EP0968367B1 - Kraftstoffeinspritzsystem für eine brennkraftmaschine - Google Patents

Kraftstoffeinspritzsystem für eine brennkraftmaschine Download PDF

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Publication number
EP0968367B1
EP0968367B1 EP98919115A EP98919115A EP0968367B1 EP 0968367 B1 EP0968367 B1 EP 0968367B1 EP 98919115 A EP98919115 A EP 98919115A EP 98919115 A EP98919115 A EP 98919115A EP 0968367 B1 EP0968367 B1 EP 0968367B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
leading
lines
pressure lines
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
EP98919115A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0968367A1 (de
Inventor
Jörg MATTHIES
Günther Schmidt
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.)
Rolls Royce Solutions GmbH
Original Assignee
MTU Friedrichshafen GmbH
MTU Motoren und Turbinen Union Friedrichshafen 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 MTU Friedrichshafen GmbH, MTU Motoren und Turbinen Union Friedrichshafen GmbH filed Critical MTU Friedrichshafen GmbH
Publication of EP0968367A1 publication Critical patent/EP0968367A1/de
Application granted granted Critical
Publication of EP0968367B1 publication Critical patent/EP0968367B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention relates to a fuel injection system for an internal combustion engine according to the preamble of claim 1.
  • High-pressure accumulator In internal combustion engines, especially in large-volume diesel engines increasingly use fuel injection systems where fuel from one Fuel supply in a high pressure pump through a high pressure line High pressure accumulator is delivered. Of the one that acts as an oil-elastic reservoir High-pressure accumulator will supply the fuel via further high-pressure lines Fuel injectors supplied, which inject the fuel into the Inject the combustion chambers of the internal combustion engine.
  • the high pressure accumulator has so far mainly provided in the form of a so-called common rail, in which it is an elongated tubular element, of which the individual Branch high pressure lines supplying fuel injectors.
  • Fuel injection systems are known in which in addition to or instead of such common high-pressure accumulator in the form of a common rail for everyone Fuel injector separately provided high-pressure storage as individual storage are.
  • Fuel injection systems where in addition to a common High-pressure accumulators each have a separate one for each fuel injector Individual storage is available from DE 43 41 543 A1 and DE 43 41 546 A1 known.
  • the fuel injection system known from the first publication in that from the common high pressure accumulator to that for each fuel injector separately provided high-pressure accumulator leading high-pressure line a parallel connection a non-return valve in the direction of fuel delivery and a throttle provided, causing an uncontrolled backflow of fuel from the separate High-pressure accumulator in the common high-pressure accumulator and influencing the Pressure in the separate pressure storage rooms of the other fuel injectors should be avoided while the check valve is a quick refill of the should enable separate high-pressure accumulator from the common high-pressure accumulator.
  • Such measures to avoid mutual influence of the pressure in the separate high-pressure accumulators are in the from the second document known fuel injection system is not provided.
  • a fuel injection system is known from DE 43 44 190 A1, in which high-pressure accumulators separately provided for each fuel injector High pressure lines from a fuel supply using a high pressure pump high pressure fuel is supplied.
  • a check valve switched In each a fuel injector with the assigned high pressure line connecting high pressure line is a check valve switched, which is used during a printing interval by the with the Injection process or pressure drop occurring in the event of a leak is characterized, limit the amount of fuel flowing through it. Measures through which a mutual influence of the pressure in the individual high-pressure accumulators avoided are not specified, however.
  • the object of the invention is an improved fuel injection system for a Specify internal combustion engine.
  • a fuel injection system for an internal combustion engine in particular a diesel engine, which contains a number of fuel injectors for injecting fuel into the combustion chambers of the internal combustion engine and a high-pressure pump which supplies the fuel injectors via a common feed line and high-pressure lines leading to the individual fuel injectors.
  • high-pressure lines leading to the fuel injectors high-pressure stores having a specific fuel storage volume are provided.
  • the fuel storage volume of each of the high-pressure stores is between 80 and 300 times, preferably between 120 and 200 times the maximum injection quantity per injection process, and that the diameter D 2 of the high-pressure lines leading from the common feed line to the high-pressure stores is such that that the high-pressure lines exert a throttling effect on the fuel flowing through, in such a way that the spray quantity difference between the fuel injectors assumes a minimum.
  • the invention is essentially based on the knowledge that a variation in the diameter D 2 of the high-pressure lines leading from the common feed line to the high-pressure accumulators leads within a relatively small range to a significant change in the spray quantity difference of the individual fuel injectors and a pronounced one in the range of the optimal diameter Minimum.
  • the fuel injection system can be designed so that the spray quantity difference is minimal and uniform ignition pressures from cylinder to cylinder are achieved.
  • the minimum of the spray quantity difference means that the mutual influence of the individual pressure storage spaces also has a minimum.
  • a major advantage of the fuel injection system according to the invention is that the individual high-pressure accumulators supplying high-pressure lines have a low level Can have diameters and are therefore easy to bend and assemble.
