EP1731745A1 - Control system for operating a Diesel engine of an automotive vehicle - Google Patents

Control system for operating a Diesel engine of an automotive vehicle Download PDF

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Publication number
EP1731745A1
EP1731745A1 EP06290916A EP06290916A EP1731745A1 EP 1731745 A1 EP1731745 A1 EP 1731745A1 EP 06290916 A EP06290916 A EP 06290916A EP 06290916 A EP06290916 A EP 06290916A EP 1731745 A1 EP1731745 A1 EP 1731745A1
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EP
European Patent Office
Prior art keywords
cylinder
supply
piston
motor shaft
displacement
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.)
Granted
Application number
EP06290916A
Other languages
German (de)
French (fr)
Other versions
EP1731745B1 (en
Inventor
Claire Vermonet
Vincent Souchon
Benjamin Desmarquet
Guillaume Meissonnier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Delphi International Operations Luxembourg SARL
Original Assignee
Peugeot Citroen Automobiles SA
Delphi Technologies Inc
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Application filed by Peugeot Citroen Automobiles SA, Delphi Technologies Inc filed Critical Peugeot Citroen Automobiles SA
Publication of EP1731745A1 publication Critical patent/EP1731745A1/en
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Publication of EP1731745B1 publication Critical patent/EP1731745B1/en
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Classifications

    • 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
    • F02D41/008—Controlling each cylinder individually
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • 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
    • F02D2041/1418—Several control loops, either as alternatives or simultaneous

