Abstract
In order to improve fuel economy further, an equivalent consumption minimization strategy (ECMS) is designed for the parallel hybrid electric vehicle (PHEV). Firstly, based on the relations among the battery state of charge (SOC) and the equivalent factor and fuel consumption, the equivalent fuel consumption minimization objective function is constructed. Secondly, a variable equivalent factor over real-time driving cycle is obtained by introducing the Pontryagin's Minimum Principle (PMP) and the penalty function of SOC. Finally, the simulation results show that compared with ECMS based on a PI controller, the ICE efficiency increases by 2% and the fuel consumption to travel 100 km decreases by 4 % with ECMS based on a variable equivalent factor.
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