JPH0643940B2 - Breaker tester control device - Google Patents

Description

Detailed Description of the Invention A. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower control device for a brake tester used in a brake tester for testing the performance of a vehicle brake.

B. SUMMARY OF THE INVENTION The present invention relates to a blower control device for a brake tester,
By changing the blower speed of the blower according to the rotation speed of the variable speed motor and the operating state of the brake, it is possible to perform performance evaluation in consideration of environmental conditions during actual use. is there.

C. BACKGROUND OF THE INVENTION Vehicle brakes are of the utmost importance in ensuring vehicle safety. Therefore, a brake tester that conventionally tests the braking performance of a brake operates the brake while rotating the test target brake by a variable speed motor, and evaluates the braking performance based on the braking result at this time.
The frictional heat generated during braking is cooled by the cool air sent from the blower.

D. The problem to be solved by the invention is that in the conventional brake tester, since the speed of the cool air sent from the blower is constant, it is not possible to create the same cooling environment as when the vehicle is actually running, and the performance is poor. There was a problem that the evaluation content was poor.

The present invention has been made to solve such a problem, and an object thereof is to provide a blower control device for a brake tester that can perform performance evaluation in consideration of environmental conditions during actual traveling.

E. MEANS FOR SOLVING THE PROBLEMS The present invention is adapted to change the blower speed of a blower according to the rotation speed of a brake that can be rotated and the operating state of the brake.

F. Function The blower speed of the blower is increased / decreased when the brake is activated or deactivated in accordance with the increase / decrease in the rotational speed of the brake to be rotated.

G. Embodiment FIG. 1 is an overall block diagram showing an embodiment of the present invention, in which a brake 1 to be tested is rotated by a variable speed motor 2. On the other hand, the entire brake 1 is operated by the blower controller 3
It is cooled by cold air from the blower 4 which is rotationally driven by. The brake 1 operates by receiving a brake command from the outside.

FIG. 2 is a circuit diagram showing the internal configuration of the blower control unit,
Here, the constant wind speed command SA the no-wind command during braking SB the constant no-wind command SC the medium speed follow-up command SD the constant speed follow-up command SE the non-brake all-speed command SF the all-brake speed command SG is given individually by relay RF or RA
When the brake command BRK is given, the relay RB is operated.

That is, relay RA operates unconditionally when commands SA and SD are given, and relay RB is not operated when commands SB, SF and SG are given (that is,
Operates (when not braking). On the other hand, the relay RF is command S
If F and SG are given, the relay RB is activated if it is not activated. Further, the relay RS has commands SA, SB,
When SC, SF and SG are given, it operates unconditionally, and when command SD is given, it operates if relay RB is not in operation.

Of these relays RS, RA, RF, the normally open contact of the relay RA is connected between the output of the wind speed setting device 30 and the normally open contact of the relay RS. The normally open contact of the relay RF is connected between the full speed setter 31 and the normally open contact of the relay RS. On the other hand, the output of the speed command generating circuit 32 is connected to the normally closed contact of the relay RS. The speed detection value N of the variable speed motor 2 and the output of the proportional coefficient setter 33 are input to the speed command generation circuit 32, and the speed corresponding to the product of the speed detection value N and the proportional coefficient K is reached. The command signal KN is generated.

On the other hand, by controlling the current of the motor 40 of the blower 4 to the common terminal of the normally open contact and the normally closed contact of the relay RS,
A motor current control circuit 34 for varying the blow speed of the blower 4 is connected.

Therefore, for example, when the command SA is given, the relays RA and RS
Both of them operate, and the motor current control circuit 34 has a wind speed setting device.
30 output signals are input. Therefore, the motor 40 rotates at the constant speed set by the wind speed setter 30.

Further, when the command SB is given, the relays RS and RA are activated, so the motor 40 rotates at a constant speed set by the wind speed setter 30, but if the brake command BRK is given at this time, only the relay RS is activated. And the motor
Forty rotations stop. That is, there is no wind during braking.

Moreover, when the command SC is given, only the relay RS operates,
Since the other relays RF and RA do not operate, the rotation of the motor 40 is stopped. That is, there is always no wind.

Further, when the command SD is given, the relays RS and RA are activated, and the motor 40 rotates at a constant speed set by the wind speed setter 30, but at this time, when the brake command BRK is given,
Since the relay RS is deactivated, the relay RS rotates at a speed corresponding to the speed command signal KN. That is, only during braking, the variable speed motor 2 rotates at a speed that follows the speed of the variable speed motor 2.

Further, when the command SE is given, none of the relays are activated, so that the motor 40 rotates according to the speed command signal KN. That is, the motor always rotates at a speed that follows the speed of the variable speed motor 2.

Further, when the command SF is given, all of the relays RS, RA, and RF are activated, so that the motor 40 rotates at the maximum speed set by the full speed setter 31, but at this time, the brake command BRK is given. Since only the relay RS is in the operating state, the rotation of the motor 40 is stopped. That is, it rotates at the maximum speed only when the brake is not applied.

When the command SG is further given, the motor 40 rotates at the constant speed set by the wind speed setter 30 even if the relays RS and RA are activated, but when the brake command BRK is given, the relay RA is given.
Instead, the relay RF is activated, so that the motor 40 rotates at the maximum speed set by the full speed setter 31.

Therefore, by appropriately selecting and giving the commands SA to SG, it is possible to create a blowing condition similar to that in actual use.

H. As described above, in the present invention, the blower speed of the blower is changed according to the rotation speed of the variable speed motor that rotates the brake and the operating state of the brake. Therefore, it is possible to create the ventilation condition of, and to evaluate the brake performance in consideration of the environment during actual driving.

[Brief description of drawings]

FIG. 1 is an overall block diagram showing an embodiment of the present invention.
The figure is a diagram showing a detailed configuration of the blower control device. 1 ... Brake, 2 ... Variable speed motor, 3 ... Blower control unit,
4 ... Blower.

Claims (1)

[Claims] 1. A brake tester comprising a variable speed motor for rotating a vehicle brake and a blower for sending cold air to the brake, wherein a blower control unit for rotationally driving the blower is provided, and the blower control unit is a blower control unit. A motor current control circuit for rotating the motor, a full speed setter and a wind speed setter, and an output signal of these setters or a speed command signal that follows the speed of the variable speed motor. A relay contact inserted in a passage for supplying the constant current speed command signal S to the motor current control circuit.
A, no-breathing command SB during braking, constantly no-winding command SC, speed following command SD during braking, constant speed following command SE, full speed command during non-brake SF, full speed command during braking SG, given among these commands, SA, SB, SC, SF, S
A blower control device for a brake tester, which operates unconditionally with a G command and is activated only when a boulek command is not given when an SD command is given.