JPH05126684A - Brake testing device for vehicle - Google Patents

Abstract

PURPOSE:To test operations of a brake system and an ABS with one testing device. CONSTITUTION:A high-friction region 31a having high friction resistance with a wheel W and a low-friction region 31b having low friction resistance with the wheel W are adjacently formed on a tire driving roller 31 mounted with the wheel W. The relative position in the axial direction of the tire driving roller 31 between the wheel W and the tire driving roller 31 is switched by a switching means 27, and the test of the braking force of a brake system and the test of the operation state of an ABS can be performed with one device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle braking test device for measuring whether or not a vehicle braking system and an anti-skid system are suitable.

[0002]

2. Description of the Prior Art After a vehicle is manufactured, it is tested whether the brake system and the anti-skid system incorporated in the vehicle are properly operated. The anti-skid system is generally referred to as ABS, and is a device used to reduce the directional stability and braking distance of the vehicle during sudden braking. This ABS normally determines whether or not the wheel is in a state of locking or idling based on the acceleration / deceleration of the wheel obtained by differentiating the wheel speed and the slip ratio obtained from the wheel speed and the vehicle speed. .. Whether the ABS and the brake system operate properly is tested by a test device after the vehicle is completely assembled.

FIGS. 12 (A) and 12 (B) are views showing a conventional braking force test apparatus for testing a brake system, in which two tire driving rollers 1 are parallel to each other with a predetermined gap. The tire holding unit 2 provided with is installed corresponding to the position of the wheel W provided on the vehicle B. The tire driving rollers 1 provided as a pair in one unit 2 are connected to each other by a chain 3 so as to rotate in synchronization with each other, and have grooves formed on the outer peripheral surface as shown in the drawing. And these rollers 1 are unit 2
Is driven via a power transmission belt 5 by a motor 4 provided in the vehicle, and the wheel W is rotationally driven by rotating the tire driving roller 1 by the motor 4. Therefore, in order to inspect the brake system of the completed vehicle, when the inspection operator depresses the brake pedal P, the tire W is braked and the braking force is transmitted to the tire driving roller 1. As a result, a braking force detector (not shown) directly connected to the tire driving roller 1 detects the braking force, and the test result is displayed on the display unit via a control panel (not shown).

When testing the ABS provided on the vehicle, the tire driving roller 1 having a groove is used when the test apparatus shown in FIG. 12 is used. The friction resistance with the tire is too high, the tire W does not lock, and the ABS does not operate. For this reason, conventionally, for vehicles having ABS, the ABS test device also called a free roller tester shown in FIG. 13 is used. This test apparatus has two free rollers 11 and 12 which are rotated by a chain 13 in synchronization with each other, and an auxiliary free roller 14 which is arranged adjacent to one free roller 12. ..
With this ABS test device, so-called sensory evaluation is performed in which the worker inspects the kickback on the free roller, that is, the periodical fluctuation of the reaction force transmitted from the pedal with his five senses.

[0005]

Therefore, conventionally, for a vehicle provided with an ABS, after the braking system is tested by a braking force tester, the vehicle is not
It is necessary to carry it to the BS test device and to test the ABS there, and the workability of the braking test including the ABS test is not good.

Therefore, an object of the present invention is to provide a braking test device for a vehicle, which can perform a brake system test and an ABS test with the same device.

[0007]

According to the present invention for achieving the above object, the wheels are placed in parallel with each other and are arranged corresponding to the positions of the wheels of the vehicle to be measured. A plurality of pairs of tire driving rollers, a high friction area formed in each tire driving roller and having high frictional resistance between the wheels, and each tire driving roller formed adjacent to the high friction area, Low friction area between them, a position where the wheel is placed in the high friction area by changing the relative position of the wheel and the tire drive roller in the axial direction of the tire drive roller, and the low friction A braking test device for a vehicle having switching means for switching and moving to either of the regions.

[0008]

To test the braking force of the vehicle braking system, the vehicle wheels are positioned in the high friction areas of the tire drive rollers. In this state, when the worker depresses the brake pedal of the vehicle while rotating the tire driving roller, the braking force of the brake system is automatically measured. Then
To check the operating state of the ABS, the wheel is positioned in the low friction area of the tire drive roller by activating the switching means. In this state, when the operator depresses the brake pedal while driving the tire driving roller, it is automatically determined whether the ABS is properly operated or not based on the fluctuation state of the braking force.

[0009]

Embodiments of the present invention shown in the drawings will be described below. 1 (A) and 1 (B) are diagrams showing a vehicle braking test apparatus according to an embodiment of the present invention, in which a first measurement unit 21 holding front wheels of a vehicle B and a second measurement unit holding rear wheels thereof. Unit 22 and these are installed on a base 23. In the first measurement unit 21, wheels 26 rolling on guide grooves 25 formed on the base 24 have a carriage 27, and the carriage 27 is reciprocally movable in the vehicle width direction of the vehicle B. .. In order to drive the carriage 27, a rod 29 of a power cylinder 28 attached to the base 24
Is connected to the carriage 27.

