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Title:
制御ループを用いた制御弁の操作及び診断の方法および装置
Document Type and Number:
Japanese Patent JP2007534079
Kind Code:
A
Abstract:
The present invention discloses a method of detecting faults in a control loop for a control valve (10) having a throttling element coupled to a pneumatically operated actuator (12), the control loop including a pneumatic amplifier (26) operatively coupled to the actuator (12) and having a control fluid valve assembly responsive to a control pressure signal for controlling flow of control fluid to the actuator, and an I/P converter (24) operatively coupled to the pneumatic amplifier (26) for generating the control pressure signal in response to an I/P drive signal, wherein the I/P drive signal is based on a reference outlet pressure signal, the method comprising: storing a normal range for a control parameter of the control loop; triggering a fault signal for operation of the control parameter outside the normal range; characterizing operating parameters of the control loop during the fault signal to derive a fault template; comparing the fault template to sets of stored operating parameters associated with specific component failures; and identifying at least one specific component failure having a set of stored operating parameters that matches the fault template.

Inventors:
Junk, Kenneth W.
Ratwesen, Annette El.
Application Number:
JP2007509467A
Publication Date:
November 22, 2007
Filing Date:
March 15, 2005
Export Citation:
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Assignee:
Fisher Controls International Limited Liability Company
International Classes:
G05D7/06; F15B5/00; F15B9/07; F15B13/04; F15B13/043; F15B19/00; G05D7/00; G05D16/20
Domestic Patent References:
JPH07139504A1995-05-30
JPH09210858A1997-08-15
JPS59221407A1984-12-13
JPH07139504A1995-05-30
Foreign References:
WO2003093681A12003-11-13
WO2003093681A12003-11-13
Attorney, Agent or Firm:
Yoshihiro Tsunoda