Design And Research On In-Wheel System Of Deceleration And Driving

The vehicle population of the world is huge and increasing at high speed. Research on Electric Vehicle(EV) is both favorable for the state and the citizens. Concretely, it's propitious to environment protection, oil saving and the development of national auto industry. During "the 11th Five "period, Science &Technology Ministry of China(STMOC) started up "Energy-saving and New Resource Vehicle" program, this program focuses on research and develop of EV and Fuel Vehicle, Dynamics Systems, key automotive spare parts techniques and system assembling techniques. In "the 12th Five" program, the Nation strengthened the interests in EV, the technique creation system is expected to be improved, and the original creative ability is to be enhanced. More over, the program plans to speed the research on technical standard, and explore ways of high-efficient creative mode. EV pilot project in some cities and public R&D platform will be completed.Environmental protection and energy saving are the great theme of the 21st century world. By that, China has given a policy of building economical society including a sub policy of developing small vehicles. An approach to make that true is to develop electric vehicles. Though there is a history of R&D on EV, the industrialization has never come by the limit of battery, motor and control strategy.In this thesis, EV and active wheel developing history and recent status are described. After classifying the active wheel and traditional suspension system, select the right active wheel and the type of front suspension and rear suspension. Determine the prototype model and build the virtual prototype model of the vehicle for analysis and optimization design of handling performance and ride performance. First of all, the paper has built the complex car model by ADAMS/view for analysis, especially built the parametric model of double-wishbone suspension. Paper carried out kinematics simulation analysis to front suspension. The changes of wheel alignments including inclination angle,caster angle,camber angle,toe angle, and sideways displacement were presented when wheels bumped and rebounded, and find out the deficiency of suspension system. Paper carried out steady static circular test procedure to analyze the handling stability of the model car. Secondly, Paper carried out simulation analysis for ride performance. Paper started research form system transfer characteristic. Paper carried out simulation analysis of ride performance that based on"GB/T5902₈6 ride performance test on pulse road for automobiles", and find out the deficiency of model car in ride performance.In the end, Paper used parametric design study to optimize the front wheel alignment, and modified the parameter of Front Wheel Alignment. Paper analyzed the factor of influencing the ear ride performance to find out the improvement. Project and simulated checking test. Paper carried out the other simulation analysis for handling stability with the improved car model. Simulation results have been contrasted to original car model. The aim of contrast is to validate the improvement.