EP3462010B1 - Method of implementation of fuel injector calibration in an internal combustion engine - Google Patents

Method of implementation of fuel injector calibration in an internal combustion engine Download PDF

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Publication number
EP3462010B1
EP3462010B1 EP18190994.6A EP18190994A EP3462010B1 EP 3462010 B1 EP3462010 B1 EP 3462010B1 EP 18190994 A EP18190994 A EP 18190994A EP 3462010 B1 EP3462010 B1 EP 3462010B1
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EP
European Patent Office
Prior art keywords
resetting
frq
frequency
internal combustion
engine
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EP18190994.6A
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German (de)
French (fr)
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EP3462010A1 (en
Inventor
Jose Luis MARTINEZ
Jean Pierre CHEMISKY
Maria Jose MATE RODRIGUEZ
Arnaud TRUTET
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PSA Automobiles SA
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PSA Automobiles SA
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    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2441—Methods of calibrating or learning characterised by the learning 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
    • F02D2250/14—Timing of measurement, e.g. synchronisation of measurements to the engine cycle
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors
    • F02D41/247—Behaviour for small quantities

Definitions

  • the invention relates to a method of performing a resetting of at least one fuel injector in an internal combustion engine, advantageously a motor vehicle engine.
  • a resetting requires cutting off fuel injection to the engine for its execution.
  • the motor vehicle is advantageously a diesel vehicle.
  • fuel injection to the engine may be cut off when the driver lifts his foot on the accelerator pedal or may be automatically initiated by a function provided in the motor vehicle.
  • the automated coasting mode is a function that allows a started motor vehicle to continue to travel while decoupling a transmission to the driving wheels of the vehicle from the internal combustion engine of the vehicle.
  • the transmission conventionally comprises a gearbox and its clutch. The engine no longer running can then be idled or stopped. This function is activated when the vehicle speed is sufficient, for example for an extra-urban profile and in particular a downhill road profile.
  • the document WO-A-2005/84995 describes a method and a system allowing the freewheeling of a vehicle, the vehicle being equipped with slowing means, an engine, a wheel driven by the engine via an automated multi-stage gearbox, an accelerator for engine torque control and a control unit.
  • the control unit is arranged, upon activation of the coasting function and in the presence of an input signal indicating that a predetermined vehicle speed limit is exceeded, for automatic deactivation of the vehicle. coasting function and slow down the vehicle with the deceleration means.
  • the control unit is also arranged for reactivation of the coasting function in the presence of an input signal indicating that the speed of the vehicle has decreased to be close to the predetermined speed limit of the vehicle.
  • the invention can also be applied to a motor vehicle having a system for automatically stopping and restarting the internal combustion engine, this advantageously on a motor vehicle equipped with an automatic freewheeling mode.
  • WO-A-2014/173742 describes a method intended to adapt an injection quantity in injection systems of internal combustion engines of motor vehicles with hybrid motorization or of motor vehicles equipped with an alternator-starter or an integrated alternator-starter.
  • At least one test injection of a very small quantity is carried out in a cylinder of the internal combustion engine.
  • the adequate injected quantity is determined according to the resulting torque.
  • Corresponding correction quantities are then determined in order to adapt the injection quantity.
  • the method has the advantage of not requiring test injections during thrust phases of the internal combustion engine.
  • the problem at the basis of the present invention relates to the execution of resetting of fuel injector (s) in an engine, this execution requiring injection cuts, so that the resetting of the injector (s) ) benefits from sufficient execution occurrences without impacting the handling of the vehicle.
  • the technical effect of the present invention is to best determine the need for resetting the injectors and to control the engine so that it can be reconfigured in order to cover the need.
  • the present invention makes it possible to carry out the adjustment of the injector (s) in order to guarantee the proper functioning of the combustion while at the best estimating its necessity or need in order to have a minimum impact on the driving of the motor vehicle.
  • the request to perform a resetting will only be made when the need for resetting is actually existing in order to have a minimum impact on the driving of the motor vehicle while guaranteeing the full potential of the functions of the injector or of the fuel injectors. On the other hand, it is above all necessary to ensure that the number of readjustments remains sufficiently high to guarantee correct operation of the injector or injectors.
  • the average resetting frequency performed over all the windows traversed is calculated by a sliding average.
  • the calculation of the average resetting frequency performed on all the windows scanned is calculated only once per window, preferably at the end of the last window scanned.
  • the only readjustments taken into account for the calculation of the frequencies are readjustments considered as completely executed.
  • a fully executed resetting is a resetting for which the resetting duration has been greater than a threshold duration.
  • the target frequency is given by a mapping function of the total distance traveled by the motor vehicle.
  • a reconfiguration of the operating parameters of the internal combustion engine is requested as soon as a need to perform a resetting has been identified.
  • the invention also relates to a powertrain comprising an internal combustion engine and an engine control unit ensuring execution and monitoring of control functions.
  • engine control including a resetting of at least one fuel injector to the engine, characterized in that the engine control unit comprises the means of acquisition, processing by software instructions stored in a memory as well as the means of command required to implement a method according to any one of the variants described above.
  • the need for resetting the injectors is thus analyzed and the engine is reconfigured when the need is really existing in order to have a minimum impact on the driving of the vehicle but while guaranteeing the full potential of the injection by its resetting.
  • the injector recalibration function makes it possible to learn the combustion dispersions in order to better control combustion and limit polluting emissions in the exhaust.
  • the invention finally relates to a motor vehicle, characterized in that it comprises such a powertrain, the powertrain being equipped with an automatic system for cutting off fuel injection to the internal combustion engine driven by the control unit. engine.
  • the engine control unit communicates to the powertrain the need to establish itself in a configuration suitable for resetting.
  • the engine control unit continues with its configuration request as long as the need for resetting has not been satisfied.
  • the positive response to a request to configure the engine for the execution of a resetting is only effective when a need for resetting has been clearly identified and the engine control unit considers that it will impact the engine as little as possible. driving the vehicle.
  • the motor vehicle is a hybrid motor vehicle, a vehicle having an automated freewheeling mode and / or a vehicle equipped with a system for automatically stopping and restarting the internal combustion engine.
  • the present invention relates to a method of performing a resetting of at least one injector in an internal combustion engine of a motor vehicle, the resetting requiring a cut-off of fuel injection to the engine for its execution.
  • the fuel injection can be cut off automatically or when the driver lifts his foot from the accelerator pedal.
  • the motor vehicle can be a hybrid motor vehicle, a vehicle having an automated freewheeling mode and / or a vehicle equipped with an automatic stopping and restarting system of the internal combustion engine.
  • the motor vehicle can include these three specificities, two of them or only one of them.
  • a current mileage window to be covered for at least one reset execution.
  • This window is advantageously mileage because the resetting of the injector (s) is frequently done as a function of the mileage traveled by the motor vehicle.
  • the kilometer window is 20 kilometers.
  • This target resetting frequency can be calibrated and is preferably given by a mapping function of the total distance traveled by the motor vehicle, given that it is the distance traveled which is an essential parameter of appreciation if the injectors need 'be failed or not.
  • the target frequency can be adapted according to the vehicle and the history of the occurrences of resetting executions.
  • an average frequency of resetting executions of all the browsed windows is calculated (reference 3), in order to take into account all the resetting executions carried out on all of the browsed windows.
  • this calculation is done once per window, at the end of the last window traversed N.
  • frq required NOT + 1 ⁇ frq target - NOT ⁇ frq NOT ⁇ With frq N , the sliding average over all of the N windows covered, target frq , the target reset frequency.
  • the current frequency of resetting executions, Frq cour is obtained from the distance D already covered in the current window and the number of readjustments, Nbre_Recal, carried out during the course of this distance D.
  • This frequency therefore changes throughout the course of the current window, according to the progress of the distance D and the adjustment (s) made.
  • the goal being that at the end of the run of the current window the current frequency of resetting executions, Frq court , corresponds at least to the required resetting frequency, frq required .
  • a readjustment can be considered to have been completely executed if the reset duration has been greater than a threshold duration.
  • the average time for a registration can be estimated and is substantially reproducible.
  • the threshold reset duration can be the minimum duration determined by experience for which all the readjustments or a large majority of the readjustments have been performed.
  • a need to perform a resetting can be maintained as long as this resetting has not been completely executed, for example not having benefited from a duration greater than the threshold duration.
  • the invention also relates to a power train comprising an internal combustion engine and an engine control unit ensuring execution and monitoring of engine control functions including a resetting of at least one fuel injector to the engine.
  • the engine control unit comprises the means for acquisition, processing by software instructions stored in a memory as well as the control means required for implementing the method described above.
  • means for determining a kilometer window for the execution of at least one resetting of said at least one injector means for determining and storing the frequencies described above (target frequency, average frequency of executions. resetting, ...), means for comparing the current frequency of resetting executions to the required resetting frequency and means for transmitting a need for resetting as a function of the result of this comparison.
  • the engine control can communicate to the power train the need to establish itself in a configuration suitable for performing a resetting of one or more injectors.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Hybrid Electric Vehicles (AREA)

