Classifications

• • 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.
• 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).
• the aim of the invention is to overcome at least part of these disadvantages by proposing a blow-by gas re-aspiration circuit connector intended to connect two branches of the rebreathing circuit to an oil separation device, the connection being formed of a conduct main branch dividing at a bifurcation into a first secondary duct and a second secondary duct, characterized in that it comprises an internal duct extending at least partly inside the main duct and having an external section lower than the internal section of the main pipe, said inner pipe being secured by one of its ends to the first secondary pipe being in fluid communication therewith, said inner pipe having another free end having a predetermined section orifice said inner pipe being shaped so that the predetermined section orifice is disposed within the main pipe between a free end of the main pipe and said bifurcation or protrudes from said main pipe at its free end.
• the inner tubing is thus disposed substantially inside the fitting and is dimensioned so as to allow:
• 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 way an 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 a blast-gas recirculation circuit of an internal combustion engine, in particular a gasoline engine, comprising an oil separation device, a first branch and a second branch, and a coupling according to the invention.
• a blast-gas recirculation circuit of an internal combustion engine in particular a gasoline engine
• the free end of the main pipe of this connector being connected to said oil separation device
• the first secondary pipe of the connector being connected to the first branch
• the second secondary pipe of the connector being connected to the second branch.
• 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.
• Figure 1 is a schematic representation of an internal combustion engine, its air intake circuit and its blow-by gas recirculation circuit;
• FIG. 2 is a schematic sectional representation of a coupling according to one embodiment of the invention.
• Figure 3 is a sectional representation of a coupling according to another embodiment of the invention.
• Figure 4 is a sectional representation of a coupling according to another embodiment of the invention.
• 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.
• 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 1 1 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 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 via a pipe 22;
• 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 FIGS. 2 to 4.
• connection 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 shape. or Y.
• the first secondary pipe 33 extends in the extension of the main pipe 31, these two pipes 31, 33 being straight.
• 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 Figure 2.
• This inner pipe 35 further extends inside the main pipe 31 and has a lower outer section to the inner 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.
• the section of the orifice 36 can thus be of the order of 1, 5 to 1, 8mm.
• 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 internal 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, for example being located facing 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 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 in FIG. 3 differs from that of FIG. 2 in 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 pipe 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 the first secondary pipe 133.
• the free end 135b of the inner pipe 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
• FIG. 4 differs from that of FIG. 2 also in 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 inner pipe 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
• the free end 235b of the internal tubing 235, pierced with the orifice 236, is located inside the main pipe 231 at the bifurcation 232 of the second secondary pipe 234. More precisely, the free end 235b of the internal tubing 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. In this FIG. there is also shown a fastener 225 for connecting the fitting 231 to the oil separator (not shown).
• 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.
• the invention is not limited to the described embodiments. These different embodiments may further be combined with each other.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=50933410

Family Applications (1)

Country Status (4)

Cited By (1)

Citations (2)

• 2014
  • 2014-04-23 FR FR1453625A patent/FR3020413B1/fr not_active Expired - Fee Related
• 2015
  • 2015-03-03 WO PCT/FR2015/050517 patent/WO2015162345A1/fr active Application Filing
  • 2015-03-03 EP EP15714558.2A patent/EP3134637B1/fr active Active
  • 2015-03-03 CN CN201580026295.2A patent/CN106460736B/zh active Active

Patent Citations (2)

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