On the carriage 27, two pairs of tire driving rollers 31 are installed, each pair corresponding to the left and right wheels. Each roller 31 is a vehicle B
In order to drive these rollers 31, the rotation of the motor 32 attached to the carriage 27 is transmitted to the rollers 31 via the driving force transmission belt 33. It has become. The two rollers forming a pair rotate in synchronization with each other by a connecting chain 34. Each tire drive roller 31
2 is enlarged as shown in FIGS. 2 (A) to 2 (C).
Grooved portion 31a having a groove on the surface on one side in the vehicle width direction
And the other side is a flat surface portion 31b which has no groove on the surface and is flat. The grooved portion 31a becomes a high friction region having a high friction coefficient with the tire W, and the flat portion 31b
Is a low friction area.

A notch 35 having a length corresponding to the reciprocating stroke of the carriage 27 is formed on the upper surface of the carriage 27 so as to be located between the pair of tire driving rollers 31. Then, the drive cylinder 3 attached to the base 24
The lifter plate 37 that can be moved up and down by 6
It is provided at the position of the cutout portion 35. The second measurement unit 22 that holds the rear wheels also has the same structure as the first measurement unit 21.
The members common to the members in 1 are designated by the same reference numerals.

FIG. 1 is a view showing a state in which the braking force of the brake system of the vehicle B is being tested. At this time, as shown in FIG. 1B, all the wheels W are in the groove of the tire driving roller 31. It is supported by the processing section 31a. Figure 3
(A) and (B) show a state in which the vehicle B is lifted from the carriage 27 by supporting all the wheels W by the lifter plate 37. Under this state, by moving the carriage 27 by a predetermined stroke, the flat surface portion 31b of the tire driving roller 31 is positioned below the wheel W. Figure 4
(A) and (B) show a state in which the lifter plate 37 is moved down and the wheels W are placed on the flat surface portion 31b under this state. Under this state, the ABS operation test is performed. Done.

FIG. 5 is a diagram showing a control circuit of the above-mentioned braking test device, in which signals from a motor 32 for driving a tire driving roller 31 and a braking force detector 41 directly connected to each roller 31 are shown. Are sent to a control panel 42 having a built-in CPU and the like.
A signal is sent to the display unit 43 that displays the measurement result.

In the present invention, the ABS function is quantitatively evaluated by using the above apparatus without sensory evaluation of ABS evaluation. In the case of a vehicle having ABS, when the brake pedal P is depressed with the wheel W at a predetermined rotation speed, the braking force immediately increases.
When the upper limit of the predetermined braking force is reached, the braking force is reduced, and the ABS repeats fluctuations in the braking force. FIG. 6 is a diagram showing a variation state of the braking force in a vehicle of a certain vehicle type, and the number of variations, that is, the number of operations within the set time T when the ABS is properly operated, is experimentally obtained in advance according to the vehicle type. .. This experimental data is stored in a memory provided in the control panel 42, and when the brake pedal P is depressed, the lower limit value L of the braking force is first exceeded, and the experimental data is provided in the control panel 42. The timer starts,
After that, the number of operations is counted each time the braking force becomes lower than the lower limit value L. If the predetermined number of times of operation N is counted within the set time T, it is automatically determined that the ABS of the vehicle has the desired performance. However, the number of fluctuations may be counted when the upper limit value is exceeded.

Next, a procedure for carrying out a vehicle braking test by the above-mentioned test apparatus will be described with reference to the flow charts shown in FIGS.

The vehicle B is self-propelled to the top of the test apparatus through a vehicle carry-in path provided so as to be at substantially the same level as the lifter plate 37 in the ascending limit. If it is determined in step S1 that the vehicle W has entered and the wheels W have been placed on the lifter plate 37, the lifter plate 37 is moved by the cylinder 36 in step S2 to test the braking performance of the brake system. To move down. When the completion of the descending movement is detected, the tire driving roller 31 is driven by the motor 32 (step S
3, S4). When the worker depresses the cake cake pedal P while driving the roller 31, the tire W is braked, the braking force is transmitted to the tire driving roller 31, and the braking force detected by the braking force detector 41. Is sent to the control panel 42 in step S5. When the end of the braking force test is determined by releasing the depression of the brake pedal P and removing the braking force, the rotation of the tire driving roller 31 is stopped and the braking force is determined based on the obtained data. The suitability of is judged (steps S6 to S8). This determination result is displayed on the display unit 43 (step S
9, S10).

In this way, after the braking force of the brake system is measured, step S11 is executed to raise the lifter plate 37, and it is determined in step S12 whether the vehicle is equipped with ABS. It ABS
If it is determined that the vehicle is not equipped with, the vehicle will exit. If the vehicle being inspected has ABS, then in step S13 the carriage 27 is moved to FIG.
And the lifter plate 37 is moved down in step S14.

