Phase‐Plane Stability Boundary Identification‐Based Active Front Wheel Angle Control for a Steer‐by‐Wire Vehicle

ABSTRACT Steer‐by‐wire (SBW) technology enhances vehicle dynamics by eliminating mechanical constraints. However, ensuring lateral stability against road disturbances remains challenging. This paper proposes an intervention‐based active steering control strategy. A sideslip angle–yaw rate phase plane identifies stability boundaries via a particle swarm optimization–backpropagation (PSO‐BP) neural network, generating nonlinear intervention factors for active steering, integrated into a sliding mode controller. To ensure precise steering angle tracking, a Linear Active Disturbance Rejection Control (LADRC) method is developed. Hardware‐in‐the‐loop simulations and real‐vehicle tests verify that the strategy effectively mitigates instability under complex conditions. Compared with PID control, the LADRC‐based tracking control improves step‐response dynamics and disturbance rejection, demonstrating strong potential for practical vehicle applications.