Description

L'invention porte sur un procédé d'exécution d'un recalage d'au moins un injecteur de carburant dans un moteur à combustion interne, avantageusement un moteur de véhicule automobile. Un tel recalage requiert une coupure d'une injection de carburant au moteur pour son exécution. Le véhicule automobile est avantageusement un véhicule Diesel.The invention relates to a method of performing a resetting of at least one fuel injector in an internal combustion engine, advantageously a motor vehicle engine. Such a resetting requires cutting off fuel injection to the engine for its execution. The motor vehicle is advantageously a diesel vehicle.

Pour un véhicule automobile, une coupure d'injection de carburant au moteur peut avoir lieu lors d'un lever de pied du conducteur sur la pédale d'accélérateur ou peut être automatiquement initiée par une fonctionnalité prévue dans le véhicule automobile.For a motor vehicle, fuel injection to the engine may be cut off when the driver lifts his foot on the accelerator pedal or may be automatically initiated by a function provided in the motor vehicle.

Comme fonctionnalités, il pourra être cité l'arrêt du moteur à combustion interne pour une propulsion du véhicule automobile par un moteur autre qu'un moteur à combustion interne, par exemple un moteur électrique comme c'est le cas dans un véhicule automobile hybride. Une autre fonctionnalité concerne un mode automatique de roulage en roue libre équipant le véhicule automobile. Ceci n'est pas limitatif.As functionalities, it will be possible to cite the shutdown of the internal combustion engine for propulsion of the motor vehicle by an engine other than an internal combustion engine, for example an electric motor as is the case in a hybrid motor vehicle. Another functionality relates to an automatic freewheeling mode fitted to the motor vehicle. This is not limiting.

Le mode de roulage en roue libre automatisé est une fonction qui permet à un véhicule automobile lancé de continuer son roulage tout en découplant une transmission aux roues motrices du véhicule du moteur à combustion interne du véhicule. La transmission comprend classiquement une boîte de vitesses et son embrayage. Le moteur n'effectuant plus d'entraînement peut alors être mis au ralenti ou à l'arrêt. Cette fonction est activée lorsque la vitesse du véhicule est suffisante, par exemple pour un profil extra-urbain et notamment un profil de route descendante.The automated coasting mode is a function that allows a started motor vehicle to continue to travel while decoupling a transmission to the driving wheels of the vehicle from the internal combustion engine of the vehicle. The transmission conventionally comprises a gearbox and its clutch. The engine no longer running can then be idled or stopped. This function is activated when the vehicle speed is sufficient, for example for an extra-urban profile and in particular a downhill road profile.

