AU723256B2 - CVT control system - Google Patents

CVT control system Download PDF

Info

Publication number
AU723256B2
AU723256B2 AU23022/97A AU2302297A AU723256B2 AU 723256 B2 AU723256 B2 AU 723256B2 AU 23022/97 A AU23022/97 A AU 23022/97A AU 2302297 A AU2302297 A AU 2302297A AU 723256 B2 AU723256 B2 AU 723256B2
Authority
AU
Australia
Prior art keywords
clutch
control
regime
control system
pressure
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.)
Ceased
Application number
AU23022/97A
Other languages
English (en)
Other versions
AU2302297A (en
Inventor
Christopher John Greenwood
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.)
Torotrak Development Ltd
Original Assignee
Torotrak Development 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 Torotrak Development Ltd filed Critical Torotrak Development Ltd
Publication of AU2302297A publication Critical patent/AU2302297A/en
Application granted granted Critical
Publication of AU723256B2 publication Critical patent/AU723256B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F16H61/664—Friction gearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/0833—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths
    • F16H37/084—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths at least one power path being a continuously variable transmission, i.e. CVT
    • F16H37/086—CVT using two coaxial friction members cooperating with at least one intermediate friction member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/32—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line
    • F16H15/36—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface
    • F16H15/38—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces
    • F16H2015/383—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces with two or more sets of toroid gearings arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/0833—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths
    • F16H37/084—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths at least one power path being a continuously variable transmission, i.e. CVT
    • F16H2037/088—Power-split transmissions with summing differentials, with the input of the CVT connected or connectable to the input shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/065—Smoothing ratio shift by controlling rate of change of fluid pressure using fluid control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/065—Smoothing ratio shift by controlling rate of change of fluid pressure using fluid control means
    • F16H61/068—Smoothing ratio shift by controlling rate of change of fluid pressure using fluid control means using an orifice control valve

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Transmission Device (AREA)
  • Friction Gearing (AREA)
  • Transmission Devices (AREA)
AU23022/97A 1996-04-19 1997-04-04 CVT control system Ceased AU723256B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9608147 1996-04-19
GB9608147A GB2312258A (en) 1996-04-19 1996-04-19 CVT control system has regime change clutches controlled independently of variator
PCT/GB1997/000956 WO1997040296A1 (en) 1996-04-19 1997-04-04 Cvt control system

Publications (2)

Publication Number Publication Date
AU2302297A AU2302297A (en) 1997-11-12
AU723256B2 true AU723256B2 (en) 2000-08-24

Family

ID=10792359

Family Applications (1)

Application Number Title Priority Date Filing Date
AU23022/97A Ceased AU723256B2 (en) 1996-04-19 1997-04-04 CVT control system

Country Status (13)

