| With the rapid development of national economy, both of vehicle population and traffic accidents are increased considerably. It put forward the major issues for the vehicle safety. Braking system is the key factors to vehicle travel safety, especially in the design of vehicle running at high speed. Braking efficiency is increasingly valued and become one of vehicle performance indexes. So how to improve the safety of vehicle braking is always the focus issue to engineers.Simulation technology is being used more and more widely in the field of engineering. With the development of multi-body dynamics, virtual prototype technology is applied to study the vehicle braking performance.In this dissertation, by using virtual prototype technology and the software ADAMS/CAR, a virtual prototype of the full vehicle was built. The straight-line braking and turning braking safety and stability have been analyzed by vehicle dynamic simulation according to the national standard. Braking efficiency is able to fulfill the standard except braking force distribution. Another, there is a certain gap between designing vehicle and prototype vehicle. So the optimization of the braking system is needed to be carried out.With braking force distribution coefficient made to design variable,genetic algorithm is used to improve braking force distribution. The straight-line braking and turning braking safety and stability have been compared before and after optimization. Braking performance thus obtained prove remarkably.Furthermore,fuzzy control and finite state machines were used to design anti-lock braking system ABS controller. Under the cooperative simulation mode between ADAMS and MATLAB software, the assessed precision of anti-lock braking system is given according to the national standard. Finally, the results of The straight-line braking and turning braking safety and stability show that anti-lock braking system could effectively improves the braking performance for the vehicle. |
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