EP0701049B1 - Method of controlling an internal combustion engine - Google Patents

Method of controlling an internal combustion engine Download PDF

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Publication number
EP0701049B1
EP0701049B1 EP19950401977 EP95401977A EP0701049B1 EP 0701049 B1 EP0701049 B1 EP 0701049B1 EP 19950401977 EP19950401977 EP 19950401977 EP 95401977 A EP95401977 A EP 95401977A EP 0701049 B1 EP0701049 B1 EP 0701049B1
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EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
acceleration
engine
fuel
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EP19950401977
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German (de)
French (fr)
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EP0701049A1 (en
Inventor
Patrice Faraon
Philippe Renoux
Frédéric Thomas
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Renault SAS
Regie Nationale des Usines Renault
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Renault SAS
Regie Nationale des Usines Renault
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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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/10—Introducing corrections for particular operating conditions for acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • 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
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period

Definitions

  • the present invention relates to a control method an internal combustion engine fitted to a vehicle automobile of the type comprising an electronic control of the quantity of fuel injected.
  • the invention relates more particularly to a method for controlling an internal combustion engine fitted to a motor vehicle to eliminate possible phenomena torque jerks that can occur under conditions vehicle operating conditions.
  • control type motor control parameters injection electronics i.e. injection time or the ignition advance are adjusted to eliminate oscillations by monitoring the motor torque to the wheels and correcting in the control loop the value of the control parameter (s) chosen as a function the amplitude of the oscillations detected.
  • the aim of the present invention is therefore to propose a method of controlling an internal combustion engine which remedies the disadvantages of the prior art by removing the appearance of sudden and particularly simple.
  • the method according to the invention relates to control an internal combustion engine fitted to a vehicle automobile of the type comprising an electronic control system for fuel injection cooperating with means for detecting engine operating conditions, this process making it possible to calculate the quantity of fuel to be injected according to the conditions of engine operation according to an appropriate formula.
  • the calculation formula is corrected to deplete the amount of fuel injected so as to produce a smooth progressive acceleration (compare with FR-A- 2 414 629).
  • the method for controlling an internal combustion engine object of the invention is characterized in that under acceleration conditions predetermined, the calculation formula is corrected taking into account the estimation of the intensity of the acceleration.
  • a corrective term is introduced in the formula to deplete the amount of fuel as well calculated, this corrective term then being gradually modified to bring the correction to zero.
  • the operated depletion is thus adjusted as well in terms of level and duration, so that maintain a satisfactory response time from the vehicle to the driver acceleration request and so as not increase pollutant emissions.
  • the predetermined acceleration conditions include the acceleration phases occurring following a deceleration phase.
  • the deceleration phase is defined on the one hand, by keeping the accelerator pedal in the position foot raised for a period greater than a first value threshold and secondly, by a vehicle speed automobile greater than a second threshold value.
  • the level and duration of the depletion of the amount of fuel injected take into account engine operating conditions.
  • the intensity of the acceleration is directly deduced from the movement of the accelerator pedal as well as of the speed of this movement.
  • Figure 1 shows an internal combustion engine multicylinder 1 with spark ignition fitted to a vehicle automobile or road and having an electronic system control of the quantity of fuel injected putting in implements the control method according to the invention.
  • Each of the combustion chambers 12 of the engine is supplied with fresh combustion air from a manifold intake 3 conventionally fitted upstream of a throttle valve gas 4 controlling the air flow drawn in by the engine.
  • the manifold 3 is also equipped with a bypass pipe throttle valve 4, fitted with a control valve for engine idling.
  • Air intake in combustion chamber 12 is conventionally governed by the control of a valve intake 11 with rod operated by a system of adapted distribution not shown. As for the injection of fuel, it is operated by an electro-injector 2 fueled at a certain pressure constant and arranged on the air intake circuit, in upstream of the intake valve 11.
  • each electro-injector 2 is controlled by an electronic control system 7, which calculates according to a predetermined formula the quantity of fuel to be injected according to the conditions of operation of motor 1 in the form of a duration opening of the injector 2.
  • the engine control system 7 are memorized basic formulas and parameters for tuning optimal of the engine, these parameters being obtained beforehand at the engine test stand. These are for example the parameters concerning the injection start time or phase injecting fuel into each of the engine chambers, the fuel injection duration which corresponds to a quantity of fuel injected, or even the phase spark plugs.
  • the electronic system 7 conventionally comprises a central processing unit CPU, random access memory RAM, read only memory ROM, analog-to-digital A / D converters, and different input and output interfaces. He receives different input signals characteristic of the motor functioning and organs interacting with it the latter provided by corresponding detection means, performs operations and generates output signals to destination in particular of injectors 2.
  • the different engine control strategies, formulas and parameters or calibrations are stored in ROM.
  • the input signals are those emitted by a crankshaft sensor 8 which allows the tracking of the passage at top dead center of each of the cylinders, and the determination of the engine rotation speed. These signals allow, coupled in particular to those emitted by a camshaft sensor not shown, to phase the instants injection with engine operation.
  • a sensor pressure 9 arranged in the downstream intake manifold throttle valve 6, associated position sensors respectively to the throttle valve 4 and to the idle regulation, as well as sensors for measuring the coolant and air temperature intake, and a wealth sensor, not shown, arranged on the exhaust line of the burnt gases from the engine allowing follow the air fuel ratio.
  • the formula for calculating the amount of fuel is corrected to temporarily deplete the amount of fuel injected so as to limit the engine torque and produce a smooth acceleration.
  • Figure 2 illustrates influence during such accelerations of impoverishment on the torque C transmitted to the vehicle wheels, the curve (I) corresponding to the implementation of the formula without correction while the curve (II) corresponding to the bet implementation of the correction according to the invention.
  • the predetermined acceleration conditions during which correction is implemented according to the invention are the acceleration phases occurring immediately after a deceleration phase.
  • control system 7 has position information of the accelerator pedal either by a suitable sensor or still via the throttle position sensor gas.
  • the deceleration phase is then defined by the recognition of the foot raised position of the pedal accelerator.
  • This corrective term can for example take the form of a multiplicative gain G as shown in figure 3.
  • the gain G is initially brought to a certain predetermined value strictly between “0" and “1”, then it is then gradually reduced to the value "1" by successive increases at each breakeven point High, so as to bring the correction to zero after one adjusted time frame.
  • the initial value then the evolution of the gain G are deduced from predetermined tables taking into account the engine operating conditions including engine speed, manifold pressure values intake, and gearbox gear engaged.
  • the value of the gain G is also adjusted based on an estimate of the intensity of the acceleration deduced from the displacement of the accelerator pedal as well as the speed of this displacement.
  • the engine control system can be applied when ordering a single-point injection. He can also be used for compression ignition engines comprising an electronic device for controlling the amount of fuel injected.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Description

