Study On Vehicle Semi-active Suspension Control Algorithm Based On Controllable Damper

Now, the car is widely used in People’s Daily life, which have been bringing great convenience to people’s life. The performance of cars have a direct impact on ride comfort of people, so improving the performance of cars will make people be more comfortable. Most technicists pay more and more attention to solve the problem that can quickly and efficiently improve comfort stability of the car. And this is the topic of the paper. The vehicle suspension system which slow down the the vehicle vibration transfered by the road excitation is one of the most important parts of the vehicle. So the suspension system play a great role in improving the vehicle riding comfort. To improve the performance of the suspension, the key is to reasonable control the suspension system of the car.Traditional passive suspension with low cost and simple structure is a widely used suspension system. But the passive suspension is difficult to adapt to different road conditions since the parameters of the passive suspension cannot be changed. Passive suspension play a role in the specific road conditions, which can not meet the requirement of the people on the performance of the vehicle. Compared with that of the passive suspension, semi-active suspension of the vehicle can adjust the spring stiffness or damping force of shock absorbe by using control algorithm to stabilize the vehicle. In the meanwhile, the performance with the low energy consumption and stabilization of the semi-active suspension is close to that of the active suspension. So this paper studies the model of the full vehicle and the control method of the semi-active suspension system.In actual application, the control object of the semi active suspension system is damper, and the magnetorheological damper because of its high response speed, low power consumption, reliable control performance and other advantages is widely used at present. In this paper, the MR damper which is the controlled object of the semi-active suspension system is introduced into the semi-active suspension system. For vertical, roll, pitch, all three elements of the body, designed the coordinate parallel control strategy of the vehicle semi-active suspension system.The change of body vertical, roll and pitch vibration is inputted to the controller respectively,the regulating force outputted of the body is decomposed into four magnetorheological dampers by geometric operation.The inverse model of the magnetorheological damper is used to transform the decomposition force to the corresponding control current,the current control the magnetorheological damper, which can achieve the purpose of improving the vibration of the vehicle. Passive suspension and semi-active suspension are simulated respectively for the speed of 10m/s,20m/s,30m/s and the road of B, C level by MATLAB/Simulink software. The experiment and the result of data analysis show that the semi active suspension system that based on the parallel coordinated control strategy the is used.Under different speed and different road grades, the vertical acceleration of the vehicle body, the acceleration of the lateral inclination angle and the acceleration of the pitch angle will be improved significantly, and the dynamic deflection and the dynamic load of the wheel are kept stably.In the premise of not affecting the safety of the vehicle, the vehicle ride comfort and handling stability are improved, which verify the validity of the control method proposed in this paper.