Apparatus for relay based multiple point process frequency response estimation and control tuning
US6438431B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1998 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Aug 12, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B13/042
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Briefly, a preferred embodiment of the present invention includes an apparatus for tuning a regulator in a process controller. The digitized output from a standard relay and a parasitic relay are fed through digital to analog converter providing signals at 0.5&ohgr;c, &ohgr;c and 1.5&ohgr;c to the process, where &ohgr;c is the process critical frequency. The apparatus records the digitized relay output u′ and the digitized process output y′ until stationary oscillations are reached. The outputs u′ and y′ are then used to calculate the process frequency response at 0.50&ohgr;c, &ohgr;c and 1.5&ohgr;c. This data is then used to design the regulator, the output of which is converted to analog form and inputted to control the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.