WO1998019082A1 - Method for controlling the passage of an automatic gearbox to a reduced gear ratio - Google Patents

Method for controlling the passage of an automatic gearbox to a reduced gear ratio Download PDF

Info

Publication number
WO1998019082A1
WO1998019082A1 PCT/FR1997/001906 FR9701906W WO9819082A1 WO 1998019082 A1 WO1998019082 A1 WO 1998019082A1 FR 9701906 W FR9701906 W FR 9701906W WO 9819082 A1 WO9819082 A1 WO 9819082A1
Authority
WO
WIPO (PCT)
Prior art keywords
pedal
control method
information
speed
shift
Prior art date
Application number
PCT/FR1997/001906
Other languages
French (fr)
Inventor
Eric Boitard
Original Assignee
Renault
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 Renault filed Critical Renault
Publication of WO1998019082A1 publication Critical patent/WO1998019082A1/en

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
    • 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
    • F16H59/141—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
    • 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

Definitions

  • the present invention relates to the control of automatic transmissions with stage ratios. More specifically, it relates to a method for controlling the passage of an automatic transmission to a lower gear using the accelerator pedal.
  • Electronically-controlled automatic gearboxes generally have a downshift control by depressing the accelerator pedal, allowing the driver to force the gearbox to downshift to the lowest gear, within a limit determined by engine operation .
  • the driver requests these downshifts by depressing the accelerator pedal fully, so as to pass a hard point.
  • the passage of this hard point closes, an electrical contact, called “retro-contact", which informs the electronic control unit of the gearbox, of the demotion request.
  • the feedback system or "kick-down" hard point at the end of the race has the disadvantage of being relatively uncomfortable for the driver, so that it is rarely or rarely used.
  • the present invention aims to implement a downshift function which can intervene at different points of the accelerator stroke, and without affecting the resistance to depression thereof.
  • the first information relates to the angle of inclination of the pedal relative to its rest position
  • the second information relates to its angular speed of displacement away from its rest position
  • the first item of information relates to the distance in distance of the pedal from its rest position
  • the second item of information relates to its linear speed of movement
  • FIG. 1 there is shown schematically an accelerator pedal 1 and the electronic computer 2 of an automatic gearbox, to which it transmits the information necessary for the transmission to pass through a lower gear, in accordance with the invention .
  • the driver of a motor vehicle equipped with an automatic gearbox needs in certain circumstances to have a significant acceleration, and expresses this need by pressing more or less strongly on his accelerator pedal, depending on the urgency of the situation. Since the intensity of the desired acceleration influences not only the desired pedal position, but also the speed of its action, the invention proposes to take into consideration simultaneously the position of the pedal, and its speed. push to control shift to a lower gear.
  • the computer of the automatic gearbox of the vehicle therefore uses a first item of information relating to the position of the pedal, and a second item of information relating to its speed of depressing.
  • a strategy allowing him to decide to impose on the transmission the shift to a lower gear, or not to impose this shift.
  • the ordering process proposed results in an internal control signal from the gearbox computer, called a “kick signal”, which can take two values (1, or 0), corresponding respectively to the acceptance or refusal of the shift to a lower gear.
  • the information used can be representative of the linear displacement of the pedal, or of its linear displacement.
  • the computer compares two variables related to the position of the pedal, with two preset authorization thresholds.
  • a first threshold defines the pedal position from which the downshift is engaged, while the second defines a depressing speed threshold which is compared by the computer to the derivative of the pedal position, before authorizing the shift. on a lower gear.
  • the instantaneous position of the pedal can for example be expressed in degrees of pedal angle relative to its rest position.
  • the first and the second threshold will then be established respectively in degrees and in degrees per second.
  • the instantaneous position of the pedal will for example be expressed in millimeters deviation from its rest position, and the two thresholds selected, will be established respectively in millimeters and in millimeters per second.
  • the control operations of the computer are carried out by following the following loop.
  • the "kick signal" from the computer receives the value "refused” (0).
  • the value "accepted” (1) is adopted as soon as the deviation of the pedal from its position of rest is greater than the first threshold, and that the value of its penetration speed is greater than the second.
  • the value (1) is kept until the difference in position of the pedal becomes less than the first threshold.

