JPH0458133A - Antiskid brake testing device for automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an anti-skid brake testing device for automobiles.

[Conventional technology]

In a car driving on a frozen road surface, the coefficient of friction between the road surface and the tires is small, so when the brakes are applied, the tires are easily locked by the brakes. In this case, the tires do not roll against the road surface but slide against it, making it impossible for the vehicle to maintain direction, which is extremely dangerous.

Therefore, in order to safely brake without losing direction even when braking on frozen roads, an anti-skid brake system (ABS) has been developed that brakes the tires to the extent that no sliding friction occurs. ing.

The production of automobiles equipped with this type of ABS device is relatively recent, and as the number of cars produced is currently very small, ABS operation tests are conducted by running tests on completed cars on a test course. In this case, a considerable amount of cost is required to prepare for frozen road conditions.

[Problem to be solved by the invention]

However, as the number of vehicles produced increases, it is thought that an economical anti-skid brake testing device that performs performance tests quickly, reliably, and in a labor-saving and manpower-saving manner without running tests on a test course will become necessary.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide an economical anti-skid brake testing device for automobiles that performs performance tests quickly, reliably, and in a labor-saving and manpower-saving manner.

[Means to solve the problem]

To this end, the present invention provides a pair of front and rear idler rollers that respectively support the left and right rear wheels of the test vehicle, a rear wheel speed sensor that detects the 6th gear of each of the rear wheels, and a front axle of the test vehicle. A front shaft jack that supports the front wheels so that they can be raised and lowered, a movable running roller that is driven by a motor and that rotates the left and right front wheels by contacting them in a removable manner, and a front wheel speed sensor that detects the wheel speed of the left and right front wheels. After synchronizing the front wheel speed based on the output of the rear transport speed sensor, the wheel speed of the test vehicle was simultaneously disengaged from the clutch, depressed the brake, and separated from the movable running roller. It is characterized by comprising a computer that outputs and records the deterioration status.

[Effect]

According to such 1llff, the rear wheels of the test vehicle are
The front wheels are supported on top of a pair of idler rollers and driven by the onboard engine, and with the front axle slightly lifted off the road by the jacks, the running rollers rotate and the computer and 6-speed sensor work together to drive the rear wheels. Synchronized to the set rotation speed.

In this synchronized state, when the clutch is activated and the brake pedal is depressed and the front running roller is pulled away from the front wheel, the test vehicle's 6th gear gradually decreases in different patterns depending on the effectiveness of the ABS and eventually reaches zero.

Therefore, by comparing the condition of the 6th speed drop of the test vehicle during that time, that is, the pattern of wheel speed reduction, the magnitude of the cumulative rotation speed, the length of the lap-up time leading to a stop, etc., we can determine the effect of the ABS of the test vehicle. It is possible to judge whether it is good or bad.

〔Example〕

An embodiment in which the present invention is applied to an ABS test of a front wheel will be explained with reference to the drawings. Fig. 1 is an overall side view, Fig. 2 is a partially enlarged view showing the part ■ in Fig. 1, and Fig. 3 is a partial enlarged view of the A front view showing the front axis of the figure, Figure 4 is AB determined by the device in Figure 1.
FIG. 4 is a diagram showing changes in front wheel rotation speed when S is activated.

First, in Figures 1 to 3, 1 is a front wheel supported on one end of a front axle 2, and the front axle 2 is supported at its center by a jack 3 so that it can be raised and lowered to such an extent that the front wheel 1 is slightly off the floor. There is.

Reference numeral 4 denotes a running roller which is pivotally attached to the upper end of a link 6 whose lower end is pivotally attached to the rear end of the base plate 5 and contacts the outer periphery of the front wheel 1 to rotate it. Reference numeral 7 represents a motor fixed to the front end of the base plate 5. 7 drives the running roller 4 via a belt 8.

9 is a hydraulic cylinder whose lower end is pivotally connected to the base plate 5 between the motor 7 and the lower end pivot point of the link 6, and whose upper end is pivotally connected to the center of the link 6. 10 is in contact with the front wheel 1 and controls its 6th gear. 6゜12 is an integrated type front wheel speed sensor for detecting the front wheel rotation speed.
A pair of rear wheel idler rollers 13 is an integrating type rear wheel speed sensor 15 for detecting the rear wheel rotation speed, and a front wheel 6 speed sensor 10. By controlling the motor 7 by inputting the output of the rear wheel speed sensor 13, the rotation speed of the front wheels 1 is synchronized with that of the rear wheels 11, and the rotation speed of the front wheels 1. rear wheel 1
Computer 16 records and outputs the number of rotations of 1. Leaf springs 16 support the front and rear axles, respectively.

