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Title: Closed-loop automatic tuning of PID controller for nonlinear systems
Authors: Tan, K.K. 
Ferdous, R.
Huang, S. 
Keywords: Automatic tuning
Least squares estimation
Nonlinear systems
PID control
Robust performance
Issue Date: Aug-2002
Citation: Tan, K.K., Ferdous, R., Huang, S. (2002-08). Closed-loop automatic tuning of PID controller for nonlinear systems. Chemical Engineering Science 57 (15) : 3005-3011. ScholarBank@NUS Repository.
Abstract: In this paper, a robust control system is first proposed which is suitable for the control of a class of nonlinear systems. A parallel connection of a relay to a proportional integral derivative (PID) controller collectively forms the robust controller. The relay ensures robust control by providing a high feedback gain, but it also induces a control chattering phenomenon. Instead of viewing chattering as an undesirable yet inevitable feature, the chattering signals are used as natural excitation signals for identifying an equivalent PID controller using the recursive least squares algorithm. No other explicit input signal is required. Analysis is provided on the stability properties of the control scheme. Simulation results for the level control of fluid in a spherical tank using the scheme are presented. © 2002 Elsevier Science Ltd. All rights reserved.
Source Title: Chemical Engineering Science
ISSN: 00092509
DOI: 10.1016/S0009-2509(02)00186-0
Appears in Collections:Staff Publications

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