Research On VehicleAnti-Rollover Control System

In recent years, the number of vehicle rollover accident is increasing, the extent ofits damage is the most serious only under crash in all of road traffic accidents. Therefore,vehicle rollover has drawn much more attention of both more and more experts andscholars at home and abroad and the major car manufacturers. In other countries, thestudy on car rollover stability has been rapid development, and has been gradually usedin the real vehicle equipment, relatively speaking, the domestic started late on thisdirection, and mainly still in the phase of theoretical research.In this thesis, on the basis of the previous results and around the theme of vehiclerollover control, a specific SUV (Sport Utility Vehicle) type is selected for the study, aseries of control design and simulation analysis are made because of its more easierrollover occurred shortcomings contrast the average car with its high center of mass andthe relatively small track. First, the knowledge to build a simplified model of vehicle isintroduced in this thesis, and a three DOF vehicle rollover model, a tire model and aseries of models which provide the solid foundation for the further simulation studies areestablished. then, on the basis of vehicle rollover theory, the SUV rollover control systemis designed with sliding mode control, the major tasks include: the theory analysis ofsliding mode based variable structure control, the design of sliding mode based variablestructure controller and the buffeting eliminating, and according to external interferenceconditions, further research is study on the effectiveness of the control system, thisthesis selects two pairs of vehicle rollover obvious interference: inclined road surfacedisturbance and lateral wind interference, and coverers complete description for theirprinciple model. Finally, the SUV rollover control system co-simulation with asimulation platform of Matlab/Simulink and CarSim simulation software, to verify thevalidity and reliability of this control system. The maneuvers of include emergencydouble lane change, Fishhook steering and J-steering are given and considering thedifferent interference conditions, this thesis selects the lateral acceleration, Lateral-LoadTransfer Ratio which closely related the vehicle rollover parameters for a comparativeanalysis. The simulation results show that the control system under different workingconditions and interference can effectively improve the performance of SUV rollover.Limited to the experimental conditions, this thesis only has a simulation study onSUV rollover control system and has made certain assumptions and simplified ininterference model and vehicle dynamics model, it verifies the feasibility of the controlstrategy and has some reference value for further the theoretical study and the realvehicle test.