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		Yanwei WANG,Ying ZHENG.[en_title][J].Control Theory and Technology,2005,3(1):55~59.[Copy]

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YanweiWANG,YingZHENG
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Received:September 04, 2003Revised:February 18, 2005

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Kalman filter based fault diagnosis of networked cont rol system with white noise

Yanwei WANG, Ying ZHENG

(Computer Aided Design Center , Huazhong University of Science and Technology ,Wuhan Hubei 430074 , China;Department of Control Science and Engineering , Huazhong University of Science and Technology ,Wuhan Hubei 430074 , China)

Abstract:

The networked control system NCS is regarded as a sampled control system with output time- variant delay. White noise is considered in the model construction of NCS. By using the Kalman filter theory to compute the filter parameters ,a Kalman filter is constructed for this NCS. By comparing the output of the filter and the practical system ,a residual is generated to diagnose the sensor faults and the actuator faults. Finally ,an example is given to show the feasibility of the approach.

Key words: Networked control system Fault diagnosis Kalman filter