一种混合动力电动汽车速比设计与优化方法

针对一种PHEV混合动力电动汽车，在动力源功率一定并且需要保证整车动力性要求的前提下，对其传动系速比进行合理的设计与优化。仿真结果表明，可以通过调整速比与电机的最大扭矩，满足车辆动力性要求，达到减小电机体积及改善整车安装性能的目的；同时还可降低离合器的滑磨功损失，提高离合器使用寿命。

A Kind of Design and Optimization of Gear Ratio for Hybrid Electric Vehicle

For a PHEV hybrid electric vehicle, we design and optimize the gear ratio reasonably when the engine power is unchanged as well as the motor power. In this way, we can guarantee the dynamic performance of the vehicle. The simulation results show that the vehicle can meet the dynamic performance requirements by adjusting the gear ratio and the maximal torque of the motor. Also we can downsize the motor volume to make the installation of the motor much more convenient. Meanwhile, the slipping frictional power of clutch can be reduced through the optimization of gear ratio so that the service life of clutch can be extended.