EP1994270A1 - Method for identifying the thresholds at which pollutant gases are emitted with a view to controlling the operation of a motor vehicle in stop and start mode - Google Patents

Method for identifying the thresholds at which pollutant gases are emitted with a view to controlling the operation of a motor vehicle in stop and start mode

Info

Publication number
EP1994270A1
EP1994270A1 EP06726239A EP06726239A EP1994270A1 EP 1994270 A1 EP1994270 A1 EP 1994270A1 EP 06726239 A EP06726239 A EP 06726239A EP 06726239 A EP06726239 A EP 06726239A EP 1994270 A1 EP1994270 A1 EP 1994270A1
Authority
EP
European Patent Office
Prior art keywords
fuel injected
burned
stop
fuel
injected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06726239A
Other languages
German (de)
French (fr)
Inventor
Jean-Christophe Denis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1994270A1 publication Critical patent/EP1994270A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
    • 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
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0614—Actual fuel mass or fuel injection amount
    • 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
    • F02D41/042—Introducing corrections for particular operating conditions for stopping 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
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/065—Introducing corrections for particular operating conditions for engine starting or warming up for starting at hot start or restart
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to a method for identifying the emission thresholds of polluting gases to control the operation in "Stop and Start” stop an engine just before and during the immobilization of a vehicle automobile, and restart it instantly at the first driver's request.
  • the system “Stop and Start” is a system that stops the engine just before and during the immobilization of the vehicle (traffic lights, traffic jams, etc.). The system starts automatically and instantaneously as soon as the brake pedal is released by the driver, when the driver wants to restart.
  • the emission thresholds may be, for example, the thresholds defined by the EOBD.
  • the European On Board Diagnosis (EOBD) is a European regulation accompanying the EURO 3 standard.
  • the purpose of the EOBD is to inform the driver via the engine diagnostic LED of any fault affecting the clearance by exceeding a threshold.
  • the EOBD is a monitoring software integrated into the engine control computer, it has two main functions: to detect the failures of the emission control equipment of the vehicle, and to signal to the driver the failures that result in exceeding an emission threshold, so that he can have the vehicle repaired.
  • the object of the present invention is to limit the impact of these stops / restarts on the emissions of gaseous pollutants, such as HC, CO and NOx.
  • the quantity of fuel injected is calculated on each restart, b) the difference between the quantity of fuel injected and the amount of normal fuel required is determined, the said resultant amount being considered to represent the quantity of fuel injected but not burned, c) comparing said injected but unburned fuel quantity with a predetermined threshold value, as a function of the distance traveled, d) inhibiting or not the operation in "Stop and Start” mode according to whether said quantity of fuel injected but not burned is greater than or not the predetermined threshold value.
  • the calculation of the amount of fuel injected but not burned is an iterative calculation and by summation, so as to calculate the sum of fuel quantities injected but not burned for a series restarts between two engine restarts using the ignition key.
  • each time the traveled distance counter returns to zero the value of the sum of the fuel injected but unburned amounts is reset to a value obtained by difference between said sum just before reset and a predetermined threshold value, when this difference is positive, and reset to zero when said difference is negative.
  • the method is repeated over at least three driving cycles, and it comprises, in addition, the following step: a) storing each excess of said quantity of fuel
  • FIG. 1 is a graph representative of an emission threshold according to the EOBD as a function of the distance traveled (also referred to as the "EOBD threshold” template) since the activation of the ignition contact by the ignition key. contact.
  • Figure 2 is a graph representative of the evolution of the level of the restart quality indicator parameter, according to the present invention, which level of said parameter controls the setting or not in "Stop and Start” mode of the engine.
  • a restart quality indicator is defined, as explained hereinafter. after.
  • the motor may or may not operate in "Stop and Start" mode.