Definitions

  • the present invention relates to a system for controlling the operation of a motor vehicle diesel engine comprising means for supplying the cylinders with fuel.
  • the present invention relates to a system comprising means for acquiring the pressure of a reference cylinder and means for controlling the supply means as a function of the pressure acquired and a predetermined setpoint for supplying power. fuel for each cylinder.
  • this type of system requires the implantation of many additional sensors, including a pressure sensor for each cylinder of the engine, and / or the use of a microprocessor of high computing capacity to calculate all the data necessary for the adjustment. of the engine injection.
  • the present invention aims to solve the aforementioned problems by providing a system for controlling the operation of a motor vehicle diesel engine requiring a reduced number of sensors and a reduced computing capacity.
  • FIG. 1 there is illustrated generally a diesel engine for a motor vehicle equipped for example with four cylinders 12a, 12b, 12c, 12d.
  • Each cylinder 12a, 12b, 12c, 12d of the engine 10 comprises an injector 14a, 14b, 14c, 14d, a cylinder head 18a, 18b, 18c, 18d, a piston 20a, 20b, 20c, 20d and a combustion chamber 22a, 22b , 22c, 22d delimited by the piston and cylinder head.
  • the injector of the cylinder included in the cylinder head thereof, is connected to a common supply rail 24 of the engine and is adapted to supply the combustion chamber 22a, 22b, 22c, 22d of the fuel cylinder according to a strategy predetermined injection according to for example at least one pilot injection and a main injection of fuel, as known in the state of the art.
  • a cylinder for example the cylinder 12a designated in the rest of the description as a "reference" cylinder, is also associated with a chain 26 for acquiring pressure in the cylinder.
  • This acquisition chain 26 comprises for example a piezoelectric element deformation sensor 28 inserted into the cylinder head 18a of the reference cylinder 12a or integrated with the glow plug (not shown) thereof, and suitable for measuring deformation of the yoke 18a under the effect of pressure variations in the combustion chamber 22a of the cylinder 12a.
  • the pistons 20a, 20b, 20c, 20d are connected to a motor shaft 30 of the motor 10.
  • the motor shaft 30 is associated with a chain 32 for acquiring the rotational speed of the motor, comprising, for example, an associated Hall effect sensor. to a toothed wheel fixed on the motor shaft.
  • a motor angle acquisition chain is also associated with the motor shaft 30.
  • This chain is for example merged with the speed acquisition chain 32, this chain being designed for the acquisition of these two magnitudes, as this is known per se in the state of the art.
  • a chain 34 for acquiring the pressure in the common feed ramp 24 is moreover arranged in the common feed ramp 24 for measuring the pressure therein, as is known per se in the state of the technique.
  • An acquisition chain 36 of the engine torque desired by the driver is also provided and comprises, for example, a sensor of the position of the accelerator pedal of the vehicle, as is known per se in the state of the art.
  • the chains 26, 32, 34, 36 for acquiring pressure in the reference cylinder 12a, the engine speed, the angle of the drive shaft, the pressure in the common feed ramp and the desired engine torque are connected to a control and information processing unit 38.
  • the unit 38 is adapted to control the operation of the engine according to the measurements delivered by them and in particular to correct the drifts of the fuel injection into the cylinders.
  • the control unit 38 is connected to the injectors 14a, 14b, 14c, 14d of the cylinders and to the common feed ramp 24 and is adapted to control various operating parameters thereof, such as, for example, the flow of fuel injected into the cylinders 12a, 12b, 12c, 12d by the injectors 14a, 14b, 14c, 14d.
  • FIG. 2 is a schematic view of the control unit 38.
  • the unit 38 comprises first mapping means 50 connected to receive the R regime and the pair C acquired and able to evaluate, for these two values, a predetermined map of flow instructions as a function of torque values of engine speed and motor torque, as is known per se in the state of the art.
  • the first means 50 output a flow instruction Da, Db, Dc, Dd for each cylinder 12a, 12b, 12c, 12d of the engine 10.
  • the unit 38 also comprises servo-control means 52 adapted to control the fuel flow in the reference cylinder 12a on its corresponding flow setpoint Da as a function of the pressure Pa acquired therefrom.
  • These servocontrol means 52 comprise a module 54 for estimating the flow rate injected into the reference cylinder 12a as a function of the pressure Pa acquired and the angle of the driving shaft ⁇ acquired over a predetermined angular range.
  • the module 54 is connected to a subtractor 56 also connected to the first mapping means 50.
  • This subtracter 56 forms the difference between the flow setpoint Da delivered by the means 50 and the estimated flow Da by the means 52 and delivers this difference to second means 58 forming correction mapping.
  • the second means 58 memorize this difference and determine a value ⁇ Da of resetting the flow setpoint Da of the reference cylinder 12a calculated by the first mapping means 50.
  • An adder 60 is connected to the first and second mapping means 58, 60 and adds the flow setpoint Da to the reset value ⁇ Da thereof to form a corrected flow setpoint Dacorr for the reference cylinder 12a.
  • This corrected flow setpoint Dacorr is delivered to control means 62 for controlling the injectors 14a, 14b, 14c, 14d according to the flow instructions they receive, as is known per se in the state of the art. .
  • the value ⁇ Da is determined in such a way that the application of the corrected flow setpoint Dacorr, as effective setpoint for the reference cylinder 12a, has the effect that the actual flow rate of fuel injected into it is substantially equal to the flow setpoint Da initially determined by the first mapping means 50.
  • the control unit 38 furthermore comprises means 64 connected to receive the R-speed of the engine and the angle of the motor shaft ⁇ acquired.
  • the means 64 calculate according to these, and for each cylinder 12a, 12b, 12c, 12d of the motor, the rotation speed Va, Vb, Vc, Vd of the motor shaft generated by the displacement of the piston of the cylinder, hereinafter referred to as "rotational speed associated with the cylinder".
  • the means 64 calculate the speed of rotation associated with the cylinder by forming the average engine speed R acquired over a predetermined angular range of the cylinder cycle.
  • this angular range is included in the expansion phase of the cylinder cycle and corresponds, for example, to the angular range separating the top dead center of the cylinder cycle from the top dead center of the cylinder cycle in which the next combustion takes place.
  • the means 64 are connected to means 66 for calculating the velocity differences Vi-Va, where Vi denotes the rotational speed associated with a cylinder other than the reference cylinder 12a, that is to say the rotation speed Vb , Vc and Vd associated with the cylinders 12b, 12c and 12d respectively.
  • These differences in rotation speeds Vi-Va are delivered by the calculation means 66 to means 68 for regulating speed of rotation.
  • These means 68 are capable of determining values ⁇ Db, ⁇ Dc and ⁇ Dd of resetting the flow instructions Db, Dc and Dd, respectively, in order to regulate the rotational speeds associated with the cylinders 12b, 12c and 12d on the speed of rotation associated with the reference cylinder. 12a, as will be explained in more detail later.
  • the values ⁇ Db, ⁇ Dc, ⁇ Dd of adjustment for the flow instructions Db, Dc, Dd are delivered to adders 70, 72 and 74 respectively. These adders 70, 72, 74 are also connected to the first mapping means 50 and sum up the flow instructions Db, Dc, Dd calculated by the means 50 to the values ⁇ Db, ⁇ Dc, ⁇ Dd respectively to generate corrected flow instructions. Dbcorr, Dccorr, Ddcorr for cylinders 12b, 12c, 12d.
  • Each adjustment value ⁇ Db, ⁇ Dc, ⁇ Dd is determined in such a way that the application of the corrected flow setpoint Dbcorr, Dccorr, Ddcorr corresponding as effective setpoint for the cylinder considered has the effect that the rotation speed associated with this cylinder is substantially equal to that associated with the reference cylinder 12a, thereby canceling the corresponding velocity difference Vi-Va.
  • FIG. 3 One embodiment of the speed control means 68 is illustrated schematically in FIG. 3.
  • the means 68 comprise a fast speed control loop and a slow rate control loop.
  • the fast control loop comprises means 80, 82, 84 for regulating the rotation speed cycle to cycle.
  • These means 80, 82, 84 receive as input the differences in rotation speeds Vi-Va and are suitable for calculating at each motor cycle the first values ⁇ Db ', ⁇ Dc', ⁇ Dd 'for resetting the flow rates Db, Dc and Dd respectively.
  • the means 80, 82, 84 use for this purpose a predetermined regulation law rotational speeds associated with the cylinders 12b, 12c and 12d on the rotational speed associated with the reference cylinder 12a for example in the form of a function transfer predetermined between each rotation speed difference Vi-Va and its associated first value ⁇ Db ', ⁇ Dc', ⁇ Dd '.
  • These transfer functions are determined in a previous study. For example, the same transfer function is used to regulate all the rotational speeds.
  • the slow regulation loop which has a slower dynamic than that of the fast loop, comprises means 86, 88, 90 forming a so-called "self-adaptive" speed control chart.
  • the means 86, 88, 90 are connected to means 80, 82, 84 for regulating speed of rotation and are suitable for storing the first values ⁇ Db ', ⁇ Dc', ⁇ Dd 'of the reset delivered by them as a function of their location. in the motor field defined by the motor torque and the speed.
  • the means 86, 88, 90 are also connected to the R and C pair acquisition chains.
  • These means 86, 88, 90 determine, as a function of the first stored values ⁇ Db ', ⁇ Dc', ⁇ Dd 'and the values of the speed R and the torque C received at the input, second values ⁇ Db ", ⁇ Dc", ⁇ Dd " of resetting flows Db, Dc, Dd, by evaluating respective predetermined maps of resetting flow rates.
  • adders 92, 94, 96 are connected to rotation speed regulating means 80, 82, 84 and mapping means 86, 88, 90.
  • adders 80, 82, 84 are able to add the first values ⁇ Db ', ⁇ Dc', ⁇ Dd 'of registration to the second values ⁇ Db ", ⁇ Dc", ⁇ Dd "of registration respectively and to deliver the sums ⁇ Db' + ⁇ Db", ⁇ Dc '+ ⁇ Dc', ⁇ Dd '+ ⁇ Dd' corresponding to adders 70, 72, 74 as values ⁇ Db, ⁇ Dc, ⁇ Dd of resetting flow rates Db, Dc, Dd.

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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)

Abstract

A slave module controls fuel supply of a reference cylinder (12a) as a function of pressure detected by an acquisition chain (26). The drive shaft rotation speeds generated by the displacement of the piston (20a) of reference cylinder and the pistons (20b-20d) of other cylinders (12b-12d), are measured. A controller controls the fuel supply of other cylinders as a function of the measured speeds such that the shaft rotation speed of other cylinders follow the shaft rotation speed of reference cylinder.

Description

La présente invention concerne un système de contrôle du fonctionnement d'un moteur Diesel de véhicule automobile comprenant des moyens d'alimentation en carburant des cylindres de celui-ci.The present invention relates to a system for controlling the operation of a motor vehicle diesel engine comprising means for supplying the cylinders with fuel.

