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A simple algorithm for the time-optimal control of chemical processes

✍ Scribed by John N. Beard Jr.; Frank R. Groves Jr.; Adrain E. Johnson Jr.

Publisher: American Institute of Chemical Engineers
Year: 1974
Tongue: English
Weight: 668 KB
Volume: 20
Category: Article
ISSN: 0001-1541
DOI: 10.1002/aic.690200117

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✦ Synopsis

Abstract

A simple algorithm for the time‐optimal control of chemical processes during setpoint changes, in processes which can be described by a second‐order lag plus dead time model, is described. Knowledge of the unsteady state model parameters is not required because the algorithm uses a dimensionless phase plane on which the switching curves are independent of system parameters for a given forcing function. The algorithm gives the parameters of a second‐order lag plus dead time model as a by product of the setpoint change. It is easily tuned and is relatively insensitive to changes in the process dynamics. The algorithm does not require a large computer or long computing times and has been implemented on both analog and digital computers in controlling computer simulated systems.

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