A combined method for estimating vehicle side slip angle is published in this paper.Nonlinear factor is introduced to identify the nonlinear degree of vehicle state.A simplified nonlinear side force calculation method is proposed.Then the Kalman filter is designed based on the single-track vehicle model associated with the influence of tire cornering stiffness.The evaluation system is constructed based on wheel speed sensor,lateral acceleration and yaw rate sensor,steering angle sensor,MicroAutoBox and GPS ...