Composite braking control strategy for electric vehicles based on different adhesion coefficients

In order to better balance the energy recovery and braking safety and stability in the composite braking process, this study takes the electromechanical composite braking system as the research object and proposed a composite braking control strategy based on different attachment coefficients. Firstly, the braking force distribution curves under various adhesion coefficients were designed based on the representative front and rear axle braking force distribution curves. On the basis of this, a fuzzy controller that can adjust the power of the electric mechanism is designed by using fuzzy algorithm considering the braking strength and other factors to improve energy recovery. Finally, a joint simulation using MATLAB/Simulink and AVL Cruise is performed. The results show that the control strategy can be applied to roads with varying of adhesion coefficients, which not only ensures the braking safety and stability, but also effectively improves the energy recovery. When the vehicle implements energy recovery on a high adhesion road surface, mode 1 of the control strategy in this paper increases the energy recovery by 301 kJ and 876 kJ, respectively, compared with the ideal braking force distribution strategy and the no energy recovery strategy; the battery SOC increases by 0.49% and 1.43%, respectively.