A process-model control for linear systems with delay

Control of integrating process with dead time using auto-tuning approach

“…In Watanabe's method (Watanabe and Ito, 1981), the response for the set point and load disturbance rejection were better for the PID controller than the PI controller. The set point response was rather slow.…”

“…To overcome the drawback of the DTC discussed previously, Watanabe and Ito (1981) Watanabe and Ito (1981) Simulation studies have shown that, with a PI controller the set point and load disturbances were either very oscillatory or highly damped when the process had a large dead-time. The response of the system also tends to be slow.…”

A reference guide to Smith predictor based methods for the compensation of dead-time processes

“…If the disturbance is not of step form, then the optimal controller may be specified for regulator applications by the inclusion of an appropriate dynamic element in the feedback path of the Smith predictor structure [24][25][26][27][28][29][30][31][32][33][34][35][36]. The Smith predictor may also be related to other delay compensator strategies [37][38][39][40][41][42][43][44][45].…”

“…Modifications of the Smith predictor have been discussed to improve the regulator properties of the compensated system and/or the performance of the compensated system in the presence of measurement noise and process parameter variations [17,25,31,32,64,80,95,114,. Some authors, for example, suggest that improved responses may be obtained if appropriate dynamic terms are included in either the outer feedback loop or the inner feedback loop (e.g.…”

Robust tuning procedures of dead-time compensating controllers

“…The extension of the Smith predictor to the unstable plant case was first presented in [Watanabe and Ito, 1981]. The compensator used here is the Figure 10 The improved dead-time compensating controller for integrating processes.…”