Abstract

The invention concerns a method for controlling the passage of an automatic gearbox to a reduced gear ratio using the accelerator pedal (1) of a vehicle, characterised in that it relies on the simultaneous exploitation of a first information linked to the position of the pedal, and a second information linked to the speed of its depression by the driver.

Description

PROCEDE DE COMMANDE DU PASSAGE D'UNE TRANSMISSION AUTOMATIQUE SUR UN RAPPORT METHOD FOR CONTROLLING THE TRANSFER OF AN AUTOMATIC TRANSMISSION ON A GEAR
INFERIEURINFERIOR
La présente invention concerne la commande des transmissions automatiques à rapports étages. Plus précisément, elle a pour objet un procédé de commande du passage d'une transmission automatique sur un rapport inférieur à l'aide de la pédale d'accélérateur.The present invention relates to the control of automatic transmissions with stage ratios. More specifically, it relates to a method for controlling the passage of an automatic transmission to a lower gear using the accelerator pedal.
Les boîtes de vitesses automatiques pilotées électroniquement disposent généralement d'une commande de rétrogradage par enfoncement de la pédale d'accélérateur, permettant au conducteur de forcer la boîte à rétrograder jusqu'au rapport le plus faible, dans une limite déterminée par le fonctionnement du moteur.Electronically-controlled automatic gearboxes generally have a downshift control by depressing the accelerator pedal, allowing the driver to force the gearbox to downshift to the lowest gear, within a limit determined by engine operation .
Selon une disposition classique, le conducteur demande ces rétrogradages en appuyant à fond sur la pédale d'accélérateur, de façon à dépasser un point dur. Le passage de ce point dur ferme, un contact électrique, appelé "rétro-contact" , qui informe l'unité de pilotage électronique de la boîte, de la demande de rétrogradage.According to a conventional arrangement, the driver requests these downshifts by depressing the accelerator pedal fully, so as to pass a hard point. The passage of this hard point closes, an electrical contact, called "retro-contact", which informs the electronic control unit of the gearbox, of the demotion request.
Lorsque le rétro-contact intervient en fin de course de la pédale, le conducteur est contraint d'accélérer "pied à fond" , pour obtenir un rétrogradage.When the retro-contact occurs at the end of the pedal stroke, the driver is forced to accelerate "fully" to obtain a downshift.
D'une façon générale, le système du rétro-contact, ou "kick-down" , à point dur en fin de course présente l'inconvénient d'être relativement inconfortable pour le conducteur, de sorte qu'il est peu ou rarement utilisé.In general, the feedback system, or "kick-down", hard point at the end of the race has the disadvantage of being relatively uncomfortable for the driver, so that it is rarely or rarely used.
La présente invention vise à mettre en oeuvre une fonction de rétrogradage pouvant intervenir en différents points de la course de l'accélérateur, et sans incidence sur la résistance à l'enfoncement de celle-ci.The present invention aims to implement a downshift function which can intervene at different points of the accelerator stroke, and without affecting the resistance to depression thereof.
Elle propose dans ce but d'exploiter simultanément une première information liée à la position de la pédale, et une seconde information liée à sa vitesse d'enfoncement par le conducteur.To this end, it proposes to simultaneously use a first piece of information linked to the position of the pedal, and a second piece of information linked to its speed of depressing by the driver.
Selon un premier mode de réalisation de l'invention, la première information est relative à l'angle d'inclinaison de la pédale par rapport à sa position de repos, et la seconde information est relative à sa vitesse angulaire de déplacement à l'écart de sa position de repos.According to a first embodiment of the invention, the first information relates to the angle of inclination of the pedal relative to its rest position, and the second information relates to its angular speed of displacement away from its rest position.
