EP2683921A1 - Combustion engine lubrication system comprising a variable-displacement oil pump - Google Patents

Combustion engine lubrication system comprising a variable-displacement oil pump

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Publication number
EP2683921A1
EP2683921A1 EP12709918.2A EP12709918A EP2683921A1 EP 2683921 A1 EP2683921 A1 EP 2683921A1 EP 12709918 A EP12709918 A EP 12709918A EP 2683921 A1 EP2683921 A1 EP 2683921A1
Authority
EP
European Patent Office
Prior art keywords
engine
pressure
oil
lubrication system
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12709918.2A
Other languages
German (de)
French (fr)
Inventor
Pascal GALACTEROS
Renaud Dufour
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
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2683921A1 publication Critical patent/EP2683921A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0238—Rotary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0246—Adjustable pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F01M2001/083—Lubricating systems characterised by the provision therein of lubricant jetting means for lubricating cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam

Definitions

  • the present invention relates to a lubrication system of a heat engine, and a motor and a motor vehicle comprising such a lubrication system.
  • the thermal engines generally comprise an oil pump that rotates continuously, to supply pressurized oil to the crankshaft and various moving parts of the engine, in order to lubricate and cool the guide bearings of these elements.
  • Control valves arranged in the oil circuit comprising pressure regulating valves which open under a defined pressure, allow to obtain a certain regulation of the fluid flow supplying the various components.
  • a known type of oil pump presented in particular by the document EP-A1-1537335, comprises a variable displacement regulated by a piston, this displacement adjustment being adjusted according to different operating parameters of the engine, to reduce the mechanical power absorbed by the drive of this pump.
  • Another known method for adjusting the oil flow of the piston cooling nozzles uses a solenoid valve controlled by a control current in order to deliver an oil pressure to these nozzles only if necessary. This method makes it possible to limit the flow of oil delivered by the pump, and to reduce its displacement at certain times in order to reduce the driving torque of the rotor of this pump.
  • a problem with this method is that the engine oil circuit must be modified, and a solenoid valve comprising a power supply must be added, which entails costs.
  • the present invention is intended in particular to avoid these disadvantages of the prior art, and to provide a simple and effective solution allowing cooling the pistons of a heat engine, while reducing the power absorbed by the oil pump.
  • a lubrication system of a heat engine comprising an oil pump realizing different flow rates controlled by a control means comprising a map that according to the pressure and the oil temperature, and the speed of rotation of the engine , determines a target pressure and a flow rate of the pump to obtain it, this system also supplying cooling nozzles for the engine pistons, characterized in that the nozzle supply circuit comprises a regulating valve opening above a pressure threshold, and in that the mapping of the control means further takes into account the load of the engine, which in case of need for cooling of the engine pistons depending on this load, determines a target pressure greater than the threshold pressure of the valve, and the corresponding setting of the pump flow.
  • An advantage of the lubrication system according to the invention is that it is possible with only an additional mechanical valve, if necessary to control a larger flow to obtain a higher pressure, in order to open the valve to obtain engine cooling, and the rest of the time will be satisfied with a lower flow rate depending on the other needs of the engine, in order to reduce the mechanical power absorbed by the pump.
  • control method according to the invention can comprise one or more of the following characteristics, which can be combined with one another.
  • the threshold pressure of the regulating valve is greater than the usual target pressure necessary for an engine at its normal operating temperature.
  • the oil pump has a variable displacement to adjust its flow.
  • variable displacement oil pump may comprise a rotor comprising radial vanes which slide outwards, to bear on the internal surface of a stator.
  • the stator can move to adjust the displacement of the oil pump by means of an oil pressure acting on a piston surface.
  • the oil pressure can be controlled by a solenoid valve controlled by the control means.
  • control means is integrated in the control computer of the heat engine.
  • the subject of the invention is also a heat engine comprising a lubrication system comprising a variable flow oil pump, controlled by a control means having a mapping which, according to the pressure and the oil temperature, and the speed of the engine. rotation of the motor, determines a target pressure and a flow rate of the pump to obtain it, this system also supplying cooling nozzles for the engine pistons, characterized in that the nozzle supply circuit comprises a regulating valve opening above a pressure threshold, which is greater than the usual target pressure required for an engine at its normal operating temperature.
