伴随发动机起动的混合动力汽车切换协调控制

Switch Coordination Control of Hybrid Electric Vehicle with Engine Starting

并联式混合动力汽车在伴随发动机起动过程中,由于离合器的动作复杂,在模式切换时极易产生转矩的巨大波动,为此,本文提出了一种动态协调控制方法。通过对切换过程的动力学分析,依据发动机、电机和离合器等所处状态不同,将切换过程分为发动机起动、转速同步和转矩突变3个阶段。综合考虑到各阶段控制目标的不同,分别设计了基于开关控制的发动机起动、基于模型预测控制的转速同步和基于电机补偿发动机转矩突变的动态协调控制策略。利用MATLAB/Simulink软件和搭建的试验平台,对3种动态协调控制方法分别进行了仿真和试验验证。研究结果表明:采用协调控制策略后,整车冲击度降低了68%,有效改善了驾驶舒适性。

Due to the complex action of clutch in the process of parallel hybrid electric vehicle( PHEV) with engine starting,huge torque fluctuation was produced easily beause of mode switching.A dynamic coordinated control method was proposed.After analyzing the dynamics of the switching process,according to the different states of engine,motor and clutch,etc.,the switching process was divided into three stages of the enginestarting,the speed-synchronizing and the torque-changing. Considering the different control objectives of each stage,the dynamic coordinated control algorithms based on bang-bang engine starting control,model predictive speed synchronous control and motor compensation engine torque mutation control were designed respectively.The three dynamic coordinated control methods were simulated and verified by MATLAB/Simulink software and the experimental platform. The results show that the vehicle impact is reduced by 68% and the driving comfort is improved effectively.