An energy management strategy for a CVT based parallel hybrid electric vehicle

In this paper, an energy management strategy with a real time feature is proposed for a CVT (continuously variable transmission) based parallel hybrid electric vehicle. The purpose of this study is to avoid using the engine to charge the battery directly, which provides improved energy efficiency. For this purpose, the recuperated energy during the regenerative braking is distributed in a geometric series way to the on-coming discharging processes which has a dynamic converging characteristic. A simulator is developed by the co-simulation of Cruise and MATLAB/Simulink. Performance of the proposed strategy is investigated by comparing with that of a rule-based control strategy. It is found from the simulation results that improved fuel economy is achieved and battery SOC (state of charge) is well maintained.