EP0482136B1 - Dispositif d'injection d'un melange de carburant et de gaz - Google Patents

Dispositif d'injection d'un melange de carburant et de gaz Download PDF

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Publication number
EP0482136B1
EP0482136B1 EP91906604A EP91906604A EP0482136B1 EP 0482136 B1 EP0482136 B1 EP 0482136B1 EP 91906604 A EP91906604 A EP 91906604A EP 91906604 A EP91906604 A EP 91906604A EP 0482136 B1 EP0482136 B1 EP 0482136B1
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EP
European Patent Office
Prior art keywords
gas
fuel
valve
injection
contact surface
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
EP91906604A
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German (de)
English (en)
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EP0482136A1 (fr
Inventor
Wolfgang Ketterer
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0482136A1 publication Critical patent/EP0482136A1/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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/08—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the fuel being carried by compressed air into main stream of combustion-air

Definitions

  • the invention relates to a device for injecting a fuel-gas mixture according to the preamble of the main claim.
  • a device for injecting a fuel-gas mixture is already known, in which a fuel injector is surrounded by a stepped longitudinal bore in a valve seat. Downstream of an injection end of the fuel injector, a mixing line is formed in the valve receptacle, which is connected upstream via a gas gap formed between the injection end and the longitudinal bore to a gas ring channel which is connected to a gas source.
  • this device has the disadvantage that the gas is supplied to the gas ring channel by means of a single line and flows downstream through the gas gap into the mixing line. There is therefore a risk that the fuel jet will be asymmetrically influenced by the supplied gas, so that a fuel film forms on the walls of the mixing line. The formation of a largely homogeneous fuel-gas mixture is therefore not guaranteed.
  • the size of the gas ring gap and the quality of the centering of the fuel injector also depends on the length and shape tolerances of the fuel injector and the longitudinal bore of the valve seat.
  • the device according to the invention with the characterizing features of the main claim has the advantage that the fuel jet is not asymmetrically influenced by the symmetrical supply of the gas through the at least two opposing stomata of the gas gap in the mixing line. This reduces the risk of a fuel film forming on the walls of the mixing line and ensures the formation of a largely homogeneous fuel-gas mixture.
  • the device has a particularly compact design and can be manufactured in a simple manner.
  • valve receptacle For the simplest possible design of the valve receptacle, it is advantageous if two gas gaps start from the gas ring channel.
  • center lines of the two gas gaps opening into the mixing line with opposing gap openings lie in one plane through the longitudinal valve axis, so that a uniform and symmetrical inflow of the gas through the gas gaps to the gap openings opening into the mixing line takes place.
  • the gas ring channel is at least semicircular.
  • the contact surface of the longitudinal bore and the spray end of the fuel injector are frustoconically tapered radially towards the valve longitudinal axis, so that the position of the spray end to the mixing line is determined in a simple manner directly at the spray end itself.
  • the gas gaps are inclined in the downstream direction towards the longitudinal axis of the valve, so that the gas flowing downstream entrains fuel which may be deposited on the wall of the mixing line at high speed.
  • a regulator gap branches off from the mixing line, which is formed between the spray end and the contact surface of the valve receptacle and which is connected to a pressure regulator, so that the pressure is measured as close as possible to the spray end of the fuel injector. This is necessary because the pressure regulator regulates the fuel pressure or the pressure of the gas supplied relative to the spray point.
  • FIG. 1 shows the exemplary embodiment with a partially illustrated fuel injector and with a partially illustrated valve receptacle
  • FIG. 2 shows a section along the line II-II in FIG. 1
  • FIG. 3 shows a view of the valve receptacle in the direction of the arrow X in FIG. 1.
  • the device shown in FIG. 1, for example, for injecting a fuel-gas mixture into an intake pipe or directly into a mixture-compressing spark-ignition internal combustion engine has a fuel injection valve 1, which has a frustoconical tapering end 3 and a valve seat 4, which has a stepped longitudinal bore 5 and extends concentrically to the valve longitudinal axis 2 and surrounds the spray end 3.
  • the spray end 3 of the fuel injection valve 1 lies partly against a frustoconical contact surface 6 of the valve receptacle 4 forming a section of the longitudinal bore 5 and tapering radially towards the longitudinal axis 2 of the valve, starting from a cylinder section 7 of the longitudinal bore 5, the contact surface 6 and the frustoconical spray end 3 run parallel to each other.
  • the frustoconical design of the spray end 3 and the contact surface 6 of the valve receptacle 4 result in a simple, but nevertheless very exact centering of the spray end 3 of the fuel injector 1 in the longitudinal bore 5.
  • the fuel injector 1 has a valve closing body 9 which interacts with a fixed valve seat 8. Downstream of the valve seat 8, the injection end 3 of the fuel injection valve 1 has, for example, an injection opening 10 which is concentric with the longitudinal axis 2 of the valve, but a plurality of injection openings can also be provided.
  • a cylindrical mixing line 12 is formed downstream of the spray end 3 of the fuel injector 1, into which the fuel is injected through the spray opening 10 of the fuel injector 1.
