EP0899454B1 - Fuel injection system for a multicylinder internal combustion engine - Google Patents

Fuel injection system for a multicylinder internal combustion engine Download PDF

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Publication number
EP0899454B1
EP0899454B1 EP98114793A EP98114793A EP0899454B1 EP 0899454 B1 EP0899454 B1 EP 0899454B1 EP 98114793 A EP98114793 A EP 98114793A EP 98114793 A EP98114793 A EP 98114793A EP 0899454 B1 EP0899454 B1 EP 0899454B1
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EP
European Patent Office
Prior art keywords
injection
line
internal combustion
combustion engine
fuel 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.)
Expired - Lifetime
Application number
EP98114793A
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German (de)
French (fr)
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EP0899454A1 (en
Inventor
Markus Weisbarth
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.)
Mercedes Benz Group AG
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DaimlerChrysler AG
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Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0899454A1 publication Critical patent/EP0899454A1/en
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1832—Number of cylinders eight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F02M63/0285—Arrangement of common rails having more than one common rail
    • F02M63/0295—Arrangement of common rails having more than one common rail for V- or star- or boxer-engines

Definitions

  • the invention relates to a fuel injection system for a Multi-cylinder internal combustion engine, in particular eight-cylinder Internal combustion engine, with a high pressure pump to promote the Fuel in at least one common acting as a pressure accumulator Supply line (common rail), from the injection lines to associated solenoid-controlled injection valves to lead.
  • a pressure accumulator Supply line common rail
  • Such a fuel injection system for multi-cylinder Internal combustion engines are known from DE 43 35 171 C1, at a common supply line for each cylinder bank is provided.
  • the versions shown in Figures 3 and 4 represent eight-cylinder internal combustion engines in which the firing order at least once in a row on one of the both cylinder banks.
  • the injection processes result in particular in eight-cylinder engines Internal combustion engines undesirably high pressure vibrations in all injection lines. These pressure vibrations cannot decay due to the short firing interval of 90 °. As a result of these pressure fluctuations, large injection quantity spreads or fluctuations, particularly in the case of injection processes with pre-injection and main injection.
  • the invention has for its object in a high-pressure accumulator provided injection system simple measures to be provided by the in the branches of the high pressure accumulator Injection lines interfering with each other avoided during the injection processes.
  • DE 32 30 843 A1 discloses a fuel injection system Defined designed injection lines known with a tapering from the fuel inlet to the fuel outlet Passage cross section are provided. Through such measures should occur due to the high peak pressures Injection pump loads can be reduced.
  • a pump-line-nozzle-injection system which - in contrast to the common rail system with high-pressure accumulator, via the neighboring and assigned Injection lines carrying nozzles in connection with one another stand - separations between the individual conveyor lines of Pump via injection line to the nozzle through which none interfering mutual influences that can occur adversely affect exact injection quantities.
  • a fuel injection system 1 with high pressure storage for an eight-cylinder diesel engine 2 with a V-shape cylinder banks 3 and 4 arranged with respect to one another are exposed two high-pressure pumps 5 and 6, two as high-pressure accumulators acting supply lines 7 and 8 and from to injectors 9 to 16 leading injection lines 17 to 24 together.
  • the supply lines 7 and 8 run in the V space on the inside the respective cylinder bank 3 and 4.
  • Each of these injection lines points between the supply line and the respective injection valve a very specific one Line length and a specific inner diameter.
  • the ratio of the inside diameter to the line length of each Injection line corresponds to at least approximately 1:41, the Inner diameter of the injection line is 3.0 mm, while the injection line has a line length of 122 mm.
  • the central fuel supply line is also shown 25, the line branches leading to the high-pressure pumps 5 and 6 with 25a and 25b as well as those at the free end of the supply lines 8 and 7 arranged pressure sensors with 26 and 27 designated.

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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)

Description

Die Erfindung betrifft eine Kraftstoffeinspritzanlage für eine mehrzylindrige Brennkraftmaschine, insbesondere achtzylindrige Brennkraftmaschine, mit einer Hochdruckpumpe zur Förderung des Kraftstoffes in mindestens eine als Druckspeicher wirkende gemeinsame Versorgungsleitung (Common Rail), von der Einspritzleitungen zu zugehörigen magnetventilgesteuerten Einspritzventilen führen.The invention relates to a fuel injection system for a Multi-cylinder internal combustion engine, in particular eight-cylinder Internal combustion engine, with a high pressure pump to promote the Fuel in at least one common acting as a pressure accumulator Supply line (common rail), from the injection lines to associated solenoid-controlled injection valves to lead.

Eine derartige Kraftstoffeinspritzanlage für mehrzylindrige Brennkraftmaschinen ist aus der DE 43 35 171 C1 bekannt, bei der für jede Zylinderbank eine gemeinsame Versorgungsleitung vorgesehen ist. Die in den Figuren 3 und 4 gezeigten Ausführungen stellen achtzylindrige Brennkraftmaschinen dar, bei denen die Zündfolge zumindest einmal hintereinander auf einer der beiden Zylinderbänke erfolgt.Such a fuel injection system for multi-cylinder Internal combustion engines are known from DE 43 35 171 C1, at a common supply line for each cylinder bank is provided. The versions shown in Figures 3 and 4 represent eight-cylinder internal combustion engines in which the firing order at least once in a row on one of the both cylinder banks.

