WO2004019144A3 - Auto-tuning pid control for vacuum system - Google Patents

Auto-tuning pid control for vacuum system Download PDF

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Publication number
WO2004019144A3
WO2004019144A3 PCT/US2003/006120 US0306120W WO2004019144A3 WO 2004019144 A3 WO2004019144 A3 WO 2004019144A3 US 0306120 W US0306120 W US 0306120W WO 2004019144 A3 WO2004019144 A3 WO 2004019144A3
Authority
WO
WIPO (PCT)
Prior art keywords
threshold
auto
vacuum system
pid control
mnl
Prior art date
Application number
PCT/US2003/006120
Other languages
French (fr)
Other versions
WO2004019144A2 (en
Inventor
Rick Meyer
Original Assignee
Delaval Holding Ab
Rick Meyer
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 Delaval Holding Ab, Rick Meyer filed Critical Delaval Holding Ab
Priority to AU2003213620A priority Critical patent/AU2003213620A1/en
Publication of WO2004019144A2 publication Critical patent/WO2004019144A2/en
Publication of WO2004019144A3 publication Critical patent/WO2004019144A3/en

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/0205—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric not using a model or a simulator of the controlled system
    • G05B13/024—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric not using a model or a simulator of the controlled system in which a parameter or coefficient is automatically adjusted to optimise the performance
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
    • G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.

Abstract

A PID controller tuning method that accounts for system noise comprises identifying the system noise (3b), calculating thresholds (3c) outside of and an ultimate period (UP). Using an average of a process variable (PV), a maximum noise level (MNL) can be calculated as a maximum difference between the PV and the average. A first threshold is calculated as the sum of a set-point (SP) and the MNL. When a first control output (CO) is generated, the PV moves toward the first threshold. As soon as the PV crosses the second threshold, the first CO is generated. Alternating between the first CO and the second CO allows the UG and the UP to be ascertained (3d).
PCT/US2003/006120 2002-08-20 2003-02-25 Auto-tuning pid control for vacuum system WO2004019144A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003213620A AU2003213620A1 (en) 2002-08-20 2003-02-25 Auto-tuning pid control for vacuum system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40484802P 2002-08-20 2002-08-20
US60/404,848 2002-08-20

Publications (2)

Publication Number Publication Date
WO2004019144A2 WO2004019144A2 (en) 2004-03-04
WO2004019144A3 true WO2004019144A3 (en) 2004-05-21

Family

ID=31946771

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/006120 WO2004019144A2 (en) 2002-08-20 2003-02-25 Auto-tuning pid control for vacuum system

Country Status (2)

Country Link
AU (1) AU2003213620A1 (en)
WO (1) WO2004019144A2 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4441151A (en) * 1977-11-04 1984-04-03 Toyo Systems, Ltd. Apparatus for tuning PID controllers in process control systems
US4549123A (en) * 1981-08-24 1985-10-22 Naf Controls Ab Method and an apparatus in tuning a PID-regulator
US4881160A (en) * 1987-03-09 1989-11-14 Yokogawa Electric Corporation Self-tuning controller
US5453925A (en) * 1993-05-28 1995-09-26 Fisher Controls International, Inc. System and method for automatically tuning a process controller
US5587899A (en) * 1994-06-10 1996-12-24 Fisher-Rosemount Systems, Inc. Method and apparatus for determining the ultimate gain and ultimate period of a controlled process
US5609136A (en) * 1994-06-28 1997-03-11 Cummins Engine Company, Inc. Model predictive control for HPI closed-loop fuel pressure control system
US5845599A (en) * 1997-02-10 1998-12-08 Smartenergy Services, Inc. Vacuum controller and method of controlling vacuum in a dairy milking systems
US6164242A (en) * 1995-06-26 2000-12-26 Alfa Laval Agri Ab Method of regulating the vacuum level in a milking apparatus, and a milking apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4441151A (en) * 1977-11-04 1984-04-03 Toyo Systems, Ltd. Apparatus for tuning PID controllers in process control systems
US4549123A (en) * 1981-08-24 1985-10-22 Naf Controls Ab Method and an apparatus in tuning a PID-regulator
US4881160A (en) * 1987-03-09 1989-11-14 Yokogawa Electric Corporation Self-tuning controller
US5453925A (en) * 1993-05-28 1995-09-26 Fisher Controls International, Inc. System and method for automatically tuning a process controller
US5587899A (en) * 1994-06-10 1996-12-24 Fisher-Rosemount Systems, Inc. Method and apparatus for determining the ultimate gain and ultimate period of a controlled process
US5609136A (en) * 1994-06-28 1997-03-11 Cummins Engine Company, Inc. Model predictive control for HPI closed-loop fuel pressure control system
US6164242A (en) * 1995-06-26 2000-12-26 Alfa Laval Agri Ab Method of regulating the vacuum level in a milking apparatus, and a milking apparatus
US5845599A (en) * 1997-02-10 1998-12-08 Smartenergy Services, Inc. Vacuum controller and method of controlling vacuum in a dairy milking systems

Also Published As

Publication number Publication date
WO2004019144A2 (en) 2004-03-04
AU2003213620A1 (en) 2004-03-11
AU2003213620A8 (en) 2004-03-11

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