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WO2009007594A2 - Start assistance method and device for a vehicle stopped on an inclined surface - Google Patents

Start assistance method and device for a vehicle stopped on an inclined surface Download PDF

Info

Publication number
WO2009007594A2
WO2009007594A2 PCT/FR2008/051143 FR2008051143W WO2009007594A2 WO 2009007594 A2 WO2009007594 A2 WO 2009007594A2 FR 2008051143 W FR2008051143 W FR 2008051143W WO 2009007594 A2 WO2009007594 A2 WO 2009007594A2
Authority
WO
WIPO (PCT)
Prior art keywords
vehicle
slope
assistance
engine
speed
Prior art date
Application number
PCT/FR2008/051143
Other languages
French (fr)
Other versions
WO2009007594A3 (en
Inventor
Jean-Marie Aubert
Laurent Le Garff
Original Assignee
Renault S.A.S.
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 S.A.S. filed Critical Renault S.A.S.
Publication of WO2009007594A2 publication Critical patent/WO2009007594A2/en
Publication of WO2009007594A3 publication Critical patent/WO2009007594A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/10—Introducing corrections for particular operating conditions for acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F02D2200/602—Pedal position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/702—Road conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/21—Control of the engine output torque during a transition between engine operation modes or states

Definitions

  • the present invention relates to assistance for starting a stopped vehicle on a sloping surface. It aims to improve the start-up or "take-off" service of the vehicle from the stop, under all the slope conditions encountered, by controlling pollutant emissions.
  • the present invention relates to an assistance method and a corresponding device.
  • the engine injection computer does not integrate the slope of the road and the vehicle load in its injection settings, it may indeed generate more pollutant emissions than necessary, to meet the demand for fuel. torque expressed during take off by the accelerator pedal, especially on the flat or downhill.
  • the publication FR 2 858 032 discloses a hill start assist system capable of determining a target torque value for take-off, and to impose this target on the computer, when the will to take off is detected, from information received from sensors associated with the accelerator pedal and the clutch.
  • the present invention aims to overcome the development of a substituted torque target, at startup, the torque normally established from the driver demand.
  • the slope of the road is measured on the basis of existing information, transmitted by an on-board unit on board the vehicle.
  • the proposed device essentially comprises:
  • a slope sensor for measuring the slope of the surface on which the vehicle is located
  • FIG. 1 illustrates the proposed device
  • FIG. 1 diagrammatically shows the engine of the vehicle 1, the drive wheels 2 thereof, and the control computer 3 of the engine 1. Also appear the accelerator pedal 4, responsible for the control of the gases , a wheel speed sensor 6, and a slope sensor 7.
  • the assistance device proposed by the invention essentially consists of:
  • the slope sensor 7 for measuring the slope of the surface on which the vehicle is located, which belongs to the automatic parking brake system (not shown), embarked on the vehicle,
  • the proposed strategy comprises a first step A, determining the driver's will as a function of the throttle control, and the speed of the vehicle.
  • a second step B is followed to determine the fuel flow injected according to this will.
  • a correction factor is established in C, according to a slope information and a vehicle speed information. This correction factor is stored in memory.
  • D the flow rate calculated in step B is corrected according to this correction factor. This correction is independent of the degree of coupling between the engine and the drive wheels of the vehicle, that is to say the position of the clutch.
  • the slope information is preferably measured on the basis of existing information, transmitted by an on-board vehicle, such as the vehicle's automatic parking brake calculator, which has its own means of slope measurement: under these conditions, it is not necessary to provide a specific slope sensor.
  • the slope information is used in the engine control strategy as an adjustment parameter, so as to reduce the fuel flow on the flat or downhill, for the same pedal position. This measure guarantees a satisfactory start-up performance, even for heavy loads, while reducing fuel flow and polluting emissions on the flat or downhill.
  • the implementation of the process is not related to the braking system or the clutch system of the vehicle, and that the reduction of pollutant emissions that it allows, can have a sufficient impact on the loading of the particulate filter, to be able to space the regeneration phases thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention relates to a method for the start assistance of a vehicle stopped on an inclined surface and including a thermal engine (1), characterised in that, for a given position of the accelerator pedal (4), it comprises applying on the amount of fuel injected into the cylinders of the engine (1), a correction based on the measure of the slope of the road and the speed of the vehicle wheels (2).