Par exemple, le document WO-A-2005/84995 décrit un procédé et un système permettant le roulage en roue libre d'un véhicule, le véhicule étant équipé de moyens de ralentissement, d'un moteur, d'une roue entraînée par le moteur via une boîte de vitesses à étages automatisé, un accélérateur pour le contrôle du couple moteur et une unité de commande.For example, the document WO-A-2005/84995 describes a method and a system allowing the freewheeling of a vehicle, the vehicle being equipped with slowing means, an engine, a wheel driven by the engine via an automated multi-stage gearbox, an accelerator for engine torque control and a control unit.

L'unité de commande est agencée, lors de l'activation de la fonction de roulage en roue libre et en présence d'un signal d'entrée indiquant qu'une limite de vitesse prédéterminée du véhicule est dépassée, pour la désactivation automatique de la fonction de roulage en roue libre et ralentir le véhicule avec les moyens de ralentissement.The control unit is arranged, upon activation of the coasting function and in the presence of an input signal indicating that a predetermined vehicle speed limit is exceeded, for automatic deactivation of the vehicle. coasting function and slow down the vehicle with the deceleration means.

L'unité de commande est aussi agencée pour la réactivation de la fonction de roulage en roue libre en présence d'un signal d'entrée indiquant que la vitesse du véhicule a diminué pour être proche de la limite de vitesse prédéterminée du véhicule.The control unit is also arranged for reactivation of the coasting function in the presence of an input signal indicating that the speed of the vehicle has decreased to be close to the predetermined speed limit of the vehicle.

L'invention peut aussi être appliquée à un véhicule automobile présentant un système d'arrêt et de redémarrage automatique du moteur à combustion interne, ceci avantageusement sur un véhicule automobile équipé d'un mode de roulage en roue libre automatique.The invention can also be applied to a motor vehicle having a system for automatically stopping and restarting the internal combustion engine, this advantageously on a motor vehicle equipped with an automatic freewheeling mode.

L'ajout de nouvelles situations de vie telles que le mode de roulage en roue libre automatique ou celles occasionnées par des véhicules hybrides font que les occurrences de coupures d'injection de carburant, par exemple lors de levers de pied, sont nettement diminuées. En conséquence les fonctions de contrôle requérant de telles coupures d'injection pour leur exécution n'arriveront pas à avoir leur plein potentiel de performance. Ceci est particulièrement applicable à un recalage d'injecteur de carburant.The addition of new life situations such as the automatic freewheeling mode or those caused by hybrid vehicles means that the occurrences of fuel injection cuts, for example during foot lifting, are markedly reduced. Consequently, the control functions requiring such injection cut-offs for their execution will not reach their full performance potential. This is particularly applicable to a fuel injector reset.

Ce problème n'a cependant pas été reconnu par l'état de la technique et aucun document n'est relatif à l'optimisation de l'exécution d'un recalage se déroulant spécifiquement lors de coupures d'injection de carburant au moteur, coupures d'injection qui peuvent être de moins en moins nombreuses dans les modes de roulage existants et à venir.However, this problem has not been recognized by the state of the art and no document relates to the optimization of the execution of a resetting taking place specifically during cuts in fuel injection to the engine, cuts. injection which may be less and less numerous in the existing and future driving modes.

Le document WO-A-2014/173742 décrit un procédé destiné à adapter une quantité d'injection dans des systèmes d'injection de moteurs à combustion interne de véhicules automobiles à motorisation hybride ou de véhicules automobiles équipés d'un alternateur-démarreur ou d'un alternateur-démarreur intégré.The document WO-A-2014/173742 describes a method intended to adapt an injection quantity in injection systems of internal combustion engines of motor vehicles with hybrid motorization or of motor vehicles equipped with an alternator-starter or an integrated alternator-starter.

Dans une phase de fonctionnement, dans laquelle le moteur électrique du véhicule automobile assiste le moteur à combustion interne, au moins une injection d'essai d'une très petite quantité est réalisée dans un cylindre du moteur à combustion interne. La quantité injectée adéquate est déterminée en fonction du couple résultant. Des grandeurs de correction correspondantes sont alors déterminées pour adapter la quantité d'injection. Le procédé a pour avantage de ne pas nécessiter d'injections d'essai pendant des phases de poussée du moteur à combustion interne.In an operating phase, in which the electric motor of the motor vehicle assists the internal combustion engine, at least one test injection of a very small quantity is carried out in a cylinder of the internal combustion engine. The adequate injected quantity is determined according to the resulting torque. Corresponding correction quantities are then determined in order to adapt the injection quantity. The method has the advantage of not requiring test injections during thrust phases of the internal combustion engine.

Ce document ne décrit ni ne suggère comment quantifier un besoin d'exécution d'un recalage pour un ou des injecteurs de carburant d'un moteur à combustion interne et comment déterminer par une unité de contrôle moteur une existence de ce besoin afin que l'unité de contrôle moteur favorise l'exécution de la fonction de recalage des injecteurs, recalage qui s'active lors des phases de pied levé et en coupure d'injection.This document neither describes nor suggests how to quantify a need to perform a resetting for one or more fuel injectors of an internal combustion engine and how to determine by an engine control unit the existence of this need so that the engine control unit promotes the execution of the function of resetting the injectors, resetting which is activated during the phases of freehold and during injection cut-off.

On connait encore le document EP2042718A2 un procédé d'exécution d'un recalage d'un injecteur dans un moteur à combustion interne d'un véhicule automobile, le recalage requérant une coupure d'une injection de carburant au moteur pour son exécution.We still know the document EP2042718A2 a method of performing a resetting of an injector in an internal combustion engine of a motor vehicle, the resetting requiring a cut of fuel injection to the engine for its execution.

