Design of unknown input observers and robust fault detection filters
作者:
JIE CHEN,
RONJ. PATTON,
HONG-YUE ZHANG,
期刊:
International Journal of Control
(Taylor Available online 1996)
卷期:
Volume 63,
issue 1
页码: 85-105
ISSN:0020-7179
年代: 1996
DOI:10.1080/00207179608921833
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Fault detection filters are a special class of observers that can generate directional residuals for the purpose of fault isolation. This paper proposes a new approach to design robust (in the disturbance de-coupling sense) fault detection filters which ensure that the residual vector, generated by this filter, has both robust and directional properties. This is done by combining the unknown input observer and fault detection filter principles. The paper proposes a new full-order unknown input observer, and gives necessary and sufficient conditions for its existence. After the disturbance de-coupling conditions are satisfied, the remaining design freedom can be used to make the residual have the directional property, based on the fault detection filter principle. A nonlinear jet engine system is used to illustrate the robust fault isolation approach presented. It is shown that linearization errors can be approximately treated as unknown disturbances and be de-coupled in the design of a robust fault detection filter. Simulation results show that mis-isolation of faults can be avoided using the robust scheme.
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