Barrier Lyapunov Functions for the control of output-constrained nonlinear systems

Authors:
Keng Peng Tee;Shuzhi Sam Ge;Eng Hock Tay
Affiliations:
Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore and Institute for Infocomm Research, Agency for Science, Research and Technology (A ...;Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore;Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore
Venue:
Automatica (Journal of IFAC)
Year:
2009

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Abstract

In this paper, we present control designs for single-input single-output (SISO) nonlinear systems in strict feedback form with an output constraint. To prevent constraint violation, we employ a Barrier Lyapunov Function, which grows to infinity when its arguments approach some limits. By ensuring boundedness of the Barrier Lyapunov Function in the closed loop, we ensure that those limits are not transgressed. Besides the nominal case where full knowledge of the plant is available, we also tackle scenarios wherein parametric uncertainties are present. Asymptotic tracking is achieved without violation of the constraint, and all closed loop signals remain bounded, under a mild condition on the initial output. Furthermore, we explore the use of an Asymmetric Barrier Lyapunov Function as a generalized approach that relaxes the requirements on the initial conditions. We also compare our control with one that is based on a Quadratic Lyapunov Function, and we show that our control requires less restrictive initial conditions. A numerical example is provided to illustrate the performance of the proposed control.