Par conséquent, le problème à la base de la présente invention a trait à l'exécution de recalage d'injecteur(s) de carburant dans un moteur, cette exécution requérant des coupures d'injection, afin que le recalage d'injecteur(s) bénéficie de suffisamment d'occurrences d'exécution sans pourtant impacter la conduite du véhicule.Consequently, the problem at the basis of the present invention relates to the execution of resetting of fuel injector (s) in an engine, this execution requiring injection cuts, so that the resetting of the injector (s) ) benefits from sufficient execution occurrences without impacting the handling of the vehicle.

Pour atteindre cet objectif, il est prévu selon l'invention un procédé d'exécution d'un recalage d'au moins un injecteur dans un moteur à combustion interne d'un véhicule automobile, le recalage requérant une coupure d'une injection de carburant au moteur pour son exécution, caractérisé en ce que :

  • on détermine une fenêtre kilométrique courante à parcourir,
  • on détermine une fréquence cible de recalage,
  • on détermine une fréquence moyenne de recalage exécutés sur l'ensemble des fenêtres parcourues,
  • à partir de la fréquence cible et de la fréquence moyenne de recalage exécutés sur l'ensemble des fenêtres parcourues, on détermine une fréquence de recalage requise pour la fenêtre courante à parcourir, pour respecter la fréquence cible,
  • on détermine tout au long du parcours de la fenêtre courante la fréquence courante de recalage, à partir de la distance parcourue dans la fenêtre courante et du nombre de recalage effectués pendant le parcours de cette distance,
  • on compare cette fréquence courante de recalage à la fréquence de recalage requise,
  • on détermine un besoin d'exécution d'un recalage lorsque la fréquence courante de recalage est inférieure à la fréquence recalage requise.
To achieve this objective, there is provided according to the invention a method of performing a resetting of at least one injector in an internal combustion engine of a motor vehicle, the resetting requiring a cut-off of a fuel injection. to the engine for its execution, characterized in that:
  • a current kilometer window to be traveled is determined,
  • a target resetting frequency is determined,
  • an average resetting frequency executed over all the windows scanned is determined,
  • on the basis of the target frequency and of the average resetting frequency performed over all the windows scanned, a resetting frequency required for the current window to be scanned is determined, in order to comply with the target frequency,
  • the current resetting frequency is determined throughout the course of the current window, from the distance covered in the current window and from the number of readjustments performed during the course of this distance,
  • this current resetting frequency is compared with the required resetting frequency,
  • a need to perform a resetting is determined when the current resetting frequency is less than the required resetting frequency.

L'effet technique de la présente invention est de déterminer au mieux le besoin du recalage des injecteurs et de piloter le moteur afin que celui-ci se reconfigure en vue de couvrir le besoin. La présente invention permet l'exécution du recalage d'injecteur(s) afin de garantir le bon fonctionnement de la combustion tout en estimant au mieux sa nécessité ou besoin afin d'impacter au minimum la conduite du véhicule automobile.The technical effect of the present invention is to best determine the need for resetting the injectors and to control the engine so that it can be reconfigured in order to cover the need. The present invention makes it possible to carry out the adjustment of the injector (s) in order to guarantee the proper functioning of the combustion while at the best estimating its necessity or need in order to have a minimum impact on the driving of the motor vehicle.

Comme l'occurrence des coupures d'injection de carburant à un moteur à combustion interne, qu'elles soient automatiques ou obtenues par des levers de pied de l'accélérateur, décroît avec de nouvelles fonctionnalités équipant un véhicule automobile, notamment la présence d'un moteur électrique en plus du moteur à combustion interne dans un véhicule automobile hybride ou un mode roue libre automatique, il a été nécessaire de surveiller les recalages d'injecteur(s) de carburant dans le moteur pour les prévoir en nombre suffisant afin que le fonctionnement de l'injecteur ou des injecteurs soit optimal.Like the occurrence of fuel injection cut-offs to an internal combustion engine, whether automatic or obtained by lifting the foot from the accelerator, decreases with new functions fitted to a motor vehicle, in particular the presence of an electric motor in addition to the internal combustion engine in a hybrid motor vehicle or an automatic freewheel mode, it was necessary to monitor the injector adjustments (s ) of fuel in the engine to provide them in sufficient number so that the operation of the injector or injectors is optimal.

La demande d'exécution d'un recalage ne sera effectuée que quand le besoin en recalage est réellement existant afin d'impacter au minimum la conduite du véhicule automobile tout en garantissant le plein potentiel des fonctions de l'injecteur ou des injecteurs de carburant. En contrepartie, il convient surtout d'assurer que le nombre de recalages reste suffisamment élevé pour garantir un bon fonctionnement de l'injecteur ou des injecteurs.The request to perform a resetting will only be made when the need for resetting is actually existing in order to have a minimum impact on the driving of the motor vehicle while guaranteeing the full potential of the functions of the injector or of the fuel injectors. On the other hand, it is above all necessary to ensure that the number of readjustments remains sufficiently high to guarantee correct operation of the injector or injectors.

Il peut ainsi être déterminé que les exécutions de recalage sont en retard sur les exécutions de recalage cibles et donc que leur nombre doit être augmenté pour que la fréquence totale d'exécutions se rapproche de la fréquence cible.It can thus be determined that the resetting executions are behind the target resetting executions and therefore that their number must be increased so that the total frequency of executions approaches the target frequency.

Diverses caractéristiques supplémentaires peuvent être prévues, seules ou en combinaisons :
Dans une réalisation, la fréquence moyenne de recalage exécutés sur l'ensemble des fenêtres parcourues est calculée par une moyenne glissante.Various additional features can be provided, alone or in combination:
In one embodiment, the average resetting frequency performed over all the windows traversed is calculated by a sliding average.

