Decoupled cascade control system

Details Decoupled cascade control system Decoupled cascade control system

1978-02-03

1979-04-24

Ruggiero, Joseph F.

Boots, shoes, and leggings

318561, 364108, 364116, 364118, G05B 1702

Patent

active

041515897

ABSTRACT:
Two controllers in a cascade control system are decoupled to avoid interaction by modifying the error signal to the primary controller in response to changes in the error signal to the secondary controller. The response is developed by a network which models the primary process. A signal developed from the output of the primary controller is fed forward to modify the manipulated variable. The modifying network is a model of the reciprocal of the dynamics of the secondary process. Also, the adjustment performed by the primary controller on the set point of the secondary controller is delayed in accordance with the product of the secondary process model and the reciprocal feedforward model.

REFERENCES:
patent: 3221230 (1965-11-01), Osburn
patent: 3657524 (1972-04-01), Bakke
patent: 3758762 (1973-09-01), Littman et al.
patent: 3795799 (1974-03-01), Courtiol
patent: 4054780 (1977-10-01), Bartley et al.
Liptack, "Cascade Control" - Instrument Engineers Handbook, vol. II, Chilton Book Co., New York, pp. 819-825.

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