关键词: 混合动力汽车；能量回收；模式切换；调速发电；整车平顺性

Abstract: When the charging capacity of the power battery of the hybrid electric vehicle is low, the charging capacity of the battery cannot take into account the mode switching speed regulation power generation and energy recovery power generation, and the mode switching during the coasting energy recovery process will cause the vehicle irregularity. To solve this problem, a mode switching control strategy for energy recovery process of hybrid electric vehicle is proposed. According to the real-time information of the vehicle, the mode switching type and the state of energy recovery are identified. The mode switching type is series switching parallel and the vehicle is in the state of energy recovery. By reducing the engine torque to the oil cut-off torque and the speed regulation time of mode switching is extended to reduce the power generation of the generator during the speed regulation process. The results of vehicle calibration test show that the mode switching control method in this study can ensure that the wheel end can recover according to the target recovery torque, and significantly improve the vehicle ride comfort of mode switching during the coasting energy recovery process.

Key words: Hybrid electric vehicle; Energy recovery; Mode switching; Speed regulation power generation; Vehicle ride comfort