Country Link
EP (1) EP0894211B1 (2)
JP (1) JP2000509130A (2)
CN (1) CN1113175C (2)
AU (1) AU723256B2 (2)
BR (1) BR9708773A (2)
CA (1) CA2251789C (2)
DE (1) DE69716416T2 (2)
GB (1) GB2312258A (2)
HU (1) HUP9901965A3 (2)
MY (1) MY118680A (2)
PL (1) PL186935B1 (2)
RU (1) RU2178109C2 (2)
WO (1) WO1997040296A1 (2)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2337090A (en) * 1998-05-08 1999-11-10 Torotrak Dev Ltd Hydraulic control circuit for a continuously-variable ratio transmission
DE19833699A1 (de) * 1998-07-27 2000-02-03 Zahnradfabrik Friedrichshafen Verfahren zur Einstellung einer Übersetzung eines stufenlosen Automatgetriebes mit einem Variator
JP2000046135A (ja) * 1998-07-28 2000-02-18 Nissan Motor Co Ltd トロイダル型無段変速機の変速制御装置
US8177009B2 (en) * 2000-01-10 2012-05-15 The United States Of America As Represented By The Administrator Of The U.S. Environmental Protection Agency Independent displacement opposing pump/motors and method of operation
GB2369164A (en) 2000-11-16 2002-05-22 Torotrak Dev Ltd Hydraulic control of a continuously-variable ratio transmission
EP1273833A1 (en) * 2001-07-05 2003-01-08 Torotrak (Development) Limited A hydraulic control circuit for a continuously variable transmission
ES2244804T3 (es) * 2001-05-01 2005-12-16 Torotrak (Development) Limited Transmisiones de variacion continua y mas especificamente al control hidraulico de las mismas.
GB0113523D0 (en) 2001-06-04 2001-07-25 Torotrak Dev Ltd An Hydraulic control circuit for a continuosly variable transmission
JP4919686B2 (ja) * 2006-03-31 2012-04-18 株式会社エクォス・リサーチ 油圧制御装置、及びそれを備えたトロイダル式無段変速機
JP4919687B2 (ja) * 2006-03-31 2012-04-18 株式会社エクォス・リサーチ トロイダル式無段変速機
GB0618929D0 (en) * 2006-09-26 2006-11-08 Torotrak Dev Ltd Continuously variable transmission
US8401752B2 (en) * 2009-12-16 2013-03-19 Allison Transmission, Inc. Fail-to-neutral system and method for a toroidal traction drive automatic transmission
GB2478003B (en) * 2010-02-23 2012-07-25 Torotrak Dev Ltd Variator traction control arrangement
GB2478120B (en) * 2010-02-24 2013-03-13 Torotrak Dev Ltd Fluid supply for continuously variable transmission
US12516730B1 (en) 2024-09-12 2026-01-06 Allison Transmission, Inc. Electro-hydraulic circuits incorporating dual pumps for improved clutch fill times, transmissions and vehicles incorporating the same, and methods associated therewith

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406597A (en) * 1964-12-01 1968-10-22 Nat Res Dev Continuously variable ratio transmission system and control system therefor
US4997412A (en) * 1989-12-26 1991-03-05 General Electric Company Non-synchronous shifting hydromechanical steering transmission

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0179737B1 (de) * 1984-09-19 1988-06-08 Ciba-Geigy Ag Wässrige Drucktinte für den Transferdruck
IN176702B (2) * 1988-11-21 1996-08-24 Torotrak Dev Ltd
IT1241614B (it) * 1990-10-03 1994-01-25 Same Spa Circuito idraulico di comando di innesti a frizione in power-shift per cambi di trattori.
US5213011A (en) * 1991-04-05 1993-05-25 Mazda Motor Corporation Power transmission device for vehicle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406597A (en) * 1964-12-01 1968-10-22 Nat Res Dev Continuously variable ratio transmission system and control system therefor
US4997412A (en) * 1989-12-26 1991-03-05 General Electric Company Non-synchronous shifting hydromechanical steering transmission

Also Published As

Publication number Publication date
HUP9901965A3 (en) 2001-05-28
HUP9901965A2 (hu) 1999-10-28
EP0894211B1 (en) 2002-10-16
GB2312258A (en) 1997-10-22
DE69716416D1 (de) 2002-11-21
WO1997040296A1 (en) 1997-10-30
JP2000509130A (ja) 2000-07-18
PL186935B1 (pl) 2004-04-30
CN1221480A (zh) 1999-06-30
BR9708773A (pt) 1999-08-03
RU2178109C2 (ru) 2002-01-10
GB9608147D0 (en) 1996-06-26
MY118680A (en) 2005-01-31
CA2251789A1 (en) 1997-10-30
EP0894211A1 (en) 1999-02-03
PL329377A1 (en) 1999-03-29
CN1113175C (zh) 2003-07-02
DE69716416T2 (de) 2003-05-08
AU2302297A (en) 1997-11-12
CA2251789C (en) 2005-01-18

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Legal Events

Date Code Title Description
FGA Letters patent sealed or granted (standard patent)