CN215640107U - Brake test system - Google Patents
Brake test system Download PDFInfo
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- CN215640107U CN215640107U CN202122251496.8U CN202122251496U CN215640107U CN 215640107 U CN215640107 U CN 215640107U CN 202122251496 U CN202122251496 U CN 202122251496U CN 215640107 U CN215640107 U CN 215640107U
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- electromagnetic valve
- rotating speed
- way electromagnetic
- programmable controller
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Abstract
The utility model discloses a brake testing system which is used for testing performances of a brake such as brake frequency, brake response time, brake release time and the like. The device is provided with a motor, wheels, a brake, a programmable controller, a two-way electromagnetic valve and a rotating speed sensor. The motor is in driving connection with a wheel; the brake is connected with the wheel in a braking mode; the two-way electromagnetic valve is connected with the brake through a gas path; the programmable controller is electrically connected with the motor, the two-way electromagnetic valve and the rotating speed sensor; the rotating speed sensor measures the rotating speed of the wheel and transmits the rotating speed to the programmable controller; and the programmable controller controls the on-off frequency of the two-way electromagnetic valve. The utility model can carry out the test by setting up a simple test system, and the adopted method is simple and easy to implement.
Description
Technical Field
The utility model relates to a brake testing technology, in particular to a brake frequency, brake response time and other testing system.
Background
The national mandatory standard GB 7258-2017 motor vehicle operation safety technical condition puts requirements on brake response time, automobile brake complete release time and the like. "7.1.6 car brake complete release time (time required from brake pedal release to brake release) should be less than or equal to 0.8s for a two-axle car and less than or equal to 1.2s for a three-axle and above car. "7.2.10 adopts the car of air brake, when testing according to the method stipulated in GB12676, should be less than or equal to 0.6s from stepping on the brake pedal to the most unfavorable brake chamber response time, and should be less than or equal to 0.4s from stepping on the brake pedal to the response time of the main inter-hanger air pressure control pipeline joint extension pipeline end to the car with traction function; when the trailer adopting air braking is tested according to the method specified in GB12676, the response time from the air pressure control pipeline joint between the main hangers to the most unfavorable brake air chamber is less than or equal to 0.4 s. "where the minimum time accuracy is 0.01 s. Anti-lock brake system (ABS) puts higher demands on the response frequency of the brake, especially with the development of intelligent technologies such as automatic vehicle driving, the demand of the Automatic Emergency Brake System (AEBS) on the response of the brake reaches millisecond level. And whether the brake is a drum brake or a disc brake, the actuating part of the brake comprises a rigid and elastic mechanism, and the test consistency of the maximum brake response frequency is difficult.
The existing method detects the response time and the brake release time of the brake by adopting a method for measuring the pressure of a brake air chamber of the brake, indirectly reflects the actual brake response effect of the brake, and cannot further test the actual response time and the highest brake response frequency of the brake.
In addition, the traditional detection method needs to modify the brake loop of the brake to be detected, the working effect of the brake is influenced to a certain extent, and the problems of inconsistent detection result scales and inaccuracy can be caused due to modification differences and operation differences of different detection mechanisms.
SUMMERY OF THE UTILITY MODEL
To this end, the present invention provides a brake test system. The system adopts a motor to drive a transmission system to simulate the running process of a vehicle, adopts a high-pressure air pump to connect a brake to simulate the braking process, adopts a programmable controller to control a high-frequency electromagnetic valve to control the braking frequency, adopts a rotating speed sensor to collect a vehicle speed signal, and measures the braking frequency, the braking response time and the like of the brake through the braking frequency signal, the vehicle speed change signal and the braking start-stop time.
The technical scheme adopted by the utility model is as follows: a brake test system comprises a motor, wheels, a brake, a programmable controller, a two-way electromagnetic valve and a rotating speed sensor;
the motor is in driving connection with a wheel;
the brake is connected with a wheel in a braking mode;
the two-way electromagnetic valve is connected with the brake through a gas path;
the programmable controller is electrically connected with the motor, the two-way electromagnetic valve and the rotating speed sensor;
the rotating speed sensor measures the rotating speed of the wheel and transmits the rotating speed to the programmable controller; and the programmable controller controls the on-off frequency of the two-way electromagnetic valve.
Further, the motor is connected with the wheels through a fluid coupling, and the programmable controller controls starting and stopping of the motor.
Furthermore, the brake is an air pressure brake, air is supplied by an air pressure pump, and the two-way electromagnetic valve is connected between the air pressure pump and the brake.
Furthermore, the programmable controller inputs a control instruction and displays a result through a human-computer interaction interface.
Furthermore, the programmable controller controls the on-off frequency of the two-way electromagnetic valve to be adjustable.
