Study On The Identification Of Driving Road Condition And Real-time Optimization Damping Match Of Automobile Semiactive Suspension System

There has not been continuouscontrolled semiactive suspension system of real-time optimization damping match under different driving conditions, for it is restricted by identification of driving road condition, suspension design theory, valve parameters design and characteristic simulation theory of damper, control law, and so on. At present, most of them are shift-selected, price is high, so, hard to be widely used. With the development of auto-industry and the increase of driving speed, higher requirements of dirving safety and riding comfort are put forward. In this paper, some research was conducted, aiming at the problems. The innovations are as follows:(1) With ride vibration analysis based on 1/4 model of vehicle suspension and the model of damping characteristic simulation, by the relation of body vibration acceleration, travel speed and vehicle parameters, the identification model of driving road condition was built, based on vibration acceleration and travel speed.(2) With vehicle smoothness analysis, by vibration acceleration and wheel dynamic load, the joint optimal objective function of damping ratio was established, by constraint of suspension dynamic flexibility, the model of real-time optimization damping ratio of semiactive suspension system was deduced.(3) According to the elasticity theory, by the boundary and deformation continuity condition, the deformation analytic formula of throttle slice under non-uniform pressure was established.(4) With the real-time optimization damping match as the controlling target, according to the optimal design model and method of valve parameters, the controlling law of damper hole was established.Besides, the deformation analytic formula of rubber bush and the optimal design model of stabilizerbar were established; the model of real-time optimization damping ratio of semiactive suspension system in turning states was built; the experimental controlled damper was developed, the control system was developed.By simulation, the results show that the suspension system developed meets the requirements of driving safety and riding comfort, and its design and control theory is correct. This research has important theoretical and application value for the design and control of semiactive suspension.