EP1637723A1 - System for supplying an automotive internal combustion engine with fuel and method for regulating the fuel pressure of such an engine - Google Patents

System for supplying an automotive internal combustion engine with fuel and method for regulating the fuel pressure of such an engine Download PDF

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Publication number
EP1637723A1
EP1637723A1 EP05300739A EP05300739A EP1637723A1 EP 1637723 A1 EP1637723 A1 EP 1637723A1 EP 05300739 A EP05300739 A EP 05300739A EP 05300739 A EP05300739 A EP 05300739A EP 1637723 A1 EP1637723 A1 EP 1637723A1
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EP
European Patent Office
Prior art keywords
motor
fuel
supply current
pump
regulating
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EP05300739A
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German (de)
French (fr)
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EP1637723B1 (en
Inventor
Thierry Planas
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Renault SAS
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Renault SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps

Definitions

  • the present invention relates to a system for supplying fuel to an internal combustion engine of a motor vehicle. It also relates to a method for regulating the fuel supply pressure of such an engine.
  • the fuel pump coupled to the engine provides excess power during all other operating phases of the engine.
  • the regulation implemented in the document US Pat. No. 5,842,454 uses a measurement of the rotational speed of the engine, which is representative of the fuel flow, or a measurement of the voltage at the motor terminals, which is representative of the speed of the motor. rotation of the motor.
  • the regulation implemented in the document US 6,609,501 is based on a comparison between the fuel pressure and a target fuel pressure, a regulation of the motor supply current being implemented as soon as the supply pressure reaches or exceeds the target value. This technique therefore also requires the provision of a pressure sensor forming a switch.
  • the object of the invention is to overcome the drawbacks of the fuel supply systems according to the state of the art by limiting, in particular, the use of sensors to regulate the fuel pressure delivered by the system.
  • a fuel supply system for an internal combustion engine of a motor vehicle comprising a fuel tank, a pump driven by an electric motor and means for regulating the supply current. of the motor.
  • This power system comprises means for measuring the motor supply current, the means for regulating the motor supply current being adapted to regulate the speed of rotation of the motor only by regulating the motor supply current around the motor.
  • a supply current setpoint representative of a fuel pressure level downstream of the pump.
  • This supply system therefore requires only the use of a single sensor and therefore does not require any sensor to, in particular, measure the pressure and / or the flow of fuel downstream of the pump, or to measure the rotational speed motor, or to measure the voltage across the motor of the pump.
  • this solution makes it possible to regulate the pressure downstream of the pump, by implementing a simple regulation of the motor supply current, a flow delivered by the pump, providing a given pressure level downstream. of it, being related to the level of motor power supply.
  • means are provided for calculating the speed of rotation of the motor from a measurement of the motor supply current and for adapting the current setpoint value as a function of the speed. motor rotation.
  • the system comprises means for measuring the frequency of the motor supply current, means for converting the measured frequency into the speed of rotation of the motor and means comparing the rotational speed of the motor resulting from said comparison with at least one rotational speed reference value to adapt the current reference value.
  • the latter further comprises a retention tank housed inside the tank, in which there is a duct connected to the pump and providing an excess fuel return circuit for maintaining a substantially constant fuel level in the holding tank.
  • the fuel return circuit is equipped with a fuel filter.
  • this filter may be arranged downstream of the pump.
  • the speed of rotation of the motor is regulated solely by regulating the motor supply current around a supply current setpoint value representative of a fuel pressure level downstream of the pump.
  • the motor supply current is measured, the rotational speed of the motor is calculated from the measurement of the motor supply current and the current reference value is adapted according to the speed of rotation of the engine.
  • the rotational speed of the motor is calculated by measuring the frequency of the motor supply current and converting the measured frequency into a corresponding rotational speed.
  • FIG. 1 there is shown a fuel supply system according to the invention, designated by the general numerical reference 10.
  • This system is intended for supplying an internal combustion engine of a motor vehicle.
  • This system essentially comprises a tank 12 of fuel, supplying an injection device 14 of a heat engine 16.
  • the tank 12 is internally provided with a fuel retention tank 18 in which is practiced a small orifice 20, that is to say of negligible size relative to the bottom surface of the retention tank 18.
  • the reservoir 12 is also provided with a fuel pump 22 controlled by an external control electronic card 24, or internal, to the tank. It ensures the aspiration of the fuel from the retention tank 18.
  • a pipe 26 connected to the fuel pump 22 and equipped with a fuel filter 28 dives into the retention tank 18.
  • a second pipe 29 extends between the injection system 14 and the pump 22.
  • the second pipe can be equipped with a fuel filter 31 instead of the filter in the retention tank.
  • a fuel return line 32 is provided between the pressure regulator 30 and the retention tank 18 or, alternatively, as shown in dotted lines, directly in the rest of the tank in order to reinject the excess fuel.
  • This pipe makes it possible, by Venturi effect in the tank 20, to keep the level of fuel in the tank 18 substantially constant.
  • the fuel pump 22 comprises an electric motor 34 controlled by the electronic control card 24 and a hydraulic pump 36 driven by the motor 34.
  • the motor supply current 34 is regulated by the control card 24.
  • This card 24 controls the electric motor 34 of the fuel pump only by regulation.
  • the motor supply current which is always powered by a DC voltage, without the use of any sensors.
  • the motor supply current is regulated around a set point capable of obtaining a rotational speed of the motor making it possible to obtain a target current pressure downstream of the pump, and this in function characteristics of the pump binding the pressure as a function of the fuel flow.
  • the characteristics of the pump linking the pressure depending on the flow rate may vary depending on the fuel flow through the pump, the set value is developed or adapted depending on the flow. For this purpose, the value of the motor supply current, which translates the fuel flow through the pump, is used to correct the current setpoint.
  • FIG. 3 shows the block diagram of the electronic control card 24 making it possible to regulate the pump 22.
  • this card 24 comprises a DC voltage converter 38 receiving, as input, a supply voltage Ve delivered by the vehicle's on-board network R and delivering, as output, an output voltage Vs of supplying the motor 34 of the pump 22.
  • this card 24 is associated with a device 40 of measurement of the motor supply current which, as indicated above, reflects the pressure of the current downstream of the pump, according to the characteristics of the pump establishing a pressure level as a function of the flow rate delivered by the pump.
  • the measured current delivered by the measuring member 40 is compared, after filtering by means of an appropriate filtering member 42, with a current reference value CONS by means of a comparator 44.
  • the error thus calculated is presented at the input of a regulator 46 and then at the input of a control stage 48 to produce a control signal S for the voltage converter 38.
  • the voltage converter 38 comprises a set of switching cells based on bipolar transistors, MOSFET transistors, ... driven by pulse width modulation by the control stage 48 so as to obtain a level of target current.
  • the card 24 is completed by a correction stage 50 adapted to correct the current setpoint as a function of the fuel flow, insofar as, as indicated above, the characteristics of the pump binding the pressure Depending on the flow of fuel passing through the pump, and depending on the supply current of the motor 34, the fuel consumption depends on the flow rate. This correction is also based on a measurement of the current delivered by the measuring element 40.
  • the frequency detection stage 52 measures the frequency f of the supply current (step 58).
  • the conversion stage 54 then calculates the rotation speed of the motor (step 60).
  • the rotational speed of the motor is then compared to a reference speed VIT by means of a comparator 62.
  • the difference thus calculated is then presented at the input of a corrector 64 to insert into the result of the comparison between the current measurement. filtered and the current setpoint, a correction component of the current setpoint as a function of the rotational speed of the motor.
  • this compensation makes it possible to adapt the current setpoint to the speed of rotation of the motor and, in particular, to overcome the non-linearities of the fuel pump.
  • the electronic control card In operation, when starting the heat engine, the voltage delivered by the vehicle battery, which is available on the vehicle's on-board system, is applied to the electronic control card. This card then starts the electric motor of the pump and a regulation of the supply current of this motor around a current setpoint representative of the nominal operating pressure of the fuel supply circuit.
  • the current setpoint value can be held fixed throughout the application of the voltage of the onboard network and, therefore, as long as the vehicle is in operation.
  • the control of the electric motor of the pump has been illustrated in an application according to which the motor is a DC electric motor with brush.
  • the direct current is polyphase and frequency-controlled.
  • the rotational speed of the electric motor can therefore be directly deduced from the driving frequency.
  • the current regulation described above applies in turn in parallel to all of the phase currents.

