WO2008017544A1 - Système d'injection de carburant avec un amortisseur de vibrations de pression - Google Patents

Système d'injection de carburant avec un amortisseur de vibrations de pression Download PDF

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Publication number
WO2008017544A1
WO2008017544A1 PCT/EP2007/056814 EP2007056814W WO2008017544A1 WO 2008017544 A1 WO2008017544 A1 WO 2008017544A1 EP 2007056814 W EP2007056814 W EP 2007056814W WO 2008017544 A1 WO2008017544 A1 WO 2008017544A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
fuel
injection system
fuel injection
vibration damper
Prior art date
Application number
PCT/EP2007/056814
Other languages
German (de)
English (en)
Inventor
Le-Thanh-Son Tran
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 WO2008017544A1 publication Critical patent/WO2008017544A1/fr

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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations

Definitions

  • the present invention relates to a fuel injection system with a pressure vibration damper according to the closer defined in the preamble of claim 1. Art.
  • Such a fuel injection system includes a high pressure source for delivering the high pressure fuel to at least one fuel injector, the high pressure source communicating with at least one fuel injector via a fuel pressure line and the pressure dampening damper disposed within the fuel pressure line.
  • Such a fuel injection system is known from DE 10 2004 016 508 Al.
  • a high-pressure pump is provided, which with a plurality of
  • Fuel injectors is connected via a fuel pressure line.
  • the fuel injectors are each connected to the fuel pressure line, wherein in the immediate vicinity of each injector, a pressure vibration damper is arranged in the form of a throttle.
  • This has a flow resistance which is greater in the return direction of the high-pressure pump than in the flow direction to the respective Einspritzöffhung, wherein in the fuel pressure line at least a second throttle is provided as a pressure vibration damper.
  • This arrangement of a pressure vibration damper which is based on the principle of the throttle with a narrowed flow cross-section, has the disadvantage that there is a high flow resistance and thereby high pressure losses and
  • the invention includes the technical teaching that the pressure vibration damper has a tubular conduit section for passage of the fuel, in which at least one radial throttle bore for discharging fuel is provided in a pressure damping chamber.
  • the advantage of the embodiment of the pressure vibration damper according to the invention lies ostensibly in an unimpeded flow of the fuel through the pressure vibration damper, without pressure losses and system line losses being caused.
  • the proposed Pressure vibration damper is not based on the principle of flow restriction, which causes a high flow resistance and does not unnecessarily throttle the fuel allocation from the high pressure source to the fuel injectors.
  • the flow cross-section of the tubular line section may, for example, have the same or at least a similar flow cross-section as the
  • Damping room forms Due to the design of the pressure vibration damper in a housing, this is carried out separately and can be arranged arbitrarily within the fuel injection system.
  • the pressure vibration damper thus forms a structurally independent unit, wherein the dimensions of the pressure vibration damper are limited to the dimensions of the housing substantially.
  • the line section extends through the housing, and the pressure damping chamber surrounds the line section.
  • the housing, the line section and the damping chamber is formed radially symmetrically about a common axis of symmetry around, wherein the arrangement of housing, damping chamber and line section can also be eccentric, and thus not radially symmetrical.
  • This can also be a damping chamber are formed, which is present on only one side of the line section.
  • the pressure vibration damper forms a cylindrical shape, so that it can be integrated within the fuel pressure line in the form of a coupling piece or the like.
  • a further advantageous embodiment of the invention provides that the pressure damping chamber in the direction of the axis of symmetry is pressure-tightly sealed at least at one end side by means of a connecting piece. Preferably, both on the input side, ie on the side of the fuel supply line and at the
  • Output side i. be provided on the side of the derivative of the fuel from the line section a connector.
  • integrally constructing at least one connecting piece with the housing so that the pressure damping space is introduced as a bore in the direction of the symmetry axis from the opposite side into the housing with a single separate connecting piece.
  • a seal may be provided, which is introduced as a ring seal within a sealing seat in the housing.
