[go: up one dir, main page]

WO1996028670A1 - Transmissions pour vehicule - Google Patents

Transmissions pour vehicule Download PDF

Info

Publication number
WO1996028670A1
WO1996028670A1 PCT/GB1996/000577 GB9600577W WO9628670A1 WO 1996028670 A1 WO1996028670 A1 WO 1996028670A1 GB 9600577 W GB9600577 W GB 9600577W WO 9628670 A1 WO9628670 A1 WO 9628670A1
Authority
WO
WIPO (PCT)
Prior art keywords
ratio
vehicle
gearbox
accelerator
electronic control
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
PCT/GB1996/000577
Other languages
English (en)
Inventor
Paul Malcolm Darnell
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.)
Automotive Products PLC
Original Assignee
Automotive Products PLC
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 Automotive Products PLC filed Critical Automotive Products PLC
Priority to GB9620786A priority Critical patent/GB2302378A/en
Publication of WO1996028670A1 publication Critical patent/WO1996028670A1/fr
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
    • F16H61/02—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 characterised by the signals used
    • F16H61/0202—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 characterised by the signals used the signals being electric
    • F16H61/0204—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0213—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
    • 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
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H2059/006—Overriding automatic control
    • 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
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/02—Selector apparatus
    • F16H59/08—Range selector apparatus
    • F16H2059/082—Range selector apparatus for different transmission modes
    • F16H2059/084—Economy mode
    • 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
    • F16H61/02—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 characterised by the signals used
    • F16H61/0202—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 characterised by the signals used the signals being electric
    • F16H61/0204—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0213—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 characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
    • F16H2061/0234—Adapting the ratios to special vehicle conditions
    • F16H2061/0237—Selecting ratios for providing engine braking
    • 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
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H59/141—Inputs being a function of torque or torque demand of rate of change of torque or torque demand
    • 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
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H59/18—Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal
    • 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
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H59/18—Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal
    • F16H59/20—Kickdown
    • 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
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H59/18—Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal
    • F16H59/22—Idle position
    • 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
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • 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
    • F16H59/00—Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/44—Inputs being a function of speed dependent on machine speed, e.g. the vehicle speed
    • 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
    • F16H61/68—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 stepped gearings
    • F16H61/682—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 stepped gearings with interruption of drive

