EP3134637B1 - Circuit for reaspirating blow-by gas for an internal combustion engine, notably petrol engine - Google Patents

Circuit for reaspirating blow-by gas for an internal combustion engine, notably petrol engine Download PDF

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Publication number
EP3134637B1
EP3134637B1 EP15714558.2A EP15714558A EP3134637B1 EP 3134637 B1 EP3134637 B1 EP 3134637B1 EP 15714558 A EP15714558 A EP 15714558A EP 3134637 B1 EP3134637 B1 EP 3134637B1
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EP
European Patent Office
Prior art keywords
circuit
main pipe
pipe
reaspiration
coupling
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EP15714558.2A
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German (de)
French (fr)
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EP3134637A1 (en
Inventor
Franck Alizon
Emilie CARTIER
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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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/02—Crankcase ventilating or breathing by means of additional source of positive or negative pressure
    • F01M13/021—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure
    • F01M13/022—Crankcase ventilating or breathing by means of additional source of positive or negative pressure of negative pressure using engine inlet suction
    • 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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/0011—Breather valves
    • F01M2013/0027—Breather valves with a de-icing or defrosting system
    • 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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M2013/0038—Layout of crankcase breathing systems
    • F01M2013/0044—Layout of crankcase breathing systems with one or more valves

Definitions

  • the invention relates to a blow-by gas suction circuit connection for an internal combustion engine, in particular a gasoline engine, as well as a corresponding rebreathing circuit and motor.
  • Blow-off gases also known as crankcase gases
  • crankcase gases come mainly from leaks in the segmentation of modern internal combustion engines. These gases, once in the crankcase, are loaded with oil, and become a source of inconvenience, or even risk for the engine. Indeed, they participate in oil consumption, generate a crankcase pressure and cause degradation of the catalytic system, so a source of pollution. It is therefore necessary to evacuate them. Due to antipollution standards, the blow by gases are no longer released directly into the atmosphere, but are re-injected into the engine air intake via a so-called rebreathing circuit. Before their introduction to the air intake, they undergo a treatment, for example in a decanter or de-oiler baffles, to remove most of the oil they contain.
  • WO2013 / 065112A1 discloses a blow-by gas recirculation circuit of an internal combustion engine provided with a coupling.
  • the pressure drop of the branches of re-aspiration by arranging nozzles, in other words internal section restrictions, on the branches In order to guarantee a predetermined casing pressure, for example between 0 mbar and -50mbar, the pressure drop of the branches of re-aspiration by arranging nozzles, in other words internal section restrictions, on the branches.
  • the nozzle of the upper branch has a section of the order of 5 to 6.5 mm in diameter.
  • That of the lower branch has a section of the order of 1.5 to 1.8 mm in diameter because the depressions involved are more important (they can reach -800mbar).
  • the orifice of predetermined section which forms a nozzle, is thus offset in a portion of the connector which is swept by the flow of gas flowing inside the connection regardless of the path followed by this gas flow.
  • the outer walls of the pipe, and in particular the predetermined section orifice are in the gas flow.
  • these gases are hot, thus warms this orifice of predetermined section, avoiding icing.
  • the flow of gas also circulates inside the inner pipe through the predetermined section orifice, which is then heated by the heat of this gas flow.
  • the connection according to the invention thus makes it possible to avoid, in a simple and inexpensive manner, icing at the orifice of predetermined section when the external temperature is low.
  • the first secondary pipe may extend in the extension of the main pipe. This makes it easier to make the coupling and to facilitate the flow of a gas inside the fitting.
  • the first secondary pipe and the main pipe may be rectilinear and extend in the extension of one another.
  • the main and secondary pipes of the coupling may advantageously be cylindrical, as well as the inner pipe, which may advantageously be coaxial with the main pipe and the first secondary pipe.
  • one end of the inner tubing is attached to the inside of the first secondary pipe, the remainder of the inner tubing extending over part or the entire length of the main pipe, even protrude from it on the side of its free end.
  • the predetermined section orifice may be disposed inside the main pipe at the bifurcation. Only the free end of the inner tubing is then disposed inside the main pipe. This can make it possible to limit the pressure drops in the main pipe due to the presence of the internal tubing, while ensuring a sufficient gas flow on the orifice of predetermined section to prevent icing at this orifice.
  • the orifice of predetermined section may be disposed inside the main pipe opposite the second secondary pipe, namely opposite the opening of the second secondary pipe opening into the main pipe.
  • this orifice may be located "opposite" the second secondary pipe when it is located in an area corresponding to the projection of the opening in a direction perpendicular to an axis of the main pipe, or in a zone corresponding to extending the second secondary pipe inside the main pipe or between these two zones.
  • the orifice of predetermined section may for example be disposed inside the main pipe in the extension of a wall of the second secondary pipe, in particular in the extension a wall of the second secondary pipe adjacent to the first secondary pipe.
  • connection according to the invention can be made of polymer material. It can then be made in one piece, for example by injection molding, which reduces its manufacturing time and cost.
  • the polymeric material may be a polyamide, for example filled with fiberglass or any other suitable polymeric material.
  • connection according to the invention could also be made in several parts assembled together.
  • the invention also relates to an internal combustion engine, in particular a gasoline engine, comprising an air intake circuit equipped with a regulation valve and a blow-by gas re-aspiration circuit according to the invention, in which the first branch of said re-suction circuit is connected to the air intake circuit downstream of the control valve with respect to the flow direction of the intake air in the air intake circuit, the second branch of said circuit of re-aspiration being connected to the air intake circuit upstream of the regulating valve.
