amount. A method for correcting a deviation of a headlight tester, characterized in that a correction deviation amount is calculated by correcting the deviation by an amount, and an adjustment for removing a deviation in the left-right direction of the optical axis of the headlight is performed based on the correction deviation amount. 2. After setting the vehicle at the optical axis measurement position of the headlight, the vehicle parallel deviation amount from the reference line of the optical axis measurement position and the vehicle inclination deviation amount from the reference line are calculated to obtain the headlight. Of the headlight on the screen surface is calculated by calculating the total reference deviation amount of the measurement reference position due to the positional deviation in the left-right direction corresponding to the vehicle parallel deviation amount and the vehicle tilt deviation amount on the screen surface irradiated with the luminous flux of The correction amount is calculated by correcting the deviation amount of the optical axis in the left-right direction with the total reference deviation amount, and the adjustment for removing the deviation of the optical axis of the headlight in the left-right direction is performed based on the correction deviation amount. A characteristic method for correcting the optical axis deviation of the headlight tester.