单轴并联式混合动力城市客车再生制动挡位决策

Gear Decision for Regenarative Brake in Single Shaft Parallel Hybrid Electric Transmitting Bus

设计一种串并混联式复合制动踏板方案,并针对该方案制订再生制动阶跃式制动力分配曲线.分析了影响再生制动效率的多种因素,提出运用序列二次规划(SQP)算法优化挡位决策和电机输出扭矩以解决再生制动中回收效率与制动力分配曲线和电机转速的矛盾.在Cruise和Matlab/Simulink联合仿真平台下,建立了单轴并联式混合动力传动系统整车模型,基于欧洲公交客车循环工况(UDC)进行了仿真研究.结果表明,电池荷电状态(SOC)比采用传统双参数换挡规律提高了近1.5%.进行了三种典型制动工况下实车试验,取得了与仿真结果相吻合的试验结果,其中正常制动工况下的能量回收率比传统双参数换挡策略提高了近11.00%.

Mathmatic model of regenerative brake for single shaft parallel hybrid electric vehicle （PHEV） was established and a series-parallel multi-brake pedal was correspondingly designed. To ensure the brake stability, a new brake torque distribution similar to the atomic transition was proposed. The factors of generator efficiency, battery charging efficiency and braking stability, which restrict the increase in regenerative efficiency, were analyzed and the sequential quadratic programming（SQP） algorithm was used to optimize the gear decision and regenerative brake torque ouput. The model of hybrid propulsion system has been built under the Cruise and Matlab/Simulink joint simulation platforms. According to the rule of UDC drive cycle simulation, the experimental data indicate that, compared with traditional dual parameters shift decision, the final state of charge （SOC） could be increased by 1.5% and the regenerative efficiency be 11.00~ more than that in the normal brake pattern. Three typical cycle road tests have been implemented and the results well fit in with the simulation ones.