JPH0735650A - Apparatus for inspecting anti-lock brake - Google Patents

Abstract

PURPOSE:To prevent an increase of the difference of the rotating speed between right and left wheels and to inspect an ABS(anti-lock brake system) even when the brake force is different between both wheels, by coupling right and left rollers via a coupling means which releases the coupling when not smaller than a predetermined torque acts. CONSTITUTION:The rotating speed of both rollers 11, 11 is equal when an automobile runs to reach a predetermined speed. When a brake pedal is put down, the rotating speed of both rollers 11, 11 is decreased by the brake force of wheels. At this time, if the braking force of the left side is stronger, a torque due to the difference of the braking force acts to a clutch 21 coupling the rollers 11 and 11, whereby the clutch 21 is released. When the deceleration of the left wheel exceeds a predetermined value, the anti-lock-system works to loosen the brake force. As a result, the torque is reduced and the clutch 21 is coupled again thereby to synchronize the rollers 11 and 11. In this manner, since the increase of the difference of the rotating speed between right and left wheels is prevented, the performance of the ABS can be inspected without attaching a motor to the rollers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention runs an automobile equipped with an anti-lock brake with wheels on rollers, and when a predetermined speed is reached, the brake is operated to inspect the anti-lock brake. The inspection device to be performed.

[0002]

2. Description of the Related Art Conventionally, as this type of device, for example, according to Japanese Patent Laid-Open No. 4-305133, a pair of right and left rollers for front wheels and a pair of left and right rollers for rear wheels are provided, and each roller is provided with a clutch. When the vehicle is driven by connecting each wheel with each wheel mounted on each roller, the rear wheel is rotated by the rotation of the roller for the front wheel, which is the driving wheel, through the clutch and the roller for the rear wheel, which is the driven wheel. During the brake inspection, each wheel is placed on each roller to drive the automobile, and when a predetermined speed is reached, the clutch of each roller is released to allow each roller to rotate independently. There is known a device that depresses the brake pedal in this state and inspects the operating state of the antilock brake from the rotational speed of the roller and the like.

[0003]

The anti-lock brake detects the rotational speed of a wheel during traveling, and when the deceleration of the rotational speed exceeds a predetermined value, the hydraulic pressure of the brake is reduced to lock the wheel. However, for example, when the running state of the automobile is cornering, the rotation speed of the outer wheels becomes faster, so if the rotation speed difference between the left and right wheels exceeds a predetermined value, the rotation speed becomes high. In some cases, the antilock control for both wheels is set based on the deceleration of the rotating wheels.

On the other hand, the braking forces on the left and right wheels are not necessarily the same, and when the antilock brake operation test is performed in a state where the rollers are not connected to each other but are independent as in the conventional device, the left and right wheels are inspected. The difference in the braking force causes a difference in rotation speed between the wheels, and the difference in rotation speed increases and the difference in rotation is not eliminated even if the difference exceeds a predetermined value. When the inspection is performed by such an inspection device, antilock control is performed based on the deceleration of the wheel with the weak braking force, which is the high-speed rotation side, from the time when the rotation speed difference exceeds the predetermined value, and the braking force is increased. There is a problem that it is not possible to determine whether the antilock control based on the stronger wheel is normal.

A motor is attached to each roller, and the antilock brake is inspected in a state where a driving force is applied to the roller by the motor.
This is known from JP-A-148649. With this configuration, even if a difference in rotation speed occurs between the wheels due to a difference in braking force, if the hydraulic pressure of the brake is reduced, the rotation of the roller is increased by the motor to increase the rotation speed. Although the difference does not increase, there is a problem in that the size of the device is increased due to the installation of the motor and the motor must be controlled.

Therefore, in view of the above problems, it is an object of the present invention to provide an apparatus capable of inspecting an antilock brake without attaching a motor to a roller even if braking forces of left and right wheels are different.

[0007]

[Means for Solving the Problems] In order to achieve the above object,
The present invention is provided with each roller on which each wheel of an automobile is placed, and in a device for running an automobile with each wheel placed on each roller to inspect the operation of an anti-lock brake mounted on the automobile, the left and right rollers are It is characterized in that they are connected to each other via a connecting means for releasing the connection when a torque of a predetermined torque or more is applied.

[0008]

When the wheels of the automobile are driven to increase the rotation speed of the rollers to a predetermined speed, the rollers are connected to each other and rotate in synchronization with each other. When the brakes are applied in this state and braking force is applied to the wheels, the rotation speed of the roller is reduced, but when the braking force on either the left or right wheel is greater than the braking force on the other wheels, it corresponds to the difference in braking force. The torque that acts on the clutch acts on the clutch, and when the magnitude of this torque exceeds a predetermined torque, the connection between the left and right rollers is released. As a result, the left and right wheels are independently decelerated, and when one deceleration exceeds a predetermined value, the antilock function is activated to reduce the hydraulic pressure of the brake and weaken the braking force. Then, the magnitude of the torque acting on the clutch becomes equal to or less than a predetermined value, and the left and right rollers are again synchronized with each other so that the rotational speed difference between the two wheels is not always increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, an inspection apparatus according to the present invention is
A pair of left and right rollers 11 and 11 for the front wheels and a pair of right and left rollers 12 and 12 for the rear wheels are provided.
A gear box 31 in which the rollers 11 are connected to each other via clutches 21 is arranged between the rollers 11 and the rollers 12 for the rear wheels are connected to the clutches 2 between the rollers 11 and 12 respectively.
A gearbox 32 connected via 2 is arranged, both gearboxes 31 and 32 are connected via a drive shaft 4, and when the vehicle is run with each wheel mounted on each roller, the front wheels, which are the drive wheels, are driven. By the rotation, the rear wheel is rotated through the roller 11, the clutch 21, the gearbox 31, the drive shaft 4, the gearbox 32, the clutch 22 and the roller 12 in that order. In addition, each roller 11
The reference numeral 12 is composed of a pair of front and rear split rollers 1a and 1b that are connected to each other via a belt 5 so as to rotate synchronously, and set a large friction coefficient on the outer peripheral surfaces of both split rollers 1a and 1b. The rotational moments of inertia of the rollers 1a and 1b are set to be equal to each other and the total rotational moment of inertia is set to be slightly larger than the rotational moment of inertia of each wheel.
In contrast, the slip did not substantially occur. Further, a flywheel 6 is connected to the rear divided roller 1b of each roller 11 and 12, and a torque meter 7 is provided between the divided roller 1b and the flywheel 6 so that each roller 11
Is detected as the torque, and the detection signal of the torque meter 7 is input to the monitor circuit 8 including a microcomputer to detect the torque fluctuation.

