Research Article
Guaranteed Cost Fault-Tolerant Control for Networked
Control Systems with Sensor Faults
Qixin Zhu,
1,2
Kaihong Lu,
2
Guangming Xie,
3
and Yonghong Zhu
4
1
School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
2
School of Electronical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China
3
Department of Mechanics and Engineering Science, Peking University, Beijing 100871, China
4
School of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China
Correspondence should be addressed to Qixin Zhu; bobcn@.com
Received June ; Accepted November
Academic Editor: Jinhui Zhang
Copyright © Qixin Zhu et al. is is an open access article distributed under the Creative Commons Attribution License, which
permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
For the large scale and complicated structure of networked control systems, time-varying sensor faults could inevitably occur when
the system works in a poor environment. Guaranteed cost fault-tolerant controller for the new networked control systems with
time-varying sensor faults is designed in this paper. Based on time delay of the network transmission environment, the networked
control systems with sensor faults are modeled as a discrete-time system with uncertain parameters. And the model of networked
control systems is related to the boundary values of the sensor faults. Moreover, using Lyapunov stability theory and linear matrix
inequalities (LMI) approach, the guaranteed cost fault-tolerant controller is veried to render such networked control systems
asymptotically stable. Finally, simulations are included to demonstrate the theoretical results.
1. Introduction
Feedback control systems wherein the control loops are
closed through a real-time network are called networked
control systems (NCS) [].Duetotheirsuitableandexible
structure, NCS is frequently encountered in practice for such
elds as information technology, life science, and aeronau-
tical and space technologies. However, there exist not only
induced delay, data packet loss, and sequence disordering in
NCS, but also actuators or sensors faults, which could cause
negative impact on the performance of the system and even
lead to system instability. Recently, the fault-tolerant control
of NCS has become a new popular issue in the control eld
[–].
A fault-tolerant control algorithm for networked control
systems is proposed based on Lyapunov stability theorem
by Zheng and Fang []. Qu et al. have devised a fault-
tolerant robust control for a class of nonlinear uncertain
systems with possible sensor faults considered and developed
a robust measure to identify the stability- and performance-
vulnerable failures []. e faults of each sensor or actuator
were taken as occurring randomly by Tian et al. [], and
their failure rates are governed by two sets of unrelated
random variables satisfying certain probabilistic distribution.
A sucient condition is given by Zhang et al. [], which could
guarantee the stability of NCS with sensor failures or actuator
failures and guarantee robustness to parameter uncertainties,
but the issue of guaranteed cost is not discussed. A robust
fault-tolerant control based on the integrity control theory
when actuator faults occur is discussed by Zhang et al. [].
Wang et al. [] investigated the issue of integrity against
actuator faults for NCS under variable-period sampling, in
which the existence conditions of guaranteed cost faults-
tolerant control law are testied in terms of Lyapunov
stability theory, but not referring to the eects of uncertain
parameters.
Almost all literatures above consider the faults in some
special cases. However, in practical application, because of
large scale and complicated structure of NCS, the faults could
vary from time to time when the system works in a poor
environment. It is of great importance to explore a reasonable
control method to guarantee the performance of NCS when
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Mathematical Problems in Engineering
Article ID 549347