Selon un second mode de réalisation de l'invention, la première information est relative à l'écart en distance de la pédale par rapport à sa position de repos, et la seconde information est relative à sa vitesse linéaire de déplacement.According to a second embodiment of the invention, the first item of information relates to the distance in distance of the pedal from its rest position, and the second item of information relates to its linear speed of movement.
D'autres caractéristiques et avantages de l'invention apparaîtront clairement à la lecture de la description suivante d'un mode de réalisation particulier de celle-ci, en liaison avec les dessins annexés, sur lesquels : - la figure unique illustre le procédé de l'inventionOther characteristics and advantages of the invention will appear clearly on reading the following description of a particular embodiment thereof, in conjunction with the appended drawings, in which: - the single figure illustrates the process of the invention
Sur - la figure 1 , on a représenté schématiquement une pédale d'accélérateur 1 et le calculateur électronique 2 d'une boîte de vitesses automatique, auquel elle transmet les informations nécessaires au passage de la transmission sur un rapport inférieur, conformément à l'invention.In - Figure 1, there is shown schematically an accelerator pedal 1 and the electronic computer 2 of an automatic gearbox, to which it transmits the information necessary for the transmission to pass through a lower gear, in accordance with the invention .
Comme indiqué plus haut, le conducteur d'un véhicule automobile équipé d'une boîte de vitesses automatique a besoin dans certaines circonstances de disposer d'une accélération importante, et exprime ce besoin en appuyant plus ou moins fortement sur sa pédale d'accélérateur, selon le caractère d'urgence de la situation. Etant donné que l'intensité de l'accélération souhaitée influe non seulement sur la position de pédale recherchée, mais également sur la rapidité de son action, l'invention propose de prendre en considération simultanément la position de la pédale, et sa vitesse d'enfoncement pour commander le passage sur un rapport inférieur.As indicated above, the driver of a motor vehicle equipped with an automatic gearbox needs in certain circumstances to have a significant acceleration, and expresses this need by pressing more or less strongly on his accelerator pedal, depending on the urgency of the situation. Since the intensity of the desired acceleration influences not only the desired pedal position, but also the speed of its action, the invention proposes to take into consideration simultaneously the position of the pedal, and its speed. push to control shift to a lower gear.
Conformément à l'invention, le calculateur de la boîte de vitesses automatique du véhicule exploite donc une première information relative à la position de la pédale, et une seconde information, relative à sa vitesse d'enfoncement. Sur la base de ces signaux, il développe une stratégie, lui permettant de décider d'imposer à la transmission le passage sur un rapport inférieur, ou de ne pas imposer ce passage. En d'autres termes, le procédé de commande proposé, se traduit par un signal de commande interne du calculateur de la boîte, appelé «signal kick», qui peut prendre deux valeurs (1 , ou 0), correspondant respectivement à l'acceptation ou au refus du passage sur un rapport inférieur.According to the invention, the computer of the automatic gearbox of the vehicle therefore uses a first item of information relating to the position of the pedal, and a second item of information relating to its speed of depressing. On the basis of these signals, he develops a strategy, allowing him to decide to impose on the transmission the shift to a lower gear, or not to impose this shift. In other words, the ordering process proposed, results in an internal control signal from the gearbox computer, called a “kick signal”, which can take two values (1, or 0), corresponding respectively to the acceptance or refusal of the shift to a lower gear.
