Dual-Motor Electro-Hydraulic Braking System Based on Fuzzy Sliding Mode Control

The brake-by-wire system is a fundamental and critical component of intelligent electric vehicles. Achieving precise actuator motor response is essential for brake-by-wire braking performance. To address this issue, this article proposes a fuzzy sliding-mode control method for a dual-motor electro-hydraulic braking system. An innovative model of the braking system is established, incorporating the motor, deceleration mechanism, brake master cylinder, brake wheel cylinder, and hydraulic system. Firstly, dynamic models for the permanent magnet synchronous motor (PMSM), the reduction mechanism, the brake master cylinder, and the brake wheel cylinder are developed. Subsequently, the feasibility of the redundant structure is verified. Finally, a novel composite convergence law-based fuzzy adaptive sliding mode control (SMC) method is designed. Simulation results demonstrate that this approach effectively reduces motor response time and enhances braking performance.