  • the present invention on each restart, it calculates the amount of gasoline injected and is compared to the nominal amount of fuel required. The difference between these two quantities is considered to be gasoline which has been injected and which has not burned, and which consequently finds itself in the exhaust. This quantity is then compared with the level of unburned hydrocarbons (HC), a "fat polluter” limit as a function of the distance traveled. Depending on the result of this comparison, the "Stop and Start" function is inhibited or not, as will be explained later.
  • HC unburned hydrocarbons
  • Each cycle, between two starts with the ignition key, comprises a series of startups and reboots, which can be named 1, 2, .., i, ...
  • the template "Threshold EOBD” is defined by three parameters, namely InitEOBD, DistEOBD and slopeEOBD calibrated. It has the shape shown in the drawing of Figure 1 according to said distance traveled.
  • the curve has an initial flat section which is intended to allow the "Stop and Start", even after a difficult first start. It is parameterized by "InitE ⁇ BD" on the ordinate axis or axis of the EOBD and "DistEOBD” thresholds on the abscissa axis or axis of the distance traveled. Then, the slope (PenteEOBD) makes it possible to guarantee the respect of the criterion of the EOBD standard.
  • the value of PenteEOBD is that of the line segment joining the origin O to the set point of coordinates InitEOBD and DistEOBD. The origin O corresponds to the start with the ignition key.
  • the counter Sum Ti is reset to the value A, which corresponds to the same value A representing the difference between the Sum value.
  • Ti and the threshold value E oBD at first maximum distance traveled Dl At the second reset illustrated by the arrow F2, the difference B between the value of Sum Ti and the template ThresholdEOBD being negative, the initialization is then zeroed in D2 (second distance traveled max.).

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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)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Method for identifying the thresholds at which pollutant gases are emitted with a view to controlling the operation in "stop and start" mode by stopping an engine just before and while a motor vehicle is stationary, whereby, upon each re-start, the amount of fuel injected is calculated, and the difference between the amount of fuel injected and the normal amount of fuel needed is calculated, the said resulting quantity being considered to represent the amount of fuel that was injected but not burnt; the said amount of fuel injected but not burnt is then compared against a predetermined threshold value, according to the distance covered, and finally, "stop and start" operation is or is not inhibited according to whether the said amount of fuel injected but not burnt is above or below the predetermined threshold value.

Description

PROCEDE POUR IDENTIFIER LES SEUILS D'EMISSION DE GAZ POLLUANTS EN VUE DE COMMANDER LE FONCTIONNEMENT D'UN VEHICULE AUTOMOBILE EN MODE « STOP AND START» METHOD FOR IDENTIFYING GAS EMISSIONS OF POLLUTANT GASES TO CONTROL THE OPERATION OF A MOTOR VEHICLE IN "STOP AND START" MODE
[0001] La présente invention concerne un procédé pour identifier les seuils d'émission de gaz polluants en vue de commander le fonctionnement en mode «Stop and Start» d'arrêt d'un moteur juste avant et pendant l'immobilisation d'un véhicule automobile, et de le redémarrer instantanément à la première sollicitation du conducteur.The present invention relates to a method for identifying the emission thresholds of polluting gases to control the operation in "Stop and Start" stop an engine just before and during the immobilization of a vehicle automobile, and restart it instantly at the first driver's request.
[0002] Le système « Stop and Start» (ST) est un système selon lequel il y a arrêt du moteur juste avant et pendant l'immobilisation du véhicule (feux tricolores, embouteillages, etc.). Le système se remet en marche de façon automatique et instantanée dès que la pédale de frein est lâchée par le conducteur, lorsque ce dernier souhaite repartir.The system "Stop and Start" (ST) is a system that stops the engine just before and during the immobilization of the vehicle (traffic lights, traffic jams, etc.). The system starts automatically and instantaneously as soon as the brake pedal is released by the driver, when the driver wants to restart.