Definitions

  • This invention relates to vehicle transmissions which include multi-ratio gearbox and in particular to transmissions which have an automatic ratio selection mode.
  • a vehicle transmission comprising a multi-ratio gearbox, an electronic control means which receives inputs from a plurality of operating parameters of an associated vehicle and determines the appropriate gearbox ratio for the current vehicle operating conditions, and a ratio selection means which receives ratio selection signals from the electronic control means and selects the appropriate ratio, the transmission being characterised in that the electronic control means is arranged to signal a downshift in the operative ratio of the gearbox if any one of the following conditions occurs:-
  • b. brakes of an associated vehicle are applied; c. a zero depression condition of the accelerator has existed for a predetermined time period (typically 3 seconds) ;
  • no downshift will be made when any one of the above conditions occurs if this will result in an engine of the associated vehicle exceeding a preset speed.
  • This preset speed is chosen to prevent permanent damage to the engine and associated clutch and drive line components.
  • the electronic control means will prevent the engine exceeding its maximum rated speed and the clutch driven plate speed (when driven by the road wheels) exceeding its burst speed (typically 1.4 X max. engine speed).
  • Fig 1 shows in diagrammatic form the general layout of a vehicle transmission embodying the present invention
  • Fig 2 shows in flow diagram form the criteria used in the downshifting feature
  • Fig 3 shows diagrammatically the generation of the clutch engagement control signal.
  • Fig 1 this shows an engine 10 with a starter and an associated starter circuit 10a which is coupled through a friction clutch 14 with a five speed synchronised lay-shaft type gearbox 12 via a gearbox input shaft 15.
  • fuel is supplied to the engine by a throttle 16 which includes a throttle valve 18 operated by accelerator pedal 19.
  • the invention is equally applicable to electronic or mechanical fuel injected petrol or diesel engines.
  • the clutch 14 is actuated by a release fork 20 which is operated by a slave cylinder 22.
  • the selection of the operative ratio of the gearbox may be controlled manually or automatically.
  • a gear selector lever 24 operates in a gate 50 having two limbs 51 and 52 joined by a cross track 53.
  • the transmission operates in manual mode and the lever 24 is biassed to return to a central position 51a when released.
  • Each movement of lever 24 from central position 51a to a downchange position 51b selects a downchange of one ratio in the currently operative ratio of the gearbox and each movement to an upchange position 51c selects an upchange of one ratio.
  • lever 24 in limb 51 and 52 is sensed by a series of sensors (e.g. micro switches and optical sensors spaced around the gate) which are indicated collectively at 33 and whose signal outputs Vs are fed to electronic control unit 36.
  • Control 36 in turn issues signals to a gear engaging mechanism 25 which includes, for example, hydraulic rams and solenoid control valves to move selector members to engage the desired gearbox ratio.
  • gear engaging mechanism 25 includes, for example, hydraulic rams and solenoid control valves to move selector members to engage the desired gearbox ratio.
  • the limb 52 of gate 50 has four positions; a 'P' position in which the lever 24 is placed to park the vehicle; an 'R' position in which the lever 24 is placed to select reverse; an , N' position in which the lever is placed to select neutral and a 'D' position in which the lever is placed when it is desired that the forward drive ratio of the gearbox should be selected automatically by control unit 36 in accordance with the current operating conditions of the vehicle.
  • control unit 36 determines which ratio is most appropriate for the current vehicle operating conditions and issues appropriate ratio selection signals to gear engaging mechanism 25.
  • To determine the appropriate operating ratio control unit 36 receives signals from a plurality of vehicle operating parameter sensors such as signals Ve proportional to engine speed from engine speed sensor 26. Signals Vt are received from throttle valve position sensor 30 proportional to the current throttle opening and an accelerator pedal position sensor 19a is also provided to feed accelerator pedal position signals Va to control unit 36.
  • a plurality of vehicle operating parameter sensors such as signals Ve proportional to engine speed from engine speed sensor 26.
  • Signals Vt are received from throttle valve position sensor 30 proportional to the current throttle opening and an accelerator pedal position sensor 19a is also provided to feed accelerator pedal position signals Va to control unit 36.
  • an accelerator pedal position sensor 19a is also provided to feed accelerator pedal position signals Va to control unit 36.
  • only one of the sensors 19a and 30 may be provided. Most commonly in such a situation it is sensor 19a which will be provided.
  • Control unit 36 also receives a gear signal Vg from gear position sensor 32 which corresponds to the gear ratio currently engaged, signals Vc from slave cylinder position sensor 34, which varying with the position of the slave cylinder 22, and signals Vdp proportional to clutch driven plate speed from speed sensor 42 which actually senses the speed of the gearbox shaft 15 (which is equal to that of a driven plate 40 of the clutch 14).
  • a vehicle speed sensor 45 for example the variable reluctance type, is also provided to feed a vehicle speed signal Vv to control unit 36.
  • driven plate speed sensor 42 may be omitted and the driven plate speed can be calculated by the control unit 36 from the vehicle speed and the gear ratio currently engaged.
  • a uzzer 50 is connected with control unit 36 to warn/indicate to the vehicle operator when certain vehicle operating conditions occur.
  • a flashing warning light (not shown) may be used.
  • control unit 36 also controls the engagement and disengagement of the clutch 14. This is done by the control unit 36 generating a reference signal Vr in a generator C (see Figure 3) which is representative of a desired engine speed. This reference signal is compared in comparator A with the actual engine speed signal Ve from engine speed sensor 26 to produce an error signal E which is compared in comparator B with the clutch actuator position signal Vc from sensor 34 to provide a clutch engagement control signal Vce which the control unit 36 outputs to the hydraulic control 38. Operation of a control unit 36 in this general manner is described in more detail, for example in the Applicants earlier European Patents 0038113 and 0043660.
  • control unit 36 In addition to controlling the engagement and disengagement of clutch 14 the control unit 36 also controls the throttle setting via a throttle control 37 when its control logic indicates that an override of the throttle opening set by the driver's operation of the accelerator 19 is desirable.
  • the throttle control 37 may be omitted or torque reduction during gear changes can be achieved by varying engine timing and/or fuel supply (possibly using any existing electronic engine management system) .
  • a brake application sensor 46 is also provided (this may, for example, be a sensor operating on brake line pressure) which provides a signal Vb to control unit 36 when the brakes of the vehicle are applied.
  • an accelerometer may replace sensor 46 or operation of the brake lights may be detected to indicate when the vehicle brakes are applied.
  • control unit 36 is arranged to command a downshift in the operative ratio of the gearbox if any one of the following conditions occurs:-
  • a zero depression condition of the accelerator has existed for a predetermined time period (typically 3 seconds) ;
  • Condition a) above indicates a requirement for rapid acceleration of the vehicle and by relying on a rate measurement (rather than a given angle of depression of the accelerator pedal as in a normal kickdown control) the downshift can be actioned earlier in the accelerator pedal movement thus significantly increasing the speed of the response of the vehicle.
  • the preset rate will be 2 per cent of the full accelerator travel per 5 milliseconds.
  • Conditions b) and c) above provide a degree of engine braking to assist in deceleration of the vehicle. These features may be standard in the transmission control or may only be invoked when the operator has selected a "sport" mode of operation of the transmission.
  • Condition d) above invokes increased engine braking when the vehicle is gathering speed going downhill. This is particularly significant when the vehicle is heavily laden or towing.
  • Condition e invokes a downshift when the vehicle is climbing a hill in too high a gear. Further upshifts may be prevented in this condition until a decrease in accelerater depression is detected with a steady or increasing vehicle speed.
  • Figure 2 shows diagrammatically the tests applied by control unit 36 in deciding when a downshift should be made.
  • Boxes A & B determine when condition a) above exists
  • box C determines when condition b) exists
  • box D determines when condition c) exists
  • boxes E & F determine when condition d) exists
  • boxes A & G determine when condition e) exists.
  • Box H prevents downshifts into first gear and box I provides the overall check that the contemplated downshift which is to be actioned by box J will not cause the engine speed to exceed the preset level which will typically be of the order of 4000 r.p.m.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

