并联混合动力汽车的模糊转矩控制策略

提出了一种新的并联混合动力汽车(PHEV)模糊转矩控制策略(FTCS)及其设计方法.以并联混合动力系统的工作模式为基础,利用请求转矩与发动机最佳转矩的比值和电池电荷状态(SOC)为输入、电机归一化转矩指令为输出,构建了有22条规则的模糊推理器,用以确定发动机和电机的最佳转矩分配,实现系统的总体能量转换效率最高.仿真结果表明,与采用精确门限参数的策略相比,FTCS的燃油经济性有较大提高,并能更好地控制电池SOC在工作区变化.

The Fuzzy Torque Control Strategy for Parallel Hybrid Electric Vehicles

A novel fuzzy torque control strategy(FTCS) for parallel hybrid electric vehicles(PHEV) and its design method were presented.Based upon the operating modes of the hybrid powertrain,a fuzzy inference engine with 22 rules is constructed using the ratio of the driver torque request to the optimal engine torque and the battery state-of-charge(SOC) as the inputs,and the normalized electric machine(EM) torque as the output.It works as the kernel of a fuzzy torque distribution controller to determine the optimal distribution of the driver torque request between the engine and the EM to optimize the overall energy conversion efficiency of the PHEV.The simulation results reveal that,compared with the conventional strategy which uses precise threshold parameters,the proposed FTCS improves fuel economy and maintains battery SOC within its operation range more effectively.