Title: A simple self-tuning scheme using fuzzy logic for a non-linear pressure regulating system

Authors: N. Kanagaraj, P. Sivashanmugam, S. Paramasivam

Addresses: National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India. ' Department of Chemical Engineering National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India. ' ESAB Engineering Service Ltd., Chennai 600 034, Tamil Nadu, India

Abstract: A self-tuning control scheme using fuzzy logic has been studied for a pilot pressure regulating system. In this hierarchical control technique, a rule-base supervisory fuzzy system is designed to tune the input scaling factor (SF) of a direct fuzzy system according to the process condition. The proposed controller design concentrates more on improving the robustness and stability of the controller during process disturbances and changes in operating level. The proposed control scheme is implemented in an ARM7 microcontroller based embedded target board to study its applicability for real time pressure control application. The performance of the developed control scheme is compared with classical fuzzy controller under different operating level and process disturbance. Results show that the proposed self-tuning fuzzy controller outperforms the conventional method for pressure regulation.

Keywords: ARM7 microcontroller; fuzzy control; microcontroller based systems; pressure control; self-tuning control; nonlinear pressure regulation; fuzzy logic; controller design.

DOI: 10.1504/IJAAC.2010.033513

International Journal of Automation and Control, 2010 Vol.4 No.3, pp.256 - 270

Received: 01 Dec 2008
Accepted: 25 Feb 2009

Published online: 02 Jun 2010 *

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