  • the orifices within the conduit section may be equally spaced along the length of the conduit section, either in a radial position or at various radial positions and in various longitudinal sections, which bores may be cylinder bores or bores extending over their length, i. the wall thickness of the line section have a variable cross-section.
  • the line section 1-10 preferably 3-7 and more preferably 4 radial throttle bores.
  • the conduit section extends through the entire length of the housing through this, whereas the pressure damping chamber can be formed only over a portion of the housing length.
  • the number of throttle bores relates to the section of the line section which is surrounded by a pressure damping chamber.
  • the throttle bores may be circumferentially formed on the conduit section in various radial directions, or located in a plane opposite the conduit section.
  • the throttle bores have a diameter of 0, 1 mm to 1 mm, preferably from 0.2 mm to 0.5 mm and particularly preferably of 0.3 mm.
  • a bore generally describes a passage or opening without being limited to production by means of a drill.
  • the holes can be introduced, for example, in the erosion process, in the stamping process or in the laser cutting process in the tubular line section.
  • this may comprise a high pressure accumulator, which is arranged between the high pressure source and the at least one Kraftstoff ⁇ njektor.
  • High-pressure accumulator is also referred to as a common rail, which comprises a volume within which the fuel is stored with the appropriate high pressure.
  • a common rail which comprises a volume within which the fuel is stored with the appropriate high pressure.
  • High-pressure source connected which may include a high-pressure pump.
  • the delivery strokes of a high-pressure pump create pressure surges that travel through the high-pressure lines and reflect on the rail system and on the pump itself. This creates pressure oscillations in the pump rail lines, which lead to increased pump element pressure. Therefore, it is provided according to the invention that the pressure vibration damper is arranged between the high-pressure source and the high-pressure accumulator.
  • the pressure vibration damper is arranged between the high-pressure source and the high-pressure accumulator.
  • the pressure vibration damper between the high-pressure accumulator and the Kraftstoff ⁇ njektor is arranged.
  • This can be arranged in each of the fuel pressure lines, which runs between the high-pressure accumulator and the respective Kraftstoff ⁇ njektor, so that the fuel first flows through the pressure vibration damper before it reaches the Kraftstoff ⁇ njektor.
  • both a pressure vibration damper between the high-pressure source and the high-pressure accumulator is arranged and at the same time in a respective fuel pressure line to the fuel injectors further pressure dampers are used.
  • the pressure swing damper may be disposed within the fuel injection system as a separate component within the fuel pressure line, with the possibility also that the pressure swing damper be mechanically connected to the fuel injector, i. For example, is screwed, or is used depending on the place of use mechanically with the high pressure source or on the input side or on the respective output side of the common rail.
  • Figure 1 is a schematic representation of a pressure vibration damper according to the present invention
  • Figure 2 is a cross-sectional view of a possible embodiment of the pressure swing damper
  • Figure 3 is a schematic representation of a fuel injection system with a
  • Pressure vibration damper which is arranged between the high-pressure source and a high-pressure accumulator;
  • Figure 4 is a schematic representation of another embodiment of a fuel injection system in which between the high-pressure accumulator and the fuel injectors each a pressure vibration damper is disposed within the fuel pressure line.
  • the pressure vibration damper 5 shown in Figure 1 is used within a - not shown here - fuel pressure line.
  • the fuel pressure line will both Fluidly connected on the left side and the right side with a line section 6, so that the fuel flows through the line section 6.
  • the line section 6 is arranged concentrically about an axis of symmetry 10, wherein a cylindrical damping chamber 8 extends around the line section 6 likewise concentric to the symmetry axis 10.
  • the damping chamber 8 is formed by a housing 9, which is radially symmetrical and also concentric with the axis of symmetry 10.
  • the pressure vibration damper 5 forms a cylindrical member, which is either disposed within the fuel pressure line or by means of a both right-hand fitting 11 and a left-side fitting 11 'mechanically with another
  • Component within the fuel injection system such as a high pressure source, a high-pressure accumulator or a fuel injector can be connected.
  • the connecting pieces 11 and 11 ' are likewise formed concentrically around the axis of symmetry 10 and can constitute a connection between the line section 6 and the housing 9. Furthermore, the connecting pieces 11 and 11 'seal the