  • the first branch of the rebreathing circuit thus forms the so-called "low” branch mentioned above, the second branch of the re-aspiration circuit forming the so-called "high” branch.
  • connection according to the invention As the gases leaving the oil separation device are hot, the positioning of the connection according to the invention downstream of this separation device and its attachment directly to this separation device ensure a flow of hot gas inside the connection according to the invention. the invention, reducing the risk of icing of the predetermined section orifice, namely the nozzle, of the lower branch.
  • the invention finally relates to a motor vehicle comprising an internal combustion engine as described above.
  • upstream and downstream are to be understood in relation to the direction of circulation of the fluids (in particular the intake air and the blow by gases) in the pipes.
  • the figure 1 is a schematic representation of a gasoline internal combustion engine 10, of which only one of the cylinders 11 is shown.
  • the cylinder 11 draws air through an air intake circuit 12 which comprises an air flow control valve 13, usually a butterfly valve, often called “throttle body". Upstream of the regulating valve 13 with respect to the direction of air circulation, an air filter 14 makes it possible to eliminate the impurities possibly present in the air flow before it is admitted into the cylinder.
  • the arrows symbolize the circulation of fluids.
  • the first branch 23 makes it possible to evacuate the blow-by gases downstream of the control valve 13 when the motor 10 is operating at a vacuum or in a very partial load.
  • the second branch 24 makes it possible to evacuate the blow-by gases upstream of the control valve 13 when the engine 10 is operating at full load.
  • the oil separating device 21 is for example a decanter.
  • a connector 30 makes it possible to connect the oil separator device 21 to each of the first and second branches 23, 24 respectively of the blow-by gas purge circuit 20. This connector 30 is described in more detail with reference to Figures 2 to 4 .
  • the fitting 30 is formed of a main pipe 31 dividing at a bifurcation 32 into a first secondary pipe 33 and a second secondary pipe 34.
  • the coupling 30 has a generally T-shaped or Y-shaped shape.
  • the first secondary pipe 33 extends in the extension of the main pipe 31, these two pipes 31, 33 being rectilinear.
  • the connector 30 is connected by the free end 31a of the main pipe 31 to the oil separating device 21. It is connected to the first and second branches 23, 24 respectively by the free ends 33a, 34a of the first secondary pipe 33 and the second secondary pipe 34, respectively.
  • the connector 30 comprises an internal tubing 35 in fluid communication with the first secondary pipe 33.
  • one end 35a of the inner tubular 35 is integral with the first secondary pipe 33, more precisely the wall internal of the latter, for example at the free end 33a of the first secondary pipe 33, as shown in FIG. figure 2 .
  • This internal tubing 35 extends further inside the main pipe 31 and has an outer section smaller than the internal section of the main pipe 31 so as not to obstruct the fluid circulation between the free end 31a of the main pipe 31 and the second secondary pipe 34.
  • the other end 35b of the inner tube 35 which forms a free end, has an orifice 36 of predetermined section, generally corresponding to the nozzle section of the lower branch 23, namely the nozzle section of a branch. usual bass of a rebreathing circuit.
  • the section of the orifice 36 can thus be of the order of 1.5 to 1.8 mm.
  • the internal diameters of the various pipes will be determined by those skilled in the art according to the flow rates desired.
  • the internal diameter of the main pipe may be of the order of 17mm, that of the inner pipe may be 9mm.
  • a small thickness of the wall of the internal tubing, for example of the order of 1 mm, can further reduce the volume occupied by the internal tubing inside the main pipe.
  • the inner pipe 35 extends inside the main pipe 31, coaxially with it, its free end 35b being located at the free end 31a of the main pipe 31.
  • the various pipes and tubings of the connector 30 are cylindrical.
  • the free end 35b of the inner pipe 35 may also project from the main pipe 31 on the free end 31a side thereof.
  • the internal tubing 35 is longer than the main pipe 31.
  • the inner tubing 35 may also be shorter, its free end 35b and therefore the orifice 36, being for example located opposite the opening 34b of the second secondary pipe 34 opening into the main pipe 31 (see figure 2 ).
  • this free end 35b can then be located between a zone A corresponding to the projection of the opening 34b in a direction perpendicular to an axis 31c of the main pipe 31 and a zone B corresponding to the extension of the second secondary pipe 34 to the inside the main pipe 31, the free end 35b of the inner pipe 35 can also occupy one of these two zones A or B.
  • the example shown figure 3 differs from that of the figure 2 by the length of the internal tubing.
  • the same elements are designated by the same references preceded by a "1".
  • one of the ends 135a of the inner tubing 135 is secured to the first secondary pipe 133 near the bifurcation 132 of the main pipe 131, in other words at the inlet of the first secondary pipe 133.
  • the end 135b of the internal tubing 135, pierced with the orifice 136, is itself located inside the main pipe 131, between the bifurcation 132 of the second secondary pipe 134 and the free end 131a of the main pipe 131.
  • a fastener 125 for the connection of the coupling 131 to the oil separator (not shown).
  • the example shown figure 4 differs from that of the figure 2 also by the length of the internal tubing.
  • the same elements are designated by the same references preceded by a "2".
  • one of the ends 235a of the internal tubing 235 is secured to the first secondary pipe 233 near the bifurcation 232 of the main pipe 231, in other words at the inlet of the first secondary pipe 233.
  • the end free 235b of the inner pipe 235, pierced with the orifice 236, is itself located inside the main pipe 231 at the bifurcation 232 of the second secondary pipe 234.
  • the end free 235b of the internal pipe 235, pierced with the orifice 236, is disposed in the extension of a wall 234c of the second secondary pipe 234, adjacent to the first secondary pipe 233.
  • a fastener 225 for connecting the fitting 231 to the oil separator (not shown).

Description

L'invention concerne un raccord de circuit de réaspiration de gaz de blow-by pour moteur à combustion interne, notamment à essence, ainsi qu'un circuit de réaspiration et un moteur correspondants.The invention relates to a blow-by gas suction circuit connection for an internal combustion engine, in particular a gasoline engine, as well as a corresponding rebreathing circuit and motor.

