WO2019201532A1 - Ensemble buse pour injecteur de carburant, injecteur de carburant - Google Patents

Ensemble buse pour injecteur de carburant, injecteur de carburant Download PDF

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Publication number
WO2019201532A1
WO2019201532A1 PCT/EP2019/056807 EP2019056807W WO2019201532A1 WO 2019201532 A1 WO2019201532 A1 WO 2019201532A1 EP 2019056807 W EP2019056807 W EP 2019056807W WO 2019201532 A1 WO2019201532 A1 WO 2019201532A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
nozzle needle
nozzle assembly
injection openings
needle
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.)
Ceased
Application number
PCT/EP2019/056807
Other languages
German (de)
English (en)
Inventor
Andreas Koeninger
Till DICKMANN
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
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO2019201532A1 publication Critical patent/WO2019201532A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • 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
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • Nozzle assembly for a fuel injector, fuel injector
  • the invention relates to a nozzle assembly for a fuel injector with the Wish of the preamble of claim 1. Further, the invention relates to a fuel injector with such a nozzle assembly.
  • the fuel injector is used to introduce a gaseous and a liquid fuel in a combustion chamber of an internal combustion engine.
  • the gaseous fuel may be, in particular, natural gas ("natural gas", abbreviated "NG").
  • natural gas direct injection natural gas is injected directly into a combustion chamber of an internal combustion engine, ignited by means of a previously issued diesel pilot injection and then burned diffusively.
  • the combustion of natural gas has the advantage over conventional diesel combustion, in particular, that the C0 2 emissions can be reduced by up to 25%.
  • natural gas has a diesel-like combustion and thus torque characteristic, so that the degree of integration into existing diesel drive systems is high. This means that usually only minor changes to the internal combustion engine, cooling system and / or exhaust aftertreatment system are required.
  • a so-called two-fuel or dual-fuel injector ver can be used for the direct injection of natural gas and diesel fuel into the combustion chamber of an internal combustion engine.
  • This may, for example, have two coaxially arranged, in each case ge introduced nozzle needles, wherein the outer nozzle needle at least one blow opening for introducing or blowing the natural gas and the inner nozzle needle controls at least one injection port for introducing or injecting the diesel fuel.
  • a dual-fuel injector for example, from the disclosure DE 10 2014 225 167 Al known.
  • Object of the present invention is to provide a nozzle assembly for a Kraftstoffin injector for introducing a gaseous and a liquid fuel in a combustion chamber of an internal combustion engine, the - depending on the mode of the internal combustion engine - an optimization of the injection quantity of the liquid fuel made light. In this way, a further increase in efficiency in the combustion of fuels is to be achieved.
  • the proposed nozzle assembly for a fuel injector for introducing a gaseous and a liquid fuel into a combustion chamber of a Brennkraftma machine comprises a nozzle body and two coaxially arranged nozzle needles.
  • the at least partially designed as a hollow needle outer nozzle needle controls there in the introduction of the gaseous fuel via at least one injection opening.
  • the inner nozzle needle controls the introduction of the liquid fuel through at least one injection port.
  • a plurality of injection openings form a first pitch circle and one at an axial distance from the first pitch circle angeord Neten second pitch circle. Accordingly, different total opening cross sections for injecting the liquid fuel can be released via the inner nozzle needle or the opening stroke of the inner nozzle needle. Because depending on the opening stroke of the inner nozzle needle either only the first bolt circle or both bolt holes are released.
  • the provision of different total opening cross-sections has the advantage that the injection quantity of the liquid fuel varies and thus can be optimally adapted to the respective requirement or to the operating mode of the internal combustion engine.
  • the injection quantity can be reduced to the minimum amount required to ignite the gasförmi conditions fuel. This means that very high levels of gas can be achieved, which are accompanied by an increase in efficiency. If the internal combustion engine to be operated exclusively with liquid fuel, for example in a cold start or emergency operation, by releasing both hole circles, the injection quantity can be significantly increased.
