分布式驱动电动车电机失效后行驶稳定性研究

Study on Drive Stability of Distributed Drive EVs in the Motor Failure Condition

针对分布式驱动电动车电机失效后存在行车安全隐患的问题,对电机失效后行驶稳定性进行了研究,提出了一种电机失效安全控制策略以提高电机失效后的行驶稳定性。首先,介绍整车动力学模型搭建方法;其次,针对直线高速行驶时3种电机失效情况进行仿真,选取横摆角速度、质心侧偏角、侧向加速度和侧向位移作为行驶稳定性评价指标进行分析;最后,对比电机失效安全控制策略干预和不干预电机失效过程各项行驶稳定性指标。结果表明,分布式驱动电动车直线高速行驶时电机失效后行驶稳定性差。电机失效安全控制策略干预电机失效过程能够对上述4项指标进行控制,有效提高电机失效后的行驶稳定性。

Since there were potential risks of distributed drive EVs in the motor failure condition,a novel motor failure control strategy was proposed to improvethe vehicle’s stability after one of the motors fails. In this work,the method of building the vehicle dynamics model was firstly introduced. Then,three kinds of motor failure conditions in linear high-speed state were simulated,and four drive stability indicators were selected for further analysis. The vehicle stability in the motor failure condition,which is guided with or without the motor failure control strategy,has been compared with each other. The result showed that the vehicle’s stability of distributed drive EVs was poor when the motor fails at high speed range. The motor failure control strategy proposed in this paper was able to control the above four indicators effectively and improve the drive stability significantly.