The utility model has simple structure, can carry out the test by building a simple test system, and can calculate the brake response time, the brake release time and the brake frequency only by the on-off frequency of the electromagnetic valve, the on-off time of the brake and the rising/falling time of the rotating speed of the wheel in the test process of the collected data information.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the utility model, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a diagram of a brake testing system.
Detailed Description
The utility model is described in detail below with reference to the drawings, which form a part hereof, and which are shown by way of illustration, embodiments of the utility model. However, it should be understood by those skilled in the art that the following examples are not intended to limit the scope of the present invention, and any equivalent changes or modifications made within the spirit of the present invention should be considered as falling within the scope of the present invention.
As shown in fig. 1, a brake test system is constructed as follows: the device comprises a motor 1, a fluid coupling 2, wheels 3, a rotating speed sensor 4, a pneumatic pump 5, a brake 6, a two-way electromagnetic valve 7, a programmable controller 8 and a human-computer interaction interface 9.
An output shaft of the motor 1 is connected with an input shaft of the fluid coupling 2, an axle of the wheel 3 is connected with an output shaft of the fluid coupling 2, the power of the motor 1 is transmitted to the wheel 3 through the fluid coupling 2, and the motor 1 provides driving force for the wheel 3 to simulate the running of a vehicle.
The pneumatic pump 5 is connected with the brake 6 through an air path, the brake 6 is connected with the wheel shaft of the wheel 3, and the brake 6 provides braking force for the wheel 3 to simulate vehicle braking.
The rotating speed sensor 4 is arranged at the wheel edge of the wheel 3, measures the rotating speed of the wheel in real time, and transmits a rotating speed signal to the programmable logic controller 8 (PLC).
A two-way electromagnetic valve 7 is arranged on the air path of the brake 6, and the two-way electromagnetic valve 7 is controlled to be opened and closed (i.e. switched on and off) by a programmable controller 8. The two-way electromagnetic valve 7 is intercepted on the air passage of the brake 6, the on-off of the air passage is controlled, the working state of the brake 6 is also determined, when the two-way electromagnetic valve 7 is connected with the air passage, the brake 6 executes the braking, and when the two-way electromagnetic valve 7 is disconnected with the air passage, the brake 6 does not execute the braking.
The programmable controller 8 is connected with the motor 1, the rotating speed sensor 4 and the two-way electromagnetic valve 7 in a control mode, inputs control instructions and display results through the human-computer interaction interface 9, and can control the torque of the motor 1 and the on-off frequency of the two-way electromagnetic valve 7.
The utility model simulates the running of the vehicle by setting the system, including running and braking, the programmable controller 8 plays a role of central control, the rotating speed sensor 4 is arranged at the wheel to transmit the rotating state of the wheel in real time, the two-way electromagnetic valve 7 is arranged on the braking air path, the air pressure pump 5 is connected with the two-way electromagnetic valve 7 through the air path, the two-way electromagnetic valve 7 is connected with the brake 6 through the air path, when the two-way electromagnetic valve 7 is opened, the air path is unblocked, the air pressure pump 5 provides the braking pressure for the brake 6, and the brake 6 performs the braking action; when the two-way solenoid valve 7 is closed, the brake 6 ends the braking operation. The opening or closing frequency (on-off frequency) of the two-way electromagnetic valve 7 can be controlled by the programmable controller 8, the two-way electromagnetic valve 7 is controlled by the programmable controller 8 to be on or off according to a certain frequency, and the brake 6 executes braking according to a certain frequency.
By controlling different devices and different opportunities through the programmable controller 8, three tests can be realized, namely a brake response time test, a brake release time test and a brake frequency test.
1. Brake response time test
The wheel 3 is driven by the motor 1 to rotate at a constant rotating speed, then the programmable controller 8 controls the two-way electromagnetic valve 7 to be opened, the two-way electromagnetic valve is in a connected state, the brake 6 performs a braking action at the moment, the rotating speed of the wheel 3 is reduced due to the braking action of the brake 6, and the rotating speed sensor 4 transmits a rotating speed signal to the programmable controller 8 in real time. The programmable controller 8 can obtain the brake response time of the brake by recording the opening time of the two-way electromagnetic valve 7 and the triggering time of the rotating speed falling edge of the wheel 3, and the calculation formula is as follows:
tr＝td-to (1)
in the formula, tr-brake braking response time;
to-the moment of opening of the two-way solenoid valve;
td-wheel speed falling edge trigger time.
2. Brake release time test
The two-way electromagnetic valve 7 is in a connection state firstly, the brake 6 executes braking action in the state, and the rotating speed of the wheel 3 is gradually reduced to zero under the action of braking force; then the programmable controller 8 controls the two-way electromagnetic valve 7 to close the air path, the brake 6 finishes the braking action, the motor 1 drives the wheel 3 to start rotating again, the rotating speed sensor 4 transmits the wheel rotating speed signal to the programmable controller 8 in real time, the programmable controller 8 can obtain the brake release time of the brake by recording the closing time of the two-way electromagnetic valve 7 and the rising edge triggering time of the rotating speed of the wheel 3, and the calculation formula is as follows:
ts＝ti–tc (2)
in the formula, ts-brake release time;
tc-the moment of closure of the two-way solenoid valve;
tiwheel speed rising edge trigger moment.
