WO2002040898A1 - Control system and method for a continuously variable transmission - Google Patents
Control system and method for a continuously variable transmission Download PDFInfo
- Publication number
- WO2002040898A1 WO2002040898A1 PCT/GB2001/005075 GB0105075W WO0240898A1 WO 2002040898 A1 WO2002040898 A1 WO 2002040898A1 GB 0105075 W GB0105075 W GB 0105075W WO 0240898 A1 WO0240898 A1 WO 0240898A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- clutch
- confrol
- variator
- valve
- Prior art date
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
- F16H61/04—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
- 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
- F16H61/0021—Generation or control of line pressure
-
- 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 variators with summing differentials, with the input of the CVT connected or connectable to the input shaft
- F16H2037/0886—Power split variators with summing differentials, with the input of the CVT connected or connectable to the input shaft with switching means, e.g. to change ranges
-
- 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
- F16H61/66—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
- F16H61/6648—Friction gearings controlling of shifting being influenced by a signal derived from the engine and the main coupling
Definitions
- the present invention relates to a confrol system and method for continuously
- variable transmission systems suitable for use in motor vehicles, for example.
- each regime is selected by a clutch which
- the shift sequence is intended to produce an imperceptible regime change
- the finite fill time requires that the process be started before the fransmission reaches
- variable connected to the input shaft, a mixing epicyclic gear
- the confrol system comprises first confrol means controlling a
- the confrol system comprises:
- first and second hydraulic pumps associated with said first and second
- a first hydraulic pressure confrol valve for controlling the pressure of hydraulic fluid to be supplied to the roller confrol pistons of the variator; a second hydraulic pressure confrol valve for controlling the pressure of hydraulic pressure to be supplied to a clutching arrangement of the transmission; wherein the valves are connected in flow series and by a first fluid directing valve means for directing flow from each pump to a first point upsfream of the first valve or to a point downsfream of the first valve but upsfream of the second valve.
- system further comprises a source of pressurized
- the source of pressurized fluid preferably comprises an accumulator which
- Each clutch may be any clutch that is selectively connectable to the clutches via valve means.
- Each clutch may be any clutch that is selectively connectable to the clutches via valve means.
- Each clutch may be any clutch that is selectively connectable to the clutches via valve means.
- Each clutch may be any clutch that is selectively connectable to the clutches via valve means.
- Each clutch may be any clutch that is selectively connectable to the clutches via valve means.
- a control method for a multi-regime continuously variable ratio fransmission system having input and output shafts and comprising a continuously variable ratio
- variable connected to the input shaft, a mixing epicyclic gear
- control method comprises controlling a clutch apply pressure
- transmission comprises: connecting the valves in flow series and directing fluid flow from
- each pump to a first point upsfream of the first valve or to a second point downstream
- the fluid pressure to engage the clutches is from a
- the source of pressurized fluid preferably comprises an
- Fig. 1 is a schematic illustration of a vehicle transmission controlled in
- Fig. 2 is a flow chart illustrating the control of the fransmission of Fig.1;
- Fig. 3 is a schematic illustration of a first embodiment of hydraulic control
- Fig. 4 is a schematic illustration of a further embodiment of hydraulic clutch
- Fig. 1 illustrates one embodiment of continuously variable fransmission
- the fransmission as illustrated is generally conventional.
- variator 10 has an input shaft 11 from an engine 12.
- the input shaft 11 from an engine 12.
- rollers 18 are mounted between opposing faces of these discs to fransmit drive from
- the input shaft 11 also drives a gear 20 mounted thereon which meshes with
- the chain 17 transmits the output of
- the output shaft 25 may also be connected directly to the variator
- epicyclic gearset E is effectively inactive and the output of the variator 10 is
- the present invention relates to the method of achieving
- step 100 (hereafter "step” will be abbreviated to "S") the transmission is
- the clutch engagement pressure is applied as rapidly as possible but
- the circuit comprises a confrol circuit 30 having first and
- valves N3, N4, N5 are arranged
- embodiments are pressure raising valves, i.e. operation thereof restricts the flow
- V5 are simply solenoid valves having no effect on the line pressure. As can be seen,
- confrol valves VI and V2 are connected in flow series.
- One double-acting hydraulic piston 19 is illustrated schematically in more
- each roller 18 is mounted in the cavity 53 of a hollow shaft 54
- This piston is formed with opposed piston heads 56,
- end cap 58, 59 act to define the hydraulic piston 19 associated with each roller.
