EP1002190A1 - Method for correcting an internal combustion engine torque jerks - Google Patents

Method for correcting an internal combustion engine torque jerks

Info

Publication number
EP1002190A1
EP1002190A1 EP98941507A EP98941507A EP1002190A1 EP 1002190 A1 EP1002190 A1 EP 1002190A1 EP 98941507 A EP98941507 A EP 98941507A EP 98941507 A EP98941507 A EP 98941507A EP 1002190 A1 EP1002190 A1 EP 1002190A1
Authority
EP
European Patent Office
Prior art keywords
engine
αpap
control parameter
torque
correcting
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Withdrawn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
EP98941507A
Other languages
German (de)
French (fr)
Inventor
Pierre Constancis
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.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1002190A1 publication Critical patent/EP1002190A1/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Withdrawn legal-status Critical Current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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413—Controller structures or design
    • F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass filter
    • 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
    • F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals

Definitions

  • the present invention relates to a method for correcting the control parameters of an internal combustion engine fitted to a motor vehicle in order to eliminate the possible phenomena of jolts of torque which may occur during particular operating conditions of the vehicle.
  • the engine control parameters namely the injection time or the ignition advance are corrected to eliminate the oscillations by monitoring the engine torque at the wheels and correcting in the loop the value of the control parameter or parameters chosen as a function of the amplitude of the oscillations detected.
  • the known methods are limited to correcting the consequences of an abrupt variation in torque after having identified and identified its occurrence without acting on its cause which is the abrupt variation in the air flow.
  • the object of the present invention is therefore to propose a method for correcting the control parameters of an internal combustion engine, in order to eliminate torque surges, which overcomes the disadvantages of the prior art by being particularly simple to implement.
  • the method according to the invention for correcting torque surges relates more particularly to an internal combustion engine comprising an electronic engine control system determining according to the engine operating conditions the values of the engine control parameters.
  • This method is of the type by which at least one control parameter ( ⁇ PAP) is corrected in response to the oscillations of the motor torque.
  • the method for correcting torque jolts is characterized in that it comprises the following steps: calculation of the value of said control parameter directly as a function of the position of the accelerator pedal; determination of the correction to be applied to this control parameter by filtering the rotation speed of the motor shaft.
  • the process which is the subject of the present invention directly attacks the main source of the torque surges that are the sudden variations of the accelerator pedal which conventionally generate corresponding sudden variations in the air flow or the flow of fuel and therefore sudden variations in torque.
  • the control parameter corrected in response to the oscillations of the engine torque is the opening position of the throttle valve.
  • the calculation of the value of said control parameter as a function of the position of the accelerator pedal is obtained from a law of progressivity adapted.
  • the law of progressivity depends on the values of the characteristic parameters of engine operation and / or on the speed of depressing the accelerator pedal.
  • the filtering of the engine speed operated is carried out by a filter of the filtered second derivative type, of variable gain and time constant.
  • Figure 1 is a structural diagram in partial section of the engine and its engine control device incorporating the method of the present invention
  • FIG. 2 is a block diagram detailing the different stages of the method which is the subject of the invention.
  • FIG. 1 specifies the configuration of an engine control system implementing the torque surge correction method according to the present invention. Only the constituent parts necessary for understanding the invention have been shown.
  • the internal combustion engine of the four-stroke type, with spark ignition and with in-line cylinders, referenced 1, is equipped with a multipoint injection device by which each cylinder is supplied with fuel by a specific electro-injector 5.
  • the opening of each electro-injector 5 is controlled by an electronic engine control system 7, which determines the quantity of fuel injected or the duration of injection Ti in a pressure-time type injection system, as well as the phasing injection in the cycle according to the engine operating conditions.
  • the combustion air supply is controlled by a throttle valve 8.
  • This motorized throttle valve is controlled by the electronic engine control system 7 from the position of the accelerator pedal 9 transmitted by an appropriate displacement sensor.
  • the engine control system transforms the depressing angle of the accelerator pedal ⁇ PED into an angle ⁇ PAP opening the throttle valve according to an adapted table.