Conformément à l'invention, les informations exploitées peuvent être représentatives du déplacement linéaire de la pédale, ou de son déplacement linéaire. Dans les deux cas, le calculateur compare deux variables liées à la position de la pédale, à deux seuils d'autorisation préétablis. Un premier seuil définit la position de la pédale à partir de laquelle le rétrogradage est enclenché, tandis que le second définit un seuil de vitesse d'enfoncement qui est comparé par le calculateur à la dérivée de la position pédale, avant d'autoriser le passage sur un rapport inférieur.In accordance with the invention, the information used can be representative of the linear displacement of the pedal, or of its linear displacement. In both cases, the computer compares two variables related to the position of the pedal, with two preset authorization thresholds. A first threshold defines the pedal position from which the downshift is engaged, while the second defines a depressing speed threshold which is compared by the computer to the derivative of the pedal position, before authorizing the shift. on a lower gear.
Si le critère de déplacement retenu se rapporte à la position angulaire de la pédale, la position instantanée de la pédale peut par exemple être exprimée en degrés d'angle pédale par rapport à sa position de repos. Le premier et le second seuil seront alors établis respectivement en degrés et en degrés par seconde.If the displacement criterion adopted relates to the angular position of the pedal, the instantaneous position of the pedal can for example be expressed in degrees of pedal angle relative to its rest position. The first and the second threshold will then be established respectively in degrees and in degrees per second.
Si ce critère concerne la position linéaire de la pédale sur sa course, la position instantanée de la pédale sera par exemple exprimée en millimètres d'écart par rapport à sa position de repos, et les deux seuils retenus, seront établis respectivement en millimètres et en millimètres par seconde. Les opérations de contrôle du calculateur s'effectuent en suivant la boucle suivante. Lors de l'initialisation du procédé, le «signal kick» du calculateur reçoit la valeur "refusé" (0). En donnant un signe positif à la dérivée de la position pidale dans le sens de l'enfoncement de celle-ci, la valeur «accepté» (1) est adoptée dès que l'écart de la pédale vis-à-vis de sa position de repos est supérieur au premier seuil, et que la valeur de sa vitesse d'enfoncement est supérieure au second. Conformément à l'invention, la valeur (1) est conservée jusqu'à ce que l'écart en position de la pédale redevienne inférieur au premier seuil.If this criterion relates to the linear position of the pedal over its travel, the instantaneous position of the pedal will for example be expressed in millimeters deviation from its rest position, and the two thresholds selected, will be established respectively in millimeters and in millimeters per second. The control operations of the computer are carried out by following the following loop. When the process is initialized, the "kick signal" from the computer receives the value "refused" (0). By giving a positive sign to the derivative of the pedal position in the direction of depressing it, the value "accepted" (1) is adopted as soon as the deviation of the pedal from its position of rest is greater than the first threshold, and that the value of its penetration speed is greater than the second. According to the invention, the value (1) is kept until the difference in position of the pedal becomes less than the first threshold.
Bien entendu, tant que le signal conserve sa valeur d'acceptation, les passages sur des rapports inférieurs sont déclenchés, pour autant que la charge du moteur le permette. En particulier, si la demande d'accélération du conducteur nécessite plusieurs rétrogradages, les mesures proposées, garantissent leur déroulement successif dans les meilleures conditions de confort, sans manoeuvre supplémentaire du conducteur. D'une manière générale, l'efficacité des mesures proposées, permet d'éviter tout rétrogradage intempestif, et leur transparence vis-à-vis de l'utilisateur confèrent au procédé de commande de l'invention un intérêt considérable. Of course, as long as the signal retains its acceptance value, changes to lower gears are triggered, provided that the load of the engine allows it. In particular, if the driver's acceleration request requires several downshifts, the measures proposed guarantee their successive progress in the best conditions of comfort, without additional maneuver by the driver. In general, the effectiveness of the proposed measures makes it possible to avoid any untimely demotion, and their transparency vis-à-vis the user give the control method of the invention considerable interest.

