Research on the Four-State Control Strategy Based on the Specific Condition

The Four-State control strategy based on the original CD-CS strategy has been designed by using a plug-in hybrid electric vehicle (PHEV) as the research object. The disadvantage of the CD-CS strategy is that when the driving distance is more than the maximum pure electric driving range, vehicle enters prematurely into the charge sustaining mode, resulting in the battery in a low SOC state for a long time. The software GT-drive was used to model and simulate the PHEV. The analysis results show that the Four-State control strategy is more fuel-efficient than CS-CD control strategy in the case of mileage known. The fuel consumption per 100km is reduced by 10.4% and SOC remains at high values.