EP1599671B1 - Injecteur de carburant pour moteur a combustion interne - Google Patents

Injecteur de carburant pour moteur a combustion interne Download PDF

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Publication number
EP1599671B1
EP1599671B1 EP04715357A EP04715357A EP1599671B1 EP 1599671 B1 EP1599671 B1 EP 1599671B1 EP 04715357 A EP04715357 A EP 04715357A EP 04715357 A EP04715357 A EP 04715357A EP 1599671 B1 EP1599671 B1 EP 1599671B1
Authority
EP
European Patent Office
Prior art keywords
main
orifice
jet
fuel
injector
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.)
Expired - Lifetime
Application number
EP04715357A
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German (de)
English (en)
French (fr)
Other versions
EP1599671A2 (fr
Inventor
Michael Pontoppidan
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.)
Marelli Argentan France SAS
Original Assignee
Magneti Marelli Motopropulsion France 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 Magneti Marelli Motopropulsion France SAS filed Critical Magneti Marelli Motopropulsion France SAS
Publication of EP1599671A2 publication Critical patent/EP1599671A2/fr
Application granted granted Critical
Publication of EP1599671B1 publication Critical patent/EP1599671B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
    • F02M61/1826—Discharge orifices having different sizes
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size

Definitions

  • the present invention relates to a fuel injector for spraying fuel into the combustion chamber of an engine. More particularly, it relates to an injector comprising a head which has a free outer face and which is provided with at least one main orifice adapted to spray a fuel jet in a so-called main direction and at least one secondary orifice suitable for spraying. a jet of fuel in a so-called secondary direction, said main and secondary openings opening into the outer face and communicating directly with a common injection chamber which is selectively placed in communication with a supply chamber.
  • the spray must have a certain directionality and a penetration speed sufficient to obtain a wealth around the candle at the time of ignition, which ignites the mixture.
  • the depth of the spray that increases with the injection pressure must not be excessive, especially in order not to spray fuel against the walls of the combustion chamber.
  • swirl injector injectors in English, in which the fuel is guided in a vortex movement in the injector before being sprayed.
  • These injectors make it possible to obtain a good atomization but, besides their high cost, they have the disadvantage of creating a significant internal pressure drop in the supply pressure and consequently make it essential to apply a high force to operate the needle control of these injectors.
  • these injectors create a weakly directional jet with a relatively low rate of penetration into the chamber, which in some cases makes it more difficult to obtain a stratified mixture, i.e. a gas mixture. whose fuel richness is greater in certain parts of the combustion chamber.
  • the object of the present invention is to overcome these drawbacks by proposing an injector which allows direct injection under high pressure into the combustion chamber with a high efficiency spray and a certain directionality, without, however, significantly increasing the penetration depth of the combustion chamber. atomized jet of fuel and the cost of the injector.
  • the invention relates to a fuel injector of the aforementioned type, characterized in that said secondary direction forms an angle ⁇ of between 10 ° and 80 °, preferably between 15 ° and 45 °, and even more preferentially approximately equal to 25 °, with said main direction so that the secondary jet intercepts the main jet in a so-called burst zone which starts at a distance d , measured along the main direction from the outer face of the head, included between 1 and 15 mm, and preferably between 1 and 5 mm, and in that the flow rate of the secondary jet is between 80% and 100% of the flow of the main jet.
  • this injector whose holes can be made by simple cylindrical holes through a metal part, such as a sheet, does not cause significant additional manufacturing cost.
  • the invention also relates to the use of an injector as defined above, with a spark ignition engine, wherein the injector is arranged to directly spray the fuel into the combustion chamber.
  • Figure 1 schematically shows a cross section of a four-stroke internal combustion engine, spark ignition and direct fuel injection.
  • the engine 1 comprises one or more cylinders 2 extending along a longitudinal axis XX and in which is slidably mounted according to the longitudinal axis a piston 3.
  • the piston 3 is connected to a crankshaft (not shown) by a connecting rod 4.
  • a combustion chamber 5 is delimited by the upper end of the cylinder 2, a cavity 6 formed opposite the piston 3 in a cylinder head 7 attached to the cylinder 2, and by an end face 9 of the piston head 8
  • the cavity 6 of the yoke 7 is a cavity called "roof", that is to say it has two inclined planes connecting at a vertex 6a intersecting the longitudinal axis XX of the cylinder 2.
