Estimation of Orders and Delay-time of the Process in Closed-Loop Control System

Abstract

This paper proposes a procedure of estimating orders and delay-time of the process in closed-loop control system. There are identifiability conditions which assure uniqueness and undiasedness of estimates, but they are not available in practice. Because they require the orders and delay-time, which are practically unknown. Therefore, it is primary to estimate the orders and and delay-time of the process in identification of closed-loop system. In this paper, the authors first investigate the influence caused by the closed-loop on the identification, and then, propose the procedure of estimating orders and delay-time taking account of the consiquence that they have in their work.