Abstract
In this paper, the problem of sensor fault and delay tolerant control problem for a class of networked control systems under external disturbances is investigated. More precisely, the dynamic characteristics of the external disturbance and sensor fault are described as the output of exogenous systems first. The original sensor fault and delay tolerant control problem is reformulated as an equivalence problem with designed available system output and reformed performance index. The feedforward and feedback sensor fault tolerant controller (FFSFTC) can be obtained by utilizing the solutions of Riccati matrix equation and Stein matrix equation. Based on the designed fault diagnoser, the proposed FFSFTC is further reconstructed to compensate for the sensor fault and delayed measurement effects. Finally, numerical examples are provided to illustrate the effectiveness of our proposed FFSFTC with different cases with various types of sensor faults, measurement delays and external disturbances.
Highlights
Fault tolerant control has been viewed as an excellent control approach in modern industrial processes, which can provide stricter security and reliability performance for practical systems [1,2].networked control systems (NCSs) have been integrated into automatic control systems with the technologies of dependent actuators, sensors and microprocessors [3,4,5,6,7]
In order to eliminate the influence from the sensor fault and external disturbance, a fault diagnoser has been designed and a sensor fault and delay tolerant control scheme has been proposed in this paper
By introducing a vector transformation, an available delay-free system output was designed and an augmented system was constructed by combining the control system and external disturbances
Summary
Networked control systems (NCSs) have been integrated into automatic control systems with the technologies of dependent actuators, sensors and microprocessors [3,4,5,6,7]. A great deal of attention has been focused on the compensation of delayed measurements, in which the observer techniques and the fault accommodation strategies play an important role in obtaining the goals of sensor fault tolerant control for NCSs. With regard to observer techniques, a local observer was proposed to provide the information of both state, uncertainty and fault information in [15]; a new observer-based reduced-order fault
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