JPH0650754Y2 - Brake braking test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a braking test device for a brake, in particular for an automobile.

[Conventional technology]

A first example of a braking test device for a vehicle brake according to the related art is, as shown in FIG. 5, a fifth wheel of a constant circumferential length for detection which rotates in contact with a running surface is coupled to the vehicle, A pulse generator 1 is provided on a wheel axle, and a pulse signal from the pulse generator 1 is converted into an analog signal via a frequency-voltage converter 10 together with a pulse signal directly from the pulse generator 1 to a high speed recorder 30, for example, It is designed to be input to pen-written oscillographs and electromagnetic oscillographs.

Since the analog signal becomes speed data and the number of pulses of the pulse signal itself becomes travel distance data and is recorded together with the recording time, the deceleration time between predetermined speeds, that is, the braking time and the braking distance can be read from the recording chart. .

Similarly, in the second example, as shown in FIG. 6, the pulse generator 1 is provided on the axle (not shown) of the fifth wheel having a constant circumferential length, which is coupled to the automobile and rotates in contact with the traveling surface, and the gate is provided. The control circuit 4 is connected to the first counter 6 via the AND circuit 5 together with the pulse generator 1, and is also connected to the second counter 9 via the AND circuit 8 together with the separately provided clock pulse generator 7. ing.

Then, a brake operation signal from a pressure switch provided on the brake petal itself or a limit switch opened and closed by the operation of the brake petal, an operation signal of a brake lamp, or the like is connected so as to be input to the gate control circuit 4 as a brake start signal. ing. Further, when the pulse interval of the pulse signal of the pulse generator 1 is, for example, 0.2 seconds or more, it is regarded as the stop of the vehicle, and the signal detected is input to the gate control circuit 4 as a stop signal. It is connected.

While the vehicle is running, a pulse signal of a number N corresponding to the distance traveled is generated by the pulse generator 1 at a frequency F0 proportional to the travel speed V0.
Is output from.

For example, the output C of the gate control circuit 4 which is a flip-flop circuit remains at a low level while the vehicle is running, but a braking operation is performed during the running and a brake start signal is input to the gate control circuit 4. Then, when the stop signal is input to the gate control circuit 4, it returns to the low level again.

The output C of the gate control circuit 4 is input to the AND circuits 5 and 8,
The AND circuits 5 and 8 are opened only while the output C is at high level, and AND
The circuit 5 conducts the pulse signal from the pulse generator 1 to the first counter 6, and the AND circuit 8 conducts the clock pulse signal from the clock pulse generator 7 to the second counter 9.

Therefore, the pulse signal from the pulse generator 1 from the braking start time T1 to the vehicle stop time T2 while the vehicle is running is counted by the first counter 6, and the clock pulse signal from the clock pulse generator 7 is counted by the second counter 6. It is counted in the counter 9. The count number of the first counter 6 represents the traveling distance from T1 to T2, and the count number of the second counter 9 represents the elapsed time from T1 to T2.

Therefore, the required mileage and the required time required for the automobile to stop after the brake to be tested is activated are obtained. That is, the braking performance of the tested brake is required.

[Problems to be solved by the device]

The first example of the braking test device for a vehicle brake according to the above-mentioned conventional technique has low accuracy, and it takes time and labor to analyze the data.

In the second example, since it is impossible to measure the predetermined traveling distance and the required time in an arbitrary predetermined speed change section, the test conditions are limited.

The present invention provides a highly accurate brake braking test device in which a braking time, a braking distance, etc. in an arbitrary predetermined speed change section are directly obtained.

[Means for Solving the Problems]

A braking test device for a brake according to the present invention is a pulse generator, a clock pulse generator, which outputs a pulse signal in response to rotation of a fifth wheel having a predetermined peripheral length for detection, which is coupled to an automobile and rotates while contacting a running surface. Each of the comparators that compares the frequency of the pulse signal from the pulse generator proportional to the traveling speed with the frequency corresponding to each of a plurality of set speeds lower than the traveling speed, and traveling during deceleration according to the comparison result in the comparator It comprises a detection means for detecting a time point when the speed is equal to one set speed and a time point where the speed is equal to another set speed, and a counter for counting the number of pulse signals and the number of clock pulse signals output between the both time points. ing.

[Action]

While the vehicle is traveling, a pulse signal of a number N corresponding to the traveling distance is output from the pulse generator at a frequency F0 proportional to the traveling speed V0. The value N0 corresponding to the frequency F0 is the set value N1 corresponding to the first speed set value V1 in one comparator and the set value corresponding to the second speed set value V2 in the other comparator.
It is compared with N2 (N2 <N1) respectively.

When N0> N1 (N0> N2), there is no output signal from both comparators.

The braking operation is performed while the vehicle is running, and the vehicle is decelerated, that is, N0 is reduced. When N0 = N1, one of the comparators outputs the signal A, and the other comparator of N0 = N2 outputs the signal B.

The signal A and the signal B are used to detect when the traveling speed during deceleration is equal to one set speed and when the traveling speed is equal to another set speed.

