EP2203639A1 - Dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant

Info

Publication number
EP2203639A1
EP2203639A1 EP07857303A EP07857303A EP2203639A1 EP 2203639 A1 EP2203639 A1 EP 2203639A1 EP 07857303 A EP07857303 A EP 07857303A EP 07857303 A EP07857303 A EP 07857303A EP 2203639 A1 EP2203639 A1 EP 2203639A1
Authority
EP
European Patent Office
Prior art keywords
fuel
fuel injection
pressure
injection device
injection valve
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.)
Granted
Application number
EP07857303A
Other languages
German (de)
English (en)
Other versions
EP2203639B1 (fr
Inventor
Michael Fischer
Ulrich Fischer
Peter Lang
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 EP2203639A1 publication Critical patent/EP2203639A1/fr
Application granted granted Critical
Publication of EP2203639B1 publication Critical patent/EP2203639B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
    • 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
    • F02M61/165—Filtering elements specially adapted in fuel inlets to injector
    • 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
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/853—Mounting of fuel injection apparatus involving use of quick-acting mechanism, e.g. clips

Definitions

  • the invention relates to a fuel injection device according to the preamble of the main claim.
  • the fuel injection device comprises several
  • Fuel injection valves a receiving bore in the cylinder head for each fuel injection valve and a respective connecting piece of a fuel distributor line, which serves to supply the fuel injection valves with fuel.
  • the fuel injection valve is inserted into the relatively massive connecting piece of the fuel distributor line and sealed by means of a sealing ring.
  • the connecting piece is made in one piece from the actual fuel distributor line.
  • the fuel distribution line is firmly connected to the cylinder head, for example, by screwing. Between the connecting piece of the fuel distributor line and the fuel injection valve, a bow-shaped hold-down device is clamped.
  • the hold-down device has a part-ring-shaped basic element, from which an axially compliant hold-down bar extends, which has at least two webs.
  • the fuel injector is particularly suitable for use in fuel injection systems of mixture-compression spark-ignition internal combustion engines.
  • proportional hydraulic forces are built up against the fuel injection valve and the fuel distributor line via the fuel pressure of the cross-sectional area present in the connecting piece, which can damage the sealing ring and act as structure-borne noise on the Motor structure can be transmitted and thus lead to unwanted sound radiation (Figure 1).
  • the fuel injection device with the characterizing features of claim 1 has the advantage that an improved seal is created by simple measures on the fuel injector and the connecting piece of the fuel rail and a reduced noise is achieved.
  • the dynamic pressure changes in the fuel during opening and closing of the fuel injection valve are largely kept away from the connection piece by being passed through the connection piece directly into the fuel distribution line without triggering dynamic pressure fluctuations in the volume of the connection piece. This is done with a pressure wave guide, which ensures that the formation of dynamic exchange forces is significantly reduced.
  • the result is a reduced wear of the gaskets of the fuel injector and a significantly reduced noise.
  • the slowly changing pressure build-up and dismantling is maintained because at high load conditions, the force generated by the pressure of the
  • the attachment of the pressure waveguide to the fuel rail can be done in particular by means of a snap, snap or clip connection.
  • the pressure waveguide projects through the receiving opening of the connecting piece and a significantly smaller diameter flow opening provided upstream of the receiving opening at least partially, in particular completely. This also applies to the discharge opening in the fuel distribution line.
  • annular leakage gap In the region of the outflow opening of the fuel distributor line or the flow opening of the connecting piece, an annular leakage gap is formed. Further advantageous embodiments of the leakage gap can be configured by contouring the surface of the pressure waveguide. The leakage gap between the pressure waveguide and the wall surrounding it allows a slow pressure buildup and dismantling in the connecting piece according to the system pressure, ie a static pressure equalization.
  • Figure 1 is a partially illustrated fuel injector in a first known embodiment
  • Figure 2 is a partially illustrated fuel injector in a second known embodiment
  • Figure 3 is a partially illustrated fuel injector in a third known embodiment
  • Figure 4 is a partial view of the fuel injector in the field
  • FIG. 5 shows a first embodiment of a pressure waveguide according to the invention
  • FIG. 6 shows a second embodiment of a pressure waveguide according to the invention
  • FIG. 7 shows a third embodiment of a pressure waveguide according to the invention, wherein the pressure waveguides shown in FIGS
  • Figure 8 shows a cross section through a pressure wave guide in the region of
