Title:
ポジショナ
Document Type and Number:
Japanese Patent JP6671202
Kind Code:
B2
Abstract:
A positioner according to the present invention includes: an electro-pneumatic converter that converts an input electric signal into a pneumatic signal and controls the valve opening of a regulating valve by driving an operational unit in accordance with the pneumatic signal; an operating-point searching unit that changes the electric signal by performing open loop control to search for an operating point indicating a target valve-opening value of the regulating valve when an output air pressure of the pneumatic signal starts to change; and a PST executing unit that executes a PST on the regulating valve by using the operating point found by the operating-point searching unit. The operating-point searching unit sets the operating point based on a value of the electric signal when the output air pressure matches a first reference value.
Inventors:
Takashi Nomiyama
Application Number:
JP2016058384A
Publication Date:
March 25, 2020
Filing Date:
March 23, 2016
Export Citation:
Assignee:
Azbil Co., Ltd.
International Classes:
F15B9/08; G05D7/06
Domestic Patent References:
| JP2002039106A | ||||
| JP2013053652A | ||||
| JP2001280301A | ||||
| JP10030603A | ||||
| JP2011214611A | ||||
| JP11230401A | ||||
| JP2003343503A |
Foreign References:
| WO2015171843A2 | ||||
| US6155283 | ||||
| US6745084 |
Attorney, Agent or Firm:
Shigeki Yamakawa
Masaki Yamakawa
Masaki Yamakawa