Design and Implementation of a Discrete-Time Proportional Integral (PI) Controller for the Temperature Control of a Heating Pad

作     者：Khan, Pathan Fayaz Sengottuvel, S. Patel, Rajesh Gireesan, K. Baskaran, R. Mani, Awadhesh 

作者机构：Homi Bhabha Natl Inst Indira Gandhi Ctr Atom Res Condensed Matter Phys Div Mat Sci Grp Kalpakkam Tamil Nadu India 

出 版 物：《SLAS TECHNOLOGY》 (实验室自动化协会杂志)

年 卷 期：2018年第23卷第6期

页      面：614-623页

核心收录：

学科分类：0710[理学-生物学] 12[管理学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 08[工学] 0703[理学-化学] 

基　　金：The authors would like to thank Mr. Mohammed Danish  BE (Hons.)  BITS  Pilani  for his valuable assistance during the hardware design of the controller. It is a pleasure to thank Dr. N. V. Chandra Shekar  Head  Condensed Matter Physics Division  and Dr. G. Amarendra  Director  Materials Science Group  Indira Gandhi Centre for Atomic Research  for their encouragement and support. The authors would also like to thank Mr. M. P. Janawadkar and Dr. T. S. Radhakrishnan for their suggestions for improving the manuscript. The authors received no financial support for the research  authorship  and/or publication of this article 

主　　题：PI controller Arduino microcontroller CHEPS system identification 

摘      要：Contact heat evoked potentials (CHEPs) are recorded from the brain by giving thermal stimulations through heating pads kept on the surface of the skin. CHEP signals have crucial diagnostic implications in human pain activation studies. This work proposes a novel design of a digital proportional integral (PI) controller based on Arduino microcontroller with a view to explore the suitability of an electric heating pad for use as a thermode in a custom-made, cost-effective CHEP stimulator. The purpose of PI controller is to set, regulate, and deliver desired temperatures on the surface of the heating pad in a user-defined pattern. The transfer function of the heating system has been deduced using the parametric system identification method, and the design parameters of the controller have been identified using the root locus technique. The efficiency of the proposed PI controller in circumventing the well-known integrator windup problem (error in the integral term builds excessively, leading to large transients in the controller output) in tracking the reference input and the controller effort (CE) in rejecting output disturbances to maintain the set temperature of the heating pad have been found to be superior compared with the conventional PI controller and two of the existing anti-windup models.