  • FIG. 9 shows a further cross section through a pressure waveguide in the region of a leakage gap and FIG. 10 shows a fourth embodiment of a pressure waveguide according to the invention, this pressure waveguide being suitable for a fuel injection device according to FIG.
  • FIGS. 1 In the figure 1 is shown as an exemplary embodiment, a valve in the form of an injection valve 1 for fuel injection systems of mixture-compression spark-ignited internal combustion engines in a side view.
  • the fuel injection valve 1 is part of the fuel injection device.
  • a sealing ring 2 in particular of Teflon®, ensures optimum sealing of the fuel injection valve 1 with respect to the wall of the cylinder head.
  • the fuel injection valve 1 has at its inlet end 3 a plug connection to a fuel rail (fuel rail) 4, which by a sealing ring 5 between a connecting piece 6 of the fuel distributor line 4, which is shown in section, and an inlet nozzle 7 of the fuel injection valve 1 is sealed.
  • the fuel injection valve 1 is inserted into a receiving opening 12 of the relatively massive connection piece 6 of the fuel distribution line 4.
  • the connecting piece 6 is, for example, in one piece from the actual fuel distributor line 4 and has upstream of the receiving opening 12 a smaller diameter flow opening 15 through which the flow of the fuel injection valve 1 takes place.
  • the fuel injection valve 1 has an electrical connection plug 8 for the electrical contacting for actuating the fuel injection valve 1.
  • a holding-down device 10 is provided between the fuel injection valve 1 and the connecting piece 6.
  • the hold-down 10 is designed as a bow-shaped component, e.g. as punching-bending part.
  • the hold-down device 10 has a part-ring-shaped base element 11, from which a hold-down bar 13 extends, which abuts against a downstream end face 14 of the connecting piece 6 on the fuel distributor line 4 in the installed state.
  • FIG. 2 shows a partially illustrated fuel injector in a second known embodiment.
  • This schematic cross section through a high-pressure injection system according to the prior art illustrates that various design variants of the connecting piece 6 are conceivable.
  • a fuel distributor line 4 is provided, which extends at an offset to the valve longitudinal axes of the fuel injection valves 1.
  • the connecting piece 6 forms a connecting piece between the fuel injection valve 1 and the fuel distributor line 4, this connecting piece being fixedly connected to the fuel distributor line 4.
  • the connecting piece 6 has, as in the example shown in Figure 1, an opening which is composed of a flow opening 15 and a receiving opening 12.
  • the connecting piece 6 In contrast to the connecting piece 6 according to Figure 1 is the Flow opening 15 at an angle, for example, executed at right angles, so that the discharge opening 16 of the fuel rail 4 and the receiving opening 12 of the connecting piece 6 are not in alignment with each other.
  • the connecting piece 6 is otherwise similar cup-shaped ("Rail cup").
  • FIG. 3 shows a partially illustrated fuel injector in a third known embodiment.
  • This known solution is substantially similar in basic design to the embodiment shown in FIG.
  • the connecting piece 6 does not project in one piece from the fuel distributor line 4.
  • the connection piece 6 has its own e.g. Deep-drawn cup-shaped member which is fixedly connected by means of joining (e.g., brazing) to the fuel rail 4.
  • the wall thickness of the connecting piece 6 is therefore significantly reduced, whereby the extension length of the flow opening 15 is low.
  • the connecting piece 6 is fastened to the fuel distributor line 4 in such a way that the outflow opening 16 of the fuel distributor line 4, the flow opening 15 and the receiving opening 12 of the connecting piece 6 are aligned with one another.
  • the connector is realized within a run as a rail cup connection piece 6, in which the fuel injection valve 1 is inserted.
  • the sealing to the outside is carried out with an attached to the inlet nozzle 7 of the fuel injector 1 elastomeric sealing ring 5.
  • proportional hydraulic forces are built up against the fuel injection valve 1 and the fuel manifold 4 via the voltage applied in the connecting piece 6 fuel pressure of the cross-sectional area. In today's typical designs, this is about 10 N / bar.
  • the pressure changes slowly on the one hand by the construction and dismantling of the system pressure depending on the driving conditions, which typically happens between 50 bar at idle and 200 bar at full load.
  • there is a highly dynamic change in the pressure at each injection by the case triggered pressure waves in the fuel injector 1 (typically 10 to 40 bar peak-peak amplitude).
  • the high-frequency component of 1 to 5 kHz is transmitted via the fuel injection valves 1 and the fuel distributor line 4 as structure-borne noise to the entire engine structure (inter alia cylinder head 9) and leads there to an unwanted sound radiation, which can lead to audible ticker noises.
  • the highly dynamic pressure changes are largely kept away from the connecting piece 6 by being passed through the connecting piece 6 directly into the fuel distributor line 4, without triggering dynamic pressure fluctuations in the volume of the connecting piece 6.
  • This is done with a pressure waveguide 20, which is tubular.
