FR2883035A1 - Gas pollutant e.g. hydrocarbon, emission threshold identifying method for motor vehicle, involves inhibiting/not inhibiting operation in start and stop mode, depending on whether unburnt fuel quantity is greater/lesser than preset value - Google Patents
Gas pollutant e.g. hydrocarbon, emission threshold identifying method for motor vehicle, involves inhibiting/not inhibiting operation in start and stop mode, depending on whether unburnt fuel quantity is greater/lesser than preset value Download PDFInfo
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- FR2883035A1 FR2883035A1 FR0550626A FR0550626A FR2883035A1 FR 2883035 A1 FR2883035 A1 FR 2883035A1 FR 0550626 A FR0550626 A FR 0550626A FR 0550626 A FR0550626 A FR 0550626A FR 2883035 A1 FR2883035 A1 FR 2883035A1
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- burned
- fuel injected
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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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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- 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
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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
Description
PROCEDE POUR IDENTIFIER LES SEUILS D'EMISSION DE GAZ POLLUANTS EN VUE DEMETHOD FOR IDENTIFYING THRESHOLDS OF POLLUTANT GAS EMISSIONS FOR
COMMANDER LE FONCTIONNEMENT D'UN VEHICULE AUTOMOBILE EN MODE STOP AND START TO CONTROL THE OPERATION OF A MOTOR VEHICLE IN STOP AND START MODE
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 pollutant gas emission thresholds for controlling the stop and start mode operation of an engine just before and during the immobilization of a motor vehicle, and the restart instantly at the first driver request.
Le système Stop and Start (STT) 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 Stop and Start (STT) system is a system in which the engine stops just before and during the immobilisation 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.
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. EOBD is a monitoring software integrated into the engine control ECU, 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 cause an emission threshold to be exceeded, so that he can have the vehicle repaired.
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. The risk associated with the EOBD is the accumulation of difficult restarts on the cycle, which may lead to exceeding the OBD emission thresholds (On-Board 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 in Europe, according to the European standards in force.
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 35 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 35 NOx).
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 . If there is a problem with the function resulting in abnormally high emissions, the Stop and Start function must be inhibited before this causes the big polluter thresholds to be exceeded.
Pour atteindre ce but, selon le procédé de l'invention: - on calcule, sur chaque redémarrage, la quantité de carburant injectée, - 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, - on compare ladite quantité de carburant injectée mais non brûlée à une valeur de seuil prédéterminée, en fonction de la distance parcourue, - 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: - the amount of fuel injected is calculated on each restart, - the difference between the quantity of fuel injected and the quantity of normal fuel required is determined, the said resulting quantity being considered to represent the quantity of fuel injected but not burned, - the injected but unburned quantity of fuel is compared with a predetermined threshold value, as a function of the distance traveled, - the operation in stop and start mode is inhibited or not depending on whether said quantity of fuel injected but not burned is greater than or not the predetermined threshold value.
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 quantity of fuel injected but not burned is an iterative and summation calculation, so as to calculate the sum of fuel quantities injected but not burned for a series of restarts between two engine restarts using the ignition key.
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 distance counter traveled 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.
De manière préférentielle, le procédé est répété sur au moins trois cycles de conduite, et il comporte, de plus, l'étape suivante: - on mémorise chaque dépassement de ladite quantité de carburant injectée mais non brûlée par rapport à la valeur de seuil prédéterminée, - on adresse un code défaut si ledit dépassement se confirme sur trois cycles de conduite. Preferably, the method is repeated over at least three driving cycles, and it comprises, in addition, the following step: - it memorizes each exceeding of said injected but unburned fuel quantity with respect to the predetermined threshold value , - a fault code is addressed if said overrun is confirmed over three driving cycles.
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: 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. Other characteristics 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 purposes and in which: FIG. 1 is a graph representative of an emission threshold according to the EOBD according to the distance traveled (also referred to as the EOBD threshold gauge) since the activation of the ignition contact by the ignition key.
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. FIG. 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 the Stop and Start mode of the motor.
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 exceeding the OBD emission thresholds, a restart quality indicator is defined, as explained below. 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.
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, the quantity of gasoline injected is calculated and compared with the quantity of petrol 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 to the level of unburned hydrocarbons (HC) which is a pollutant-heavy 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.
Chaque cycle, entre deux démarrages avec la clé de contact, comporte une série de démarrage et redémarrages, que l'on peut nommer 1, 30 2, .., i, . .. Each cycle, between two starts with the ignition key, comprises a series of startups and restarts, which can be named 1, 30 2, .., i,. ..
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): Ti = (E Tin; ) Mnom On notera que la valeur de Ti est minorée par O. On incrémente, à chaque (re)démarrage, un compteur sommant ces valeurs de gaz non brûlés Ti. Ce compteur Somme Ti est initialisé à 5 0 à chaque contact démarrage à la clé. In the first place, the quantities of gasoline injected Tinj are summed during a (re) start (in grams). This value is subtracted from the nominal quantity Mnom, which is itself a function of the water temperature necessary for (re) starting. We deduce the amount of gasoline injected that has not burned (Ti): Ti = (E Tin;) Mnom Note that the value of Ti is decreased by O. We increment, at each (re) start, a counter summing these unburned gas values Ti. This Sum counter Ti is initialized to 50 at each key start contact.
Somme Ti = E Ti (sur les démarrages) Ensuite, on relève la valeur de la Distance parcourue depuis la mise en marche avec la clé. Sum Ti = E Ti (on starts) Then, the value of the Distance traveled since the start with the key is noted.