  • the invention also relates to a motor vehicle having a heat engine comprising a lubrication system, which comprises any one of the preceding features.
  • Figure 1 shows a heat engine 1 comprising a motor unit 2 receiving the cylinders, below which is an oil sump 4 containing the lubricating oil.
  • An oil pump 6 which is variable displacement, sucks by a suction screen 8 the oil contained in the housing 4.
  • the pressurized oil then passes into an oil filter 10 to be purified, then is distributed in various pipes.
  • a first pipe 12 supplies the engine block
  • a second pipe 16 feeds the cylinder head 18, to lubricate the bearings of the camshaft and the thrusters of the valves.
  • a control computer 20 of the oil pump 6 controls by an actuator the adjustment of the displacement of this pump.
  • the control computer 20 of the oil pump 6 is integrated in the control computer of the engine 1 which controls the ignition and fuel injection of the engine, which reduces costs.
  • the variable displacement oil pump 6 may comprise in particular a rotor comprising radial vanes which slide outwardly to bear on the cylindrical inner surface of a circular stator, comprising an axis offset from that of the rotor so as to obtain on a revolution of this rotor, a variation of the volume of each chamber located between two pallets.
  • a simple means of controlling the displacement of the pump is to move the stator to move away or closer to its center of the axis of the rotor, so as to respectively increase or reduce the displacement.
  • the adjustment of the oil pump 6 can be carried out according to various known methods, for example by the control by means of a solenoid valve, an oil pressure acting in a chamber or on a piston control, to move the stator and reduce the displacement.
  • the control computer 20 of the oil pump 6 comprises, in a known manner, a mapping which, according to the actual pressure and the oil temperature, and the rotation speed of the motor measured permanently, determines a target pressure as well as a pump flow to get it.
  • control computer 20 regulates, by its actuator, the displacement of the pump 6 so as to reach this target pressure, by increasing or reducing this displacement in the case where the pressure is respectively too weak or too strong.
  • the opening threshold pressure of the valve 22 is greater than the usual target pressure necessary for an engine at its normal operating temperature, so as to leave this valve closed and do not cool the pistons unnecessarily, which makes it possible to obtain a rather high temperature favoring a better combustion.
  • the method according to the invention implemented by the control computer 20, also takes into account information on the engine load delivered by the engine computer, to establish a need for additional cooling of the pistons in case of heavy load.
  • the displacement of the pump 6 may remain lower so as to maintain a lower pressure which allows the regulating valve 22 to close.
  • the lower cylinder capacity and the absence of loss of a volume of oil through the cooling nozzles 26, allow to limit the driving torque of the pump 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

Combustion engine lubrication system comprising an oil pump (6) that can achieve different deliveries controlled by a control means (20) comprising a map which, depending on the oil temperature and pressure, and on the engine speed, determines a target pressure and delivery for the pump in order to achieve this, this system also feeding oil to the engine piston cooling nozzles (26), characterized in that the supply circuit (24) for the nozzles (26) comprises a regulating valve (22) which opens when the pressure is above a threshold, and in that the map belonging to the control means (20) also takes engine load into account and if, on the basis of this load, the engine pistons need cooling, determines a target pressure higher than the threshold pressure of the valve (22) and makes a corresponding adjustment to the delivery of the pump (6).

Description

SYSTEME DE LUBRIFICATION D ' UN MOTEUR THERMIQUE , COMPRENANT UNE POMPE A HUILE A CYLINDREE VARIABLE  HEAT ENGINE LUBRICATING SYSTEM, COMPRISING A VARIABLE CYLINDER OIL PUMP
La présente invention revendique la priorité de la demande française 1151971 déposée le 10 mars 2011 dont le contenu (texte, dessins et revendications) est ici incorporé par référence. The present invention claims the priority of the French application 1151971 filed March 10, 2011 whose content (text, drawings and claims) is here incorporated by reference.
La présente invention concerne un système de lubrification d'un moteur thermique, ainsi qu'un moteur et un véhicule automobile comportant un tel système de lubrification .  The present invention relates to a lubrication system of a heat engine, and a motor and a motor vehicle comprising such a lubrication system.