Les gaz de blow-by (aussi appelés gaz de carter) proviennent principalement des fuites au niveau de la segmentation des moteurs à combustion interne modernes. Ces gaz, une fois dans le carter moteur, se chargent en huile, et deviennent source de désagréments, voire de risques pour le moteur. En effet, ils participent à la consommation d'huile, génèrent une mise en pression du carter et entraînent une dégradation du système catalytique, donc une source de pollution. Il est par conséquent nécessaire de les évacuer. En raison des normes antipollution, les gaz de blow by ne sont plus rejetés directement dans l'atmosphère, mais sont réinjectés à l'admission d'air du moteur par un circuit dit de réaspiration. Avant leur introduction à l'admission d'air, ils subissent un traitement, par exemple dans un décanteur ou déshuileur à chicanes, permettant de retirer la plus grande partie de l'huile qu'ils contiennent.Blow-off gases (also known as crankcase gases) come mainly from leaks in the segmentation of modern internal combustion engines. These gases, once in the crankcase, are loaded with oil, and become a source of inconvenience, or even risk for the engine. Indeed, they participate in oil consumption, generate a crankcase pressure and cause degradation of the catalytic system, so a source of pollution. It is therefore necessary to evacuate them. Due to antipollution standards, the blow by gases are no longer released directly into the atmosphere, but are re-injected into the engine air intake via a so-called rebreathing circuit. Before their introduction to the air intake, they undergo a treatment, for example in a decanter or de-oiler baffles, to remove most of the oil they contain.

WO2013/065112A1 divulgue un circuit de réaspiration de gaz de blow-by d'un moteur à combustion interne muni d'un raccord. WO2013 / 065112A1 discloses a blow-by gas recirculation circuit of an internal combustion engine provided with a coupling.

Du fait de la teneur en vapeur d'eau des gaz de blow-by, de la glace peut se former dans le circuit de réaspiration sous l'effet de la circulation d'air générée par le roulage du véhicule en condition de grand froid (température extérieure négative). Ce problème de givrage se pose surtout pour les circuits de réaspiration à deux branches des moteurs à essence.Because of the water vapor content of the blow-by gases, ice can be formed in the rebreathing circuit under the effect of the air flow generated by the rolling of the vehicle in very cold conditions ( negative outside temperature). This problem of icing arises especially for the two branches refurbishment circuits of gasoline engines.

De tels circuits de réaspiration présentent :

  • une branche dite « haute », utilisée lorsque le moteur fonctionne à pleine charge, permettant d'évacuer les gaz de blow-by vers l'amont du boitier papillon régulant l'admission d'air dans le moteur,
  • une autre branche dite « basse » permettant d'évacuer les gaz de blow-by vers l'aval boitier papillon lorsque le boîtier papillon est fermé, le moteur fonctionnant à vide ou en charge très partielle.
Such re-suction circuits present:
  • a so-called "high" branch, used when the engine is operating at full load, making it possible to evacuate the blow-by gases upstream of the throttle body regulating the admission of air into the engine,
  • another branch called "low" to evacuate the blow-by gas downstream throttle body when the throttle body is closed, the engine running empty or very partial load.

Afin de garantir une pression carter prédéterminée, par exemple entre 0 mbar et -50mbar, on ajuste la perte de charge des branches de réaspiration en disposant des ajutages, autrement dit des restrictions de section interne, sur les branches. Classiquement, l'ajutage de la branche haute présente une section de l'ordre de 5 à 6,5 mm de diamètre. Celui de la branche basse présente une section de l'ordre de 1,5 à 1,8 mm de diamètre car les dépressions mises en jeu sont plus importantes (elles peuvent atteindre -800mbar).In order to guarantee a predetermined casing pressure, for example between 0 mbar and -50mbar, the pressure drop of the branches of re-aspiration by arranging nozzles, in other words internal section restrictions, on the branches. Conventionally, the nozzle of the upper branch has a section of the order of 5 to 6.5 mm in diameter. That of the lower branch has a section of the order of 1.5 to 1.8 mm in diameter because the depressions involved are more important (they can reach -800mbar).

Le risque de givrage des gaz de blow-by dans le circuit de réaspiration est augmenté dans les restrictions de sections où la formation de glace peut rapidement obstruer le circuit de réaspiration et donc bloquer l'évacuation des gaz de blow-by, ce qui entrainerait une augmentation de la pression du carter, plus précisément de la partie inférieure du carter. Le risque de givrage est ainsi plus élevé au niveau de l'ajutage de la branche basse. Pour cette raison, il est préconisé de le positionner au plus proche de la sortie du dispositif de séparation d'huile, généralement un décanteur, car les gaz de blow-by qui en sortent sont chauds mais vont se refroidir au fur et à mesure qu'ils vont être acheminés vers l'admission.The risk of icing of blow-by gases in the rebreathing circuit is increased in section restrictions where ice formation can quickly obstruct the rebreathing circuit and thus block blow-by gas evacuation, which would cause an increase in crankcase pressure, more precisely in the lower part of the crankcase. The risk of icing is thus higher at the nozzle of the lower branch. For this reason, it is recommended to position it as close as possible to the exit of the oil separation device, generally a decanter, because the blow-by gases that come out of it are hot but will cool down as soon as they will be sent to admission.

Une solution pourrait donc consister à positionner l'ajutage de la branche basse dès la sortie du décanteur. Cette solution est cependant couteuse car elle nécessite de développer une sortie double au niveau du décanteur, une pour la branche haute et une pour la branche basse. En outre, elle ne garantit pas un réchauffage de l'ajutage de la branche basse suffisant pour éviter un givrage lorsque seule la branche haute fonctionne. Enfin, elle augmente les risques de désemmanchement et de mise à l'air libre du circuit.One solution could therefore be to position the nozzle of the lower leg as soon as the decanter outlet. This solution is however expensive because it requires developing a double output at the decanter, one for the upper branch and one for the lower branch. In addition, it does not guarantee reheating of the low branch nozzle sufficient to prevent icing when only the upper branch is functioning. Finally, it increases the risk of unclamping and venting the circuit.

Il existe également des dispositifs de chauffage du circuit de réaspiration permettant d'éviter le givrage des gaz de blow-by dans des conditions de grand froid, incluant une circulation d'eau de radiateur, une circulation d'huile ou l'utilisation d'un élément chauffant. D'autres solutions consistent à modifier le fonctionnement du moteur quand des conditions de givrage sont détectées. Ces solutions sont toutefois complexes et coûteuses, et peuvent nécessiter un contrôle d'une condition de givrage.There are also rebreathing circuit heating devices to prevent blow-by gas icing under extreme cold conditions, including radiator water circulation, oil circulation or the use of a heating element. Other solutions are to modify the operation of the engine when icing conditions are detected. These solutions are however complex and expensive, and may require control of an icing condition.