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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)
  • Hybrid Electric Vehicles (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The system has a fuel pump driven by an electric motor (34), an electronic circuit board (24) to regulate electric motor supply current, and an electric motor supply current measuring unit (40). The regulating unit regulates rotating speed of the motor by regulating the motor supply current about a desired value of supply current representative of a fuel pressure level downstream the pump. An independent claim is also included for a method to regulate fuel supply pressure of an internal combustion engine.

Description

La présente invention concerne un système d'alimentation en carburant d'un moteur à combustion interne de véhicule automobile. Elle se rapporte également à un procédé de régulation de la pression d'alimentation en carburant d'un tel moteur.The present invention relates to a system for supplying fuel to an internal combustion engine of a motor vehicle. It also relates to a method for regulating the fuel supply pressure of such an engine.

De nombreux systèmes d'alimentation en carburant existent et comprennent notamment un réservoir de carburant et une pompe à carburant couplée à un moteur électrique. Le moteur électrique, durant toutes les phases de fonctionnement du moteur thermique du véhicule, fonctionne à une vitesse de rotation constante.Many fuel systems exist and include a fuel tank and a fuel pump coupled to an electric motor. The electric motor, during all phases of operation of the engine of the vehicle, operates at a constant speed of rotation.

En raison d'un besoin de débit élevé en carburant à chaque phase de démarrage du véhicule, la pompe en carburant, couplée au moteur thermique, fournit du courant en excès durant toutes les autres phases de fonctionnement du moteur thermique.Due to the need for high fuel flow at each start-up phase of the vehicle, the fuel pump coupled to the engine provides excess power during all other operating phases of the engine.