  • the pressure waveguide 20 ensures that the formation of dynamic alternating forces is significantly reduced. The result is a reduced wear of the sealing rings 2, 5 and a significantly reduced noise.
  • the slowly variable pressure build-up and dismantling is maintained, since at high load conditions, the force generated by the pressure still supports the holding down of the fuel injection valves 1 by means of hold-down 10 against the combustion pressure of the combustion chamber.
  • the invention can also be implemented on a suction tube injection system.
  • FIG 4 shows a partial view of the fuel injection device in the region of the connection of the connecting piece 6 and the fuel injection valve 1 with the pressure wave guide 20 according to the invention in a schematic representation, the partial view of the embodiment of Figure 3 proceeds.
  • the pressure wave guide 20 is designed as a thin tube with a continuous longitudinal opening and with the Fuel injection valve 1 is firmly connected at its inlet end. Starting from the fuel injection valve 1, the pressure waveguide 20 protrudes in the upstream direction through the receiving opening 12, the flow opening 15 and the discharge opening 16 and slightly into the interior of the fuel distributor line 4.
  • the pressure waveguide 20 thus connects the fuel injection valve 1 to the fuel distributor line 4 caused by the opening and closing of the fuel injection valve 1 pressure waves in the fuel passing through the pressure waveguide 20 on the volume of the receiving opening 12 of the connecting piece 6 over, without there pressure fluctuations and thus to generate alternating forces.
  • a complete penetration of the discharge opening 16 through the pressure waveguide 20 is not a mandatory requirement.
  • annular leakage gap 21 In the region of the discharge opening 16 of the fuel distributor line 4, which is penetrated by the pressure waveguide 20, an annular leakage gap 21 is formed.
  • the leakage gap 21 between the pressure waveguide 20 and the wall of the discharge opening 16 allows a slow Druckauf- and -development in the connecting piece 6 according to the system pressure, so a static pressure compensation.
  • This additional, non-tight connection combines the advantages of a real line connection of the fuel injection valves 1 to the
  • Fuel distribution line 4 with the simple and inexpensive plug-in solution for connection to the fuel distribution line. 4
  • FIG. 5 schematically shows a first embodiment of a pressure waveguide 20 according to the invention.
  • the pressure waveguide 20 for example, made of a media-resistant plastic (polyamide), which is attached to a fuel filter 22 of the fuel injection valve 1 by pressing or clipping or clipping. It is also conceivable to mold the pressure waveguide 20 in one piece with the plastic base body of the fuel filter 22.
  • FIG. 6 schematically shows a second embodiment of a pressure waveguide 20 according to the invention.
  • the pressure waveguide 20 is made of a metal, for example, wherein the pressure waveguide 20 with a radially outwardly projecting flange 24, for example, to a connection sleeve 23 of the fuel injection valve 1 by gluing, welding, soldering, etc. is attached.
  • a one-piece design is conceivable in which the pressure waveguide 20 emerges directly from a thermoformed or rotated connection sleeve 23.
  • FIGS. 5 and 6 there is no fixed connection of the pressure waveguide 20 to the fuel distributor line 4. Rather, it is a clearance fit to form the leakage gap 21.
  • 20 grooves or groove or thread-like recesses may be formed on the outer circumference of the pressure waveguide.
  • FIG. 7 shows a third embodiment of a pressure waveguide 20 according to the invention, in which case the pressure waveguide 20 is fastened to the fuel distributor line 4 and is free to flow into the fuel injection valve 1, e.g. hangs in the fuel filter 22.
  • the pressure waveguide 20 is, for example, by a snap, snap, clip connection o.a. attached to the fuel rail 4.
  • the fixed connection is made such that a leakage gap 21 is maintained.
  • a second leakage gap 21 ' may also be provided, specifically between the pressure waveguide 20 and the fuel filter 22 or another component of the fuel injection valve 1 surrounding the pressure waveguide 20.
  • FIGS. 8 and 9 show cross sections through the pressure waveguide 20 in the area of the leakage gap 21 ', wherein it can be seen that the outer surface of the pressure waveguide 20 is contoured.
  • the outer surface of the pressure waveguide 20 may be e.g. Longitudinal ribs 24 ( Figure 8) or longitudinal grooves or grooves 25 ( Figure 9).
  • the pressure waveguide 20 shown in Figures 5 to 9 are for a
  • FIG. 10 shows a fourth embodiment of a pressure waveguide 20 according to the invention, this pressure waveguide 20 being suitable for a fuel injection device according to FIG.
  • the pressure waveguide 20 is either attached to the fuel filter 22 of the fuel injection valve 1 by pressing or clipping on or in one piece on
  • the pressure waveguide 20 can also be connected to the connection sleeve 23 of the fuel injection valve 1 or originate in one piece directly from a deep-drawn or rotated connection sleeve 23. In contrast to the previously described embodiments, the pressure waveguide 20 protrudes into only part of the

