为了改善纯电动汽车驱动系统的性能,开发一种用于纯电动运动多功能汽车的两级自动变速器。应用速比选择原则、换挡控制策略,研究其对于整车性能的影响。仿真结果表明:设计的两挡自动变速器可降低对电机最大转矩和最高转速的需求,减少机械传动噪音,降低变速器输入转速,优化电机的工作转速区间,提高动力传动系统效率。台架试验表明:采用电机主动同步控制技术,在挡位切换过程中能减少动力中断时间,获得较好的换挡品质。 In order to improve the performance of a pure electric vehicle drive system, a two-stage automatic transmission for a purely electric sports multi-purpose vehicle is developed. The principle of speed ratio selection and shift control strategy are applied to study the impact on vehicle performance. The simulation results show that the designed two-speed automatic transmission can reduce the maximum torque and maximum speed of the motor, reduce the mechanical transmission noise, reduce the input speed of the transmission, optimize the operating speed range of the motor and improve the efficiency of the powertrain. The bench test shows that the active synchronous control technology of the motor can reduce the power interruption time during gear shift and obtain better gear shift quality.