Design Of Automobile SASS With MR Damper Control System Base On μC/OS-Ⅱ

With the rapid development of speedway,people have made more demands on comfort of automobiles.Suspension of vehicle is the key component that have great influence on performance of vehicle. In recent years,because of its rapid response,wide bandwidth,low consumption of energy and simple structure compared with other forms of suspension,the semi-active suspension based on magneto-rheological(MR) damper that can improve ride comfort and stability of vehicle according to actual situation of real time has attracted much more atentlon in the research domain of intelligent structure.According to the trait of the semi-active suspension based on MR damper,the fuzzy logical that is implemented easily in the project is used in the system and the control parameters are vertical acceleration and variation ratio of vertical acceleration of vehicle.The circuit of charge amplifier,the circuit for processing vehicle speed signal, the drive circuit of constant current source, and the diagnostic circuit are designed based on ARM series single chip LPC2292. TheμC/OS-Ⅱ-imbedded Real-Time Operating System(RTOS) is introduced and transplanted successfully. The design idea and method of every software module in the semi-active suspension based on MR fluids is set forth. And the hardware and the software of anti-lock braking system are achieved in this paper.The test-bed and road experiment of the semi-active suspension based on MR damper control system in the automobile of CH711A is carried out. The results show the hardware circuit of the semi-active suspension based on MR damper control system is reasonable and the control strategy of software is accurate and effective. The system which can work steadily and reliably can decrease vibration of vehicle and improve ride comfort.