Source: http://www.google.com/patents/US5069086?dq=7,446,777
Timestamp: 2016-10-26 17:51:26
Document Index: 62241461

Matched Legal Cases: ['art, 10', 'art, 12', 'art 8', 'art 10', 'art 14', 'art 16']

Patent US5069086 - Belt ratio controller for a continuously vaiable transmission - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA continuously variable transmission which effects a speed change by increasing and decreasing the width of a groove between a fixed pulley part and a movable pulley part. A belt ratio controller for the transmission uses oil pressure to increase and decrease the rotating radius of a belt wound on the...http://www.google.com/patents/US5069086?utm_source=gb-gplus-sharePatent US5069086 - Belt ratio controller for a continuously vaiable transmissionAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS5069086 APublication typeGrantApplication numberUS 07/443,707Publication dateDec 3, 1991Filing dateNov 29, 1989Priority dateNov 30, 1988Fee statusPaidAlso published asCA2004187A1, CA2004187C, DE3939671A1, DE3939671C2Publication number07443707, 443707, US 5069086 A, US 5069086A, US-A-5069086, US5069086 A, US5069086AInventorsKatsuaki Murano, Yoshinori Yamashita, Sadayuki Hirano, Takumi Tatsumi, Hiroaki YamamotoOriginal AssigneeSuzuki Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (12), Referenced by (11), Classifications (24), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetBelt ratio controller for a continuously vaiable transmission
US 5069086 AAbstract
A continuously variable transmission which effects a speed change by increasing and decreasing the width of a groove between a fixed pulley part and a movable pulley part. A belt ratio controller for the transmission uses oil pressure to increase and decrease the rotating radius of a belt wound on the pulley parts, the belt controller controlling the belt ratio to a target belt ratio value set based on the opening of the throttle when starting on a road having a small road surface friction coefficient.
1. A belt ratio controller for a continuously variable transmission, comprising means for controlling a speed change by increasing and decreasing the width of a groove between a fixed pulley part and a movable pulley part of the transmission by varying an oil pressure to increase and decrease the rotating radius of a belt wound on the pulley parts and thereby change a belt ratio, surface condition indicating means for generating a signal indicating whether the vehicle is on a slippery surface, and control means responsive to said signal indicating the vehicle is on a slippery surface for controlling the belt ratio toward a target belt ratio value set based on the opening of a throttle at the time of starting vehicle movement.
The present invention relates to a belt ratio controller for a continuously variable transmission and, more specifically, to a belt ratio controller for a continuously variable transmission which is capable of preventing vehicle wheels from slipping at the time of starting vehicle movement on a road having a small road surface friction coefficient, to facilitate easy starting.
In a vehicle, a transmission is interposed between an internal combustion engine and the driving wheels. This transmission changes the driving force applied to and the speed of the driving wheels to meet the travel condition of the vehicle according to a wide range, in order to optimize the performance of the internal combustion engine. One known continuously variable transmission includes a pulley having a fixed pulley part fixed to a shaft and a movable pulley part axially movably supported on the shaft separate from the fixed pulley part, the width of a groove formed between the pulley parts being increased and decreased by oil pressure control to increase and decrease the rotating radius of a power transfer belt wound on the pulley, thereby changing the belt ratio. Continuously variable transmissions of this type have been disclosed for instance in Japanese Patent Laid Open Publication Nos. Sho 186656/1982, Sho 43249/1984, Sho 77159/1984 and Sho 233256/1986.
In order to attain this purpose, the present invention provides a belt ratio controller for a continuously variable transmission of the type which effects a speed change by increasing and decreasing the width of a groove between a fixed pulley part and a movable pulley part by using oil pressure in order to increase and decrease the rotating radius of a belt wound on the pulley parts, the belt controller controlling the belt ratio to the target belt ratio value set by the opening of the throttle when starting on a road having a small road surface friction coefficient.
An embodiment of the present invention will be explained in detail hereinbelow with reference to the accompanying drawings, in which:
FIGS. 1 to 5 show the embodiments of the present invention. In FIG. 1, reference numeral 2 indicates the continuously variable transmission, 4 a belt, 6 a driving side pulley, 8 a driving side fixed pulley part, 10 a driving side movable pulley part, 12 a driven side pulley, 14 a driven side fixed pulley part, and 16 a driven side movable pulley part. The driving side pulley 6 has the driving side fixed pulley part 8 fixed to a rotating shaft 18 rotated by a motor, as shown in FIG. 1, and the driving side movable pulley part 10 is supported on the shaft 18 so as to be movable in the direction of the axis of the shaft 18 but not to rotate relative thereto. The driven side pulley 12 is constructed similar to the driving side pulley 6 with regard to its driven side fixed pulley part 14 and driven side movable pulley part 16.
1. Signal indicating a shift lever position
Facilitates control of the line pressure, belt ratio and clutch pressure required for respective ranges represented by respective shift position signals such as P, R, N, D and L.
2. Signal indicating the opening degree of a carburetor throttle
Facilitates correction of a carburetor throttle opening sensor and improvement of accuracy in the control.
3. Accelerator pedal signal
Indicates the degree of stepping down of an accelerator pedal, from which the intention of a driver is detected to facilitate control at the time of travel or starting.
4. Brake signal
Indicates the presence and absence of stepping on a brake pedal and facilitates disengagement control of the clutch.
5. Power mode option signal
This optional driver-controlled signal selects sporty power performance or economical performance.
When a shift position selector is situated at N or P and the oil pressure clutch is completely disengaged, the clutch pressure is the minimum pressure (zero) and the oil clutch is turned off.
