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 JP5268357
Kind Code:
B2
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.
Ratwesen, Annette El.
Application Number:
JP2007509467A
Publication Date:
August 21, 2013
Filing Date:
March 15, 2005
Export Citation:
Assignee:
Fisher Controls International Limited Liability Company
International Classes:
G05D7/06; F15B5/00; F15B9/07; F15B13/04; F15B13/043; F15B19/00; G05B23/02; G05D7/00; G05D16/20
Domestic Patent References:
| JP59221407A | ||||
| JP9210858A | ||||
| JP7139504A |
Foreign References:
| WO2003093681A1 |
Attorney, Agent or Firm:
Yoshihiro Tsunoda