  • Another advantage is that in order to minimize the mutual influence of the individual High pressure accumulator no additional elements such as check valves required are. Valves have e.g. B. due to the inertia of the moving components delayed response, so that the spread of pressure disturbances and the mutual influence of the injectors cannot be prevented.
  • the diameter D 4 of the high-pressure lines leading from the high-pressure accumulators to the fuel injectors is determined at least so large that the speed cg 4 of the fuel in these high-pressure lines during the injection process is not greater than 30 m / s, is preferably not greater than 25 m / s.
  • the lengths of the common Inlet line to the high pressure lines leading high pressure accumulators are the same. This is to ensure that the individual influences each other High pressure accumulator is the same for all fuel injectors.
  • the fuel injection system shown in Figure 1 contains a number of Fuel injectors 5 for injecting fuel into the combustion chambers Internal combustion engine, in particular a diesel engine.
  • the fuel injectors 5 are controlled by means of a control unit not specifically shown in FIG. 1 so that a optimally matched to the speed and load condition of the internal combustion engine Amount of fuel is injected into the combustion chambers of the internal combustion engine.
  • a Fuel supply also not specifically shown in FIG. 1, is by means of an or a plurality of high-pressure pumps 6, the fuel first a common feed line 1 supplied, of which 5 serves to supply the individual fuel injectors Branch high-pressure lines 2.4.
  • two feed lines 1 are provided, each of which has four fuel injectors 5 supply together, as is the case with an 8V diesel engine.
  • High-pressure accumulator 3 In the high-pressure lines 2, 4 leading to the fuel injectors 5 High-pressure accumulator 3 is provided, one for each fuel injector 5 common supply line 1 to the high-pressure accumulator 3 leading part of the High-pressure line is designated by the reference number 2, whereas that of the High-pressure accumulator 3 leading to the fuel injector 5 part of the high-pressure line Reference number 4 carries.
  • the high-pressure accumulator 3 act as an oil-elastic accumulator, in the Fuel storage volume under the high pressure supplied by the high pressure pump 6 acted upon fuel is supplied to the fuel injectors 5.
  • the fuel storage volume of each of the high-pressure accumulators 3 is between 80 and 300 times, preferably between 120 and 200 times the maximum amount of each Injection process from a fuel injector 5 into the associated combustion chamber Internal combustion engine fuel to be injected.
  • the diameter D 2 of the part 2 of the high-pressure line leading from the common supply line 1 to the high-pressure accumulator 3 is dimensioned such that the spray quantity difference between the fuel injectors 5 assumes a minimum at the nominal speed of the internal combustion engine.
  • the diagram shown in FIG. 2 shows the maximum spray quantity difference between the individual fuel injectors, that is to say the spray quantity difference from cylinder to cylinder of the internal combustion engine.
  • the diameter D 2 of the high-pressure lines 2 leading from the common feed line 1 to the high-pressure stores 3 was varied between 1.0 and 5.0 mm, in the range from 1.0 to 3.5 mm in increments of 0 , 5 mm and then in a further step of 1.5 mm.
  • the spray quantity difference in the range from 1.5 to 2.5 mm has a minimum with values between 0.25 to 0.35%, the focus of which is at a diameter D 2 of 2.0 mm, however there shows a local maximum, which, however, is not to be discussed in more detail here.
  • the significant influence of the diameter D 2 of the high-pressure lines 2 on the spray quantity difference between the individual fuel injectors can be explained by a strong damping of the returning pressure waves occurring in the high-pressure lines when the fuel injectors 5 are opened and closed, by the mutual influence of the individual high-pressure accumulators 3 and thus the amount of fuel delivered to the fuel injectors 5 can be kept very low without additional measures such as check valves or throttles.
  • the common inlet line 1 does not serve as a pressure accumulator but only for filling the high-pressure lines 2, 4 leading from the common inlet line 1 to the fuel injectors 5 separate high-pressure accumulator 3.
  • D 1 of the common inlet line 1 and the diameter D 2 of the high-pressure lines 2 leading from it to the high-pressure accumulators 3 D 1 ⁇ n R 1/2 ⁇ D 2 where n R is the number of fuel injectors 5 connected to the common feed line 1.
  • An essential object of the invention is to influence the pressure in each other the individual high-pressure accumulators 3 without the use of additional mass-laden and thus keeping sluggish reacting components as low as possible and minimizing them To obtain the difference between the injection quantities of the fuel injectors 5 with one another. For this it is necessary for the individual fuel injectors 5 to be essentially the same Conditions related to their supply of high pressure fuel be valid. In addition to an identical design of the high-pressure accumulator 3, this will achieved that the lengths of the common inlet line 1 to the High pressure storage 3 leading high pressure lines, as well as that of the High-pressure accumulators 3 leading to high-pressure lines 4 leading to fuel injectors 5 are the same.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP98919115A 1997-03-22 1998-03-19 Kraftstoffeinspritzsystem für eine brennkraftmaschine Expired - Lifetime EP0968367B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19712135A DE19712135C1 (de) 1997-03-22 1997-03-22 Kraftstoffeinspritzsystem für eine Brennkraftmaschine
DE19712135 1997-03-22
PCT/EP1998/001596 WO1998042978A1 (de) 1997-03-22 1998-03-19 Kraftstoffeinspritzsystem für eine brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP0968367A1 EP0968367A1 (de) 2000-01-05
EP0968367B1 true EP0968367B1 (de) 2001-11-21

