EP2028364B1 - Atomiseur d'injecteur de carburant pour systèmes de préparation de mélange pour automobile - Google Patents

Atomiseur d'injecteur de carburant pour systèmes de préparation de mélange pour automobile Download PDF

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Publication number
EP2028364B1
EP2028364B1 EP20080162767 EP08162767A EP2028364B1 EP 2028364 B1 EP2028364 B1 EP 2028364B1 EP 20080162767 EP20080162767 EP 20080162767 EP 08162767 A EP08162767 A EP 08162767A EP 2028364 B1 EP2028364 B1 EP 2028364B1
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EP
European Patent Office
Prior art keywords
nozzle holes
atomizer
injector
outer layer
inner layer
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.)
Not-in-force
Application number
EP20080162767
Other languages
German (de)
English (en)
Other versions
EP2028364A2 (fr
EP2028364A3 (fr
Inventor
Michael Pontoppidan
Gino Montanari
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 Sistemas Automotivos Industria e Comercio Ltda
Original Assignee
Magneti Marelli Sistemas Automotivos Industria e Comercio Ltda
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Publication date
Application filed by Magneti Marelli Sistemas Automotivos Industria e Comercio Ltda filed Critical Magneti Marelli Sistemas Automotivos Industria e Comercio Ltda
Publication of EP2028364A2 publication Critical patent/EP2028364A2/fr
Publication of EP2028364A3 publication Critical patent/EP2028364A3/fr
Application granted granted Critical
Publication of EP2028364B1 publication Critical patent/EP2028364B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M61/1813—Discharge orifices having different orientations with respect to valve member direction of movement, e.g. orientations being such that fuel jets emerging from discharge orifices collide with each other

