Process control

Details Process control Process control

1980-03-11

1982-08-24

Ruggiero, Joseph F.

Boots, shoes, and leggings

318561, 318610, 318621, 364149, 364152, 364157, 364177, G06G 766, G05B 1142, G05B 1304

Patent

active

043464335

ABSTRACT:
A process control system is provided in which a process variable is compared to a set point for the process variable by a process controller with the results of the comparison being utilized to control the process in such a manner that the process variable will be substantially equal to the set point for the process variable. A critically damped response of the process variable to a change in the set point is achieved by utilizing a process controller which has the characteristics of a proportional-integral-derivative controller followed by a first order lag. Tuning of the process controller is accomplished by changing a time constant which is common to the proportional, integral and derivative terms of the proportional-integral-derivative controller and also common to the first order lag.

REFERENCES:
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patent: 3552428 (1971-01-01), Pemberton
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patent: 3741474 (1973-06-01), Kawada et al.
patent: 3826887 (1974-07-01), Pemberton
patent: 3925640 (1975-12-01), Duggan
patent: 4069413 (1978-01-01), Rutledge et al.
patent: 4195337 (1980-03-01), Bertrano et al.
patent: 4214300 (1980-07-01), Barlow et al.

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