Family

ID=7824334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98919115A Expired - Lifetime EP0968367B1 (de) 1997-03-22 1998-03-19 Kraftstoffeinspritzsystem für eine brennkraftmaschine

Country Status (6)

Country Link
US (1) US6220224B1 (enExample)
EP (1) EP0968367B1 (enExample)
JP (1) JP2001518164A (enExample)
AT (1) ATE209300T1 (enExample)
DE (2) DE19712135C1 (enExample)
WO (1) WO1998042978A1 (enExample)

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DE19842067A1 (de) * 1998-09-15 2000-03-16 Daimler Chrysler Ag Kraftstoffeinspritzanlage für eine Dieselbrennkraftmaschine
FR2786225B1 (fr) * 1998-11-24 2000-12-22 Inst Francais Du Petrole Systeme d'injection de carburant sous haute pression dans un moteur a combustion interne a injection directe
DE10061873A1 (de) * 2000-12-12 2002-06-27 Orange Gmbh Kraftstoffspeicherrohr eines Kraftstoffeinspritzsystems für eine mehrzylindrige Brennkraftmaschine
DE10114252C2 (de) * 2001-03-22 2003-01-30 Mtu Friedrichshafen Gmbh Verfahren zum Einspritzen von Kraftstoff in die Brennräume einer Brennkraftmaschine, sowie Kraftstoffeinspritzsystem für eine solche
DE10114219A1 (de) * 2001-03-23 2002-09-26 Bosch Gmbh Robert Kraftstoffinjektor mit vorgeordnetem Speichervolumen
DE10122423A1 (de) * 2001-05-09 2002-11-21 Siemens Ag Einspritzvorrichtung für ein Speichereinspritzsystem mit Funktionstrennung von Volumenspeicher und Verteilerstück
DE10143423A1 (de) * 2001-09-05 2003-05-08 Bosch Gmbh Robert Kraftstoffeinspritzsystem mit hydraulisch von der Zuleitung entkoppeltem Injektor
DE10157135B4 (de) 2001-11-21 2004-03-11 Man B & W Diesel Ag Kraftstoffversorgungsanlage in Form eines Common-Rail-Systems einer Brennkraftmaschine mit mehreren Zylindern
DE10210282A1 (de) * 2002-03-08 2003-09-25 Bosch Gmbh Robert Vorrichtung zum Einspritzen von Kraftstoff an stationären Verbrennungskraftmaschinen
FI116158B (fi) * 2002-04-08 2005-09-30 Waertsilae Finland Oy Mäntämoottorin polttoaineen syöttöjärjestelmä
DK1378659T3 (da) * 2002-07-01 2008-08-25 Mitsubishi Heavy Ind Ltd Brændstofinjektor samt dieselmotor omfattende samme
FI117349B (fi) * 2002-08-02 2006-09-15 Waertsilae Finland Oy Polttoaineen syöttöjärjestelmä
US6606977B1 (en) * 2002-09-17 2003-08-19 Stanadyne Corporation Fluid delivery line geometry optimization
JP4035417B2 (ja) * 2002-10-09 2008-01-23 臼井国際産業株式会社 対向型エンジンの燃料供給配管系における圧力脈動の減衰方法及びその装置。
US7807091B2 (en) * 2003-10-31 2010-10-05 Prysmian Cavi E Sistemi Energia S.R.L. Method and plant for the introduction of a liquid into a molten mass under pressure
