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

摘要： 在 P2 混动系统中，发动机启动时存在整车平顺性及起动机寿命问题，为此展开了 P2 混合动力汽车启动过程控制策略的课题研究，其原则是保证整车平顺性的同时兼顾起动机寿 命，为解决上述问题，在动力需求较大或者发动机启动系统出现故障时的非常规工况，通过 起动机启动发动机；在常规工况将整车控制器（VCU）与变速箱控制器（TCU）技术融合， 提出了一种在换挡过程中启动发动机的新策略，当 TCU 接收到 VCU 发送的发动机启动请求， TCU 基于换挡流程执行启动发动机的请求。最后基于该策略通过 Simulink 建模生成代码刷写 到整车控制器里面进行实车测试验证。上述策略试验结果表明，整个发动机启动过程不仅无 明显动力中断，而且驾驶平顺性较好。该策略目前在量产车型上大量使用，这对发动机启动 技术的研究具有一定的工程价值。

关键词: P2 混动；控制策略；发动机启动；Simulink