Study Of Automobile Active Suspension Control Algorithm And Test System

With the increasing requirement of the vehicle's ride comfort and road security, the design of suspension with good performance has become more and more important. As the conventional passive suspension has the constant spring stiffness and damper coefficient, it can not change with the road disturbances and loads, so it is necessary to design a new-style suspension—active suspension. Active suspension develops with the modern control theory and the electronic technique, its stiffness and damper coefficient can change to adapt the different work circumstances, and it improves the vehicle ride comfort and road holding. So it is significant to research and develop active suspension.The study of active suspension can divide into two aspects: the different structure of active suspension and the control law. In order to get the good performance, the different mathematical modes and control laws will be used. This thesis makes a deep study and analysis of automobile active suspension control system, which includes control algorithm, development of active suspension test bed and control algorithm's realization.Firstly,this thesis analyze and research some familiar active suspension control algorithm, just as PID, FUZZY, FUZZY self-adapt PID(FAPID). Moreover it lays emphasis on the excellence of the application of the FAPID.Secondly, based on theoretical study, this thesis takes 1/4 vehicle 2 DOF suspension system model as control object to do computer simulation. FAPID control can obviously restrain the vibration of vehicles in terms of different stimulation. Therefore, FAPID is practical and effective.Thirdly, I rebuilded the rider simulator and redesigned the measuring and control system. In order to quicken the development and economize the outlay, PCI-DAQ structure is choosed as hardware architecture and the control system based on LabVIEW. The above-mentioned active suspension control algorithm is transplanted to the control system.Finally, this thesis carries out the substantial device experiment of vehicle active suspension. Computer simulation and substantial device experiment of vehicle suspension both reveal that the application of FAPID to the system of vehicle active suspension can produce notable effects on decreasing the vibration and improving the whole performance of vehicles in terms of different stimulation. The conclusion of experiment will guide the actual vehicle experiment and apply in the future preferably.