EP1121527B1 - Fuel injection device - Google Patents

Fuel injection device Download PDF

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Publication number
EP1121527B1
EP1121527B1 EP00958261A EP00958261A EP1121527B1 EP 1121527 B1 EP1121527 B1 EP 1121527B1 EP 00958261 A EP00958261 A EP 00958261A EP 00958261 A EP00958261 A EP 00958261A EP 1121527 B1 EP1121527 B1 EP 1121527B1
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EP
European Patent Office
Prior art keywords
pressure
fuel
injector
injection
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
EP00958261A
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German (de)
French (fr)
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EP1121527A1 (en
Inventor
Bernd Mahr
Martin Kropp
Hans-Christoph Magel
Wolfgang Otterbach
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1121527A1 publication Critical patent/EP1121527A1/en
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    • 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
    • F02M63/06—Use of pressure wave generated by fuel inertia to open injection valves
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • 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
    • F02M55/002—Arrangement of leakage or drain conduits in or from 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • 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
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves

Definitions

  • the invention relates to a fuel injection device according to the preamble of Patent claim 1.
  • Fuel injection systems of the type mentioned are by the AT 002 961 U2, the WO 99/18349 A1 or US 5,213,084 has become known.
  • the fuel injection device is pressure-controlled.
  • a pressure-controlled fuel injection device is understood to be moved by the pressure prevailing in the nozzle chamber of an injector fuel pressure valve member against the action of a closing force (spring), so that the injection port for injection of the fuel from the nozzle chamber is released into the cylinder ,
  • injection pressure The pressure with which fuel exits the nozzle chamber into a cylinder of an internal combustion engine
  • system pressure is understood to mean the pressure below which fuel is available or stored in the fuel injector.
  • Leakage is understood to mean an amount of fuel that arises during operation of the fuel injection device (eg a pilot leakage ), is not used for injection and is conveyed back to the fuel tank.
  • the pressure level of this leakage may have a steady state pressure, with the fuel subsequently being expanded to the pressure level of the fuel tank.
  • the injection pressure can be adapted to load and speed become.
  • a pilot injection is often carried out here.
  • to Reduction of emissions is known as a pressure controlled injection Cheap.
  • a pressure controlled injection Cheap In the known pressure-controlled common rail systems per injector However, a consuming to be manufactured 3/2-way valve or it will be two 2/2-way valves used.
  • a pressure-controlled fuel injection device 1 promotes a variable-volume fuel pump 2 fuel 3 from a storage tank 4 via a feed line 5 in a central pressure storage chamber 6 (common rail), of which several, the number of individual cylinders corresponding pressure lines. 7 to the individual, in the combustion chamber of the engine to be supplied protruding injectors 8 (injector) dissipate.
  • a system pressure is generated and stored in the pressure storage chamber 6 at a pressure of 300 to about 1800 bar.
  • metering valves 9 which are 2/2-way valves are formed.
  • the metering valve 9 is a directly operated force-balanced Magnetic valve. But it can also be a piezoelectric actuator with a corresponding coupler space. With Help the metering valve 9, the injection pressure-controlled for each cylinder is realized.
  • the pressure line 7 connects the pressure storage chamber 6 with a nozzle chamber 10. Die Injection takes place with the aid of an axially displaceable in a guide bore piston-shaped valve member 11 with a conical valve sealing surface 12 at its one End, with it with a valve seat on the injector housing of the injector. 8 interacts. At the valve seat surface of the injector housing are injection openings intended. Inside the nozzle space 10 is an opening direction of the valve member 11 pointing pressure surface 13 exposed to the pressure prevailing there, which the Nozzle space 10 is supplied via the pressure line 7. All pressure lines 7 are over Check valves 14 to a central, d. H. intended for all pressure lines 7 Pressure relief valve 15 is connected, the pressure relief of a pressure line. 7 after the injection allows. During the injection process is the respective Pressure line 7 separated from the leakage line 16. Prevent the check valves 14 that from the required for injection pressure line 7 fuel in another temporarily Unnecessary pressure line 7 can get.
  • the pilot injection takes place with the pressure relief valve 15 closed and with it open Metering valve 9, which is energized to open.
  • metering valve 9 After opening the metering valve 9 is running a high-pressure fuel shaft in the pressure line 7 to the nozzle chamber 10.
  • the valve member 11th is lifted against a restoring force of the valve seat and the injection process can start.
  • the fuel high pressure shaft also enters a sealed Leakage line 17. This branch reduces the pressure of the in the nozzle chamber 10th inflowing fuel with respect to the pressure in the pressure storage chamber 6. Die Pre-injection therefore takes place at a lower pressure than that in the Accumulator chamber 6 prevails.
  • the leakage lines 17 and the nozzle chamber 10 is the reduced Fuel pressure wave just so big that only the pre-injection takes place and no Can be done after spraying. Reflected fuel pressure waves are caused by the Branching to the leakage line 17 steamed.
  • the pressure lines 7 and leakage lines 17 should be the same in terms of cable length be configured to the same hydraulic conditions for all injectors 8 create.
  • the injector 8 according to FIG. 1 has a seat or blind hole nozzle.
  • Fig. 2 shows instead of this geometry a Vario or a Vario-register nozzle of an injector 18 of a second embodiment.
  • the injection process can be better adapted to the requirements of the engine.
  • the actuation of the valve member 21 or a hydraulic stroke stop of the valve member 21 can take place both locally within the injector and centrally for all injectors simultaneously.