L'invention vise à pallier au moins en partie ces inconvénients en proposant un circuit de réaspiration de gaz de blow-by selon l'objet de la revendication indépendante 1. La tubulure interne est ainsi disposée essentiellement à l'intérieur du raccord et est dimensionnée de manière à permettre :

  • une circulation d'un flux gazeux de la conduite principale vers la première conduite secondaire, le flux gazeux passant alors à l'intérieur de la tubulure interne,
  • ou une circulation d'un flux gazeux de la conduite principale vers la deuxième conduite secondaire, le flux gazeux passant alors autour de la tubulure interne.
The aim of the invention is to overcome at least part of these disadvantages by proposing a blow-by gas re-aspiration circuit according to the subject of independent claim 1. The inner tubing is thus disposed substantially inside the fitting and is dimensioned so as to allow:
  • a flow of a gas flow from the main pipe to the first secondary pipe, the gas flow then passing inside the internal pipe,
  • or a flow of a gas flow from the main pipe to the second secondary pipe, the gas flow then passing around the inner pipe.

L'orifice de section prédéterminée, lequel forme un ajutage, est ainsi déporté dans une partie du raccord qui est balayée par le flux de gaz circulant à l'intérieur du raccord quelque soit le chemin suivi par ce flux gazeux. En particulier, lorsqu'un flux de gaz circule uniquement dans la conduite principale et la deuxième conduite secondaire du raccord, les parois externes de la tubulure, et notamment l'orifice de section prédéterminée, sont dans le flux de gaz. Lorsque ces gaz sont chauds, on réchauffe ainsi cet orifice de section prédéterminée, évitant un givrage. Lorsqu'un flux de gaz circule uniquement dans la conduite principale et la première conduite secondaire du raccord, le flux de gaz circule alors également à l'intérieur de la tubulure interne en passant par l'orifice de section prédéterminée, lequel est alors réchauffé par la chaleur de ce flux de gaz. Le raccord selon l'invention permet ainsi d'éviter de manière simple et peu coûteuse un givrage au niveau de l'orifice de section prédéterminée lorsque la température externe est basse.The orifice of predetermined section, which forms a nozzle, is thus offset in a portion of the connector which is swept by the flow of gas flowing inside the connection regardless of the path followed by this gas flow. In particular, when a flow of gas flows only in the main pipe and the second secondary pipe of the connection, the outer walls of the pipe, and in particular the predetermined section orifice, are in the gas flow. When these gases are hot, thus warms this orifice of predetermined section, avoiding icing. When a flow of gas flows only through the main pipe and the first secondary pipe of the joint, the flow of gas also circulates inside the inner pipe through the predetermined section orifice, which is then heated by the heat of this gas flow. The connection according to the invention thus makes it possible to avoid, in a simple and inexpensive manner, icing at the orifice of predetermined section when the external temperature is low.

Avantageusement et de manière non limitative, la première conduite secondaire peut s'étendre dans le prolongement de la conduite principale. Ceci permet de faciliter la réalisation du raccord et de faciliter l'écoulement d'un gaz à l'intérieur du raccord. Notamment, la première conduite secondaire et la conduite principale peuvent être rectilignes et s'étendre dans le prolongement l'une de l'autre.Advantageously and without limitation, the first secondary pipe may extend in the extension of the main pipe. This makes it easier to make the coupling and to facilitate the flow of a gas inside the fitting. In particular, the first secondary pipe and the main pipe may be rectilinear and extend in the extension of one another.

Pour faciliter sa réalisation, les conduites principale et secondaires du raccord peuvent avantageusement être cylindriques, de même que la tubulure interne, laquelle peut avantageusement être coaxiale à la conduite principale et à la première conduite secondaire.To facilitate its realization, the main and secondary pipes of the coupling may advantageously be cylindrical, as well as the inner pipe, which may advantageously be coaxial with the main pipe and the first secondary pipe.

De part la conception du raccord, une extrémité de la tubulure interne est fixée à l'intérieur de la première conduite secondaire, le reste de la tubulure interne pouvant s'étendre sur une partie ou sur la totalité de la longueur de la conduite principale, voire faire saillie de celle-ci du côté de son extrémité libre.Due to the design of the fitting, one end of the inner tubing is attached to the inside of the first secondary pipe, the remainder of the inner tubing extending over part or the entire length of the main pipe, even protrude from it on the side of its free end.

Toutefois, avantageusement et de manière non limitative, l'orifice de section prédéterminée peut être disposé à l'intérieur de la conduite principale au niveau de la bifurcation. Seule l'extrémité libre de la tubulure interne est alors disposée à l'intérieur de la conduite principale. Ceci peut permettre de limiter les pertes de charge dans la conduite principale dues à la présence de la tubulure interne, tout en assurant un flux gazeux suffisant sur l'orifice de section prédéterminée pour éviter un givrage au niveau de cet orifice.However, advantageously and without limitation, the predetermined section orifice may be disposed inside the main pipe at the bifurcation. Only the free end of the inner tubing is then disposed inside the main pipe. This can make it possible to limit the pressure drops in the main pipe due to the presence of the internal tubing, while ensuring a sufficient gas flow on the orifice of predetermined section to prevent icing at this orifice.

Avantageusement, l'orifice de section prédéterminée peut être disposé à l'intérieur de la conduite principale en regard de la deuxième conduite secondaire, à savoir en regard de l'ouverture de cette deuxième conduite secondaire débouchant dans la conduite principale. Notamment, cet orifice peut être situé « en regard de » la deuxième conduite secondaire lorsqu'il est situé dans une zone correspondant à la projection de l'ouverture suivant une direction perpendiculaire à un axe de la conduite principale, ou dans une zone correspondant au prolongement de la deuxième conduite secondaire à l'intérieur de la conduite principale ou entre ces deux zones.Advantageously, the orifice of predetermined section may be disposed inside the main pipe opposite the second secondary pipe, namely opposite the opening of the second secondary pipe opening into the main pipe. In particular, this orifice may be located "opposite" the second secondary pipe when it is located in an area corresponding to the projection of the opening in a direction perpendicular to an axis of the main pipe, or in a zone corresponding to extending the second secondary pipe inside the main pipe or between these two zones.