[0003] Les seuils d'émission peuvent être, par exemple, les seuils définis par l'EOBD. L'EOBD (European On Board Diagnosis) est un règlement européen accompagnant la norme EURO 3. L' EOBD vise à signaler au conducteur par l'intermédiaire du voyant de diagnostic moteur tout défaut affectant la dépollution par dépassement d'un seuil. L' EOBD est un logiciel de surveillance intégré au calculateur de contrôle moteur, il a deux fonctions principales : détecter les défaillances de l'équipement antipollution du véhicule, et signaler au conducteur les défaillances qui entraînent un dépassement d'un seuil d'émission, afin qu'il puisse faire réparer le véhicule.The emission thresholds may be, for example, the thresholds defined by the EOBD. The European On Board Diagnosis (EOBD) is a European regulation accompanying the EURO 3 standard. The purpose of the EOBD is to inform the driver via the engine diagnostic LED of any fault affecting the clearance by exceeding a threshold. The EOBD is a monitoring software integrated into the engine control computer, it has two main functions: to detect the failures of the emission control equipment of the vehicle, and to signal to the driver the failures that result in exceeding an emission threshold, so that he can have the vehicle repaired.
[0004] Le risque lié à l'EOBD est l'accumulation de redémarrages difficiles sur le cycle, pouvant entraîner le dépassement des seuils d'émission OBD (« On-Board Diagnosis» ou «Diagnostic embarqué »). Dans le cadre du développement des nouvelles fonctions de système « Stop and Start», le moteur s'arrête et redémarre jusqu'à 12 fois par cycle d'homologation MVEG, c'est-à-dire par cycle d'homologation des véhicules en Europe, selon les normes européennes en vigueur.[0004] The risk related to the EOBD is the accumulation of difficult restarts on the cycle, which may result in exceeding OBD emission thresholds ("On-Board Diagnosis" or "Onboard Diagnosis"). As part of the development of the new "Stop and Start" system functions, the engine stops and restarts up to 12 times per MVEG approval cycle, that is to say, by vehicle approval cycle. Europe, according to the European standards in force.
[0005] Le but de la présente invention est de limiter l'impact de ces arrêts/redémarrages sur les émissions de gaz polluants, tels que HC, CO et NOx.The object of the present invention is to limit the impact of these stops / restarts on the emissions of gaseous pollutants, such as HC, CO and NOx.
[0006] En cas de problème sur la fonction entraînant des émissions anormalement élevées, il convient d'inhiber la fonction « Stop and Start» avant que celle-ci entraîne le dépassement des seuils « gros pollueurs ».In case of problem on the function resulting in abnormally high emissions, it is necessary to inhibit the "Stop and Start" function before it leads to exceeding the thresholds "big polluters".
[0007] Pour atteindre ce but, selon le procédé de l'invention: a) on calcule, sur chaque redémarrage, la quantité de carburant injectée, b) on fait la différence entre la quantité de carburant injectée et la quantité de carburant normale nécessaire, ladite quantité résultante étant considérée représenter la quantité de carburant injectée mais non brûlée, c) on compare ladite quantité de carburant injectée mais non brûlée à une valeur de seuil prédéterminée, en fonction de la distance parcourue, d) on inhibe ou non le fonctionnement en mode « Stop and Start » selon que ladite quantité de carburant injectée mais non brûlée est supérieure ou non à la valeur de seuil prédéterminée.To achieve this goal, according to the method of the invention: a) the quantity of fuel injected is calculated on each restart, b) the difference between the quantity of fuel injected and the amount of normal fuel required is determined, the said resultant amount being considered to represent the quantity of fuel injected but not burned, c) comparing said injected but unburned fuel quantity with a predetermined threshold value, as a function of the distance traveled, d) inhibiting or not the operation in "Stop and Start" mode according to whether said quantity of fuel injected but not burned is greater than or not the predetermined threshold value.