Les moteurs thermiques comportent généralement une pompe à huile qui tourne en permanence, pour alimenter en huile sous pression le vilebrequin ainsi que différents éléments en mouvement de ce moteur, afin de lubrifier et refroidir les paliers de guidage de ces éléments. Des valves de contrôle disposées dans le circuit d'huile, comprenant des clapets de régulation de pression qui s'ouvrent sous une pression définie, permettent d'obtenir une certaine régulation du débit de fluide alimentant les différents composants.  The thermal engines generally comprise an oil pump that rotates continuously, to supply pressurized oil to the crankshaft and various moving parts of the engine, in order to lubricate and cool the guide bearings of these elements. Control valves arranged in the oil circuit, comprising pressure regulating valves which open under a defined pressure, allow to obtain a certain regulation of the fluid flow supplying the various components.
Un type de pompe à huile connu, présenté notamment par le document EP-A1-1537335, comporte une cylindrée variable réglée par un piston, ce réglage de cylindrée étant ajusté en fonction de différents paramètres de fonctionnement du moteur thermique, pour réduire la puissance mécanique absorbée par l'entraînement de cette pompe .  A known type of oil pump, presented in particular by the document EP-A1-1537335, comprises a variable displacement regulated by a piston, this displacement adjustment being adjusted according to different operating parameters of the engine, to reduce the mechanical power absorbed by the drive of this pump.
Il est par ailleurs connu, comme présenté par le document US-B2-7823545, de disposer en dessous de chaque piston du moteur thermique, un gicleur alimenté en huile sous pression par la pompe à huile à cylindrée variable de ce moteur, pour envoyer un jet d'huile sous la tête du piston afin de le refroidir, et éviter une surchauffe en cas de forte demande de puissance. Pour ce moteur, dans le cas d'une rotation à faible vitesse générant un débit d'huile de la pompe qui est plus petit, on augmente la cylindrée de cette pompe afin d'obtenir un débit plus important permettant d'alimenter en huile sous pression les gicleurs par un circuit direct ne comprenant pas de clapet de régulation de pression. It is also known, as presented by the document US-B2-7823545, to have below each piston of the engine, a nozzle supplied with oil under pressure by the variable displacement oil pump of this engine, to send a oil jet under the piston head to cool, and avoid overheating in case of high power demand. For this engine, in the case of a low speed rotation generating a pump oil flow which is smaller, the cubic capacity of this pump is increased in order to obtain a greater flow rate enabling the supply of oil under the engine. pressure the nozzles by a direct circuit that does not include a pressure regulating valve.
D'autres types de circuits de pression d'huile connus, comportent des clapets de régulation de pression sur le circuit des gicleurs de refroidissement, s 'ouvrant au dessus d'un seuil de pression.  Other types of known oil pressure circuits include pressure regulating valves on the cooling jet circuit, opening above a pressure threshold.
Toutefois il est difficile d'obtenir à la fois par des moyens mécaniques simples, quand le moteur qui délivre une forte puissance est chaud avec une huile plus fluide entraînant généralement une baisse de pression, une pression d'huile suffisante pour ouvrir les clapets d'alimentation des gicleurs, et quand le moteur qui délivre une faible puissance est froid avec une huile moins fluide entraînant généralement une augmentation de pression, une pression d'huile pas trop forte pour maintenir les clapets fermés.  However, it is difficult to obtain both by simple mechanical means, when the engine that delivers a high power is hot with a more fluid oil generally causing a drop in pressure, sufficient oil pressure to open the valves. nozzle supply, and when the engine that delivers a low power is cold with a less fluid oil generally causing an increase in pressure, oil pressure not too high to maintain the valves closed.
Un autre procédé connu pour régler le débit d'huile des gicleurs de refroidissement des pistons, utilise une électrovanne pilotée par un courant de commande afin de délivrer une pression d'huile à ces gicleurs uniquement en cas de besoin. Ce procédé permet de limiter le flux d'huile délivré par la pompe, et de réduire sa cylindrée à certains moments afin de diminuer le couple d'entraînement du rotor de cette pompe.  Another known method for adjusting the oil flow of the piston cooling nozzles, uses a solenoid valve controlled by a control current in order to deliver an oil pressure to these nozzles only if necessary. This method makes it possible to limit the flow of oil delivered by the pump, and to reduce its displacement at certain times in order to reduce the driving torque of the rotor of this pump.