On inhibe la fonction Stop and Start , Si l'inégalité suivante est 10 respectée, à savoir, c'est-à-dire SI: Somme Ti > Seuil EOBD 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 Stop and Start function is inhibited if the following inequality is observed, i.e. SI: Sum Ti> EOBD Threshold The EOBD Threshold template is defined by three parameters, namely InitEBDB, DistEOBD and Calibrated EOBD slope. It has the shape shown in the drawing of Figure 1 according to said distance traveled.
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 InitEoBD 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 0 au point paramétré de coordonnées InitEOBD et DistEOBD. L'origine 0 correspond au démarrage par la clé de contact. As can be seen in the drawing of Figure 1, the curve has an initial flat section that is intended to allow the Stop and Start, even after a difficult first start. It is parameterized by InitEoBD on the ordinate axis or axis of the thresholds EOBD and DistEOBD 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 0 to the set point of coordinates InitEOBD and DistEOBD. The origin 0 corresponds to the start by the ignition key.
En se référant ensuite à la figure 2, le compteur Somme Ti est réinitialisé lorsque le compteur de distance parcourue repasse à 0, c'està 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 0, mais à l'écart entre le compteur Somme Ti et le gabarit Seuil EOBD 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). Referring next to FIG. 2, the counter Sum Ti is reset when the traveled distance counter returns to 0, ie to 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 0, but at the distance between the counter Sum Ti and the mask EOBD threshold maximum distance traveled, the value of said template being represented in solid lines in the drawing of FIG. reset is always positive (the positive pollution reserve is not taken into account just before resetting).
Ainsi, en se référant toujours à la figure 2, à la première réinitialisation illustrée par la flèche F1, 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 Seuil EOBD 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 value of Sum Ti and the value of ThresholdEOBD at first maximum traveled distance Dl. At the second reset illustrated by the arrow F2, the difference B between the value of Sum Ti and the threshold gauge EOBD being negative, the initialization is then zero in D2 (second distance traveled max.).
Si la valeur de Somme Ti a dépassé la valeur de SeuiIEOBD, 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 SeuiIEOBD, the Stop and Start function is active again as soon as the value of Sum Ti falls 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.
Dès que la valeur de Somme Ti dépasse la valeur de Seui1EOBD, 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 Seui1EOBD, it is considered that there is a defect, but this defect is confirmed only after 3 consecutive driving cycles: a fault code is stored but no do not turn on the malfunction indicator light or MIL.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0550626A FR2883035B1 (en) | 2005-03-10 | 2005-03-10 | METHOD FOR IDENTIFYING THRESHOLDS OF POLLUTANT GAS EMISSIONS FOR CONTROLLING THE OPERATION OF A MOTOR VEHICLE IN "STOP AND START" MODE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0550626A FR2883035B1 (en) | 2005-03-10 | 2005-03-10 | METHOD FOR IDENTIFYING THRESHOLDS OF POLLUTANT GAS EMISSIONS FOR CONTROLLING THE OPERATION OF A MOTOR VEHICLE IN "STOP AND START" MODE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2883035A1 true FR2883035A1 (en) | 2006-09-15 |
| FR2883035B1 FR2883035B1 (en) | 2007-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0550626A Expired - Fee Related FR2883035B1 (en) | 2005-03-10 | 2005-03-10 | METHOD FOR IDENTIFYING THRESHOLDS OF POLLUTANT GAS EMISSIONS FOR CONTROLLING THE OPERATION OF A MOTOR VEHICLE IN "STOP AND START" MODE |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007104840A1 (en) * | 2006-03-13 | 2007-09-20 | Peugeot Citroën Automobiles Sa. | 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 |
| EP1998033A3 (en) * | 2007-05-23 | 2010-11-10 | Denso Corporation | Engine controller |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020157651A1 (en) * | 2001-04-27 | 2002-10-31 | Toyota Jidosha Kabushiki Kaisha | Method of operating vehicular internal combustion engine of an intermittent-operation type |
| GB2390438A (en) * | 2002-07-01 | 2004-01-07 | London Taxis Internat Ltd | Vehicle control and warning system. |
| US20040206325A1 (en) * | 2003-04-16 | 2004-10-21 | Ford Global Technologies, Llc | A method and system for controlling a belt-driven integrated starter generator |
| FR2858665A1 (en) * | 2003-08-08 | 2005-02-11 | Renault Sa | Motor vehicle driving assembly controlling method, involves starting heat engine by applying consigned value of current function temperature measurement corresponding to heat engine, to alternator |
-
2005
- 2005-03-10 FR FR0550626A patent/FR2883035B1/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020157651A1 (en) * | 2001-04-27 | 2002-10-31 | Toyota Jidosha Kabushiki Kaisha | Method of operating vehicular internal combustion engine of an intermittent-operation type |
| GB2390438A (en) * | 2002-07-01 | 2004-01-07 | London Taxis Internat Ltd | Vehicle control and warning system. |
| US20040206325A1 (en) * | 2003-04-16 | 2004-10-21 | Ford Global Technologies, Llc | A method and system for controlling a belt-driven integrated starter generator |
| FR2858665A1 (en) * | 2003-08-08 | 2005-02-11 | Renault Sa | Motor vehicle driving assembly controlling method, involves starting heat engine by applying consigned value of current function temperature measurement corresponding to heat engine, to alternator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007104840A1 (en) * | 2006-03-13 | 2007-09-20 | Peugeot Citroën Automobiles Sa. | 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 |
| US7801663B2 (en) | 2006-03-13 | 2010-09-21 | Peugeot Citroen Automobiles Sa | 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 |
| EP1998033A3 (en) * | 2007-05-23 | 2010-11-10 | Denso Corporation | Engine controller |
| US7971570B2 (en) | 2007-05-23 | 2011-07-05 | Denso Corporation | Engine controller |
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| Publication number | Publication date |
|---|---|
| FR2883035B1 (en) | 2007-05-18 |
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