[0008] Selon le mode préféré de réalisation de l'invention, le calcul de la quantité de carburant injectée mais non brûlée est un calcul itératif et par sommation, de manière à calculer la somme des quantités de carburant injectées mais non brûlées pour une série de redémarrages entre deux redémarrages du moteur au moyen de la clé de contact.According to the preferred embodiment of the invention, the calculation of the amount of fuel injected but not burned is an iterative calculation and by summation, so as to calculate the sum of fuel quantities injected but not burned for a series restarts between two engine restarts using the ignition key.
[0009] Selon le mode préféré de réalisation de l'invention, à chaque fois que le compteur de distance parcourue repasse à zéro, la valeur de la somme des quantités de carburant injectées mais non brûlées est réinitialisée à une valeur obtenue par différence entre ladite somme juste avant réinitialisation et une valeur de seuil prédéterminée, lorsque cette différence est positive, et est réinitialisée à la valeur zéro lorsque ladite différence est négative.According to the preferred embodiment of the invention, each time the traveled distance counter returns to zero, the value of the sum of the fuel injected but unburned amounts is reset to a value obtained by difference between said sum just before reset and a predetermined threshold value, when this difference is positive, and reset to zero when said difference is negative.
[0010] De manière préférentielle, le procédé est répété sur au moins trois cycles de conduite, et il comporte, de plus, l'étape suivante : a) on mémorise chaque dépassement de ladite quantité de carburantPreferably, the method is repeated over at least three driving cycles, and it comprises, in addition, the following step: a) storing each excess of said quantity of fuel
[0011] 30 injectée mais non brûlée par rapport à la valeur de seuil prédéterminée, a) on adresse un code défaut si ledit dépassement se confirme sur trois cycles de conduite. [0011] injected but not burned with respect to the predetermined threshold value, a) a fault code is addressed if said exceeding is confirmed over three driving cycles.
[0012] D'autres caractéristiques et avantages de la présente invention vont maintenant être décrits de manière plus détaillée à l'aide des dessins annexés à titre illustratif et non limitatif et dans lesquels :Other features and advantages of the present invention will now be described in more detail with the aid of the accompanying drawings for illustrative and non-limiting and in which:
[0013] La figure 1 est un graphe représentatif d'un seuil d'émission selon l'EOBD en fonction de la distance parcourue (désigné également: gabarit « Seuil EOBD ») depuis l'activation du contact d'allumage par la clé de contact.FIG. 1 is a graph representative of an emission threshold according to the EOBD as a function of the distance traveled (also referred to as the "EOBD threshold" template) since the activation of the ignition contact by the ignition key. contact.
[0014] La figure 2 est un graphe représentatif de l'évolution du niveau du paramètre indicateur de qualité de redémarrage, selon la présente invention, lequel niveau dudit paramètre commande la mise ou non en mode « Stop and Start» du moteur.Figure 2 is a graph representative of the evolution of the level of the restart quality indicator parameter, according to the present invention, which level of said parameter controls the setting or not in "Stop and Start" mode of the engine.
[0015] Pour identifier le phénomène de dysfonctionnement dans l'accumulation de redémarrages difficiles sur le cycle d'homologation, pouvant entraîner le dépassement des seuils d'émission OBD, il est défini un indicateur de qualité de redémarrage, comme cela est exposé ci-après. En fonction du niveau de cet indicateur de redémarrage, comparé à une valeur de référence, le moteur peut fonctionner ou non en mode « Stop and Start ».To identify the phenomenon of malfunction in the accumulation of difficult restarts on the homologation cycle, which may lead to the exceeding of the OBD emission thresholds, a restart quality indicator is defined, as explained hereinafter. after. Depending on the level of this restart indicator, compared to a reference value, the motor may or may not operate in "Stop and Start" mode.
