基于系统效率最优的新型混合动力汽车控制策略

Control strategy for novel hybrid electric vehicle based on system efficiency optimization

为了充分发挥混合动力汽车节省燃油和降低排放的控制效果,研究了一种基于行星齿轮机构的新型混合动力汽车动力传动系统方案.在对其驱动系统关键零部件性能实验与数值建模的基础上,综合考虑发动机、ISG电机和动力电池组以及传动系统效率,分析了系统相关典型工作模式下的纵向动力学方程,推导出系统效率模型,提出了基于系统效率最优的全工况整车控制策略,制定了整车的工作模式切换规则与换档控制策略.在MATLAB/Simulink环境下,建立了整车性能仿真模型,结果表明,采用该控制策略能使整车动力性与燃油经济性较传统车明显提高,最后通过台架试验对该方案进行了验证.

In order to fully exert the control effect in electric vehicle, a scheme for the power transmission both saving fuel and reducing emission for hybrid system of novel hybrid electric vehicle based on planetary gear mechanism was studied. Based on the performance testing and numerical modeling for the key parts of driving system, the efficiency of engine, ISG motor, power battery pack and transmission system was comprehensively considered. The lognitudinal dynamic equations of the system in the typical operating modes were analyzed, and the models for system efficiency were derived. The control strategy for whole vehicle based on system efficiency optimization under all operating conditions was proposed. The switching rule of operating modes and the control strategy of gear shift for whole vehicle were determined. In the MATLAB/Simulink environment, the simulation model for the performance of whole vehicle was established. The results show that with the proposed control strategy, the power performance and fuel economy of whole vehicle get enhanced obviously compared with the traditional vehicles. Finally, the proposed scheme is verified with the bench tests.