Plus particulièrement, la présente invention concerne un système comprenant des moyens d'acquisition de la pression d'un cylindre de référence et des moyens de pilotage des moyens d'alimentation en fonction de la pression acquise et d'une consigne prédéterminée d'alimentation en carburant pour chaque cylindre.More particularly, the present invention relates to a system comprising means for acquiring the pressure of a reference cylinder and means for controlling the supply means as a function of the pressure acquired and a predetermined setpoint for supplying power. fuel for each cylinder.

On connaît dans l'état de la technique de nombreux systèmes de recalage de l'injection d'un moteur Diesel de véhicule automobile. Ces systèmes ont pour fonction de déterminer, régulièrement et/ou périodiquement lors du cycle de vie du moteur, un nouveau réglage de l'injection de carburant dans les cylindres de celui-ci afin de corriger les diverses dérives de son fonctionnement (comme par exemple le vieillissement de ses cylindres qui induit une modification de leur taux de compression, de la perméabilité de leurs soupapes, etc...).Numerous systems for the registration of the injection of a diesel engine of a motor vehicle are known in the state of the art. These systems have the function of determining, regularly and / or periodically during the engine's life cycle, a new adjustment of the fuel injection in the cylinders thereof in order to correct the various drifts of its operation (as for example the aging of its cylinders which induces a modification of their compression ratio, the permeability of their valves, etc ...).

Cependant ce type de système nécessite l'implantation de nombreux capteurs supplémentaires, notamment un capteur de pression pour chaque cylindre du moteur, et/ou l'utilisation d'un microprocesseur de grande capacité de calcul pour calculer l'ensemble des données nécessaires au réglage de l'injection du moteur.However, this type of system requires the implantation of many additional sensors, including a pressure sensor for each cylinder of the engine, and / or the use of a microprocessor of high computing capacity to calculate all the data necessary for the adjustment. of the engine injection.

La présente invention a pour but de résoudre les problèmes susmentionnés en proposant un système de contrôle du fonctionnement d'un moteur Diesel de véhicule automobile nécessitant un nombre de capteurs ainsi qu'une capacité de calcul réduits.The present invention aims to solve the aforementioned problems by providing a system for controlling the operation of a motor vehicle diesel engine requiring a reduced number of sensors and a reduced computing capacity.

A cet effet, l'invention a pour objet un système de contrôle du fonctionnement d'un moteur Diesel de véhicule automobile comprenant des moyens d'alimentation en carburant des cylindres de celui-ci, le système comprenant des moyens d'acquisition de la pression d'un cylindre de référence et des moyens de pilotage des moyens d'alimentation en fonction de la pression acquise et d'une consigne prédéterminée d'alimentation en carburant pour chaque cylindre, caractérisé en ce que les moyens de pilotage comprennent :

  • des moyens d'asservissement adaptés pour asservir l'alimentation en carburant du cylindre de référence sur sa consigne d'alimentation en fonction de la pression acquise ;
  • des moyens d'acquisition de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre de référence et de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston d'au moins un autre cylindre ; et
  • des moyens de commande adaptés pour commander l'alimentation en carburant de cet au moins un autre cylindre en fonction des vitesses acquises en asservissant la vitesse de rotation de l'arbre moteur générée par le déplacement du piston de cet au moins un autre cylindre sur la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre de référence.
For this purpose, the subject of the invention is a system for controlling the operation of a motor vehicle diesel engine comprising fuel supply means for the cylinders thereof, the system comprising means for acquiring pressure. a reference cylinder and means for controlling the supply means as a function of the pressure acquired and a predetermined fuel supply setpoint for each cylinder, characterized in that the control means comprise:
  • servo-control means adapted to control the fuel supply of the reference cylinder to its supply setpoint as a function of the acquired pressure;
  • means for acquiring the rotational speed of the motor shaft generated by the displacement of the piston of the reference cylinder and the speed of rotation of the motor shaft generated by the displacement of the piston of at least one other cylinder; and
  • control means adapted to control the supply of fuel to this at least one other cylinder as a function of the speeds acquired by controlling the speed of rotation of the motor shaft generated by the movement of the piston of this at least one other cylinder on the speed of rotation of the motor shaft generated by displacement of the piston of the reference cylinder.

Selon d'autres caractéristiques, le système est caractérisé en ce que :

  • les moyens de pilotage sont adaptés pour piloter le débit de carburant injecté dans les cylindres par les moyens d'alimentation en fonction d'une consigne de débit de carburant pour chaque cylindre, et en ce que le système comprend des moyens d'estimation du débit de carburant injecté dans le cylindre de référence en fonction de la pression acquise de celui-ci ;
  • les moyens d'asservissement comprennent des moyens formant cartographie de correction de la consigne de débit du cylindre de référence en fonction de la différence entre la consigne de débit et le débit estimé ;
  • les moyens d'alimentation comprennent des moyens à rampe commune d'alimentation, le système comprend des moyens d'acquisition de la pression des moyens à rampe commune d'alimentation, et les moyens d'asservissement sont propres à asservir l'alimentation du cylindre de référence en fonction de la pression acquise des moyens à rampe commune d'alimentation ;
  • les moyens d'acquisition de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre de référence et de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du au moins un autre cylindre comprennent des moyens d'acquisition du régime de rotation du moteur et des moyens de détermination des vitesses de rotation de l'arbre moteur générées par le déplacement de ces pistons en fonction du régime acquis ;
  • les moyens de commande de l'alimentation du au moins un autre cylindre sont propres à modifier la consigne d'alimentation de celui-ci en fonction de la différence entre la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre de référence et la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du au moins un autre cylindre ;
  • les moyens de commande de l'alimentation du au moins un autre cylindre comprennent des moyens de régulation de vitesse cycle à cycle mettant en oeuvre une régulation cycle à cycle de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du moins un autre cylindre sur la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre de référence ; et
  • les moyens de commande de l'alimentation du au moins un autre cylindre comprennent des moyens formant cartographie auto-adaptative propres à calculer une valeur de correction de l'alimentation du au moins un autre cylindre en fonction du régime de rotation du moteur et du couple moteur.
According to other features, the system is characterized in that:
  • the control means are adapted to control the fuel flow injected into the cylinders by the supply means as a function of a fuel flow set point for each cylinder, and in that the system comprises means for estimating the flow rate fuel injected into the reference cylinder as a function of the acquired pressure thereof;
  • the servo means comprise means for mapping the correction of the reference flow rate of the reference cylinder as a function of the difference between the flow setpoint and the estimated flow;
  • the supply means comprise common feed rail means, the system comprises means for acquiring the pressure of the common feed rail means, and the servocontrol means are adapted to enslave the feed of the cylinder reference as a function of the pressure acquired from the means with common feed ramp;
  • the means for acquiring the speed of rotation of the motor shaft generated by the displacement of the piston of the reference cylinder and the speed of rotation of the motor shaft generated by the displacement of the piston of the at least one other cylinder comprise means for acquiring the rotational speed of the engine and means for determining the rotational speeds of the shaft engine generated by the displacement of these pistons according to the acquired regime;
  • the control means of the supply of the at least one other cylinder are able to modify the supply setpoint thereof as a function of the difference between the rotational speed of the motor shaft generated by the displacement of the piston of the cylinder reference and rotational speed of the motor shaft generated by the displacement of the piston of at least one other cylinder;
  • the means for controlling the supply of the at least one other cylinder comprise means for regulating cycle-to-cycle speed by implementing a cycle-to-cycle regulation of the rotational speed of the motor shaft generated by the displacement of the piston of the less another cylinder on the speed of rotation of the motor shaft generated by the displacement of the piston of the reference cylinder; and
  • the means for controlling the supply of the at least one other cylinder comprise means for self-adaptive mapping suitable for calculating a value of correction of the supply of the at least one other cylinder as a function of the rotational speed of the motor and the torque engine.