Description

PROCEDE ET DISPOSITIF D 'ASSISTANCE AU DEMARRAGE D'UN VEHICULE ARRETE SUR UNE SURFACE EN PENTE METHOD AND DEVICE FOR ASSISTING THE STARTING OF A VEHICLE STOPPED ON A SLOPED SURFACE
La présente invention concerne l'assistance au démarrage d'un véhicule arrêté sur une surface en pente. Elle vise à améliorer la prestation de démarrage ou « décollage » du véhicule à partir de l'arrêt, dans toutes les conditions de pente rencontrées, en maîtrisant les émissions polluantes. Cette invention concerne un procédé d'assistance, ainsi qu'un dispositif correspondant.The present invention relates to assistance for starting a stopped vehicle on a sloping surface. It aims to improve the start-up or "take-off" service of the vehicle from the stop, under all the slope conditions encountered, by controlling pollutant emissions. The present invention relates to an assistance method and a corresponding device.
La gestion de la phase de décollage d'un véhicule dans des circonstances particulières de forte charge, et/ ou de forte côte, pose une double problématique d'agrément de conduite et de limitation des émissions polluantes, qui sont néfastes, non seulement pour l'environnement, mais également pour la pérennité des organes de dépollution embarqués à bord du véhicule, tels que le filtre à particules. Tant que le calculateur d'injection du moteur n'intègre pas la pente de la route et la charge du véhicule dans ses réglages d'injection, il risque en effet de générer des émissions polluantes plus importantes que nécessaires, pour satisfaire à la demande de couple exprimée au décollage par la pédale d'accélérateur, en particulier sur le plat ou en descente.The management of the takeoff phase of a vehicle in particular circumstances of high load, and / or high coast, poses a dual problem of driving pleasure and limiting pollutant emissions, which are harmful, not only for the environment, but also for the durability of the abatement devices aboard the vehicle, such as the particulate filter. As long as the engine injection computer does not integrate the slope of the road and the vehicle load in its injection settings, it may indeed generate more pollutant emissions than necessary, to meet the demand for fuel. torque expressed during take off by the accelerator pedal, especially on the flat or downhill.
Par la publication FR 2 858 032, on connaît un système d'assistance au démarrage en côte, capable de déterminer une valeur de couple cible pour le décollage, et d'imposer cette cible au calculateur, lorsque la volonté de décoller est détectée, à partir d'informations reçues de capteurs associés à la pédale d'accélérateur et à l'embrayage. La présente invention vise à s'affranchir de l'élaboration d'une cible de couple substituée, au démarrage, au couple normalement établi à partir de la demande conducteur.The publication FR 2 858 032 discloses a hill start assist system capable of determining a target torque value for take-off, and to impose this target on the computer, when the will to take off is detected, from information received from sensors associated with the accelerator pedal and the clutch. The present invention aims to overcome the development of a substituted torque target, at startup, the torque normally established from the driver demand.
Elle propose d'appliquer sur la quantité de carburant injecté dans les cylindres du moteur, une correction basée sur une mesure de la pente de la route, et de la vitesse des roues du véhicule.It proposes to apply on the quantity of fuel injected into the cylinders of the engine, a correction based on a measurement of the slope of the road, and the speed of the wheels of the vehicle.
De préférence, la pente de la route, est mesurée sur la base d'une information existante, transmise par un organe embarqué à bord du véhicule.Preferably, the slope of the road is measured on the basis of existing information, transmitted by an on-board unit on board the vehicle.