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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)

Abstract

A fuel injection system includes a pressure storage chamber and one injector assigned to each cylinder, which injector can be connected to the pressure storage chamber via a pressure line that includes a metering valve. Using a single 2/2-way valve as a metering valve per cylinder makes for a more-economical manufacture of a fuel system, especially for small engines. The fuel injection is done under pressure control.

Description

Die Erfindung betrifft eine Kraftstoffeinspritzeinrichtung gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a fuel injection device according to the preamble of Patent claim 1.

Kraftstoffeinspritzsysteme der eingangs genannten Art sind durch die AT 002 961 U2, die WO 99/18349 A1 oder die US 5,213, 084 bekannt geworden.Fuel injection systems of the type mentioned are by the AT 002 961 U2, the WO 99/18349 A1 or US 5,213,084 has become known.

Die bekannte Verwendung eines einzigen 2/2-Wege-Ventils als Zumeßventil pro Zylinder führt zu einem kostengünstigen System.The well-known use of a single 2/2-way valve as a metering valve per cylinder leads to a cost effective system.

Zum besseren Verständnis der Beschreibung und der Patentansprüche werden nachfolgend einige Begriffe erläutert: Die Kraftstoffeinspritzeinrichtung gemäß der Erfindung ist druckgesteuert ausgebildet. Im Rahmen der Erfindung wird unter einer druckgesteuerten Kraftstoffeinspritzeinrichtung verstanden, dass durch den im Düsenraum eines Injektors herrschenden Kraftstoffdruck ein Ventilglied gegen die Wirkung einer Schließkraft (Feder) bewegt wird, so dass die Einspritzöffnung für eine Einspritzung des Kraftstoffs aus dem Düsenraum in den Zylinder freigegeben wird. Der Druck, mit dem Kraftstoff aus dem Düsenraum in einen Zylinder einer Brennkraftmaschine austritt, wird als Einspritzdruck bezeichnet, während unter einem Systemdruck der Druck verstanden wird, unter dem Kraftstoff innerhalb der Kraftstoffeinspritzeinrichtung zur Verfügung steht bzw. bevorratet ist. Kraftstoffzumessung bedeutet, eine definierte Kraftstoffmenge zur Einspritzung bereitzustellen. Unter Leckage ist eine Menge an Kraftstoff zu verstehen, die beim Betrieb der Kraftstoffeinspritzeinrichtung entsteht (z.B. eine Führungsleckage), nicht zur Einspritzung verwendet und zum Kraftstofftank zurückgefördert wird. Das Druckniveau dieser Leckage kann einen Standdruck aufweisen, wobei der Kraftstoff anschließend auf das Druckniveau des Kraftstofftanks entspannt wird.For a better understanding of the description and the claims, some terms are explained below: The fuel injection device according to the invention is pressure-controlled. In the context of the invention, a pressure-controlled fuel injection device is understood to be moved by the pressure prevailing in the nozzle chamber of an injector fuel pressure valve member against the action of a closing force (spring), so that the injection port for injection of the fuel from the nozzle chamber is released into the cylinder , The pressure with which fuel exits the nozzle chamber into a cylinder of an internal combustion engine is referred to as injection pressure , while a system pressure is understood to mean the pressure below which fuel is available or stored in the fuel injector. Fuel metering means to provide a defined amount of fuel for injection. Leakage is understood to mean an amount of fuel that arises during operation of the fuel injection device (eg a pilot leakage ), is not used for injection and is conveyed back to the fuel tank. The pressure level of this leakage may have a steady state pressure, with the fuel subsequently being expanded to the pressure level of the fuel tank.

