title: Relay-enhanced multi-loop PI controllers.
abstract: In this paper, the development of relay-enhanced multi-loop PI controllers is described for multivariable processes. The control system employs a relay in series with the controller. The relay can ensure a satisfactory level of closed-loop performance and it also yields oscillations for tuning of the PI controller based on an equivalent process model for each loop. A simulation example [on a two-inputs-two-outputs (TITO) process] is provided to illustrate the effectiveness of the proposed method and to compare its performance to an existing method.
authors.affiliation: Department of Electrical Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576.
authors.forename: K K
authors.initials: KK
authors.lastname: Tan
authors.forename: R
authors.initials: R
authors.lastname: Ferdous