T/CSAE 80-2018Endurance performance requirements and bench test methods for energy-regeneration automobile hydraulic anti-lock braking system (English PDF)

3.2 Electronic Brake Force Distribution (EBD) Electric Brakeforce Distribution

3.3 Hydraulic Control Unit (HCU) Hydraulic Control Unit

3.4 Low Pressure Accumulator LPA Low Pressure Accumulator

A storage device used in the EABS assembly to temporarily store brake fluid that is discharged by the wheel (or tends to lock).

3.5 Medium Pressure Accumulator MPA Medium Pressure Accumulator

A storage device used in the EABS assembly to temporarily store excess brake fluid due to energy recovery from the vehicle.

2T/CSAE 80 -.2018

3.6 Return Pump Return Flow Pump

The pump element used in the EABS assembly to draw the brake fluid from the LPA back to the master cylinder and pump the brake fluid from the MPA to the wheel cylinder.

3.7 Return pump motor Motor

The motor used to drive the return pump in the EABS assembly.

3.8 Inlet Valve Inlet Valve

The solenoid valve used to control the entry of brake fluid into the wheel cylinder in the EABS assembly.

3.9 Outlet Valve Outlet Valve

Solenoid valve used to control brake fluid discharge wheel cylinder in EABS assembly

3.10 Isolation valve separating valve

The solenoid valve used to control the master cylinder brake fluid into the wheel cylinder in the EABS assembly.

3.11 Switching valve

Solenoid valve used to control the master cylinder brake fluid into the medium pressure accumulator in the EABS assembly

3.12 Pressure regulating valve Release valve

The solenoid valve used to control the brake fluid of the medium pressure accumulator into the wheel cylinder in the EABS assembly.

3.13 Rated working pressure Rated Working Pressure

Working hydraulic pressure as specified in the EABS actuator assembly technical documentation.

3.14 Rated Working Voltage Rated Working Voltage

The operating voltage specified in the EABS actuator assembly technical documentation.

3.15 Boost lag time Lag time of pressure build-up

In the step-up stepping process, the lag time of the pressure signal relative to the electrical signal when the first step is boosted.

3.16 Buck time lag time Lag time of pressure decrease

In the step-down process, the lag time of the pressure signal relative to the electrical signal when the first step is stepped down.

3T/CSAE 80 -.2018

3.17 Electronic Control Unit (ECU) Electrical Control Unit

4.1 Basic requirements

The basic parameters are shown in Table 1.

Table 1 Basic parameters

Serial number item parameter value

1 Working medium DOT3 and above synthetic brake fluid

2 Working environment temperature and humidity -40 ° C ~ 120 ° C, the maximum allowable humidity of 95% 3 rated working fluid pressure 12MPa

4 Allows the use of the highest working fluid pressure of 16MPa

6.1 Sealing test

The sealing requirements are to be carried out in accordance with 6.1 of T/CSAE 79-2018.

6.2 EABS dynamic performance test

The dynamic performance test is performed as required by 6.2 of T/CSAE 79-2018.

5T/CSAE 80 -.2018

6.3 Working noise test

6.3.1.1 Simulating the actual vehicle state installation sample (with mounting bracket and damping pad), control circuit and analog controller or real vehicle controller Connected; installed in the noise detection station.

6.3.1.2 Operation controller, simulating the boosting, holding pressure and depressurization process of conventional braking, the test pressure is (12±0.5) MPa;

Record the working noise of the sample.

6.4 Durability test

6.4.1 Endurance test composition

Simulate the actual vehicle state to install the sample, and the control circuit of the sample is connected to the analog controller or the real vehicle controller. Work durability test the EABS brake consists of six parts, and its cyclic composition is shown in Table 3.