L'orifice de section prédéterminée peut par exemple être disposé à l'intérieur de la conduite principale dans le prolongement d'une paroi de la deuxième conduite secondaire, notamment dans le prolongement d'une paroi de la deuxième conduite secondaire adjacente à la première conduite secondaire.The orifice of predetermined section may for example be disposed inside the main pipe in the extension of a wall of the second secondary pipe, in particular in the extension a wall of the second secondary pipe adjacent to the first secondary pipe.

Le raccord selon l'invention peut être réalisé en matériau polymère. Il peut alors être réalisé d'un seul tenant, par exemple par moulage par injection, ce qui permet de réduire son temps de fabrication et son coût. Le matériau polymère peut être un polyamide, par exemple chargé en fibres de verre ou tout autre matériau polymère adapté.The connection according to the invention can be made of polymer material. It can then be made in one piece, for example by injection molding, which reduces its manufacturing time and cost. The polymeric material may be a polyamide, for example filled with fiberglass or any other suitable polymeric material.

D'autres matériaux peuvent cependant également être envisagés, notamment des matériaux métalliques.Other materials may however also be envisaged, including metallic materials.

Le raccord selon l'invention pourrait également être réalisé en plusieurs parties assemblées entre elles.The connection according to the invention could also be made in several parts assembled together.

L'invention concerne encore un moteur à combustion interne, notamment à essence, comprenant un circuit d'admission d'air équipée d'une vanne de régulation et un circuit de réaspiration des gaz blow-by selon l'invention, dans lequel la première branche dudit circuit de réaspiration est raccordée au circuit d'admission d'air en aval de la vanne de régulation par rapport au sens de circulation de l'air d'admission dans le circuit d'admission d'air, la deuxième branche dudit circuit de réaspiration étant raccordée au circuit d'admission d'air en amont de la vanne de régulation.The invention also relates to an internal combustion engine, in particular a gasoline engine, comprising an air intake circuit equipped with a regulation valve and a blow-by gas re-aspiration circuit according to the invention, in which the first branch of said re-suction circuit is connected to the air intake circuit downstream of the control valve with respect to the flow direction of the intake air in the air intake circuit, the second branch of said circuit of re-aspiration being connected to the air intake circuit upstream of the regulating valve.

La première branche du circuit de réaspiration forme ainsi la branche dite « basse » mentionnée plus haut, la deuxième branche du circuit de réaspiration formant la branche dite « haute ».The first branch of the rebreathing circuit thus forms the so-called "low" branch mentioned above, the second branch of the re-aspiration circuit forming the so-called "high" branch.

Les gaz sortant du dispositif de séparation d'huile étant chauds, le positionnement du raccord selon l'invention en aval de ce dispositif de séparation et sa fixation directement à ce dispositif de séparation assurent une circulation de gaz chaud à l'intérieur du raccord selon l'invention, réduisant les risques de givrage de l'orifice de section prédéterminée, à savoir l'ajutage, de la branche basse.As the gases leaving the oil separation device are hot, the positioning of the connection according to the invention downstream of this separation device and its attachment directly to this separation device ensure a flow of hot gas inside the connection according to the invention. the invention, reducing the risk of icing of the predetermined section orifice, namely the nozzle, of the lower branch.

L'invention concerne enfin un véhicule automobile comprenant un moteur à combustion interne tel que décrit ci-dessus.The invention finally relates to a motor vehicle comprising an internal combustion engine as described above.

L'invention est maintenant décrite en référence aux dessins annexés, non limitatifs, dans lesquels :

  • la figure 1 est une représentation schématique d'un moteur à combustion interne, de son circuit d'admission d'air et de son circuit de réaspiration des gaz de blow-by ;
  • la figure 2 est une représentation schématique en coupe d'un raccord selon un mode de réalisation l'invention ;
  • la figure 3 est une représentation en coupe d'un raccord selon un autre mode de réalisation de l'invention ;
  • la figure 4 est une représentation en coupe d'un raccord selon un autre mode de réalisation de l'invention.
The invention is now described with reference to the appended non-limiting drawings, in which:
  • the figure 1 is a schematic representation of an internal combustion engine, its air intake circuit and its blow-by gas recirculation circuit;
  • the figure 2 is a schematic representation in section of a connection according to one embodiment of the invention;
  • the figure 3 is a sectional representation of a coupling according to another embodiment of the invention;
  • the figure 4 is a sectional representation of a coupling according to another embodiment of the invention.

Dans la présente description, les termes « amont » et « aval » sont à comprendre par rapport aux sens de circulation des fluides (notamment l'air d'admission et les gaz de blow by) dans les conduites.In the present description, the terms "upstream" and "downstream" are to be understood in relation to the direction of circulation of the fluids (in particular the intake air and the blow by gases) in the pipes.

La figure 1 est une représentation schématique d'un moteur à combustion interne 10 à essence, dont un seul des cylindres 11 est représenté.The figure 1 is a schematic representation of a gasoline internal combustion engine 10, of which only one of the cylinders 11 is shown.

Le cylindre 11 aspire de l'air par un circuit d'admission d'air 12 lequel comprend une vanne de régulation du débit d'air 13, généralement une vanne papillon, appelée souvent « boîtier papillon ». En amont de la vanne de régulation 13 par rapport au sens de circulation de l'air, un filtre à air 14 permet d'éliminer les impuretés éventuellement présentes dans le flux d'air avant son admission dans le cylindre. Sur la figure 1, les flèches symbolisent les circulations de fluides.The cylinder 11 draws air through an air intake circuit 12 which comprises an air flow control valve 13, usually a butterfly valve, often called "throttle body". Upstream of the regulating valve 13 with respect to the direction of air circulation, an air filter 14 makes it possible to eliminate the impurities possibly present in the air flow before it is admitted into the cylinder. On the figure 1 the arrows symbolize the circulation of fluids.

