Study On Control System Of Semi-active Suspension With Magneto-rheological Dampers

With high speed development of highway network and vehicle innovation, thedemand of people on the car ride comfort and seat comfort is increasingly severe.Semi-active suspension system based on Magneto-rheological fluid damper breaksthrough the performance limitation of the traditional passive suspension system, whichcould be more adaptive with the road conditions, and improve passengercomfortableness and ride comfortableness remarkably. Therefore, the study ofsemi-active suspension system has gained important theoretical significance andengineering application value.MR fluid damper design and semi-active suspension control strategy is two of themost important key technologies of intelligent suspension system. In this paper,self-made MR fluid damper is the research object, and damping force vs. displacementcharacteristic and damping force vs. velocity characteristic test is conducted accordingto the national standard. Then the polynomial model of the MR fluid damper has beenestablished. So semi-active suspension controllers based on Hybrid PID Fuzzy controlhave been built, and Matlab/Simulink software simulation and hardware in the loopsimulation experiment have been done to analyze the control effect of the semi-activesuspension HFPID strategy. The main research work is as follows:①MR fluid damper is experimented on MTS test-bed. Damping force vs.displacement characteristic and damping force vs. velocity characteristic test of MRfluid damper is conducted according to the national standard. And the polynomial modelhas been established.②Common discrete pavement and continuous random input road model has beenestablished, and dynamic model with8degree-of-freedom including suspension systemand seat has also been established, which creates a good foundation for the suspensioncontrol strategy study.③Hybrid PID Fuzzy (HFPID) control strategy is put forward and correspondingsemi-active suspension controller is built in Matlab/Simulink. Simulation experimentof HFPID and passive, PID, fuzzy control strategies of semi-active suspension has beendone in the same simulation condition. Afterwards seat suspension control with fuzzystrategy is adopted to attenuate the seat vertical vibration.④dSPACE hardware-in-the-loop simulation experiment has been conducted, which verifies the effectiveness of motioned control methods above.