Definitions

  • the present patent application refers to a double layer fuel injector atomizer layout for mixture preparation systems, which provides a spray pattern shaped in a desired form and with an appropriate momentum without the use of any mechanical adaptor on the downstream side of the atomizer.
  • the fuel injector is a key element in the combustion control process of any Spark Ignited (SI) Internal Combustion (IC) engine.
  • SI Spark Ignited
  • IC Internal Combustion
  • the primary cycle in a SI-engine is the air-cycle, which introduces at each intake stroke a certain amount of fresh gas (hereafter referred to as the gas-core) in the combustion chamber.
  • the liquid fuel is injected into the gas core to mix with the gas before being introduced into the cylinder.
  • the fuel injector can basically be divided in three functional parts:
  • the fuel is usually delivered by a pressurized fuel rail (hereafter referred to as rail) (100) to the top of the fuel injector (200) then it passes through the sealing seat area (300) and finally it is metered and injected into the gas core through the atomizer plate (400).
  • Rail pressurized fuel rail
  • Figure 1 shows an example of a flat seat injector layout.
  • the spray is composed of droplets of various diameters produced by the breakup capability of the atomizer device and of vapor, which diffuses from the free droplet surfaces. Initially, the most important mass fraction is contained in the droplets.
  • the droplet velocity vectors are also determined by the atomizer design.
  • the atomizer plate is normally designed with one or multiple nozzle holes, which guide each produced spray in a given direction according to the ratio between the length (L H ) and diameter (D H ) of each nozzle hole.
  • the spray momentum distribution varies across the spray volume mainly controlled by three factors: the initial droplet distribution, the droplet free path vaporization, and any coalescence of droplets in the spray volume.
  • the initial droplet distribution is related to the available rail-pressure and the nozzle hole effective flow area.
  • the effective flow area of a nozzle hole or holes cannot be freely chosen. It is determined by the steady average flow requirement imposed by the engine type and displacement.
  • the number of nozzle holes will determine the initial breakup of droplets (size and velocity). To provide a homogeneous momentum distribution within the spray it is important that the initial droplets and their velocity vectors are contained within precise limits determined by both the dynamic gas core momentum and by a precise control of the droplet coalescence phenomenon.
  • the object of the present invention is a fuel injector atomizer according to claim 1.
  • Advantageous embodiments of the atomizer are the subject matter of claims 2-9.
  • Advantageous effects of such an atomizer are that the two concentric circular layers of nozzle holes generate droplets with a desired size and average spray direction to allow an improved spray momentum control in the injector far field and thereby improve the mixture distribution in the combustion chamber.
  • the present invention refers only to a fuel injector atomizer, which may be used in a wide range of injectors, with no limitation to a specific injector actuator or metering device design.
  • FIG. 2 shows a flat atomizer plate (1) together with the lower part of the cylindrical pintle (2) including the integrated upper part of the flat seat structure (3).
  • the core of the present invention concerns only the center area of the atomizer (4), which is located inside the perimeter limited by the inner sealing ring of the flat seat structure (3). This part of the atomizer (4) is entirely located on the downstream side of the sealing area.
  • Figure 3 shows further details of the atomizer area of interest.
  • the axis A-A represents the injector symmetry axis.
  • a flat area is used in the present example to represent the central area of the atomizer (4), other shapes (dome or conical), which could be of interest may be used.
  • two concentric layers of nozzle holes (5, 6) are located in the center area of the atomizer (4), with an inner layer (5) characterized by a radius R1 and an outer layer (6) characterized by a radius R2 from the symmetry axis A-A.
  • Typical but not limitative values for R1 are between 0.2 and 0.5 mm and for R2 between 0.6 and 1 mm.
  • the axes of the nozzle holes located in the outer layer (6) and thereby the axis of each spray emerging from a hole are always parallel to the injector axis A-A.
  • the sprays produced by the nozzle holes in the outer layer (6) form a trunk-conical shape with a cone angle ⁇ , typically between 10o and 20o, a symmetry axis located on the injector axis A-A and embrace the inner-layer sprays.
  • the axes of the nozzle holes located in the inner-layer (5) form a positive angle ⁇ with the injector axis A-A.
  • the value of ⁇ is determined in such a way that the sprays generated by the inner layer (5) produce a grazing collision with the sprays from the outer layer (6) at a desired distance from the injector tip, as Figure 3b shows. By this means the coalescence phenomenon is well controlled. Typically, but not limited to, the values of ⁇ remain between 3o and 10o .
  • the total number of nozzle holes is distributed only in the inner and outer layers in such a way that the number of nozzle holes in the outer layer (6) is always equal or superior to the number of nozzle holes in the inner layer (5).
  • Figure 4 shows two illustrative examples of possible layouts for the nozzle hole locations.
  • Figure 4a shows an atomizer having an inner layer (5) with two opposite nozzle holes and an outer layer (6) with 3 nozzle holes with an angular separation of 72o between the two nearest nozzle holes and 144o between these and the third nozzle hole.
  • Figure 4b shows an atomizer having an inner layer (5) with three nozzle holes and an outer layer (6) with three nozzle holes with an angular separation of 120o in both layers.
  • Figure 5 shows a non-claimed example of another Double Layer (DL) atomizer layout.
  • DL Double Layer

Claims (9)

