Power split control strategy for a series Hybrid Electric Vehicle using fuzzy logic

Abstract

Hybrid Electric Vehicle (HEV) is considered as the most promising solution to energy crisis and urban air pollution. However, it is a complex electro-mechanical system which is difficult to construct an accurate mathematical model. Fuzzy logic seems to be appropriate for the HEV control problem. In this paper, a Fuzzy Logic Control Strategy (FLCS) is developed for a series hybrid electric vehicle designed for campus and gymnasium. Based on the State-of-Charge (SOC) of the batteries and the power information, the power required by the vehicle is split between the engine/generator set and the batteries instantaneously by the FLCS. The SOC of the batteries can be maintained always at a high level and the engine can steadily work in its high efficiency area. A forward simulation model for the vehicle is established, and both off-line and realtime simulations are performed. Simulation results show that the FLCS can realize constant SOC control, and fuel consumption and emissions are also considered by the FLCS.Index Terms -hybrid electric vehicle; control strategy; fuzzy logic; constant SOC control.

Real-Time Simulation Study for a Series Hybrid Electric Vehicle

“…The controller can be divided into 3 parts: torque demanded module, vehicle working mode switching module and fuzzy logic control strategy module. The fuzzy logic control strategy designed for the SHEV studied may realize constant SOC control, which is stated in reference [8][9][10]. The total vehicle controller simulation model is designed as fig.…”