Fault detection of networked control systems with packet based periodic communication

Abstract

Abstract Fault detection of networked control systems (NCS) with communication constraints is discussed in this paper. A so‐called packet‐based periodic communication strategy is proposed and two kinds of optimal observer‐based residual generators are designed. One residual generator is designed based on the lifted model of NCS, which generates residual signals every communication period. The other works at a faster rate, i.e. it generates residual signals every sampling period and is more suitable for prompt fault detection. Comparison with traditional periodic‐communication‐sequence‐based scheduling strategy reveals superiority of this new communication strategy. Simulation results are also provided to illustrate effectiveness of the proposed method. Copyright © 2008 John Wiley & Sons, Ltd.