La présente invention concerne un procédé de contrôle d'un moteur à combustion interne équipant un véhicule automobile du type comportant un système électronique de commande de la quantité de carburant injectée.The present invention relates to a control method an internal combustion engine fitted to a vehicle automobile of the type comprising an electronic control of the quantity of fuel injected.

L'invention concerne plus particulièrement un procédé de contrôle d'un moteur à combustion interne équipant un véhicule automobile pour éliminer les éventuels phénomènes d'à-coups de couple pouvant survenir lors de conditions particulières de fonctionnement du véhicule.The invention relates more particularly to a method for controlling an internal combustion engine fitted to a motor vehicle to eliminate possible phenomena torque jerks that can occur under conditions vehicle operating conditions.

Il est connu que dans certaines conditions de fonctionnement d'un véhicule automobile équipé d'un moteur à combustion interne, notamment en régimes transitoires (accélérations vives, etc.), on observe des phénomènes d'oscillations du couple transmis aux roues du véhicule encore appelées à-coups qui affectent alors le confort des passagers du véhicule.It is known that under certain conditions of operation of a motor vehicle equipped with a internal combustion, especially in transient regimes (sharp accelerations, etc.), we observe phenomena torque oscillations transmitted to the vehicle wheels also called jerks which then affect the comfort of vehicle passengers.

Ces oscillations ont pour origine la chaíne cinématique liant le moteur à l'interface pneu/sol. En effet, l'énergie mécanique en bout de vilebrequin est transmise aux roues par un système de transmission comprenant traditionnellement un embrayage, une boíte de vitesses et un différentiel, qui possède un amortissement et une rigidité propre. Il en résulte donc, que toute variation brusque du couple moteur au niveau du vilebrequin est répercutée aux roues avec des oscillations dont l'importance va dépendre des caractéristiques du système de transmission.These oscillations originate from the chain kinematics linking the engine to the tire / ground interface. Indeed, mechanical energy at the end of the crankshaft is transmitted to wheels by a transmission system comprising traditionally a clutch, a gearbox and a differential, which has damping and stiffness clean. It therefore follows that any sudden variation in the engine torque at the crankshaft is passed on to wheels with oscillations whose importance will depend on characteristics of the transmission system.