  • the mixing line 12 can both in an injection line, which the fuel-gas mixture immediately one single cylinder of the internal combustion engine or a single point in the intake pipe, also open into a mixture distributor which divides the fuel-gas mixture into the individual cylinders of the internal combustion engine and it by means of a number of cylinders corresponding to the number of injection lines to the individual cylinders or individual points in the intake pipe.
  • valve receptacle 4 Between the frustoconical spray end 3 and the conically tapering contact surface 6 of the valve receptacle 4 are at the end of the contact surface 6 facing away from the mixing line 12, as also from FIG. 3, which shows a view of the valve holder 4 in the direction of the arrow X in FIG. 1
  • a semicircular gas ring channel 15 and two gas gaps 16 extending from it, the center lines 17 of which lie in one plane through the valve longitudinal axis 2 are formed.
  • the valve receptacle 4 in the contact surface 6 has a semicircular groove 21, which at its two ends merges into a radial groove 22 running along the center line 17.
  • both the semicircular groove 21 and the two radial grooves 22 can in addition to the rectangular shown in the figures, any other z. B. have semicircular cross-sectional shape.
  • the two gas gaps 16 open into the mixing line 12 with gap openings 19 lying opposite one another, so that the radial forces exerted on the fuel jet centrally sprayed through the spray opening 10 and caused by the gas supply are canceled out and the fuel jet is not deflected.
  • the supply to the individual pairs of gas gaps 16 can also take place via a separate gas ring channel 15 in order to achieve a more uniform distribution of the supplied gas to the individual gas gaps 16 and a uniform flow rate into the mixing line 12. For this it may be necessary if the gas ring channels 15 and / or the gas gaps 16 run in different levels of the valve receptacle 4.
  • the gas gaps 16 open out into the mixing line 12 due to the conically tapering contact surface 6 in the downstream direction towards the longitudinal axis 2 of the valve. This improves the formation of the fuel-gas mixture, since the gas flowing downstream can possibly adhere to the Wall of the mixing line 12 entrains fuel at high speed. In addition, the risk of asymmetrical influencing of the fuel jet is particularly low because the gas flows into the mixing line 12 in addition to the radial directional component with an axial one.
  • the gas gaps 16 may have a cross-sectional area that changes in the direction of the gap openings 19.
  • Cross-sectional area reducing toward the stomata 19 causes an additional acceleration of the gas, so that the gas flows at a higher speed through the stomata 19 into the mixing line 12 and improves the formation of the fuel-gas mixture there.
  • Precondition for the exact and symmetrical formation of the gas gaps 16 serving the gas metering and the gas supply to the mixing line 12 is the exact centering of the spray end 3 of the fuel injector 1 in the longitudinal bore 5 of the valve receptacle 4.
  • FIG. 2 shows a section along the line II-II in FIG. 1.
  • the gas is supplied to the semicircular gas ring channel 15 by means of a gas supply channel 25 formed in the valve receptacle 4, which is connected to a gas source 26.
  • the gas feed channel 25 opens with its feed channel opening 27 in a plane perpendicular to the two center lines 17 of the gas gaps 16 and perpendicular to the contact surface 6 centrally into the gas ring channel 15.
  • Both fresh air and an inert gas and a mixture of the two can be used as the gas for forming the fuel-gas mixture.
  • the fresh air is branched off, for example, from the intake pipe in front of an arbitrarily adjustable throttle element and is fed directly to the gas supply channel 25.
  • an inert gas z. B. use the exhaust gas of the internal combustion engine so that the pollutant emissions of the internal combustion engine are reduced by this exhaust gas recirculation.
  • the pressure regulator 34 regulates the supply of the gas and, for this purpose, acts on a gas feed pump 33 or another pressure generating device.
  • the longitudinal bore 5, the gas supply channel 25 and the regulator channel 32 are formed by machining.
  • the grooves 21, 22, 29 of the gas ring channel 15, the gas gap 16 and the regulator gap 30 in the conically tapering contact surface 6 of the valve receptacle 4 can be formed by stamping to reduce the manufacturing costs.
  • a further possibility for producing a valve receptacle 4 according to the invention is to design the valve receptacle 4 as a molded plastic part, so that particularly low manufacturing costs result.
  • the truncated cone-shaped spray end 3, together with the contact surface 6 which tapers parallel to it and tapers radially towards the longitudinal axis 2 of the valve, permits exact and simple positioning of the spray end 3 with respect to the mixing line 12 and an exact design of the gas gap 16.
  • the device according to the invention has an injection for one Fuel-gas mixture has a compact design.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Les dispositifs connus d'injection d'un mélange de carburant et de gaz présentent le risque d'avoir un jet de carburant asymétrique du au gaz introduit, et par conséquent une formation défectueuse du mélange. Le nouveau dispositif présente une soupape d'injection de carburant (1), dont l'extrémité d'injection (3) repose contre une surface d'appui (6) de l'alésage longitudinal (5) du logement (4) de la soupape. Entre l'extrémité (3) et la surface d'apui (6), il est prévu un canal annulaire (15) pour la circulation du gaz, d'où partent au moins deux fentes (16) pour le gaz présentant des ouvertures (19) débouchant les unes en face des autres dans le conduit de mélange (12). L'alimentation symétrique du gaz vers le jet de carburant injecté dans l'axe du dispositif entraîne la formation d'un mélange carburant-gaz parfaitement homogène. Ce dispositif convient notamment à des moteurs à combustion interne à allumage commandé du mélange comprimé.

