EP0612374B1 - Gicleur d'alimentation en carburant avec injection d'additif pour moteurs diesel - Google Patents

Gicleur d'alimentation en carburant avec injection d'additif pour moteurs diesel Download PDF

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Publication number
EP0612374B1
EP0612374B1 EP93918898A EP93918898A EP0612374B1 EP 0612374 B1 EP0612374 B1 EP 0612374B1 EP 93918898 A EP93918898 A EP 93918898A EP 93918898 A EP93918898 A EP 93918898A EP 0612374 B1 EP0612374 B1 EP 0612374B1
Authority
EP
European Patent Office
Prior art keywords
additive
space
fuel
interspace
injection
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
EP93918898A
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German (de)
English (en)
Other versions
EP0612374A1 (fr
Inventor
Walter Teegen
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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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0612374A1 publication Critical patent/EP0612374A1/fr
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Publication of EP0612374B1 publication Critical patent/EP0612374B1/fr
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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a fuel injector Additive injection for diesel engines according to the preamble of the claim 1.
  • the fuel in two separate periods and in between that Inject additive, for example water, into the combustion chamber.
  • the known for performing this method has an injector Antechamber for dividing the pre-injection quantity and a pressure chamber, in the the inlet channel for the fuel and the inlet channel for the Additive open ( Figure 4), or an annular channel that the additive inlet bore connects to the fuel inlet bore ( Figure 3).
  • an amount of additive is added to the pressure chamber or pressed into the inlet bore and temporarily stored there.
  • the intermediate amount of additive is then of the high-pressure fuel after displacement and injecting the pre-injection quantity into the combustion chamber before the injection of the main amount of fuel injected.
  • the fuel injector according to the invention with the Features of claim 1 has the advantage that the required Additive quantity stored in the correct stratification with every work cycle and is injected. Furthermore, their structure and operation very easy.
  • the measures specified in the subclaims are advantageous Developments of the injection nozzles specified in claim 1 possible.
  • the training according to claim 2 enables targeted supply and concentrated intermediate storage of the additive in the space.
  • a simple manufacture of the vestibule and the Gap is given by the training according to claim 4.
  • FIG. 1 An embodiment of the invention is shown in the drawing and is described in more detail below. It shows the figure 1 the combustion chamber side half of an injection nozzle in axial section, Figure 2 shows the part of the nozzle body and the valve needle on the combustion chamber side the injection nozzle of Figure 1 in axial section in an enlarged Scale and Figures 3 and 4 a development of part of the nozzle needle 1 and 2 in the area of the mouth of the inlet channel.
  • a nozzle body 1 is interposed with a union nut 2 an intermediate disk 3 on a nozzle holder 4 (only partially shown) clamped in a spring 5 in a closing spring 6 is arranged.
  • a valve needle 11 is displaceable, which near the end of the combustion chamber has a closing cone 12, upstream thereof a pressure shoulder 13 and then a guide section 14, and from the closing spring 6 via a pressure pin 15 and a pressure pin 16 with the locking cone 12 against a conical Valve seat 17 at the combustion chamber end of the nozzle body 1 is pressed.
  • a throttle bore 18 follows the combustion chamber a throttle pin 19 passes through the valve needle 11.
  • the pressure shoulder 13 of the nozzle needle 11 is from an annular pressure chamber 21 surrounded in the nozzle body 1, in which the inlet bore 7 for the Main fuel flows out. Downstream of the pressure chamber 21 closes Valve seat 17 towards an extension section 22 of the longitudinal bore 9 and thereupon a conical bore 23, of which the throttle bore 18 closer Section forms the valve seat 17.