  • This correspondence table between the depressing angle of the accelerator pedal ⁇ PED and the opening angle ⁇ PAP of the throttle valve can be more or less complex and take account in particular of the engine operating point (speed pressure mapping , etc.).
  • this table introduces a progressive law adapted between the depressing of the accelerator pedal and the opening of the throttle valve, progressive law which has the effect of limiting too abrupt variations in engine load and therefore eliminate at the source a certain number of disturbances causing torque jolts.
  • the engine control system 7 also controls the instant of ignition of each spark plug 6 by means of the ignition power module 4 which controls the operation of the coil, the high voltage then being sent to each spark plug 6 by l through an un figured distributor.
  • the ignition of a spark plug is ordered before the piston reaches Top Dead center explosion.
  • This advance Av which can vary from a few degrees to several tens of degrees crankshaft, is determined by the engine control system according to the engine operating conditions.
  • the engine control system 7 conventionally comprises a computer comprising a CPU, a random access memory (RAM), a read only memory (ROM), analog-digital converters (A / D), and various input and output interfaces.
  • This engine control system receives input signals, performs operations and generates output signals intended in particular for the injectors 5 and the ignition power module 4.
  • the sensor 3 makes it possible to deliver a signal representative of the running of the teeth carried by the crown and more particularly of the running speed of these teeth, that is to say representative of the instantaneous speed of rotation of the flywheel also called instantaneous speed of rotation of the engine and designated by the symbol N.
  • the value of the speed of rotation N is used to determine the calculation of the injection time and the ignition time according to predetermined strategies.
  • FIG. 2 describes a schematic diagram of the method for correcting torque surges which completes the law of progressivity introduced between ⁇ PED and ⁇ PAP.
  • the motor control parameter ⁇ PAP is corrected by filtering the engine speed N.
  • the regulation loop thus defined is permanently applied to the value ⁇ PAP, which makes it possible to eliminate the oscillations engine torque.
  • This regulation loop is obtained simply by means of a digital filtering, for example of the type carrying out a filtered second derivative of a continuous transfer function given by the formula s 2 / ( ⁇ 2 + 2 ⁇ + s 2 ) where s is the Laplace variable, ⁇ the pulsation and ⁇ its damping.
  • the characteristic values of the filter are for example obtained experimentally for a given engine by measurement on the test bench. These values are stored in the corresponding memories of the engine control system 7 in the conventional form of tables or maps.
  • the value of the angle of opening of the throttle valve ⁇ PAP actually controlled by the electronic engine control system 7 is therefore the value ⁇ PAP obtained from the value ⁇ PED according to the chosen law of progressivity to which is therefore added the value of algebraic correction obtained according to the filtering exposed above.
  • the action on the ⁇ PAP control parameter has the advantage compared to an action on another control parameter such as the injection time or the ignition advance, of not degrading the operation of the engine and in particular its consumption and its pollutant emissions.
  • another control parameter such as the injection time or the ignition advance
  • such an action on ⁇ PAP has a very rapid response time, since in particular through the law of progressivity implemented it is possible to remove the very source of certain misfires.
  • filtering described above can be replaced by any other suitable filtering and, for example by two successive filterings applied to the measurement of the instantaneous rotation speed N of the engine of the type described in the patent application filed by Applicant No. Fr.93 / 14293.
  • the system for correcting torque surges by correcting the opening angle of the ⁇ PAP throttle valve can be produced in various forms:

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

The invention concerns a method for correcting a fuel injection internal combustion engine (1) torque jerks comprising an electronic engine control system (7) determining according to the engine operating conditions, the engine control parameter values (αPAP,Av,Ti), whereby at least one control parameter (αPAP) is corrected in response to the engine torque oscillations. The invention is characterised in that it comprises the following steps: computing said control parameter value (αPAP) on the basis of the accelerator pedal (αPED) position; determining the correction (CorrαPAP) to be applied to said control parameter (αPAP) by filtering the engine shaft rotation speed (N).

