2.Narada Power Source Co.,Ltd., Hangzhou 311100, China)

 Abstract: Aiming at the problems of electric vehicle regenerative braking system stability, the fuzzy sliding mode control technique was investigated to regenerative braking process stability. After the analysis of the mutual relation and dynamic evolution of three kinds of braking modes during regenerative braking, and consideration the vehicle braking stability and braking energy recovery rate, the maximum braking force distribution strategy was presented to braking force loaded on motor regenerative force and front rear axle hydraulic braking force.With slip rate as the control object, the fuzzy sliding mode control strategy based on motor regenerative braking was established by combining the fuzzy control and variable structure control. The simulation analysis of the control strategy model was carried out on the actual vehicle parameters. The results indicate that fuzzy sliding mode control can achieve the reasonable swithch of electric vehicle braking mode,and verify the effectiveness of the control strategy.

 Key words: regenerative braking; sliding mode variable structure control; fuzzy control; stability