EP3134637B1 - Circuit de réaspiration de gaz de blow-by pour moteur à combustion interne, notamment à essence - Google Patents

Circuit de réaspiration de gaz de blow-by pour moteur à combustion interne, notamment à essence 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
Authority
EP
European Patent Office
Prior art keywords
circuit
main pipe
pipe
reaspiration
coupling
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.)
Active
Application number
EP15714558.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3134637A1 (fr
Inventor
Franck Alizon
Emilie CARTIER
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.)
Renault SAS
Original Assignee
Renault SAS
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Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP3134637A1 publication Critical patent/EP3134637A1/fr
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Publication of EP3134637B1 publication Critical patent/EP3134637B1/fr
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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.
  • 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).

Landscapes

  • 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)
EP15714558.2A 2014-04-23 2015-03-03 Circuit de réaspiration de gaz de blow-by pour moteur à combustion interne, notamment à essence Active EP3134637B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1453625A FR3020413B1 (fr) 2014-04-23 2014-04-23 Raccord de circuit de reaspiration de gaz de blow-by pour moteur a combustion interne, notamment a essence
PCT/FR2015/050517 WO2015162345A1 (fr) 2014-04-23 2015-03-03 Raccord de circuit de reaspiration de gaz de blow-by pour moteur a combustion interne, notamment a essence

Publications (2)

Publication Number Publication Date
EP3134637A1 EP3134637A1 (fr) 2017-03-01
EP3134637B1 true EP3134637B1 (fr) 2018-07-18

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Application Number Title Priority Date Filing Date
EP15714558.2A Active EP3134637B1 (fr) 2014-04-23 2015-03-03 Circuit de réaspiration de gaz de blow-by pour moteur à combustion interne, notamment à essence

Country Status (4)

Country Link
EP (1) EP3134637B1 (zh)
CN (1) CN106460736B (zh)
FR (1) FR3020413B1 (zh)
WO (1) WO2015162345A1 (zh)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ308465B6 (cs) * 2019-07-09 2020-09-02 Ĺ KODA AUTO a.s. Kliková skříň se sestavou pro odvětrání klikové skříně

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2539849Y2 (ja) * 1991-05-31 1997-07-02 スズキ株式会社 ブローバイガス還元装置
CN103906901B (zh) * 2011-10-31 2016-04-27 丰田自动车株式会社 内燃机的换气控制装置

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* Cited by examiner, † Cited by third party
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Also Published As

Publication number Publication date
CN106460736A (zh) 2017-02-22
FR3020413A1 (fr) 2015-10-30
EP3134637A1 (fr) 2017-03-01
FR3020413B1 (fr) 2019-04-26
CN106460736B (zh) 2019-11-05
WO2015162345A1 (fr) 2015-10-29

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