In such a device, when carrying out an ABS test, first, as shown in FIG. By doing so, the front wheel 1 is pulled away from the road surface, and the hydraulic cylinder 9 is extended, thereby bringing the running roller 4'' into contact with the front shaft 1.

In this state, the rear wheel 11 is
is driven at a specified speed, for example, 60 kn/h, and the rotation speed of the front axle 1 is controlled by controlling the motor 7 via the computer 15 based on the outputs of the rear wheel speed sensor 13 and the front wheel speed sensor 10. It is synchronized with that of the rear wheel 11.

Next, when the rotational speeds of both wheels are synchronized at the specified speed, the inspector disengages the engine clutch, pulls the running roller 4 away from the front axle 1, and depresses the brake pedal to increase the rotational speed of the wheel to be tested. 6 changes until it reaches zero
Detected via speed sensor 1.11 and recorded.

FIG. 4 shows the pattern of changes in the rotational speed determined in this way, where a shows the case when the ABS is activated and b shows the case when the ABS does not operate.

In other words, at curve a, the braking is effective and the wheel speed decreases,
When the wheels are on the verge of locking due to the brakes, the brakes are automatically released by the action of the ABS, so the wheels rotate at approximately constant speed for a while, then the brakes are automatically applied and 6th gear is lowered, and when the wheels are on the verge of locking, the brakes are released again. The braking is automatically released by the action of the ABS, and after deceleration is repeated in this pattern, the wheels eventually come to a stop after a time ta.

On the other hand, at curve b, the wheels lock due to the depression of the brake pedal, and the wheels slide on the road surface with friction, while the 6th gear decreases linearly and reaches zero after time tb. Become.

Curves a and b are obtained through multiple tests, and in this case, qualitatively, the shape of both curves determines the stop time, that is, the wrap-up times ta and tb, and the cumulative rotational speed during the wrap-up time ta. Depending on the size, the quality of the ABS function of the test vehicle is determined by comparing it with the reference curve.

Here, since the wheelbase of the test vehicle varies in size,
A pair of idler rollers to support the rear wheels, a 6-speed sensor for the rear wheels, and a jack to support the front wheels.

It is practical to make either the running roller or the front wheel speed sensor movable in the longitudinal direction.

Note that instead of using a hydraulic cylinder to connect and release the running roller to and from the front wheel, an electromagnetic clutch attached to the motor may be used.

〔Effect of the invention〕

In short, according to the present invention, there is provided a pair of front and rear idler rollers that respectively support the left and right rear wheels of the test vehicle, a rear wheel speed sensor that detects the 6th speed of each of the rear wheels, and a front axle of the test vehicle. A front wheel jack that supports the front wheel so that it can be raised and lowered, a movable running roller that is driven by a motor and that rotates the left and right front wheels by contacting them in a removable manner, and a front wheel 6-speed sensor that detects the 6th speed of the left and right front wheels. After synchronizing the front wheel speed based on the output of the rear wheel speed sensor, the wheel speed of the test vehicle is reduced by simultaneously disengaging the test vehicle's clutch, stepping on the brake, and separating the movable running roller. Equipped with a computer that outputs and records the status, this is an economical anti-skid brake testing device for automobiles that performs performance tests quickly, reliably, and in a labor-saving manner! However, the present invention is extremely useful industrially.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing one embodiment of the present invention, Fig. 2 is a partially enlarged view showing the part ■ in Fig. 1, Fig. 3 is a front view showing the front shaft of Fig. 1, Fig. 4 is AB determined by the device shown in Figure 1.
FIG. 4 is a diagram showing changes in front wheel rotation speed when S is activated. 1... Front wheel, 2... Front axle, 3... Jacket, 4...
・Running roller 5... Board, 6... Link, 7... Motor 8... Belt, 9... Hydraulic cylinder 10... Front wheel speed sensor 11... Rear wheel,
12... Idler roller 13... Rear wheel speed sensor 5... Computer 6... Leaf spring,

Claims (1)

[Claims] A pair of front and rear idler rollers that support the left and right rear wheels of the test vehicle, a rear wheel speed sensor that detects the wheel speed of each of the rear wheels, and a front wheel that supports the front axle of the test vehicle so that it can be raised and lowered. a shaft jack, a movable running roller that is driven by a motor and that rotates the left and right front wheels by contacting them in a removable manner, a front wheel speed sensor that detects the wheel speed of the left and right front wheels, and the rear wheel speed mentioned above. After synchronizing the front wheel speed based on the output of the sensor, output and record the decrease in wheel speed of the test wheel due to the simultaneous operation of disengaging the test vehicle's clutch, stepping on the brake, and separating the movable running roller. An automobile anti-skid brake testing device characterized by comprising a computer.