Adaptive fixed-time output feedback fault tolerant control for input-quantized perturbed planar nonlinear systems

The problem of output feedback control for a class of input-quantized perturbed planar nonlinear systems with multiple faults and uncertain parameters is investigated under the fixed time convergence scheme. Different from the existing works on the finite-time fault tolerant schemes and deterministic system stabilization strategies, this paper consider the novel adaptive parameter compensation method to accommodate the unknown actuator faults and the the hysteresis quantizer parameters in fixed time. In order to solve the full state measurable limited problem, the fixed-time observer scheme is proposed by using the the bi-limit homogeneity technique. Finally, the global practically fixed-time stability of the adaptive output feedback FTC systems is proved by adaptive back-stepping technique and Lyapunov theory analysis.