Title: An adaptive PID control algorithm for nonlinear process with uncertain dynamics

Authors: A.S. Wincy Pon Annal; S. Kanthalakshmi

Addresses: Department of Electronics and Instrumentation Engineering, Government College of Technology, Coimbatore, Tamilnadu, India ' Department of Instrumentation and Control Systems Engineering, PSG College of Technology, Coimbatore, Tamilnadu, India

Abstract: The control objective is to maintain level in a conical tank which is a highly nonlinear process having varying dynamics. The classical PID control scheme finds it difficult to implement a proper control action when process switches between operating regions. Hence dynamic set of controller parameters are required to enhance the performance of the controller. Eventually this leads to drifting of controller parameters which makes stability a critical phenomenon. Hence an adaptive algorithm which updates the controller parameters automatically based on the operating conditions is required. In this paper, this task is achieved with an adaptive controller where adaptation is done with the help of fuzzy rule-base.

Keywords: conical tank; classical PID controller; fuzzy controller; disturbance rejection; servo tracking.

DOI: 10.1504/IJAAC.2017.084867

International Journal of Automation and Control, 2017 Vol.11 No.3, pp.262 - 273

Received: 23 Jun 2016
Accepted: 28 Aug 2016

Published online: 23 Mar 2017 *

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