  • valve needle 11 Upstream of the closing cone 12 interacting with the valve seat 17 the valve needle 11 is arranged a preliminary storage or antechamber 25, that of an annular recess 24 in the conical nozzle needle formed tip and delimited radially outside by the tapered bore 23 is. Between the antechamber 25 and the pressure chamber 21 is a Space 26 is provided, the radially inside of a constriction 27 in the valve needle 11 and outside of the extension section 22 the longitudinal bore 9 of the nozzle body 1 is limited. In the closed position the valve needle 11 is the space 26 to Pressure chamber 21 connected via an annular throttle gap 28, the from the end part 29 of the extension section close to the pressure chamber 21 22 and of the part 30 of the constriction 27 of the Shank of the valve needle 11 is limited.
  • Throttle gap 31 the space 26 with the vestibule 25, the Throttle gap 31 on the one hand from the transition 32 of the extension section 22 in the tapered bore 23 and on the other hand by a collar 33 between the constriction 27 and the recess 24 in the valve needle 11 is formed.
  • the two throttle gaps 28 and 31 are in the only effective in the closed position of the valve needle 11. At the Lifting the valve needle 11 from the valve seat 17 move the surfaces forming the choke gaps 28 and 31 relative to one another, the throttling effect between the individual rooms 21, 26 and 25 is increasingly picking up.
  • a plurality, preferably four, radial bores 35 which are axial Blind bore 36 in the stem 20 of the valve needle 11 go out.
  • the axial Bore 36 is about transverse bores 37 with a recess 38 in Nozzle body 1 in connection, in which the inlet channel 8 opens.
  • in the Inlet channel 8 blocks a check valve 39 the backflow of Additive.
  • the first inlet channel 7 is via a pressure line 41 and a relief valve 42 with an injection pump 43 for the main fuel, for example diesel oil, and the second inlet channel 8 through an inlet line 44 with a low pressure pump 45 for the Additive, for example water.
  • the described injector works as follows: After each injection phase, when the valve needle 11 is again in the closed position, the pressure chamber 21, the intermediate space 26 and the antechamber 25 are filled with main fuel. The pre-injection quantity is thus determined by the volume of the antechamber 25, which is adapted to the combustion requirements of the respective engine. In each case between two injection phases, a small predetermined amount of liquid additive is measured by the low-pressure pump 45 and conveyed through the inlet channel 8, the axial bore 36 and the radial bores 35 into the intermediate space 26. The inflowing amount of additive displaces the main fuel remaining there from the previous injection phase against the direction of flow into the pressure chamber 21.
  • the throttle gap 31 supports the separate remaining of a fuel storage quantity, which is necessary as an ignition quantity, in the antechamber 25 and the throttle gap 28 favors extensive distribution of the metered amount of additive (FIG. 2).
  • the main fuel is forced back by the relief valve 42.
  • the throttle gap 28 also acts on the resulting compression flow by first of all a better distribution of the main fuel in the pressure chamber 21 before the opening pressure is reached.
  • FIGS. 3 and 4 show, by arranging one more or a smaller number of radial bores opening into the pressure chamber 26 35, the distance between the individual radial bores 35 is influenced by each other, through which the additive in the space 26 flows, a completely closed intermediate layer made of additives be formed (Figure 3), or it can also be isolated Small amounts can be stored in the main fuel ( Figure 4). in the in the latter case, a mixture of additive is formed in the intermediate space 26 and fuel that mixes intensively when injected. Each one or the other configuration is selected as required by the engine.
  • the invention is based on a so-called throttle pin injection nozzle explained in which a pin on the valve needle in the spray hole protrudes. It can also be used with so-called perforated nozzles which spray jets are formed in spray holes with a small cross-section will.

