Fuzzy Coordinated PI Controller: Application to the Real‐Time Pressure Control Process

Abstract

Recommended by Yousef Al-AssafThis 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.

A Mamdani-type fuzzy gain adapter for PID controller on a thermal system using PLC

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“…Each membership function of a fuzzy variable is assigned with an abbreviated linguistic value-like MED (medium), VHIG (very high), and so on. [1] The membership function is formed to convert the degree of fuzziness into the normalized interval (0, 1). The triangle membership functions [1] are selected for the inputs and outputs and its degree of fuzziness is expressed as in eqn.…”

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“…PI-FLC's are most common as Proportional (P) and Integral (I) actions are combined in the Proportional Integral (PI) controller which combines the advantages of inherent stability of proportional controller and the offset elimination by integral controller (Mudi and Pal, 2001). Also the performance and tuning of PI controllers for industrial processes is well known among all industrial operators (Kanagaraj et al, 2008). However tuning of PI controller requires an accurate model of a process and effective design rules (Bai et al, 2008).…”