Durch die Einspritzvorgänge ergeben sich insbesondere bei achtzylindrigen Brennkraftmaschinen unerwünscht hohe Druckschwingungen in allen Einspritzleitungen. Diese Druckschwingungen können durch den kurzen Zündabstand von 90° nicht abklingen. Eine Folge dieser Druckschwingungen sind große Einspritzmengenstreuungen bzw. -schwankungen, die sich insbesondere bei Einspritzvorgängen mit Voreinspritzung und Haupteinspritzung auswirken. The injection processes result in particular in eight-cylinder engines Internal combustion engines undesirably high pressure vibrations in all injection lines. These pressure vibrations cannot decay due to the short firing interval of 90 °. As a result of these pressure fluctuations, large injection quantity spreads or fluctuations, particularly in the case of injection processes with pre-injection and main injection.

Der Erfindung liegt die Aufgabe zugrunde, in einem mit Hochdruckspeicher versehenen Einspritzsystem einfache Maßnahmen vorzusehen, durch die in den von dem Hochdruckspeicher abzweigenden Einspritzleitungen störende gegenseitige Beeinflussungen während der Einspritzvorgänge vermieden werden.The invention has for its object in a high-pressure accumulator provided injection system simple measures to be provided by the in the branches of the high pressure accumulator Injection lines interfering with each other avoided during the injection processes.

Zur Lösung der Aufgabe dienen die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale.To solve the problem serve in the characterizing part of the Claim 1 specified features.

Im Unteranspruch ist noch eine vorteilhafte Weiterbildung der Erfindung angegeben.An advantageous further development of the Invention specified.

Durch die Verwendung definiert ausgelegter Einspritzleitungen, nämlich den Innendurchmesser jeder Einspritzleitung ebenso wie die Leitungslänge jeder Einspritzleitung auf ein durch Prüfstandsversuche ermitteltes Maß festzulegen, können schädliche Schwingungsvorgänge in den Einspritzleitungen reduziert werden. Die Folge ist eine Herabsetzung der Einspritzmengenschwankungen.Through the use of defined injection lines, namely the inside diameter of each injection line as well the line length of each injection line to one by test bench tests Determining the determined measure can be harmful Vibration processes in the injection lines can be reduced. The result is a reduction in the injection quantity fluctuations.

Die insbesondere bei Brennkraftmaschinen mit kurzen Zündabständen vorkommenden Druckschwingungen lassen sich somit auf einfache Weise minimieren. Es ergibt sich neben einem ruhigeren Einspritzmengenverlauf auch ein verbessertes Abgasverhalten und Laufruheverhalten sowie ein günstigeres Geräuschverhalten.This is particularly true for internal combustion engines with short ignition intervals Occurring pressure vibrations can thus be easily Minimize way. In addition to a smoother injection quantity curve also an improved exhaust gas behavior and Smooth running behavior and a more favorable noise behavior.

Aus der DE 32 30 843 A1 ist eine Kraftstoffeinspritzanlage mit definiert ausgelegten Einspritzleitungen bekannt, die mit einem vom Kraftstoffeintritt zum Kraftstoffaustritt hin sich verjüngenden Durchlaßquerschnitt versehen sind. Durch derartige Maßnahmen sollen die infolge der hohen Spitzendrücke auftretenden Belastungen der Einspritzpumpe reduziert werden. Bei dieser Einspritzanlage handelt es sich um ein Pumpe-Leitung-Düse-Einspritzsystem, welches - im Gegensatz zum Common Rail-System mit Hochdruckspeicher, über den benachbarte und zu zugeordneten Düsen führende Einspritzleitungen miteinander in Verbindung stehen - Trennungen zwischen den einzelnen Fördersträngen von Pumpe über Einspritzleitung zur Düse aufweist, durch die keine störenden gegenseitigen Beeinflussungen auftreten können, die sich nachteilig auf exakte Einspritzmengen auswirken.DE 32 30 843 A1 discloses a fuel injection system Defined designed injection lines known with a tapering from the fuel inlet to the fuel outlet Passage cross section are provided. Through such measures should occur due to the high peak pressures Injection pump loads can be reduced. At this Injection system is a pump-line-nozzle-injection system, which - in contrast to the common rail system with high-pressure accumulator, via the neighboring and assigned Injection lines carrying nozzles in connection with one another stand - separations between the individual conveyor lines of Pump via injection line to the nozzle through which none interfering mutual influences that can occur adversely affect exact injection quantities.

Der Gegenstand der Erfindung ist in der Zeichnung schematisch dargestellt und wird im folgenden näher beschrieben.The object of the invention is schematic in the drawing shown and is described in more detail below.

