关键词: P2 混动；控制策略；发动机启动；Simulink

Abstract: In the P2 hybrid system, challenges related to vehicle ride comfort and starter motor durability arise during engine startup. To achieve this objective, a research project is conducted focusing on the control strategy for the starting process of P2 hybrid vehicles. The underlying principle is to ensure the smooth operation of the entire vehicle while also considering the longevity of the starter. To address these issues, in unconventional operating conditions where the power demand is high or the engine starting system malfunctions, the engine is started by the starter. Under normal operating conditions, a novel strategy has been proposed. This strategy involves starting the engine while shifting gears, which is achieved through the integration of vehicle control unit (VCU) and transmission control unit (TCU) technologies. When the TCU receives the engine start request from the VCU, it executes this request in accordance with the shift process. Ultimately, based on this strategy, it generates code through Simulink modeling and uploads it to the vehicle controller for real-world testing and verification. Experimental results demonstrate the entire engine starting process not only prevents noticeable power interruption but also ensures satisfactory driving smoothness. Since its introduction, this strategy has been widely adopted in mass produced vehicle models, this holds significant engineering value for research in engine starting technology.

Key words: P2 hybrid; control strategy; engine start; Simulink