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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

Un gicleur d'alimentation en carburant pour moteurs à combustion interne est conçu pour injecter un volume d'additif entre un volume de préinjection et un volume principal d'injection de carburant, afin de favoriser le fonctionnement sans à-coup et le processus de combustion du moteur. Afin d'assurer une séparation reproductible du volume d'additif, du volume de préinjection comme du volume principal d'injection de carburant, le gicleur comporte une chambre intermédiaire (26) pour l'additif liquide, dans un corps d'injecteur (1) entre une chambre de pression (21) et une préchambre (25) pour le carburant principal. Des fentes d'étranglement (28, 31) séparent la chambre intermédiaire (26) de la préchambre (25) et de la chambre de pression (21) lorsque l'aiguille de la soupape (1) est en position fermée, lorsqu'un volume d'additif est amené dans la chambre d'additif, ce qui déplace le carburant principal dans la chambre de pression (21). L'additif est acheminé dans la chambre intermédiaire (26) en passant par un canal d'amenée (36) axial et par des alésages radiaux (35) pratiqués dans l'aiguille de l'injecteur (11).

Claims (4)

  1. Injecteur de carburant pour moteur à combustion interne avec injection complémentaire d'un additif entre la préinjection et l'injection principale du carburant, comprenant :
    un corps d'injecteur (1) muni d'un siège de soupape (17) dans sa partie située du côté de la chambre de combustion et en amont de celle-ci une chambre de pression (21),
    une aiguille d'injecteur (11) coulissant dans le corps (1) et chargée dans le sens de la fermeture, cette aiguille ayant un siège d'étanchéité (12) coopérant avec le siège de soupape (17), et comportant un épaulement de pression (13) à la hauteur de la chambre de pression (21),
    une antichambre (25) entre le siège de soupape (17) et la chambre de pression (21) pour recevoir une quantité de préinjection et,
    un canal d'alimentation (7) conduisant à la chambre de pression (21) pour le carburant et un canal d'alimentation (8) pour l'additif, pour recevoir de manière intermédiaire une quantité d'additif entre la quantité de préinjection et la quantité principale d'injection,
    caractérisé par
    une chambre intermédiaire (26) entre la chambre de pression (21) et l'antichambre (25), cette chambre intermédiaire étant délimitée radialement par l'aiguille d'injecteur (11) et par un segment de prolongement (22) d'un perçage longitudinal (9) guidant axialement l'aiguille (11) dans le corps d'injecteur (1), le canal d'alimentation (8) pour l'additif débouchant dans cette chambre intermédiaire qui peut être reliée à la chambre de pression (21) et à l'antichambre (25) par des points d'étranglement (28, 31) commandés à l'ouverture, pour être traversés par la quantité d'injection principale,
    la quantité d'additif qui arrive dans la chambre intermédiaire (26) lorsque l'aiguille (11) en position de fermeture, refoule le carburant résiduel qui se trouve dans la chambre intermédiaire (26) vers la chambre de pression (21), lorsque la liaison entre la chambre intermédiaire (26) vers la chambre de pression (21) et l'antichambre (25) est étranglée, et
    lorsque l'aiguille (11) se soulève du siège (17), l'effet d'étranglement entre la chambre intermédiaire (26) et la chambre de pression (21) ainsi que la chambre intermédiaire (26) et l'antichambre (25) disparaít.
  2. Injecteur de carburant selon la revendication 1,
    caractérisé en ce que
    le canal d'alimentation (8) fournissant l'additif se trouve en partie dans l'aiguille d'injecteur (11) et débouche dans la chambre intermédiaire (26) à travers des perçages radiaux (35).
  3. Injecteur de carburant selon l'une des revendications 1 et 2,
    caractérisé en ce que
    l'antichambre (25) et la chambre intermédiaire (26) sont formées par des cavités annulaires (27, 24) à la périphérie de l'aiguille d'injecteur (11) et sont séparées l'une de l'autre par une collerette (33) dont la périphérie délimite un point d'étranglement (31).
  4. Injecteur de carburant selon la revendication 3,
    caractérisé en ce que
    les perçages radiaux (35) de l'aiguille (11) de l'injecteur débouchent dans la chambre intermédiaire (26) à proximité de la collerette (33).
EP93918898A 1992-09-12 1993-08-20 Gicleur d'alimentation en carburant avec injection d'additif pour moteurs diesel Expired - Lifetime EP0612374B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4230641A DE4230641A1 (de) 1992-09-12 1992-09-12 Kraftstoff-Einspritzdüse mit Additiveinspritzung für Dieselmotoren
DE4230641 1992-09-12
PCT/DE1993/000755 WO1994007020A1 (fr) 1992-09-12 1993-08-20 Gicleur d'alimentation en carburant avec injection d'additif pour moteurs diesel