Bei Common Rail Systemen kann der Einspritzdruck an Last und Drehzahl angepaßt werden. Zur Geräuschminderung wird hier oft eine Voreinspritzung durchgeführt. Zur Reduzierung von Emissionen ist eine druckgesteuerte Einspritzung bekanntermaßen günstig. Bei den bekannten druckgesteuerten Common Rail Systemen wird pro Injektor jedoch ein aufwendig zu fertigendes 3/2-Wege-Ventil oder es werden zwei 2/2-Wege-Ventile verwendet.In common rail systems, the injection pressure can be adapted to load and speed become. To reduce noise, a pilot injection is often carried out here. to Reduction of emissions is known as a pressure controlled injection Cheap. In the known pressure-controlled common rail systems per injector However, a consuming to be manufactured 3/2-way valve or it will be two 2/2-way valves used.

Vorteile der ErfindungAdvantages of the invention

Nach Beenden der Einspritzung ist eine Entlastung des Düsenraums durch ein Druckentlastungsventil notwendig, die in der Verbindung des Druckspeicherraums mit dem Injektor angeordnet sind, um eine Nacheinspritzung zu vermeiden. Wenn der Injektor an Stelle einer Sitz- oder Sacklochdüse eine Vario- bzw. eine Vario-Register-Düse aufweist, läßt sich der Einspritzverlauf noch besser an die Erfordernisse des Motors anpassen.After completion of the injection is a discharge of the nozzle chamber by a Pressure relief valve necessary in the connection of the accumulator chamber with the Injector are arranged to prevent post-injection. When the injector is on Has a seat or blind hole nozzle a Vario or a Vario-register nozzle has leaves the injection curve can be better adapted to the requirements of the engine.

Zeichnungdrawing

Zwei Ausführungsbeispiele der erfindungsgemäßen Kraftstoffeinspritzeinrichtung sind in der schematischen Zeichnung dargestellt und werden in der nachfolgenden Beschreibung erläutert. Es zeigen:

Fig. 1
eine druckgesteuerte Kraftstoffeinspritzeinrichtung;
Fig. 2
die Kraftstoffeinspritzeinrichtung nach Fig. 1 mit einem anderen Injektoraufbau.
Two embodiments of the fuel injection device according to the invention are illustrated in the schematic drawing and are explained in the following description. Show it:
Fig. 1
a pressure controlled fuel injector;
Fig. 2
the fuel injection device of Fig. 1 with a different injector.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Bei dem in Fig. 1 dargestellten ersten Ausführungsbeispiel einer druckgesteuerten Kraftstoffeinspritzeinrichtung 1 fördert eine mengengeregelte Kraftstoffpumpe 2 Kraftstoff 3 aus einem Vorratstank 4 über eine Förderleitung 5 in einen zentralen Druckspeicherraum 6 (Common-Rail), von dem mehrere, der Anzahl einzelner Zylinder entsprechende Druckleitungen 7 zu den einzelnen, in den Brennraum der zu versorgenden Brennkraftmaschine ragenden Injektoren 8 (Einspritzvorrichtung) abführen. In der Fig. 1 ist lediglich einer der Injektoren 8 näher dargestellt. Mit Hilfe der Kraftstoffpumpe 2 wird ein Systemdruck erzeugt und im Druckspeicherraum 6 mit einem Druck von 300 bis ca. 1800 bar gelagert.In the illustrated in Fig. 1 the first embodiment of a pressure-controlled fuel injection device 1 promotes a variable-volume fuel pump 2 fuel 3 from a storage tank 4 via a feed line 5 in a central pressure storage chamber 6 (common rail), of which several, the number of individual cylinders corresponding pressure lines. 7 to the individual, in the combustion chamber of the engine to be supplied protruding injectors 8 (injector) dissipate. In Fig. 1, only one of the injectors 8 is shown in more detail. With the aid of the fuel pump 2, a system pressure is generated and stored in the pressure storage chamber 6 at a pressure of 300 to about 1800 bar.