Description

PROCEDE DE CORRECTION DES A-COUPS DE COUPLE D'UN MOTEUR A COMBUSTION INTERNE METHOD FOR CORRECTING THE TORQUE IMPACT OF AN INTERNAL COMBUSTION ENGINE
La présente invention concerne un procédé de correction des paramètres de commande 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 present invention relates to a method for correcting the control parameters of an internal combustion engine fitted to a motor vehicle in order to eliminate the possible phenomena of jolts of torque which may occur during particular operating conditions of the vehicle.
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.), apparaissent des phénomènes d'oscillations du couple transmis aux roues du véhicule encore appelés à-coups, ces à-coups affectant alors le confort des passagers du véhicule.It is known that under certain operating conditions of a motor vehicle equipped with an internal combustion engine, in particular in transient regimes (sharp accelerations, etc.), phenomena of oscillations of the torque transmitted to the wheels of the vehicle, also called appear. jolts, these jolts then affecting the comfort of the passengers in the vehicle.
Ces oscillations ont pour principale origine la chaîne cinématique reliant 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 boîte de vitesses et un différentiel, chacun de ces éléments possédant 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 1 ' importance va dépendre des caractéristiques du système de transmission. Pour remédier à ces oscillations de couple, de nombreuses solutions ont été imaginées. Il est ainsi connu dans l'art antérieur, notamment par les documents EP-A-461504 et O-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.The main origin of these oscillations is the kinematic chain connecting the engine to the tire / ground interface. In fact, the mechanical energy at the end of the crankshaft is transmitted to the wheels by a transmission system traditionally comprising a clutch, a gearbox and a differential, each of these elements having its own damping and rigidity. It therefore follows that any sudden variation in the engine torque at the crankshaft is passed on to the wheels with oscillations, the importance of which will depend on the characteristics of the transmission system. To remedy these torque oscillations, numerous solutions have been devised. It is thus known in the prior art, in particular from documents EP-A-461504 and OA-90/06441, to regulate the torque of a motor, so as to reduce or eliminate the perception of torque oscillations, by the driver of the vehicle.
Selon, cet art antérieur connu, les paramètres de commande des moteurs, à savoir le temps d'injection ou l'avance à l'allumage sont corrigés 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 commande choisis en fonction de l'amplitude des oscillations détectées.According to this known prior art, the engine control parameters, namely the injection time or the ignition advance are corrected to eliminate the oscillations by monitoring the engine torque at the wheels and correcting in the loop the value of the control parameter or parameters chosen as a function of the amplitude of the oscillations detected.
De telles méthodes présentent toutefois certains inconvénients, et en particulier celui de provoquer une augmentation des émissions de polluants, puisque les corrections apportées ont principalement pour objet de réduire le couple du moteur en dégradant la combustion.However, such methods have certain drawbacks, and in particular that of causing an increase in pollutant emissions, since the corrections made are mainly intended to reduce the engine torque by degrading combustion.
Par ailleurs, les méthodes connues se limitent à corriger les conséquences d'une brusque variation de couple après avoir repéré et identifié sa survenue sans agir sur sa cause qui est la brusque variation du débit d'air.Furthermore, the known methods are limited to correcting the consequences of an abrupt variation in torque after having identified and identified its occurrence without acting on its cause which is the abrupt variation in the air flow.
Le but de la présente invention est donc de proposer un procédé de correction des paramètres de commande d'un moteur à combustion interne, pour éliminer les à-coups de couple, qui pallie les inconvénients de l'art antérieur en étant particulièrement simple à mettre en oeuvre.The object of the present invention is therefore to propose a method for correcting the control parameters of an internal combustion engine, in order to eliminate torque surges, which overcomes the disadvantages of the prior art by being particularly simple to implement.
Le procédé selon l'invention de correction des à-coups de couple concerne plus particulièrement un moteur à combustion interne comportant un système électronique de contrôle moteur déterminant suivant les conditions de fonctionnement du moteur les valeurs des paramètres de commande du moteur. Ce procédé est du type par lequel au moins un paramètre de commande (αPAP) est corrigé en réponse aux oscillations du couple moteur.The method according to the invention for correcting torque surges relates more particularly to an internal combustion engine comprising an electronic engine control system determining according to the engine operating conditions the values of the engine control parameters. This method is of the type by which at least one control parameter (αPAP) is corrected in response to the oscillations of the motor torque.