C'est la raison pour laquelle on prévoit, dans les systèmes d'alimentation conventionnels, un circuit de retour de carburant en excès afin de rediriger l'excès de carburant dans le réservoir. Cette réinjection de carburant en excès peut s'effectuer soit directement dans le réservoir, soit dans un bac de rétention utilisé pour maintenir un niveau de carburant toujours suffisant pour ne pas désamorcer la pompe à carburant, même lorsqu'il n'y a plus beaucoup de carburant dans le réservoir. Le moteur électrique consomme donc de l'énergie inutilement, car en dehors des phases de démarrage, il fournit un débit excessif de carburant par rapport aux besoins du moteur thermique.This is the reason why in conventional fuel systems, an excess fuel return circuit is provided to redirect the excess fuel into the tank. This reinjection of excess fuel can be carried out either directly in the tank or in a holding tank used to maintain a fuel level always sufficient not to defuse the fuel pump, even when there is not much fuel in the tank. The electric motor therefore consumes energy unnecessarily because, apart from the start-up phases, it provides an excessive flow of fuel in relation to the needs of the heat engine.

Pour pallier cet inconvénient, il a été proposé, dans le document US-A-4 756 291, d'appliquer une tension au moteur électrique en fonction du débit de carburant souhaité et, ainsi, d'obtenir un débit proportionnel à cette tension. Or, une telle solution nécessite de prévoir un certain nombre de capteurs et engendre dès lors des mises au point onéreuses.To overcome this drawback, it has been proposed in document US Pat. No. 4,756,291 to apply a voltage to the electric motor as a function of the desired fuel flow and, thus, to obtain a flow proportional to this voltage. However, such a solution requires to provide a number of sensors and therefore generates expensive adjustments.

Dans les documents EP-A-0 644 322 et WO 98/27333, il est proposé de réguler le débit d'alimentation en carburant d'un moteur de véhicule automobile en commandant la pompe à carburant de manière à maintenir le débit d'alimentation à un niveau suffisant pour que les injecteurs fonctionnent linéairement, ce qui nécessite également l'emploi de divers capteurs coûteux.In documents EP-A-0 644 322 and WO 98/27333, it is proposed to regulate the fuel supply rate of a motor vehicle engine by controlling the fuel pump so as to maintain the feed rate at a level sufficient for the injectors to operate linearly, which also requires the use of various expensive sensors.

On pourra également se référer aux documents US 6,609,501 et US 5,842,454, dans lesquels il est proposé de réguler la pression d'alimentation du carburant à partir d'une régulation du courant d'alimentation du moteur.Reference may also be made to US Pat. No. 6,609,501 and US Pat. No. 5,842,454, in which it is proposed to regulate the fuel supply pressure from a regulation of the motor supply current.

En particulier, la régulation mise en oeuvre dans le document US 5,842,454 utilise une mesure de la vitesse de rotation du moteur, qui est représentative du débit de carburant, ou une mesure de la tension aux bornes du moteur, qui est représentative de la vitesse de rotation du moteur. La régulation mise en oeuvre dans le document US 6,609,501 est basée sur une comparaison entre la pression de carburant et une pression de carburant cible, une régulation du courant d'alimentation du moteur étant mise en oeuvre dès que la pression d'alimentation atteint ou dépasse la valeur cible. Cette technique nécessite donc également de prévoir un capteur de pression formant interrupteur.In particular, the regulation implemented in the document US Pat. No. 5,842,454 uses a measurement of the rotational speed of the engine, which is representative of the fuel flow, or a measurement of the voltage at the motor terminals, which is representative of the speed of the motor. rotation of the motor. The regulation implemented in the document US 6,609,501 is based on a comparison between the fuel pressure and a target fuel pressure, a regulation of the motor supply current being implemented as soon as the supply pressure reaches or exceeds the target value. This technique therefore also requires the provision of a pressure sensor forming a switch.

Au vu de ce qui précède, le but de l'invention est de pallier les inconvénients des systèmes d'alimentation en carburant selon l'état de la technique en limitant, notamment, l'emploi de capteurs pour réguler la pression du carburant délivrée par le système.In view of the above, the object of the invention is to overcome the drawbacks of the fuel supply systems according to the state of the art by limiting, in particular, the use of sensors to regulate the fuel pressure delivered by the system.

Selon l'invention, il est donc proposé un système d'alimentation en carburant d'un moteur à combustion interne de véhicule automobile, comprenant un réservoir de carburant, une pompe entraînée par un moteur électrique et des moyens de régulation du courant d'alimentation du moteur.According to the invention, it is therefore proposed a fuel supply system for an internal combustion engine of a motor vehicle, comprising a fuel tank, a pump driven by an electric motor and means for regulating the supply current. of the motor.