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

Le dispositif d'injection de carburant selon l'invention se caractérise par une construction particulièrement silencieuse. Le dispositif d'injection de carburant comprend au moins un injecteur de carburant (1) et une conduite de distribution de carburant (4) pourvue d'au moins un raccord (6), l'injecteur de carburant (1) étant introduit dans un orifice de réception (12) du raccord (6) et la conduite de distribution de carburant (4) possédant un orifice d'écoulement (16) par lequel le carburant est amené à l'injecteur de carburant (1). Un guide d'ondes de pression (20), reliant l'injecteur de carburant (1) et la conduite de distribution de carburant (4), est placé entre ces deux éléments, de sorte que des fluctuations dynamiques de pression se produisant dans l'injecteur de carburant (1) peuvent se propager dans une large mesure à travers le volume de l'orifice de réception (12) du raccord (6). Le dispositif d'injection de carburant est particulièrement approprié à l'injection directe de carburant dans une chambre de combustion d'un moteur à combustion interne par compression à allumage commandé, ainsi qu'à l'injection de carburant dans un collecteur d'admission.
EP07857303.7A 2007-10-15 2007-12-07 Dispositif d'injection de carburant Active EP2203639B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007049357A DE102007049357A1 (de) 2007-10-15 2007-10-15 Brennstoffeinspritzvorrichtung
PCT/EP2007/063559 WO2009049687A1 (fr) 2007-10-15 2007-12-07 Dispositif d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2203639A1 true EP2203639A1 (fr) 2010-07-07
EP2203639B1 EP2203639B1 (fr) 2015-07-08

Family

ID=39156553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07857303.7A Active EP2203639B1 (fr) 2007-10-15 2007-12-07 Dispositif d'injection de carburant

Country Status (7)

Country Link
US (1) US7931007B2 (fr)
EP (1) EP2203639B1 (fr)
JP (1) JP5145423B2 (fr)
KR (1) KR101432566B1 (fr)
CN (1) CN101828028B (fr)
DE (1) DE102007049357A1 (fr)
WO (1) WO2009049687A1 (fr)

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Also Published As

Publication number Publication date
JP5145423B2 (ja) 2013-02-20
DE102007049357A1 (de) 2009-04-16
US20100218742A1 (en) 2010-09-02
CN101828028A (zh) 2010-09-08
KR20100065193A (ko) 2010-06-15
CN101828028B (zh) 2015-05-27
EP2203639B1 (fr) 2015-07-08
KR101432566B1 (ko) 2014-08-22
WO2009049687A1 (fr) 2009-04-23
US7931007B2 (en) 2011-04-26
JP2011501020A (ja) 2011-01-06

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