Selon l'invention, le procédé de correction des à-coups de couple est caractérisé en ce qu'il comprend les étapes suivantes : calcul de la valeur dudit paramètre de commande directement en fonction de la position de la pédale d'accélérateur ; détermination de la correction à appliquer à ce paramètre de commande par filtrage du régime de rotation de l'arbre moteur.According to the invention, the method for correcting torque jolts is characterized in that it comprises the following steps: calculation of the value of said control parameter directly as a function of the position of the accelerator pedal; determination of the correction to be applied to this control parameter by filtering the rotation speed of the motor shaft.
Ainsi, le procédé objet de la présente invention s'attaque directement à la source principale des à-coups de couple que sont les variations brutales de la pédale d'accélérateur qui engendrent classiquement des variations brutales correspondantes du débit d'air ou du débit de carburant et donc des variations brutales de couple. En éliminant les perturbations à la source et en prenant en compte l'évolution du régime moteur, on compense mieux les à-coups de couple. Selon une autre caractéristique du procédé de correction des à-coups de couple objet de l'invention, le paramètre de commande corrigé en réponse aux oscillations du couple moteur est la position d'ouverture du papillon des gaz.Thus, the process which is the subject of the present invention directly attacks the main source of the torque surges that are the sudden variations of the accelerator pedal which conventionally generate corresponding sudden variations in the air flow or the flow of fuel and therefore sudden variations in torque. By eliminating disturbances at the source and taking into account the evolution of the engine speed, we better compensate for the torque surges. According to another characteristic of the method for correcting torque jolts which is the subject of the invention, the control parameter corrected in response to the oscillations of the engine torque is the opening position of the throttle valve.
Selon une autre caractéristique du procédé de correction des à-coups de couple objet de l'invention, le calcul de la valeur dudit paramètre de commande en fonction de la position de la pédale d'accélérateur est obtenu à partir d'une loi de progressivité adaptée.According to another characteristic of the method for correcting torque jolts which is the subject of the invention, the calculation of the value of said control parameter as a function of the position of the accelerator pedal is obtained from a law of progressivity adapted.
Selon une autre caractéristique du procédé de correction des à-coups de couple objet de l'invention, la loi de progressivité dépend des valeurs des paramètres caractéristiques de fonctionnement du moteur et/ou de la vitesse d'enfoncement de la pédale d'accélérateur.According to another characteristic of the method for correcting torque jerks which is the subject of the invention, the law of progressivity depends on the values of the characteristic parameters of engine operation and / or on the speed of depressing the accelerator pedal.
Selon une autre caractéristique du procédé de correction des à-coups de couple objet de l'invention, le filtrage du régime moteur opéré est réalisé par un filtre du type dérivée seconde filtrée, de gain et de constante de temps variables.According to another characteristic of the method for correcting torque jerks which is the subject of the invention, the filtering of the engine speed operated is carried out by a filter of the filtered second derivative type, of variable gain and time constant.
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, ce mode de réalisation étant donné à titre d'exemple non limitatif, en se référant au dessin annexé, dans lequel : la figure 1 est un schéma structurel en coupe partielle du moteur et de son dispositif de contrôle moteur intégrant le procédé objet de la présente 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, this embodiment being given to by way of nonlimiting example, with reference to the appended drawing, in which: Figure 1 is a structural diagram in partial section of the engine and its engine control device incorporating the method of the present invention;
la figure 2 est un bloc diagramme détaillant les différentes étapes du procédé objet de l'invention.FIG. 2 is a block diagram detailing the different stages of the method which is the subject of the invention.
La figure 1 précise la configuration d'un système de contrôle moteur mettant en oeuvre le procédé de correction des à-coups de couple selon la présente invention. Seules les parties constitutives nécessaires à la compréhension de l'invention ont été figurées.FIG. 1 specifies the configuration of an engine control system implementing the torque surge correction method according to the present invention. Only the constituent parts necessary for understanding the invention have been shown.
