ISG混合动力电动汽车的转矩控制策略

Torque Control Strategy for ISG Hybrid Electric Vehicles

转矩为ISG混合动力电动汽车能量管理策略中最主要的控制变量,其实质为转矩分配策略。针对ISG并联混合动力轿车,根据混合动力系统的工作模式,以需求转矩与发动机当前最佳效率转矩的比值和蓄电池荷电状态(SOC)为输入,以电机转矩指令为输出,构建了转矩分配模糊控制器。基于仿真软件ADVISOR,选用NEDC道路循环工况进行了仿真分析。结果表明:与传统门限控制策略相比,该模糊控制器在一定程度上更有效地降低了混合动力电动汽车的燃油消耗量,并且保持电池组SOC在工作区间的平衡。

The torque becomes the most important controllable factor for an ISG（ integrated starter/generator）parallel hybrid electric vehicle of energy management strategy. Therefore,energy manage-ment must consider how to employ a torque approach. For the ISG HEV,based upon the operating modes of the hybrid power train,a fuzzy inference engine of a torque distribution controller is con-structed by using the ratio of the driver required torque to the current optimal torque of engine and the battery state-of-charge（ SOC）as the inputs,and the motor torque instructions as the output. The dy-namic performance,fuel economy and battery state of charge（ SOC）are simulated in the NEDC typi-cal driving cycle by vehicle simulation software ADVISOR. The simulation results indicate that,com-pared with the strategy which uses threshold parameters,the proposed strategy both improves fuel e-conomy of the vehicle and maintains SOC of the battery within its operation range more effectively in a extent.