Design of local linear models using PID Tuning According to error

PID control is widely used in process systems represented by chemical processes and petroleum refining processes. The reason is that PID control has a simple structure. However, most of the existing systems are non-linear systems, and it is difficult to always obtain good control results with fixed PID control. Therefore, in this study, we propose a method of tuning the PID gain according to the deviation (control error) of the control result, and verify the effectiveness of this method through experiments. For self-tuning PID control using a local linear model, we propose a program that performs PID tuning only when the deviation occurs with a certain magnitude. A simulation is performed on the Hammerstein model, which is a non-linear system. As a result of the experiment, the number of PID gain changes could be significantly reduced. (c) 2022 The Author. Published by Sugisaka Masanori at ALife Robotics Corporation Ltd. This is an open access article distributed under the CC BY-NC 4.0 license (http://creativecommons.org/licenses/by-nc/4.0/).