Le moteur à combustion interne du type quatre temps, à allumage commandé et à cylindres en ligne, référencé 1, est équipé d'un dispositif d'injection multipoint par lequel chaque cylindre est alimenté en carburant par un électro-injecteur 5 spécifique. L'ouverture de chaque électro- injecteur 5 est commandé par un système électronique de contrôle moteur 7, qui détermine la quantité de carburant injectée ou la durée d'injection Ti dans un système d'injection du type pression-temps, ainsi que le phasage de l'injection dans le cycle suivant les conditions de fonctionnement du moteur.The internal combustion engine of the four-stroke type, with spark ignition and with in-line cylinders, referenced 1, is equipped with a multipoint injection device by which each cylinder is supplied with fuel by a specific electro-injector 5. The opening of each electro-injector 5 is controlled by an electronic engine control system 7, which determines the quantity of fuel injected or the duration of injection Ti in a pressure-time type injection system, as well as the phasing injection in the cycle according to the engine operating conditions.
L'alimentation en air comburant est commandée par un papillon des gaz 8. Ce papillon des gaz du type motorisé, est piloté par le système électronique de contrôle moteur 7 à partir de la position de la pédale d'accélérateur 9 transmise par un capteur de déplacement approprié. Ainsi, le système de contrôle moteur transforme selon une table adaptée, l'angle d'enfoncement de la pédale d'accélérateur αPED en un angle αPAP d'ouverture du papillon des gaz.The combustion air supply is controlled by a throttle valve 8. This motorized throttle valve is controlled by the electronic engine control system 7 from the position of the accelerator pedal 9 transmitted by an appropriate displacement sensor. Thus, the engine control system transforms the depressing angle of the accelerator pedal αPED into an angle αPAP opening the throttle valve according to an adapted table.
Cette table de correspondance entre l'angle d'enfoncement de la pédale d'accélérateur αPED et l'angle αPAP d'ouverture du papillon des gaz, peut être plus ou moins complexe et tenir compte notamment du point de fonctionnement moteur (cartographie pression régime, etc.).This correspondence table between the depressing angle of the accelerator pedal αPED and the opening angle αPAP of the throttle valve, can be more or less complex and take account in particular of the engine operating point (speed pressure mapping , etc.).
Selon l'invention cette table introduit une loi de progressivité adaptée entre l'enfoncement de la pédale d'accélérateur et l'ouverture du papillon des gaz, loi de progressivité qui a pour effet de limiter les trop brusques variations de charge du moteur et donc supprimer à la source un certain nombre de perturbations à l'origine d' à-coups de couple. Cette loi de progressivité peut par exemple prendre en compte la vitesse d'enfoncement αPED ' de la pédale d'accélérateur 9 (αPED' = dαPED/dt) .According to the invention, this table introduces a progressive law adapted between the depressing of the accelerator pedal and the opening of the throttle valve, progressive law which has the effect of limiting too abrupt variations in engine load and therefore eliminate at the source a certain number of disturbances causing torque jolts. This progressive law can for example take into account the depressing speed αPED 'of the accelerator pedal 9 (αPED' = dαPED / dt).
Le système de contrôle moteur 7 commande également l'instant d'allumage de chaque bougie 6 par l'intermédiaire du module de puissance d'allumage 4 qui contrôle le fonctionnement de la bobine, la haute tension étant ensuite envoyée à chaque bougie 6 par l'intermédiaire d'un distributeur non figuré. Classiquement l'allumage d'une bougie est commandé avant que le piston arrive au Point Mort Haut explosion. Cette avance Av, qui peut évoluer de quelques degrés à plusieurs dizaines de degrés vilebrequin, est déterminée par le système de contrôle moteur suivant les conditions de fonctionnement du moteur.The engine control system 7 also controls the instant of ignition of each spark plug 6 by means of the ignition power module 4 which controls the operation of the coil, the high voltage then being sent to each spark plug 6 by l through an un figured distributor. Conventionally, the ignition of a spark plug is ordered before the piston reaches Top Dead center explosion. This advance Av, which can vary from a few degrees to several tens of degrees crankshaft, is determined by the engine control system according to the engine operating conditions.