Eine Kraftstoffeinspritzanlage 1 mit Hochdruckspeicherung für eine achtzylindrige Diesel-Brennkraftmaschine 2 mit V-förmig zueinander angeordneten Zylinderbänken 3 und 4 setzt sich aus zwei Hochdruckpumpen 5 und 6, aus zwei als Hochdruckspeicher wirkende Versorgungsleitungen 7 und 8 und aus zu Einspritzventilen 9 bis 16 führenden Einspritzleitungen 17 bis 24 zusammen. Die Versorgungsleitungen 7 und 8 verlaufen im V-Raum an der Innenseite der jeweiligen Zylinderbank 3 und 4. A fuel injection system 1 with high pressure storage for an eight-cylinder diesel engine 2 with a V-shape cylinder banks 3 and 4 arranged with respect to one another are exposed two high-pressure pumps 5 and 6, two as high-pressure accumulators acting supply lines 7 and 8 and from to injectors 9 to 16 leading injection lines 17 to 24 together. The supply lines 7 and 8 run in the V space on the inside the respective cylinder bank 3 and 4.

Von der gemeinsamen Versorgungsleitung 7, die der Zylinderbank 3 zugeordnet ist, zweigen die Einspritzleitungen 17,18,19 und 20 und von der gemeinsamen Versorgungsleitung 8, die der Zylinderbank 4 zugeordnet ist, zweigen die Einspritzleitungen 21,22,23 und 24 ab.From the common supply line 7, that of the cylinder bank 3 is assigned, the injection lines 17, 18, 19 and 20 and from the common supply line 8, that of the cylinder bank 4 is assigned, the injection lines branch 21, 22, 23 and 24.

Jede dieser Einspritzleitungen weist zwischen der Versorgungsleitung und dem jeweiligen Einspritzventil eine ganz bestimmmte Leitungslänge und einen ganz bestimmten Innendurchmesser auf. Das Verhältnis von Innendurchmesser zur Leitungslänge jeder Einspritzleitung entspricht zumindest annähernd 1:41, wobei der Innendurchmesser der Einspritzleitung 3,0 mm beträgt, während die Einspritzleitung eine Leitungslänge von 122 mm aufweist.Each of these injection lines points between the supply line and the respective injection valve a very specific one Line length and a specific inner diameter. The ratio of the inside diameter to the line length of each Injection line corresponds to at least approximately 1:41, the Inner diameter of the injection line is 3.0 mm, while the injection line has a line length of 122 mm.

Die Festlegung dieser Maße für eine achtzylindrige Brennkraftmaschine mit der Zündfolge 1-5-4-2-6-3-7-8 bedeutet ein Optimum im Hinblick auf Reduzierung der Druckschwingungen und demzufolge eine Minimierung der Einspritzmengenstreuungen.The definition of these dimensions for an eight-cylinder internal combustion engine with the firing order 1-5-4-2-6-3-7-8 means an optimum in terms of reducing pressure vibrations and consequently a minimization of the injection quantity spread.

In der Zeichnung sind noch die zentrale Kraftstoffzuleitung mit 25, die zu den Hochdruckpumpen 5 und 6 führenden Leitungsabzweigungen mit 25a und 25b sowie die am freien Ende der Versorgungsleitungen 8 und 7 angeordneten Drucksensoren mit 26 und 27 bezeichnet.In the drawing, the central fuel supply line is also shown 25, the line branches leading to the high-pressure pumps 5 and 6 with 25a and 25b as well as those at the free end of the supply lines 8 and 7 arranged pressure sensors with 26 and 27 designated.

Claims (2)

  1. Fuel injection unit for a multi-cylinder internal combustion engine, in particular an eight-cylinder combustion engine, with a high-pressure pump to convey the fuel to at least one common delivery line (common rail) acting as a pressure reservoir, from which injection lines lead to associated injection valves controlled by magnetic means,
    characterised in that
    the ratio between the inside diameter of each injection line to its line length is in the range between 1:36 and 1:41, the inside diameter being > 2.99 mm and the line length being < 122 mm.
  2. Fuel injection unit according to Claim 1,
    characterised in that
    the ratio between the inside diameter and the length of each line is approximately 1:41.
EP98114793A 1997-08-30 1998-08-06 Fuel injection system for a multicylinder internal combustion engine Expired - Lifetime EP0899454B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19737968A DE19737968C1 (en) 1997-08-30 1997-08-30 Fuel injector for multiple cylinder internal combustion engine
DE19737968 1997-08-30

Publications (2)

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EP0899454A1 EP0899454A1 (en) 1999-03-03
EP0899454B1 true EP0899454B1 (en) 2002-10-09

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EP98114793A Expired - Lifetime EP0899454B1 (en) 1997-08-30 1998-08-06 Fuel injection system for a multicylinder internal combustion engine

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EP (1) EP0899454B1 (en)
DE (1) DE19737968C1 (en)

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US7234449B2 (en) * 2005-07-14 2007-06-26 General Electric Company Common fuel rail fuel system for locomotive engine
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Also Published As

Publication number Publication date
US6000380A (en) 1999-12-14
DE19737968C1 (en) 1998-12-10
EP0899454A1 (en) 1999-03-03

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