CVT混合动力汽车再生制动系统仿真

Regenerative Braking Simulation for Hybrid Electric Vehicle with Continuously Variable Transmission

根据试验获取的镍氢电池快速充电特性和集成启动电机(Integrated starter/generator,ISG)发电特性,分析电动机发电效率与电池充电效率的变化规律,得到在不同输入条件下电池电动机联合效率曲线图,从而确定电池电动机联合高效优化工作线。基于此优化工作线,制定CVT速比控制策略及再生制动控制策略,并建立整车再生制动系统模型,在典型城市驱动循环工况下进行仿真分析与试验验证。结果表明,提出的基于电池电动机联合高效工作比基于电动机单独高效工作的CVT控制策略能进一步提高再生制动能量回收率。

According to the quick charging characteristic of nickel-hydrogen battery and the generating characteristic of ISG（Integrated starter/generator） motor acquired by test, the changing rules of motor generating and battery charging efficiency are analyzed, synthesis efficiency curves of battery and motor under different input condition are obtained, then a joint optimal high-efficiency working line of battery and motor is determined. Based on the optimal working line, CVT speed control strategy and regenerative braking control strategy are established, and the model of regenerative braking system of CVT hybrid electric vehicle is built, Simulation analysis and test verification are carried out under typical city driving cycles. The results show that the CVT control strategy based on the optimal working line of battery and motor can further improve the recover rate of regenerative braking energy in comparison to that based on motor working alone.