Un problème qui se pose avec ce procédé, est qu'il faut modifier le circuit d'huile du moteur, et ajouter une électrovanne comprenant une alimentation électrique, ce qui entraîne des coûts.  A problem with this method is that the engine oil circuit must be modified, and a solenoid valve comprising a power supply must be added, which entails costs.
La présente invention a notamment pour but d'éviter ces inconvénients de la technique antérieure, et d'apporter une solution simple et efficace permettant de réaliser un refroidissement des pistons d'un moteur thermique, tout en réduisant la puissance absorbée par la pompe à huile. The present invention is intended in particular to avoid these disadvantages of the prior art, and to provide a simple and effective solution allowing cooling the pistons of a heat engine, while reducing the power absorbed by the oil pump.
Elle propose à cet effet un système de lubrification d'un moteur thermique, comprenant une pompe à huile réalisant différents débits commandés par un moyen de contrôle comportant une cartographie qui suivant la pression et la température d'huile, et la vitesse de rotation du moteur, détermine une pression cible ainsi qu'un débit de la pompe pour l'obtenir, ce système alimentant de plus des gicleurs de refroidissement des pistons du moteur, caractérisé en ce que le circuit d'alimentation des gicleurs comporte un clapet de régulation s 'ouvrant au dessus d'un seuil de pression, et en ce que la cartographie du moyen de contrôle prend en compte de plus la charge du moteur, qui en cas de besoin de refroidissement des pistons du moteur dépendant de cette charge, détermine une pression cible supérieure à la pression de seuil du clapet, et le réglage correspondant du débit de la pompe.  It proposes for this purpose a lubrication system of a heat engine, comprising an oil pump realizing different flow rates controlled by a control means comprising a map that according to the pressure and the oil temperature, and the speed of rotation of the engine , determines a target pressure and a flow rate of the pump to obtain it, this system also supplying cooling nozzles for the engine pistons, characterized in that the nozzle supply circuit comprises a regulating valve opening above a pressure threshold, and in that the mapping of the control means further takes into account the load of the engine, which in case of need for cooling of the engine pistons depending on this load, determines a target pressure greater than the threshold pressure of the valve, and the corresponding setting of the pump flow.
Un avantage du système de lubrification selon l'invention, est que l'on peut avec seulement un clapet mécanique supplémentaire, commander si nécessaire un débit plus important pour obtenir une pression plus élevée, afin d'ouvrir le clapet pour obtenir un refroidissement moteur, et le reste du temps se contenter d'un débit plus faible en fonction des autres besoins du moteur, afin de réduire la puissance mécanique absorbée par la pompe.  An advantage of the lubrication system according to the invention is that it is possible with only an additional mechanical valve, if necessary to control a larger flow to obtain a higher pressure, in order to open the valve to obtain engine cooling, and the rest of the time will be satisfied with a lower flow rate depending on the other needs of the engine, in order to reduce the mechanical power absorbed by the pump.
De plus le procédé de contrôle selon l'invention peut comporter une ou plusieurs des caractéristiques suivantes, qui peuvent être combinées entre elles.  In addition, the control method according to the invention can comprise one or more of the following characteristics, which can be combined with one another.
Avantageusement, la pression de seuil du clapet de régulation est supérieure à la pression cible habituelle nécessaire pour un moteur à sa température normale de fonctionnement . Advantageously, the threshold pressure of the regulating valve is greater than the usual target pressure necessary for an engine at its normal operating temperature.
Selon un mode de réalisation, la pompe à huile comporte une cylindrée variable pour régler son débit.  According to one embodiment, the oil pump has a variable displacement to adjust its flow.
La pompe à huile à cylindrée variable peut comporter un rotor comprenant des palettes radiales qui coulissent vers l'extérieur, pour venir en appui sur la surface interne d'un stator.  The variable displacement oil pump may comprise a rotor comprising radial vanes which slide outwards, to bear on the internal surface of a stator.
