Anti-reset windup proportional and integral controller
US3938017A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1974 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Mar 5, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D16/202
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.