La présente invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple, et prise en relation avec les dessins annexés, dans lesquels :

  • la figure 1 est une vue schématique d'un système selon l'invention associé à un moteur Diesel à rampe commune d'alimentation ;
  • la figure 2 est une vue schématique d'une unité de pilotage entrant dans la constitution du système de la figure 1 ; et
  • la figure 3 est une vue schématique de moyens de régulation de vitesse entrant dans la constitution de l'unité de pilotage de la figure 2.
The present invention will be better understood on reading the description which follows, given solely by way of example, and taken in conjunction with the appended drawings, in which:
  • Figure 1 is a schematic view of a system according to the invention associated with a diesel engine common rail supply;
  • Figure 2 is a schematic view of a steering unit forming part of the system of Figure 1; and
  • FIG. 3 is a schematic view of speed regulation means forming part of the control unit of FIG. 2.

Sur la figure 1, on a illustré sous la référence générale 10 un moteur Diesel pour véhicule automobile équipé par exemple de quatre cylindres 12a, 12b, 12c, 12d.In FIG. 1, there is illustrated generally a diesel engine for a motor vehicle equipped for example with four cylinders 12a, 12b, 12c, 12d.

Chaque cylindre 12a, 12b, 12c, 12d du moteur 10 comprend un injecteur 14a, 14b, 14c, 14d, une culasse 18a, 18b, 18c, 18d, un piston 20a, 20b, 20c, 20d et une chambre de combustion 22a, 22b, 22c, 22d délimitée par le piston et la culasse du cylindre.Each cylinder 12a, 12b, 12c, 12d of the engine 10 comprises an injector 14a, 14b, 14c, 14d, a cylinder head 18a, 18b, 18c, 18d, a piston 20a, 20b, 20c, 20d and a combustion chamber 22a, 22b , 22c, 22d delimited by the piston and cylinder head.

L'injecteur du cylindre, compris dans la culasse de celui-ci, est raccordé à une rampe commune d'alimentation 24 du moteur et est adapté pour alimenter la chambre de combustion 22a, 22b, 22c, 22d du cylindre en carburant selon une stratégie d'injection prédéterminée selon par exemple au moins une injection pilote et une injection principale de carburant, comme cela est connu dans l'état de la technique.The injector of the cylinder, included in the cylinder head thereof, is connected to a common supply rail 24 of the engine and is adapted to supply the combustion chamber 22a, 22b, 22c, 22d of the fuel cylinder according to a strategy predetermined injection according to for example at least one pilot injection and a main injection of fuel, as known in the state of the art.

Un cylindre, par exemple le cylindre 12a désigné dans la suite de la description comme cylindre de « référence », est par ailleurs associé à une chaîne 26 d'acquisition de pression dans le cylindre. Cette chaîne 26 d'acquisition comprend par exemple un capteur 28 de déformation à élément piézoélectrique inséré dans la culasse 18a du cylindre de référence 12a ou intégré à la bougie de préchauffage (non représentée) de celui-ci, et propre à mesurer des déformations de la culasse 18a sous l'effet de variations de pression dans la chambre de combustion 22a du cylindre 12a.A cylinder, for example the cylinder 12a designated in the rest of the description as a "reference" cylinder, is also associated with a chain 26 for acquiring pressure in the cylinder. This acquisition chain 26 comprises for example a piezoelectric element deformation sensor 28 inserted into the cylinder head 18a of the reference cylinder 12a or integrated with the glow plug (not shown) thereof, and suitable for measuring deformation of the yoke 18a under the effect of pressure variations in the combustion chamber 22a of the cylinder 12a.

Les pistons 20a, 20b, 20c, 20d sont raccordés à un arbre moteur 30 du moteur 10. L'arbre moteur 30 est associé à une chaîne 32 d'acquisition du régime de rotation du moteur, comprenant par exemple un capteur à effet Hall associé à une roue dentée fixée sur l'arbre moteur.The pistons 20a, 20b, 20c, 20d are connected to a motor shaft 30 of the motor 10. The motor shaft 30 is associated with a chain 32 for acquiring the rotational speed of the motor, comprising, for example, an associated Hall effect sensor. to a toothed wheel fixed on the motor shaft.

Une chaîne d'acquisition de l'angle moteur est également associée à l'arbre moteur 30. Cette chaîne est par exemple confondue avec la chaîne 32 d'acquisition du régime, cette chaîne étant conçue pour l'acquisition de ces deux grandeurs, comme cela est connu en soi dans l'état de la technique.A motor angle acquisition chain is also associated with the motor shaft 30. This chain is for example merged with the speed acquisition chain 32, this chain being designed for the acquisition of these two magnitudes, as this is known per se in the state of the art.

Une chaîne 34 d'acquisition de la pression dans la rampe commune d'alimentation 24 est par ailleurs agencée dans la rampe commune d'alimentation 24 pour la mesure de la pression dans celle-ci, comme cela est connu en soi dans l'état de la technique.A chain 34 for acquiring the pressure in the common feed ramp 24 is moreover arranged in the common feed ramp 24 for measuring the pressure therein, as is known per se in the state of the technique.