Le système de contrôle moteur 7 comprend classiquement un calculateur comportant une CPU, une mémoire vive (RAM) , une mémoire morte (ROM) , des convertisseurs analogiques-numériques (A/D) , et différentes interfaces d'entrées et de sorties. Ce système de contrôle moteur reçoit des signaux d'entrée, effectue des opérations et génère des signaux de sortie à destination notamment des injecteurs 5 et du module de puissance d'allumage 4.The engine control system 7 conventionally comprises a computer comprising a CPU, a random access memory (RAM), a read only memory (ROM), analog-digital converters (A / D), and various input and output interfaces. This engine control system receives input signals, performs operations and generates output signals intended in particular for the injectors 5 and the ignition power module 4.
Parmi les signaux d'entrée du système de contrôle moteur 7, figurent donc l'angle d'enfoncement de la pédale d'accélérateur αPED et ceux émis par un capteur vilebrequin 3 pour permettre notamment de synchroniser les instants d'injection et d'allumage avec le fonctionnement du moteur.Among the input signals of the engine control system 7, therefore, appear the depressing angle of the accelerator pedal αPED and those emitted by a crankshaft sensor 3 to allow in particular to synchronize the instants of injection and ignition with the engine running.
Ce capteur 3 , du type par exemple à réluctance variable, qui est monté fixe sur le bâti du moteur, est associé à une couronne de mesure 2, solidaire du volant d'inertie et comporte un certain nombre de repères ou dents. Le capteur 3 permet de délivrer un signal représentatif du défilement des dents portées par la couronne et plus particulièrement de la vitesse de défilement de ces dents, c'est-à-dire représentative de la vitesse instantanée de rotation du volant encore appelée régime instantané de rotation du moteur et désigné par le symbole N. La valeur du régime de rotation N est utilisée pour déterminer le calcul du temps d'injection et l'instant d'allumage selon des stratégies prédéterminées.This sensor 3, of the variable reluctance type for example, which is fixedly mounted on the motor frame, is associated with a measuring ring 2, integral with the flywheel and has a certain number of pins or teeth. The sensor 3 makes it possible to deliver a signal representative of the running of the teeth carried by the crown and more particularly of the running speed of these teeth, that is to say representative of the instantaneous speed of rotation of the flywheel also called instantaneous speed of rotation of the engine and designated by the symbol N. The value of the speed of rotation N is used to determine the calculation of the injection time and the ignition time according to predetermined strategies.
La figure 2, décrit un schéma de principe du procédé de correction des à-coups de couple venant compléter la loi de progressivité introduite entre αPED et αPAP.FIG. 2 describes a schematic diagram of the method for correcting torque surges which completes the law of progressivity introduced between αPED and αPAP.
Selon ce procédé de correction des à-coups de couple le paramètre de commande du moteur αPAP est corrigé par filtrage du régime moteur N. La boucle de régulation ainsi définie est appliquée en permanence sur la valeur αPAP, ce qui permet d'éliminer les oscillations du couple moteur.According to this process of correction of the torque surges the motor control parameter αPAP is corrected by filtering the engine speed N. The regulation loop thus defined is permanently applied to the value αPAP, which makes it possible to eliminate the oscillations engine torque.
Cette boucle de régulation est obtenue simplement grâce à un filtrage numérique par exemple du type réalisant une dérivée seconde filtrée de fonction de transfert continue donnée par la formule s2/(ω2+ 2ωξ + s2) ou s est la variable de Laplace, ω la pulsation et ξ son amortissement .This regulation loop is obtained simply by means of a digital filtering, for example of the type carrying out a filtered second derivative of a continuous transfer function given by the formula s 2 / (ω 2 + 2ωξ + s 2 ) where s is the Laplace variable, ω the pulsation and ξ its damping.