Im Bereich des Druckspeicherraums 6 befinden sich Zumeßventile 9, die als 2/2-Wege-Ventile ausgebildet sind. Das Zumeßventil 9 ist ein direkt betätigtes kraftausgeglichenes Magnetventil. Es kann aber auch ein Piezoaktor mit entsprechendem Kopplerraum sein. Mit Hilfe des Zumeßventils 9 wird die Einspritzung für jeden Zylinder druckgesteuert realisiert. In the area of the accumulator chamber 6 are metering valves 9, which are 2/2-way valves are formed. The metering valve 9 is a directly operated force-balanced Magnetic valve. But it can also be a piezoelectric actuator with a corresponding coupler space. With Help the metering valve 9, the injection pressure-controlled for each cylinder is realized.

Die Druckleitung 7 verbindet den Druckspeicherraum 6 mit einem Düsenraum 10. Die Einspritzung erfolgt mit Hilfe eines in einer Führungsbohrung axial verschiebbaren kolbenförmigen Ventilglieds 11 mit einer konischen Ventildichtfläche 12 an seinem einen Ende, mit der es mit einer Ventilsitzfläche am Injektorgehäuse des Injektors 8 zusammenwirkt. An der Ventilsitzfläche des Injektorgehäuses sind Einspritzöffnungen vorgesehen. Innerhalb des Düsenraums 10 ist eine in Öffnungsrichtung des Ventilglieds 11 weisende Druckfläche 13 dem dort herrschenden Druck ausgesetzt, welcher dem Düsenraum 10 über die Druckleitung 7 zugeführt wird. Alle Druckleitungen 7 sind über Rückschlagventile 14 an ein zentrales, d. h. für alle Druckleitungen 7 vorgesehenes Druckentlastungsventil 15 angeschlossen, das eine Druckentlastung einer Druckleitung 7 nach der Einspritzung ermöglicht. Während des Einspritzvorgangs ist die jeweilige Druckleitung 7 von der Leckageleitung 16 abgetrennt. Die Rückschlagventile 14 verhindern, dass aus der zur Einspritzung benötigten Druckleitung 7 Kraftstoff in eine andere zeitweise nicht benötigte Druckleitung 7 gelangen kann.The pressure line 7 connects the pressure storage chamber 6 with a nozzle chamber 10. Die Injection takes place with the aid of an axially displaceable in a guide bore piston-shaped valve member 11 with a conical valve sealing surface 12 at its one End, with it with a valve seat on the injector housing of the injector. 8 interacts. At the valve seat surface of the injector housing are injection openings intended. Inside the nozzle space 10 is an opening direction of the valve member 11 pointing pressure surface 13 exposed to the pressure prevailing there, which the Nozzle space 10 is supplied via the pressure line 7. All pressure lines 7 are over Check valves 14 to a central, d. H. intended for all pressure lines 7 Pressure relief valve 15 is connected, the pressure relief of a pressure line. 7 after the injection allows. During the injection process is the respective Pressure line 7 separated from the leakage line 16. Prevent the check valves 14 that from the required for injection pressure line 7 fuel in another temporarily Unnecessary pressure line 7 can get.