Transmission pour véhicule comprenant une boîte de vitesses à rapports multiples (12), un dispositif de commande électronique (36) qui reçoit des données en entrée provenant d'un ensemble de paramètres de fonctionnement du véhicule associé, et détermine le rapport de boîte de vitesses approprié pour les conditions de fonctionnement courantes du véhicule, et un dispositif (25) de sélection de rapport, lequel reçoit des signaux de sélection de rapport du dispositif de commande électronique (36) et sélectionne le rapport approprié. Le dispositif de commande électronique (36) est également conçu pour signaler une rétrogradation de la boîte de vitesses (12) si l'une des situations suivantes de produit: a) une vitesse d'enfoncement prédéterminé de l'accélérateur (19) du véhicule associé est dépassé; b) les freins du véhicule associé sont mis en action; c) l'enfoncement de l'accélérateur (19) est nul pendant un temps prédéterminé; d) une augmentation dans la vitesse (Vv) du véhicule associé est détectée alors que l'enfoncement de l'accélérateur (19) est nul; et e) une augmentation de l'enfoncement de l'accélérateur (Va) est détectée en même temps qu'une diminution de la vitesse du véhicule (Vv).
PCT/GB1996/000577 1995-03-15 1996-03-14 Transmissions pour vehicule Ceased WO1996028670A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9620786A GB2302378A (en) 1995-03-15 1996-03-14 Vehicle transmissions

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9505176.9A GB9505176D0 (en) 1995-03-15 1995-03-15 Vehicle transmissions
GB9505176.9 1995-03-15

Publications (1)

Publication Number Publication Date
WO1996028670A1 true WO1996028670A1 (fr) 1996-09-19

Family

ID=10771209

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/000577 Ceased WO1996028670A1 (fr) 1995-03-15 1996-03-14 Transmissions pour vehicule

Country Status (2)

Country Link
GB (1) GB9505176D0 (fr)
WO (1) WO1996028670A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998019082A1 (fr) * 1996-10-25 1998-05-07 Renault Procede de commande du passage d'une transmission automatique sur un rapport inferieur
WO2000019129A1 (fr) * 1998-09-28 2000-04-06 Zf Friedrichshafen Ag Procede de commande d'une boite de vitesses automatique

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2268661A1 (fr) * 1974-04-25 1975-11-21 Nissan Motor
GB2042105A (en) * 1979-02-02 1980-09-17 Nissan Motor Automatic transmission system provided with engine braking
EP0038083A2 (fr) * 1980-04-15 1981-10-21 Nippondenso Co., Ltd. Commande électronique pour transmission automatique
JPS60259532A (ja) * 1984-06-06 1985-12-21 Nissan Motor Co Ltd 自動速度制御装置
JPS61103045A (ja) * 1984-10-26 1986-05-21 Toyoda Autom Loom Works Ltd 自動変速機
JPS61184136A (ja) * 1985-02-12 1986-08-16 Katsumi Takamura 自動車用自動減速装置
US4916979A (en) * 1988-04-18 1990-04-17 Eaton Corporation On-grade shift logic with provision for skip downshifts
DE3939303A1 (de) * 1988-11-28 1990-09-27 Nissan Motor Schaltsteuereinrichtung fuer ein automatikgetriebe fuer kraftfahrzeuge
JPH06129521A (ja) * 1992-10-15 1994-05-10 Toyota Motor Corp 車両用自動変速機の変速制御装置
GB2282861A (en) * 1993-10-15 1995-04-19 Lucas Ind Plc Methods and systems for controlling automatic transmission systems to allow engine braking

