Digital control system

Electricity: motive power systems – Positional servo systems – 'reset' systems

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Details

318609, 318561, 364161, 364162, 364163, G05B 1142

Patent

active

050598805

ABSTRACT:
A digital controller comprising a deviation calculator, a positional P-controlling calculation device, a velocity-type I-controlling calculation device, a signal converter, and an adder unit. The deviation calculator for subtracts a process variable of an object from a set point variable, to obtain a deviation. The positional P-controlling calculation device performs positional P-calculation on the deviation obtained by the deviation calculator. The velocity-type I-controlling calculation device performs velocity-type I-calculation on the deviation. The signal-converting device converts the velocity-type I-calculation output of the velocity-type I-controlling algorithm device, into a positional I-signal. The adder unit adds the positional I-signal obtained by the signal-converting device and the positional P-calculation output obtained by the positional P-controlling algorithm device, thereby obtaining a manipulative variable. The manipulative variable value is supplied to the object to control the object.

REFERENCES:
patent: 3582629 (1968-08-01), Ross
patent: 3770946 (1973-11-01), Fertik et al.
patent: 4418381 (1983-11-01), Molusis et al.
patent: 4727303 (1988-02-01), Morse et al.
"Microprocessors in Instruments and Control", Chapter 6, Velocity Algorithm, Robert J. Bibbero, 1977.
"Distillation Columns An ISA Monograph", Chapter 8, Velocity--Control Algorithm, A. Eli Nisenfeld et al, 1981, Instrument Society of America, pp. 204-206.
The Basis and Application of the Digital Instrumentation Control System, Kazuo Hiroi, Ind. Technology Corp. (1987), pp. 90-95.

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