T/CSAE 82-2018Endurance performance requirements and bench test methods for energy- regeneration automobile electronic stability control system (English PDF)

3.2 Electronic Braking Force Distribution EBD Electric Brakeforce Distribution

During the braking process, by adjusting the braking force of the rear wheel, the braking force distribution of the whole vehicle tends to be idealized.

3.3 Hydraulic Control Unit HCU Hydraulic Control Unit

Mechanical hydraulic actuator of the energy feedback type vehicle dynamics control system.

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3.4 Low Pressure Accumulator LPA Low Pressure Accumulator

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

3.5 Return Pump Return Flow Pump

The pump element used in the EESC 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.

3.6 Return pump motor Motor

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

3.7 Inlet Valve Inlet Valve

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

3.8 Outlet Valve Outlet Valve

The solenoid valve used to control the brake fluid discharge wheel cylinder in the EESC assembly.

3.9 Isolation valve Separating valve

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

3.10 Switching Valve Switching valve

The solenoid valve used to control the master cylinder brake fluid into the pedal simulator in the EESC assembly.

3.11 Fuel Supply Valves Supplying valve

A solenoid valve used to control the opening and closing of the second circuit in the EESC assembly.

3.12 Rated working pressure Rated Working Pressure

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

3.13 Rated Working Voltage Rated Working Voltage

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

3.14 ECU Electrical Control Unit

Electronic control unit.

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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 EESC Dynamic Performance Test

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

6.3 Working noise test

6.3.1 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.

6.3.2 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.

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6.4 Durability test method

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. EESC brake durability the test consists of six parts, and the cyclic composition relationship 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

235 96000 750 1250 6000 192000 192000 96N-2ABS-6EBD-3840R 1004 24000 750 1250 6000 64000 64000 24N-2ABS-6EBD-128R 1204 8000 0 0 0 0 0 8N-0ABS-0EBD-0R-302 24000 250 750 3000 64000 64000 24N-1ABS-3EBD-128R-402 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 composition

The conventional brake pressure is shown in Table 4.

Table 4 Durability energy test composition ratio of conventional brake pressure

Brake pressure

(MPa)

Temperature (°C)

total

23±5 100±4 120±4 -30±2 -40±2 12 9600 2400 800 2400 800 16000 9 28800 7200 2400 7200 2400 48000 5 57600 14400 4800 14400 4800 96000

6.4.3 ABS cycle mode

6.4.3.1 ABS cycle mode is shown in Figure 1.

6.4.3.2 Cycle I. The boost time is 10ms in a single cycle, the pressure hold time is 60ms, and the buck time is 15±5ms.

The pressure is maintained for 10ms. The number of steps in a single stage is increased by (4 to 7). The pressure control interval is (7 ~ 10.5) MPa, about 24 adjustments.

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Figure 2 EBD test method

(MPa)

0 0.4 1.4 2.4 3.4 (S) the single cycle control time is (10 ± 0.5) s.

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 buck time is 15±5ms, and the buck pressure is 10ms. The second stage pressurization time is 5ms, and the pressure holding time is 60ms.

The pressing time is (15±5) ms, and the pressure is reduced by 10 ms. The number of steps in a single stage is increased from 4 to 7. The two-stage pressure control interval is (3 ~ 5) MPa, about two stages are repeated 13 times in sequence, and the total time of single cycle control is (10 ± 0.5) s.

6.4.4 EBD cycle mode

The EBD test cycle is shown in Figure 2. The oil pressure source is 9 MPa and the rear wheel pressure is 6 MPa. The buck time is 7ms.

Figure 1 ABS cycle mode

(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 82 -.2018 the pressurization time is 20ms, and the holding time is 1 s. The EBD control time is 3s.

6.4.5 Feedback brake test method

6.4.5.1 EBD test method Cycle 1. The pressure of the oil pressure source is (3±0.5) MPa. After 50ms, the first isolation valve and the switching valve are energized.

Two oil supply valves and motors are energized for 5s, the fuel supply valve and the motor are powered up for 0.6s, and the front wheel outlet valve is energized for 4.4s; then all the solenoid valves and the motor is powered off. The loop ends.

6.4.5.2 Cycle 2. The pressure of the oil pressure source is (80.5) MPa. After 50ms, the first isolation valve and the switching valve are energized, and the two oil supply valves and electricity are supplied.

The machine is powered on for 3 s. After the fuel supply valve and motor are powered up for 1 s, the front wheel outlet valve is energized for 2 s, and then all valves and motors are de-energized. The end of cycle two ends.

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