[0016] Selon le principe de la présente invention, sur chaque redémarrage, on calcule la quantité d'essence injectée et on la compare à la quantité d'essence nominale nécessaire. La différence entre ces deux quantités est considérée comme étant de l'essence qui a été injectée et qui n'a pas brûlé, et qui, par conséquent, se retrouve à l'échappement. On compare ensuite cette quantité au niveau des hydrocarbures imbrûlés (HC) limite« gros pollueur» en fonction de la distance parcourue. Selon le résultat de cette comparaison, on inhibe ou non la fonction «Stop and Start », comme il va être expliqué plus loin.According to the principle of the present invention, on each restart, it calculates the amount of gasoline injected and is compared to the nominal amount of fuel required. The difference between these two quantities is considered to be gasoline which has been injected and which has not burned, and which consequently finds itself in the exhaust. This quantity is then compared with the level of unburned hydrocarbons (HC), a "fat polluter" limit as a function of the distance traveled. Depending on the result of this comparison, the "Stop and Start" function is inhibited or not, as will be explained later.
[0017] Chaque cycle, entre deux démarrages avec la clé de contact, comporte une série de démarrage et redémarrages, que l'on peut nommer 1, 2, .., i, ...Each cycle, between two starts with the ignition key, comprises a series of startups and reboots, which can be named 1, 2, .., i, ...
[0018] En premier lieu, on fait la somme des quantités d'essence injectées Tinj lors d'un (re)démarrage (en grammes). On soustrait à cette valeur la quantité nominale Mnom, elle-même fonction de la température d'eau nécessaire au (re)démarrage. On en déduit la quantité d'essence injectée qui n'a pas brûlé (Ti):In the first place, we sum the quantities of gasoline injected T inj during a (re) start (in grams). This value is subtracted from the nominal quantity M name , which is itself a function of the water temperature required for (re) starting. We deduce the quantity of gasoline injected that did not burn (Ti):
[0019] Ti = (L Tinj) - Mnom Ti = (LT inj ) - M noun
[0020] On notera que la valeur de Ti est minorée par O. [0021] On incrémente, à chaque (re)démarrage, un compteur sommant ces valeurs de gaz non brûlés Ti. Ce compteur « Somme Ti » est initialisé à O à chaque contact démarrage à la clé.Note that the value of Ti is decreased by O. At each (re) start, a counter summing these unburned gas values Ti is incremented. This counter "Sum Ti" is initialized to O at each key start contact.
[0022] Somme Ti = L Ti (sur les démarrages)[0022] Sum Ti = L Ti (on starts)
[0023] Ensuite, on relève la valeur de la « Distance parcourue» depuis la mise en marche avec la clé.Then, we note the value of the "Distance traveled" since the start with the key.
[0024] On inhibe la fonction « Stop and Start », si l'inégalité suivante est respectée, à savoir, c'est- à-dire SI :The "Stop and Start" function is inhibited, if the following inequality is respected, namely, that is to say SI:
[0025] Somme Ti > Seuil EOBD[0025] Sum Ti> Threshold EOBD
[0026] Le gabarit « Seuil EOBD » est défini par trois paramètres, à savoir InitEOBD, DistEOBD et PenteEOBD calibrables. Il présente la forme représentée sur le dessin de la figure 1 en fonction de ladite distance parcourue.The template "Threshold EOBD" is defined by three parameters, namely InitEOBD, DistEOBD and slopeEOBD calibrated. It has the shape shown in the drawing of Figure 1 according to said distance traveled.
