FR2879248A1 - Gas intake duct stopper for internal combustion engine of motor vehicle, has intake device with movable unit movable between two end positions in which duct is opened and closed, where unit is fixed in cylinder head - Google Patents

Gas intake duct stopper for internal combustion engine of motor vehicle, has intake device with movable unit movable between two end positions in which duct is opened and closed, where unit is fixed in cylinder head Download PDF

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Publication number
FR2879248A1
FR2879248A1 FR0452935A FR0452935A FR2879248A1 FR 2879248 A1 FR2879248 A1 FR 2879248A1 FR 0452935 A FR0452935 A FR 0452935A FR 0452935 A FR0452935 A FR 0452935A FR 2879248 A1 FR2879248 A1 FR 2879248A1
Authority
FR
France
Prior art keywords
movable
duct
cylinder
intake
cylinder head
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.)
Pending
Application number
FR0452935A
Other languages
French (fr)
Inventor
Frederic Lavoisier
Sebastien Capelle
Thomas Guerineau
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Priority to FR0452935A priority Critical patent/FR2879248A1/en
Publication of FR2879248A1 publication Critical patent/FR2879248A1/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B31/00Modifying induction systems for imparting a rotation to the charge in the cylinder
    • F02B31/04Modifying induction systems for imparting a rotation to the charge in the cylinder by means within the induction channel, e.g. deflectors
    • F02B31/06Movable means, e.g. butterfly valves
    • F02B31/08Movable means, e.g. butterfly valves having multiple air inlets, i.e. having main and auxiliary intake passages
    • F02B31/085Movable means, e.g. butterfly valves having multiple air inlets, i.e. having main and auxiliary intake passages having two inlet valves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Abstract

The stopper has two ducts (1, 2) to permit gas in a cylinder (3). The ducts fill the cylinder and rotate the gas flow in the cylinder respectively. An intake device has a movable unit (5) movable between two end positions in which the duct (1) is opened and closed, respectively, and intermediate positions where the duct (1) is partially closed. The unit is fixed in the cylinder head. An independent claim is also included for a motor vehicle equipped of combustion engine whose cylinder head is equipped of gas intake device.

