Research On Active Suspension Control Method For Roll Suppressing

Due to the interference of the road roughness or the centrifugal torque caused by the steering,the vehicle body will produce the roll motion,which affects the riding comfort and safety of the vehicle.It is assumed that the vehicle is running at a constant speed.In this paper,the active suspension is used as the actuator,and the active suspension control strategy is designed respectively for the main purpose of suppressing the roll motion of the vehicle.In this paper,the dynamic modeling and simulation analysis of pavement excitation and vehicle active suspension are carried out,and the stochastic pavement excitation model and impulse pavement excitation model are established.In addition,according to the problem of roll restraint,this paper ignores the weak influence of pitching motion on vehicle roll,so as to establish a four-degree-of-freedom half-car model with vertical and roll motion.The performance evaluation index of the vehicle active suspension system is expounded.Based on the establishment of the road surface incentive model and the active suspension half-car model,this paper further studies the active suspension control method under the straight condition of the vehicle.Firstly,this paper designs the optimal state feedback controller to improve the overall performance of the vehicle.In the process of controller design,the influence of different weighting factors on vehicle performance index is obtained and analyzed by analytic hierarchy process.The simulation results show that the optimal control can improve the overall performance of the vehicle,but the optimal performance of the vehicle is optimized by the optimal control at the expense of other performance.In order to compensate for the shortcomings of a single optimal control strategy,this paper compares the optimal state feedback control with the fuzzy control to obtain the optimal-fuzzy integrated controller.Based on the optimal state feedback control to improve the overall performance of the vehicle,The body roll angle is suppressed by the fuzzy control so that the roll angle changes in a small range.In order to solve the problem of vehicle steering,this paper firstly analyzes the relationship between disturbance torque,lateral acceleration and front wheel steering angle.Then,in the case of pavement excitation,a linear quadratic output feedback controller is designed.In this paper,the sliding mode controller with direct anti-roll moment is designed to suppress the steering roll and analyze the stability and simulation of the sliding mode controller.The simulation results show that the sliding mode controller It is possible to effectively suppress the steering roll and improve the safety when the vehicle is turned.