Relay Autotuning for Identification and Control

Proportional-integral-derivative (PID) controllers are extensively used for efficient industrial operations. Autotuning such controllers is required for efficient operation. There are two ways of relay autotuning cascade control systems – simultaneous tuning and sequential tuning. This book discusses incorporation of higher order harmonics of relay autotuning for a single loop controller and cascade control systems to get accurate values of controller ultimate gain. It provides a simple method of designing P/PI controllers for series and parallel cascade control schemes. The authors also focus on estimation of model parameters of unstable FOPTD systems, stable SOPTD and unstable SOPTDZ systems using a single relay feedback test. The methodology and final results explained in this book are useful in tuning controllers. The text would be of use to graduate students and researchers for further studies in this area.

Dr M. Chidambaram has authored three books and published 165 research papers in journals in the field of process control. He served as Director, National Institute of Technology, Tiruchirappalli during the period 2005–2010. He is presently working as a Professor, Department of Chemical Engineering, Indian Institute of Technology, Madras.

Dr Vivek Sathe received his PhD from the Indian Institute of Technology, Madras, and is presently working as Professor in the Department of Chemical Engineering, Dr Babasaheb Ambedkar Technological University, Lonere, Maharashtra. He has 18 years of teaching experience. He has published nearly 100 articles in national and international journals. His research interests are feedback control systems, relay tuning, control theory and modeling.