[0027] Comme on peut le voir sur le dessin de la figure 1, la courbe présente un tronçon plat initial qui est destiné à autoriser le « Stop and Start », même après un premier démarrage difficile. Il est paramétré par « InitEθBD»sur l'axe des ordonnées ou axe des seuils EOBD et « DistEOBD» sur l'axe des abscisses ou axe de la distance parcourue. Ensuite, la pente (PenteEOBD) permet de garantir le respect du critère de la norme EOBD. La valeur de PenteEOBD est celle du segment de droite joignant l'origine O au point paramétré de coordonnées InitEOBD et DistEOBD. L'origine O correspond au démarrage par la clé de contact. a) En se référant ensuite à la figure 2, le compteur « Somme Ti » est réinitialisé lorsque le compteur de distance parcourue repasse à O, c'est-à-dire en Dl, D2, etc. La valeur de Somme Ti est représentée par la courbe en paliers en traits interrompus courts. La réinitialisation se fait, non pas à la valeur O, mais à l'écart entre le compteur « Somme Ti » et le gabarit « SeuilEoBD» à distance parcourue maximale, la valeur dudit gabarit étant représenté en traits pleins sur le dessin de la figure 2. La réinitialisation est toujours positive (on ne tient pas compte de la «réserve de pollution» positive le cas échéant juste avant réinitialisation).As can be seen in the drawing of Figure 1, the curve has an initial flat section which is intended to allow the "Stop and Start", even after a difficult first start. It is parameterized by "InitEθBD" on the ordinate axis or axis of the EOBD and "DistEOBD" thresholds on the abscissa axis or axis of the distance traveled. Then, the slope (PenteEOBD) makes it possible to guarantee the respect of the criterion of the EOBD standard. The value of PenteEOBD is that of the line segment joining the origin O to the set point of coordinates InitEOBD and DistEOBD. The origin O corresponds to the start with the ignition key. a) Referring next to Figure 2, the counter "Sum Ti" is reset when the distance counter traveled returns to O, that is to say, D1, D2, etc. The value of Sum Ti is represented by the curve in steps in short broken lines. The reset is done, not at the value O, but at the distance between the counter "Sum Ti" and the template "Threshold E oBD" maximum distance traveled, the value of said template being represented in solid lines on the drawing of Figure 2. The reset is always positive (the positive "pollutant reserve" is not taken into account just before the reset).
[0028] Ainsi, en se référant toujours à la figure 2, à la première réinitialisation illustrée par la flèche FI, le compteur Somme Ti est réinitialisé à la valeur A, qui correspond à la même valeur A représentant la différence entre la valeur de Somme Ti et la valeur de SeuilEoBD à première distance parcourue maximale Dl. A la seconde réinitialisation illustrée par la flèche F2, la différence B entre la valeur de Somme Ti et le gabarit SeuilEOBD étant négative, l'initialisation se fait alors à zéro en D2 (deuxième distance parcourue max.).Thus, still referring to FIG. 2, at the first reset illustrated by the arrow F1, the counter Sum Ti is reset to the value A, which corresponds to the same value A representing the difference between the Sum value. Ti and the threshold value E oBD at first maximum distance traveled Dl. At the second reset illustrated by the arrow F2, the difference B between the value of Sum Ti and the template ThresholdEOBD being negative, the initialization is then zeroed in D2 (second distance traveled max.).
[0029] Si la valeur de Somme Ti a dépassé la valeur de SeuilEoBD,la fonction «Stop and Start» est à nouveau active dès que la valeur de Somme Ti repasse sous la valeur de SeuilEOBD». On notera que tous les seuils définis dans cette partie sont calibrables. Cette fonction est calibrée de manière à désactiver la fonction « Stop and Start» avant de dépasser les seuils OBD.If the value of Sum Ti has exceeded the value of SeuilEoBD, the function "Stop and Start" is active again as soon as the value of Sum Ti returns below the value of ThresholdEOBD ". Note that all the thresholds defined in this section are calibrated. This function is calibrated to disable the "Stop and Start" function before exceeding the OBD thresholds.
[0030] Dès que la valeur de «Somme Ti» dépasse la valeur de SeuilEOBD, on considère qu'il y a un défaut, mais ce défaut n'est confirmé qu'au bout de 3 cycles de conduite consécutifs : un code défaut est mémorisé mais on n'allume pas le témoin indicateur de dysfonctionnement ou «MIL ». As soon as the value of "Sum Ti" exceeds the value of ThresholdEOBD, it is considered that there is a defect, but this fault is confirmed only after 3 consecutive driving cycles: a fault code is memorized but does not turn on the malfunction indicator light or "MIL".

