Optimal Control System Analysis of Vehicle Steering Mechanism Based on Closed-Loop Algorithm
When a four-wheel vehicle turns and the steering center of the front and rear wheels is one point,it is regarded as the theoretical optimal steering of the vehicle and the goal of optimal control.Aiming at the commonly used multi-link steering sys-tem,the system control was analyzed,according to the structural characteristics and angle relationship.Based on the closed-loop control algorithm,the optimal control of the steering system was designed and analyzed,according to the steering control quantity obtained by the target path and parameter feedback.At the same time,the state variables and prediction parameters of the system were analyzed.Based on the actual vehicle and steering optimal control system,the changes of various parameters of vehicle operation under no-load condition and turning at 30km/h were analyzed,and compared with the theoretical optimal value to verify the effectiveness of the control system.The results show that:the state variables of the control system are predicted by discrete analysis and half step integration,and the accuracy is high.In the steady-state turning condition,with the lifting of the vehicle,the radius of the steering track gradually increases,and the vehicle shows obvious understeer characteristics.Under the two working conditions,the characteristic curves obtained by the steering control system are highly consistent with the theoretical values,and the peak error of the two is controlled within 5％,indicating the reliability of the optimal control algorithm,which provides a reference for such design optimization.
VehicleSteering MechanismClosed-Loop Control AlgorithmOptimal ControlActual Vehicle
万方数据
维普
