中文摘要：

为了提高纯电动汽车动力系统的工作效率,提出了一种基于电机辅助的纯电动汽车模式切换控制策略;首先,在传统纯电动汽车结构基础上配置一个小功率电机,得到一种双电机型纯电动汽车;其次,在双电机型纯电动汽车各驱动和各再生制动模式下,对其动力系统进行动力学分析和能量平衡分析,得出了系统在各模式下的工作效率模型;然后,以使动力系统工作效率最大为原则,制定了模式切换控制策略,确定了车辆的目标运行模式和两电机的目标转矩;最后,在Advisor仿真平台CYC_ NEDC循环工况下,对该模式切换控制策略进行仿真,结果表明,与传统纯电动汽车相比,该控制策略使动力系统的工作效率提高了约6％.

英文摘要：

In order to improve the efficiency of the power system in electric vehicles, a mode switching control strategy of electric vehi- cles assisted with electric machine is presented. First, a dual--motor--type electric vehicle was obtained, which was amounted with a low--power motor on the the original structure of a traditional electric vehicle; Secondly, the dynamic analysis and the energy--balance analysis of its power system were completed, and then its efficiency at each mode was represented; Then, to make the efficiency of the power system maximum , a mode switching control strategy was formulated, which determined the target mode target of the vehicle and target torque of the two motors; Finally, in Advisor simulation platform CYC_ NEDC cycle condition, the mode switching control strategy was simulated, and simulation results showed that, compared with conventional electric cars, this control strategy made the working efficiency of the power system increased by about 6%.