3. Brake frequency testing
(1) Actual braking frequency
Setting a brake 6 to brake according to a fixed braking frequency, and analyzing: when the brake 6 brakes according to the fixed braking frequency, the wheel rotating speed signal is similar to a sinusoidal signal, but the change rule of the rotating speed falling edge and the rotating speed rising edge is not a standard sinusoidal signal due to non-uniform braking and uniform starting, so the braking frequency cannot be measured by the change of the wheel rotating speed signal; but the characteristics of the change period and the wave crest and the wave trough of the wheel rotating speed signal conform to the characteristics of a sinusoidal signal.
Therefore, when the programmable controller 8 is in the braking frequency test mode, the two-way solenoid valve 7 is always opened and closed (on and off) according to a certain fixed frequency, and the rotating speed signal of the rotating speed sensor 4 is recorded at the same time, the actual braking frequency of the brake can be obtained by counting the number of wave crests or wave troughs of the rotating speed curve in a certain time period, and the calculation is carried out according to the following formula:
f＝a/t (3)
wherein, f is the actual braking frequency of the brake;
t- -test time period(s);
a- -the number of peaks or valleys in the test period.
Further, F is generally rounded up, and the rounding result F is taken as the test result:
F＝[f]
(2) maximum braking frequency
The programmable controller 8 controls the on-off of the two-way electromagnetic valve 7 at a certain frequency.
If the on-off frequency f of the two-way solenoid valve 7 is lower0When the actual braking frequency f of the brake 6 is less than or equal to the actual braking frequency f, the brake 6 is proved to have the working capacity, the brake 6 can work at the actual braking frequency f, the on-off frequency of the two-way electromagnetic valve 7 can be gradually increased at the moment, the on-off frequency is gradually increased by taking T as an increasing step length until the on-off frequency of the two-way electromagnetic valve 7 is increased to f0+nT，f0When + nT is larger than f, the actual working frequency f of the brake 6 can not keep up with the on-off frequency of the two-way electromagnetic valve 7, and the brake 6 has no working capacity. Thus, f will be0Frequency f of + nT previous period0And n-1T is the maximum braking frequency of the brake 6, and n is more than or equal to 1. The step length T is typically 1 Hz.
If the on-off frequency f of the two-way electromagnetic valve 7 is started0If the actual braking frequency f of the brake 6 is higher than the actual braking frequency f of the brake 6, the braking frequency of the brake 6 cannot keep up with the on-off frequency of the two-way electromagnetic valve 7, the brake 6 cannot work, and the on-off frequency needs to be gradually reduced until f0-nT < f, until the brake 6 can be activated, then f0-nT is taken as the maximum braking frequency of the brake 6.
Therefore, by the idea of frequency sweeping, let f0The frequency is gradually increased or decreased until the frequency is closest to f, and the maximum braking frequency of the brake 6 can be determined.
Claims (5)
1. A brake test system, includes motor, wheel, stopper, its characterized in that: the device also comprises a programmable controller, a two-way electromagnetic valve and a rotating speed sensor;
the motor is in driving connection with a wheel;
the brake is connected with a wheel in a braking mode;
the two-way electromagnetic valve is connected with the brake through a gas path;
the programmable controller is electrically connected with the motor, the two-way electromagnetic valve and the rotating speed sensor;
the rotating speed sensor measures the rotating speed of the wheel and transmits the rotating speed to the programmable controller; and the programmable controller controls the on-off frequency of the two-way electromagnetic valve.
2. The brake testing system of claim 1, wherein: the motor is connected with the wheels through a hydraulic coupler, and the programmable controller controls the starting and stopping of the motor.
3. The brake testing system of claim 1, wherein: the brake is an air pressure brake, air is supplied by an air pressure pump, and the two-way electromagnetic valve is connected between the air pressure pump and the brake.
4. The brake testing system of claim 1, wherein: and the programmable controller inputs a control instruction and displays a result through a human-computer interaction interface.
5. The brake testing system of claim 1, wherein: the programmable controller controls the on-off frequency of the two-way electromagnetic valve to be adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122251496.8U CN215640107U (en) | 2021-09-16 | 2021-09-16 | Brake test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122251496.8U CN215640107U (en) | 2021-09-16 | 2021-09-16 | Brake test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215640107U true CN215640107U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122251496.8U Active CN215640107U (en) | 2021-09-16 | 2021-09-16 | Brake test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215640107U (en) |
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2021
- 2021-09-16 CN CN202122251496.8U patent/CN215640107U/en active Active
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