QC/T 1006-2015Technical requirements and bench test methods for pneumatic solenoid modulators of automotive anti-lock braking systems (English PDF)

3.1 Rated working pressure; Pe

The working air pressure that is specified in the technical documentation of the ABS solenoid modulator for pneumatic.

3.2 Rated working voltage; Ve

The working voltage that is specified in the technical documentation of the ABS solenoid modulator for pneumatic.

3.3 Time of pressure boosting

The time that is required for the pressure-raising stage during a braking process (with brake pressure and working voltage as the ordinate and time as the abscissa), starting from when the inlet valve of the ABS solenoid modulator for pneumatic is de-energized (before which, its exhaust valve has been de-energized), to when it is required for the outlet pressure of the ABS solenoid modulator for pneumatic to rise to 90% of the rated working pressure.

3.4 Time of pressure decompressing

The time that is required for pressure decompressing stage during a braking process (with brake pressure and working voltage as the ordinate and time as the abscissa), starting from when the intake valve and exhaust valve of the ABS solenoid modulator for pneumatic are energized at the same time (before that, the intake valve and exhaust valve have been de-energized), to when the outlet pressure of the ABS solenoid modulator for pneumatic to drop from the rated working pressure to 10% of the rated lower working pressure.

3.5 Pressure boosting starting

The process that the pressure changes from the original state to 6 kPa higher than the original state.

3.6 Pressure decompressing starting

The process that the pressure changes from the original state to 6 kPa lower than the original state pressure.

3.7 Lag time of pressure boosting

The lag time between the pressure signal and the electrical signal when the pressure boosting starting is conducted during the pressure boosting process.

3.8 Lag time of pressure decompressing

The lag time between the pressure signal and the electrical signal when the pressure decompressing starting is conducting during the pressure decompressing process.

3.9 State of pressure boosting

That is, the normal braking state. The intake valve and exhaust valve of the ABS solenoid modulator for pneumatic are both in a non-energized state.

3.10 State of pressure retaining

The state that the intake valve of the ABS solenoid modulator for pneumatic is energized and the exhaust valve is de-energized.

3.11 State of pressure decompressing

The state that both intake valve and exhaust valve of the ABS solenoid modulator for pneumatic are energized.

4.1 Winding withstand voltage characteristics

The winding of the ABS solenoid modulator for pneumatic shall not be broken down; and the leakage current between the winding wire and the iron core shall be no greater than 0.3mA.

4.2 Winding insulation resistance

The insulation resistance between the winding and the shell of the ABS solenoid modulator for pneumatic shall be no less than 20 Mohm.

4.3 Winding temperature rise

The temperature rise of the winding of the ABS solenoid modulator for pneumatic at room temperature shall be no higher than 20°C; and the temperature rise at high temperature shall be no higher than 15°C.

4.4 Air tightness

The air tightness of the sample under various working conditions shall meet the requirements of Table 1.

4.5 Residual pressure

The residual pressure of the sample at room temperature and low temperature shall meet the requirements of Table 2.

4.6 Pressure resistance

During the test, the sample shall have no external leakage and damage; after the end of the test, the air tightness of the sample at room temperature, the state of pressure-raising, the state of pressure-retaining and the state of pressure decompressing shall meet the requirements of the corresponding states in Table 1, respectively.

6.2 Winding insulation resistance

6.2.1 The test shall be conducted at an ambient temperature of 18°C~28°C and a relative humidity of 45%~75%.

6.2.2 Measure the insulation resistance between the winding coil and the shell of the ABS solenoid modulator for pneumatic.

6.3 Winding temperature rise

6.3.1 Temperature rise at normal temperature

6.3.1.1 The ambient temperature during the test is 18°C~28°C; and the sample shall be placed at this ambient temperature for at least 6h.

6.3.1.2 A DC voltage of (117.5 ± 2.5) % Ve is applied to the winding coil of the ABS solenoid modulator for pneumatic. The voltage is cut off after 30s; and the maximum temperature rise on the outer surface of the winding is measured at the same time.

6.3.2 Temperature rise at high temperature

Except that the test ambient temperature is (80 ± 2) °C, the rest is the same as 6.3.1.

6.4 Air tightness

The test methods and conditions of the samples under various working conditions are shown in Table 7. When conducting air tightness tests under high and low temperature conditions, the heat preservation shall be carried out at test environment temperature for at least 6 h.

6.6

6.6.3 During the test, pay attention to whether the sample has external leakage or damage.

6.6.4 After the end of the test, measure the air tightness in the state of pressure boosting, state of pressure retaining, and state of pressure decompressing at room temperature according to Table 7.

6.7 Response characteristics

6.7.1 Connect the sample according to Figure 1; and connect the sample to the relevant control signal lines of the simulation controller or the real vehicle controller.

6.7.2 Input Pe (or the air pressure agreed by the supplier and the purchaser) compressed air from the air inlet of the sample.

6.7.3 Operate the controller to make the ABS solenoid modulator for pneumatic work in the mode of "pressure decompressing (time is 500 ms) -> pressure retaining (time is 100 ms) -> pressure boosting (time is 500 ms)"; and operate it 5 times in total. Record the relationship curve between the outlet pressure and time history of the sample during the last operation, see Figure 3.

6.7.4 After the end of the test, as per the requirements of Figure 3, determine the time of pressure boosting, time of pressure decompressing, lag time of pressure boosting, lag time of pressure decompressing, as well as the pressure boosting rate of the sample outlet pressure in the rising range of 0.20 MPa~0.50 MPa (take the time corresponding to the air pressure points of 0.20 MPa and 0.50 MPa, and calculate the slope of the two points), and the pressure decompressing rate in the falling range of 0.50 MPa~0.20 MPa (take the time corresponding to the air pressure points of 0.50 MPa and 0.20 MPa, and calculate the slope of the two points) from the measurement curve. […]