The rollers 11 and 11 for the front wheels are provided on the fixed base 9, and the rollers 12 and 12 for the rear wheels are provided on the slide base 10 which can be moved back and forth, and the rear portion of the drive shaft 4 is sleeved. 4a and spline shaft 4b fitted to this
By using the and, the structure is made flexible so that the distance between the roller 11 for the front wheels and the roller 12 for the rear wheels can be adjusted by the movement of the slide table 10 in accordance with the distance between the axes of the automobile. Then, when inspecting the brake, attach each wheel to each roller 11
1 2 Place the vehicle on the top of the vehicle to drive it, and press the brake pedal when the vehicle reaches a predetermined speed. by the way,
The clutches 21 and 22 have a torque limiter function and are set to be disengaged when a torque larger than a predetermined torque acts.

With reference to FIG. 2, an example of a case where the braking force on the left side of the front wheel is larger than the braking force on the right side is shown with reference to FIG. Explained. As described above, when the vehicle travels to reach a predetermined speed, the rotational speeds V of the rollers 11 and 11 are both va, and by depressing the brake pedal at the point a, both rollers 11 due to the braking force of the wheels.・ 1
The rotation speed of 1 both decreases. At this time, since the braking force on the left side is larger, the torque due to the difference in the braking force acts on the clutch 21 connecting the rollers 11 and 11 and when this torque exceeds the predetermined torque, the clutch 21 The engagement is released (point b). As a result, both rollers 11
Since the rotation speed of 1 is not synchronized, the curve L showing the change of the rotation speed of the roller on the left side is lower than the curve R showing the change of the rotation speed of the roller on the right side in FIG. When the deceleration of the rotation speed of the left wheel exceeds a predetermined value, the antilock function of the brake operates, the hydraulic pressure for operating the brake is reduced, and the braking force decreases (Rc · Lc
point). Due to this reduction of the braking force, the torque acting on the clutch 21 becomes less than a predetermined torque and the left and right rollers 11
Since 11 is connected, the rotation speed of the left roller is increased to synchronize with the rotation speed of the right roller, while the right roller is decelerated in reverse to accelerate the left roller. The rotation speed is synchronized (point d). In this way, after the rotation speeds of both rollers 11 1 1 1 are synchronized, the hydraulic pressure of the brake is increased by the antilock function and the braking force is restored, and the rotation speed of both rollers 1 1 1 1 1 is further reduced, and the torque acting on the clutch is increased. When exceeds a predetermined torque, the connection is released again (point e).

By the way, when the anti-lock control is set based on the deceleration of the wheels on the high speed side when the rotational speed difference between the left and right wheels is equal to or greater than a predetermined value, the braking force on the wheels on the left and right sides is set. If it is weak, the left and right rollers will rotate independently of each other and the difference in rotation speed between the left and right wheels will exceed a specified value, and the wheels with weak braking force will be decelerated without reaching the deceleration at which antilock control is started. At times, even if the brakes of the wheels on the other side are normal, the antilock control of this brake is not performed, and it becomes impossible to determine the quality of the brake. On the other hand, in the above, such a problem does not occur because the difference in rotational speed between the left and right rollers, that is, the left and right wheels, is suppressed to a predetermined value or less.

The clutches 21 and 22 may be of any type as long as they have a torque limiter function, for example, an electromagnetic clutch in a half-clutch state or a so-called viscous cup that transmits torque using viscous fluid as a medium. A ring is suitable.

[0014]

As is apparent from the above description, according to the present invention, the rotational speeds of the rollers are synchronized with each other when the braking force of the brake is released even if the driving motor is not attached to the rollers. The anti-lock brake can be accurately inspected by preventing the difference in rotational speed between the two from increasing.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of the device of the present invention.

FIG. 2 is a diagram showing changes over time in the rotational speeds of the left and right rollers.

[Explanation of symbols]

 11 ・ 12 Roller 21 ・ 22 Clutch 31 ・ 32 Gearbox

Claims (1)

[Claims] 1. A device comprising: each roller on which each wheel of an automobile is placed, wherein the vehicle is run while each wheel is placed on each roller to inspect the operation of an anti-lock brake mounted on the automobile. Are connected to each other via a connecting means that releases the connection when a torque equal to or more than a predetermined torque acts on the anti-lock brake inspection device.