Claims

REVENDICATIONS
[1] Procédé de commande du passage d'une transmission automatique sur un rapport inférieur reposant sur l'élaboration d'un signal binaire d'acceptation ou de refus de ce passage à l'aide de la pédale d'accélérateur (1) du véhicule, caractérisé en ce qu'il repose sur l'exploitation simultanée d'une première information liée à la position de la pédale, et une seconde information liée à sa vitesse d'enfoncement par le conducteur.[1] Method for controlling the shift of an automatic transmission to a lower gear based on the development of a binary signal of acceptance or refusal of this shift using the accelerator pedal (1) of the vehicle, characterized in that it is based on the simultaneous use of first information linked to the position of the pedal, and second information linked to its depression speed by the driver.
[2] Procédé de commande selon la revendication 1, caractérisé en ce que la première information est relative à l'inclinaison de la pédale (1) par rapport à sa position de repos, et en ce que la seconde information est relative à sa vitesse angulaire de déplacement à l'écart de sa position de repos.[2] Control method according to claim 1, characterized in that the first information relates to the inclination of the pedal (1) relative to its rest position, and in that the second information relates to its speed angular movement away from its rest position.
[3] Procédé de commande selon la revendication 1 , caractérisé en ce que la première information est relative à l'écart en distance de la pédale (1) par rapport à sa position de repos, et en ce que la seconde information est relative à sa vitesse linéaire de déplacement.[3] Control method according to claim 1, characterized in that the first information relates to the distance difference of the pedal (1) relative to its rest position, and in that the second information relates to its linear speed of movement.
[4] Procédé de commande selon l'une des revendications précédentes, caractérisé en ce que le passage sur un rapport inférieur est accepté lorsque l'écart en position de la pédale (1), et sa vitesse d'enfoncement sont supérieurs à un premier et à un second seuil préétablis. [4] Control method according to one of the preceding claims, characterized in that the shift to a lower gear is accepted when the difference in position of the pedal (1), and its depression speed are greater than a first and at a second pre-established threshold.
[5] Procédé de commande selon la revendication 4, caractérisé en ce que l'ordre de passage reste valide tant que l'écart de position reste supérieur au premier seuil.[5] Control method according to claim 4, characterized in that the passage order remains valid as long as the position difference remains greater than the first threshold.
[6] Procédé de commande selon l'une des revendications précédentes, caractérisé en ce que les informations sont exploitées par le calculateur (2) de la transmission automatique du véhicule.[6] Control method according to one of the preceding claims, characterized in that the information is used by the computer (2) of the vehicle's automatic transmission.
[7] Procédé de commande selon l'une des revendications précédentes, caractérisé en ce que le signal de commande est un signal binaire d'acceptation ou de refus du passage sur un rapport inférieur.[7] Control method according to one of the preceding claims, characterized in that the control signal is a binary signal of acceptance or refusal of shifting to a lower gear.
[8] procédé de commande selon l'une des revendications précédentes, caractérisé en ce qu'il peut imposer plusieurs rétrogradages successifs. [8] control method according to one of the preceding claims, characterized in that it can impose several successive downshifts.
PCT/FR1997/001906 1996-10-25 1997-10-24 Method for controlling the passage of an automatic gearbox to a reduced gear ratio WO1998019082A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR96/13034 1996-10-25
FR9613034A FR2755205B1 (en) 1996-10-25 1996-10-25 METHOD FOR CONTROLLING THE TRANSFER OF AN AUTOMATIC TRANSMISSION ON A LOWER GEAR

Publications (1)

Publication Number Publication Date
WO1998019082A1 true WO1998019082A1 (en) 1998-05-07

Family

ID=9497027

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1997/001906 WO1998019082A1 (en) 1996-10-25 1997-10-24 Method for controlling the passage of an automatic gearbox to a reduced gear ratio

Country Status (2)

Country Link
FR (1) FR2755205B1 (en)
WO (1) WO1998019082A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005056343A1 (en) 2003-12-02 2005-06-23 Renault S.A.S. System for displaying a recommended gearbox ratio

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5083480A (en) * 1988-11-28 1992-01-28 Nissan Motor Coompany, Limited Shift control system for automotive automatic power transmission with kick-down control according to prediction of demanded engine load
US5233523A (en) * 1990-12-21 1993-08-03 Ford Motor Company Compensation for delay of scheduled gearshifts in automatic transmissions
US5319998A (en) * 1990-11-15 1994-06-14 Toyota Jidosha Kabushiki Kaisha Method for downshifting of automatic transmission with discrimination of magnitude of need therefor
JPH06221415A (en) * 1991-08-12 1994-08-09 Aisin Aw Co Ltd Automatic speed change point changing speed change control device using throttle opening speed and acceleration
WO1995012078A1 (en) * 1993-10-25 1995-05-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Speed change control method for an automatic transmission
WO1996028670A1 (en) * 1995-03-15 1996-09-19 Automotive Products Plc Vehicle transmissions
JPH09166207A (en) * 1995-12-18 1997-06-24 Unisia Jecs Corp Control device for transmission
JPH09166216A (en) * 1995-12-14 1997-06-24 Unisia Jecs Corp Control device for transmission

