Fuzzy Adaptive Fault-Tolerant Control for a Class of Active Suspension Systems with Time Delay

This paper investigates the fuzzy adaptive fault-tolerant control design problem for a class of electromagnetic active suspension systems. The change of the contact between the tire and the ground is studied to increase the vehicle stability in the presence parameter uncertainties. Meanwhile, considering the nonlinearity of the spring in the suspension space, the characteristics of the damper are studied to form the basis of accurate control. Furthermore, unknown time-varying delay and dynamic abrupt fault are considered, which helps deal with emergencies and transmission delays. Fuzzy logic systems (FLSs) are utilized to identify the unknown dynamics. On the basis of Lyapunov stability theory, it is proved that all the signals of the closed-loop system are semi-globally uniformly ultimately bounded (SGUUB). Finally, the simulation results verify the feasibility and effectiveness of the proposed control approach.