A Research On Modeling And Control Of A Quarter-Car Model With Double-Wishbone Suspension

With the development of the automotive technology and the higher requirement on automobile performance,the top-ends cars have been equipped semi-active or active suspension to achieve high ride quality and good handling performance.But Practical technology of vehicle semi-active and active suspension systems is under developing.Firstly,suspension system model,the influence of rubber bushings for suspension system and semi-active and active suspension control algorithms are investigated based on the domestic and international papers.Secondly,the simplified model,quarter-car model with Macpherson suspension and quarter-car model with double-wishbone suspension are developed.The responses of three models are compared to analyze the accuracy of the simplified model.Then,based on the calculated dynamic responses of a quarter-car model with doublewishbone suspension,the method for identifying the values of mass,stiffness and damping of simplified model is developed.The equivalent model is developed with the parameters of identified values and the method of identification is proved.The influences of the bushing and top-mount in the suspension on the identified values of parameters are investigated.Next,the control strategies for semi-active suspension,such as SH 2-states,ADD,SHADD,PDD and SH-PDD control,and a sliding mode control algorithm based on a reference model for active suspension are investigated based on the equivalent model.In order to access and to compare the performance of the control strategies for semi-active suspension,simulated analyses of sprung mass acceleration under each semi-active control strategies are proposed.The influences of the values of mass,stiffness and damping at the model on the controlling effect of SH-PDD and sliding mode control algorithms is investigated to demonstrate the importance of exactness of the parameters.Finally,the validity of SH-PDD and sliding mode control algorithms are demonstrated using the experimental data.The influences of the values of mass,stiffness and damping at the model on the controlling effect is investigated by experiments,the results of which demonstrates the simulated results.The proposed research and the results could provide a research idea for the scientific research and serve as reference for designing vehicle semi-active and active suspension systems.