When the completion of the downward movement is detected, the tire driving roller 31 is driven to start the ABS test (S15 to S17). If the braking force exceeds the lower limit value L by the operator depressing the brake pedal P (step S18), the timer is turned on in step S19, and the number of operations shown in FIG. 6 is counted in step S20. .. When the time set by this timer has elapsed, it is judged in step S21 and step S2
At 2, the rotation of the tire driving roller 31 is stopped. And
In step S23, the number of times of operation counted within the set time T is compared with the number of times that the ABS of the vehicle to be measured will operate in advance if the ABS is appropriate, and whether or not the ABS is in an appropriate operating state. To judge. The determination result is displayed on the display unit 43 in steps S24 and S25,
Steps S26 to S28 are executed to complete the braking test on the vehicle.

10 and 11 are views showing a vehicle braking test apparatus according to another embodiment of the present invention. In this case, the tire driving roller 31 is rotatably attached to a fixing member (not shown). , Is rotated by a motor. The structure of the tire driving roller 31 itself is the same as that of the above-mentioned embodiment, and has a grooved portion 31a and a flat portion 31b. In order to move the vehicle B between the state in which the wheel W is placed on the grooved portion 31a and the state in which the wheel W is placed on the flat surface portion 31b, the rollers 5 contacting the side surfaces of the respective wheels W.
A pair of switching members 52, 53 provided with 1 are provided so as to be reciprocally movable in the vehicle width direction. A pair of switching members 5
As shown in FIG. 10, the reference numerals 2 and 53 are opposed to each other, and when one switching member 52 moves forward, the other switching member 53 moves backward. Two pairs of these switching members are provided for the front wheels and the rear wheels. Each switching member 52, 53 is reciprocated by a drive cylinder 54.

For example, as shown in FIG. 11, from the state in which the wheel W is placed on the grooved portion 31b to the flat portion 31b.
In order to switch to the state in which the switching member 53 is placed on, the switching member 53 is moved forward, and at the same time, the other facing switching member 52 is moved backward. At this time, the wheels W are kept rotating so that the vehicle moves smoothly, and the rollers 51 also rotate as the wheels W rotate. Also in this case, the braking force test and the ABS operation test are automatically performed in the same manner as in the above embodiment.

As described above, according to the test apparatus according to the illustrated embodiment, whether or not the operation of the ABS is appropriate is tested by the sensory test of the worker, but it is stored in the memory. Of changing braking force and A tested
By comparing the fluctuation state of the braking force of the BS, it is possible to automatically determine whether or not the ABS operation is appropriate, and it is possible to perform not only the braking force of the brake system but also the ABS operation test with extremely high efficiency. Can also be performed.

[0022]

As described above, according to the present invention, each pair of tire driving rollers has a high friction area for testing the braking force of the brake system and a low friction area for testing the operating state of the ABS. And the relative position between the wheel and the tire driving roller is changed by the switching means, the braking system and AB
The operation of S can be continuously tested, and the workability of these tests is significantly improved.

[Brief description of drawings]

FIG. 1A is a front view of a braking test apparatus according to an embodiment of the present invention showing a state in which a braking force is being tested, and FIG.
Is a plan view of FIG.

FIG. 2 is an enlarged view showing the tire driving roller shown in FIG.

3 is a front view and a plan view showing a state where the vehicle is lifted by a lifter from the state shown in FIG.

FIG. 4 is a front view and a plan view showing a state where an ABS operation test is being performed.

FIG. 5 is a block diagram showing a control circuit of the device shown in FIGS.

FIG. 6 is a measurement graph showing changes in the braking force detected by the braking force detector of the present invention when the ABS operates.

FIG. 7 is a flowchart showing an operating state of the braking test device of the present invention,

FIG. 8 is a flowchart showing an operating state of the braking test apparatus of the present invention,

FIG. 9 is a flowchart showing an operating state of the braking test apparatus of the present invention,

FIG. 10 is a plan view showing a braking test device according to another embodiment of the present invention,

11 is a sectional view taken along the line 11-11 in FIG.

FIG. 12 is a front view showing a conventional brake test device,

FIG. 13 is a front view showing a conventional ABS operation test device.

[Explanation of symbols]

21 ... 1st measurement unit, 22 ... 2nd measurement unit, 2
Reference numeral 4 ... Base, 27 ... Truck (switching means), 31 ... Tire driving roller, 31a ... Groove processing portion (high friction area) 31b ... Flat portion (low friction area), 41 ... Braking force detector, 42 ... Control panel , 43 ... Display unit, 53 ... Switching member (switching means),
B ... vehicle, P ... brake pedal, W ... wheel (tire).

Claims (1)

[Claims] 1. A plurality of pairs of tire driving rollers, which are arranged in parallel to each other and correspond to the positions of the wheels of a vehicle to be measured, and on which the wheels are mounted, and a pair of the tire driving rollers. A high friction region having a high frictional resistance with the wheels, a low friction region having a low frictional resistance with the wheels formed on each tire driving roller adjacent to the high friction region, the wheels and the A vehicle having a tire driving roller and a switching means for changing the relative position of the tire driving roller in the axial direction to switch and move the wheel between the position where the wheel is placed in the high friction region and the low friction region. Braking test equipment.