EP1300584A1 - Kraftstoffversorgungsanlage für Brennkraftmaschinen - Google Patents

Kraftstoffversorgungsanlage für Brennkraftmaschinen Download PDF

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Publication number
EP1300584A1
EP1300584A1 EP02292457A EP02292457A EP1300584A1 EP 1300584 A1 EP1300584 A1 EP 1300584A1 EP 02292457 A EP02292457 A EP 02292457A EP 02292457 A EP02292457 A EP 02292457A EP 1300584 A1 EP1300584 A1 EP 1300584A1
Authority
EP
European Patent Office
Prior art keywords
fuel
restriction
injector
pressure
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.)
Withdrawn
Application number
EP02292457A
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English (en)
French (fr)
Inventor
Marc Bodin
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP1300584A1 publication Critical patent/EP1300584A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • F02M55/025—Common 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
    • F02M55/04—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
    • F02M2200/30—Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/304—Fuel-injection apparatus having mechanical parts, the movement of which is damped using hydraulic means

Definitions

  • the present invention relates to a device fuel supply for combustion engine internal and, more particularly, to such a device comprising a plurality of injectors each delivering fuel in one of the engine cylinders and means to connect each of said injectors in parallel to a common supply rail for these injectors.
  • Waves pressure aforementioned are also responsible for changes the behavior of the engine throughout the service life of it.
  • the input parameter of the first injection mapping is the flow of fuel requested, evaluated from signals representative of pedal depression throttle and fuel pressure in the common rail.
  • the present invention therefore aims to achieve a fuel supply device of the type described in preamble to this description, which does not present the drawbacks mentioned above of the devices of the prior art and which, in particular, ensures a complete damping of pressure waves born of first fuel injection, before triggering a second injection, without affecting the fuel pressure prevailing in an injector.
  • a fuel supply device for internal combustion engine comprising a plurality injectors each delivering fuel to one of the engine cylinders, and means for connecting in parallel each of said injectors to a common rail supply of fuel to these injectors, device being remarkable in that said means of connection include a layer crossing restriction thin by the fuel which flows towards said injector, said restriction being dimensioned and arranged for establish a pressure drop in said flow of fuel, suitable for attenuating pressure waves propagating in this flow.
  • a restriction of this type allows for faster amortization a pressure wave than a classical restriction, having the shape of a calibrated rejoinqe, which allows avoid disruption of a second injection by a first previous injection, as part of a fractional fuel injection, in particular.
  • the restriction is arranged at the junction of the common rail and connection means.
  • a non-return valve can be mounted in parallel on the restriction, this valve being passed from the common rail towards the injector.
  • the restriction may consist of a filter rod with a lowered filtration threshold so as to establish the pressure drop required.
  • the arrow F marks the direction of flow of the fuel in a restriction having, in cross section, the shape of a pipe of length 1 and of rectangular cross section of width L and height h.
  • ⁇ P is a linear function of D and that this pressure drop is greater than that determined by a conventional calibrated nozzle, at low flow levels.
  • the layer restriction thin used in the device according to the invention could have a longitudinal profile (following the arrow F) different from that shown in Figure 1.
  • This profile could be of variable height h so as to be first slightly convergent then slightly divergent, while respecting everywhere the condition fixed above for this height h relative to the length 1 of the restriction.
  • FIG. 3 a mode of production of a fuel supply device according to the invention.
  • This conventionally includes a common rail 1 supplied with high pressure fuel, connected to several fuel injectors, each of these being connected to ramp 1 by means of connection constituted by a supply line of this injector.
  • a filter 4 is conventionally mounted on injector 2, line 3 delivering then fuel that passes through this front filter to arrive in the injector 2 head. This ensures conventionally spraying the fuel injected into an engine cylinder, in the intake phase of a mixture air / fuel in this cylinder, prior to compression and burning the mixture.
  • line 3 is further equipped of a thin-film flow restriction 5 of the type described in conjunction with Figures 1 and 2.
  • this restriction is mounted, as illustrated in Figure 3, on the common rail 1, at the junction between it and line 3 connecting this ramp to the injector 2.
  • the advantage of this provision is revealed by the graphs of figure 4 which represent the evolution of the modulation rate TM of the pressure P and of the fuel flow D, from one end to the other of the fuel in line 3 and injector 2.
  • the modulation of the flow D is maximum at the fuel inlet in line 3 and, favorably, minimum at the head of injector 2, while the pressure modulation varies in opposite directions.
  • the present invention provides other advantages. In first, maximizing the effectiveness of the thin-film flow restriction provided by its installation on the ramp, at the speed "belly" fuel flow when opening a injector, limits the pressure drop introduced by this restriction, and therefore the reduction in pressure injected fuel.
  • restriction 5 is possible whatever the dimensions of the device and characteristics of injections of fuel used (quantity injected, number consecutive fractional injections, pressure of the fuel in the ramp, etc ).
  • the present invention also makes it possible to limit the amplitude of the pressure waves in the line and therefore the fatigue of the latter, for the benefit of the reliability of installation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP02292457A 2001-10-04 2002-10-04 Kraftstoffversorgungsanlage für Brennkraftmaschinen Withdrawn EP1300584A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0112778A FR2830573B1 (fr) 2001-10-04 2001-10-04 Dispositif d'alimentation en carburant pour moteur a combustion interne
FR0112778 2001-10-04