Dans une réalisation, le calcul de la fréquence moyenne de recalage exécutés sur l'ensemble des fenêtres parcourues, est calculée une seule fois par fenêtre, de préférence à la fin de la dernière fenêtre parcourue.In one embodiment, the calculation of the average resetting frequency performed on all the windows scanned is calculated only once per window, preferably at the end of the last window scanned.

Dans une réalisation, les seuls recalages pris en compte pour le calcul des fréquences sont des recalages considérés comme complètement exécutés.In one embodiment, the only readjustments taken into account for the calculation of the frequencies are readjustments considered as completely executed.

Dans une réalisation, un recalage complètement exécuté est un recalage dont la durée de recalage a été supérieure à une durée seuil.In one embodiment, a fully executed resetting is a resetting for which the resetting duration has been greater than a threshold duration.

Dans une réalisation, la fréquence cible est donnée par une cartographie fonction de la distance totale parcourue par le véhicule automobile.In one embodiment, the target frequency is given by a mapping function of the total distance traveled by the motor vehicle.

Dans une réalisation, il est demandé une reconfiguration des paramètres de fonctionnement du moteur à combustion interne dès qu'un besoin d'exécution d'un recalage a été identifié.In one embodiment, a reconfiguration of the operating parameters of the internal combustion engine is requested as soon as a need to perform a resetting has been identified.

L'invention concerne aussi un groupe motopropulseur comprenant un moteur à combustion interne et une unité de contrôle moteur assurant une exécution et un suivi de fonctions de contrôle du moteur dont un recalage d'au moins un injecteur de carburant au moteur, caractérisé en ce que l'unité de contrôle moteur comprend les comprend les moyens d'acquisition, de traitement par instructions logicielles stockées dans une mémoire ainsi que les moyens de commande requis à mise en oeuvre d'un procédé selon l'une quelconque des variantes précédemment décrites.The invention also relates to a powertrain comprising an internal combustion engine and an engine control unit ensuring execution and monitoring of control functions. engine control including a resetting of at least one fuel injector to the engine, characterized in that the engine control unit comprises the means of acquisition, processing by software instructions stored in a memory as well as the means of command required to implement a method according to any one of the variants described above.

Il est ainsi analysé le besoin de recalage des injecteurs et le moteur est reconfiguré quand le besoin est réellement existant afin d'impacter au minimum la conduite du véhicule mais en garantissant le plein potentiel de l'injection par son recalage. La fonction recalage d'injecteurs permet d'apprendre les dispersions de combustion afin de maîtriser au mieux la combustion et limiter les émissions polluantes dans l'échappement.The need for resetting the injectors is thus analyzed and the engine is reconfigured when the need is really existing in order to have a minimum impact on the driving of the vehicle but while guaranteeing the full potential of the injection by its resetting. The injector recalibration function makes it possible to learn the combustion dispersions in order to better control combustion and limit polluting emissions in the exhaust.

L'invention concerne enfin un véhicule automobile, caractérisé en ce qu'il comprend un tel groupe motopropulseur, le groupe motopropulseur étant équipé d'un système automatique de coupure d'injection de carburant au moteur à combustion interne piloté par l'unité de contrôle moteur.The invention finally relates to a motor vehicle, characterized in that it comprises such a powertrain, the powertrain being equipped with an automatic system for cutting off fuel injection to the internal combustion engine driven by the control unit. engine.

Quand un besoin d'exécution d'un recalage d'un injecteur ou des injecteurs est détecté, l'unité de contrôle moteur communique au groupe motopropulseur le besoin de s'établir dans une configuration adaptée au recalage. L'unité de contrôle moteur continue avec sa demande de configuration tant que le besoin en exécution de recalage n'a pas été satisfait. La réponse positive à une demande de configuration du moteur pour l'exécution d'un recalage n'est effective que quand un besoin de recalage a été clairement identifié et que l'unité de contrôle moteur estime qu'il va impacter le moins possible la conduite du véhicule.When a need to perform a resetting of an injector or injectors is detected, the engine control unit communicates to the powertrain the need to establish itself in a configuration suitable for resetting. The engine control unit continues with its configuration request as long as the need for resetting has not been satisfied. The positive response to a request to configure the engine for the execution of a resetting is only effective when a need for resetting has been clearly identified and the engine control unit considers that it will impact the engine as little as possible. driving the vehicle.

Avantageusement, le véhicule automobile est un véhicule automobile hybride, un véhicule possédant un mode en roulage roue libre automatisé et/ou un véhicule équipé d'un système d'arrêt et de redémarrage automatiques du moteur à combustion interne.Advantageously, the motor vehicle is a hybrid motor vehicle, a vehicle having an automated freewheeling mode and / or a vehicle equipped with a system for automatically stopping and restarting the internal combustion engine.

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre et au regard du dessin annexé donné à titre d'exemple non limitatif et sur lequel :

  • la figure 1 est une représentation schématique d'un logigramme détaillant les étapes du procédé d'exécution de recalage d'un moteur à combustion interne requérant une coupure d'une injection de carburant au moteur pour son exécution, ce procédé étant conforme à la présente invention.
Other characteristics, aims and advantages of the present invention will become apparent on reading the detailed description which follows and with regard to the appended drawing given by way of non-limiting example and in which:
  • the figure 1 is a schematic representation of a flowchart detailing the steps of the method of performing resetting of an internal combustion engine requiring a cut-off of fuel injection to the engine for its execution, this method being in accordance with the present invention.