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2268661A1 (fr) * 1974-04-25 1975-11-21 Nissan Motor
GB2042105A (en) * 1979-02-02 1980-09-17 Nissan Motor Automatic transmission system provided with engine braking
EP0038083A2 (fr) * 1980-04-15 1981-10-21 Nippondenso Co., Ltd. Commande électronique pour transmission automatique
JPS60259532A (ja) * 1984-06-06 1985-12-21 Nissan Motor Co Ltd 自動速度制御装置
JPS61103045A (ja) * 1984-10-26 1986-05-21 Toyoda Autom Loom Works Ltd 自動変速機
JPS61184136A (ja) * 1985-02-12 1986-08-16 Katsumi Takamura 自動車用自動減速装置
US4916979A (en) * 1988-04-18 1990-04-17 Eaton Corporation On-grade shift logic with provision for skip downshifts
DE3939303A1 (de) * 1988-11-28 1990-09-27 Nissan Motor Schaltsteuereinrichtung fuer ein automatikgetriebe fuer kraftfahrzeuge
JPH06129521A (ja) * 1992-10-15 1994-05-10 Toyota Motor Corp 車両用自動変速機の変速制御装置
GB2282861A (en) * 1993-10-15 1995-04-19 Lucas Ind Plc Methods and systems for controlling automatic transmission systems to allow engine braking

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 134 (M - 479) 17 May 1986 (1986-05-17) *
PATENT ABSTRACTS OF JAPAN vol. 10, no. 286 (M - 521) 27 September 1986 (1986-09-27) *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 6 (M - 551) 8 January 1987 (1987-01-08) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 432 (M - 1654) 11 August 1994 (1994-08-11) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998019082A1 (fr) * 1996-10-25 1998-05-07 Renault Procede de commande du passage d'une transmission automatique sur un rapport inferieur
WO2000019129A1 (fr) * 1998-09-28 2000-04-06 Zf Friedrichshafen Ag Procede de commande d'une boite de vitesses automatique
US6442467B1 (en) 1998-09-28 2002-08-27 Zf Friedrichshafen Ag Method for controlling an automatic transmission

Also Published As

Publication number Publication date
GB9505176D0 (en) 1995-05-03

Similar Documents

Publication Publication Date Title
US5819585A (en) Vehicle transmissions with automatic safety override when in manual mode
EP0352551B1 (fr) Logique pour passer à des rapports supérieurs
US4852006A (en) Amt off-highway downshift logic
US4916979A (en) On-grade shift logic with provision for skip downshifts
EP0244096B1 (fr) Procédé de commande d'une transmission mécanique automatique, y compris la commande pour l'embrayage et le carburant au départ arrêté
JP2840836B2 (ja) 手動エンジン圧縮ブレーキを含むａｍｔシステムの制御装置およびその制御方法
EP0584986B1 (fr) Système et procédé de commande de sélection du rapport de vitesse au démarrage
EP1118802B1 (fr) Systèmes de commande de transmission
EP0584984B1 (fr) Système et procédé de commande d'engagement de vitesse au démarrage
CA1322584C (fr) Methode et systeme de commande de transmission mecanique semi-automatique
US5875410A (en) Dynamic best gear selection for automated transmission system
US5571059A (en) Operator input system for gear shift assist mechanism
EP0925990A2 (fr) Système de commande pour transmission véhiculaire avec régulation adaptive d'un frein moteur
US4792901A (en) Method for controlling AMT system including after transmission gear change fuel control
JPS63151544A (ja) 半自動機械式変速機の制御システムおよびその制御方法
WO1996028670A1 (fr) Transmissions pour vehicule
CA2153724C (fr) Selection adaptative de rapport d'engrenages
JPH0458021A (ja) 自動クラッチ式変速機付車両のエンジン出力制御装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): BR CN GB JP KR MX US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

WWE Wipo information: entry into national phase

Ref document number: 1996906829

Country of ref document: EP

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWW Wipo information: withdrawn in national office

Ref document number: 1996906829

Country of ref document: EP

122 Ep: pct application non-entry in european phase