Die Voreinspritzung erfolgt bei geschlossenem Druckentlastungsventil 15 und bei geöffnetem Zumeßventil 9, das zum Öffnen bestromt wird. Nach dem Öffnen des Zumeßventils 9 läuft eine Kraftstoff-Hochdruckwelle in der Druckleitung 7 zum Düsenraum 10. Das Ventilglied 11 wird gegen eine Rückstellkraft von der Ventilsitzfläche abgehoben und der Einspritzvorgang kann beginnen. Die Kraftstoff-Hochdruckwelle gelangt auch in eine verschlossene Leckageleitung 17. Diese Verzweigung reduziert den Druck des in den Düsenraum 10 einströmenden Kraftstoffs gegenüber dem Druck im Druckspeicherraum 6. Die Voreinspritzung erfolgt daher mit einem geringeren Druck, als der welcher im Druckspeicherraum 6 vorherrscht. Bei geeigneter Auslegung der Geometrien der Druckleitungen 7, der Leckageleitungen 17 und des Düsenraums 10 ist die reduzierte Kraftstoff-Druckwelle gerade so groß, dass nur die Voreinspritzung erfolgt und kein Nachspritzen erfolgen kann. Reflektierte Kraftstoff-Druckwellen werden durch die Verzweigung zur Leckageleitung 17 gedämpft.The pilot injection takes place with the pressure relief valve 15 closed and with it open Metering valve 9, which is energized to open. After opening the metering valve 9 is running a high-pressure fuel shaft in the pressure line 7 to the nozzle chamber 10. The valve member 11th is lifted against a restoring force of the valve seat and the injection process can start. The fuel high pressure shaft also enters a sealed Leakage line 17. This branch reduces the pressure of the in the nozzle chamber 10th inflowing fuel with respect to the pressure in the pressure storage chamber 6. Die Pre-injection therefore takes place at a lower pressure than that in the Accumulator chamber 6 prevails. With a suitable design of the geometries of Pressure lines 7, the leakage lines 17 and the nozzle chamber 10 is the reduced Fuel pressure wave just so big that only the pre-injection takes place and no Can be done after spraying. Reflected fuel pressure waves are caused by the Branching to the leakage line 17 steamed.

Nach der Voreinspritzung herrscht in der Druckleitung 7 bei geschlossenem Zumeßventil 9 und bei geschlossenem Druckentlastungsventil 15 ein Druckniveau, das geringer ist als der Öffnungsdruck zum Abheben des Ventilglieds 11. Wenn nun das Zumeßventil 9 erneut geöffnet wird, erfolgt die Haupteinspritzung mit gegenüber der Voreinspritzung höherem Druck, weil die Druckleitung 7 nicht druckentlastet ist und eine Erhöhung des Einspritzdrucks durch Reflexion von Druckwellen erreicht wird. Zur Beendigung der Haupteinspritzung werden das Zumeßventil 9 geschlossen und das Druckentlastungsventil 15 geöffnet. Die Druckleitung 7 wird entlastet. Zur Einspritzung in den nächsten Zylinders wird das Druckentlastungsventil 15 wieder geschlossen. After the pilot injection prevails in the pressure line 7 with closed metering valve. 9 and with the pressure relief valve 15 closed, a pressure level lower than that Opening pressure for lifting the valve member 11. If now the metering valve 9 again is opened, the main injection takes place with respect to the pilot injection higher Pressure because the pressure line 7 is not depressurized and an increase in the injection pressure is achieved by reflection of pressure waves. To finish the main injection the metering valve 9 are closed and the pressure relief valve 15 is opened. The Pressure line 7 is relieved. For injection in the next cylinder is the Pressure relief valve 15 closed again.

Die Druckleitungen 7 und Leckageleitungen 17 sollten hinsichtlich der Leitungslänge gleich ausgebildet sein, um für alle Injektoren 8 die gleichen hydraulischen Verhältnisse zu schaffen.The pressure lines 7 and leakage lines 17 should be the same in terms of cable length be configured to the same hydraulic conditions for all injectors 8 create.

