System integration and power flow management for the engine-generator operation of a range-extended electric vehicle

This paper introduced a new power flow control strategy for a variable speed engine-generator based range-extended electric vehicle. The specific fuel consumption map of the internal combustion engine (ICE) has been obtained by off-line experiments to achieve optimal fuel efficiency. Finally, a typical range-extended electric vehicle is modeled and investigated such as acceleration traversing ramp, maximum speed and fuel consumption are performed on the dynamic model of a range-extended electric vehicle. The goal of this paper was to obtain a complete and optimum control structure for the studied range extended electric vehicle. Numerical models of battery and transmission were established. In order to check the model and control of the studied system, a simple strategy is taken into account and discussed the programs were written base on these theories. At the end of this paper, simulation results were analyzed, and it has been proved that range-extended electric vehicle can avoid deep discharge cycles. Therefore, range extended electric vehicle battery cycle life definitely greater than EV battery cycle life. It's also meaning that battery operating cost of range extended electric vehicle being much lower than EV.