Publications (2)

Publication Number Publication Date
EP0612374A1 EP0612374A1 (fr) 1994-08-31
EP0612374B1 true EP0612374B1 (fr) 1998-01-07

Family

ID=6467869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93918898A Expired - Lifetime EP0612374B1 (fr) 1992-09-12 1993-08-20 Gicleur d'alimentation en carburant avec injection d'additif pour moteurs diesel

Country Status (5)

Country Link
US (1) US5438966A (fr)
EP (1) EP0612374B1 (fr)
JP (1) JP3536078B2 (fr)
DE (2) DE4230641A1 (fr)
WO (1) WO1994007020A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4421714A1 (de) * 1994-06-21 1996-01-04 Bosch Gmbh Robert Kraftstoffeinspritzsystem
DE19535703C2 (de) * 1995-09-26 1997-07-31 Mtu Friedrichshafen Gmbh Brennstoffeinspritzsystem
US5713328A (en) * 1997-03-31 1998-02-03 Ford Global Technologies, Inc. Spark ignited internal combustion engine with multiple event fuel injection
DE19738397A1 (de) * 1997-09-03 1999-03-18 Bosch Gmbh Robert Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE19746489A1 (de) * 1997-10-22 1999-04-29 Bosch Gmbh Robert Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE19754515A1 (de) 1997-12-09 1999-06-10 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19955344B4 (de) * 1999-11-17 2005-08-18 Robert Bosch Gmbh Baugruppe aus einem Kraftstoff-Einspritzventil und einem Modul zur Wasser-Einspritzung in einen Zylinder einer Verbrennungskraftmaschine
DE10156657C2 (de) * 2001-11-17 2003-12-04 Daimler Chrysler Ag Zweistoff-Injektor
US20090236442A1 (en) * 2007-12-10 2009-09-24 Tdc Products B.V. Injection device for an internal combustion engine
CA2635410C (fr) * 2008-06-19 2010-08-17 Westport Power Inc. Double connecteur a carburants
US20110030635A1 (en) * 2009-08-04 2011-02-10 International Engine Intellectual Property Company, Llc Fuel injector nozzle for reduced coking
JP6203727B2 (ja) 2011-09-07 2017-09-27 アフトン・ケミカル・コーポレーションＡｆｔｏｎ Ｃｈｅｍｉｃａｌ Ｃｏｒｐｏｒａｔｉｏｎ 空気輸送エンジン添加剤送達システム
DE102017218869A1 (de) * 2017-10-23 2019-04-25 Robert Bosch Gmbh Injektor

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DE495611C (de) * 1924-09-09 1930-04-09 Motorenfabrik Deutz Akt Ges Verfahren zur Einfuehrung von Zuendoel vor dem Treiboel bei Dieselmaschinen mit luftloser Einspritzung
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US4481921A (en) * 1982-05-26 1984-11-13 Nippondenso Co., Ltd. Fuel injection apparatus of internal combustion engine
DE3243175C2 (de) * 1982-11-23 1986-06-19 Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt e.V., 5000 Köln Kraftstoff-Einspritzventil
JPS61171874A (ja) * 1985-01-28 1986-08-02 Nippon Denso Co Ltd ２種燃料噴射装置
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JP2772114B2 (ja) * 1990-05-23 1998-07-02 三菱重工業株式会社 水噴射ディーゼルエンジン
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US5365902A (en) * 1993-09-10 1994-11-22 General Electric Company Method and apparatus for introducing fuel into a duel fuel system using the H-combustion process

Also Published As

Publication number Publication date
US5438966A (en) 1995-08-08
JP3536078B2 (ja) 2004-06-07
WO1994007020A1 (fr) 1994-03-31
EP0612374A1 (fr) 1994-08-31
JPH07501376A (ja) 1995-02-09
DE59307944D1 (de) 1998-02-12
DE4230641A1 (de) 1994-03-17

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