Le stator peut se déplacer pour régler la cylindrée de la pompe à huile, au moyen d'une pression d'huile agissant sur une surface formant un piston.  The stator can move to adjust the displacement of the oil pump by means of an oil pressure acting on a piston surface.
La pression d'huile peut être commandée par une électrovanne pilotée par le moyen de contrôle.  The oil pressure can be controlled by a solenoid valve controlled by the control means.
Avantageusement, le moyen de contrôle est intégré dans le calculateur de contrôle du moteur thermique.  Advantageously, the control means is integrated in the control computer of the heat engine.
L'invention a aussi pour objet un moteur thermique comportant un système de lubrification comprenant une pompe à huile à débit variable, commandée par un moyen de contrôle disposant d'une cartographie qui suivant la pression et la température d'huile, et la vitesse de rotation du moteur, détermine une pression cible ainsi qu'un débit de la pompe pour l'obtenir, ce système alimentant de plus des gicleurs de refroidissement des pistons du moteur, caractérisé en ce le circuit d'alimentation des gicleurs comporte un clapet de régulation s 'ouvrant au dessus d'un seuil de pression, qui est supérieur à la pression cible habituelle nécessaire pour un moteur à sa température normale de fonctionnement .  The subject of the invention is also a heat engine comprising a lubrication system comprising a variable flow oil pump, controlled by a control means having a mapping which, according to the pressure and the oil temperature, and the speed of the engine. rotation of the motor, determines a target pressure and a flow rate of the pump to obtain it, this system also supplying cooling nozzles for the engine pistons, characterized in that the nozzle supply circuit comprises a regulating valve opening above a pressure threshold, which is greater than the usual target pressure required for an engine at its normal operating temperature.
L'invention a aussi pour objet un véhicule automobile disposant d'un moteur thermique comprenant un système de lubrification, qui comporte l'une quelconque des caractéristiques précédentes.  The invention also relates to a motor vehicle having a heat engine comprising a lubrication system, which comprises any one of the preceding features.
L'invention sera mieux comprise et d'autres caractéristiques et avantages apparaîtront plus clairement à la lecture de la description ci-après donnée à titre d'exemple et de manière non limitative, en référence à la figure 1 annexée qui est un schéma d'un circuit d'huile d'un système de lubrification selon l'invention, équipant un moteur thermique. The invention will be better understood and other features and advantages will become more apparent clearly on reading the following description given by way of example and without limitation, with reference to Figure 1 attached which is a diagram of an oil circuit of a lubrication system according to the invention , equipping a heat engine.
La figure 1 présente un moteur thermique 1 comprenant un bloc moteur 2 recevant les cylindres, en dessous duquel se trouve un carter d'huile 4 contenant l'huile de lubrification .  Figure 1 shows a heat engine 1 comprising a motor unit 2 receiving the cylinders, below which is an oil sump 4 containing the lubricating oil.
Une pompe à huile 6 qui est à cylindrée variable, aspire par un tamis d'aspiration 8 l'huile contenue dans le carter 4. L'huile sous pression passe ensuite dans un filtre à huile 10 pour être purifiée, puis est distribuée dans divers canalisations.  An oil pump 6 which is variable displacement, sucks by a suction screen 8 the oil contained in the housing 4. The pressurized oil then passes into an oil filter 10 to be purified, then is distributed in various pipes.
Une première canalisation 12 alimente le bloc moteur A first pipe 12 supplies the engine block
2, pour lubrifier les paliers du vilebrequin et les bielles, ainsi qu'un turbocompresseur d'air 14 dans le cas d'un moteur suralimenté. 2, for lubricating the bearings of the crankshaft and the connecting rods, and an air turbocharger 14 in the case of a supercharged engine.
Une deuxième canalisation 16 alimente la culasse 18, pour lubrifier les paliers de l'arbre à cames ainsi que les poussoirs des soupapes.  A second pipe 16 feeds the cylinder head 18, to lubricate the bearings of the camshaft and the thrusters of the valves.
Une troisième canalisation 24 recevant l'huile sous pression par un clapet de régulation 22 comprenant un ressort de tarage, qui ne s'ouvre qu'à partir d'un seuil de pression, alimente quatre gicleurs 24 qui injectent l'huile sous les têtes de chaque piston, pour les refroidir .  A third pipe 24 receiving the oil under pressure by a regulating valve 22 comprising a setting spring, which opens only from a pressure threshold, supplies four nozzles 24 which inject the oil under the heads. each piston, to cool them.
