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DK168485A - SELF-RECOGNIZING SELF-ADJUSTING CONTROL UNIT - Google Patents

SELF-RECOGNIZING SELF-ADJUSTING CONTROL UNIT Download PDF

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Publication number
DK168485A
DK168485A DK168485A DK168485A DK168485A DK 168485 A DK168485 A DK 168485A DK 168485 A DK168485 A DK 168485A DK 168485 A DK168485 A DK 168485A DK 168485 A DK168485 A DK 168485A
Authority
DK
Denmark
Prior art keywords
controller
error signal
self
peak
pid
Prior art date
Application number
DK168485A
Other languages
Danish (da)
Other versions
DK169646B1 (en
DK168485D0 (en
Inventor
Thomas W Kraus
Original Assignee
Foxboro Co
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
Priority claimed from US06/560,617 external-priority patent/US4602326A/en
Application filed by Foxboro Co filed Critical Foxboro Co
Priority to DK168485A priority Critical patent/DK169646B1/en
Publication of DK168485D0 publication Critical patent/DK168485D0/en
Publication of DK168485A publication Critical patent/DK168485A/en
Application granted granted Critical
Publication of DK169646B1 publication Critical patent/DK169646B1/en

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  • Feedback Control In General (AREA)

Abstract

A pattern-recognizing, self-tuning controller is provided for controlling a process wherein measured characteristics including at least one peak of an error signal, derived from the differences occurring over time between the values of a process-controlled variable and a desired set-point level for that variable, are used for identifying the behaviour pattern of the error signal so that an operating parameter of the controller can be changed as required to minimize process recovery time whenever the process is subsequently disturbed or an abrupt change is made to the set-point level at some later time. The preferred embodiment of the device is in the form of a proportional-integral-derivative (PID) controller in which the PID coefficients are calculated in accordance with prescribed relationships that are based on damping, overshoot and time period characteristics of the error signal. Provisions are also made for including a user-specified noise threshold in order to reduce the possibility of detecting a noise peak as a true peak of the error signal. A pre-adapt mode is also included, in which the controller automatically determines the initial values of the PID coefficients, the noise threshold, and the approximate time scale of the process, before on-line adaptive control of the process is given to the controller. <IMAGE>
DK168485A 1983-12-12 1985-04-15 Pattern-recognizing, self-tuning controllers DK169646B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK168485A DK169646B1 (en) 1983-12-12 1985-04-15 Pattern-recognizing, self-tuning controllers

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US06/560,617 US4602326A (en) 1983-12-12 1983-12-12 Pattern-recognizing self-tuning controller
US56061783 1983-12-12
DK168485 1985-04-15
DK168485A DK169646B1 (en) 1983-12-12 1985-04-15 Pattern-recognizing, self-tuning controllers

Publications (3)

Publication Number Publication Date
DK168485D0 DK168485D0 (en) 1985-04-15
DK168485A true DK168485A (en) 1986-10-16
DK169646B1 DK169646B1 (en) 1995-01-02

Family

ID=26066031

Family Applications (1)

Application Number Title Priority Date Filing Date
DK168485A DK169646B1 (en) 1983-12-12 1985-04-15 Pattern-recognizing, self-tuning controllers

Country Status (1)

Country Link
DK (1) DK169646B1 (en)

Also Published As

Publication number Publication date
DK169646B1 (en) 1995-01-02
DK168485D0 (en) 1985-04-15

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Legal Events

Date Code Title Description
B1 Patent granted (law 1993)
B1 Patent granted (law 1993)
PBP Patent lapsed

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