期刊
JOURNAL OF PROCESS CONTROL
卷 22, 期 1, 页码 296-302出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jprocont.2011.07.007
关键词
State estimation; Unknown input reconstruction; Observer matching condition; Auxiliary outputs; Sliding mode observers
资金
- National Nature Science Foundation of China [61074009]
- Shanghai Leading Academic Discipline Project [B004]
This paper considers the problems of the simultaneous estimation of the system states and the unknown inputs for linear systems when the so-called observer matching condition is not satisfied. An auxiliary output vector is introduced so that the observer matching condition is satisfied with respect to it. A high-order sliding mode observer is considered to get the exact estimates of both the auxiliary outputs and their derivatives in a finite time based on the system measured outputs. After this, a reduced-order observer is constructed by using the estimated auxiliary outputs as the new system outputs. The reduced-order observer is able to asymptotically estimate the system states without suffering the influence of the unknown inputs. A kind of unknown input reconstruction method based on both the state and the auxiliary output derivative estimates is developed. Finally, a numerical simulation example is given to illustrate the effectiveness of the proposed methods. (C) 2011 Elsevier Ltd. All rights reserved.
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