Ce système d'alimentation comporte des moyens de mesure du courant d'alimentation du moteur, les moyens de régulation du courant d'alimentation du moteur étant adaptés pour réguler la vitesse de rotation du moteur uniquement en régulant le courant d'alimentation du moteur autour d'une valeur de consigne de courant d'alimentation représentative d'un niveau de pression de carburant en aval de la pompe.This power system comprises means for measuring the motor supply current, the means for regulating the motor supply current being adapted to regulate the speed of rotation of the motor only by regulating the motor supply current around the motor. a supply current setpoint representative of a fuel pressure level downstream of the pump.

Ce système d'alimentation ne nécessite donc que l'emploi d'un unique capteur et ne nécessite donc aucun capteur pour, notamment, mesurer la pression et/ou le débit du carburant en aval de la pompe, ou pour mesurer la vitesse de rotation du moteur, ou encore pour mesurer la tension aux bornes du moteur de la pompe. En outre, cette solution permet d'effectuer une régulation de la pression en aval de la pompe, en mettant en oeuvre une simple régulation du courant d'alimentation du moteur, un débit délivré par la pompe, procurant un niveau de pression donné en aval de celle-ci, étant lié au niveau de courant d'alimentation du moteur.This supply system therefore requires only the use of a single sensor and therefore does not require any sensor to, in particular, measure the pressure and / or the flow of fuel downstream of the pump, or to measure the rotational speed motor, or to measure the voltage across the motor of the pump. In addition, this solution makes it possible to regulate the pressure downstream of the pump, by implementing a simple regulation of the motor supply current, a flow delivered by the pump, providing a given pressure level downstream. of it, being related to the level of motor power supply.

Selon une autre caractéristique du système selon l'invention, on prévoit des moyens pour calculer la vitesse de rotation du moteur à partir d'une mesure du courant d'alimentation du moteur et pour adapter la valeur de consigne du courant en fonction de la vitesse de rotation du moteur.According to another characteristic of the system according to the invention, means are provided for calculating the speed of rotation of the motor from a measurement of the motor supply current and for adapting the current setpoint value as a function of the speed. motor rotation.

Dans un mode de réalisation, pour adapter la valeur de consigne de courant, le système comporte des moyens de mesure de la fréquence du courant d'alimentation du moteur, des moyens de conversion de la fréquence mesurée en vitesse de rotation du moteur et des moyens de comparaison de la vitesse de rotation du moteur résultant de ladite comparaison avec au moins une valeur de consigne de vitesse de rotation pour adapter la valeur de consigne de courant.In one embodiment, in order to adapt the current set point value, the system comprises means for measuring the frequency of the motor supply current, means for converting the measured frequency into the speed of rotation of the motor and means comparing the rotational speed of the motor resulting from said comparison with at least one rotational speed reference value to adapt the current reference value.

Selon une autre caractéristique du système selon l'invention, celui-ci comporte en outre un bac de rétention logé à l'intérieur du réservoir, dans lequel se trouve un conduit relié à la pompe et constituant un circuit de retour de carburant en excès pour maintenir un niveau de carburant sensiblement constant dans le bac de rétention.According to another characteristic of the system according to the invention, the latter further comprises a retention tank housed inside the tank, in which there is a duct connected to the pump and providing an excess fuel return circuit for maintaining a substantially constant fuel level in the holding tank.

Dans un mode de réalisation, le circuit de retour de carburant est équipé d'un filtre de carburant. Cependant, ce filtre peut-être disposé en aval de la pompe.In one embodiment, the fuel return circuit is equipped with a fuel filter. However, this filter may be arranged downstream of the pump.

Selon l'invention, il est également proposé un procédé de régulation du débit d'alimentation en carburant d'un moteur à combustion interne, selon lequel on régule le courant d'alimentation d'un moteur électrique d'entraînement d'une pompe à carburant.According to the invention, there is also provided a method for regulating the fuel supply flow rate of an internal combustion engine, according to which the supply current of an electric drive motor of a fuel pump is regulated. fuel.

Selon ce procédé, on régule la vitesse de rotation du moteur uniquement en régulant le courant d'alimentation du moteur autour d'une valeur de consigne de courant d'alimentation représentative d'un niveau de pression de carburant en aval de la pompe.According to this method, the speed of rotation of the motor is regulated solely by regulating the motor supply current around a supply current setpoint value representative of a fuel pressure level downstream of the pump.

De préférence, selon ce procédé, on mesure le courant d'alimentation du moteur, on calcule la vitesse de rotation du moteur à partir de la mesure du courant d'alimentation du moteur et l'on adapte la valeur de consigne de courant en fonction de la vitesse de rotation du moteur.Preferably, according to this method, the motor supply current is measured, the rotational speed of the motor is calculated from the measurement of the motor supply current and the current reference value is adapted according to the speed of rotation of the engine.

Dans un mode de mise en oeuvre de ce procédé, la vitesse de rotation du moteur est calculée par mesure de la fréquence du courant d'alimentation du moteur et conversion de la fréquence mesurée en une vitesse de rotation correspondante.In one embodiment of this method, the rotational speed of the motor is calculated by measuring the frequency of the motor supply current and converting the measured frequency into a corresponding rotational speed.