  • Pressure damping chamber 8 in the direction of the symmetry axis 10 from.
  • the line section 6 has a plurality of radially outwardly extending throttle bores 7.
  • the extension direction of the throttle bores 7 is formed perpendicular to the symmetry axis 10, wherein the throttle bores 7, the inner region of the
  • Line section 6 connect to the region of the pressure damping chamber 8.
  • the throttle bores 7 represent fluid channels through which the fuel can pass from the inside of the line section 6 into the damping chamber 8. If a pressure peak, i. a pressure peak within the conduit section 6, the fuel can pass through the throttle bores 7 into the damping chamber 8.
  • Throttle holes 7 include a small diameter of, for example, 0.3 mm, so that when passing the fuel through the throttle bores 7, a damping effect is achieved.
  • FIG. 2 shows a cross-sectional view of a technical embodiment of the invention
  • the line section 6 extends concentrically around the symmetry axis 10 through the housing 9.
  • the damping chamber 8 is formed concentrically only around a partial length of the housing 9 to the line section 6.
  • the line section 6 comprises eight throttle bores 7, which on the free length of the line section 6 in the Damping chamber 8 open.
  • the line section 6 is added to the left side in a connection piece 11 '. Further, the line section 6 passes through the housing 9 on a portion within which the pressure damping chamber 8 is not yet formed.
  • On the right side of the pressure damping chamber 8 is limited by a sealing element 13, in which the connecting piece 11 'opposite end of the
  • the sealing element 13 is clamped to the right-side connecting piece 11, which is screwed endwise by means of a thread within the housing 9.
  • the connector 11 in turn has an external thread to the
  • Pressure swing damper 5 either fluidly connect to the fuel pressure line, or mechanically connect to at least one further component within the fuel injection system.
  • the pressure vibration damper 5 may be made of a steel material with respect to the components of the housing 9, the connector 11 and 11 'and the line section 6, whereas the
  • Sealing element 13 may be formed, for example, a non-ferrous metal. Thus, fluid pressures in the fuel of one Kbar or even more than two Kbar can be passed through the pressure vibration damper.
  • the volume of the pressure damping chamber 8 can according to the embodiment in
  • the free length of the line section 6 within the housing 9 comprises about 30 mm. Due to the length of the housing 9 of the pressure damping chamber 8 can be increased through a widening of the bore in the direction of the connecting piece 11 ', so that with a free length of the line section 6 within the casing 9 of for example 60 mm, a volume of the pressure damping chamber 8 of 8 cm 3 is feasible.
  • FIG. 3 shows a fuel injection system 1 according to an embodiment of the invention.
  • the fuel injection system 1 comprises a high pressure source 2, which via a fuel pressure line 4 with a high pressure accumulator 12 in
  • the high-pressure accumulator 12 is generally referred to as a common rail, from which the fuel injectors 3 are brought into communication via the respective fuel pressure lines 4.
  • the fuel is provided by the high-pressure source 2 with a corresponding pressure to the high pressure accumulator 12, so that the fuel injectors 3 at a respective Open period of the fuel injectors (3) supply the fuel.
  • a pressure vibration damper 5 is arranged in the fuel pressure line 4 between the high pressure source 2 and the high pressure accumulator 12.
  • pressure surges that migrate through the high-pressure lines and reflect at the high-pressure accumulator 12 and again at the high-pressure source 2 respectively. This results in pressure oscillations within the fuel pressure line 4 between the high pressure source 2 and the high pressure accumulator 12, which lead to increased pump element pressure.
  • the pressure vibration damper 5 causes a damping of these pressure oscillations.
  • Figure 4 shows a schematic representation of another embodiment of the present invention, which in turn shows a fuel injection system 1 with a high pressure source 2, a high-pressure accumulator 12 and a total of four fuel injectors 3.
  • the pressure vibration damper 5 are arranged in the respective fuel pressure line 4 between the high-pressure accumulator 12 and the fuel injectors 3. Pressure oscillations caused by the periodic
  • Opening operations and closing operations of the fuel injectors 3 caused can be attenuated within the fuel pressure line 4 between the fuel injectors 3 and the high-pressure accumulator 12.
  • 12 may be provided between the fuel injectors and the high-pressure accumulator 12 each pressure vibration damper, wherein also within a single system, a further pressure vibration damper 5 can be introduced within the fuel pressure line 4 between the high pressure source 2 and the high pressure accumulator 12.
  • Embodiments Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.