Then, from the time T1 when the vehicle is braked while traveling at the speed V0 and the speed is reduced to the first speed setting value V1 to the time T2 when the speed is further reduced to the second speed setting value V2, The counter counts the pulse signal and the clock pulse signal from the clock pulse generator.

The count number of the pulse signal from the pulse generator is from T1.
It represents the traveling distance to T2, and the count number of the clock pulse signal represents the elapsed time from T1 to T2.

The required braking distance and the required time required to decelerate the vehicle from a predetermined speed to another predetermined speed are determined by the brake to be tested. That is, the braking performance of the tested brake is required.

〔Example〕

 An embodiment of this invention will be described with reference to the drawings.

The brake braking test device is an axle (not shown) of a fifth wheel having a constant circumferential length, which is connected to an automobile and rotates while contacting a running surface.
As shown in FIG. 1, a first comparison unit 2 and a second comparison unit 3 are connected to the pulse generator 1 provided in the first comparison unit 2 and a pulse signal is input thereto. And the second
The comparators 3 are connected to the gate control circuit 4, respectively.

The gate control circuit 4 includes an AND circuit 5 together with the pulse generator 1.
Is connected to the first counter 6 via the AND circuit, and is also connected to the second counter 9 via the AND circuit 8 together with the separately provided clock pulse generator 7.

First, the comparison unit of the first embodiment shown in FIG. 2 is an analog type, and in the first comparison unit 2, the F / V converter (frequency-
The first analog comparator 11 is connected to the speed converter 10 and the second analog comparator 12 is connected to the F / V converter 10 in the second comparing section 3, and the first analog comparator 11 and the second analog comparator 11 are connected. A first analog setting device 13 and a second analog setting device 14 such as potentiometers are connected to the analog comparator 12. The F / V converter 10 is connected so that the pulse signal from the pulse generator 1 is input, and the first analog comparator 11 and the second analog comparator 12 are respectively connected to the gate control circuit 4. Connected to output a signal.

Next, the comparison unit of the second embodiment shown in FIG. 3 is of a digital type, and in the first comparison unit 2, the counter 15
The digital comparator 16 is connected, and in the second comparing section 3, the counter 15 is connected to the second digital comparator 17,
A first digital setter 18 and a second digital setter 19 are connected to the first digital comparator 16 and the second digital comparator 17, respectively.

The counter 15 is connected so that the pulse signal from the pulse generator 1 is input through the AND circuit 21 to which the timing signal generator 20 is connected, and the reset signal is directly input from the timing signal generator 20. Are connected as they are.

The first digital comparator 16 and the second digital comparator 17 are connected to the gate control circuit 4 so as to output respective signals.

In the second embodiment, when the number of pulses of the pulse signal of the pulse generator 1 per one rotation of the fifth wheel is small, a multiplying means may be provided between the pulse generator 1 and the AND circuit 21.
That is, the pulse generator 1, the frequency / voltage converter, the voltage / frequency converter, and the AND circuit 21 are sequentially connected to increase the frequency per unit voltage in the voltage / frequency converter.

The operation and action of the above brake braking test device will be described.

In FIG. 1, while the vehicle is traveling, the pulse generator 1 outputs a number N of pulse signals corresponding to the traveling distance at a frequency F0 proportional to the traveling speed V0. The value N0 corresponding to the frequency F0 is the setting value N1 corresponding to the first speed setting value V1 in the first comparing section 2 and the second speed setting value in the second comparing section 3.
The set values N2 (N2 <N1) corresponding to V2 are respectively compared.

When N0> N1 (N0> N2), there is no output signal from the first comparison unit 2 and the second comparison unit 3.

The braking operation is performed while the vehicle is running, and the vehicle is decelerated, that is, N0 is reduced. When N0 = N1, the signal A is output from the first comparing section 2, and the signal B is further output from the second comparing section 3 when N0 = N2.

The gate control circuit 4 is, for example, a flip-flop circuit, and its output C initially remains low level.
When the signal A, which is the first signal, is input from the comparison unit 2, the level becomes high. Then, when the signal B, which is the second signal, is input from the second comparison section 3, it returns to the low level again.

The output C of the gate control circuit 4 is input to the AND circuits 5 and 6,
AND circuit 5 and 6 are opened only while output C is high
The circuit 5 conducts the pulse signal from the pulse generator 1 to the first counter 6, and the AND circuit 8 conducts the clock pulse signal from the clock pulse generator 7 to the second counter 9.

Therefore, from the pulse generator 1 from the time T1 when the vehicle is braked while traveling at the speed V0 and the speed is reduced to the first speed setting value V1 to the time T2 when the speed is further reduced to the second speed setting value V2. Pulse signals are counted by the first counter 6, and clock pulse signals from the clock pulse generator 7 are counted by the second counter 9. First counter 6
The count number of represents the traveling distance from T1 to T2, and the count number of the second counter 9 represents the elapsed time from T1 to T2.

The required braking distance and the required time required to decelerate the vehicle from a predetermined speed to another predetermined speed are determined by the brake to be tested. That is, the braking performance of the tested brake is required.