  • a further optimization of the injection quantity can be achieved via the respective number, size and / or shape of the injection openings of a bolt circle. This can at the same time the breaking and penetration behavior of the liquid fuel jets can be improved.
  • the first and second bolt holes forming injection openings are preference, formed in the outer nozzle needle.
  • the outer nozzle needle separates in the case, the gas sector from the liquid fuel area, so that no additional design measures to separate both areas are required.
  • the outer nozzle needle forms a closed dome, which projects beyond the nozzle body in the axial direction Rich.
  • the first and second hole circle forming injection openings may be formed in the nozzle body. The separation of the gas region from the liquid fuel region is in this case alone via a Sealing contact of the outer nozzle needle causes with the nozzle body. If necessary, further design measures for safe media separation are required.
  • the first bolt circle is arranged in the region of a sealing seat for the inner Düsenna del. If the inner nozzle needle is in its sealing seat, the injection openings of the first pitch circle are closed.
  • the sealing seat is conically shaped, so that over the opening stroke of the inner nozzle needle, a fast Wegentdrosselung can be achieved.
  • the sealing seat for the inner nozzle needle is preferential, formed by the outer nozzle needle.
  • the second bolt circle is preferably arranged in the region of a blind hole formed by the outer nozzle needle or by the nozzle body into which the inner nozzle needle dips. In this way, a sufficiently large axial distance between the two hole circles can be realized, which allows the stepwise opening of the inner nozzle needle.
  • the inner nozzle needle has a preferably co nical sealing contour and an end-side pin.
  • the preferably conical sealing contour of the inner nozzle needle cooperates with the preferably conical sealing seat, which is formed by the outer nozzle needle. This ensures that the injection openings of the first pitch circle are securely closed.
  • the further proposed end-side pin preferably connects via a ringförmi gene paragraph to the sealing contour of the inner nozzle needle, so that the pin has a relation to the sealing contour reduced diameter.
  • the pin dips into the blind hole and closes the injection openings of the second pitch circle.
  • the pin forms for this purpose preferably a further sealing contour, which is preferably cylindrical in shape.
  • the cylindrical shape of the further sealing contour ensures that the injection openings of the second pitch circle initially remain closed during an opening stroke of the inner nozzle needle for releasing the injection openings of the first pitch circle.
  • an at least partially conically shaped end portion of the pin can follow, which releases the injection openings of the second bolt circle with continued opening stroke of the inner nozzle needle.
  • the injection openings of the first bolt circle each have a small ren opening cross-section than the injection openings of the second bolt circle. Since the injection openings of the first pitch circle serve primarily the injection of an ignition quantity, the ignition amount can be kept as low as possible in this way.
  • the injection openings of the first bolt circle alone have a total opening cross section Ai and in combination with the injection openings of the second bolt circle a total opening area A 2 .
  • the area ratio A1 / A2 is preferably 15-75%. This ensures that upon release of both bolt holes, the injection quantity of liquid fuel for operation of the internal combustion engine extends.
  • the injection openings of a bolt circle are each arranged at the same angular distance from each other. This measure contributes to a uniform distribution of the liquid fuel in the combustion chamber of the internal combustion engine.
  • the additionally indicated fuel injector for introducing a gaseous and a liquid fuel into a combustion chamber of an internal combustion engine is characterized in that it comprises a nozzle assembly according to the invention.
  • the stu fenweise opening inner nozzle needle of the nozzle assembly according to the invention it allows optimization of the injection quantity of the liquid fuel to ignite either with a very small amount of gaseous fuel or operate with a very large amount of the internal combustion engine.
  • a Effizienzstei delay can be achieved by maximizing the gas content in the gas operation of the internal combustion engine.
  • the liquid fuel is preferably diesel fuel, with the gaseous fuel preferably being natural gas.
  • the proposed fuel injector is preferably designed as an NGDI injector.
