Title:
AUTO-TUNING PID CONTROL FOR VACUUM SYSTEM
Document Type and Number:
WIPO Patent Application WO2004019144
Kind Code:
A3
Abstract:
A PID controller tuning method that accounts for system noise comprises identifying the system noise (3b), calculating thresholds (3c) outside of and an ultimate period (UP). Using an average of a process variable (PV), a maximum noise level (MNL) can be calculated as a maximum difference between the PV and the average. A first threshold is calculated as the sum of a set-point (SP) and the MNL. When a first control output (CO) is generated, the PV moves toward the first threshold. As soon as the PV crosses the second threshold, the first CO is generated. Alternating between the first CO and the second CO allows the UG and the UP to be ascertained (3d).
More Like This:
| JPS5734214 | TEMPERATURE CONTROLLER |
| JPS54105680 | DEVICE FOR CONTROLLING CHARGING OF CHEMICAL |
| JP3875112 | REGULATOR WITH PID SELECTION FUNCTION |
Inventors:
MEYER RICK (US)
Application Number:
PCT/US2003/006120
Publication Date:
May 21, 2004
Filing Date:
February 25, 2003
Export Citation:
Assignee:
DELAVAL HOLDING AB (SE)
MEYER RICK (US)
MEYER RICK (US)
International Classes:
G05B11/42; G05B13/02; (IPC1-7): A01J5/04
Foreign References:
| US5587899A | 1996-12-24 | |||
| US4881160A | 1989-11-14 | |||
| US5609136A | 1997-03-11 | |||
| US5453925A | 1995-09-26 | |||
| US6164242A | 2000-12-26 | |||
| US5845599A | 1998-12-08 | |||
| US4441151A | 1984-04-03 | |||
| US4549123A | 1985-10-22 |
Download PDF: