Event-triggered controller via adaptive output-feedback for a class of uncertain nonlinear systems

• Published in: International journal of control Vol. 94; no. 9; pp. 2575 - 2583
• Main Authors: Li, Hui, Liu, Yungang, Huang, Yaxin
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 02.09.2021; Taylor & Francis Ltd
• Subjects: Adaptive control; adaptive technique; Event triggered control; Feedback control; global output-feedback stabilisation; High gain; large uncertainties; Nonlinear systems; Output feedback
• ISSN: 0020-7179; 1366-5820
• DOI: 10.1080/00207179.2020.1718771

This paper addresses the global stabilisation via adaptive event-triggered output-feedback for a class of uncertain nonlinear systems. Remarkably, the systems under investigation simultaneously allow large uncertainties and linearly unmeasured states dependent growth for the first time in the event-triggered framework, for which a dynamic high gain and an observer based on the high gain are introduced. By integrating compensation and time-varying strategies, an adaptive event-triggered output-feedback controller is established. Particularly, a new event-triggering mechanism is introduced, in which the time-varying threshold (strictly positive and gradually decaying) is key to ensure the validity of the event-triggered controller and achieve the convergence. A simulation example is given to illustrate the effectiveness of the proposed approach.