D'autre buts, caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante, donnée uniquement à titre d'exemple non limitatif et faite en référence aux dessins annexés sur lesquels :

  • la figure 1 illustre, de manière schématique, la structure générale d'un système d'alimentation en carburant d'un moteur à combustion interne de véhicule automobile ;
  • la figure 2 illustre un autre mode de réalisation du système de la figure 1 ;
  • la figure 3 et un schéma synoptique illustrant la structure générale des moyens de régulation du système d'alimentation de la figure 1 ; et
  • la figure 4 illustre le mode de régulation de la vitesse de rotation du moteur.
Other objects, features and advantages of the invention will become apparent on reading the following description, given solely by way of nonlimiting example and with reference to the appended drawings in which:
  • FIG. 1 schematically illustrates the general structure of a fuel supply system for an internal combustion engine of a motor vehicle;
  • Figure 2 illustrates another embodiment of the system of Figure 1;
  • Figure 3 and a block diagram illustrating the general structure of the regulating means of the feed system of Figure 1; and
  • FIG. 4 illustrates the mode of regulation of the rotational speed of the motor.

Sur la figure 1, on a représenté un système d'alimentation en carburant selon l'invention, désigné par la référence numérique générale 10. Ce système est destiné à l'alimentation d'un moteur à combustion interne de véhicule automobile.In Figure 1, there is shown a fuel supply system according to the invention, designated by the general numerical reference 10. This system is intended for supplying an internal combustion engine of a motor vehicle.

Ce système comporte essentiellement un réservoir 12 de carburant, assurant l'alimentation d'un dispositif d'injection 14 d'un moteur thermique 16. Le réservoir 12 est muni, intérieurement, d'un bac de rétention de carburant 18 dans lequel est pratiqué un orifice de petite taille 20, c'est-à-dire de taille négligeable par rapport à la surface de fond du bac de rétention 18.This system essentially comprises a tank 12 of fuel, supplying an injection device 14 of a heat engine 16. The tank 12 is internally provided with a fuel retention tank 18 in which is practiced a small orifice 20, that is to say of negligible size relative to the bottom surface of the retention tank 18.

Le réservoir 12 est également pourvu d'une pompe à carburant 22 pilotée par une carte électronique de pilotage 24 extérieure, ou intérieure, au réservoir. Elle assure l'aspiration du carburant à partir du bac de rétention 18. A cet effet, une canalisation 26 raccordée à la pompe à carburant 22 et équipée d'un filtre à carburant 28 plonge dans le bac de rétention 18. Une deuxième canalisation 29 s'étend entre le système d'injection 14 et la pompe 22. Comme visible sur la figure 2, qui est par ailleurs identique à la figure 1 et sur laquelle des éléments identiques à ceux de la figure 1 sont désignés par les mêmes références numériques, la deuxième canalisation peut être équipée d'un filtre à carburant 31 à la place du filtre dans le bac de rétention. Enfin, un régulateur de pression 30 optionnel, disposé en aval de la pompe 22, assure une régulation de la pression de carburant délivré par la pompe de manière à la maintenir à un niveau sensiblement constant. A cet effet, une conduite 32 de retour de carburant est prévue entre le régulateur de pression 30 et le bac de rétention 18 ou, en variante, comme représenté en pointillés, directement dans le reste du réservoir de manière à réinjecter le carburant en excès. Cette conduite permet, par effet Venturi dans le bac 20, de maintenir sensiblement constant le niveau de carburant dans le bac 18.The reservoir 12 is also provided with a fuel pump 22 controlled by an external control electronic card 24, or internal, to the tank. It ensures the aspiration of the fuel from the retention tank 18. For this purpose, a pipe 26 connected to the fuel pump 22 and equipped with a fuel filter 28 dives into the retention tank 18. A second pipe 29 extends between the injection system 14 and the pump 22. As visible in Figure 2, which is otherwise identical to Figure 1 and on which elements identical to those of Figure 1 are designated by the same reference numerals , the second pipe can be equipped with a fuel filter 31 instead of the filter in the retention tank. Finally, an optional pressure regulator 30, disposed downstream of the pump 22, regulates the fuel pressure delivered by the pump so as to maintain it at a substantially constant level. For this purpose, a fuel return line 32 is provided between the pressure regulator 30 and the retention tank 18 or, alternatively, as shown in dotted lines, directly in the rest of the tank in order to reinject the excess fuel. This pipe makes it possible, by Venturi effect in the tank 20, to keep the level of fuel in the tank 18 substantially constant.

La pompe à carburant 22 comprend un moteur électrique 34 piloté par la carte électronique de pilotage 24 et une pompe hydraulique 36 entraînée par le moteur 34.The fuel pump 22 comprises an electric motor 34 controlled by the electronic control card 24 and a hydraulic pump 36 driven by the motor 34.

