Research on anti-lock braking control strategy of distributed-driven electric vehicle

Abstract

Aiming at the problem of the stability of distributed-driven electric vehicles under braking conditions and the recovery of regenerative braking energy, a novel compound brake anti-lock braking control strategy based on wheel slip rate control is proposed. This article takes distributed-driven electric vehicles as the research object. From the perspective of the single-wheel braking dynamic model of the car, the method of designing a non-linear state observer is used to observe the changing longitudinal braking force of the wheel, and then to achieve the estimation of the optimal slip rate. Using the improved adaptive sliding mode controller to achieve effective control of the optimal slip rate to improve the chattering problem of sliding mode control. According to the output of the controller, combined with the motor brake and hydraulic brake system of the car, a composite brake anti-lock control system is designed. The joint simulation is carried out in the environment of MATLAB and CARCISM. The simulation results show that the control method studied can effectively estimate and control the optimal slip rate under various complex road surfaces, and realize the safety and stability of electric vehicle brake control.