Pour remédier à ces oscillations de couples, de nombreuses stratégies ont été élaborées. Il est ainsi connu dans l'art antérieur, notamment par les documents EP-A-461504 et WO-A-90/06441, de réguler le couple d'un moteur de façon à réduire ou supprimer la perception des oscillations de couple, par le conducteur du véhicule. Pour ce faire, les paramètres de contrôle des moteurs du type à commande électronique de l'injection, à savoir le temps d'injection ou l'avance à l'allumage sont ajustés pour éliminer les oscillations en effectuant la surveillance du couple moteur aux roues et en corrigeant dans la boucle de commande la valeur du ou des paramètres de contrôle choisis en fonction de l'amplitude des oscillations détectées.To remedy these couple oscillations, many strategies have been developed. He is thus known in the prior art, in particular by documents EP-A-461504 and WO-A-90/06441, to regulate the torque of an engine so as to reduce or eliminate the perception of the oscillations of torque, by the driver of the vehicle. To do this, control type motor control parameters injection electronics, i.e. injection time or the ignition advance are adjusted to eliminate oscillations by monitoring the motor torque to the wheels and correcting in the control loop the value of the control parameter (s) chosen as a function the amplitude of the oscillations detected.

De telles méthodes présentent toutefois certains inconvénients, à savoir une grande complexité dans la relation liant la variation du couple et la correction à apporter au (ou aux) paramètres de contrôle choisis nécessitant l'utilisation de systèmes électroniques de commande de fortes capacités et par ailleurs le non traitement de l'à-coup initial puisque les corrections ne sont opérées qu'après détection des premières oscillations du véhicule.However, such methods have certain disadvantages, namely a great complexity in the relationship between torque variation and correction to bring to the chosen control parameter (s) requiring the use of electronic systems of command of high capacities and moreover the no treatment of the initial jerk since the corrections do not are operated only after detection of the first oscillations of the vehicle.

Le but de la présente invention est donc de proposer un procédé de contrôle d'un moteur à combustion interne qui remédie aux inconvénients de l'art antérieur en supprimant l'apparition de tout à-coups et ce de façon particulièrement simple.The aim of the present invention is therefore to propose a method of controlling an internal combustion engine which remedies the disadvantages of the prior art by removing the appearance of sudden and particularly simple.

Le procédé selon l'invention, a trait au contrôle d'un moteur à combustion interne équipant un véhicule automobile du type comportant un système électronique de commande de l'injection de carburant coopérant avec des moyens de détection des conditions de fonctionnement du moteur, ce procédé permettant de calculer la quantité de carburant à injecter en fonction des conditions de fonctionnement du moteur suivant une formule appropriée. Dans des conditions d'accélération prédéterminées, la formule de calcul est corrigée pour appauvrir la quantité de carburant injectée de façon à produire une accélération progressive sans à-coups (à comparer avec FR-A- 2 414 629).The method according to the invention relates to control an internal combustion engine fitted to a vehicle automobile of the type comprising an electronic control system for fuel injection cooperating with means for detecting engine operating conditions, this process making it possible to calculate the quantity of fuel to be injected according to the conditions of engine operation according to an appropriate formula. In predetermined acceleration conditions, the calculation formula is corrected to deplete the amount of fuel injected so as to produce a smooth progressive acceleration (compare with FR-A- 2 414 629).

Selon l'invention, le procédé de contrôle d'un moteur à combustion interne objet de l'invention est caractérisé en ce que dans des conditions d'accélération prédéterminées, la formule de calcul est corrigée prenant en compte l'estimation de l'intensité de l'accélération. According to the invention, the method for controlling an internal combustion engine object of the invention is characterized in that under acceleration conditions predetermined, the calculation formula is corrected taking into account the estimation of the intensity of the acceleration.