Dans le but de contrôler la pression de carburant fourni par la pompe 22, le courant d'alimentation du moteur 34 est régulé par la carte de pilotage 24. Cette carte 24 assure le pilotage du moteur électrique 34 de la pompe à carburant uniquement par régulation du courant d'alimentation du moteur, celui-ci étant toujours alimenté par une tension continue, sans utilisation de quelconques capteurs. En d'autre termes, le courant d'alimentation du moteur est régulé autour d'une valeur de consigne apte à obtenir une vitesse de rotation du moteur permettant d'obtenir une pression de courant cible en aval de la pompe, et ce en fonction des caractéristiques de la pompe liant la pression en fonction du débit de carburant. En outre, les caractéristiques de la pompe liant la pression en fonction du débit pouvant varier en fonction du débit de carburant traversant la pompe, la valeur de consigne est élaborée ou adaptée en fonction du débit. A cet effet, la valeur du courant d'alimentation du moteur, qui traduit le débit de carburant traversant la pompe, est utilisée pour corriger la valeur de consigne de courant.In order to control the fuel pressure supplied by the pump 22, the motor supply current 34 is regulated by the control card 24. This card 24 controls the electric motor 34 of the fuel pump only by regulation. the motor supply current, which is always powered by a DC voltage, without the use of any sensors. In other words, the motor supply current is regulated around a set point capable of obtaining a rotational speed of the motor making it possible to obtain a target current pressure downstream of the pump, and this in function characteristics of the pump binding the pressure as a function of the fuel flow. In addition, the characteristics of the pump linking the pressure depending on the flow rate may vary depending on the fuel flow through the pump, the set value is developed or adapted depending on the flow. For this purpose, the value of the motor supply current, which translates the fuel flow through the pump, is used to correct the current setpoint.

On a représenté sur la figure 3 le schéma synoptique de la carte électronique de pilotage 24 permettant d'assurer la régulation de la pompe 22.FIG. 3 shows the block diagram of the electronic control card 24 making it possible to regulate the pump 22.

Comme on le voit que cette figure, cette carte 24 comprend un convertisseur de tension continue 38 recevant, en entrée, une tension d'alimentation Ve délivrée par le réseau de bord R du véhicule et délivrant, en sortie, une tension de sortie Vs d'alimentation du moteur 34 de la pompe 22. Par ailleurs, afin d'assurer la régulation du courant d'alimentation du moteur, cette carte 24 est associée à un organe 40 de mesure du courant d'alimentation du moteur qui traduit, comme indiqué précédemment, la pression du courant en aval de la pompe, selon les caractéristiques de la pompe établissant un niveau de pression en fonction du débit délivré par la pompe. Le courant mesuré délivré par l'organe de mesure 40 est comparé, après filtrage au moyen d'un organe de filtrage 42 approprié, à une valeur de consigne de courant CONS au moyen d'un comparateur 44. L'erreur ainsi calculée est présentée en entrée d'un régulateur 46 puis en entrée d'un étage de pilotage 48 pour élaborer un signal S de pilotage du convertisseur de tension 38.As can be seen in this figure, this card 24 comprises a DC voltage converter 38 receiving, as input, a supply voltage Ve delivered by the vehicle's on-board network R and delivering, as output, an output voltage Vs of supplying the motor 34 of the pump 22. In addition, in order to regulate the motor supply current, this card 24 is associated with a device 40 of measurement of the motor supply current which, as indicated above, reflects the pressure of the current downstream of the pump, according to the characteristics of the pump establishing a pressure level as a function of the flow rate delivered by the pump. The measured current delivered by the measuring member 40 is compared, after filtering by means of an appropriate filtering member 42, with a current reference value CONS by means of a comparator 44. The error thus calculated is presented at the input of a regulator 46 and then at the input of a control stage 48 to produce a control signal S for the voltage converter 38.

Par exemple, le convertisseur de tension 38 comporte un ensemble de cellules de commutation à base de transistors bipolaires, de transistors MOSFET, ...pilotés par modulation en largeur d'impulsion par l'étage de pilotage 48 de manière à obtenir un niveau de courant cible.For example, the voltage converter 38 comprises a set of switching cells based on bipolar transistors, MOSFET transistors, ... driven by pulse width modulation by the control stage 48 so as to obtain a level of target current.

Comme on le voit sur la figure 3, la carte 24 est complétée par un étage 50 de correction adapté pour corriger la consigne de courant en fonction du débit de carburant dans la mesure où, comme indiqué précédemment, les caractéristiques de la pompe liant la pression de carburant en fonction du débit peuvent varier en fonction du débit de carburant traversant la pompe et donc en fonction du courant d'alimentation du moteur 34. Cette correction est également basée sur une mesure du courant délivrée par l'organe de mesure 40.As can be seen in FIG. 3, the card 24 is completed by a correction stage 50 adapted to correct the current setpoint as a function of the fuel flow, insofar as, as indicated above, the characteristics of the pump binding the pressure Depending on the flow of fuel passing through the pump, and depending on the supply current of the motor 34, the fuel consumption depends on the flow rate. This correction is also based on a measurement of the current delivered by the measuring element 40.