Claims

REVENDICATIONS
1. Procédé pour identifier les seuils d'émission de gaz polluants en vue de commander le fonctionnement en mode « Stop and Start» d'arrêt d'un moteur juste avant et pendant l'immobilisation d'un véhicule automobile, caractérisé par les étapes suivantes :A method for identifying pollutant gas emission thresholds for controlling the stop and start operation of an engine just before and during the immobilization of a motor vehicle, characterized by the steps of following:
- on calcule, sur chaque redémarrage, la quantité de carburant injectée,the amount of fuel injected is calculated on each restart,
- on fait la différence entre la quantité de carburant injectée et la quantité de carburant normale nécessaire, ladite quantité résultante étant considérée représenter la quantité de carburant injectée mais non brûlée,the difference between the quantity of fuel injected and the quantity of normal fuel required, the said resultant quantity being considered to represent the quantity of fuel injected but not burned,
- on compare ladite quantité de carburant injectée mais non brûlée à une valeur de seuil prédéterminée, en fonction de la distance parcourue,comparing the quantity of fuel injected but not burned with a predetermined threshold value, as a function of the distance traveled,
- on inhibe ou non le fonctionnement en mode « Stop and Start » selon que ladite quantité de carburant injectée mais non brûlée est supérieure ou non à la valeur de seuil prédéterminée.the operation in "Stop and Start" mode is inhibited or not according to whether the said quantity of fuel injected but not burned is greater than or not greater than the predetermined threshold value.
2. Procédé selon la revendication 1, caractérisé en ce que le calcul de la quantité de carburant injectée mais non brûlée est un calcul itératif et par sommation, de manière à calculer la somme des quantités de carburant injectées mais non brûlées pour une série de redémarrages entre deux arrêts du moteur au moyen de la clé de contact.2. Method according to claim 1, characterized in that the calculation of the amount of fuel injected but not burned is an iterative calculation and summation, so as to calculate the sum of the fuel quantities injected but not burned for a series of restarts between two stops of the engine by means of the key of contact.
3. Procédé selon la revendication 2, caractérisé en ce que, à chaque fois que le compteur de distance parcourue repasse à zéro, la valeur de la somme des quantités de carburant injectées mais non brûlées est réinitialisée à une valeur obtenue par différence entre ladite somme juste avant réinitialisation et une valeur de seuil prédéterminée, lorsque cette différence est positive, et est réinitialisée à la valeur zéro lorsque ladite différence est négative.3. Method according to claim 2, characterized in that, each time the traveled distance counter returns to zero, the value of the sum of the quantities of fuel injected but not burned is reset to a value obtained by difference between said sum just before reset and a predetermined threshold value, when this difference is positive, and reset to zero when said difference is negative.
4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il est répété sur au moins trois cycles de conduite, et qu'il comporte, de plus, l'étape suivante:4. Method according to any one of claims 1 to 3, characterized in that it is repeated over at least three driving cycles, and that it comprises, in addition, the following step:
- on mémorise chaque dépassement de ladite quantité de carburant injectée mais non brûlée par rapport à la valeur de seuil prédéterminée,storing each overshoot of said quantity of fuel injected but not burned with respect to the predetermined threshold value,
- on adresse un code défaut si ledit dépassement se confirme sur trois cycles de conduite. a fault code is addressed if said overrun is confirmed over three driving cycles.
EP06726239A 2006-03-13 2006-03-13 Method for identifying the thresholds at which pollutant gases are emitted with a view to controlling the operation of a motor vehicle in stop and start mode Withdrawn EP1994270A1 (en)

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US20090055075A1 (en) 2009-02-26
WO2007104840A1 (en) 2007-09-20
CN101400879B (en) 2010-12-01
JP4688935B2 (en) 2011-05-25
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