The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 2022
Filed:
Aug. 30, 2017
Korea Hydro & Nuclear Power Co., Ltd, Gyeongsangbuk-do, KR;
Yang Seok Kim, Daejeon, KR;
Dae Woong Kim, Sejong, KR;
Bum Nyun Kim, Gyeongsangbuk-do, KR;
Young Sheop Park, Sejong, KR;
Chi Yong Park, Daejeon, KR;
Jong Seog Kim, Daejeon, KR;
Hyoung Kyun Kim, Daejeon, KR;
Byoung Oh Lee, Daejeon, KR;
Ji In Kim, Seoul, KR;
Nam Woo Choi, Gyeonggi-do, KR;
Yong Hoon Park, Gyeongsangbuk-do, KR;
Hee Seung Chang, Daejeon, KR;
You Soo Shin, Gyeongsangbuk-do, KR;
KOREA HYDRO & NUCLEAR POWER CO., LTD, Gyeongsangbuk-do, KR;
Abstract
Method for diagnosing a pneumatic control valve by using a positioner model includes: establishing relational expression for outputting valve stem displacement according to control pressure, the relational expression including parameters for the characteristics of a positioner, an actuator, and a valve, determining initial parameter value by adjusting the values of the parameters until the difference between a measured value for a normal operation of the pneumatic control valve and output value obtained by the relational expression is smaller than predetermined error limit, determining diagnostic parameter value by adjusting the values of the parameters until the difference between a measured value for a diagnostic operation of the pneumatic control valve and an output value obtained by the relational expression is smaller than a predetermined error limit, and comparing the initial parameter value and the diagnostic parameter value so as to determine whether the pneumatic control valve has abnormality.