L'étage 50 de correction comporte un étage 52 de mesure de la fréquence du courant mesuré raccordé à un étage 54 de conversion de fréquence en vitesse de rotation du moteur. Cette conversion est effectuée selon la relation suivante : Ω = f / 2 p

Figure imgb0001

dans laquelle :

  • Ω désigne la vitesse de rotation du moteur en tours par seconde ;
  • f désigne la fréquence du courant d'alimentation : et
  • p désigne le nombre de paires de pôles du moteur électrique.
The correction stage 50 comprises a stage 52 for measuring the frequency of the measured current connected to a stage 54 for converting frequency into rotational speed of the motor. This conversion is performed according to the following relation: Ω = f / two p
Figure imgb0001
in which :
  • Ω is the speed of rotation of the motor in revolutions per second;
  • f denotes the frequency of the supply current: and
  • p denotes the number of pole pairs of the electric motor.

Ainsi, comme représenté sur la figure 4, après mesure du courant 1 (étape 56), l'étage de détection de fréquence 52 mesure la fréquence f du courant d'alimentation (étape 58). L'étage de conversion 54 procède alors au calcul de la vitesse de rotation du moteur (étape 60).Thus, as shown in FIG. 4, after measurement of the current 1 (step 56), the frequency detection stage 52 measures the frequency f of the supply current (step 58). The conversion stage 54 then calculates the rotation speed of the motor (step 60).

La vitesse de rotation du moteur est alors comparée à une vitesse de référence VIT au moyen d'un comparateur 62. La différence ainsi calculée est alors présentée en entrée d'un correcteur 64 pour insérer dans le résultat de la comparaison entre la mesure de courant filtrée et la consigne de courant, une composante de correction de la consigne de courant en fonction de la vitesse de rotation du moteur. Comme indiqué précédemment, cette compensation permet d'adapter la consigne de courant à la vitesse de rotation du moteur et, en particulier, de s'affranchir ainsi des non-linéarités de la pompe à carburant.The rotational speed of the motor is then compared to a reference speed VIT by means of a comparator 62. The difference thus calculated is then presented at the input of a corrector 64 to insert into the result of the comparison between the current measurement. filtered and the current setpoint, a correction component of the current setpoint as a function of the rotational speed of the motor. As indicated above, this compensation makes it possible to adapt the current setpoint to the speed of rotation of the motor and, in particular, to overcome the non-linearities of the fuel pump.

En fonctionnement, lors du démarrage du moteur thermique, la tension délivrée par la batterie du véhicule, qui est disponible sur le réseau de bord du véhicule, est appliquée à la carte électronique de pilotage. Cette carte procède alors au démarrage du moteur électrique de la pompe et à une régulation du courant d'alimentation de ce moteur autour d'une consigne de courant représentative de la pression nominale de fonctionnement du circuit d' alimentation en carburant.In operation, when starting the heat engine, the voltage delivered by the vehicle battery, which is available on the vehicle's on-board system, is applied to the electronic control card. This card then starts the electric motor of the pump and a regulation of the supply current of this motor around a current setpoint representative of the nominal operating pressure of the fuel supply circuit.

On notera que la valeur de consigne de courant peut être maintenue fixe tout au long de l'application de la tension du réseau de bord et, par conséquent, tant que le véhicule est en fonctionnement.Note that the current setpoint value can be held fixed throughout the application of the voltage of the onboard network and, therefore, as long as the vehicle is in operation.

En variante, il est également possible de faire varier cette consigne et/ou la vitesse de référence utilisée pour l'élaboration de la composante de correction de cette valeur de consigne.Alternatively, it is also possible to vary this setpoint and / or the reference speed used to develop the correction component of this setpoint value.

On notera enfin que le pilotage du moteur électrique de la pompe a été illustré dans une application selon laquelle le moteur est un moteur électrique à courant continu avec balai. Pour un moteur électrique à courant continu sans balai, le même principe de régulation s'applique également. Cependant, dans ce cas, le courant continu est polyphasé et se pilote en fréquence. La vitesse de rotation du moteur électrique peut donc directement être déduite de la fréquence de pilotage. La régulation en courant décrit précédemment s'applique quant à elle en parallèle sur l'ensemble des courants de phase.Finally, it should be noted that the control of the electric motor of the pump has been illustrated in an application according to which the motor is a DC electric motor with brush. For a brushless direct current electric motor, the same control principle applies as well. However, in this case, the direct current is polyphase and frequency-controlled. The rotational speed of the electric motor can therefore be directly deduced from the driving frequency. The current regulation described above applies in turn in parallel to all of the phase currents.

