Body height robust control of automotive air suspension system using finite‐time approach

One of the essential characteristics electronically controlled air suspension (ECAS) is that automotive height adjustable. Because ECAS system has complex nonlinearity and noticeable hysteresis, it easy to make vehicle oscillate near target due overcharge/discharge springs, which would cause instability body posture. More than that, existence external disturbances uneven loads impacts on control. The nonlinear interference put forward higher requirements for design controller. In this paper, by non-singular coordinate transformation, model 1/4 regulation transformed into a linear with third-order integral chain firstly, closer real dynamic low order. Secondly, based continuous finite-time theory, feedback stabilization controller small parameters designed, turned out can achieve stability. Finally, simulation results under sinusoidal random show comparison traditional PD control, designed not only guarantee faster response speed better control accuracy but also obtain anti-jamming performance. By innovatively applying theory system, in paper afford good robustness adjustment great significance improve overall performance system.