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5083480A (en) * 1988-11-28 1992-01-28 Nissan Motor Coompany, Limited Shift control system for automotive automatic power transmission with kick-down control according to prediction of demanded engine load
US5319998A (en) * 1990-11-15 1994-06-14 Toyota Jidosha Kabushiki Kaisha Method for downshifting of automatic transmission with discrimination of magnitude of need therefor
US5233523A (en) * 1990-12-21 1993-08-03 Ford Motor Company Compensation for delay of scheduled gearshifts in automatic transmissions
JPH06221415A (en) * 1991-08-12 1994-08-09 Aisin Aw Co Ltd Automatic speed change point changing speed change control device using throttle opening speed and acceleration
WO1995012078A1 (en) * 1993-10-25 1995-05-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Speed change control method for an automatic transmission
US5624351A (en) * 1993-10-25 1997-04-29 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Speed change control method for an automatic transmission
WO1996028670A1 (en) * 1995-03-15 1996-09-19 Automotive Products Plc Vehicle transmissions
JPH09166216A (en) * 1995-12-14 1997-06-24 Unisia Jecs Corp Control device for transmission
JPH09166207A (en) * 1995-12-18 1997-06-24 Unisia Jecs Corp Control device for transmission

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 594 (M - 1703) 14 November 1994 (1994-11-14) *
PATENT ABSTRACTS OF JAPAN vol. 097, no. 010 31 October 1997 (1997-10-31) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005056343A1 (en) 2003-12-02 2005-06-23 Renault S.A.S. System for displaying a recommended gearbox ratio

Also Published As

Publication number Publication date
FR2755205A1 (en) 1998-04-30
FR2755205B1 (en) 1998-11-27

Similar Documents

Publication Publication Date Title
EP2111515B1 (en) Method and device for vehicle driving assistance
US5603673A (en) Change gear control device using acceleration and gear ratio as parameters for automatic transmission in a motor vehicle and the method therefor
FR2731659A1 (en) SPEED LIMITATION METHOD AND DEVICE FOR MOTOR VEHICLES
FR2721367A1 (en) Device and method for controlling an automatic gearshift device of a gearbox of a motor vehicle.
KR960004283B1 (en) Change gear control device and the method therefor
FR2870791A1 (en) SYSTEM FOR CONTROLLING KINETIC VEHICLE CHARACTERISTICS
FR2898097A1 (en) DEVICE AND METHOD FOR CONTROLLING VEHICLE
FR2844227A1 (en) Vehicle speed limiting method involves determining limit value for output quantity of drive unit, based on determined maximum permissible acceleration and by utilizing vehicle dynamics equation
EP0991880A1 (en) Method for controlling automatic transmission downshift phases
WO1998019082A1 (en) Method for controlling the passage of an automatic gearbox to a reduced gear ratio
WO2004088176A1 (en) Automatic speed-change control device
EP2019769B1 (en) Method and device for controlling the displacement of a vehicle at low speed
FR2697784A1 (en) Controller augmenting slowing of vehicle travelling in neutral - uses monitoring of gear ratio and road speed and increases engine speed to sustain lubrication if vehicle is in neutral
JP3492843B2 (en) Automatic transmission for vehicles
FR2779793A1 (en) METHOD AND DEVICE FOR AUTOMATIC ADAPTATION OF GEARBOXES IN A TURNING SITUATION
WO2005080123A1 (en) Device and method for driving a motor vehicle traction chain whose transmission member has an automatically changeable gearing reduction mode and a motor vehicle provided with said device
US6871130B2 (en) Method of controlling an automatic transmission
FR2780002A1 (en) VEHICLE DRIVE SYSTEM
JP3463527B2 (en) Control device for continuously variable transmission
WO2003004910A1 (en) Method for controlling an automatic gearbox according to a road profile
EP1034962B1 (en) Apparatus and method for control of inter-vehicle spacing
FR2746887A1 (en) SYSTEM FOR DETERMINING VARIATIONS IN THE RATIO OF AN AUTOMATIC TRANSMISSION
EP1771673A1 (en) Method for controlling gear change during shifting rule or variogram switching
FR2774955A1 (en) CLUTCH CONTROL SYSTEM
GB2311571A (en) Method of adjusting the gear ratio of a continuously adjustable transmission

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP KR PL 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

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application