Une chaîne d'acquisition 36 du couple moteur souhaité par le conducteur est également prévue et comporte par exemple un capteur de la position de la pédale d'accélérateur du véhicule, comme cela est connu en soi dans l'état de la technique.An acquisition chain 36 of the engine torque desired by the driver is also provided and comprises, for example, a sensor of the position of the accelerator pedal of the vehicle, as is known per se in the state of the art.

Les chaînes 26, 32, 34, 36 d'acquisition de pression dans le cylindre de référence 12a, du régime moteur, de l'angle de l'arbre moteur, de la pression dans la rampe commune d'alimentation et du couple moteur souhaité sont raccordées à une unité de contrôle et de traitement d'informations 38. L'unité 38 est adaptée pour commander le fonctionnement du moteur en fonction des mesures délivrées par celles-ci et notamment pour corriger les dérives de l'injection de carburant dans les cylindres.The chains 26, 32, 34, 36 for acquiring pressure in the reference cylinder 12a, the engine speed, the angle of the drive shaft, the pressure in the common feed ramp and the desired engine torque are connected to a control and information processing unit 38. The unit 38 is adapted to control the operation of the engine according to the measurements delivered by them and in particular to correct the drifts of the fuel injection into the cylinders.

L'unité 38 de contrôle est raccordée aux injecteurs 14a, 14b, 14c, 14d des cylindres et à la rampe commune d'alimentation 24 et est adaptée pour commander différents paramètres de fonctionnement de ceux-ci comme par exemple le débit de carburant injecté dans les cylindres 12a, 12b, 12c, 12d par les injecteurs 14a, 14b, 14c, 14d.The control unit 38 is connected to the injectors 14a, 14b, 14c, 14d of the cylinders and to the common feed ramp 24 and is adapted to control various operating parameters thereof, such as, for example, the flow of fuel injected into the cylinders 12a, 12b, 12c, 12d by the injectors 14a, 14b, 14c, 14d.

La figure 2 est une vue schématique de l'unité de contrôle 38.FIG. 2 is a schematic view of the control unit 38.

L'unité 38 comprend des premiers moyens 50 formant cartographie connectés pour recevoir le régime R et le couple C acquis et propres à évaluer, pour ces deux valeurs, une cartographie prédéterminée de consignes de débit en fonction de couples de valeurs de régime moteur et de couple moteur, comme cela est connu en soi dans l'état de la technique. Les premiers moyens 50 délivrent en sortie une consigne de débit Da, Db, Dc, Dd pour chaque cylindre 12a, 12b, 12c, 12d du moteur 10.The unit 38 comprises first mapping means 50 connected to receive the R regime and the pair C acquired and able to evaluate, for these two values, a predetermined map of flow instructions as a function of torque values of engine speed and motor torque, as is known per se in the state of the art. The first means 50 output a flow instruction Da, Db, Dc, Dd for each cylinder 12a, 12b, 12c, 12d of the engine 10.

L'unité 38 comprend également des moyens 52 d'asservissement adaptés pour asservir le débit de carburant dans le cylindre de référence 12a sur sa consigne de débit Da correspondante en fonction de la pression Pa acquise de celui-ci.The unit 38 also comprises servo-control means 52 adapted to control the fuel flow in the reference cylinder 12a on its corresponding flow setpoint Da as a function of the pressure Pa acquired therefrom.

Ces moyens 52 d'asservissement comprennent un module 54 d'estimation du débit injecté dans le cylindre 12a de référence en fonction de la pression Pa acquise et de l'angle de l'arbre moteur θ acquis sur une plage angulaire prédéterminée.These servocontrol means 52 comprise a module 54 for estimating the flow rate injected into the reference cylinder 12a as a function of the pressure Pa acquired and the angle of the driving shaft θ acquired over a predetermined angular range.

Le module 54 est connecté à un soustracteur 56 par ailleurs connecté aux premiers moyens 50 formant cartographie. Ce soustracteur 56 forme la différence entre la consigne de débit Da délivrée par les moyens 50 et le débit estimé D̂a par les moyens 52 et délivre cette différence à des seconds moyens 58 formant cartographie de correction.The module 54 is connected to a subtractor 56 also connected to the first mapping means 50. This subtracter 56 forms the difference between the flow setpoint Da delivered by the means 50 and the estimated flow Da by the means 52 and delivers this difference to second means 58 forming correction mapping.

Les seconds moyens 58 mémorisent cette différence et déterminent une valeur ΔDa de recalage de la consigne de débit Da du cylindre de référence 12a calculée par les premiers moyens 50 formant cartographie.The second means 58 memorize this difference and determine a value ΔDa of resetting the flow setpoint Da of the reference cylinder 12a calculated by the first mapping means 50.

L'estimation du débit de carburant injecté dans le cylindre de référence en fonction de la pression dans celui-ci ainsi que le calcul de la valeur ΔDa de recalage de la consigne de débit Da sont par exemple détaillés dans la demande de brevet français FR 2 838 775 au nom de la demanderesse.The estimation of the fuel flow injected into the reference cylinder as a function of the pressure therein as well as the calculation of the value ΔDa of resetting of the flow instruction Da are for example detailed in the patent application French FR 2 838 775 in the name of the plaintiff.

Un additionneur 60 est connecté aux premiers et seconds moyens 58, 60 formant cartographie et additionne la consigne de débit Da à la valeur ΔDa de recalage de celle-ci afin de former une consigne de débit corrigée Dacorr pour le cylindre 12a de référence.An adder 60 is connected to the first and second mapping means 58, 60 and adds the flow setpoint Da to the reset value ΔDa thereof to form a corrected flow setpoint Dacorr for the reference cylinder 12a.

Cette consigne de débit corrigée Dacorr est délivrée à des moyens 62 de pilotage propres à commander les injecteurs 14a, 14b, 14c, 14d en fonction des consignes de débit qu'ils reçoivent, comme cela est connu en soi dans l'état de la technique.This corrected flow setpoint Dacorr is delivered to control means 62 for controlling the injectors 14a, 14b, 14c, 14d according to the flow instructions they receive, as is known per se in the state of the art. .