The comparison operation of the first comparison unit 2 and the second comparison unit 3 will be described in more detail. When the comparison unit is of the analog type as shown in FIG. 2, the pulse signal from the pulse generator 1 is: The frequency of the pulse signal corresponding to the traveling speed, which is input to the F / V converter 10, is converted into the corresponding voltage signal, and the first analog setting device 13 and the second analog setting device
The voltage values corresponding to the predetermined speeds respectively set in 14 are compared in the first analog comparator 11 and the second analog comparator 12.

As shown in FIG. 3, when the first comparing section 2 and the second comparing section 3 are of the digital type, the output of the timing signal generator 20 is input to the AND circuit 21 and its output is at a high level. The AND circuit 21 is opened only for a while, and the AND circuit 21
The pulse signal from the pulse generator 1 is conducted to the counter 15. And a timing signal generator for each predetermined counting time
The low level signal from 20 is directly input to the counter 15 as a reset signal.

Therefore, the pulse signal from the pulse generator 1 in the interval of the reset signal is counted by the counter 15. The count value represents the number of pulses of the pulse signal of the pulse generator 1 per unit time, that is, the traveling speed, and the numerical values corresponding to the predetermined speeds set by the first digital setting device 18 and the second digital setting device 19, respectively. First digital comparator 16
And a second digital comparator 17 for comparison.

In the first analog setting device 13, the second analog setting device 14, the first digital setting device 18, and the second digital setting device 19 in both of the above embodiments, the traveling speed V = V0 of the automobile to the stop V = 0. A value corresponding to any speed can be set.

As another embodiment, a fourth embodiment in which the gate control circuit 4 and the AND circuits 5 and 8 in the first and second embodiments are not used.
There are types as shown in the figure.

The first comparing unit 2 is the first differentiating circuit 22, and the second comparing unit 3 is the second
The first differentiating circuit 22 is connected to the differentiating circuit 23, respectively, and the first differentiating circuit 22 is connected to the first counter 6 and the second counter 9.
23 is connected to the respective latch circuits 24 and 25 together with the first counter 6 and the second counter 9.

In FIG. 4, as in the case of FIG. 1, the braking operation is performed while the vehicle is traveling at the speed V0, and the vehicle is decelerated to the first speed set value V1. Is output, and the signal B is output from the second comparison unit 3 at time T1 when the speed is further reduced to the second speed setting value V1.

The outputs from the respective comparison units 2 and 3 are differentiated by the first differentiating circuit 22 and the second differentiating circuit 23, and a differential signal that captures the rising time of each output is output. When the differential signal from the first differentiating circuit 22 is input to the first counter 6 and the second counter 9, the counters 6 and 9 are reset to zero, and the pulse signals from the pulse generator 1 and the clock pulse generator 7 are output. Counting is restarted, and the respective count numbers are input to the latch circuits 24 and 25. When the differential signal from the second differentiating circuit 23 is input to the latch circuits 24 and 25, the respective count numbers from the first counter 6 and the second counter 9 are latched.

[Effect of device]

According to the braking test device for a vehicle brake of the present invention,
The deceleration required time and the deceleration required distance in any speed change section from the start of the braking operation to the stop can be immediately measured automatically and with high accuracy. Therefore,
Accurate test results of the braking performance depending on the operating conditions are immediately obtained in the braking operation.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a braking test device for a vehicle brake according to an embodiment of the present invention, and FIG. 2 is a partial configuration diagram of a braking test device for an upper vehicle brake according to a first embodiment of the present invention. FIG. 3 is a partial configuration diagram of a braking test device for a vehicle brake according to the second embodiment of the present invention, and FIG. 4 is a modified configuration part of a braking test device for a vehicle brake according to the first and second embodiments of the present invention. FIG. 5, FIG. 5 and FIG. 6 are schematic configuration diagrams of a braking test device for a vehicle brake according to a conventional technique. 1: pulse generator, 2: first comparison unit, 3: second comparison unit 4: gate control circuit, 5,8,21: AND circuit 6: first counter, 7: clock pulse generator 9: second counter , 10: F / V converter 11: first analog comparator, 12: second analog comparator 13: first analog setter, 14: second analog setter 15: counter, 16: first digital comparator 17 : Second digital comparator 18: First digital setter 19: Second digital setter 20: Timing signal generator 22: First differentiation circuit, 23: Second differentiation circuit 24, 25: Latch circuit

Claims (1)

[Scope of utility model registration request] 1. A pulse generator, a clock pulse generator, and a traveling speed, which are connected to an automobile, and which output a pulse signal in response to rotation of a fifth wheel having a predetermined circumferential length for detection, which rotates in contact with a traveling surface. Each comparator that compares the frequency of the pulse signal from the proportional pulse generator with the frequency corresponding to each of a plurality of set speeds lower than the traveling speed, and the traveling speed during deceleration is set to one by the comparison result in the comparators. Braking test of a brake comprising a detection means for detecting a time point equal to a speed and another time point equal to a set speed, and a counter for counting the number of pulse signals and the number of clock pulse signals output between the both time points. apparatus