A New Method of Stabilizing Control Systems with Large Dead Time

Abstract

A control system with large dead time is often found in industrial processes or in some kind of rolling works. Such loops are difficult to stabilize with the conventional controllers. The author presents a new method to stabilize such systems by introducing two kinds of feedback signals ; a signal obtained from system output and a signal from system intermediate point having no dead time effect. This paper shows the merits of the author's method by analytical frequency response calculations, analog computer responses and experimental results in a two-pass heat exchanger with large dead time.