Der Injektor 8 gemäß Fig. 1 weist eine Sitz- oder Sacklochdüse auf. Fig. 2 zeigt an Stelle dieser Geometrie eine Vario- bzw. eine Vario-Register-Düse eines Injektors 18 eines zweiten Ausführungsbeispiels. Der Einspritzverlauf läßt sich noch besser an die Erfordernisse des Motors anpassen. Die Ansteuerung des Ventilglieds 21 bzw. eines hydraulischen Hubanschlags des Ventilglieds 21 kann sowohl lokal innerhalb des Injektors als auch zentral für alle Injektoren gleichzeitig erfolgen. The injector 8 according to FIG. 1 has a seat or blind hole nozzle. Fig. 2 shows instead of this geometry a Vario or a Vario-register nozzle of an injector 18 of a second embodiment. The injection process can be better adapted to the requirements of the engine. The actuation of the valve member 21 or a hydraulic stroke stop of the valve member 21 can take place both locally within the injector and centrally for all injectors simultaneously.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

11
KraftstoffeinspritzeinrichtungFuel injection system
22
KraftstoffpumpeFuel pump
33
Kraftstofffuel
44
KraftstofftankFuel tank
55
Förderleitungdelivery line
66
DruckspeicherraumPressure reservoir
77
Druckleitungpressure line
88th
Injektorinjector
99
Zumeßventilmetering valve
1010
Düsenraumnozzle chamber
1111
Ventilgliedvalve member
1212
VentildichtflächeValve sealing surface
1313
Druckflächeprint area
1414
Rückschlagventilcheck valve
1515
DruckentlastungsventilPressure relief valve
1616
Leckageleitungleakage line
1717
Leckageleitungleakage line
1818
Injektorinjector
2121
Ventilgliedvalve member

Claims (2)

  1. Fuel injection device having a pressure storage chamber (6) and having an injector (8) assigned to each cylinder, which injector (8) can be connected to the pressure storage chamber (6) via a pressure line (7) which contains a metering valve (9), the metering valve (9) being configured by a 2/2-way valve, and the fuel injection being performed in a pressure-controlled manner, characterized in that the pressure lines (7) are connected to leakage lines (17) which contain non-return valves (14) and are connected to one or more, preferably one or more common, pressure relief valves (15).
  2. Fuel injection device according to Claim 1, characterized in that the injector (8) has a seat-hole-type nozzle or a blind-hole-type nozzle as injection opening.
EP00958261A 1999-08-16 2000-08-15 Fuel injection device Expired - Lifetime EP1121527B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19938169A DE19938169A1 (en) 1999-08-16 1999-08-16 Fuel injector
DE19938169 1999-08-16
PCT/DE2000/002785 WO2001012982A1 (en) 1999-08-16 2000-08-15 Fuel injection device

Publications (2)

Publication Number Publication Date
EP1121527A1 EP1121527A1 (en) 2001-08-08
EP1121527B1 true EP1121527B1 (en) 2005-04-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00958261A Expired - Lifetime EP1121527B1 (en) 1999-08-16 2000-08-15 Fuel injection device

Country Status (6)

