Design and Strategy of Series-Parallel Hybrid System Based on BSFC

In this paper, a drive control strategy is developed based on the characteristics of series-parallel plug-in hybrid system. Energy management strategies in various modes are established with the basis on the minimum brake specific fuel consumption (BSFC) curve of engine. The control strategy, which is based on rules and system efficiency, is adopted to determine the entry/exit mechanisms of various modes according to battery state of charge (SOC), required power and required speed. The vehicle test results verify that the proposed control strategy can improve vehicle economy efficiently and makes a good effect on engine control.