Les valeurs caractéristiques du filtre sont par exemple obtenues expérimentalement pour un moteur donné par mesure au banc d'essai. Ces valeurs sont stockées dans les mémoires correspondantes du système de contrôle moteur 7 sous la forme classique de tables ou de cartographies .The characteristic values of the filter are for example obtained experimentally for a given engine by measurement on the test bench. These values are stored in the corresponding memories of the engine control system 7 in the conventional form of tables or maps.
La valeur de l'angle αPAP d'ouverture du papillon des gaz réellement commandée par le système électronique de contrôle moteur 7 est donc la valeur αPAP obtenue à partir de la valeur αPED selon la loi de progressivité choisie à laquelle vient donc s'ajouter la valeur de correction algébrique obtenue selon le filtrage exposé ci- dessus .The value of the angle of opening of the throttle valve αPAP actually controlled by the electronic engine control system 7 is therefore the value αPAP obtained from the value αPED according to the chosen law of progressivity to which is therefore added the value of algebraic correction obtained according to the filtering exposed above.
Ainsi conformément au procédé selon l'invention, il est possible de réguler la valeur du couple moteur en adaptant en permanence la valeur de l'angle αPAP, ce qui permet d'éliminer les éventuelles oscillations de couple quelle que soit la plage de fonctionnement du moteur. Le procédé permet donc de supprimer toute perception d' à-coups de couple au(x) passager (s) sans toutefois diminuer les performances du véhicule.Thus, in accordance with the method according to the invention, it is possible to regulate the value of the motor torque by continuously adapting the value of the angle αPAP, which makes it possible to eliminate any torque oscillations whatever the operating range of the engine. The method therefore makes it possible to eliminate any perception of torque jolts to the passenger (s) without, however, reducing the performance of the vehicle.
L'action sur le paramètre de commande αPAP présente l'avantage par rapport à une action sur un autre paramètre de commande comme le temps d'injection ou l'avance à l'allumage, de ne pas dégrader le fonctionnement du moteur et notamment sa consommation et ses émissions de polluants. De plus une telle action sur αPAP présente un temps de réponse très rapide, puisque notamment à travers la loi de progressivité mise en place il est possible de supprimer la source même de certains ratés de combustion.The action on the αPAP control parameter has the advantage compared to an action on another control parameter such as the injection time or the ignition advance, of not degrading the operation of the engine and in particular its consumption and its pollutant emissions. In addition, such an action on αPAP has a very rapid response time, since in particular through the law of progressivity implemented it is possible to remove the very source of certain misfires.
La grande simplicité du procédé développé permet son implantation même sur des calculateurs de capacité limitée. De plus, le faible nombre de valeurs à calibrer permet de réduire le temps de mise au point d'un véhicule au minimum. 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.The great simplicity of the developed process allows its implementation even on computers of limited capacity. In addition, the small number of values to be calibrated makes it possible to reduce the time required to debug a vehicle to a minimum. Of course, the invention is in no way limited to the embodiment described and illustrated, which has been given only by way of example.
Au contraire, l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont effectuées suivant son esprit.On the contrary, the invention includes all the technical equivalents of the means described as well as their combinations if these are carried out according to the spirit.
Ainsi le filtrage décrit ci-dessus peut être remplacé par n'importe quel autre filtrage approprié et, par exemple par deux filtrages successifs appliqués à la mesure du régime de rotation instantané N du moteur du type de celui décrit dans la demande de brevet déposée par la Demanderesse n°Fr.93/14293.Thus the filtering described above can be replaced by any other suitable filtering and, for example by two successive filterings applied to the measurement of the instantaneous rotation speed N of the engine of the type described in the patent application filed by Applicant No. Fr.93 / 14293.