When the shift position selector is situated at D or R and the throttle is set to indicate no intention to travel, or when it is desired to cut off the engine torque by slowing down during travel, the clutch pressure is high enough in level for the clutch to slightly engage (3.5-4.0 kg/cm2), and produces a semi-engaged clutch state (creep state).
(3) Snow mode
The target belt ratio value is determined according to the opening of the throttle at the time of the start from a memory map correlating the opening of the throttle to a target belt ratio value.
(4) Normal start mode
When the clutch is engaged at the time of starting or after the clutch has been disengaged, the clutch pressure is set to a proper level according to an engine generated torque (clutch input torque), for preventing the blowing up of the engine and for effecting smooth operating of the vehicle.
(5) Special start mode
(a) The speed of the vehicle is above 8 km/h and a shift selection is repeatedly changed, such as D to N to D, or
(6) Coast mode
The rotations of the input shaft and the output shaft of the clutch are synchronized to make the amount of clutch slip constant (for instance 50 rpm).
(7) Drive mode
With a complete travel state established, with the clutch completely engaged (clutch lock up state) or substantially in the lock up state after shifting from a start mode, the clutch pressure is set to a level high enough to completely endure the engine torque.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4670843 *Oct 11, 1984Jun 2, 1987Nissan Motor Co., Ltd.Control system for continuously variable transmissionUS4730518 *Sep 26, 1986Mar 15, 1988Fuji Jukogyo Kabushiki KaishaSystem for the transmission ratio of a continuously variable transmissionUS4743223 *Jun 3, 1986May 10, 1988Toyota Jidosha Kabushiki KaishaSpeed ratio control system for a continuously variable transmission for vehicleUS4757870 *Feb 18, 1986Jul 19, 1988Nissan Motor Co., Ltd.Four wheel drive system having driving force distribution control responsive to front and rear wheel speed differenceUS4858498 *Oct 30, 1986Aug 22, 1989Mazda Motor CorporationAutomatic transmission system for a vehicleUS4907471 *Dec 2, 1988Mar 13, 1990Nissan Motor Co., Ltd.V-belt type continuously variable transmissionDE2437264A1 *Aug 2, 1974Feb 12, 1976Daimler Benz AgIdling control for automatic transmission - with idling speed reduced during braking to prevent transmission dragJPS5821049A * Title not availableJPS5943249A * Title not availableJPS5977159A * Title not availableJPS57186656A * Title not availableJPS61233256A * Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS5586953 *Jan 27, 1995Dec 24, 1996Nissan Motor Co., Ltd.System for controlling a continuously variable transmission in response to a sensed wheel decelerationUS5658216 *May 12, 1995Aug 19, 1997Nissan Motor Co., Ltd.CVT ratio control for moving off automotive vehicle from standstillUS5674150 *Jan 26, 1996Oct 7, 1997Honda Giken Kogyo Kabushiki KaishaControl apparatus for transmissionUS6199005Apr 28, 1998Mar 6, 2001Nissan Motor Co., Ltd.Vehicle drive force control deviceUS6220985 *Feb 6, 1997Apr 24, 2001Nissan Motor Co., Ltd.Speed change ratio controller for stepless automatic transmissionUS6634982 *Dec 22, 2000Oct 21, 2003Aisin Aw Co., Ltd.Automatic speed changer controller, automatic speed changer control method, and recording medium having program for method recorded thereonUS8439797 *May 14, 2013Yamaha Hatsudoki Kabushiki KaishaContinuously variable transmissionUS8535186 *Aug 30, 2007Sep 17, 2013Yamaha Hatsudoki Kabushiki KaishaStraddle-type vehicleUS20080039252 *Aug 8, 2007Feb 14, 2008Yamaha Hatsudoki Kabushiki KaishaContinuously Variable TransmissionUS20080053731 *Aug 30, 2007Mar 6, 2008Yamaha Hatsudoki Kabushiki KaishaStraddle-Type VehicleEP0875414A2 *Apr 28, 1998Nov 4, 1998Nissan Motor Company LimitedVehicle drive force control device* Cited by examinerClassifications U.S. Classification477/39, 477/98, 477/48, 474/12International ClassificationF16H9/00, F16H61/66, F16H63/40, F16H59/50, F16H59/66, F16H61/662, F16H61/02, F16H61/00, B60K28/16, F16H61/12Cooperative ClassificationY10T477/653, Y10T477/6203, F16H61/66259, F16H59/66, Y10T477/62427, F16H2059/506, B60K28/165, F16H61/66European ClassificationB60K28/16T, F16H61/662H2Legal EventsDateCodeEventDescriptionNov 29, 1989ASAssignmentOwner name: MITSUBISHI DENKI KABUSHIKI KAISHA, 2-3, MARUNOUCHIFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MURANO, KATSUAKI;YAMASHITA, YOSHINORI;HIRANO, SADAYUKI;AND OTHERS;REEL/FRAME:005189/0054Effective date: 19891110Owner name: SUZUKI JIDOSHA KOGYO KABUSHIKI KAISHA, 300 TAKATSUFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MURANO, KATSUAKI;YAMASHITA, YOSHINORI;HIRANO, SADAYUKI;AND OTHERS;REEL/FRAME:005189/0054Effective date: 19891110Jun 2, 1992ASAssignmentOwner name: SUZUKI MOTOR CORPORATION, JAPANFree format text: CHANGE OF NAME;ASSIGNOR:SUZUKI JIDOSHA KOGYA KABUSHIKI KAISHA;REEL/FRAME:006137/0648Effective date: 19901212Mar 30, 1993CCCertificate of correctionMay 22, 1995FPAYFee paymentYear of fee payment: 4May 24, 1999FPAYFee paymentYear of fee payment: 8May 7, 2003FPAYFee paymentYear of fee payment: 12Jun 18, 2003REMIMaintenance fee reminder mailedRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services