DE102004035297A1 (de) * 2004-07-21 2006-02-16 Robert Bosch Gmbh Common-Rail-System mit unterschiedlichen Zulaufsleitungen zu den Injektoren
DE102004055266A1 (de) * 2004-11-17 2006-05-18 Robert Bosch Gmbh Kraftstoffeinspritzanlage mit mehreren Druckspeichern
DE102005012928A1 (de) * 2005-03-21 2006-09-28 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine mehrzylindrige Brennkraftmaschine
BRPI0613413B1 (pt) * 2005-07-18 2019-08-27 Ganser Hydromag sistema de injeção de acumulador para um motor de combustão interna
EP1780406B1 (de) * 2005-10-25 2011-01-05 CRT Common Rail Technologies AG Injektor für eine Kraftstoffeinspritzanlage sowie Kraftstoffeinspritzanlage mit einem solchen Injektor
DE102007034317A1 (de) * 2007-07-24 2009-01-29 Robert Bosch Gmbh Brennkraftmaschine mit mehreren Zylindern
FI20115126A7 (fi) 2011-02-09 2012-08-10 Waertsilae Finland Oy Polttoaineen ruiskutusjärjestelmä
DE102011005096A1 (de) * 2011-03-04 2012-09-06 Man Diesel & Turbo Se Verbrennungsmotor
CH705729A1 (de) * 2011-11-07 2013-05-15 Liebherr Machines Bulle Sa Einspritzsystem.
GB201320374D0 (en) * 2013-07-05 2014-01-01 Delphi Tech Holding Sarl Distributed fuel injection equipment
WO2017174855A1 (en) * 2016-04-06 2017-10-12 Wärtsilä Finland Oy Injection system and method for injecting supplementary liquid into cylinders of piston engine
DE202017106889U1 (de) * 2017-11-14 2019-02-15 Ems Gmbh Emergency Medical Systems Steuermodul sowie Sauerstoffversorgungssystem
DK4030049T3 (da) 2021-01-14 2024-10-28 Waertsilae Finland Oy Commonrail brændstofindsprøjtningssystem til en flercylindret intern forbrændingsstempelmotor, fremgngsmåde til opgradering af et brændstofindsprøjtningssystem i en flercylindret intern forbrændingsstempelmotor og en intern forbrøndingsstempelmotor

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DE4344190A1 (de) * 1993-12-23 1995-06-29 Orange Gmbh Kraftstoffeinspritzvorrichtung mit Hochdruck-Kraftstoffspeicher
DE19737968C1 (de) * 1997-08-30 1998-12-10 Daimler Benz Ag Kraftstoffeinspritzanlage für eine mehrzylindrige Brennkraftmaschine

Also Published As

Publication number Publication date
US6220224B1 (en) 2001-04-24
EP0968367A1 (de) 2000-01-05
DE19712135C1 (de) 1998-08-13
JP2001518164A (ja) 2001-10-09
ATE209300T1 (de) 2001-12-15
WO1998042978A1 (de) 1998-10-01
DE59802336D1 (de) 2002-01-17

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