  • FIG. 2 a) an enlarged detail of FIG. 1 with the first and second bolt circle closed, b) a diagram for the representation of the volume flow profile, FIG.
  • FIG. 3 a) shows an enlarged detail of FIG. 1 with the first and second closed bolt circle released
  • b) is a diagram for illustrating the volume flow curve
  • FIG. 4 a shows an enlarged detail of FIG. 1 with the first and second bolt circle released
  • Fig. 5 is a schematic longitudinal section through a nozzle assembly according to the invention according to a second preferred embodiment and second
  • Fig. 6 is a schematic longitudinal section through a nozzle assembly according to the invention according to a third preferred embodiment.
  • the nozzle assembly 1 according to the invention for egg nen fuel injector exemplified for introducing a gaseous and a liquid fuel into a combustion chamber 2 of an internal combustion engine comprises a nozzle body 3, in which two coaxially arranged nozzle needles 4, 6 are added.
  • the outer Düsenna del 4 is designed to accommodate the inner nozzle needle 6 as a hollow needle and forms a sealing seat 8 for the inner nozzle needle 6.
  • About the lifting movement of the outer nozzle needle 4 is at least one formed in the nozzle body 3 injection opening 5 for blowing the gaseous fuel releasable and closed again.
  • liquid fuel is injected into the combustion chamber 2 shortly before by means of a pilot injection.
  • the nozzle assembly 1 has a first hole circle 7.1 forming injection openings 7, which are formed in the outer nozzle needle 4 in the region of the sealing seat 8 (see Fig. 2a).
  • the Einspritzöff openings 7 of the first pitch circle 7.1 are released and liquid fuel in the combustion chamber 2 of the internal combustion engine injected (see Fig. 3a).
  • the inner nozzle needle 6 lifts only slightly from the sealing seat 8. Since the sealing seat 8 and a cooperating with the sealing seat 8 sealing contour 10 of the inner nozzle needle 6 are conically shaped ge, this stroke is sufficient to release the injection openings 7 of the first Lochkrei ses 7.1.
  • injection openings 7 of a second bolt circle 7.2 which is formed in an axial distance from the first bolt circle 7.1 in the outer nozzle needle 4, remain closed. Because in the gas operation of the internal combustion engine, the injection quantity is limited to the required amount of ignition. Since these are very small quantities, the injection openings 7 of the first pitch circle 7.1 are dimensioned accordingly small.
  • the nere nozzle needle 6 in an end-side pin 11 which dips into a sealing seat 8 at closing blind hole 9 of the outer nozzle needle 4.
  • the pin 11 has ei ne cylindrical sealing contour 12 and a subsequent thereto conical end portion 13.
  • the cylindrical sealing contour 12 ensures that in a first opening stroke of the inner nozzle needle 6, the injection openings 7 of the second Lochkrei ses 7.2 remain closed. Only when the inner nozzle needle 6 is raised so far that the cylindrical sealing contour 12 having portion of the Zap fens 11 completely emerges from the blind hole 9, the Einspritzöffnun conditions 7 of the second bolt circle 7.2 are released (see Fig. 4a).
  • liquid fuel is injected via the first and the second bolt circle 7.1, 7.2 in the combustion chamber 2, so that the injection quantity is significantly increased. In this way, a cold start of the internal combustion engine or an emergency operation can be realized only with flüssi gem fuel.
  • FIGS. 2a, 3a, and 4a are each associated with FIGS. 2b, 3b and 4b, which represent the volume flow Q as a function of the activation or activation time AD of the inner nozzle needle 6.
  • the diagrams clearly show the stepped opening behavior of the inner nozzle needle 6, wherein in a first stage (FIG. 3b) only the first hole circle 7.1 is released, so that the volume flow Q is low, and in a second th step (Fig. 4b) both hole circles 7.1, 7.2. are released, so that the volume flow Q is maximum.
  • FIG. 5 shows a further preferred embodiment of a nozzle assembly 1 according to the invention.
  • the nozzle body 3 is designed to be closed on the combustion chamber side, so that the blind hole 9 is formed by the nozzle body 3.
  • the sealing seat 8 for the inner nozzle needle 6 is formed as through the outer nozzle needle 4, which surrounds the inner nozzle needle 6 in the region of cooperating with the sealing seat 8 sealing contour 10.
  • the moving surface of the outer nozzle needle 4 acts sealingly with the nozzle body 3 to gether, so that this media separation is effected.
  • FIG. 5 A modification of the embodiment of FIG. 5 is shown in FIG.
  • the injection openings 5 are arranged at a greater axial distance from the injection openings 7.
  • the leakage path between the gas area and the liquid fuel area increases, so that improved media separation is effected.

