| Fast and effective air suspension control strategy can not only adjust the vehicle body posture timely and accurately, but also improve vehicle capacity in harsh environments and complex road effectively what are the main means to improve vehicle safety.The domestic and foreign suspension system control strategy are introduced in this paper firstly and then the purpose and significance of this paper are put forward; the vertical stiffness mathematical expressions of air spring with auxiliary chamber is derived and the air suspension vertical stiffness characteristic is studied by AMESim simulation platform; an incentive-based road roughness random model is established, and time-domain simulation about the model of moderate random road are studied by MATLAB/SIMULINK; the performance evaluation for air suspension is presented based on stiffness characteristic analysis; based on sliding mode control theory, dynamical equations of semi-active air suspension and the rate of surface switch equations are established by using pole placement method; in MATLAB/SIMULINK the time domain and frequency domain simulation was done;in order to improve the suspension performance, combining the fuzzy control theory, a fuzzy sliding mode controller is presented and at C level road, excitation of semi-active air suspension is simulated and analyzed.The full text of the study and simulation analysis showed that: compared to the traditional leaf springs and coil spring suspension, air spring suspension has obvious advantages to improve vehicle ride comfort and improve ride comfort, air suspension sliding mode controller can improve vehicle ride performance effectively, it has important theoretical and practical significance to car suspension. |
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