JPS6464001A - Controller - Google Patents

Controller

Info

Publication number
JPS6464001A
JPS6464001A JP22020587A JP22020587A JPS6464001A JP S6464001 A JPS6464001 A JP S6464001A JP 22020587 A JP22020587 A JP 22020587A JP 22020587 A JP22020587 A JP 22020587A JP S6464001 A JPS6464001 A JP S6464001A
Authority
JP
Japan
Prior art keywords
control
signal
lifetime
given
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP22020587A
Other languages
Japanese (ja)
Inventor
Seiitsu Nikawara
Satoshi Kusaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP22020587A priority Critical patent/JPS6464001A/en
Publication of JPS6464001A publication Critical patent/JPS6464001A/en
Pending legal-status Critical Current

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  • Feedback Control In General (AREA)

Abstract

PURPOSE:To properly control of the lifetime of a control valve serving as a control terminal by adding a limiting circuit to limit the controlled variable of the control terminal. CONSTITUTION:A valve minimum opening limiting circuit 7 is set between a control part 6 and a control signal output part 8. A target control signal D3 is calculated as an input by a control part 6 based on the actual difference value between the process value (value to be controlled) 2 and the target value 1. Then the proper correction is applied to the signal D3 in accordance with the cases that the serious consideration is given to the controllability or to the lifetime of a control valve serving as a control terminal. Thus a control signal D'4 is outputted. In other words, the limit range is reduced for output of the signal D3 when the preference is given to the controllability. While said limit range is increased when the preference is given to the lifetime of the control valve.
JP22020587A 1987-09-04 1987-09-04 Controller Pending JPS6464001A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22020587A JPS6464001A (en) 1987-09-04 1987-09-04 Controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22020587A JPS6464001A (en) 1987-09-04 1987-09-04 Controller

Publications (1)

Publication Number Publication Date
JPS6464001A true JPS6464001A (en) 1989-03-09

Family

ID=16747534

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22020587A Pending JPS6464001A (en) 1987-09-04 1987-09-04 Controller

Country Status (1)

Country Link
JP (1) JPS6464001A (en)

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