L'estompage du couple moteur induit par l'appauvrissement des quantités de carburant injectées permet de supprimer, ou pour le moins de réduire, la perception de l'à-coup initial et les balancements résultant. Contrairement aux méthodes connues, cette solution procède par anticipation en identifiant des conditions particulières de fonctionnement propices à l'apparition des à-coups de couple et en mettant alors immédiatement en oeuvre une stratégie de correction.The reduction in engine torque induced by the depletion of the quantities of fuel injected allows to suppress, or at least to reduce, the perception of the initial jerk and the resulting swings. In contrary with known methods, this solution proceeds in anticipation identifying specific operating conditions conducive to the appearance of torque jolts and putting then immediately implement a remedial strategy.

Selon une autre caractéristique du procédé de contrôle d'un moteur à combustion interne objet de l'invention, dans les conditions d'accélération prédéterminées, un terme correctif est introduit dans la formule pour appauvrir la quantité de carburant ainsi calculée, ce terme correctif étant ensuite graduellement modifié pour ramener la correction à zéro.According to another characteristic of the control of an internal combustion engine object of the invention, under the conditions of acceleration predetermined, a corrective term is introduced in the formula to deplete the amount of fuel as well calculated, this corrective term then being gradually modified to bring the correction to zero.

L'appauvrissement opéré est ainsi ajusté aussi bien pour ce qui est de son niveau que de sa durée, de façon à conserver un temps de réponse satisfaisant du véhicule à la demande d'accélération du conducteur et de façon à ne pas accroítre les émissions de polluants.The operated depletion is thus adjusted as well in terms of level and duration, so that maintain a satisfactory response time from the vehicle to the driver acceleration request and so as not increase pollutant emissions.

Selon une autre caractéristique du procédé de contrôle d'un moteur à combustion interne objet de l'invention, les conditions d'accélération prédéterminées comprennent les phases d'accélération survenant consécutivement à une phase de décélération.According to another characteristic of the control of an internal combustion engine object of the invention, the predetermined acceleration conditions include the acceleration phases occurring following a deceleration phase.

Il est en effet apparu que parmi les régimes transitoires ceux définis par l'enchaínement d'une phase de décélération suivi d'une phase d'accélération étaient générateurs des à-coups les plus violents, et que leur traitement permettait de supprimer la perception des à-coups de couples pour le conducteur.Indeed, it appeared that among the diets transient those defined by the sequence of a phase of deceleration followed by an acceleration phase were the most violent jolts, and that their treatment eliminated the perception of jolts of couples for the driver.

Selon une autre caractéristique du procédé de contrôle d'un moteur à combustion interne objet de l'invention, la phase de décélération est définie d'une part, par le maintien de la pédale d'accélérateur dans la position pied levé pendant une durée supérieure à une première valeur de seuil et d'autre part, par une vitesse du véhicule automobile supérieure à une seconde valeur de seuil.According to another characteristic of the control of an internal combustion engine object of the invention, the deceleration phase is defined on the one hand, by keeping the accelerator pedal in the position foot raised for a period greater than a first value threshold and secondly, by a vehicle speed automobile greater than a second threshold value.

Selon une autre caractéristique du procédé de contrôle d'un moteur à combustion interne objet de l'invention, le niveau et la durée de l'appauvrissement de la quantité de carburant injectée prennent en compte les conditions de fonctionnement du moteur.According to another characteristic of the control of an internal combustion engine object of the invention, the level and duration of the depletion of the amount of fuel injected take into account engine operating conditions.

Selon une autre caractéristique du procédé de contrôle d'un moteur à combustion interne objet de l'invention, l'intensité de l'accélération est directement déduite du déplacement de la pédale d'accélérateur ainsi que de la vitesse de ce déplacement. According to another characteristic of the control of an internal combustion engine object of the invention the intensity of the acceleration is directly deduced from the movement of the accelerator pedal as well as of the speed of this movement.

On comprendra mieux les buts, aspects et avantages de la présente invention, d'après la description donnée ci-après d'un mode de réalisation de l'invention appliqué à un moteur quatre temps à allumage commandé équipant un véhicule automobile, ce mode de réalisation étant donné à titre d'exemple non limitatif, en se référant au dessin annexé, dans lequel :

  • la figure 1 est une vue schématique en coupe d'un moteur à combustion interne équipant un système de contrôle mettant en oeuvre le procédé objet de l'invention ;
  • la figure 2 est un graphique montrant les effets sur le couple transmis au roues du véhicule du procédé objet de l'invention ;
  • la figure 3 est un graphique montrant l'évolution en fonction du temps du terme correcteur introduit dans le calcul de la quantité de carburant injecté selon l'invention.
    • The aims, aspects and advantages of the present invention will be better understood from the description given below of an embodiment of the invention applied to a four-stroke spark-ignition engine fitted to a motor vehicle, this mode of embodiment given by way of nonlimiting example, with reference to the appended drawing, in which:
  • Figure 1 is a schematic sectional view of an internal combustion engine fitted to a control system implementing the method of the invention;
  • FIG. 2 is a graph showing the effects on the torque transmitted to the wheels of the vehicle of the process which is the subject of the invention;
  • FIG. 3 is a graph showing the change over time in the corrector term introduced into the calculation of the quantity of fuel injected according to the invention.