Un calculateur de pilotage 20 de la pompe à huile 6, commande par un actionneur le réglage de la cylindrée de cette pompe. Avantageusement, le calculateur de pilotage 20 de la pompe à huile 6 est intégré dans le calculateur de contrôle du moteur 1 qui pilote l'allumage et l'injection de carburant de ce moteur, ce qui permet de réduire les coûts. La pompe à huile 6 à cylindrée variable, peut comporter en particulier un rotor comprenant des palettes radiales qui coulissent vers l'extérieur pour venir en appui sur la surface interne cylindrique d'un stator circulaire, comprenant un axe décalé par rapport à celui du rotor de manière à obtenir sur un tour de ce rotor, une variation du volume de chaque chambre située entre deux palettes. A control computer 20 of the oil pump 6 controls by an actuator the adjustment of the displacement of this pump. Advantageously, the control computer 20 of the oil pump 6 is integrated in the control computer of the engine 1 which controls the ignition and fuel injection of the engine, which reduces costs. The variable displacement oil pump 6 may comprise in particular a rotor comprising radial vanes which slide outwardly to bear on the cylindrical inner surface of a circular stator, comprising an axis offset from that of the rotor so as to obtain on a revolution of this rotor, a variation of the volume of each chamber located between two pallets.
Pour cette pompe à palettes 6, un moyen simple de contrôle de la cylindrée de la pompe, consiste à déplacer le stator pour éloigner ou rapprocher son centre de l'axe du rotor, de manière à respectivement augmenter ou réduire la cylindrée.  For this vane pump 6, a simple means of controlling the displacement of the pump, is to move the stator to move away or closer to its center of the axis of the rotor, so as to respectively increase or reduce the displacement.
D'une manière générale, le réglage de la pompe à huile 6 peut s'effectuer suivant différents procédés connus, par exemple par le contrôle au moyen d'une électrovanne, d'une pression d'huile agissant dans une chambre ou sur un piston de commande, pour déplacer le stator et réduire la cylindrée.  In general, the adjustment of the oil pump 6 can be carried out according to various known methods, for example by the control by means of a solenoid valve, an oil pressure acting in a chamber or on a piston control, to move the stator and reduce the displacement.
Le calculateur de pilotage 20 de la pompe à huile 6, comporte de manière connue une cartographie qui suivant la pression réelle et la température d'huile, et la vitesse de rotation du moteur mesurées de manière permanente, détermine une pression cible ainsi qu'un débit de la pompe pour l'obtenir.  The control computer 20 of the oil pump 6 comprises, in a known manner, a mapping which, according to the actual pressure and the oil temperature, and the rotation speed of the motor measured permanently, determines a target pressure as well as a pump flow to get it.
Ensuite pour ajuster la pression délivrée en fonction de la pression cible, le calculateur de pilotage 20 règle par son actionneur la cylindrée de la pompe 6 de manière à atteindre cette pression cible, en augmentant ou en réduisant cette cylindrée dans le cas où la pression est respectivement trop faible ou trop forte.  Then, in order to adjust the pressure delivered as a function of the target pressure, the control computer 20 regulates, by its actuator, the displacement of the pump 6 so as to reach this target pressure, by increasing or reducing this displacement in the case where the pressure is respectively too weak or too strong.
Avantageusement, la pression de seuil d'ouverture du clapet 22 est supérieure à la pression cible habituelle nécessaire pour un moteur à sa température normale de fonctionnement, de manière à laisser ce clapet fermé et ne pas refroidir inutilement les pistons, ce qui permet d'obtenir une température assez élevée favorisant une meilleure combustion. Advantageously, the opening threshold pressure of the valve 22 is greater than the usual target pressure necessary for an engine at its normal operating temperature, so as to leave this valve closed and do not cool the pistons unnecessarily, which makes it possible to obtain a rather high temperature favoring a better combustion.
