CVT插电式混合动力汽车经济性控制策略

Economic Control Strategy for a Plug-in Hybrid Electric Vehicle Equipped with CVT

针对搭载CVT的插电式混合动力轿车,设计了一种基于动力源外特性曲线和驾驶员踏板操作信号的需求转矩解析方法,在此基础上提出驱动和制动工况下基于瞬时经济性成本最低的能量管理策略,该策略以需求转矩、车速和电池SOC为状态变量,以发动机节气门开度、电机转矩、CVT速比为控制变量.进一步研究了电量消耗阶段有无发动机单独驱动模式对整车能耗经济性的影响.通过自行搭建的前向模型进行仿真,结果表明,电量消耗阶段无发动机单独驱动模式的控制策略具有更强的综合性经济优势.

An analytic method of demand torque was designed for a plug-in hybrid electric vehicle equipped with continuously variable transmission （CVT）, which is based on the external characteristic curve of the power source and the signal from the driver＇s operation. Then, energy management strategy minimizing instantaneous economic cost under drive and brake condition was proposed, with the demand torque, vehicle speed and state of charge （SOC） of battery as the state variables, and the throttle opening of the engine, motor torque and speed ratio of CVT as the control variables. Further research was carried out on the influence of whether the engine driving alone is allowed at the charge depleting stage on economic cost. Through simulation with self-built forward model, the results have shown that the strategy that does not allow engine driving alone at the Charge depleting stage is better in comprehensive economy.