Fuzzy logic energy management system of series hybrid electric vehicle

Power flow control mechanism of multiple power sources within series hybrid electric vehicle (HEV) is very vital to boost the vehicle performance. However, it is very difficult to acquire the suitable method in controlling the power flow due to the nonlinear system nature of power sources in series HEV. In this research, fuzzy logic control (FLC) is designed for discharge and charge of the batteries using three different shape and distribution of membership function (MF). Membership function shape and distribution slightly affect the performance of power flow between coupled internal combustion engine (ICE) with generator and batteries. Based on simulation, the Triangular MF is decided for the system since it can compensate the power flow performance and lower the fuel consumption. The simulation results show the effectiveness of fuzzy logic control in distributing power flow between ICE-generator and batteries to drive the electric motor.