混合动力汽车转矩分配策略优化研究

摘要

以搭载改型后的Atkinson循环发动机并带有双离合器的单轴并联式混合动力三厢轿车为研究对象,采用逻辑门限值控制方法对发动机和电机的转矩进行合理分配,使混合动力系统在各种行驶工况模式下能够实时切换到高效工作区;引入各个驾驶工况模式控制策略的瞬时优化算法,进一步提高混合动力总成系统的整体效率.仿真和试验对比分析表明,提出的控制策略能够有效地降低NEDC循环工况百公里油耗,提高了搭载Atkinson循环发动机混合动力汽车的燃油经济性.%Taking a novel parallel hybrid sedan with dual clutch equipped with a retrofit Atkinson cycle engine as the research object,the logic threshold control method of distributing the torque of the engine and electrical machine reasonably was adopted so as to switch to the high efficiency working area in a variety of driving modes in time.The instantaneous optimization algorithm of various driving conditions was introduced to elevate the overall efficiency of hybrid system.The simulation results and comparative analysis show that the proposed optimization control strategy can effectively reduce the fuel consumption per 100 kilometers of NEDC cycle and hence improve fuel economy of vehicle carrying Atkinson cycle engine.