T/CSAE 77-2018 in English
VALIDTest methods for constancy of braking efficiency of regenerative braking system for electric vehicles
- Issued on:2018-09-03
- Implemented on:-
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
| Standard No: | T/CSAE 77-2018 |
| Document status: | VALID |
| Title in English: | Test methods for constancy of braking efficiency of regenerative braking system for electric vehicles |
| Title in Chinese: | 电动汽车再生制动系统制动效能 恒定性试验方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2018-09-03 |
| Professional Classification: | T/-Social Organization Standard |
| Related Keywords: | test type test conditions implementation
standard test electric brake system efficiency test test methods test method |
| Related Topics: | efficacy
Braking System Braking System GBT 3269 Commercial vehicle retarder braking system performance test method t/csae 312 Car brake test related t/csae 133 Experimental methods for electric vehicle dynamics |
Introduction
Analysis of the core content of the standard
This standard specifies the test method for the braking performance constancy of the regenerative braking system of electric vehicles under three typical working conditions:
| Test type | Test conditions | Implementation standard |
|---|---|---|
| Test at different initial velocities | 80% maximum vehicle speed/80km/h/32km/h | GB 21670(Passenger cars) GB 12676(Commercial vehicles) |
| Test at different states of charge | SOC>95%/ 1/3 driving range/ 2/3 driving range | QC/T 1089 |
Key technical indicators
Average deceleration variation coefficientCalculation formula:
v = σ/ā ×100%
Where σ is the standard deviation of 5 tests, ā is the average of 3 groups of tests. This coefficient directly reflects the stability of braking performance.
Key points of test implementation
- Environmental control: temperature 5-32℃, brake initial temperature 65-100℃
- Data acquisition: vehicle speed measurement accuracy ±1%, deceleration calculation error ≤3%
- Repetition requirements: at least 5 valid tests for each working condition
Background of standard evolution
This standard was first formulated in 2018, mainly to solve the problem of coordinated control of the regenerative braking system unique to electric vehicles and traditional friction brakes. Compared with traditional standards such as GB 21670, the following are newly added:
- Requirements for monitoring the status of the electric brake system
- Efficiency test under different SOC states
- Energy recovery and braking stability collaborative evaluation
Implementation suggestions
Passenger car test case: When the maximum speed of a certain model is 120km/h, the three initial speeds of 96km/h, 80km/h and 32km/h should be selected, and 5 tests should be carried out at three pedal openings of 30%/50%/80%, and the braking distance and deceleration changes should be recorded.
Commercial vehicle precautions: Special attention should be paid to the special requirements for pneumatic brakes in GB 12676. It is recommended to complete the specified number of running-in brakes before testing.
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