Country Link
US (1) US6532938B1 (en)
EP (1) EP1121527B1 (en)
JP (1) JP2003507623A (en)
AT (1) ATE293754T1 (en)
DE (2) DE19938169A1 (en)
WO (1) WO2001012982A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10033428C2 (en) * 2000-07-10 2002-07-11 Bosch Gmbh Robert Pressure controlled injector for injecting fuel
DE10054526A1 (en) * 2000-11-03 2002-05-16 Bosch Gmbh Robert injection
DE10114252C2 (en) * 2001-03-22 2003-01-30 Mtu Friedrichshafen Gmbh Method for injecting fuel into the combustion chambers of an internal combustion engine, and fuel injection system for such
SE525208C2 (en) * 2003-05-27 2004-12-28 Scania Cv Ab Injectors
DE10355411B3 (en) * 2003-11-27 2005-07-14 Siemens Ag Injection system and injection method for an internal combustion engine
DE102004010760A1 (en) * 2004-03-05 2005-09-22 Robert Bosch Gmbh Fuel injection device for internal combustion engines with Nadelhubdämpfung
US7428893B2 (en) * 2004-11-12 2008-09-30 Caterpillar Inc Electronic flow control valve
DE102006020634B4 (en) * 2006-05-04 2008-12-04 Man Diesel Se Injection injector for internal combustion engines
US8443780B2 (en) 2010-06-01 2013-05-21 Caterpillar Inc. Low leakage cam assisted common rail fuel system, fuel injector, and operating method therefor
US20110297125A1 (en) * 2010-06-03 2011-12-08 Caterpillar Inc. Reverse Flow Check Valve For Common Rail Fuel System
US9470195B2 (en) 2012-12-18 2016-10-18 Fca Us Llc Fuel supply system with accumulator
US20140165965A1 (en) * 2012-12-18 2014-06-19 Michael R. Teets Fuel supply system with accumulator
WO2017174118A1 (en) * 2016-04-05 2017-10-12 Befinal Gmbh Fuel exchange and fuel delivery system for fuel installations

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2907279A1 (en) * 1979-02-24 1980-08-28 Inst Motorenbau Prof Huber E V Fuel injection system for IC engine - has electromagnetic control elements feeding fuel from common chamber to individual nozzle
US5109822A (en) * 1989-01-11 1992-05-05 Martin Tiby M High pressure electronic common-rail fuel injection system for diesel engines
DE4019586A1 (en) * 1990-06-20 1992-01-02 Bosch Gmbh Robert FUEL INJECTION SYSTEM FOR INTERNAL COMBUSTION ENGINES
DE4313852B4 (en) * 1993-04-28 2004-11-25 Robert Bosch Gmbh Fuel injection device for internal combustion engines
DE4330720C2 (en) * 1993-09-10 1996-06-13 Daimler Benz Ag Fuel injection system for multi-cylinder internal combustion engines
US5647536A (en) * 1995-01-23 1997-07-15 Cummins Engine Company, Inc. Injection rate shaping nozzle assembly for a fuel injector
US5732679A (en) * 1995-04-27 1998-03-31 Isuzu Motors Limited Accumulator-type fuel injection system
DE19618698A1 (en) * 1996-05-09 1997-11-13 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE19623211A1 (en) * 1996-06-11 1997-12-18 Bosch Gmbh Robert Fuel injection valve for internal combustion engines
DE19706467C1 (en) * 1997-02-19 1998-03-26 Daimler Benz Ag Fuel injector for multi-cylinder IC engines
ES2171038T3 (en) * 1997-07-16 2002-08-16 Wartsila France Sas FUEL INJECTION DEVICE FOR DIESEL ENGINES.
DE29717649U1 (en) * 1997-10-02 1997-11-20 FEV Motorentechnik GmbH & Co. KG, 52078 Aachen Directly controlled injection valve, in particular fuel injection valve
DE19746492A1 (en) * 1997-10-22 1999-04-29 Bosch Gmbh Robert Dual fluid injection system for IC engine
DE19812170A1 (en) * 1998-03-19 1999-09-23 Daimler Chrysler Ag Fuel injection system for multicylinder internal combustion engine
AT2961U3 (en) * 1998-07-02 1999-11-25 Avl List Gmbh STORAGE INJECTION DEVICE
JP4445072B2 (en) * 1998-10-20 2010-04-07 ヴェルトジィレ シュヴァイツ アクチェンゲゼルシャフト Liquid injection device for diesel engine cylinder and diesel engine

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US6532938B1 (en) 2003-03-18
JP2003507623A (en) 2003-02-25
ATE293754T1 (en) 2005-05-15
EP1121527A1 (en) 2001-08-08
WO2001012982A1 (en) 2001-02-22
DE50010099D1 (en) 2005-05-25
DE19938169A1 (en) 2001-03-01

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