    • Seuls les éléments du moteur nécessaires à la compréhension de l'invention ont été figurés.Only the engine components necessary for the understanding of the invention have been figured.

    La figure 1 présente un moteur à combustion interne multicylindre 1 à allumage commandé équipant un véhicule automobile ou routier et comportant un système électronique de commande de la quantité de carburant injectée mettant en oeuvre le procédé de commande selon l'invention.Figure 1 shows an internal combustion engine multicylinder 1 with spark ignition fitted to a vehicle automobile or road and having an electronic system control of the quantity of fuel injected putting in implements the control method according to the invention.

    Chacune des chambres de combustion 12 du moteur est alimentée en air frais comburant depuis un collecteur d'admission 3 muni classiquement en amont d'un papillon des gaz 4 pilotant le débit d'air aspiré par le moteur. Le collecteur 3 est également équipé d'une conduite de by-pass du papillon 4, muni d'une vanne de régulation pour les fonctionnements du moteur au ralenti. Each of the combustion chambers 12 of the engine is supplied with fresh combustion air from a manifold intake 3 conventionally fitted upstream of a throttle valve gas 4 controlling the air flow drawn in by the engine. The manifold 3 is also equipped with a bypass pipe throttle valve 4, fitted with a control valve for engine idling.

    L'admission de l'air dans la chambre de combustion 12 est classiquement régie par la commande d'une soupape d'admission 11 à tige manoeuvrée par un système de distribution adapté non figuré. Quant à l'injection de carburant, elle est opérée par un électro-injecteur 2 alimenté par du carburant sous une pression déterminée constante et disposé sur le circuit d'admission en air, en amont de la soupape d'admission 11.Air intake in combustion chamber 12 is conventionally governed by the control of a valve intake 11 with rod operated by a system of adapted distribution not shown. As for the injection of fuel, it is operated by an electro-injector 2 fueled at a certain pressure constant and arranged on the air intake circuit, in upstream of the intake valve 11.

    L'ouverture de chaque électro-injecteur 2 est commandée par un système électronique de contrôle 7, qui calcule suivant une formule prédéterminée la quantité de carburant à injecter en fonction des conditions de fonctionnement du moteur 1 sous la forme d'une durée d'ouverture de l'injecteur 2.The opening of each electro-injector 2 is controlled by an electronic control system 7, which calculates according to a predetermined formula the quantity of fuel to be injected according to the conditions of operation of motor 1 in the form of a duration opening of the injector 2.

    Dans le système de contrôle moteur 7 sont mémorisés les formules et les paramètres fondamentaux pour le réglage optimal du moteur, ces paramètres étant obtenus préalablement au banc d'essai du moteur. Ce sont par exemple les paramètres concernant l'instant de début d'injection ou phase d'injection du carburant dans chacune des chambres du moteur, la durée d'injection de carburant qui correspond à une quantité de carburant injectée, ou bien encore la phase d'allumage des bougies.In the engine control system 7 are memorized basic formulas and parameters for tuning optimal of the engine, these parameters being obtained beforehand at the engine test stand. These are for example the parameters concerning the injection start time or phase injecting fuel into each of the engine chambers, the fuel injection duration which corresponds to a quantity of fuel injected, or even the phase spark plugs.

    Le système électronique 7 comprend classiquement une unité centrale CPU, une mémoire vive RAM, une mémoire morte ROM, des convertisseurs analogiques-numériques A/D, et différentes interfaces d'entrées et de sorties. Il reçoit différents signaux d'entrée caractéristiques du fonctionnement moteur et des organes inter-agissant avec ce dernier fournis par des moyens de détection correspondant, effectue des opérations et génère des signaux de sortie à destination notamment des injecteurs 2. Les différentes stratégies de commande du moteur, formules et paramètres ou calibrations sont stockées dans la mémoire morte ROM. The electronic system 7 conventionally comprises a central processing unit CPU, random access memory RAM, read only memory ROM, analog-to-digital A / D converters, and different input and output interfaces. He receives different input signals characteristic of the motor functioning and organs interacting with it the latter provided by corresponding detection means, performs operations and generates output signals to destination in particular of injectors 2. The different engine control strategies, formulas and parameters or calibrations are stored in ROM.