Claims (6)

  1. Dispositif d'injection d'un mélange carburant-gaz dans une tubulure d'aspiration d'un moteur à combustion interne, dans lequel :
    - un injecteur de carburant comporte un siège fixe (8) coopérant avec un obturateur (9) et, en aval du siège, au moins un orifice de projection (10) situé sur une extrémité de sortie,
    - un logement (4) de l'injecteur, entourant celui-ci au moins au niveau de son extrémité de sortie, comporte un alésage longitudinal à gradin, coaxial à l'injecteur, présentant une surface sur laquelle s'appuie l'extrémité de sortie de l'injecteur,
    - en aval de l'extrémité de sortie de la pulvérisation se trouve un tube de mélange (12) dans lequel le carburant est projeté par l'injecteur et qui est reliée, en amont, par l'intermédiaire d'une fente (16) formée entre l'extrémité de sortie et la surface sur laquelle elle s'appuie, à un canal annulaire (15) raccordé à une source de gaz, caractérisé par le fait que du canal annulaire de gaz (15) partent au moins deux fentes de gaz (16) distinctes sur toutes leurs longueurs et débouchant dans la canalisation du mélange (12) par des orifices (19) situés face à face.
  2. Dispositif selon la revendication 1, caractérisé en ce que deux fentes de gaz (16) partent du canal annulaire.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les axes médians (17) de deux fentes de gaz (16) débouchant face à face par des orifices (19) dans la canalisation de mélange (12), sont situés dans un plan passant par l'axe longitudinal (2) de l'injecteur.
  4. Dispositif selon une des revendications 1 à 3, caractérisé en ce que le canal annulaire de gaz (15) a la forme d'au moins un demi-cercle.
  5. Dispositif selon une des revendications précédentes, caractérisé en ce que la surface d'appui (5) appartenant à l'alésage longitudinal (5) et l'extrémité de sortie (3) de l'injecteur ont la forme de troncs de cône dont le diamètre va diminuant en direction de l'axe longitudinal (2) de l'injecteur.
  6. Dispositif selon une des revendications précédentes, caractérisé en ce que de la conduite de mélange (12) part une fente de régulation (30), située entre l'extrémité de sortie de la pulvérisation (3) et la surface d'appui (6) du logement (4).
EP91906604A 1990-05-04 1991-04-04 Dispositif d'injection d'un melange de carburant et de gaz Expired - Lifetime EP0482136B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4014245 1990-05-04
DE4014245A DE4014245A1 (de) 1990-05-04 1990-05-04 Vorrichtung zur einspritzung eines brennstoff-gas-gemisches
PCT/DE1991/000283 WO1991017358A1 (fr) 1990-05-04 1991-04-04 Dispositif d'injection d'un melange de carburant et de gaz