En se référant à la figure 1, la présente invention concerne un procédé d'exécution d'un recalage d'au moins un injecteur dans un moteur à combustion interne d'un véhicule automobile, le recalage requérant une coupure d'une injection de carburant au moteur pour son exécution. La coupure d'une injection de carburant peut se faire automatiquement ou lors d'un lever de pied du conducteur de la pédale d'accélérateur.With reference to the figure 1 , the present invention relates to a method of performing a resetting of at least one injector in an internal combustion engine of a motor vehicle, the resetting requiring a cut-off of fuel injection to the engine for its execution. The fuel injection can be cut off automatically or when the driver lifts his foot from the accelerator pedal.

Le recalage d'injecteur(s) de carburant pour un moteur à combustion interne pose un problème du fait d'une diminution des occurrences de coupures d'injection sur les véhicules automobiles dotés de systèmes spécifiques réduisant drastiquement ces occurrences.The resetting of fuel injector (s) for an internal combustion engine poses a problem due to a reduction in the occurrences of injection cut-offs on motor vehicles equipped with specific systems drastically reducing these occurrences.

C'est le cas par exemple quand le véhicule automobile est équipé d'un système automatique de coupure d'injection de carburant au moteur à combustion interne. Le véhicule automobile peut être un véhicule automobile hybride, un véhicule possédant un mode en roulage roue libre automatisé et/ou un véhicule équipé d'un système d'arrêt et de redémarrage automatiques du moteur à combustion interne. Le véhicule automobile peut comprendre ces trois spécificités, deux d'entre elles ou une seule d'entre elles.This is the case, for example, when the motor vehicle is equipped with an automatic system for cutting off fuel injection to the internal combustion engine. The motor vehicle can be a hybrid motor vehicle, a vehicle having an automated freewheeling mode and / or a vehicle equipped with an automatic stopping and restarting system of the internal combustion engine. The motor vehicle can include these three specificities, two of them or only one of them.

Selon la présente invention, il est déterminé à la référence 1 de la figure 1 une fenêtre kilométrique courante à parcourir pour au moins une exécution de recalage. Cette fenêtre est avantageusement kilométrique car le recalage d'injecteur(s) se fait fréquemment en fonction du kilométrage parcouru par le véhicule automobile. Par exemple, la fenêtre kilométrique est de 20 kilomètres.According to the present invention, it is determined at reference 1 of the figure 1 a current mileage window to be covered for at least one reset execution. This window is advantageously mileage because the resetting of the injector (s) is frequently done as a function of the mileage traveled by the motor vehicle. For example, the kilometer window is 20 kilometers.

Il est déterminé (référence 2) une fréquence cible, frqcible, pour le recalage. Cette fréquence cible de recalage peut être calibrable et est de préférence donnée par une cartographie fonction de la distance totale parcourue par le véhicule automobile, étant donné que c'est la distance parcourue qui est un paramètre primordial d'appréciation si les injecteurs ont besoin d'être recalés ou non. La fréquence cible peut être adaptée selon le véhicule et l'historique des occurrences d'exécutions de recalage.It is determined (reference 2) a target frequency, frq target for registration. This target resetting frequency can be calibrated and is preferably given by a mapping function of the total distance traveled by the motor vehicle, given that it is the distance traveled which is an essential parameter of appreciation if the injectors need 'be failed or not. The target frequency can be adapted according to the vehicle and the history of the occurrences of resetting executions.

Ensuite, il est calculé (référence 3) une fréquence moyenne d'exécutions de recalage l'ensemble des fenêtres parcourues, afin de prendre en compte toutes les exécutions de recalage effectuées sur l'ensembles des fenêtres parcourues.Then, an average frequency of resetting executions of all the browsed windows is calculated (reference 3), in order to take into account all the resetting executions carried out on all of the browsed windows.

Pour le calcul de la fréquence moyenne d'exécutions, frqN , on peut utiliser une moyenne glissante définie par la relation: frq N ‾ = 1 N ⋅ frq N + N − 1 N ⋅ frq N − 1 ‾

Figure imgb0001

  • Avec, N la fenêtre parcourue,
  • frqN , la fréquence dans la fenêtre N,
  • frqN , la moyenne glissante sur l'ensemble des N fenêtres parcourues, et
  • frq N- 1, la moyenne glissante sur l'ensemble des N-1 fenêtres précédentes parcourues.
For the calculation of the average frequency of executions, frq N , we can use a sliding average defined by the relation: frq NOT ‾ = 1 NOT ⋅ frq NOT + NOT - 1 NOT ⋅ frq NOT - 1 ‾
Figure imgb0001
  • With, N the browsed window,
  • frq N , the frequency in the window N,
  • frq N , the sliding average over the set of N browsed windows, and
  • frq NOT- 1 , the sliding average over all the previous N-1 windows covered.

Avantageusement, ce calcul est fait une fois par fenêtre, à la fin de la dernière fenêtre parcourue N.Advantageously, this calculation is done once per window, at the end of the last window traversed N.

On souhaite ainsi qu'à la fin de la fenêtre courante à parcourir la fréquence courante de recalage, Frqcour, soit égale ou supérieure à la fréquence requise, frqrequise : Frq cour ≥ frq requise

Figure imgb0002
We thus wish that at the end of the current window to be traversed the current resetting frequency, Frq cour , is equal to or greater than the required frequency, frq required : Frq court ≥ frq required
Figure imgb0002

A cet effet, à partir de la fréquence cible, frqcible, et de la fréquence moyenne d'exécutions de recalage, frqN , sur l'ensemble des fenêtres parcourues, on détermine (référence 4 sur la figure 1) quelle doit être la fréquence requise, frqrequise pour l'ensemble de la fenêtre courante à parcourir pour respecter la fréquence cible.For this purpose, from the target frequency, frq target, and the average frequency of recalibration executions frq N , on all the browsed windows, one determines (reference 4 on the figure 1 ) what must be the required frequency, frq required for the whole of the current window to be covered in order to respect the target frequency.