Le moteur à combustion interne 10 est également équipé d'un circuit 20 de réaspiration des gaz de blow-by, lequel comprend :

  • un dispositif de séparation d'huile 21, lequel est relié au carter inférieur 15 du moteur par une conduite 22 ;
  • une première branche 23, dite branche « basse », reliant le dispositif de séparation d'huile 21 au circuit d'admission d'air 12, en aval de la vanne de régulation 13 ;
  • une deuxième branche 24 dite « haute », reliant le dispositif de séparation d'huile 21 au circuit d'admission d'air 12, en amont de la vanne de régulation 13.
The internal combustion engine 10 is also equipped with a blow-by gas recirculation circuit 20, which comprises:
  • an oil separation device 21, which is connected to the lower casing 15 of the engine by a pipe 22;
  • a first branch 23, called "low" branch, connecting the oil separation device 21 to the air intake circuit 12, downstream of the control valve 13;
  • a second branch 24 called "high", connecting the oil separation device 21 to the air intake circuit 12, upstream of the regulation valve 13.

La première branche 23 permet d'évacuer les gaz de blow-by vers l'aval de la vanne de régulation 13 lorsque le moteur 10 fonctionne à vide ou en charge très partielle. La deuxième branche 24 permet d'évacuer les gaz de blow-by vers l'amont de la vanne de régulation 13 lorsque le moteur 10 fonctionne à pleine charge.The first branch 23 makes it possible to evacuate the blow-by gases downstream of the control valve 13 when the motor 10 is operating at a vacuum or in a very partial load. The second branch 24 makes it possible to evacuate the blow-by gases upstream of the control valve 13 when the engine 10 is operating at full load.

Le dispositif de séparation d'huile 21 est par exemple un décanteur.The oil separating device 21 is for example a decanter.

Un raccord 30 permet de raccorder le dispositif de séparation d'huile 21 à chacune des première et deuxième branches 23, 24 respectivement du circuit de réaspiration 20 des gaz de blow-by. Ce raccord 30 est décrit plus en détail en référence aux figures 2 à 4.A connector 30 makes it possible to connect the oil separator device 21 to each of the first and second branches 23, 24 respectively of the blow-by gas purge circuit 20. This connector 30 is described in more detail with reference to Figures 2 to 4 .

En référence à la figure 2, le raccord 30 est formé d'une conduite principale 31 se divisant au niveau d'une bifurcation 32 en une première conduite secondaire 33 et une deuxième conduite secondaire 34. Le raccord 30 présente une forme générale sensiblement en T ou en Y.With reference to the figure 2 the fitting 30 is formed of a main pipe 31 dividing at a bifurcation 32 into a first secondary pipe 33 and a second secondary pipe 34. The coupling 30 has a generally T-shaped or Y-shaped shape.

Dans les exemples représentés sur les figures 2 à 4, la première conduite secondaire 33 s'étend dans le prolongement de la conduite principale 31, ces deux conduites 31, 33 étant rectilignes.In the examples shown on the Figures 2 to 4 , the first secondary pipe 33 extends in the extension of the main pipe 31, these two pipes 31, 33 being rectilinear.

Le raccord 30 est raccordé par l'extrémité libre 31a de la conduite principale 31 au dispositif de séparation d'huile 21. Il est raccordé aux première et deuxième branches 23, 24 respectivement, par les extrémités libres 33a, 34a de la première conduite secondaire 33 et de la deuxième conduite secondaire 34, respectivement.The connector 30 is connected by the free end 31a of the main pipe 31 to the oil separating device 21. It is connected to the first and second branches 23, 24 respectively by the free ends 33a, 34a of the first secondary pipe 33 and the second secondary pipe 34, respectively.

Selon l'invention, le raccord 30 comprend une tubulure interne 35 en communication de fluide avec la première conduite secondaire 33. A cet effet, une extrémité 35a de la tubulure interne 35 est solidaire de la première conduite secondaire 33, plus précisément de la paroi interne de cette dernière, par exemple au niveau de l'extrémité libre 33a de la première conduite secondaire 33, comme représenté sur la figure 2. Cette tubulure interne 35 s'étend en outre à l'intérieur de la conduite principale 31 et présente une section externe inférieure à la section interne de la conduite principale 31 afin de ne pas obstruer la circulation de fluide entre l'extrémité libre 31a de la conduite principale 31 et la deuxième conduite secondaire 34.According to the invention, the connector 30 comprises an internal tubing 35 in fluid communication with the first secondary pipe 33. For this purpose, one end 35a of the inner tubular 35 is integral with the first secondary pipe 33, more precisely the wall internal of the latter, for example at the free end 33a of the first secondary pipe 33, as shown in FIG. figure 2 . This internal tubing 35 extends further inside the main pipe 31 and has an outer section smaller than the internal section of the main pipe 31 so as not to obstruct the fluid circulation between the free end 31a of the main pipe 31 and the second secondary pipe 34.

L'autre extrémité 35b de la tubulure interne 35, laquelle forme une extrémité libre, présente un orifice 36 de section prédéterminée, correspondant généralement à la section d'ajutage de la branche basse 23, à savoir la section d'ajutage d'une branche basse usuelle d'un circuit de réaspiration. La section de l'orifice 36 peut ainsi être de l'ordre de 1,5 à 1,8mm.The other end 35b of the inner tube 35, which forms a free end, has an orifice 36 of predetermined section, generally corresponding to the nozzle section of the lower branch 23, namely the nozzle section of a branch. usual bass of a rebreathing circuit. The section of the orifice 36 can thus be of the order of 1.5 to 1.8 mm.

