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Fault diagnosis with disturbance rejection performance based on disturbance observer

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2 Author(s)
Songyin Cao ; Res. Inst. of Autom., Southeast Univ., Nanjing, China ; Lei Guo

In this paper, a new fault diagnosis approach presented for a class of non-linear systems with external disturbances. The unknown disturbances are supposed to be rated by an exogenous system, where some classical assumptions on disturbances can be removed. It is shown that it will be difficult to diagnose the fault if disturbances and faults exist simultaneously in the system. To overcome this obstacle, a new composite observer is constructed by combining a fault diagnosis observer with a disturbance observer, with which the fault can be estimated and the disturbances can be rejected at the same time. Finally, simulation is given to show the efficiency of the proposed approach.

Published in:

Decision and Control, 2009 held jointly with the 2009 28th Chinese Control Conference. CDC/CCC 2009. Proceedings of the 48th IEEE Conference on

Date of Conference:

15-18 Dec. 2009