  • the cylinder head 7 comprises a spark plug 10 provided with electrodes 11 arranged in the region of the top 6a of the cylinder head.
  • the present invention is applied to a diesel-type compression ignition engine.
  • the cavity 6 of the cylinder head 7 comprises an intake port 14 at the downstream end of an intake duct 15 and an exhaust port 17 at the upstream end of an exhaust duct 19.
  • the lights intake 14 and exhaust 17 are respectively closed by an intake valve 16 and an exhaust valve 18 whose opening and closing are controlled by any known means, such as a camshaft.
  • any known means such as a camshaft.
  • the shape of the combustion chamber 5 and the number of the valves (16, 18) may be different without departing from the scope of the present invention.
  • the yoke 7 also comprises an injector 12 provided with an injection head 13, which extends along a Y-Y axis.
  • the head 13 of the injector has an outer face 20 arranged in the combustion chamber 5.
  • the injector 12 is connected to a fuel supply line, not shown.
  • the driving feedstock contains high pressure fuel, that is to say a pressure which reaches at least momentarily a value greater than 100 bar and which substantially corresponds to the pressure at which the fuel is injected into the combustion chamber.
  • high pressure fuel that is to say a pressure which reaches at least momentarily a value greater than 100 bar and which substantially corresponds to the pressure at which the fuel is injected into the combustion chamber.
  • common rail common rail
  • the head of the injector made according to the invention can be used in an injector-pump type injection system in which the injector is associated with a high pressure pump.
  • the external face 20 of the injector head 13 is provided with a main orifice 21 adapted to spray a jet of fuel, represented schematically by the contour 22, coming from a chamber 24.
  • the jet 22 of the main orifice 21 is oriented in a direction P, said principal, determined by the shape of the orifice 21 and corresponding to the axis of symmetry of the base of the jet 22.
  • the outer face 20 is also provided with a secondary orifice 25 adapted to spray a jet of fuel 26 in a direction S said secondary.
  • the outer face 20, and more precisely the portion thereof in which the openings open is free of any obstacle that could hide one or other of the orifices.
  • the secondary orifice 25 also communicates directly with the injection chamber 24 which is thus common to the main and secondary orifices, so that the spraying by the two types of orifice is simultaneous.
  • the injection chamber 24 is selectively brought into communication with a feed chamber 27 containing pressurized fuel.
  • the communication between the injection chamber 24 and the feed chamber 27 is obtained by raising a needle 28 from a seat 29 formed in the head 13 of the injector.
  • the lifting of the needle 28 can be controlled by mechanical, electromagnetic or piezoelectric means synchronized with the rotation of the crankshaft.
  • end 28a of the needle has a complementary geometry to the inner face of the head 13 to minimize the volume of the injection chamber 24, to prevent fuel flow into the combustion chamber 5 to an unwanted moment.
  • the secondary direction S of the secondary jet 26 is oriented towards the main direction P of the main jet 22 so that the secondary jet 26 intercepts the main jet 22 in a so-called burst zone shown schematically by the contour 30, and the flow the secondary jet 26 is at most equal to the flow of the main jet 22.
  • the main direction P and the secondary direction S form between them an angle of about 25 °.
  • the angle ⁇ may be between 10 ° and 80 °, but it is preferable that the angle ⁇ remains between 15 ° and 45 °.
  • the burst zone 30 starts at a distance d measured along the main direction P from the outside face 20 of the injector head 13. This distance d is between 1 and 15 mm to obtain a good compromise between the directionality and the bursting of the main jet 22, but is preferably less than 5 mm to obtain an early burst and a relatively limited penetration depth.
  • the directionality and the penetration speed required for the fuel injected into the combustion chamber are obtained, in particular by adjusting the distance between the orifices and the angle ⁇ .
  • the atomized fuel jet forms a solid cone, and not a hollow cone such as that obtained with a vortex injector.
  • the secondary direction S it is not absolutely necessary for the secondary direction S to cut exactly the main direction P. In fact, given the diameters and the flow rates of the main fuel jet and the secondary jet, it is possible to obtain sufficient interception of the fuel jets with a secondary direction S slightly offset from the main direction P, which limits the depth of penetration.
  • the main orifice 21 and the secondary orifice 25 are cylindrical holes opening perpendicular to the face outer 20 of the head. These cylindrical holes opening perpendicularly to the outer face 20 are advantageously made by electroerosion. But it is possible to achieve them by other known techniques, such as punching.
