Title:
VALVE POSITIONER
Document Type and Number:
Japanese Patent JP2015040569
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a valve positioner capable of obtaining sufficient response even when a characteristic of a valve varies.SOLUTION: A valve positioner having an auto-tuning function 7 for determining a control parameter of a valve 5 comprises: parameter table creation means for creating a parameter table with a control parameter after auto-tuning as a reference; a memory for storing the parameter table created by the parameter table creation means; response change observation means 9 for observing response change of the valve 5; and parameter selection means 10 for estimating a state of a packing of the valve 5 on the basis of observing results of the response change observation means, and selecting a proper control parameter from the parameter table stored in the memory to set it to the valve 5.
Inventors:
MURAKAMI TATSUHIRO
Application Number:
JP2013170180A
Publication Date:
March 02, 2015
Filing Date:
August 20, 2013
Export Citation:
Assignee:
YOKOGAWA ELECTRIC CORP
International Classes:
F15B9/08; G05B11/36; G05B13/02