Description

Device for closing the intake ducts of a combustion engine
  The present invention relates to a device for closing the gas intake ducts in a cylinder of an internal combustion engine, in particular an internal combustion engine of a motor vehicle. These ducts are, in particular, characterized by two main parameters: the permeability, which characterizes the ease with which said ducts allow said gases to pass through the inlet, and the turbulence, which characterizes the rotation of the gaseous mass in the cylinder around the axis of said cylinder. For direct injection diesel engines, in particular, high turbulence is, in particular, necessary to ensure a correct mixture of fuel and oxidant at the time of the injection phase: it is, in a conventional manner, obtained by specific architectures of the intake ducts.
  Permeability and turbulence vary inversely from each other: in fact, at low engine loads, the permeability requirement is low, whereas the need for turbulence is high; on the other hand, when the engine load is high, mixing the fuel and the oxidant is easier, requiring only low levels of turbulence, while the need for permeability is, in this case, stronger.
  The difficulty in achieving correct combustion in all engine speeds is then to achieve one or more satisfactory compromises between these two parameters.
  The solutions put in place to solve this problem are mainly of two types: defining a single compromise for all operating points of the engine, or setting up, within the intake duct, a movable flap leading to degrade the permeability, and thereby to increase turbulence.
  The first of these solutions is the simplest to achieve, but does not allow, by definition, any adjustment according to engine speeds. On the other hand, in some cases it may not be possible to define a single trade-off.
  A commonly adopted solution is then the establishment in the intake duct, a movable flap for changing the flow of the gas mass.
  Document US4760821 thus presents a device in which, in a manner known in the state of the art, two gas admission ducts are associated with a cylinder of a combustion chamber. The first of these ducts, or "turbulence" duct, has a specific architecture enabling the gaseous mass to be rotated at its inlet into said cylinder: in particular, said first duct forms, in the vicinity of its outlet in said chamber, combustion, substantially a spiral. The second of these conduits, or "filling" conduit, has a simpler geometry, and comprises a flap movable in rotation about an axis integral with said conduit. This flap can take different positions between a first extreme position where it does not close said "filling" duct and is in a plane substantially parallel to the main flow direction of the gas flow, and a second extreme working position in which said shutter substantially closes all of said "filling" duct. When the internal combustion engine operates with a high load, the need for permeability is important, the flap is then in the rest position, in which it only minimally disturbs the flow of the gas mass through the duct. "filling" admission. When the internal combustion engine operates with a low load, and as previously mentioned, the need for permeability is low in view of the need for turbulence: the flap then takes an intermediate position in which it closes more or less important depending on the need, said inlet duct "filling", thus disrupting the flow of said gas mass within said duct.
  Such a device induces however, including when the flap is in its first extreme position in which the closure of said "filler" duct is minimal, disturbances in the direction of flow, as well as pressure losses along said leads, and thus degrades the quality of said flow. In addition, it may be relatively difficult to precisely control the positioning of the flap within said duct, and said shutter can also clog up over time, leading to a degradation of the performance of the system.
  The present invention aims to provide a system for closing a gas inlet duct to a combustion chamber so as to generate a variable and easily controllable level of turbulence, and with a limited risk of fouling .
  The invention achieves its goal by means of a device for closing the gas intake ducts in a cylinder of a combustion chamber of an internal combustion engine, in which at least a first and a second duct allow said gas to enter said cylinder, each of said at least a first and second conduit opening, at one of its ends, on the cylinder head of said engine, and opening, at its opposite end, into said cylinder, wherein said at least one first duct is suitable for a maximum filling of said cylinder and said at least one second duct is suitable for a rotation in said cylinder of the flow of gas passing through said intake device further comprising a movable element between a first extreme position in which it does not close said at least one first conduit and a second end position in which it substantially substantially closes said at least a first con duit, said movable member being able to take a set of intermediate positions in which it partially closes said at least one first conduit, characterized in that said movable element is fixed on said cylinder head.
  Advantageously, the surface of said movable member is substantially parallel to the surface of said yoke in the vicinity of the openings of said at least first and second ducts thereon, and substantially perpendicular to the direction of said first and second ducts at their ends opening on said cylinder head.
  Advantageously, a portion of said movable member is recessed, and the surface of said recessed portion is substantially greater than or equal to the sum of the surfaces of the openings of said at least first and second ducts in said cylinder head and the surface of the element of said cylinder head between these two said openings.
  In a preferred embodiment of the invention, said movable element is a substantially plane disk rotatable about its axis of revolution. Advantageously, the surface of said recessed portion is substantially equal to half the surface of said disk. ro
  Other characteristics and advantages of the invention will emerge on reading the description which follows, with reference to the appended drawings, in which: FIG. 1 is a schematic perspective view of a preferred embodiment of the invention; FIG. 2 is a side view, in the direction indicated by arrow A in FIG. 1, of a preferred embodiment of the invention, FIG. 3A is a view, in a plane substantially parallel to the surface of said mobile element, of your first extreme position of said movable element, FIG. 3B is a view, in a plane substantially parallel to the surface of said movable element, of the second extreme position of said movable element, FIG. 3C is a view, in a plane substantially parallel to the surface of said movable member, an intermediate position of said movable member.
  FIG. 1 shows a schematic perspective view of two gas intake ducts, 1 and 2 respectively, with a cylinder 3 of a combustion chamber of an internal combustion engine, for example an internal combustion engine of a motor vehicle. Each of said ducts 1 and 2 opens, at one of its ends, into said cylinder 3, and at its opposite end, on the cylinder head 4 of said internal combustion engine, as shown in FIG. 2.
  The specific geometries of said ducts 1 and 2 are not detailed in FIGS. 1 and 2, but, in one embodiment known in the state of the art, said first duct 1 is suitable for allowing a maximum filling of said cylinder 3 by said gases, and said second duct 2 is suitable for allowing said gas mass to be rotated at the inlet into said cylinder 3. The rotation of said gas mass is schematically represented in FIG. 1 by the arrow R. In the device according to the invention, a mobile element 5 is placed on the cylinder head 4 of said engine, substantially parallel to the surface of said cylinder head 4 in the vicinity of the openings of said at least first and second ducts 1 and 2 thereon, and substantially perpendicular to the direction of said first and second ducts 1 and 2 at their end opening on said cylinder head 4. A portion 6 of this element 5 is recessed, the surface of said recessed portion 6 being substantially greater than or equal to the sum of the surfaces of the two openings of said at least first and second ducts 1 and 2 and the surface of the element of said cylinder head 4 between these two said openings. This movable element 5 thus makes it possible, as will now be described, to completely or partially block said first duct 1, thus leading to a general modification of the flow of gases at the inlet into said cylinder 3.
  In a preferred embodiment of the invention, which is nonlimiting, shown in FIGS. 1, 2, 3A, 3B, and 3C, said movable element 5 is a mobile disk rotated about its axis of revolution, and the surface of said recessed portion 6 is substantially equal to half of the surface of said disk 5.
  FIGS. 3A, 3B, and 3C respectively show, for the preferred embodiment of the invention in which said movable member 5 is a disc of which substantially one half has been recessed, the different extreme positions of said movable member 5, as well as an intermediate position. The arrows F in FIGS. 3A, 3B, and 3C indicate the possibilities of rotation of said movable element 5 about its axis of revolution.
  FIG. 3A shows the first end position of said movable element 5, in which the two ducts 1 and 2 completely allow the inlet gases to pass. In this position, the flow rate of gas in said first duct 1 is maximum as well as the permeability, and, proportionally, the level of turbulence within said cylinder 3 is minimal: this position corresponds, as previously described, to engine operating regimes with a high load.
  FIG. 3B shows the second end position of said movable element 5, in which only said second duct 2 passes through the inlet gases, the opening of said first duct 1 being completely closed by the non-recessed portion of said movable element 5. position, the flow rate of gas through ro of said second duct 2 is maximum, the flow rate in said first duct 1 being zero: the turbulence level is thus maximum, while the permeability is minimal, and this position corresponds, as it has previously been described, a low-load operation of the internal combustion engine.
  Finally, FIG. 3C shows an intermediate position of said movable element 5, in which said first duct 1 is partially closed: the level of turbulence and the permeability are, in this position, intermediate.
  It is thus possible, thanks to the device according to the invention, to control and adjust the respective levels of permeability and turbulence at the intake of gases in a cylinder of an internal combustion engine: the adjustment parameter may, for example and without limitation, be a rotational speed or an instantaneous power of said motor, measured by means of a suitable sensor and whose value is transmitted to a combustion management computer of said engine driving the movement of said appropriate moving element 5.
  Said suitable movable element is, moreover, easily accessible directly on the cylinder head of said internal combustion engine: its disassembly, for possible maintenance operations, can therefore be achieved without the need for heavy dismantling of engine components, as c ' is the case when said movable element is placed inside one of the intake ducts. Similarly, its shape, its dimensions, and its position on the cylinder head 4 of said engine reduce the risk of fouling of said mobile element 5, as well as the risks of disturbance of the gas flow that may result.
  Said movable element 5 is also, in the preferred embodiment of the invention, compact, and a reduced cost of implementation.