    Parmi les signaux d'entrées figurent ceux émis par un capteur vilebrequin 8 qui permettent le repérage du passage au point mort haut de chacun des cylindres, et la détermination de la vitesse de rotation du moteur. Ces signaux permettent, couplés notamment à ceux émis par un capteur arbre à cames non figuré, de phaser les instants d'injection avec le fonctionnement du moteur.Among the input signals are those emitted by a crankshaft sensor 8 which allows the tracking of the passage at top dead center of each of the cylinders, and the determination of the engine rotation speed. These signals allow, coupled in particular to those emitted by a camshaft sensor not shown, to phase the instants injection with engine operation.

    Parmi les autres signaux d'entrée du système électronique 7, figurent également ceux émis par : un capteur de pression 9 disposé dans le collecteur d'admission en aval du papillon des gaz 6, des capteurs de position associés respectivement au papillon des gaz 4 et à la vanne de régulation ralenti, ainsi que des capteurs de mesure de la température du liquide de refroidissement et de l'air d'admission, et un capteur de richesse non figuré disposé sur la ligne d'échappement des gaz brûlé du moteur permettant de suivre le rapport air carburant.Among other system input signals electronic 7, also those emitted by: a sensor pressure 9 arranged in the downstream intake manifold throttle valve 6, associated position sensors respectively to the throttle valve 4 and to the idle regulation, as well as sensors for measuring the coolant and air temperature intake, and a wealth sensor, not shown, arranged on the exhaust line of the burnt gases from the engine allowing follow the air fuel ratio.

    Conformément aux figures 2 et 3, le procédé de contrôle du moteur à combustion interne 1 est alors le suivant.In accordance with Figures 2 and 3, the method of control of the internal combustion engine 1 is then the following.

    Lors de certaines accélérations du véhicule, la formule de calcul de la quantité de carburant est corrigée pour appauvrir temporairement la quantité de carburant injectée de façon à limiter le couple moteur et produire une accélération progressive sans à-coups. La figure 2 illustre l'influence lors de telles accélérations de l'appauvrissement sur le couple C transmis aux roues du véhicule, la courbe (I) correspondant à la mise en oeuvre de la formule sans correction tandis que la courbe (II) correspondant à la mise en oeuvre de la correction selon l'invention.During certain vehicle accelerations, the formula for calculating the amount of fuel is corrected to temporarily deplete the amount of fuel injected so as to limit the engine torque and produce a smooth acceleration. Figure 2 illustrates influence during such accelerations of impoverishment on the torque C transmitted to the vehicle wheels, the curve (I) corresponding to the implementation of the formula without correction while the curve (II) corresponding to the bet implementation of the correction according to the invention.

    Les conditions d'accélération prédéterminées pendant lesquelles est mis en oeuvre la correction selon l'invention sont les phases d'accélération survenant immédiatement après une phase de décélération.The predetermined acceleration conditions during which correction is implemented according to the invention are the acceleration phases occurring immediately after a deceleration phase.

    Pour identifier la survenue de telles conditions le système de contrôle 7 dispose de l'information position de la pédale d'accélérateur soit par un capteur adapté soit encore par l'intermédiaire du capteur de position du papillon de gaz. La phase de décélération est alors définie par la reconnaissance de la position pied levé de la pédale d'accélérateur.To identify the occurrence of such conditions the control system 7 has position information of the accelerator pedal either by a suitable sensor or still via the throttle position sensor gas. The deceleration phase is then defined by the recognition of the foot raised position of the pedal accelerator.