A partir de la relation (1), cette fréquence de recalage requise, frqrequise pour la fenêtre courante à parcourir s'écrit : frq requise = N + 1 ⋅ frq cible − N ⋅ frq N ‾

Figure imgb0003
Avec frqN , la moyenne glissante sur l'ensemble des N fenêtres parcourues, frqcible , la fréquence cible de recalage.From relation (1), this required resetting frequency, frq required for the current window to be traversed is written: frq required = NOT + 1 ⋅ frq target - NOT ⋅ frq NOT ‾
Figure imgb0003
 With frq N , the sliding average over all of the N windows covered, target frq , the target reset frequency.

Ensuite, lorsque le véhicule parcourt effectivement la fenêtre courante, on détermine (référence 5) tout au long du parcours de cette fenêtre courante, la fréquence courante d'exécutions de recalage, Frqcour. Dans le cas d'une fenêtre kilométrique, cette fréquence courante d'exécutions de recalage, Frqcour, est obtenue ainsi, à un instant donné t de parcours de la fenêtre courante : Frq cour = Nbre _ Recal D

Figure imgb0004
Avec Nbre_Recal, le nombre de recalage dans la fenêtre courante à l'instant t et D la distance parcourue dans la fenêtre courant à l'instant t. Autrement dit, lorsqu'elle est calculée, la fréquence courante d'exécutions de recalage, Frqcour, est obtenue à partir de la distance D déjà parcourue dans la fenêtre courante et du nombre de recalage, Nbre_Recal, effectués pendant le parcours de cette distance D. Cette fréquence évolue donc tout au long du déroulement de la fenêtre courante, en fonction de l'avancée de la distance D et du ou des recalages effectués. Le but étant qu'à la fin du parcours de la fenêtre courante la fréquence courante d'exécutions de recalage, Frqcour, corresponde au minimum à la fréquence de recalage requise, frqrequise. Then, when the vehicle actually traverses the current window, the current frequency of resetting executions, Frq cour , is determined (reference 5) throughout the course of this current window . In the case of a kilometer window, this current frequency of resetting executions, Frq cour , is obtained as follows, at a given time t during the run of the current window: Frq court = No. _ Recal D
Figure imgb0004
 With Nbre_Recal, the number of resets in the current window at time t and D the distance traveled in the current window at time t. In other words, when it is calculated, the current frequency of resetting executions, Frq cour , is obtained from the distance D already covered in the current window and the number of readjustments, Nbre_Recal, carried out during the course of this distance D. This frequency therefore changes throughout the course of the current window, according to the progress of the distance D and the adjustment (s) made. The goal being that at the end of the run of the current window the current frequency of resetting executions, Frq court , corresponds at least to the required resetting frequency, frq required .

On compare donc pendant le parcours de la fenêtre courante (référence 6) la fréquence courante d'exécutions de recalage, Frqcour, à la fréquence de recalage requise, frqrequise. One therefore compares during the course of the current window (reference 6) the current frequency of resetting executions, Frq court , with the required resetting frequency, frq required .

Il est ainsi déterminé à la référence 7 un besoin d'exécution ou non d'un recalage. Ce besoin d'exécution est identifié quand la fréquence courante d'exécution de recalage, Frqcour, est inférieure à la fréquence de recalage requise, frqrequise. It is thus determined at reference 7 a need to perform or not a reset. This execution need is identified when the current resetting execution frequency, Frq cour , is less than the required resetting frequency, frq required .

Ainsi, il peut être connu la périodicité des exécutions de recalage. Il peut être ainsi établi un historique d'occurrences pour le recalage.Thus, it can be known the periodicity of the resetting executions. It is thus possible to establish a history of occurrences for the registration.

Il est ainsi déterminé un besoin d'exécution ou non d'un recalage avec une mise à jour des situations de vie du véhicule concernant les exécutions de recalage.It is thus determined a need to carry out or not a resetting with an update of the life situations of the vehicle concerning the resetting executions.

L'ajout de nouvelles situations de vie telles que le mode de roulage en roue libre automatique, aussi dénommé « Coasting » en langue anglo-saxonne ou fréquentes pour des véhicules hybrides, font que les occurrences de pied levé et de coupures d'injection de carburant sont nettement diminuées. En conséquence, les possibilités d'exécutions de recalage sont fortement diminuées.The addition of new life situations such as the automatic freewheeling mode, also known as “Coasting” in the Anglo-Saxon language or frequent for hybrid vehicles, means that the occurrences of unhurt and injection cuts of fuel are significantly reduced. As a result, the possibilities of performing readjustments are greatly reduced.

Afin d'affiner le procédé, on peut prévoir que les seuls recalages pris en compte pour le calcul des fréquences sont des recalages considérés comme complètement exécutés. Un recalage peut être considéré comme complètement exécuté si la durée de recalage a été supérieure à une durée seuil. Le temps moyen d'un recalage peut être estimé et est sensiblement reproductible. La durée de recalage seuil peut être la durée minimale déterminée par expérience pour laquelle tous les recalages ou une forte majorité des recalages ont été exécutés.In order to refine the method, provision can be made for the only readjustments taken into account for the calculation of the frequencies are readjustments considered to have been completely executed. A readjustment can be considered to have been completely executed if the reset duration has been greater than a threshold duration. The average time for a registration can be estimated and is substantially reproducible. The threshold reset duration can be the minimum duration determined by experience for which all the readjustments or a large majority of the readjustments have been performed.

Un besoin d'exécution d'un recalage peut être maintenu tant que ce recalage n'a pas été complètement exécuté en n'ayant par exemple pas bénéficié d'une durée supérieure à la durée seuil.A need to perform a resetting can be maintained as long as this resetting has not been completely executed, for example not having benefited from a duration greater than the threshold duration.