Claims (7)

claims
  1. Device for closing the gas intake ducts in a cylinder (3) of a combustion chamber of an internal combustion engine, in which at least a first and a second duct (1) and (2) allow said gases to enter said cylinder (3), each of said at least first and second conduits (1) and (2) opening, at one of its ends, on the cylinder head (4) of said engine, and opening at its opposite end in said cylinder (3), wherein said at least one first conduit (1) is suitable for maximum filling of said cylinder (3) and said at least one second conduit (2) is suitable for placing in rotation, in said cylinder (3), the flow of gas passing therethrough, said intake device further comprising an element (5) movable between a first end position in which it does not close said at least one first duct ( 1) and a second extreme position in which it substantially closes said at least one first conduit (1), said movable element (5) being able to take a set of intermediate positions in which it partially closes said at least one first conduit (1), characterized in that said movable element (5) is fixed on said yoke (4).
  2. Device according to claim 1, characterized in that the surface of said movable member (5) is substantially parallel to the surface of said yoke (4) in the vicinity of the openings of said at least a first and second ducts (1) and (2). ) on the latter, and substantially perpendicular to the direction of said first and second conduits (1) and (2) at their end opening on said cylinder head (4).
  3. Device according to either of claims 1 or 2, characterized in that said movable member (5) comprises at least one recessed portion (6).
  4. Device according to any one of claims 1 to 3, characterized in that the surface of said recessed portion (6) is substantially greater than or equal to the sum of the surfaces of the openings of said at least a first and second ducts (1). and (2) in said yoke (4) and the surface of the element of said yoke (4) between said two openings.
  5. Device according to any one of claims 1 to 4, characterized in that said movable member (5) is a substantially planar disc rotatable about its axis of revolution.
  6. Device according to any one of claims 1 to 5, characterized in that the surface of said recessed portion (6) is substantially equal to half of the surface of said movable member (5).
  7. A motor vehicle equipped with a combustion engine whose cylinder head (4) is equipped with at least one gas intake device in at least one of the cylinders (3) according to any one of claims 1 to 6.
FR0452935A 2004-12-13 2004-12-13 Gas intake duct stopper for internal combustion engine of motor vehicle, has intake device with movable unit movable between two end positions in which duct is opened and closed, where unit is fixed in cylinder head Pending FR2879248A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0452935A FR2879248A1 (en) 2004-12-13 2004-12-13 Gas intake duct stopper for internal combustion engine of motor vehicle, has intake device with movable unit movable between two end positions in which duct is opened and closed, where unit is fixed in cylinder head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0452935A FR2879248A1 (en) 2004-12-13 2004-12-13 Gas intake duct stopper for internal combustion engine of motor vehicle, has intake device with movable unit movable between two end positions in which duct is opened and closed, where unit is fixed in cylinder head

Publications (1)

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FR2879248A1 true FR2879248A1 (en) 2006-06-16

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FR0452935A Pending FR2879248A1 (en) 2004-12-13 2004-12-13 Gas intake duct stopper for internal combustion engine of motor vehicle, has intake device with movable unit movable between two end positions in which duct is opened and closed, where unit is fixed in cylinder head

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592916A (en) * 1995-11-03 1997-01-14 Ford Motor Company Internal combustion engine having intake port throttles incorporating charge motion control
GB2334303A (en) * 1998-02-11 1999-08-18 Ford Global Tech Inc An ic engine intake duct having a curved baffle plate
EP1279812A2 (en) * 2001-07-24 2003-01-29 Aisan Kogyo Kabushiki Kaisha Intake air control devices for internal combustion engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592916A (en) * 1995-11-03 1997-01-14 Ford Motor Company Internal combustion engine having intake port throttles incorporating charge motion control
GB2334303A (en) * 1998-02-11 1999-08-18 Ford Global Tech Inc An ic engine intake duct having a curved baffle plate
EP1279812A2 (en) * 2001-07-24 2003-01-29 Aisan Kogyo Kabushiki Kaisha Intake air control devices for internal combustion engines

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