Le procédé suivant l'invention mis en œuvre par le calculateur de pilotage 20, prend de plus en compte une information sur la charge moteur délivrée par le calculateur moteur, pour établir une nécessité de refroidissement supplémentaire des pistons en cas de forte charge.  The method according to the invention implemented by the control computer 20, also takes into account information on the engine load delivered by the engine computer, to establish a need for additional cooling of the pistons in case of heavy load.
Dans le cas de fonctionnement où la pression d'huile délivrée par la pompe 6 est inférieure au seuil d'ouverture du clapet de régulation 22, le procédé demande alors une augmentation de la cylindrée de cette pompe, pour délivrer une pression supérieure à ce seuil d'ouverture. On obtient alors dans ce cas précis où il y a un besoin spécial de refroidissement des pistons, les jets d'huile envoyés par les gicleurs 26.  In the case of operation where the oil pressure delivered by the pump 6 is lower than the opening threshold of the regulation valve 22, the process then requires an increase in the displacement of this pump, to deliver a pressure above this threshold opening. In this case, where there is a special need for cooling the pistons, the oil jets sent by the nozzles 26 are obtained.
Dans les autres cas, la cylindrée de la pompe 6 peut rester inférieure de manière à maintenir une pression plus basse qui laisse fermer le clapet de régulation 22. Dans ces cas, la cylindrée inférieure ainsi que l'absence de perte d'un volume d'huile par les gicleurs de refroidissement 26, permettent de limiter le couple d'entraînement de la pompe 6.  In other cases, the displacement of the pump 6 may remain lower so as to maintain a lower pressure which allows the regulating valve 22 to close. In these cases, the lower cylinder capacity and the absence of loss of a volume of oil through the cooling nozzles 26, allow to limit the driving torque of the pump 6.
On obtient ainsi sur un moteur 1 comprenant déjà une pompe à huile 6 à cylindrée variable pilotée par un calculateur de pilotage 20, en disposant seulement un clapet de régulation 22 de pression d'huile simple et économique, et sans ajouter de composant nécessitant un câblage électrique, comme une électrovanne, une optimisation de la combustion ainsi qu'une diminution de la puissance mécanique absorbée par cette pompe, qui contribuent à réduire les émissions de gaz polluants.  This results in a motor 1 already comprising a variable displacement oil pump 6 controlled by a control computer 20, by disposing only a simple and economical oil pressure regulating valve 22 and without adding a component requiring wiring. electrical, such as a solenoid valve, combustion optimization and a reduction in the mechanical power absorbed by this pump, which contribute to reducing the emissions of gaseous pollutants.

Claims

REVENDICATIONS
1 - Système de lubrification d'un moteur thermique, comprenant une pompe à huile (6) réalisant différents débits commandés par un moyen de contrôle (20) comportant une cartographie qui suivant la pression et la température d'huile, et la vitesse de rotation du moteur, détermine une pression cible ainsi qu'un débit de la pompe pour l'obtenir, ce système alimentant de plus des gicleurs de refroidissement (26) des pistons du moteur, caractérisé en ce que le circuit d'alimentation (24) des gicleurs (26) comporte un clapet de régulation (22) s 'ouvrant au dessus d'un seuil de pression, et en ce que la cartographie du moyen de contrôle (20) prend en compte de plus la charge du moteur, qui en cas de besoin de refroidissement des pistons du moteur dépendant de cette charge, détermine une pression cible supérieure à la pression de seuil du clapet (22), et le réglage correspondant du débit de la pompe (6) . 1 - A system for lubricating a heat engine, comprising an oil pump (6) producing different flow rates controlled by a control means (20) having a map which, according to the pressure and the oil temperature, and the speed of rotation of the engine, determines a target pressure and a flow rate of the pump to obtain it, this system also supplying cooling nozzles (26) for the piston of the engine, characterized in that the supply circuit (24) of the nozzle (26) comprises a regulating valve (22) opening above a pressure threshold, and in that the mapping of the control means (20) additionally takes into account the load of the engine, which in case the need for cooling the engine pistons depending on this load, determines a target pressure greater than the threshold pressure of the valve (22), and the corresponding setting of the flow rate of the pump (6).