Il peut être procédé à une reconfiguration des paramètres de fonctionnement du moteur à combustion interne dès qu'un besoin d'exécution d'un recalage a été identifié.It is possible to reconfigure the operating parameters of the internal combustion engine as soon as a need to perform a resetting has been identified.

Il peut être effectué une réactualisation des fenêtres temporelles et kilométriques à intervalles réguliers prédéterminés, ceci pendant toute la vie du véhicule. La réactualisation peut se faire lors de roulages successifs pendant toute une vie du véhicule.It is possible to update the time and mileage windows at regular predetermined intervals, this throughout the life of the vehicle. The updating can be done during successive runs throughout the life of the vehicle.

L'invention concerne aussi un groupe motopropulseur comprenant un moteur à combustion interne et une unité de contrôle moteur assurant une exécution et un suivi de fonctions de contrôle du moteur dont un recalage d'au moins un injecteur de carburant au moteur.The invention also relates to a power train comprising an internal combustion engine and an engine control unit ensuring execution and monitoring of engine control functions including a resetting of at least one fuel injector to the engine.

Selon l'invention, l'unité de contrôle moteur comprend les moyens d'acquisition, de traitement par instructions logicielles stockées dans une mémoire ainsi que les moyens de commande requis à mise en oeuvre du procédé précédemment décrit.According to the invention, the engine control unit comprises the means for acquisition, processing by software instructions stored in a memory as well as the control means required for implementing the method described above.

On y trouvera par exemple des moyens de détermination d'une fenêtre kilométrique pour l'exécution d'au moins un recalage dudit au moins un injecteur, des moyens de détermination et de mémorisation des fréquences précédemment décrites (fréquence cible, fréquence moyenne d'exécutions de recalage,...), des moyens de comparaison de la fréquence courante d'exécutions de recalage à la fréquence de recalage requise et des moyens d'émission d'un besoin de recalage en fonction du résultat de cette comparaison.For example, there will be found means for determining a kilometer window for the execution of at least one resetting of said at least one injector, means for determining and storing the frequencies described above (target frequency, average frequency of executions. resetting, ...), means for comparing the current frequency of resetting executions to the required resetting frequency and means for transmitting a need for resetting as a function of the result of this comparison.

S'il y a besoin d'exécution d'un recalage, le contrôle moteur peut communiquer au groupe motopropulseur le besoin de s'établir dans une configuration adaptée à l'exécution d'un recalage d'un ou de plusieurs injecteurs.If there is a need to perform a resetting, the engine control can communicate to the power train the need to establish itself in a configuration suitable for performing a resetting of one or more injectors.

Claims (10)

  1. Method of performing a resetting of at least one injector in an internal combustion engine of a motor vehicle, the resetting requiring a cut of fuel injection to the engine for its execution, characterized in that:
    - we determine (1) a current mileage window to go,
    - we determine (2) a target resetting frequency (frqcible ),
    - we determine (3) an average resetting frequency executed on all the windows scanned (frqN ).
    - from the target frequency (frqcible ), and from the average resetting frequency performed over all the windows scanned ( frqN ), we determine (4) a resetting frequency required for the current window to browse (frqrequise ) to respect the target frequency (frqcible ),
    - we determine (5) throughout the course of the current window the current resetting frequency (Frqcour ), from the distance covered in the current window and from the number of resetting performed during the course of this distance,
    - we compare (6) this current resetting frequency (Frqcour ) with the required resetting frequency (frqrequise ),
    - a need to perform a resetting is determined (7) when the current resetting frequency (Frqcour ) is less than the required resetting frequency (frqrequise ).
  2. Method according to claim 1, in which the average resetting frequency performed over all the windows traversed ( frqN ) is calculated by a sliding average.
  3. Method according to Claim 1 or Claim 2, in which the calculation of the average resetting frequency carried out over all the windows traversed ( frqN ) is calculated only once per window, preferably at the end of the last window browsed.
  4. Method according to any one of the preceding claims, in which the only readjustments taken into account for the calculation of the frequencies are readjustments considered to be completely executed.
  5. Method according to the preceding claim, in which a fully executed resetting is a resetting of which the resetting duration has been greater than a threshold duration.
  6. Method according to any one of the preceding claims, in which the target frequency is given by a mapping function of the total distance traveled by the motor vehicle.
  7. Method according to any one of the preceding claims, in which a reconfiguration of the operating parameters of the internal combustion engine is requested as soon as a need to perform a reset has been identified.
  8. Powertrain comprising an internal combustion engine and an engine control unit ensuring execution and monitoring of engine control functions including a resetting of at least one fuel injector to the engine, characterized in that the control unit engine control comprises the means of acquisition, processing by software instructions stored in a memory as well as the control means required to implement a method according to any one of the preceding claims.
  9. Motor vehicle, characterized in that it comprises a powertrain according to claim 8, the powertrain being equipped with an automatic fuel injection cut-off system to the internal combustion engine controlled by the engine control unit.
  10. Motor vehicle according to claim 9, which is a hybrid motor vehicle, a vehicle having an automated freewheeling mode and / or a vehicle equipped with an automatic stopping and restarting system of the internal combustion engine.
EP18190994.6A 2017-09-29 2018-08-27 Method of implementation of fuel injector calibration in an internal combustion engine Active EP3462010B1 (en)

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SE0400605L (en) 2004-03-09 2005-01-25 Volvo Lastvagnar Ab Method, system and computer program for automatic freewheeling of vehicles
JP4978187B2 (en) * 2006-12-28 2012-07-18 トヨタ自動車株式会社 Control system and control method for internal combustion engine
US7912623B2 (en) * 2007-09-25 2011-03-22 Denso Corporation Engine control system designed to manage schedule of engine control tasks
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