Range extension control system for electric vehicle based on searching algorithm of optimal front and rear driving force distribution

Electric vehicles have a disadvantage in that the cruising distance per charge is short. This paper proposes a range extension control system based on a searching algorithm of front and rear driving force distribution with total efficiency optimization. The proposed method maximizes the total efficiency considering the slip ratio and the losses in the motors and inverters. The effectiveness of the proposed method is verified by experiments using a plug-in hybrid electric vehicle. The mileage per charge can be extended by 18% by using the proposed method in a constant-speed test.