Adaptive Control for Nonlinear Systems with Time-Varying Control Gain. (6th June 2012)

• Record Type: Journal Article
• Authors: Rincon, Alejandro; Angulo, Fabiola
• Other Names: Cao Chengyu Academic Editor.
• Is Part Of: Journal of control science and engineering. Volume 2012(2012)
• Publication Date: 2012-06-06
• Subjects: Control theory -- Periodicals; 629.831205
• DOI: 10.1155/2012/269346
• Languages: English
• ISSNs: 1687-5249

Abstract

Abstract : We propose a scheme for nonlinear plants with time-varying control gain and time-varying plant coefficients, on the basis of a plant model consisting of a Brunovsky-type model with polynomials as approximators. We develop an adaptive robust control scheme for this plant, under the following assumptions: (i) the plant terms involve time-varying but bounded coefficients, being its upper bound unknown; (ii) the control gain is unknown, not necessarily bounded, and only its signum is known. To achieve robustness, we use a combination of robustifying control inputs and dead zone-type update laws. We apply this methodology to the speed control of a permanent magnet synchronous motor (PMSM), and we achieve proper tracking results.