GB2272308A - Control system employing early-off hold function - Google Patents

Control system employing early-off hold function

Info

Publication number
GB2272308A
GB2272308A GB9325486A GB9325486A GB2272308A GB 2272308 A GB2272308 A GB 2272308A GB 9325486 A GB9325486 A GB 9325486A GB 9325486 A GB9325486 A GB 9325486A GB 2272308 A GB2272308 A GB 2272308A
Authority
GB
United Kingdom
Prior art keywords
hold function
control system
sample period
system employing
early
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.)
Granted
Application number
GB9325486A
Other versions
GB9325486D0 (en
GB2272308B (en
Inventor
Randall C Bauck
Scott E Chase
James W Hargarten
Richard J Pederson
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.)
Maxtor Corp
Original Assignee
Maxtor Corp
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 Maxtor Corp filed Critical Maxtor Corp
Publication of GB9325486D0 publication Critical patent/GB9325486D0/en
Publication of GB2272308A publication Critical patent/GB2272308A/en
Application granted granted Critical
Publication of GB2272308B publication Critical patent/GB2272308B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G05B21/00—Systems involving sampling of the variable controlled
    • G05B21/02—Systems involving sampling of the variable controlled electric

Abstract

An automatic control system (10) employing a sample and "early-off" hold function (25) is described. The invention involves implementing the hold function (23) in such a way as to reduce the amount of delay or phase lag introduced into the system (10). The reduction in phase loss permits a greater operating bandwidth, thereby enhancing performance without a corresponding increase in cost or complexity. Instead of holding a constant value for the duration of a sample period (T), the present invention holds the constant value for some fraction of the sample period (T) and then changes the output value of the hold device for the remainder of the sample period (T). <IMAGE>
GB9325486A 1991-06-28 1992-06-26 Control system employing early-off hold function Expired - Fee Related GB2272308B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72266391A 1991-06-28 1991-06-28
PCT/US1992/005413 WO1993000622A1 (en) 1991-06-28 1992-06-26 Control system employing early-off hold function

Publications (3)

Publication Number Publication Date
GB9325486D0 GB9325486D0 (en) 1994-03-02
GB2272308A true GB2272308A (en) 1994-05-11
GB2272308B GB2272308B (en) 1995-03-01

Family

ID=24902830

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9325486A Expired - Fee Related GB2272308B (en) 1991-06-28 1992-06-26 Control system employing early-off hold function

Country Status (5)

Country Link
JP (1) JPH06511332A (en)
AU (1) AU2296592A (en)
DE (1) DE4292092T1 (en)
GB (1) GB2272308B (en)
WO (1) WO1993000622A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2324171A (en) * 1997-04-10 1998-10-14 Bosch Gmbh Robert Control of a setting element

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19536697A1 (en) * 1995-09-30 1997-04-03 Bosch Gmbh Robert Arrangement for influencing a controlled system
US5682159A (en) * 1996-02-21 1997-10-28 Hewlett-Packard Company Method and apparatus for reducing phase lag resulting from digital to analog conversion
KR100518553B1 (en) * 2003-02-03 2005-10-04 삼성전자주식회사 Apparatus and method for suppressing mechanical resonance using an adaptive notch filter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582631A (en) * 1969-05-23 1971-06-01 Shell Oil Co Control of a process variable by means of computer
US3591779A (en) * 1968-02-21 1971-07-06 Massachusetts Inst Technology Variable frequency compensation for sampled data control systems
US4195337A (en) * 1977-05-26 1980-03-25 Agence Nationale De Valorisation De La Recherche (Anvar) Control method utilizing a model control scheme
US4885676A (en) * 1988-03-09 1989-12-05 Storage Technology Corporation Control loop instability detection and correction apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3591779A (en) * 1968-02-21 1971-07-06 Massachusetts Inst Technology Variable frequency compensation for sampled data control systems
US3582631A (en) * 1969-05-23 1971-06-01 Shell Oil Co Control of a process variable by means of computer
US4195337A (en) * 1977-05-26 1980-03-25 Agence Nationale De Valorisation De La Recherche (Anvar) Control method utilizing a model control scheme
US4885676A (en) * 1988-03-09 1989-12-05 Storage Technology Corporation Control loop instability detection and correction apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2324171A (en) * 1997-04-10 1998-10-14 Bosch Gmbh Robert Control of a setting element
GB2324171B (en) * 1997-04-10 1999-06-09 Bosch Gmbh Robert Control of a setting element
US6035832A (en) * 1997-04-10 2000-03-14 Robert Bosch Gmbh Method and device for controlling a control element in open loop

Also Published As

Publication number Publication date
WO1993000622A1 (en) 1993-01-07
JPH06511332A (en) 1994-12-15
AU2296592A (en) 1993-01-25
GB9325486D0 (en) 1994-03-02
GB2272308B (en) 1995-03-01
DE4292092T1 (en) 1994-07-21

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19960626