Ainsi, le système de correction des à-coups de couple par correction de l'angle d'ouverture du papillon des gaz αPAP, peut être réalisée sous diverses formes :Thus, the system for correcting torque surges by correcting the opening angle of the αPAP throttle valve can be produced in various forms:
- soit avec des composants d'électronique analogique pour lesquels les différentiateurs, multiplicateurs 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. - either with analog electronic components for which the differentiators, multipliers 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 chip (custom) whose hardware and software resources have been optimized to carry out the functions which are the subject of the invention: microprogrammable chip or not, separately encapsulated or all or part of a coprocessor installed in a microcontroller or microprocessor etc.

Claims

REVENDICATIONS
[1] Procédé de correction des à-coups de couple d'un moteur à combustion interne (1) du type comportant un système électronique de contrôle moteur (7) déterminant suivant les conditions de fonctionnement du moteur, les valeurs des paramètres de commande (αPAP,Av,Ti) du moteur, par lequel au moins un paramètre de commande (αPAP) est corrigé en réponse aux oscillations du couple moteur, caractérisé en ce qu'il comprend les étapes suivantes : calcul de la valeur dudit paramètre de commande (αPAP) directement en fonction de la position de la pédale d'accélérateur (αPED) ; détermination de la correction (CorrαPAP) à appliquer audit paramètre de commande (αPAP) par filtrage du régime de rotation (N) de •l'arbre moteur.[1] Method for correcting torque jerks of an internal combustion engine (1) of the type comprising an electronic engine control system (7) determining, depending on the operating conditions of the engine, the values of the control parameters ( αPAP,Av,Ti) of the motor, by which at least one control parameter (αPAP) is corrected in response to oscillations of the motor torque, characterized in that it comprises the following steps: calculation of the value of said control parameter ( αPAP) directly depending on the position of the accelerator pedal (αPED); determination of the correction (CorrαPAP) to apply to said control parameter (αPAP) by filtering the rotation speed (N) of the motor shaft.
[2] Procédé de correction des à-coups de couple selon la revendication 1, caractérisé en ce que ledit paramètre de commande corrigé en réponse aux oscillations du couple moteur est la position d'ouverture (αPAP) du papillon des gaz.[2] Method for correcting torque jerks according to claim 1, characterized in that said control parameter corrected in response to oscillations of the engine torque is the opening position (αPAP) of the throttle valve.
[3] Procédé de correction des à-coups de couple selon l'une quelconque des revendications 1 à 2, caractérisé en ce que le calcul de -la \>valeur dudit paramètre de commande (αPAP) en fonct-ion de la position de la pédale d'accélérateur (αPED) est obtenu à partir d'une loi de progressivité adaptée.[3] Method for correcting torque jerks according to any one of claims 1 to 2, characterized in that the calculation of -the \ >value of said control parameter (αPAP) as a function of the position of the accelerator pedal (αPED) is obtained from an adapted progressiveness law.
[4] Procédé de correction des à-coups de couple selon la revendication 3 , caractérisé en ce que ladite loi de progressivité est une fonction dépendant des valeurs des paramètres caractéristiques de fonctionnement du moteur et/ou de la vitesse d'enfoncement de la pédale d'accélérateur (αPED').[4] Method for correcting torque jerks according to claim 3, characterized in that said law of progressiveness is a function depending on the values of the characteristic operating parameters of the engine and/or the speed of depression of the accelerator pedal (αPED').
[5] Procédé de correction des à-coups de couple selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le filtrage du régime moteur opéré est réalisé par un filtre du type dérivée seconde filtrée, de gain et de constante de temps variables. [5] Method for correcting torque jerks according to any one of claims 1 to 4, characterized in that the filtering of the engine speed operated is carried out by a filter of the filtered second derivative type, gain and constant of variable times.
EP98941507A 1997-08-01 1998-07-31 Method for correcting an internal combustion engine torque jerks Withdrawn EP1002190A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9709856 1997-08-01
FR9709856A FR2766872B1 (en) 1997-08-01 1997-08-01 METHOD FOR CORRECTING THE TORQUE IMPACT OF AN INTERNAL COMBUSTION ENGINE
PCT/FR1998/001706 WO1999006685A1 (en) 1997-08-01 1998-07-31 Method for correcting an internal combustion engine torque jerks

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FR2766872A1 (en) 1999-02-05

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