2 - Système de lubrification selon la revendication 2 - Lubrication system according to claim
1, caractérisé en ce que la pression de seuil du clapet de régulation (22) est supérieure à la pression cible habituelle nécessaire pour un moteur à sa température normale de fonctionnement. 1, characterized in that the threshold pressure of the regulating valve (22) is greater than the usual target pressure necessary for an engine at its normal operating temperature.
3 - Système de lubrification selon la revendication 1 ou 2, caractérisé en ce que la pompe à huile (6) comporte une cylindrée variable pour régler son débit.  3 - lubrication system according to claim 1 or 2, characterized in that the oil pump (6) has a variable displacement to adjust its flow.
4 - Système de lubrification selon la revendication 4 - Lubrication system according to claim
3, caractérisé en ce que la pompe à huile (6) à cylindrée variable comporte un rotor comprenant des palettes radiales qui coulissent vers l'extérieur, pour venir en appui sur la surface interne d'un stator. 3, characterized in that the variable displacement oil pump (6) comprises a rotor comprising radial vanes which slide outwards, to bear on the internal surface of a stator.
5 - Système de lubrification selon la revendication 5 - Lubrication system according to claim
4, caractérisé en ce que le stator peut se déplacer pour régler la cylindrée de la pompe à huile (6), au moyen d'une pression d'huile agissant sur une surface formant un piston. 4, characterized in that the stator can move to adjust the displacement of the oil pump (6), by means of an oil pressure acting on a surface forming a piston.
6 - Système de lubrification selon la revendication 5, caractérisé en ce que la pression d'huile est commandée par une électrovanne pilotée par le moyen de contrôle (20).  6 - Lubrication system according to claim 5, characterized in that the oil pressure is controlled by a solenoid valve controlled by the control means (20).
7 - Système de lubrification selon l'une quelconque des revendications précédentes, caractérisé en ce que le moyen de contrôle (20) est intégré dans le calculateur de contrôle du moteur thermique (1) .  7 - lubrication system according to any one of the preceding claims, characterized in that the control means (20) is integrated in the control computer of the engine (1).
8 - Moteur thermique (1) comportant un système de lubrification comprenant une pompe à huile à débit variable (6), commandée par un moyen de contrôle (20) disposant d'une cartographie qui suivant la pression et la température d'huile, et la vitesse de rotation du moteur, détermine une pression cible ainsi qu'un débit de la pompe pour l'obtenir, ce système alimentant de plus des gicleurs de refroidissement (26) des pistons du moteur, caractérisé en ce le circuit d'alimentation (24) des gicleurs (26) comporte un clapet de régulation (22) s 'ouvrant au dessus d'un seuil de pression, qui est supérieur à la pression cible habituelle nécessaire pour un moteur à sa température normale de fonctionnement.  8 - A heat engine (1) comprising a lubrication system comprising a variable-rate oil pump (6), controlled by a control means (20) having a map which according to the pressure and the oil temperature, and the rotational speed of the engine, determines a target pressure and a flow rate of the pump to obtain it, this system also supplying cooling nozzles (26) for the engine pistons, characterized in that the supply circuit ( 24) of the nozzles (26) comprises a regulating valve (22) opening above a pressure threshold, which is greater than the usual target pressure required for an engine at its normal operating temperature.
9 - Véhicule automobile disposant d'un moteur thermique (1) comprenant un système de lubrification, caractérisé en ce que ce système de lubrification est réalisé selon l'une quelconque des revendications 1 à 7.  9 - A motor vehicle having a heat engine (1) comprising a lubrication system, characterized in that said lubrication system is made according to any one of claims 1 to 7.
EP12709918.2A 2011-03-10 2012-02-16 Combustion engine lubrication system comprising a variable-displacement oil pump Withdrawn EP2683921A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1151971A FR2972488B1 (en) 2011-03-10 2011-03-10 THERMAL ENGINE LUBRICATING SYSTEM COMPRISING A VARIABLE CYLINDER OIL PUMP
PCT/FR2012/050335 WO2012120213A1 (en) 2011-03-10 2012-02-16 Combustion engine lubrication system comprising a variable-displacement oil pump

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EP2683921A1 true EP2683921A1 (en) 2014-01-15

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FR (1) FR2972488B1 (en)
WO (1) WO2012120213A1 (en)

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FR2972488B1 (en) 2013-03-29
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