某型混合动力汽车协调换挡控制策略的研究

A Study on the Coordinated Shift Control Strategy for a Hybrid Electric Vehicle

本文针对一款装有机械式自动变速器和后驱电机的混合动力汽车开发了协调换挡控制策略,对车辆冲击和离合器摩擦损失进行优化。控制策略将换挡过程分为发动机主动调速、离合器接合和恢复并联驱动3个阶段。采用模糊PID控制器和模糊控制器分别进行发动机转速调节和离合器接合速度调节,并用电机对动力系统转矩波动进行补偿。仿真和台架试验结果,采用虽然该协调控制策略虽然换挡时间相对延长,但能同时减小车辆冲击和离合器摩擦损失,将冲击度控制在±4 m/s^3范围内,并只产生很小的离合器摩擦损失,汽车的换挡品质得到明显改善。

A coordinated gear shifting control strategy for a hybrid electric vehicle equipped with automated mechanical transmission and a rear drive motor is developed to optimize vehicle jerk and clutch friction loss.With the control strategy,the shifting process is divided into engine speed active regulation,clutch engagement and engine speed recovery three phases.Fuzzy PID and fuzzy controllers are adopted to regulate engine speed and clutch engaging speed respectively with the torque fluctuation of powertrain compensated by electric motor.Simulation and bench test results indicate that the adoption of coordinated control strategy,though relatively extending shift time,can concurrently reduce the vehicle jerk and clutch friction loss,with a shift jerk limited within ±4 m/s^3 and only a little clutch friction loss,apparently improving the shift quality of vehicle.