Le dispositif proposé comporte essentiellement :The proposed device essentially comprises:
- un capteur de pente pour mesurer la pente de la surface sur laquelle se trouve le véhicule,a slope sensor for measuring the slope of the surface on which the vehicle is located,
- un capteur de commande des gaz permettant de détecter la volonté du conducteur,a gas control sensor making it possible to detect the driver's will,
- un capteur de vitesse du véhicule,- a vehicle speed sensor,
- et un calculateur de contrôle moteur, déterminant la quantité de carburant à injecter dans les cylindres du moteur en fonction de la pente, de la volonté du conducteur, et de la vitesse du véhicule.and an engine control computer, determining the quantity of fuel to be injected into the engine cylinders as a function of the gradient, the driver's will, and the speed of the vehicle.
D'autres caractéristiques et avantages de l'invention, ressortiront clairement de la description suivante d'un mode de réalisation non limitatif de celle- ci, en se reportant aux dessins annexés, sur lesquels, - la figure 1 illustre le dispositif proposé, etOther features and advantages of the invention will become apparent from the following description of a non-limiting embodiment thereof, with reference to the accompanying drawings, in which, FIG. 1 illustrates the proposed device, and
- la figure 2 se rapporte au procédé associé- Figure 2 relates to the associated process
Sur la figure 1, on a représenté schématiquement , le moteur du véhicule 1, les roues motrices 2 de celui-ci, et le calculateur de contrôle 3 du moteur 1. Apparaissent également la pédale d'accélérateur 4, responsable de la commande des gaz, un capteur de vitesse des roues 6, et un capteur de pente 7.FIG. 1 diagrammatically shows the engine of the vehicle 1, the drive wheels 2 thereof, and the control computer 3 of the engine 1. Also appear the accelerator pedal 4, responsible for the control of the gases , a wheel speed sensor 6, and a slope sensor 7.
Comme indiqué ci-dessus, et conformément à ce schéma, le dispositif d'assistance proposé par l'invention se compose en effet essentiellement :As indicated above, and in accordance with this diagram, the assistance device proposed by the invention essentially consists of:
- du capteur de pente 7, pour mesurer la pente de la surface sur laquelle se trouve le véhicule, qui appartient au système de frein de parking automatique (non représenté), embarqué sur le véhicule,the slope sensor 7, for measuring the slope of the surface on which the vehicle is located, which belongs to the automatic parking brake system (not shown), embarked on the vehicle,
- d'un capteur de commande des gaz associé à la position de la pédale 4, où d'un autre élément de commande tel que le boîtier papillon d'admission, permettant de détecter la volonté du conducteur, - du capteur de vitesse de roues 6, déterminant la vitesse de déplacement du véhicule, qui appartient par exemple au système de frein de parking automatique embarqué sur le véhicule, et du calculateur de contrôle moteur 3, qui détermine la quantité de carburant à injecter dans les cylindres du moteur en fonction de la pente, de la volonté du conducteur, et de la vitesse du véhicule.- A throttle sensor associated with the position of the pedal 4, where another control element such as the throttle valve housing, for detecting the will of the driver, - the wheel speed sensor 6, determining the speed of movement of the vehicle, which belongs for example to the automatic parking brake system on board the vehicle, and the engine control computer 3, which determines the amount of fuel to be injected into the engine cylinders as a function of the slope, the will of the driver, and the speed of the vehicle.
