| Vehicle riding comfort is an important index for evaluating the vehicle performance, Improving vehicle riding comfort is always a hot issue for automotive designers.As a major part of vehicle, suspension system plays an important role in buffering the shock caused by pavement and attenuating vibration of automobile body caused by uneven terrain,whose performance greatly influent vehicle riding comfort. Semi-active suspension has become a hot research point,which not only overcomes the performance limitation of passive suspension but also overcomes shortcomings of high cost and high energy consumption of active suspension and improves the performance of suspension significantly.In virtue of the Zhejiang province key project"Technology and application of digital design for multi-vehicle sharing chassis platform",The co-simulation technology were carried out by using the software of ADAMS/View and MATLAB/Simulink to connect the semi-suspension control system model with the multi-body system dynamics model.The multi-body system dynamics model was established by using multi-body dynamics software ADAMS. According to fuzzy control theory, a fuzzy logic controller with two inputs and one output was designed by using MATLAB. A fuzzy PID controller was designed based on combining the advantages of both fuzzy logic control and PID control. The co-simulation were carried out by connecting the 2-DOF suspension dynamic model established by using ADAMS/View with the suspension control system model established by using MATLAB. And multi-body dynamics model of suspension is imported to MATLAB through ADAMS/Controls interface.Vehicle body acceleration, suspension dynamic travel and tire dynamic deflection are taken as the evaluation targets, The co-simulation under sine road and random road input are performed among passive suspension, semi-active suspension with fuzzy control and semi-active suspension with fuzzy PID control.The results indicate that performance of semi-active suspension is significantly better than passive suspension, Compared with fuzzy control, the fuzzy PID control strategy shows better control effect which greatly reduces the shock and vibration transferred from the road to the vehicle body and obviously improves the vehicle riding comfort.Co-simulation method avoid to derive complex dynamic equation of vehicle and the transfer function of control system which solve the difficult problem of setting up the mathematics model of semi-active suspension and reduce the times of experiments in trial production and test processes of physical prototype, It offers a new idea to the field of research on simulation and control of complex vehicle system.This paper makes analysis and simulation on the semi-active suspension, and it provides some reference value and guiding role for the semi-active suspension product research and development. |