    Pour discriminer les phases de démarrage et les phases de changement de vitesses, des conditions supplémentaires sont imposées à savoir le maintien de la pédale d'accélérateur dans la position pied levé pendant une durée supérieure à une valeur de seuil et d'autre part une vitesse du véhicule automobile supérieure à une valeur de seuil, ces valeurs étant préalablement calibrées au banc d'essai. Lorsque ces conditions sont réunies un registre d'état spécifique est alors mis à 1 et dès qu'une demande d'accélération est identifiée par l'enfoncement de la pédale d'accélérateur, la stratégie d'appauvrissement selon l'invention est déclenchée.To discriminate between start-up phases and gear change phases, conditions additional are imposed namely the maintenance of the accelerator pedal in the raised foot position during a duration greater than a threshold value and secondly a motor vehicle speed greater than a value of threshold, these values being previously calibrated on the bench test. When these conditions are met a register specific status is then set to 1 and as soon as a request acceleration is identified by depressing the pedal accelerator, the impoverishment strategy according to the invention is launched.

    Pour ce faire, on introduit un terme correctif dans la formule de calcul de la quantité de carburant à injecter sitôt les conditions particulières de d'accélération identifiées. Ce terme correctif peut par exemple prendre la forme d'un gain multiplicatif G tel que représenté à la figure 3. Le gain G est initialement porté à une certaine valeur prédéterminée comprise strictement entre "0" et "1", puis il est ensuite graduellement ramené à la valeur "1" par des augmentations successives opérées à chaque Point Mort Haut, de façon à ramener la correction à zéro au bout d'un laps de temps ajusté. To do this, we introduce a corrective term in the formula for calculating the quantity of fuel to be injected as soon as the special conditions of acceleration identified. This corrective term can for example take the form of a multiplicative gain G as shown in figure 3. The gain G is initially brought to a certain predetermined value strictly between "0" and "1", then it is then gradually reduced to the value "1" by successive increases at each breakeven point High, so as to bring the correction to zero after one adjusted time frame.

    La valeur initiale puis l'évolution du gain G sont déduites de tables prédéterminées prenant en compte les conditions de fonctionnement du moteur et notamment les valeurs du régime moteur, de la pression dans le collecteur d'admission, et du rapport de boíte de vitesses engagé. Bien évidemment, il est également possible d'adapter la valeur du gain G en fonction des valeurs prises par d'autres paramètres caractéristiques du fonctionnement moteur. Par ailleurs, ce gain G est également ajusté en fonction d'une estimation de l'intensité de l'accélération déduite du déplacement de la pédale d'accélérateur ainsi que de la vitesse de ce déplacement.The initial value then the evolution of the gain G are deduced from predetermined tables taking into account the engine operating conditions including engine speed, manifold pressure values intake, and gearbox gear engaged. Well obviously it is also possible to adjust the value of the gain G as a function of the values taken by other parameters characteristics of engine operation. Furthermore, this gain G is also adjusted based on an estimate of the intensity of the acceleration deduced from the displacement of the accelerator pedal as well as the speed of this displacement.

    La grande simplicité du procédé développé permet son implantation même sur des calculateurs de capacité limitée.The great simplicity of the developed process allows its installation even on computers with limited capacity.

    Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit et illustré qui n'a été donné qu'à titre d'exemple.Of course, the invention is in no way limited to described and illustrated embodiment which has only been given as an example.

    Ainsi le système de contrôle moteur peut s'appliquer à la commande d'une injection monopoint. Il peut également être utilisé pour les moteurs à allumage par compression comportant un dispositif électronique de commande de la quantité de carburant injectée.So the engine control system can be applied when ordering a single-point injection. He can also be used for compression ignition engines comprising an electronic device for controlling the amount of fuel injected.

    Par ailleurs, la mise en oeuvre du procédé objet de l'invention peut être réalisée sous diverses formes :

    • soit avec des composants d'électronique analogique pour lesquels les différentiateurs, multiplicateur et autres filtres sont réalisés à l'aide d'amplificateurs opérationnels ;
    • soit avec des composants d'électronique numérique qui réaliseraient la fonction en logique câblée ;
    • soit par un algorithme de traitement du signal implanté sous forme d'un module logiciel composant d'un système logiciel de contrôle moteur faisant fonctionner le microcontrôleur d'un calculateur électronique.
    • soit encore, par une puce spécifique (custom) dont les ressources matériel et logiciel auront été optimisées pour réaliser les fonctions objet de l'invention : puce microprogrammable ou non, encapsulée séparément ou bien tout ou partie d'un coprocesseur implanté dans un microcontrôleur ou microprocesseur etc.
    Furthermore, the implementation of the process which is the subject of the invention can be carried out in various forms:
    • either with analog electronic components for which the differentiators, multiplier and other filters are produced using operational amplifiers;
    • either with digital electronic components which would perform the function in wired logic;
    • either by a signal processing algorithm implemented in the form of a software module component of an engine control software system operating the microcontroller of an electronic computer.
    • or again, by a specific (custom) chip whose hardware and software resources will have been optimized to perform the functions that are the subject of the invention: microprogrammable chip or not, encapsulated separately or else all or part of a coprocessor implanted in a microcontroller or microprocessor etc.