Landscapes

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

Abstract

Système d'injection de carburant (1), comprenant une source à haute pression (2) pour véhiculer le carburant sous haute pression vers au moins un injecteur de carburant (3). L'injecteur de carburant (3) est fluidiquement relié à la source à haute pression (2) par l'intermédiaire d'une conduite de carburant sous pression (4). Au moins un amortisseur (5) de vibrations de pression est disposé dans la conduite de carburant sous pression (4). L'amortisseur (5) de vibrations de pression présente un tronçon de conduite tubulaire (6) pour le passage du carburant, dans lequel est prévu au moins un perçage d'étranglement radial (7) pour dévier le carburant dans une chambre (8) d'amortissement de pression. On obtient ainsi un système d'injection de carburant (1) avec un amortisseur (5) de vibrations de pression qui offre une faible résistance à l'écoulement et qui permet un amortissement suffisant des ondes de pression et des vibrations de conduites qui surviennent à l'intérieur du système d'injection de carburant (1).
PCT/EP2007/056814 2006-08-09 2007-07-05 Système d'injection de carburant avec un amortisseur de vibrations de pression WO2008017544A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006037179.8 2006-08-09
DE200610037179 DE102006037179A1 (de) 2006-08-09 2006-08-09 Kraftstoffeinspritzsystem mit einem Druckschwingungsdämpfer

Publications (1)

Publication Number Publication Date
WO2008017544A1 true WO2008017544A1 (fr) 2008-02-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/056814 WO2008017544A1 (fr) 2006-08-09 2007-07-05 Système d'injection de carburant avec un amortisseur de vibrations de pression

Country Status (2)

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DE (1) DE102006037179A1 (fr)
WO (1) WO2008017544A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019072604A1 (fr) * 2017-10-09 2019-04-18 L'orange Gmbh Injecteur de carburant et système d'injection pour moteur à combustion interne

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010053502A1 (de) 2010-12-04 2012-06-06 Volkswagen Ag Fluid-Pulsationsdämpfer
DE102011076646A1 (de) * 2011-05-27 2012-11-29 Mahle International Gmbh Druckschwingungsdämpfer
DE102014208369A1 (de) * 2014-05-05 2015-11-05 Bayerische Motoren Werke Aktiengesellschaft Kraftstoffleitung für eine Brennkraftmaschine
DE102015218223A1 (de) 2015-09-23 2017-03-23 Robert Bosch Gmbh Druckpulsationsdämpfer für ein Kraftstoffeinspritzsystem sowie Kraftstoffeinspritzsystem
DE102016213948A1 (de) 2016-07-28 2018-02-01 Robert Bosch Gmbh Kraftstoffeinspritzsystem
DE102016214198A1 (de) * 2016-08-02 2018-02-08 Siemens Aktiengesellschaft Überwachung eines Gasdrucks in einem Gasraum

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893128C (de) * 1941-10-01 1953-10-12 Daimler Benz Ag Einspritzvorrichtung mit Brennstoffspeicher fuer Benzin- oder Gasoeleinspritzung beischnellaufenden Motoren
WO1990014549A1 (fr) * 1989-05-24 1990-11-29 Arden Finanz Ag Tuyau souple pour diminuer les pulsations de pression
JPH1030521A (ja) * 1996-07-12 1998-02-03 Denso Corp 燃料噴射装置
EP1030052A1 (fr) * 1998-11-24 2000-08-23 Institut Francais Du Petrole Système d'injection de carburant sous haute pression dans un moteur à combustion interne à injection directe
EP1275841A1 (fr) * 2001-07-10 2003-01-15 Delphi Technologies, Inc. Injecteur de carburant avec amortisseur de pression
EP1770275A1 (fr) * 2005-09-29 2007-04-04 Robert Bosch Gmbh Injecteur à trous avec un volume de retenue pour un dispositif d'injection de carburant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893128C (de) * 1941-10-01 1953-10-12 Daimler Benz Ag Einspritzvorrichtung mit Brennstoffspeicher fuer Benzin- oder Gasoeleinspritzung beischnellaufenden Motoren
WO1990014549A1 (fr) * 1989-05-24 1990-11-29 Arden Finanz Ag Tuyau souple pour diminuer les pulsations de pression
JPH1030521A (ja) * 1996-07-12 1998-02-03 Denso Corp 燃料噴射装置
EP1030052A1 (fr) * 1998-11-24 2000-08-23 Institut Francais Du Petrole Système d'injection de carburant sous haute pression dans un moteur à combustion interne à injection directe
EP1275841A1 (fr) * 2001-07-10 2003-01-15 Delphi Technologies, Inc. Injecteur de carburant avec amortisseur de pression
EP1770275A1 (fr) * 2005-09-29 2007-04-04 Robert Bosch Gmbh Injecteur à trous avec un volume de retenue pour un dispositif d'injection de carburant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019072604A1 (fr) * 2017-10-09 2019-04-18 L'orange Gmbh Injecteur de carburant et système d'injection pour moteur à combustion interne

Also Published As

Publication number Publication date
DE102006037179A1 (de) 2008-02-14

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