La valeur ΔDa est déterminée de telle sorte que l'application de la consigne de débit corrigée Dacorr, en tant que consigne effective pour le cylindre de référence 12a, a pour effet que le débit réel de carburant injecté dans celui-ci est sensiblement égal à la consigne de débit Da initialement déterminée par les premiers moyens 50 formant cartographie.The value ΔDa is determined in such a way that the application of the corrected flow setpoint Dacorr, as effective setpoint for the reference cylinder 12a, has the effect that the actual flow rate of fuel injected into it is substantially equal to the flow setpoint Da initially determined by the first mapping means 50.

L'unité 38 de contrôle comprend par ailleurs des moyens 64 connectés pour recevoir le régime R du moteur et l'angle de l'arbre moteur θ acquis. Les moyens 64 calculent en fonction de ceux-ci, et pour chaque cylindre 12a, 12b, 12c, 12d du moteur, la vitesse de rotation Va, Vb, Vc, Vd de l'arbre moteur générée par le déplacement du piston du cylindre, ci-après désignée par les termes « vitesse de rotation associée au cylindre ».The control unit 38 furthermore comprises means 64 connected to receive the R-speed of the engine and the angle of the motor shaft θ acquired. The means 64 calculate according to these, and for each cylinder 12a, 12b, 12c, 12d of the motor, the rotation speed Va, Vb, Vc, Vd of the motor shaft generated by the displacement of the piston of the cylinder, hereinafter referred to as "rotational speed associated with the cylinder".

Par exemple, les moyens 64 calculent la vitesse de rotation associée au cylindre en formant la moyenne du régime moteur R acquis sur une plage angulaire prédéterminée du cycle du cylindre. De préférence, cette plage angulaire est comprise dans la phase de détente du cycle du cylindre et correspond par exemple à la plage angulaire séparant le point mort haut du cycle du cylindre du point mort haut du cycle du cylindre dans lequel a lieu la prochaine combustion.For example, the means 64 calculate the speed of rotation associated with the cylinder by forming the average engine speed R acquired over a predetermined angular range of the cylinder cycle. Preferably, this angular range is included in the expansion phase of the cylinder cycle and corresponds, for example, to the angular range separating the top dead center of the cylinder cycle from the top dead center of the cylinder cycle in which the next combustion takes place.

Les moyens 64 sont connectés à des moyens 66 de calcul des différences de vitesses Vi-Va, où Vi désigne la vitesse de rotation associée à un cylindre autre que le cylindre de référence 12a, c'est-à-dire la vitesse de rotation Vb, Vc et Vd associée aux cylindres 12b, 12c et 12d respectivement.The means 64 are connected to means 66 for calculating the velocity differences Vi-Va, where Vi denotes the rotational speed associated with a cylinder other than the reference cylinder 12a, that is to say the rotation speed Vb , Vc and Vd associated with the cylinders 12b, 12c and 12d respectively.

Ces différences de vitesses de rotation Vi-Va sont délivrées par les moyens 66 de calcul à des moyens 68 de régulation de vitesse de rotation. Ces moyens 68 sont propres à déterminer des valeurs ΔDb, ΔDc et ΔDd de recalage des consignes de débit Db, Dc et Dd respectivement afin de réguler les vitesses de rotation associées aux cylindres 12b, 12c et 12d sur la vitesse de rotation associée au cylindre de référence 12a, comme cela sera expliqué plus en détail par la suite.These differences in rotation speeds Vi-Va are delivered by the calculation means 66 to means 68 for regulating speed of rotation. These means 68 are capable of determining values ΔDb, ΔDc and ΔDd of resetting the flow instructions Db, Dc and Dd, respectively, in order to regulate the rotational speeds associated with the cylinders 12b, 12c and 12d on the speed of rotation associated with the reference cylinder. 12a, as will be explained in more detail later.

Les valeurs ΔDb , ΔDc, ΔDd de recalage pour les consignes de débit Db, Dc, Dd sont délivrées à des additionneurs 70, 72 et 74 respectivement. Ces additionneurs 70, 72, 74 sont également connectés aux premiers moyens 50 formant cartographie et somment les consignes de débits Db, Dc, Dd calculées par les moyens 50 aux valeurs ΔDb, ΔDc, ΔDd de recalage respectivement afin de générer des consignes de débit corrigées Dbcorr, Dccorr, Ddcorr pour les cylindres 12b, 12c, 12d.The values ΔDb, ΔDc, ΔDd of adjustment for the flow instructions Db, Dc, Dd are delivered to adders 70, 72 and 74 respectively. These adders 70, 72, 74 are also connected to the first mapping means 50 and sum up the flow instructions Db, Dc, Dd calculated by the means 50 to the values ΔDb, ΔDc, ΔDd respectively to generate corrected flow instructions. Dbcorr, Dccorr, Ddcorr for cylinders 12b, 12c, 12d.

Ces consignes de débit corrigées Dbcorr, Dccorr, Ddcorr sont délivrées aux moyens 62 de pilotage qui commandent les injecteurs 14b, 14c, 14d des cylindres 12b, 12c, 12d en fonction des celles-ci.These corrected flow instructions Dbcorr, Dccorr, Ddcorr are delivered to the control means 62 which control the injectors 14b, 14c, 14d of the cylinders 12b, 12c, 12d according to these.

Chaque valeur ΔDb, ΔDc, ΔDd de recalage est déterminée de telle sorte que l'application de la consigne de débit corrigée Dbcorr, Dccorr, Ddcorr correspondante en tant que consigne effective pour le cylindre considéré a pour effet que la vitesse de rotation associée à ce cylindre est sensiblement égale à celle associée au cylindre de référence 12a, annulant de ce fait la différence de vitesses Vi-Va correspondante.Each adjustment value ΔDb, ΔDc, ΔDd is determined in such a way that the application of the corrected flow setpoint Dbcorr, Dccorr, Ddcorr corresponding as effective setpoint for the cylinder considered has the effect that the rotation speed associated with this cylinder is substantially equal to that associated with the reference cylinder 12a, thereby canceling the corresponding velocity difference Vi-Va.

Un mode de réalisation des moyens 68 de régulation de vitesse de rotation est illustré schématiquement sur la figure 3.One embodiment of the speed control means 68 is illustrated schematically in FIG. 3.

Dans ce mode de réalisation, les moyens 68 comprennent une boucle rapide de régulation de vitesse de rotation et une boucle lente de régulation de vitesse de rotation.In this embodiment, the means 68 comprise a fast speed control loop and a slow rate control loop.

