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		Yun ZHANG,Yungang LIU,Yuqin DING.[en_title][J].Control Theory and Technology,2006,4(4):372~378.[Copy]

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YunZHANG,YungangLIU,YuqinDING
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Received:August 08, 2005Revised:June 22, 2006

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A new nonlinear output tracking controller via output-feedback

Yun ZHANG, Yungang LIU, Yuqin DING

(School of Control Science and Engineering, Shandong University, Jinan Shandong 250061, China.)

Abstract:

In this paper, the output tracking control is investigated for a class of nonlinear systems when only output is available for feedback. Based on the multivariable analog of circle criterion, an observer is first introduced. Then, the observer-based output tracking controller is constructively designed by using the integral backstepping approach together with completing square. It is shown that, under relatively mild conditions, all the closed-loop signals are uniformly bounded. Meanwhile the system output asymptotically tracks the desired output. A simulation example is given to illustrate the effectiveness of the theoretical results.

Key words: Nonlinear systems Multivariable analog of circle criterion Output tracking control Output-feedback Integral backstepping approach