Research on Operation Mode and Control Strategy of Plug-in Hybrid Powertrain System

Abstract

As the advantage of good fuel efficiency, simple structure and easy modularization, the single motor P2 hybrid powertrain has been widely used by major automobile manufacturers. However, because the hybrid system has only one motor, the control strategy in the vehicle operating process is complex, which is also recognized as a difficult point in the industry. Based on a P2 plug-in hybrid car, the configuration, operation mode and control strategy of the hybrid powertrain are discussed in detail. The important module of the P2 hybrid powertrain configuration is CCM (Clutch Coupling with Motor) module, engine engages or disengages the DCT (Dual Clutch Transmission) by the clutch, with help of the configuration, there are six operation modes were carried out, such as engine idle stop, pure electric drive, engine drive & charging battery, only engine drive, boost, and regenerative break. At the same time, the two kinds of powertrain system (AER (All Electric Range) and Blended) were discussed for PHEV (Plug-in Hybrid Electric Vehicle), according to requirement, the AER powertrain system was adopted in this paper. Based on NEDC driving cycle, the control strategy was studied, also the operation mode and performance of PHEV car were verified, from the results, the expected development goal was achieved.