Title:
プロセス制御ループにおける不安定性の検出および識別
Document Type and Number:
Japanese Patent JP4944361
Kind Code:
B2
Abstract:
A method and apparatus determines the presence of and source of instabilities, such as limit cycles, within a process control loop while the process control loop operates on-line within a process environment. The method and apparatus measures one or more signals within a process control loop when the process control loop is connected on-line within a process control environment, stores the measured signal as signal data and then performs one or more statistical analyses on the stored signal data to determine whether instabilities exist and, if so, whether the source of an instability is within a servo loop or outside of a servo loop and is due to friction, external forces or mechanical anomalies.
Inventors:
Junk, Kenneth W.
Application Number:
JP2003555289A
Publication Date:
May 30, 2012
Filing Date:
October 15, 2002
Export Citation:
Assignee:
Fisher Controls International Limited Liability Company
International Classes:
G05B13/02; G05B5/01; G05B23/02
Domestic Patent References:
| JP5969813A | ||||
| JP44602B2 | ||||
| JP5522807U | ||||
| JP6129882A | ||||
| JP2000214052A | ||||
| JP64789A | ||||
| JP62210503A | ||||
| JP58168106A | ||||
| JP6162108A | ||||
| JP472121A |
Foreign References:
| US4885676 |
Attorney, Agent or Firm:
Patent business corporation Yuko patent office