De manière générale, les diamètres internes des différentes conduites seront déterminés par l'homme du métier en fonction des débits recherchés. A titre d'exemple, le diamètre interne de la conduite principale peut être de l'ordre de 17mm, celui de la tubulure interne peut être de 9mm. Une faible épaisseur de la paroi de la tubulure interne, par exemple de l'ordre de 1mm, peut en outre permettre de réduire le volume occupé par la tubulure interne à l'intérieur de la conduite principale.In general, the internal diameters of the various pipes will be determined by those skilled in the art according to the flow rates desired. For example, the internal diameter of the main pipe may be of the order of 17mm, that of the inner pipe may be 9mm. A small thickness of the wall of the internal tubing, for example of the order of 1 mm, can further reduce the volume occupied by the internal tubing inside the main pipe.

Dans l'exemple représenté sur la figure 2, la tubulure interne 35 s'étend à l'intérieur de la conduite principale 31, coaxialement à celle-ci, son extrémité libre 35b étant située au niveau l'extrémité libre 31a de la conduite principale 31. Ici, les différentes conduites et tubulures du raccord 30 sont cylindriques.In the example shown on the figure 2 , the inner pipe 35 extends inside the main pipe 31, coaxially with it, its free end 35b being located at the free end 31a of the main pipe 31. Here, the various pipes and tubings of the connector 30 are cylindrical.

Tel que déjà décrit, l'extrémité libre 35b de la tubulure interne 35 peut également faire saillie de la conduite principale 31 du côté de l'extrémité libre 31a de celle-ci. Dans ce cas (non représenté), la tubulure interne 35 est plus longue que la conduite principale 31.As already described, the free end 35b of the inner pipe 35 may also project from the main pipe 31 on the free end 31a side thereof. In this case (not shown), the internal tubing 35 is longer than the main pipe 31.

La tubulure interne 35 peut également être plus courte, son extrémité libre 35b et par conséquent l'orifice 36, étant par exemple situés en regard de l'ouverture 34b de la deuxième conduite secondaire 34 débouchant dans la conduite principale 31 (voir figure 2). Autrement dit, en référence à la figure 2, cette extrémité libre 35b peut alors être située entre une zone A correspondant à la projection de l'ouverture 34b suivant une direction perpendiculaire à un axe 31c de la conduite principale 31 et une zone B correspondant au prolongement de la deuxième conduite secondaire 34 à l'intérieur de la conduite principale 31, l'extrémité libre 35b de la tubulure interne 35 pouvant occuper également l'une de ces deux zones A ou B.The inner tubing 35 may also be shorter, its free end 35b and therefore the orifice 36, being for example located opposite the opening 34b of the second secondary pipe 34 opening into the main pipe 31 (see figure 2 ). In other words, with reference to figure 2 this free end 35b can then be located between a zone A corresponding to the projection of the opening 34b in a direction perpendicular to an axis 31c of the main pipe 31 and a zone B corresponding to the extension of the second secondary pipe 34 to the inside the main pipe 31, the free end 35b of the inner pipe 35 can also occupy one of these two zones A or B.

L'exemple représenté figure 3 diffère de celui de la figure 2 par la longueur de la tubulure interne. Les mêmes éléments sont désignés par les mêmes références précédées d'un « 1 ». Dans le mode de réalisation de la figure 3, l'une des extrémités 135a de la tubulure interne 135 est solidarisée à la première conduite secondaire 133 à proximité de la bifurcation 132 de la conduite principale 131, autrement dit au niveau de l'entrée de la première conduite secondaire 133. L'extrémité libre 135b de la tubulure interne 135, percée de l'orifice 136, est quant à elle située à l'intérieur de la conduite principale 131, entre la bifurcation 132 d'avec la deuxième conduite secondaire 134 et l'extrémité libre 131a de la conduite principale 131. Sur cette figure 3, est également représenté un raccord de fixation 125 pour le branchement du raccord 131 au dispositif de séparation d'huile (non représenté).The example shown figure 3 differs from that of the figure 2 by the length of the internal tubing. The same elements are designated by the same references preceded by a "1". In the embodiment of the figure 3 , one of the ends 135a of the inner tubing 135 is secured to the first secondary pipe 133 near the bifurcation 132 of the main pipe 131, in other words at the inlet of the first secondary pipe 133. The end 135b of the internal tubing 135, pierced with the orifice 136, is itself located inside the main pipe 131, between the bifurcation 132 of the second secondary pipe 134 and the free end 131a of the main pipe 131. On this figure 3 , there is also shown a fastener 125 for the connection of the coupling 131 to the oil separator (not shown).

L'exemple représenté figure 4 diffère de celui de la figure 2 également par la longueur de la tubulure interne. Les mêmes éléments sont désignés par les mêmes références précédées d'un « 2 ». Dans le mode de réalisation de la figure 4, l'une des extrémités 235a de la tubulure interne 235 est solidarisée à la première conduite secondaire 233 à proximité de la bifurcation 232 de la conduite principale 231, autrement dit au niveau de l'entrée de la première conduite secondaire 233. L'extrémité libre 235b de la tubulure interne 235, percée de l'orifice 236, est quant à elle située à l'intérieur de la conduite principale 231 au niveau de la bifurcation 232 d'avec la deuxième conduite secondaire 234. Plus précisément, l'extrémité libre 235b de la tubulure interne 235, percée de l'orifice 236, est disposée dans le prolongement d'une paroi 234c de la deuxième conduite secondaire 234, adjacente à la première conduite secondaire 233. Sur cette figure 4, est également représenté un raccord de fixation 225 pour le branchement du raccord 231 au dispositif de séparation d'huile (non représenté).The example shown figure 4 differs from that of the figure 2 also by the length of the internal tubing. The same elements are designated by the same references preceded by a "2". In the embodiment of the figure 4 , one of the ends 235a of the internal tubing 235 is secured to the first secondary pipe 233 near the bifurcation 232 of the main pipe 231, in other words at the inlet of the first secondary pipe 233. The end free 235b of the inner pipe 235, pierced with the orifice 236, is itself located inside the main pipe 231 at the bifurcation 232 of the second secondary pipe 234. More specifically, the end free 235b of the internal pipe 235, pierced with the orifice 236, is disposed in the extension of a wall 234c of the second secondary pipe 234, adjacent to the first secondary pipe 233. On this figure 4 , there is also shown a fastener 225 for connecting the fitting 231 to the oil separator (not shown).