    Claims (6)

    1. A process for management of an internal combustion engine (1) equipping a motor vehicle of the type comprising an electronic system (7) for controlling the injection of fuel co-operating with means (8, 9) for detecting the operating conditions of the engine (1), by which the amount of fuel to be injected is deduced from said operating conditions in accordance with a suitable calculation formula, under predetermined acceleration conditions, said formula is corrected to weaken the amount of fuel injected so as to produce progressive acceleration without jerks, chracterised in that the level and the duration of the weakening of the amount of fuel injected takes account of the estimate of the intensity of acceleration.
    2. A process for management of an internal combustion engine (1) according to claim 1 characterised in that under said predetermined acceleration conditions a correction term (G) is introduced into said formula to weaken the amount of fuel which is thus calculated, said correction term (G) then being gradually modified to reduce the correction to zero.
    3. A process for management of an internal combustion engine (1) according to either one of claims 1 and 2 characterised in that said predetermined acceleration conditions comprise the acceleration phases which occur subsequently to a deceleration phase.
    4. A process for management of an internal combustion engine (1) according to claim 3 characterised in that a deceleration phase is defined on the one hand by maintaining the accelerator pedal in the foot-off position for a period of time greater than a first threshold value and on the other hand by a speed of the motor vehicle that is greater than a second threshold value.
    5. A process for management of an internal combustion engine (1) according to any one of claims 1 to 4 characterised in that the level and the duration of the weakening in the amount of fuel injected takes account of the engine operating conditions.
    6. A process for management of an internal combustion engine (1) according to any one of claims 1 to 5 characterised in that the intensity of acceleration is directly deduced from the displacement of the accelerator pedal (6) and the speed of said displacement.
    EP19950401977 1994-09-06 1995-08-31 Method of controlling an internal combustion engine Expired - Lifetime EP0701049B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9410663 1994-09-06
    FR9410663A FR2724203A1 (en) 1994-09-06 1994-09-06 METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE

    Publications (2)

    Publication Number Publication Date
    EP0701049A1 EP0701049A1 (en) 1996-03-13
    EP0701049B1 true EP0701049B1 (en) 1999-03-24

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    EP (1) EP0701049B1 (en)
    DE (1) DE69508504T2 (en)
    FR (1) FR2724203A1 (en)

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    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102016221285B3 (en) * 2016-10-28 2018-05-03 Robert Bosch Gmbh Method for monitoring the thrust of an internal combustion engine drive in a motor vehicle

    Family Cites Families (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE2801790A1 (en) * 1978-01-17 1979-07-19 Bosch Gmbh Robert METHOD AND EQUIPMENT FOR CONTROLLING THE FUEL SUPPLY TO A COMBUSTION ENGINE
    JPS54108127A (en) * 1978-02-13 1979-08-24 Toyota Motor Corp Electronically-controlled fuel injector
    JPS59183039A (en) * 1983-03-31 1984-10-18 Toyota Motor Corp Fuel control method for engine used in vehicle
    JPS62182454A (en) * 1985-12-26 1987-08-10 Honda Motor Co Ltd Air-fuel ratio control for internal combustion engine
    DE3889928T2 (en) 1988-12-06 1994-09-15 Bosch Gmbh Robert METHOD AND DEVICE FOR REGULATING THE TORQUE OF A MOTOR.
    JP2751571B2 (en) 1990-06-04 1998-05-18 トヨタ自動車株式会社 Fuel injection device for vehicle internal combustion engine
    US5119781A (en) * 1991-02-28 1992-06-09 General Motors Corporation Control of engine fuel injection during transitional periods associated with deceleration fuel cut-off

    Also Published As

    Publication number Publication date
    DE69508504D1 (en) 1999-04-29
    EP0701049A1 (en) 1996-03-13
    FR2724203A1 (en) 1996-03-08
    DE69508504T2 (en) 1999-10-28
    FR2724203B1 (en) 1997-02-07

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