Un tel dispositif, permet au calculateur de contrôle moteur 3, d'utiliser l'information « pente du véhicule », afin d'adapter sa stratégie de contrôle moteur. Le calculateur du contrôle moteur détermine ainsi la quantité de carburant « corrigée », en fonction de la pente de la route, et de la vitesse du véhicule. Conformément à la figure 2, la stratégie proposée comprend une première étape A, de détermination de la volonté du conducteur en fonction de la commande des gaz, et de la vitesse du véhicule. Suit une deuxième étape B, de détermination du débit de carburant injecté en fonction de cette volonté. Un facteur de correction est établi en C, selon une information pente et une information vitesse du véhicule. Ce facteur de correction est mis en mémoire. En D, le débit calculé à l'étape B est corrigé en application de ce facteur de correction. Cette correction est indépendante du degré d'accouplement entre le moteur et les roues motrices du véhicule, c'est- à-dire de la position de l'embrayage.Such a device allows the engine control computer 3 to use the information "slope of the "vehicle", in order to adapt its engine control strategy. The engine control computer thus determines the amount of fuel "corrected", depending on the slope of the road, and the speed of the vehicle. According to FIG. 2, the proposed strategy comprises a first step A, determining the driver's will as a function of the throttle control, and the speed of the vehicle. A second step B is followed to determine the fuel flow injected according to this will. A correction factor is established in C, according to a slope information and a vehicle speed information. This correction factor is stored in memory. In D, the flow rate calculated in step B is corrected according to this correction factor. This correction is independent of the degree of coupling between the engine and the drive wheels of the vehicle, that is to say the position of the clutch.
Comme indiqué plus haut, l'information pente est de préférence mesurée sur la base d'une information existante, transmise par un organe embarqué à bord du véhicule, telle que le calculateur de frein de parking automatique du véhicule, qui comporte ses propres moyens de mesure de pente : dans ces conditions, il n'est pas nécessaire de prévoir un capteur de pente spécifique. L'information pente, est utilisée dans la stratégie de contrôle moteur, comme un paramètre d'ajustement, de manière à réduire le débit de carburant sur le plat ou en descente, pour une même position pédale. Cette mesure garantit une prestation de démarrage en côte satisfaisante, même pour de fortes charges, tout en réduisant le débit de carburant et les émissions polluantes sur le plat ou en descente. Enfin, il faut signaler que la mise en ouvre du procédé n'est liée, ni au système de freinage, ni au système d'embrayage du véhicule, et que la réduction des émissions polluantes qu'il autorise, peut avoir un impact suffisant sur le chargement du filtre à particules, pour pouvoir espacer les phases de régénération de celui-ci. As indicated above, the slope information is preferably measured on the basis of existing information, transmitted by an on-board vehicle, such as the vehicle's automatic parking brake calculator, which has its own means of slope measurement: under these conditions, it is not necessary to provide a specific slope sensor. The slope information is used in the engine control strategy as an adjustment parameter, so as to reduce the fuel flow on the flat or downhill, for the same pedal position. This measure guarantees a satisfactory start-up performance, even for heavy loads, while reducing fuel flow and polluting emissions on the flat or downhill. Finally, it should be noted that the implementation of the process is not related to the braking system or the clutch system of the vehicle, and that the reduction of pollutant emissions that it allows, can have a sufficient impact on the loading of the particulate filter, to be able to space the regeneration phases thereof.

