中文摘要：

提出插电式混合动力汽车自动变速器的换挡规律设计方法，以及发动机和电动机之间的转矩分配策略。该策略通过对变速器挡位、发动机输出转矩和电动机输出转矩的调节，可使发动机沿着最佳燃油经济性曲线运行、电动机工作于高效率区，并且确保蓄电池组的充放电电流限制在额定容量的两倍以内：实现自动变速器、发动机、电动机和电池的集成最优控制。利用仿真分析方法，对控制策略的性能进行仿真测试，测试结果表明该方法可使每个部件均工作于理想状态，提高车辆在城市工况行驶时的燃油经济性。

英文摘要：

Abstract： A shift schedule for automatic transmission of the plug-in hybrid electric vehicle（PHEV）, and a torque distribution strategy between engine and motor are devised. By adjusting the gear of the automatic transmission and the output torque of the engine and motor, the control strategy allows the engine run along the best fuel economy curve, electric motors work in the high efficiency area, and ensure the charge or discharge current of the battery are less than twice the rated capacity. Therefore, the integrated optimal control for automatic transmission, engine, motor and battery is realized. The performance of the control strategy is tested by the PHEV simulation model, the simulation results show that this method guarantees each component can work in the optimal state and can improve the fuel economy when PHEV drove in the city cycle.