Publications (2)

Publication Number Publication Date
EP0482136A1 EP0482136A1 (fr) 1992-04-29
EP0482136B1 true EP0482136B1 (fr) 1995-08-02

Family

ID=6405659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91906604A Expired - Lifetime EP0482136B1 (fr) 1990-05-04 1991-04-04 Dispositif d'injection d'un melange de carburant et de gaz

Country Status (6)

Country Link
US (1) US5161511A (fr)
EP (1) EP0482136B1 (fr)
JP (1) JP3365631B2 (fr)
AU (1) AU7550991A (fr)
DE (2) DE4014245A1 (fr)
WO (1) WO1991017358A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5632253A (en) * 1996-04-17 1997-05-27 Paul; Marius A. Universal combustion system
US6666192B2 (en) 2001-11-14 2003-12-23 Delphi Technologies, Inc. Fluid control valve and system

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2623786A (en) * 1948-10-01 1952-12-30 Rudolf L Wille Method for atomizing fuel and nozzle for carrying out this method
JPS58195058A (ja) * 1982-05-07 1983-11-14 Toyota Motor Corp 燃料噴射式内燃機関のエアアシスト装置
DE3609798A1 (de) * 1985-03-27 1986-10-02 Volkswagen AG, 3180 Wolfsburg Kraftstoffeinspritzeinrichtung
US4708117A (en) * 1986-04-14 1987-11-24 Colt Industries Inc. Multi-point fuel injection apparatus
US4982716A (en) * 1988-02-19 1991-01-08 Toyota Jidosha Kabushiki Kaisha Fuel injection valve with an air assist adapter for an internal combustion engine
DE3808396C2 (de) * 1988-03-12 1995-05-04 Bosch Gmbh Robert Kraftstoffeinspritzventil
FR2635827B1 (fr) * 1988-08-30 1993-11-26 Solex Dispositif d'injection de combustible a chambre d'aeration
JP2848491B2 (ja) * 1988-11-16 1999-01-20 株式会社日立製作所 燃料噴射制御装置
US5102054A (en) * 1989-04-12 1992-04-07 Fuel Systems Textron Inc. Airblast fuel injector with tubular metering valve
JPH03107568A (ja) * 1989-09-22 1991-05-07 Aisin Seiki Co Ltd 燃料噴射装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WO 91/12427 *

Also Published As

Publication number Publication date
JP3365631B2 (ja) 2003-01-14
US5161511A (en) 1992-11-10
DE59106134D1 (de) 1995-09-07
DE4014245A1 (de) 1991-11-07
EP0482136A1 (fr) 1992-04-29
AU7550991A (en) 1991-11-27
JPH04507128A (ja) 1992-12-10
WO1991017358A1 (fr) 1991-11-14

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