Claims (9)

Système d'alimentation en carburant d'un moteur à combustion interne de véhicule automobile, comprenant un réservoir (12) de carburant, une pompe (36) entraînée par un moteur électrique (34) et des moyens (24) de régulation du courant d'alimentation du moteur, caractérisé en ce qu'il comporte des moyens (40) de mesure du courant d'alimentation du moteur, les moyens de régulation du courant d'alimentation du moteur étant adaptés pour réguler la vitesse de rotation du moteur uniquement en régulant le courant d'alimentation du moteur autour d'une valeur de consigne de courant d'alimentation (CONS) représentative d'un niveau de pression de carburant en aval de la pompe.Fuel supply system for an internal combustion engine of a motor vehicle, comprising a fuel tank (12), a pump (36) driven by an electric motor (34) and means (24) for regulating the flow of fuel. motor supply, characterized in that it comprises means (40) for measuring the motor supply current, the motor power supply regulating means being adapted to regulate the motor rotation speed only in regulating the motor supply current around a supply current setpoint (CONS) representative of a fuel pressure level downstream of the pump. Système selon la revendication 1, caractérisé en ce qu'il comporte des moyens (52, 54, 62, 64) pour calculer la vitesse de rotation du moteur à partir d'une mesure du courant d'alimentation du moteur et pour adapter la valeur de consigne de courant en fonction de la vitesse de rotation du moteur.System according to Claim 1, characterized in that it comprises means (52, 54, 62, 64) for calculating the rotational speed of the engine from a measurement of the motor supply current and for adjusting the value current setpoint as a function of the rotational speed of the motor. Système selon la revendication 2, caractérisé en ce qu'il comporte des moyens (52) de mesure de la fréquence du courant d'alimentation du moteur, des moyens (54) de conversion de la fréquence mesurée en vitesse de rotation du moteur et des moyens (62) de comparaison de la vitesse de rotation du moteur résultant de ladite comparaison avec au moins une valeur de consigne de vitesse de rotation pour adapter la valeur de consigne de courant.System according to claim 2, characterized in that it comprises means (52) for measuring the frequency of the motor supply current, means (54) for converting the measured frequency into the speed of rotation of the motor and the means (62) for comparing the rotational speed of the motor resulting from said comparison with at least one rotational speed reference value to adapt the current reference value. Système selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il comporte en outre un bac de rétention (18) logé à l'intérieur du réservoir, dans lequel se trouve un conduit relié à la pompe et constituant un circuit de retour de carburant en excès pour maintenir un niveau de carburant sensiblement constant dans le bac de rétention.System according to any one of claims 1 to 3, characterized in that it further comprises a retention tank (18) housed inside the tank, in which there is a conduit connected to the pump and constituting a circuit returning excess fuel to maintain a substantially constant fuel level in the holding tank. Système selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le circuit de retour de carburant est équipé d'un filtre de carburant (28).System according to one of Claims 1 to 4, characterized in that the fuel return circuit is equipped with a fuel filter (28). Système selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comporte en outre un filtre de carburant (31) disposé en aval de la pompe.System according to any one of claims 1 to 5, characterized in that it further comprises a fuel filter (31) disposed downstream of the pump. Procédé de régulation de la pression d'alimentation en carburant d'un moteur à combustion interne, selon lequel on régule le courant d'alimentation d'un moteur électrique (34) d'entraînement d'une pompe à carburant, caractérisé en ce que l'on régule la vitesse de rotation du moteur uniquement en régulant le courant d'alimentation du moteur autour d'une valeur de consigne de courant d'alimentation (CONS) représentative d'un niveau de pression de carburant en aval de la pompe.A method of regulating the fuel supply pressure of an internal combustion engine, wherein the supply current of an electric motor (34) for driving a fuel pump is regulated, characterized in that the speed of rotation of the motor is regulated solely by regulating the motor supply current around a supply current setpoint (CONS) representative of a fuel pressure level downstream of the pump. Procédé selon la revendication 7, caractérisé en ce que l'on mesure le courant d'alimentation du moteur, on calcule la vitesse de rotation du moteur à partir de la mesure du courant d'alimentation du moteur et l'on adapte la valeur de consigne de courant en fonction de la vitesse de rotation du moteur.Method according to Claim 7, characterized in that the motor supply current is measured, the motor rotation speed is calculated from the measurement of the motor supply current and the value of the motor power is adjusted. current setpoint as a function of the rotational speed of the motor. Procédé selon la revendication 8, caractérisé en ce que la vitesse de rotation du moteur est calculée par mesure de la fréquence du courant d'alimentation du moteur et conversion de la fréquence mesurée en une vitesse de rotation correspondante.Method according to Claim 8, characterized in that the rotational speed of the motor is calculated by measuring the frequency of the motor supply current and converting the measured frequency into a corresponding rotational speed.
EP05300739A 2004-09-21 2005-09-09 System for supplying an automotive internal combustion engine with fuel and method for regulating the fuel pressure of such an engine Not-in-force EP1637723B1 (en)

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FR0409948A FR2875544B1 (en) 2004-09-21 2004-09-21 FUEL SUPPLY SYSTEM OF A MOTOR VEHICLE INTERNAL COMBUSTION ENGINE AND METHOD OF CONTROLLING THE FUEL SUPPLY PRESSURE OF SUCH ENGINE

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EP1637723B1 (en) 2007-08-22
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ATE371104T1 (en) 2007-09-15
DE602005002102T2 (en) 2008-05-21
FR2875544B1 (en) 2009-05-15

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