Anti-reset windup proportional and integral controller

Details Anti-reset windup proportional and integral controller Anti-reset windup proportional and integral controller

1974-03-05

1976-02-10

Wayner, William E.

Electricity: motive power systems

Positional servo systems

'reset' systems

236 78D, G05B 1142

Patent

active

039380173

ABSTRACT:
An anti-reset windup proportional plus integral controller connectable in a proportional control loop of a process control system includes a proportional amplifier circuit and an integrating amplifier circuit responsive to a command signal to provide proportional and integral signals, respectively, which are summed by a summing amplifier to provide a modified command signal having a proportional and an integral component. A signal comparator means compares the modified command with a pair of reference signals which define an output range for said summing amplifier and disables the integrating amplifier circuit, permitting the integrating amplifier circuit to unwind whenever the modified command signal is not within the output range.

REFERENCES:
patent: 2668264 (1954-02-01), Williams, Jr.
patent: 3221257 (1965-11-01), Ohlson
patent: 3391317 (1968-07-01), Bell
patent: 3819999 (1974-06-01), Platt

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