La boucle rapide de régulation comprend des moyens 80, 82, 84 de régulation de vitesse de rotation cycle à cycle. Ces moyens 80, 82, 84 reçoivent en entrée les différences de vitesses de rotation Vi-Va et sont propres à calculer à chaque cycle moteur des premières valeurs ΔDb', ΔDc', ΔDd' de recalage des débits Db, Dc et Dd respectivement. Les moyens 80, 82, 84 mettent en oeuvre à cet effet une loi de régulation prédéterminée des vitesses de rotation associées aux cylindres 12b, 12c et 12d sur la vitesse de rotation associée au cylindre de référence 12a par exemple sous la forme d'une fonction de transfert prédéterminée entre chaque différence de vitesses de rotation Vi-Va et sa première valeur ΔDb', ΔDc', ΔDd' de recalage associée. Ces fonctions de transfert sont déterminées lors d'une étude antérieure. Par exemple, une même fonction de transfert est utilisée pour réguler l'ensemble des vitesses de rotation.The fast control loop comprises means 80, 82, 84 for regulating the rotation speed cycle to cycle. These means 80, 82, 84 receive as input the differences in rotation speeds Vi-Va and are suitable for calculating at each motor cycle the first values ΔDb ', ΔDc', ΔDd 'for resetting the flow rates Db, Dc and Dd respectively. The means 80, 82, 84 use for this purpose a predetermined regulation law rotational speeds associated with the cylinders 12b, 12c and 12d on the rotational speed associated with the reference cylinder 12a for example in the form of a function transfer predetermined between each rotation speed difference Vi-Va and its associated first value ΔDb ', ΔDc', ΔDd '. These transfer functions are determined in a previous study. For example, the same transfer function is used to regulate all the rotational speeds.

La boucle lente de régulation, qui présente une dynamique plus lente que celle de la boucle rapide, comprend des moyens 86, 88, 90 formant une cartographie dite « auto-adaptative » de régulation de vitesse de rotation. Les moyens 86, 88, 90 sont connectés aux moyens 80, 82, 84 de régulation de vitesse de rotation et sont propres à mémoriser les premières valeurs ΔDb', ΔDc', ΔDd' de recalage délivrées par ceux-ci en fonction de leur localisation dans le champ moteur défini par le couple moteur et le régime. Les moyens 86, 88, 90 sont également connectés aux chaînes d'acquisition du régime R et du couple C.The slow regulation loop, which has a slower dynamic than that of the fast loop, comprises means 86, 88, 90 forming a so-called "self-adaptive" speed control chart. The means 86, 88, 90 are connected to means 80, 82, 84 for regulating speed of rotation and are suitable for storing the first values ΔDb ', ΔDc', ΔDd 'of the reset delivered by them as a function of their location. in the motor field defined by the motor torque and the speed. The means 86, 88, 90 are also connected to the R and C pair acquisition chains.

Ces moyens 86, 88, 90 déterminent, en fonction des premières valeurs ΔDb', ΔDc' , ΔDd' de recalage mémorisées et des valeurs du régime R et du couple C reçues en entrée, des secondes valeurs ΔDb", ΔDc", ΔDd" de recalage des débits Db, Dc, Dd, en évaluant des cartographies prédéterminées respectives de valeurs de débits de recalage.These means 86, 88, 90 determine, as a function of the first stored values ΔDb ', ΔDc', ΔDd 'and the values of the speed R and the torque C received at the input, second values ΔDb ", ΔDc", ΔDd " of resetting flows Db, Dc, Dd, by evaluating respective predetermined maps of resetting flow rates.

Enfin, comme cela est visible sur la figure 3, des additionneurs 92, 94, 96 sont connectés aux moyens 80, 82, 84 de régulation de vitesse de rotation et aux moyens 86, 88, 90 formant cartographie.Finally, as can be seen in FIG. 3, adders 92, 94, 96 are connected to rotation speed regulating means 80, 82, 84 and mapping means 86, 88, 90.

Ces additionneurs 80, 82, 84 sont propres à additionner les premières valeurs ΔDb', ΔDc', ΔDd' de recalage aux secondes valeurs ΔDb", ΔDc", ΔDd" de recalage respectivement et à délivrer les sommes ΔDb' + ΔDb", ΔDc' + ΔDc", ΔDd' + ΔDd" correspondantes aux additionneurs 70, 72, 74 en tant que valeurs ΔDb, ΔDc, ΔDd de recalage des débits Db, Dc, Dd.These adders 80, 82, 84 are able to add the first values ΔDb ', ΔDc', ΔDd 'of registration to the second values ΔDb ", ΔDc", ΔDd "of registration respectively and to deliver the sums ΔDb' + ΔDb", ΔDc '+ ΔDc', ΔDd '+ ΔDd' corresponding to adders 70, 72, 74 as values ΔDb, ΔDc, ΔDd of resetting flow rates Db, Dc, Dd.

Claims (8)

