Yaw stability control of tractor vehicle based on nonsingular fast terminal sliding mode

Abstract

Yaw stability is very important for commercial traction vehicles, the yaw stability control of traction vehicle based on nonsingular fast terminal sliding mode is studied in this paper. Firstly, the sliding mode control with high robustness is selected for the yaw moment controller, and the traditional sliding mode, fast terminal sliding mode, and nonsingular fast terminal sliding mode (NFTSM) are derived. The rear axle side deflection angle is monitored, and the traditional yaw stability control strategy is improved. When computing actuator response value, the calculation of the target slip rate and the target engine torque are added on the basis of the traditional calculation of the target braking pressure, and the variable parameter PID method is introduced in the torque calculation part to improve the effect of torque control. A simulation and a real vehicle test are carried out, and the results show that the effect of the developed nonsingular fast terminal sliding mode controller is significantly better than the fast terminal sliding mode method and has strong vehicle directional stability.