Performance Improvement of EV using K - Map Constructed Rule Based Energy Management Strategy for Battery / UC HESS

The performance improvement of Hybrid Energy Storage System (HESS) in Electric Vehicle (EV) has been in discussion over the last decade. The important issues in terms of performance parameters addressed are the range of the vehicle and battery (BA) peak current. This paper deals with both range improvement in EV and battery peak current reduction by applying a Karnaugh Map (K-Map) constructed rule-based energy management strategy to proposed HESS. The strategy allows Ultracapacitor (UC) to assist battery when the vehicle accelerates thereby reducing the burden on battery. Simulation is carried out for various operating modes of EV considering both urban and highway driving conditions. Simulation is done for different values of UC by keeping battery rating constant for each driving cycle and results are presented. The feasible value of UC is selected based on simulation results. The results of proposed HESS shows an improvement in performance parameters compared to Battery only Energy Storage System (BESS). Battery life is improved to a considerable extent and there is an overall development in the performance of electric vehicles.