Research on Energy Management Strategy for Plug-in Hybrid Electric Vehicle

Energy management strategy is one of the key technologies of plug-in hybrid electric vehicle (PHEV).Selecting a reasonable and efficient energy management strategy can improve the fuel economy of PHEV.Since the regular CD-CS strategy causes a rapid increase in fuel consumption when entering the charge sustain mode.Therefore, this paper proposes the equivalent fuel consumption minimization strategy (ECMS) to improve the fuel economy of PHEV.The approximate optimal equivalent factor is selected by off-line iteration to keep the vehicle in the charge depleting mode as much as possible.Finally, the simulation results show that the ECMS strategy improves the fuel economy by 16.51% compared with the CD-CS strategy.The validity of ECMS strategy is verified.