  1. Pulvérisateur d'injecteur de carburant pour systèmes d'injection, constitué d'une plaque de pulvérisateur (1), positionnée sur le côté aval d'un téton d'injecteur (2) avec une partie supérieure d'une structure de siège (3), possédant une zone centrale de pulvérisateur (4), positionnée à l'intérieur du périmètre limité par une bague d'étanchéité de ladite structure de siège (3), et possédant deux couches concentriques de trous de buse (5, 6) dans la zone centrale du pulvérisateur (4), dans lequel la couche intérieure (5) possède un rayon R1 et la couche extérieure (6) possède un rayon R2 par rapport à l'axe de symétrie (AA) de l'injecteur, lesdits trous de buse positionnés dans la couche intérieure (5) possédant des axes formant un angle divergeant positif α par rapport à l'axe d'injecteur (AA), caractérisé en ce que les trous de buse positionnés dans la couche extérieure (6) possèdent des axes qui sont parallèles à l'axe d'injecteur (AA).
  2. Pulvérisateur selon la revendication 1, caractérisé en ce que la plaque de pulvérisateur (1) possède une forme plate, bombée conique ou sphérique.
  3. Pulvérisateur selon la revendication 1, caractérisé en ce que ladite couche extérieure (6) possède un nombre de trous de buse égal ou supérieur au nombre total de trous de buse dans la couche intérieure (5).
  4. Pulvérisateur selon la revendication 1, caractérisé en ce que α est entre 3° et 10° par rapport à l'axe d'injecteur (AA).
  5. Pulvérisateur selon la revendication 1, caractérisé en ce qu'il possède les trous de buse dans la couche extérieure (6) produisant des pulvérisations formant une forme tronconique avec un angle de cône β, un axe de symétrie positionné sur l'axe d'injecteur (AA) et embrassant les pulvérisations produites par les trous de buse dans la couche intérieure (5).
  6. Pulvérisateur selon la revendication 5, caractérisé en ce que l'angle de cône β est entre 10° et 20°.
  7. Pulvérisateur selon la revendication 1, caractérisé en ce qu'il possède une couche intérieure (5) avec deux trous de buse opposés et une couche extérieure (6) avec trois trous de buse avec une séparation angulaire de 72° entre les deux trous de buse les plus proches et 144° entre chacun de ces trous de buse les plus proches et le troisième trou de buse.
  8. Pulvérisateur selon la revendication 1, caractérisé en ce qu'il possède une couche intérieure (5) avec trois trous de buse et une couche extérieure (6) avec trois trous de buse avec une séparation angulaire de 120° dans les deux couches (5, 6).
  9. Pulvérisateur selon la revendication 1, caractérisé par le fait que la structure de siège est une structure de siège plate (3).
EP20080162767 2007-08-24 2008-08-21 Atomiseur d'injecteur de carburant pour systèmes de préparation de mélange pour automobile Not-in-force EP2028364B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BRPI0703812-7A BRPI0703812B1 (pt) 2007-08-24 2007-08-24 Atomizador para sistemas de injeção de combustível

Publications (3)

Publication Number Publication Date
EP2028364A2 EP2028364A2 (fr) 2009-02-25
EP2028364A3 EP2028364A3 (fr) 2009-04-01
EP2028364B1 true EP2028364B1 (fr) 2012-07-11

Family

ID=40090001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080162767 Not-in-force EP2028364B1 (fr) 2007-08-24 2008-08-21 Atomiseur d'injecteur de carburant pour systèmes de préparation de mélange pour automobile

Country Status (3)

Country Link
EP (1) EP2028364B1 (fr)
BR (1) BRPI0703812B1 (fr)
ES (1) ES2388946T3 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB400836A (en) * 1932-03-19 1933-11-02 Schweizerische Lokomotiv Improvements in or relating to fuel nozzles for internal combustion engines
DE19642513A1 (de) * 1996-10-15 1998-04-16 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
JP3164023B2 (ja) * 1997-06-25 2001-05-08 トヨタ自動車株式会社 内燃機関の燃料噴射弁
JP2000314360A (ja) 1999-04-30 2000-11-14 Aisan Ind Co Ltd 燃料噴射弁
JP3837282B2 (ja) * 2000-10-24 2006-10-25 株式会社ケーヒン 燃料噴射弁
DE10060290A1 (de) * 2000-12-05 2002-06-06 Bosch Gmbh Robert Brennstoffeinspritzventil
US20050224605A1 (en) * 2004-04-07 2005-10-13 Dingle Philip J Apparatus and method for mode-switching fuel injector nozzle
US20070068142A1 (en) * 2005-09-27 2007-03-29 Robel Wade J Engine system with low and high NOx generation algorithms and method of operating same

Also Published As

Publication number Publication date
EP2028364A2 (fr) 2009-02-25
ES2388946T3 (es) 2012-10-22
BRPI0703812B1 (pt) 2018-07-24
BRPI0703812A2 (pt) 2009-08-11
EP2028364A3 (fr) 2009-04-01

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