- the solenoid valves SI, S2, V4, V5 are arranged to connect either or both of
- V 1 may be
- V 2 may be employed as the clutch
- valve SI is switched to the
- clutch C L is connected to a sump or drain to an alternative position in which the
- the clutch C R may be applied identically by suitable actuation of valves S2,
- V2 is employed in the control of roller position and/or confrol clutch engagement.
- V 2 will have absolutely no effect on the back pressure created by valve V as i
- FIG. 4 A simplified embodiment of the present invention is illusfrated in Fig. 4.
- Fig. 4 illustrates the two hydraulically
- the pump output is fed via a non-return valve 86 to the accumulator 80 which
- confrol valves 88, 90 which each confrol the application
- the clutch apply pressure is thus applied in a single stage
- the arrangement allows the full clutch engagement pressure to be applied in 40ms or less.
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)
- Liquid Crystal Substances (AREA)
- Transmissions By Endless Flexible Members (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/432,137 US6979276B2 (en) | 2000-11-16 | 2001-11-16 | Control system and method for a continuously variable transmission |
AU2002223820A AU2002223820A1 (en) | 2000-11-16 | 2001-11-16 | Control system and method for a continuously variable transmission |
DE60126808T DE60126808T2 (en) | 2000-11-16 | 2001-11-16 | CONTROL SYSTEM AND METHOD FOR A STEP-UP ADJUSTABLE GEARBOX |
EP01996704A EP1334298B1 (en) | 2000-11-16 | 2001-11-16 | Control system and method for a continuously variable transmission |
JP2002543185A JP2004514103A (en) | 2000-11-16 | 2001-11-16 | Control system and control method for continuously variable transmission |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0027997A GB2369164A (en) | 2000-11-16 | 2000-11-16 | Hydraulic control of a continuously-variable ratio transmission |
GB0027997.6 | 2000-11-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002040898A1 true WO2002040898A1 (en) | 2002-05-23 |
Family
ID=9903306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2001/005075 WO2002040898A1 (en) | 2000-11-16 | 2001-11-16 | Control system and method for a continuously variable transmission |
Country Status (10)
Country | Link |
---|---|
US (1) | US6979276B2 (en) |
EP (1) | EP1334298B1 (en) |
JP (1) | JP2004514103A (en) |
CN (1) | CN1474917A (en) |
AT (1) | ATE354749T1 (en) |
AU (1) | AU2002223820A1 (en) |
DE (1) | DE60126808T2 (en) |
ES (1) | ES2282324T3 (en) |
GB (1) | GB2369164A (en) |
WO (1) | WO2002040898A1 (en) |
Cited By (2)
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---|---|---|---|---|
WO2005047738A1 (en) * | 2003-11-07 | 2005-05-26 | Torotrak (Development) Limited | Control of the line pressure in a multi-regime continuously variable transmission |
WO2015137906A1 (en) * | 2014-03-10 | 2015-09-17 | Allison Transmission, Inc. | Hydraulic transmission control system and method thereof |
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CA2401474C (en) * | 2002-09-05 | 2011-06-21 | Ecole De Technologie Superieure | Drive roller control for toric-drive transmission |
US7011600B2 (en) | 2003-02-28 | 2006-03-14 | Fallbrook Technologies Inc. | Continuously variable transmission |
DE102004030284B4 (en) * | 2003-06-26 | 2012-09-27 | Nsk Ltd. | Continuously variable transmission device |
DE102004024031A1 (en) | 2004-05-11 | 2005-12-08 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Hydraulic circuit for a toroidal transmission |
ATE550573T1 (en) | 2004-10-05 | 2012-04-15 | Fallbrook Technologies Inc | CONTINUOUSLY ADJUSTABLE GEARBOX |
US7238139B2 (en) * | 2005-01-06 | 2007-07-03 | Ford Global Technologies, Inc. | Electric and hybrid electric powertrain for motor vehicles |
JP4483819B2 (en) * | 2005-04-28 | 2010-06-16 | 株式会社豊田中央研究所 | Power transmission system |
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JP4797599B2 (en) * | 2005-11-28 | 2011-10-19 | 井関農機株式会社 | Shift control device for toroidal continuously variable tractor |
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US8738255B2 (en) | 2007-02-01 | 2014-05-27 | Fallbrook Intellectual Property Company Llc | Systems and methods for control of transmission and/or prime mover |