Publications (1)

Publication Number Publication Date
EP1300584A1 true EP1300584A1 (de) 2003-04-09

Family

ID=8867921

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02292457A Withdrawn EP1300584A1 (de) 2001-10-04 2002-10-04 Kraftstoffversorgungsanlage für Brennkraftmaschinen

Country Status (2)

Country Link
EP (1) EP1300584A1 (de)
FR (1) FR2830573B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007012092A1 (de) * 2005-07-28 2007-02-01 Avl List Gmbh Hydraulische vorrichtung mit zumindest einem druckspeicher
DE102006014035A1 (de) * 2006-03-27 2007-10-04 Siemens Ag Kraftstoffeinspritzsystem mit Kraftstoffhochdruckspeicher

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5297523A (en) * 1993-02-26 1994-03-29 Caterpillar Inc. Tuned actuating fluid inlet manifold for a hydraulically-actuated fuel injection system
EP0780569A1 (de) * 1995-12-19 1997-06-25 Nippon Soken, Inc. Speicherkraftstoffeinspritzvorrichtung
DE19826011A1 (de) * 1997-06-12 1998-12-17 Nissan Motor Motorkraftstoffzufuhrvorrichtung
EP0999362A2 (de) * 1998-11-07 2000-05-10 Lucas Industries Limited Kraftstoffsystem
EP1126161A1 (de) * 2000-02-15 2001-08-22 Siemens Aktiengesellschaft Einspritzanlage
WO2001071179A2 (en) * 2000-03-21 2001-09-27 Siemens Aktiengesellschaft Fuel injector assembly for mounting and aligning a fuel injector to a fuel rail
EP1217202A1 (de) * 2000-12-22 2002-06-26 Renault Verfahren zur Dämpfung der Druckwelle in einer hydraulischen Leitung und Verwendung dieses Verfahrens in einer Common-Rail-Einspritzvorrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3763698B2 (ja) * 1998-10-22 2006-04-05 株式会社日本自動車部品総合研究所 圧力脈動を緩和し得る燃料供給システムの設計方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5297523A (en) * 1993-02-26 1994-03-29 Caterpillar Inc. Tuned actuating fluid inlet manifold for a hydraulically-actuated fuel injection system
EP0780569A1 (de) * 1995-12-19 1997-06-25 Nippon Soken, Inc. Speicherkraftstoffeinspritzvorrichtung
DE19826011A1 (de) * 1997-06-12 1998-12-17 Nissan Motor Motorkraftstoffzufuhrvorrichtung
EP0999362A2 (de) * 1998-11-07 2000-05-10 Lucas Industries Limited Kraftstoffsystem
EP1126161A1 (de) * 2000-02-15 2001-08-22 Siemens Aktiengesellschaft Einspritzanlage
WO2001071179A2 (en) * 2000-03-21 2001-09-27 Siemens Aktiengesellschaft Fuel injector assembly for mounting and aligning a fuel injector to a fuel rail
EP1217202A1 (de) * 2000-12-22 2002-06-26 Renault Verfahren zur Dämpfung der Druckwelle in einer hydraulischen Leitung und Verwendung dieses Verfahrens in einer Common-Rail-Einspritzvorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007012092A1 (de) * 2005-07-28 2007-02-01 Avl List Gmbh Hydraulische vorrichtung mit zumindest einem druckspeicher
DE102006014035A1 (de) * 2006-03-27 2007-10-04 Siemens Ag Kraftstoffeinspritzsystem mit Kraftstoffhochdruckspeicher

Also Published As

Publication number Publication date
FR2830573A1 (fr) 2003-04-11
FR2830573B1 (fr) 2004-01-09

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