Online SOPDT Model Identification Method Using a Relay

This paper describes a novel method for the online identification of an analog second-order plus dead time (SOPDT) model. It requires measurement four physical quantities, which relay is used. Based on these measurements, parameters model or regulator settings can be directly determined and used to autotune PI/PID controllers. The steps required take necessary measurements computational algorithms determine are presented. results simulation studies, including calculations obtained models, presented demonstrate effectiveness proposed method. Comparisons were made between developed SOPDT critically damped that often high-order inertial plants.