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US10023266B2 (en) | 2016-05-11 | 2018-07-17 | Fallbrook Intellectual Property Company Llc | Systems and methods for automatic configuration and automatic calibration of continuously variable transmissions and bicycles having continuously variable transmissions |
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Citations (7)
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DE2814222A1 (en) | 1977-04-04 | 1978-10-05 | Vadetec Corp | TRANSMISSION WITH CHANGEABLE SPEED |
GB2100372A (en) | 1979-06-20 | 1982-12-22 | Nat Res Dev | Improvements in or relating to steplessly-variable ratio transmissions |
GB2108600A (en) | 1981-10-24 | 1983-05-18 | Leyland Vehicles | Continuously-variable-ratio transmisson |
GB2312258A (en) * | 1996-04-19 | 1997-10-22 | Torotrak Dev Ltd | CVT control system has regime change clutches controlled independently of variator |
EP0899484A1 (en) * | 1997-08-25 | 1999-03-03 | Mazda Motor Corporation | Control system for a continuously variable transmission |
US5938557A (en) * | 1996-04-19 | 1999-08-17 | Torotrak (Development) Limited | CVT Control System |
GB2337090A (en) * | 1998-05-08 | 1999-11-10 | Torotrak Dev Ltd | Hydraulic control circuit for a continuously-variable ratio transmission |
Family Cites Families (2)
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---|---|---|---|---|
GB8819430D0 (en) * | 1988-08-16 | 1988-09-21 | Greenwood C J | Improvements in/relating to hydraulic control circuits for continuously-variable-ratio transmissions |
US6045477A (en) * | 1999-06-14 | 2000-04-04 | General Motors Corporation | Continuously variable multi-range powertrain with a geared neutral |
-
2000
- 2000-11-16 GB GB0027997A patent/GB2369164A/en not_active Withdrawn
-
2001
- 2001-11-16 AU AU2002223820A patent/AU2002223820A1/en not_active Abandoned
- 2001-11-16 DE DE60126808T patent/DE60126808T2/en not_active Expired - Lifetime
- 2001-11-16 WO PCT/GB2001/005075 patent/WO2002040898A1/en active IP Right Grant
- 2001-11-16 JP JP2002543185A patent/JP2004514103A/en active Pending
- 2001-11-16 AT AT01996704T patent/ATE354749T1/en not_active IP Right Cessation
- 2001-11-16 US US10/432,137 patent/US6979276B2/en not_active Expired - Lifetime
- 2001-11-16 ES ES01996704T patent/ES2282324T3/en not_active Expired - Lifetime
- 2001-11-16 CN CNA018190456A patent/CN1474917A/en active Pending
- 2001-11-16 EP EP01996704A patent/EP1334298B1/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2814222A1 (en) | 1977-04-04 | 1978-10-05 | Vadetec Corp | TRANSMISSION WITH CHANGEABLE SPEED |
GB2100372A (en) | 1979-06-20 | 1982-12-22 | Nat Res Dev | Improvements in or relating to steplessly-variable ratio transmissions |
GB2108600A (en) | 1981-10-24 | 1983-05-18 | Leyland Vehicles | Continuously-variable-ratio transmisson |
GB2312258A (en) * | 1996-04-19 | 1997-10-22 | Torotrak Dev Ltd | CVT control system has regime change clutches controlled independently of variator |
US5938557A (en) * | 1996-04-19 | 1999-08-17 | Torotrak (Development) Limited | CVT Control System |
EP0899484A1 (en) * | 1997-08-25 | 1999-03-03 | Mazda Motor Corporation | Control system for a continuously variable transmission |
GB2337090A (en) * | 1998-05-08 | 1999-11-10 | Torotrak Dev Ltd | Hydraulic control circuit for a continuously-variable ratio transmission |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005047738A1 (en) * | 2003-11-07 | 2005-05-26 | Torotrak (Development) Limited | Control of the line pressure in a multi-regime continuously variable transmission |
WO2015137906A1 (en) * | 2014-03-10 | 2015-09-17 | Allison Transmission, Inc. | Hydraulic transmission control system and method thereof |
Also Published As
Publication number | Publication date |
---|---|
ATE354749T1 (en) | 2007-03-15 |
EP1334298A1 (en) | 2003-08-13 |
US6979276B2 (en) | 2005-12-27 |
ES2282324T3 (en) | 2007-10-16 |
EP1334298B1 (en) | 2007-02-21 |
GB0027997D0 (en) | 2001-01-03 |
DE60126808D1 (en) | 2007-04-05 |
US20040065520A1 (en) | 2004-04-08 |
GB2369164A (en) | 2002-05-22 |
AU2002223820A1 (en) | 2002-05-27 |
DE60126808T2 (en) | 2007-11-15 |
CN1474917A (en) | 2004-02-11 |
JP2004514103A (en) | 2004-05-13 |
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