Fuzzy coordinated PI controller: application to the real-time pressure control process

Authors:
N. Kanagaraj;P. Sivashanmugam;S. Paramasivam
Affiliations:
Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India;Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India;ESAB Engineering Service Ltd., Chennai, Tamil Nadu, India
Venue:
Advances in Fuzzy Systems - Regular issue
Year:
2008

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Abstract

This paper presents the real-time implementation of a fuzzy coordinated classical PI control scheme for controlling the pressure in a pilot pressure tank system. The fuzzy system has been designed to track the variation parameters in a feedback loop and tune the classical controller to achieve a better control action for load disturbances and set point changes. The error and process inputs are chosen as the inputs of fuzzy system to tune the conventional PI controller according to the process condition. This online conventional controller tuning technique will reduce the human involvement in controller tuning and increase the operating range of the conventional controller. The proposed control algorithm is experimentally implemented for the real-time pressure control of a pilot air tank system and validated using a high-speed 32-bit ARM7 embedded microcontroller board (ATMEL AT91M55800A). To demonstrate the performance of the fuzzy coordinated PI control scheme, results are compared with a classical PI and PI-type fuzzy control method. It is observed that the proposed controller structure is able to quickly track the parameter variation and perform better in load disturbances and also for set point changes.