Sur les figures, 2 à 4, les flèches représentent les flux gazeux lorsque la branche dite basse 23 est fermée. On notera que l'extrémité libre 35b, 135b, 235b portant l'orifice 36, 136, 236 respectivement faisant office d'ajutage, est longée par les gaz chauds, permettant ainsi d'éviter un givrage de ces gaz au niveau de cet orifice 36, 136, 236 respectivement.On the figures, 2 to 4 the arrows represent the gas flows when the so-called lower branch 23 is closed. It will be noted that the free end 35b, 135b, 235b carrying the orifice 36, 136, 236 respectively acting as a nozzle, is lined by the hot gases, thereby preventing icing of these gases at this orifice 36, 136, 236 respectively.

L'invention n'est pas limitée aux modes de réalisation décrits. Ces différents modes de réalisation peuvent en outre être combinés les uns avec les autres.The invention is not limited to the described embodiments. These different embodiments may further be combined with each other.

Claims (9)

  1. Circuit (20) for reaspiration of blow-by gas of an internal combustion engine (10), comprising an oil separation device (21), a first branch (23) and a second branch (24), said reaspiration circuit (20), comprising a coupling (30, 130, 230) formed by a main pipe (31, 131, 231) dividing in the area of a fork (32, 132, 232) into a first secondary pipe (33, 133, 233) and a second secondary pipe (34, 134, 234), said coupling comprising an internal tube (35, 135, 235) extending at least partly inside the main pipe (31, 131, 231) and having an external cross section less than the internal cross section of the main pipe, said internal tube (35, 135, 235) being secured by one of its ends (35a, 135a, 235a) to the first secondary pipe (33, 133, 233) and being in fluidic communication with it, said internal tube (35, 135, 235) having another free end (35b, 135b, 235b) having an orifice (36, 136, 236) of predetermined cross section, said internal tube (35, 135, 235) being adapted such that the orifice (36, 136, 236) of predetermined cross section is disposed inside the main pipe between a free end (31a, 131a, 231a) of the main pipe and said fork (32, 132, 232), or it projects from said main pipe at its free end, characterized in that the free end (31a, 131a, 231a) of the main pipe (31, 131, 231) of the coupling is connected to said oil separation device (21), the first secondary pipe (33, 133, 233) of the coupling being connected to the first branch (23) and the second secondary pipe (34, 134, 234) of the coupling being connected to the second branch (24).
  2. Reaspiration circuit (20) according to Claim 1, characterized in that the first secondary pipe (33, 133, 233) of the coupling (30, 130, 230) extends in the prolongation of the main pipe (31, 131, 231).
  3. Reaspiration circuit (20) according to either one of Claims 1 and 2, characterized in that the orifice (36, 136, 236) of predetermined cross section of the coupling is disposed inside the main pipe in the area of the fork (32, 132, 232).
  4. Reaspiration circuit (20) according to any one of Claims 1 to 3, characterized in that the orifice (36, 136, 236) of predetermined cross section of the coupling is disposed inside the main pipe opposite the second secondary pipe (34, 134, 234).
  5. Reaspiration circuit (20) according to any one of Claims 1 to 4, characterized in that the orifice (36, 136, 236) of predetermined cross section of the coupling is disposed inside the main pipe in the prolongation of a wall of the second secondary pipe (34, 134, 234).
  6. Reaspiration circuit (20) according to any one of Claims 1 to 5, characterized in that the orifice (236) of predetermined cross section of the coupling is disposed inside the main pipe in the prolongation of a wall (234c) of the second secondary pipe adjacent to the first secondary pipe.
  7. Reaspiration circuit according to any one of Claims 1 to 6, characterized in that it is made of polymer material, for example of a single piece.
  8. Internal combustion engine (10), comprising an air intake circuit (12) equipped with a regulating valve (13) and a circuit (20) for reaspiration of blow-by gases according to any one of Claims 1 to 7, in which the first branch (23) of said reaspiration circuit (20) is connected to the air intake circuit (12) downstream from the regulating valve (13) with respect to the direction of circulation of the intake air in the air intake circuit (20), the second branch (24) of said reaspiration circuit being connected to the air intake circuit (12) upstream from the regulating valve (13).
  9. Motor vehicle comprising an internal combustion engine (10) according to Claim 8.
EP15714558.2A 2014-04-23 2015-03-03 Circuit for reaspirating blow-by gas for an internal combustion engine, notably petrol engine Active EP3134637B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1453625A FR3020413B1 (en) 2014-04-23 2014-04-23 BLOW-BY GAS REASPIRATION CIRCUIT CONNECTION FOR INTERNAL COMBUSTION ENGINE, ESPECIALLY GASOLINE
PCT/FR2015/050517 WO2015162345A1 (en) 2014-04-23 2015-03-03 Coupling for a circuit for reaspirating blow-by gas for an internal combustion engine, notably petrol engine

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EP3134637A1 EP3134637A1 (en) 2017-03-01
EP3134637B1 true EP3134637B1 (en) 2018-07-18

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EP (1) EP3134637B1 (en)
CN (1) CN106460736B (en)
FR (1) FR3020413B1 (en)
WO (1) WO2015162345A1 (en)

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CZ308465B6 (en) * 2019-07-09 2020-09-02 Ĺ KODA AUTO a.s. Crankcase with a crankcase ventilation assembly

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Publication number Priority date Publication date Assignee Title
JP2539849Y2 (en) * 1991-05-31 1997-07-02 スズキ株式会社 Blow-by gas reduction device
CN103906901B (en) * 2011-10-31 2016-04-27 丰田自动车株式会社 The air-changing control device of internal-combustion engine

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EP3134637A1 (en) 2017-03-01
CN106460736B (en) 2019-11-05
WO2015162345A1 (en) 2015-10-29
FR3020413A1 (en) 2015-10-30
CN106460736A (en) 2017-02-22
FR3020413B1 (en) 2019-04-26

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