Table 3 Durability test cycle composition relationship

Temperature (°C)

ABS

Loop I

ABS

Cycle II

EBD

Feedback brake

Loop I

Feedback brake

Cycle II

Loop order

23±5 96000 750 1250 6000 192000 192000 96N-2ABS-6EBD-3840R 100±4 24000 750 1250 6000 64000 64000 24N-2ABS-6EBD-128R 120±4 8000 0 0 0 0 0 8N-0ABS-0EBD-0R-30±2 24000 250 750 3000 64000 64000 24N-1ABS-3EBD-128R-40±2 8000 0 0 0 0 0 8N-0ABS-0EBD-0R 160000 1750 3250 15000 320000 320000 820000 Note. N is the normal brake, R is the feedback brake (cycle I. 3MPa, cycle II. 8MPa), ABS is the ABS intervention work (cycle I. 12MPa, Cycle II. 6MPa), EBD is the EBD intervention work (example. 30N-2ABS-6EBD-60R means 30 regular brakes in a single cycle, 2 times ABS intervenes in working brakes, 6 EBD brakes and 60 feedback brakes. )

6.4.2 Conventional brake pressure ratio

The normal brake pressure ratio is shown in Table 4, for example.

Table 4 Durability energy test composition ratio of conventional brake pressure

Brake pressure 23±5°C 100±4°C 120±4°C -30±2°C -40±2°C Total 12MPa 9600 2400 800 2400 800 16000 9MPa 28800 7200 2400 7200 2400 48000 5MPa 57600 14400 4800 14400 4800 96000 6T/CSAE 80 -.2018

6.4.3 ABS test cycle

6.4.3.1 The ABS test cycle is shown in Figure 1.

6.4.3.2 Cycle I. The boost time is 5ms in a single cycle, the pressurization pressure time is 60ms, and the buck time is (15±5)ms.

The pressure is reduced by 10ms. The number of steps in a single stage is increased from 4 to 7. The pressure control interval is (7 ~ 10.5) MPa, about repeat adjustment 24 the single cycle control time is (10 ± 0.5) s. (Control time error should be no more than 2%, the same below)

6.4.3.3 Cycle II. The single cycle is divided into two phases. In the first phase, the step pressure is 10ms, and the boost pressure is 60ms, the step-down time is (15±5)ms, and the step-down pressure is 10ms. The second stage pressurization time is 5ms, and the pressure holding time is 60ms.

The step-down time is (15 ± 5) ms, and the step-down pressure is 10 ms. The number of steps in a single stage is increased from 4 to 7.

6.4.3.4 The two-stage pressure control interval is 3 to 5 MPa, and the two phases are repeated 13 times in sequence, and the total cycle control time is the interval is (10 ± 0.5) s.

6.4.4 EBD Endurance Test Method

The EBD endurance test is performed as shown in Figure 2. In the EBD test cycle, the oil pressure source pressure is 9 MPa, and the initial pressure of the rear wheel pressure is.

6MPa. The buck time is 7ms, the boost time is 20ms, and the hold time is 1 s. The EBD control time is 3s. (Control time Inter-error should be no more than 2%)

6.4.5 Feedback brake test method

6.4.5.1 Cycle I. The pressure of the oil pressure source is (3±0.5) MPa. After 0.5 s, the isolation valve is energized, and the switching valve is energized until the end of the cycle;

After 3.5s, the motor and the pressure regulating valve are energized. After 1s of operation, the cycle ends and all solenoid valves and motors are de-energized. (Control time error should not More than 2%, the same below)

6.4.5.2 Cycle II. The pressure of the oil pressure source is (8±0.5) MPa. After 0.5 s, the isolation valve is energized, and the switching valve is energized until the end of the cycle;

Figure 1 ABS cycle test method

(MPa)

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 (S) Cycle II Loop I 7T/CSAE 80 -.2018 After 1.5s, the motor and the pressure regulating valve are energized. After 1s of operation, the cycle 2 ends and all solenoid valves and motors are de-energized.

6.4.5.3 The feedback brake cycle I and cycle II execution ratio is 50/50.

Figure 2 EBD test method

(MPa)

0 0.4 1.4 2.4 3.4 (S)