T/CSAE 76-2018 in English
VALIDRapid evaluation and test methods for energy recovery effectiveness ofregenerative braking for battery electric vehicles
- Issued on:2018-09-03
- Implemented on:2018-09-03
- File Format:PDF
- Delivery:Via email within 5 business days
$388.00
Introduction
Standard Core Values and Technical Framework
This standard establishes for the first time a quantitative evaluation system for the regenerative braking system of pure electric vehicles, and achieves rapid evaluation of energy recovery efficiency through two methods: chassis dynamometer and road tests. The technical framework includes three major modules:
| Evaluation dimensions | Test methods | Core indicators |
|---|---|---|
| Energy conversion efficiency | Cyclic operating condition test | Braking energy recovery efficiency (η) |
| Economic contribution | Multi-cycle test | Energy economy contribution rate (ξ) |
| System stability | Tolerance verification | Speed/time deviation threshold |
Analysis of key technical parameters
1. Energy recovery efficiency calculation model
The standard adopts a double verification mechanism: $$η=\frac{\sum E_{recovered}}{\sum E_{recyclable}}×100\%$$ The calculation of recoverable energy needs to consider the slip coefficient(A/B/C) and the rotational mass conversion factor, typical value range:
- Rotational mass coefficient of passenger car: 1.03-1.05
- Slip coefficient A in urban conditions: 0.003-0.008 N/(km/h)²
2. Test equipment accuracy requirements
| Parameter | Accuracy | Resolution |
|---|---|---|
| Voltage | ±0.1% FS | 0.1V |
| Current | ±0.1% FS | 0.1A |
| Vehicle speed | ±1% | 0.2km/h |
Implementation suggestions and industry impact
According to the measured data of 5 mainstream automakers, the optimized regenerative braking system can achieve:
- Energy recovery efficiency under NEDC conditions is improved by 15-25%
- Cruise range is increased by 8-12%
It is recommended that companies focus on the following when implementing:
- Give priority to the use of four-wheel drive chassis dynamometer for system verification
- Strictly control the state of charge (SOC) in the range of 40-60%
- Use the Chinese operating conditions (CLTC-P) as a supplementary test cycle
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