滑行过程中的电机控制对电动汽车行驶阻力的影响分析

The Impact Analysis of Driving Resistance for Electric Vehicles Based on Motor Control in the Coast down Test

针对某款纯电动轿车进行整车阻力试验分析与研究,在整车阻力分解阶段提出在原有电机控制策略的基础上进行"电机零转矩指令下偏正向转矩标定优化"的控制策略,并对体现优化策略的实车进行阻力复测研究。研究结果表明,优化后的策略对降低整车行驶阻力有明显的改善,整车道路行驶阻力平均值降低33 N。运用此策略在进行道路行驶阻力测试时满足相应的国标测试规范,对新标欧洲循环测试(New European Driving Cycle,NEDC)下的续驶里程提升也有显著贡献。

The resistance of a pure electric vehicle was measured and analyzed. In the stage of resistance decomposition,an optimization strategy for the zero torque request of the motor was put forward based on the original strategy. Then,the new strategy was implemented in the resistance test. The results show that the optimized strategy leads to an obvious improvement in driving resistance. The average driving resistance was reduced by 33 N. This strategy conforms to the national standard specifications of the road driving resistance test,and also contributes significantly to the increase in driving range under NEDC.