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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

L'invention concerne un ensemble buse (1) pour un injecteur de carburant pour l'introduction d'un carburant gazeux et d'un carburant liquide dans une chambre de combustion (2) d'un moteur à combustion interne, comprenant un corps de buse (3) et deux aiguilles d'injection (4, 6) disposées coaxialement, l'aiguille d'injection (4) extérieure réalisée au moins en partie comme une aiguille creuse contrôlant l'introduction du carburant gazeux à travers au moins une ouverture d'insufflation (5) et l'aiguille d'injection (6) intérieure contrôlant l'introduction du carburant liquide à travers au moins une ouverture d'injection (7). Selon l'invention, plusieurs ouvertures d'injection (7) forment un premier cercle de trous (7.1) et un deuxième cercle de trous (7.2) disposé à une distance axiale du premier cercle de trous (7.1), de sorte qu'au-dessus de l'aiguille d'injection (6) intérieure différentes coupes transversales d'ouverture globale (A1, A2) peuvent être libérées pour l'injection du carburant liquide. L'invention concerne en outre un injecteur de carburant comprenant un tel ensemble buse (1).
PCT/EP2019/056807 2018-04-20 2019-03-19 Ensemble buse pour injecteur de carburant, injecteur de carburant Ceased WO2019201532A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018206101.7 2018-04-20
DE102018206101.7A DE102018206101A1 (de) 2018-04-20 2018-04-20 Düsenbaugruppe für einen Kraftstoffinjektor, Kraftstoffinjektor

Publications (1)

Publication Number Publication Date
WO2019201532A1 true WO2019201532A1 (fr) 2019-10-24

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ID=66001170

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/056807 Ceased WO2019201532A1 (fr) 2018-04-20 2019-03-19 Ensemble buse pour injecteur de carburant, injecteur de carburant

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DE (1) DE102018206101A1 (fr)
WO (1) WO2019201532A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114353120A (zh) * 2021-12-17 2022-04-15 中国北方发动机研究所(天津) 一种适用于多孔径喷嘴的起伏面导流型燃烧室

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113740047B (zh) * 2021-09-22 2024-04-19 西安航天动力研究所 适用于中心喷嘴组件中外喷嘴的通用型液流试验装置
DE102023135721A1 (de) * 2023-12-19 2025-06-26 Man Energy Solutions Se Kraftstoffinjektor einer Brennkraftmaschine und Brennkraftmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212142A1 (de) * 2013-06-25 2015-01-08 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
DE102014225167A1 (de) 2014-12-08 2016-06-09 Robert Bosch Gmbh Kraftstoffzumessventil für eine Brennkraftmaschine und Verfahren zum Betreiben desselben
CA2883286A1 (fr) * 2015-02-27 2016-08-27 Westport Power Inc. Injecteur de carburant
DE102015220375A1 (de) * 2015-10-20 2017-04-20 Robert Bosch Gmbh Kraftstoffinjektor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013212142A1 (de) * 2013-06-25 2015-01-08 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
DE102014225167A1 (de) 2014-12-08 2016-06-09 Robert Bosch Gmbh Kraftstoffzumessventil für eine Brennkraftmaschine und Verfahren zum Betreiben desselben
CA2883286A1 (fr) * 2015-02-27 2016-08-27 Westport Power Inc. Injecteur de carburant
DE102015220375A1 (de) * 2015-10-20 2017-04-20 Robert Bosch Gmbh Kraftstoffinjektor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114353120A (zh) * 2021-12-17 2022-04-15 中国北方发动机研究所(天津) 一种适用于多孔径喷嘴的起伏面导流型燃烧室
CN114353120B (zh) * 2021-12-17 2023-04-25 中国北方发动机研究所(天津) 一种适用于多孔径喷嘴的起伏面导流型燃烧室

Also Published As

Publication number Publication date
DE102018206101A1 (de) 2019-10-24

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