  • the orifices (21, 25) could have a different shape, especially in the case of an injector for a diesel engine. Indeed, for this type of engine, the fuel injection pressure is significantly higher, greater than 1000 bar and the wall of the head 13 of the injector is thicker, which allows for the formation of orifices. truncated.
  • the orifices (21, 25) open directly into the injection chamber 24, which limits the pressure drops in the head of the injector, unlike the vortex injection nozzles which require a device upstream of the orifice to animate the fuel in a circular motion.
  • the outer face 20 of the head 13 comprises a portion 32 having an outwardly oriented concavity and in which the main orifice 21 and the secondary orifice 25 open perpendicularly, so that the secondary direction S is oriented towards the main direction P.
  • the concave portion 32 has a continuous curvature that can be obtained by stamping an initially flat sheet metal portion.
  • Figure 3 which shows a second embodiment of a fuel injector according to the invention, it is possible to multiply the number of main orifices and the number of secondary orifices.
  • the head 13 of the injector 12 comprises, in this second embodiment, two main orifices (21a, 21b) which respectively spray jets of fuel, not shown, in a main direction Pa and a main direction Pb.
  • the main directions Pa and Pb are divergent and form between them an angle ⁇ of about 15 °.
  • the outer face 20 of this second embodiment comprises two main orifices (21a, 21b) to which two secondary orifices (25a, 25b) are respectively associated.
  • the secondary orifices 25a are situated diametrically opposite to the main orifice 21a, which makes it possible to maintain a certain symmetry of the main jet of fuel from the bursting zone. Note that it is possible to maintain this symmetry by having more than two secondary orifices distributed regularly angularly around the main orifice 21a.
  • the secondary directions Sa jets sprayed by the secondary orifices 25a are arranged so that the secondary jets intercept the main jet of the orifice 21a in a same longitudinal position of the main direction Pa.
  • the two main orifices (21a, 21b) and the four secondary orifices (25a, 25b) are comprised in the same plane, but it is conceivable to arrange the two main orifices 21a, 21b in a first longitudinal plane of the head 13 of the injector and the secondary orifices (25a, 25b) in two planes perpendicular to the first longitudinal plane.
  • the outer face 20 comprises a first portion concave 32a in which open the orifices 21a and 25a and a second concave portion 32b into which the openings 21b and 25b.
  • Each concave portion (32a; 32b) has three facets, a central facet into which the main orifice opens perpendicularly and two lateral facets into which the secondary orifices open perpendicularly.
  • the wall of the injector having the facets is relatively thin in the case where the pressure in the feed chamber 27 does not exceed 500 bars.
  • this portion of the outer face having the concavities (32a, 32b) is then formed by stamping, that is to say by deformation and not machining or molding, a portion initially flat.
  • the injector made according to the invention is arranged in a spark ignition engine so as to spray the gasoline directly into the combustion chamber.
  • the injector according to the invention makes it possible to very precisely adjust the characteristics of the spray jet, and in particular the direction, speed and depth of penetration, as well as the atomization of the fuel, which is particularly advantageous for this type. engine.
  • a spark ignition engine requires a very precise spraying, in particular to have a sufficient wealth in the region of the ignition means at the moment when it is triggered.
  • the main direction P of the main orifice, or main orifices is arranged taking into account the geometry of the combustion chamber, such as the presence of a hollow 33 and a flange 34 formed on the end face 9 of the piston, and the circulation gases inside the combustion chamber to obtain a richness between 0.7 and 1.2 near the electrodes 11 of the spark plug 10 at the time of the creation of a spark between the electrodes.
  • the main direction P forms a more or less pronounced angle with the longitudinal axis YY of the injector 12, or that in the case of several main orifices, the main directions (Pa, Pb) are not arranged symmetrically with respect to the longitudinal axis YY of the injector.
  • the head 13 of the injector made according to the invention creates little internal pressure drop and therefore, the injector 12 can be fed by a common rail containing high pressure fuel.
  • the fuel supply pressure of the injector 12 preferably reaches a peak value of between 150 bar and 500 bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
EP04715357A 2003-02-28 2004-02-27 Injecteur de carburant pour moteur a combustion interne Expired - Lifetime EP1599671B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0302466 2003-02-28
FR0302466A FR2851792B1 (fr) 2003-02-28 2003-02-28 Injecteur de carburant pour moteur a combustion interne
PCT/FR2004/000459 WO2004079178A2 (fr) 2003-02-28 2004-02-27 Injecteur de carburant pour moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1599671A2 EP1599671A2 (fr) 2005-11-30
EP1599671B1 true EP1599671B1 (fr) 2006-07-19