Claims

REVENDICATIONS
1. Procédé d'assistance au démarrage d'un véhicule arrêté sur une surface en pente, équipé d'un moteur thermique (1), caractérisé en ce que pour une position de pédale d'accélérateur (4) donnée, on applique sur la quantité de carburant injecté dans les cylindres du moteur (1) une correction basée sur une mesure de la pente de la route et de la vitesse des roues (2) du véhicule.1. A method of assisting the starting of a stopped vehicle on a sloping surface, equipped with a heat engine (1), characterized in that for a given accelerator pedal position (4), is applied to the quantity of fuel injected into the engine cylinders (1) a correction based on a measurement of the road gradient and the speed of the wheels (2) of the vehicle.
2. Procédé d'assistance selon la revendication 1, caractérisé en ce que le calculateur du contrôle moteur (3) détermine la quantité de carburant à injecter en fonction de la pente de la route, et de la vitesse du véhicule.2. A method of assistance according to claim 1, characterized in that the engine control computer (3) determines the amount of fuel to be injected according to the slope of the road, and the speed of the vehicle.
3. Procédé d'assistance selon la revendication 1 ou 2, caractérisé en ce que le facteur de correction du débit de carburant injecté est indépendant du degré d'accouplement entre le moteur (1) et les roues motrices (2) du véhicule.3. A method of assistance according to claim 1 or 2, characterized in that the correction factor injected fuel flow is independent of the degree of coupling between the engine (1) and the drive wheels (2) of the vehicle.
4. Procédé d'assistance selon la revendication 3, caractérisé en ce que le facteur de correction est mis en mémoire .4. Assistance method according to claim 3, characterized in that the correction factor is stored.
5. Procédé d'assistance selon l'une des revendications précédentes, caractérisé en ce que la pente de la route, est mesurée sur la base d'une information existante, transmise par un organe embarqué à bord du véhicule. 5. Assistance method according to one of the preceding claims, characterized in that the slope of the road, is measured on the basis of existing information, transmitted by an on-board unit on board the vehicle.
6. Procédé d'assistance selon la revendication 5, caractérisé en ce que l'information sur la pente de la route est transmise au calculateur de contrôle moteur par un calculateur de frein de parking automatique du véhicule.6. A method of assistance according to claim 5, characterized in that the information on the slope of the road is transmitted to the engine control computer by an automatic vehicle parking brake calculator.
7. Dispositif d'assistance au démarrage de véhicule équipé d'un moteur thermique, caractérisé en ce qu'il comprend :7. Vehicle assistance assistance device equipped with a heat engine, characterized in that it comprises:
- un capteur de pente (7) pour mesurer la pente de la surface sur laquelle se trouve le véhicule,a slope sensor (7) for measuring the slope of the surface on which the vehicle is located,
- un capteur de commande des gaz permettant de détecter la volonté du conducteur,a gas control sensor making it possible to detect the driver's will,
- un capteur de vitesse du véhicule, et un calculateur de contrôle moteur (3) déterminant la quantité de carburant à injecter dans les cylindres du moteur en fonction de la pente, de la volonté du conducteur, et de la vitesse du véhicule.- A vehicle speed sensor, and an engine control computer (3) determining the amount of fuel to be injected into the engine cylinders according to the slope, the driver's will, and the speed of the vehicle.
8. Dispositif d'assistance selon la revendication 7, caractérisé en ce que le capteur de pente (7) appartient au système de frein de parking automatique embarqué sur le véhicule. 8. Assist device according to claim 7, characterized in that the slope sensor (7) belongs to the automatic parking brake system embedded on the vehicle.
PCT/FR2008/051143 2007-07-12 2008-06-25 Start assistance method and device for a vehicle stopped on an inclined surface WO2009007594A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0756436 2007-07-12
FR0756436A FR2918714B1 (en) 2007-07-12 2007-07-12 METHOD AND DEVICE FOR ASSISTING THE STARTING OF A VEHICLE STOPPED ON A SLOPED SURFACE.

Publications (2)

Publication Number Publication Date
WO2009007594A2 true WO2009007594A2 (en) 2009-01-15
WO2009007594A3 WO2009007594A3 (en) 2009-10-15

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PCT/FR2008/051143 WO2009007594A2 (en) 2007-07-12 2008-06-25 Start assistance method and device for a vehicle stopped on an inclined surface

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FR (1) FR2918714B1 (en)
WO (1) WO2009007594A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114475239B (en) * 2022-04-07 2022-06-17 山东交通学院 Auxiliary driving device for road vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245807A2 (en) * 1996-04-26 2002-10-02 Honda Giken Kogyo Kabushiki Kaisha Engine speed control system for vehicles
WO2004067311A1 (en) * 2003-01-29 2004-08-12 Voith Turbo Gmbh & Co. Kg Method for optimising vehicle handling characteristics
FR2858032A1 (en) * 2003-07-22 2005-01-28 Delphi Tech Inc Motor vehicle starting assistance method, involves increasing effective engine torque up to level of consigned engine torque when drivers behavior is detected and when effective torque is less than consigned torque
WO2005065980A1 (en) * 2003-12-23 2005-07-21 Daimlerchrysler Ag Method and device for influencing a motor torque

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245807A2 (en) * 1996-04-26 2002-10-02 Honda Giken Kogyo Kabushiki Kaisha Engine speed control system for vehicles
WO2004067311A1 (en) * 2003-01-29 2004-08-12 Voith Turbo Gmbh & Co. Kg Method for optimising vehicle handling characteristics
FR2858032A1 (en) * 2003-07-22 2005-01-28 Delphi Tech Inc Motor vehicle starting assistance method, involves increasing effective engine torque up to level of consigned engine torque when drivers behavior is detected and when effective torque is less than consigned torque
WO2005065980A1 (en) * 2003-12-23 2005-07-21 Daimlerchrysler Ag Method and device for influencing a motor torque

Also Published As

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FR2918714B1 (en) 2015-05-01
FR2918714A1 (en) 2009-01-16
WO2009007594A3 (en) 2009-10-15

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