Système de contrôle du fonctionnement d'un moteur Diesel (10) de véhicule automobile comprenant des moyens (14a, 14b, 14c, 14d, 24) d'alimentation en carburant des cylindres (12a, 12b, 12c, 12d) de celui-ci, le système comprenant des moyens (26) d'acquisition de la pression d'un cylindre (12a) de référence et des moyens (38) de pilotage des moyens d'alimentation en fonction de la pression acquise et d'une consigne prédéterminée d'alimentation en carburant pour chaque cylindre, caractérisé en ce que les moyens (38) de pilotage comprennent : - des moyens (52, 62) d'asservissement adaptés pour asservir l'alimentation en carburant du cylindre (12a) de référence sur sa consigne d'alimentation en fonction de la pression acquise; - des moyens (32, 64) d'acquisition de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre (12a) de référence et de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston d'au moins un autre cylindre (12b, 12c, 12d); et - des moyens (68, 70, 72, 74, 62) de commande adaptés pour commander l'alimentation en carburant de cet au moins un autre cylindre en fonction des vitesses acquises en asservissant la vitesse de rotation de l'arbre moteur générée par le déplacement du piston de cet au moins un autre cylindre (12b, 12c, 12d) sur la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre (12a) de référence. System for controlling the operation of a diesel engine (10) of a motor vehicle comprising means (14a, 14b, 14c, 14d, 24) for supplying fuel to the cylinders (12a, 12b, 12c, 12d) thereof , the system comprising means (26) for acquiring the pressure of a reference cylinder (12a) and means (38) for controlling the supply means as a function of the pressure acquired and a predetermined set point d supply of fuel for each cylinder, characterized in that the control means (38) comprise: - servo means (52, 62) adapted to control the supply of fuel to the cylinder (12a) of reference on its supply instruction as a function of the pressure acquired; means (32, 64) for acquiring the rotational speed of the motor shaft generated by the displacement of the piston of the reference cylinder (12a) and the speed of rotation of the motor shaft generated by the displacement of the piston of at least one other cylinder (12b, 12c, 12d); and control means (68, 70, 72, 74, 62) adapted to control the supply of fuel to this at least one other cylinder as a function of the speeds acquired by controlling the speed of rotation of the motor shaft generated by the displacing the piston of this at least one other cylinder (12b, 12c, 12d) on the rotational speed of the motor shaft generated by the displacement of the piston of the reference cylinder (12a). Système selon la revendication 1, caractérisé en ce que les moyens (38) de pilotage sont adaptés pour piloter le débit de carburant injecté dans les cylindres par les moyens d'alimentation en fonction d'une consigne de débit de carburant pour chaque cylindre, et en ce que le système comprend des moyens (54) d'estimation du débit de carburant injecté dans le cylindre (12a) de référence en fonction de la pression acquise de celui-ci.System according to claim 1, characterized in that the control means (38) are adapted to control the flow of fuel injected into the cylinders by the supply means as a function of a fuel flow set point for each cylinder, and in that the system comprises means (54) for estimating the fuel flow injected into the reference cylinder (12a) as a function of the acquired pressure thereof. Système selon la revendication 2, caractérisé en ce que les moyens (52) d'asservissement comprennent des moyens (58) formant cartographie de correction de la consigne de débit du cylindre de référence en fonction de la différence entre la consigne de débit et le débit estimé.System according to Claim 2, characterized in that the servo-control means (52) comprise means (58) forming a cartography for correcting the reference flow rate of the reference cylinder as a function of the difference between the flow setpoint and the flow rate. valued. Système selon la revendication 1, 2 ou 3, caractérisé en ce que les moyens (14a, 14b, 14c, 14d, 24) d'alimentation comprennent des moyens (24) à rampe commune d'alimentation, en ce que le système comprend des moyens (34) d'acquisition de la pression des moyens à rampe commune d'alimentation, et en ce que les moyens (52) d'asservissement sont propres à asservir l'alimentation du cylindre de référence en fonction de la pression acquise des moyens à rampe commune d'alimentation.System according to Claim 1, 2 or 3, characterized in that the supply means (14a, 14b, 14c, 14d, 24) comprise means (24) for common supply rail, in that the system comprises means (34) for acquiring the pressure of the common feed rail means, and in that the means (52) of servocontrol are adapted to enslave the feeding of the reference cylinder as a function of the pressure acquired by the common feed rail means. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que les moyens (32, 64) d'acquisition de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre (12a) de référence et de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du au moins un autre cylindre (12b, 12c, 12d) comprennent des moyens (32) d'acquisition du régime de rotation du moteur et des moyens (64) de détermination des vitesses de rotation de l'arbre moteur générées par le déplacement de ces pistons en fonction du régime acquis.System according to any one of the preceding claims, characterized in that the means (32, 64) for acquiring the speed of rotation of the motor shaft generated by the displacement of the piston of the reference cylinder (12a) and the rotational speed of the motor shaft generated by the displacement of the piston of the at least one other cylinder (12b, 12c, 12d) comprise means (32) for acquisition of the rotational speed of the engine and means (64) for determining rotational speeds of the motor shaft generated by the displacement of these pistons according to the acquired regime. Système selon la revendication 5, caractérisé en ce que les moyens (68, 70, 72, 74, 62) de commande de l'alimentation du au moins un autre cylindre sont propres à modifier la consigne d'alimentation de celui-ci en fonction de la différence entre la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre (12a) de référence et la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du au moins un autre cylindre (12b, 12c, 12d).System according to claim 5, characterized in that the means (68, 70, 72, 74, 62) for controlling the supply of the at least one other cylinder are adapted to modify the supply setpoint of the latter in function the difference between the rotational speed of the motor shaft generated by the displacement of the piston of the reference cylinder (12a) and the rotational speed of the motor shaft generated by the displacement of the piston of the at least one other cylinder (12b) , 12c, 12d). Système selon la revendication 6, caractérisé en ce que les moyens (68) de commande de l'alimentation du au moins un autre cylindre comprennent des moyens (80, 82, 84) de régulation de vitesse cycle à cycle mettant en oeuvre une régulation cycle à cycle de la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du moins un autre cylindre (12b, 12c, 12d) sur la vitesse de rotation de l'arbre moteur générée par le déplacement du piston du cylindre de référence (12a).System according to Claim 6, characterized in that the means (68) for controlling the supply of the at least one other cylinder comprise means (80, 82, 84) for regulating cycle-to-cycle speed using cycle regulation. with rotation cycle of the motor shaft generated by the displacement of the piston of at least one other cylinder (12b, 12c, 12d) on the rotational speed of the motor shaft generated by the displacement of the piston of the reference cylinder (12a). Système selon la revendication 6 ou 7, caractérisé en ce que les moyens (68) de commande de l'alimentation du au moins un autre cylindre comprennent des moyens (86, 88, 90) formant cartographie auto-adaptative propres à calculer une valeur de correction de l'alimentation du au moins un autre cylindre (12b, 12c, 12d) en fonction du régime de rotation du moteur et du couple moteur.System according to Claim 6 or 7, characterized in that the means (68) for controlling the supply of the at least one other cylinder comprise means (86, 88, 90) forming a self-adaptive mapping suitable for calculating a value of correction of the supply of the at least one other cylinder (12b, 12c, 12d) as a function of the rotational speed of the engine and the engine torque.
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US7765979B2 (en) 2010-08-03
JP2006342806A (en) 2006-12-21
US20060272612A1 (en) 2006-12-07
EP1731745B1 (en) 2015-04-22
JP2012036903A (en) 2012-02-23
FR2886680B1 (en) 2007-09-28
FR2886680A1 (en) 2006-12-08

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