Family

ID=32843064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04715357A Expired - Lifetime EP1599671B1 (fr) 2003-02-28 2004-02-27 Injecteur de carburant pour moteur a combustion interne

Country Status (9)

Country Link
US (1) US7237527B2 (pt)
EP (1) EP1599671B1 (pt)
CN (1) CN100587253C (pt)
AT (1) ATE333586T1 (pt)
BR (1) BRPI0407918B1 (pt)
DE (1) DE602004001580T2 (pt)
ES (1) ES2268634T3 (pt)
FR (1) FR2851792B1 (pt)
WO (1) WO2004079178A2 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1505342B1 (en) * 2003-08-04 2012-03-07 Continental Automotive GmbH A method of minimizing deposits in a fuel injector

Families Citing this family (16)

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Publication number Priority date Publication date Assignee Title
DE102005023258A1 (de) * 2004-11-16 2006-11-23 Fan Separator Gmbh Drehtrommel zur aeroben Erwärmung rieselfähiger Feststoffe
FR2881185A1 (fr) * 2005-01-26 2006-07-28 Magneti Marelli Motopropulsion Injecteur de carburant et moteur comprenant un tel injecteur
WO2006084085A1 (en) * 2005-02-04 2006-08-10 Ismailov Murad M Liquid spray system and nozzle with improved spray generation
CN101641500B (zh) * 2007-06-29 2012-01-25 三菱自动车工业株式会社 缸内喷射式内燃机
JP2011506849A (ja) * 2007-12-21 2011-03-03 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング 燃料噴射弁
US9932883B2 (en) * 2012-08-29 2018-04-03 Mazda Motor Corporation Spark-ignition direct-injection engine
JP2016501333A (ja) 2012-11-20 2016-01-18 ノストラム エナジー ピーティーイー．リミテッドＮｏｓｔｒｕｍ Ｅｎｅｒｇｙ Ｐｔｅ．Ｌｔｄ． 衝突ジェットを有する液体噴射噴霧装置
US20140175192A1 (en) * 2012-12-21 2014-06-26 Quantlogic Corporation Mixed-mode fuel injector with a variable orifice
US9506439B2 (en) * 2015-04-13 2016-11-29 Caterpillar Inc. Ducted combustion systems utilizing adjustable length ducts
CN106479660B (zh) * 2016-12-25 2022-07-26 重庆海国科技有限公司 三级高真空滤油系统
US10487787B2 (en) * 2017-06-20 2019-11-26 Caterpillar Inc. Injector tip for a fuel injector
WO2021059773A1 (ja) * 2019-09-25 2021-04-01 ボッシュ株式会社 燃料噴射弁及び燃料噴射弁を備える内燃機関
CN111482772B (zh) * 2020-04-21 2021-04-20 四川航天中天动力装备有限责任公司 一种组合式燃油喷嘴的加工工艺
JP7529580B2 (ja) * 2021-01-19 2024-08-06 本田技研工業株式会社 内燃機関
WO2022261486A1 (en) * 2021-06-11 2022-12-15 Cummins Inc. Method and apparatus for hard machining orifices in fuel system and engine components
US12078136B2 (en) * 2022-05-20 2024-09-03 Caterpillar Inc. Fuel injector nozzle assembly including needle having flow guiding tip for directing fuel flow

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IT1085959B (it) * 1977-08-04 1985-05-28 Alfa Romeo Spa Iniettore di benzina per motori a scoppio
US5540200A (en) * 1993-12-28 1996-07-30 Nissan Motor Co., Ltd. Fuel injection valve
DE19642513A1 (de) * 1996-10-15 1998-04-16 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19858345A1 (de) * 1998-01-06 1999-07-08 Mitsubishi Motors Corp Brennstoffeinspritzdüse
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DE19922964C2 (de) * 1999-05-19 2003-03-27 Daimler Chrysler Ag Verfahren zum Einspritzen von Dieselkraftstoff
US20050224605A1 (en) * 2004-04-07 2005-10-13 Dingle Philip J Apparatus and method for mode-switching fuel injector nozzle
US7243862B2 (en) * 2004-04-07 2007-07-17 Delphi Technologies, Inc. Apparatus and method for mode-switching fuel injector nozzle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1505342B1 (en) * 2003-08-04 2012-03-07 Continental Automotive GmbH A method of minimizing deposits in a fuel injector

Also Published As

Publication number Publication date
US7237527B2 (en) 2007-07-03
WO2004079178A2 (fr) 2004-09-16
FR2851792A1 (fr) 2004-09-03
BRPI0407918A (pt) 2006-03-01
FR2851792B1 (fr) 2007-02-09
US20060231065A1 (en) 2006-10-19
DE602004001580T2 (de) 2007-07-19
DE602004001580D1 (de) 2006-08-31
ES2268634T3 (es) 2007-03-16
CN1754041A (zh) 2006-03-29
BRPI0407918B1 (pt) 2016-03-01
WO2004079178A3 (fr) 2004-10-14
CN100587253C (zh) 2010-02-03
EP1599671A2 (fr) 2005-11-30
ATE333586T1 (de) 2006-08-15

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