EP1125044B1 - Fuel injection system for an internal combustion engine - Google Patents

Fuel injection system for an internal combustion engine Download PDF

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Publication number
EP1125044B1
EP1125044B1 EP00956112A EP00956112A EP1125044B1 EP 1125044 B1 EP1125044 B1 EP 1125044B1 EP 00956112 A EP00956112 A EP 00956112A EP 00956112 A EP00956112 A EP 00956112A EP 1125044 B1 EP1125044 B1 EP 1125044B1
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EP
European Patent Office
Prior art keywords
fuel
pressure
central
injection
injection system
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Expired - Lifetime
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EP00956112A
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German (de)
French (fr)
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EP1125044A1 (en
Inventor
Bernd Mahr
Martin Kropp
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/16—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor characterised by the distributor being fed from a constant pressure source, e.g. accumulator or constant pressure positive displacement pumps
    • 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
    • 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
    • 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
    • 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 is based on a fuel injection system for an internal combustion engine according to the preamble of the claim 1.
  • Such an injection system is, for example, by EP 0 711 914 A1 has become known.
  • a pressure-controlled fuel injection system the fuel pressure prevailing in the nozzle space of an injector opens a valve body (for example a nozzle needle) against the action of a closing force and thus releases the injection opening for an injection of the fuel.
  • the pressure at which fuel exits the nozzle chamber into the cylinder is called the injection pressure.
  • a stroke-controlled fuel injection system is understood in the context of the invention that the opening and closing of the injection opening of an injector take place with the aid of a displaceable valve member due to the hydraulic interaction of the fuel pressures in a nozzle chamber and in a control chamber.
  • an arrangement is referred to as central if it is intended for all cylinders together and as local if it is intended for only a single cylinder.
  • Fuel injection system is using a high pressure pump Fuel to a first high fuel pressure compressed by about 1200 bar and in a first pressure accumulator saved. Furthermore, it is under high pressure standing fuel also in a second pressure accumulator promoted in which by regulating its fuel supply a second high fuel pressure by means of a 2/2-way valve of approximately 400 bar is maintained.
  • the central valve control unit is either the lower one or higher fuel pressure in the injector nozzle area directed. There is a spring-loaded by the pressure Lifted the valve body from its valve seat so that Fuel can escape from the nozzle opening.
  • the lower fuel pressure is direct metered from the central pressure accumulator without using the Distribution device to go.
  • the pressure-controlled fuel injection system 1 is a two-stage high-pressure pump 2 is used to supply fuel to promote 3 from a storage tank 4 at two different fuel pressures.
  • the fuel is compressed to a first (lower) pressure of approximately 300 bar and fed via a delivery line 5 to a central pressure accumulator 6 (common rail), in which the fuel is stored under this pressure.
  • first pressure lines 7, corresponding to the number of individual cylinders, lead from the central pressure accumulator 6 to the individual injectors 8 (injection device) projecting into the combustion chamber of the internal combustion engine to be supplied.
  • the two-stage high-pressure pump 2 can be, for example, a cam pump with a spray adjuster similar to the distributor injection pump known from DE 35 16 867 A1.
  • the pressure is generated to a second (higher) fuel pressure of approx. 300 bar to approx. 1800 bar.
  • the fuel is fed via a delivery line 9 to a central distributor device 10 , which distributes the fuel to second pressure lines 11 , which also discharge to the injectors 8. Since the two delivery lines 5, 9 are connected to one another via a 2/2-way valve 12 , the higher fuel pressure is only built up when this connection is interrupted by energizing the 2/2-way valve 12. It is also possible that the two fuel pressures are generated by two different pumps.
  • a second pressure accumulator in which the fuel is stored under the higher pressure, can also be provided in front of the central distributor device 10.
  • a pressure surface of the valve element 16 pointing in the opening direction of the valve element 16 is exposed to the pressure prevailing there, the nozzle space 15 continuing through an annular gap between the valve element 16 and the guide bore up to the valve sealing surface 17 of the injector 8. Due to the pressure prevailing in the nozzle chamber 15, the valve member 16 sealing the injection openings 18 is opened against the action of a closing force (closing spring 19 ), the spring chamber 20 being relieved of pressure by means of a leakage line 21 .
  • a pre-injection takes place with the lower fuel pressure with de-energized 2/2-way valve 12 by energizing the local valve unit 13.
  • By energizing the 2/2-way valve 12 then takes place when the local valve unit is not energized 13 the main injection with the higher fuel pressure.
  • the local valve unit 13 becomes fuel pressure again energized.
  • the local valve unit 13 can either be part of the injector housing 1, as shown in Fig. 1, or outside the injector housing can be arranged (Fig. 2). in the latter case can be a smaller size of the injector housing to reach.
  • the higher fuel pressure can also be via a central one Pressure booster unit with refill and control mechanism be generated.
  • a central pressure accumulator can also be provided.
  • pressure controlled injectors you can also stroke-controlled injectors are used.
  • a fuel injection system 1 for an internal combustion engine in the fuel with at least two different high fuel pressures via injectors 8 in the combustion chamber of the internal combustion engine are injected can, with a central distribution device 10 for dividing of fuel to the individual injectors 8 and with a central pressure accumulator 6 for the lower one
  • Each fuel pressure is a valve unit 13 for switching between the two fuel pressures locally for each injector 8 is provided individually.
  • the central one Distribution device 10 for the higher fuel pressure parallel to the central pressure accumulator 6 for the lower one Fuel pressure arranged. To enlarge the Injection window for pre and post injection the lower fuel pressure from the central pressure accumulator 6 metered without using the distributor device 10 to go.

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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

In a fuel injection system for an internal combustion engine, in which fuel can be injected at at least two differently high fuel pressures via injectors into the combustion chamber of the engine, having a central distributor device for distributing the fuel to the individual injectors and having a central pressure reservoir for the lower fuel pressure, one valve unit for switchover between the two fuel pressures is provided locally for each injector individually. Furthermore, the central distributor device for the higher fuel pressure is disposed parallel to the central pressure reservoir for the lower fuel pressure. To enlarge the injection window for the pre-injection and the post-injection, the lower fuel pressure is metered from the central pressure reservoir, without going by way of the distributor device.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Kraftstoffeinspritzsystem für eine Brennkraftmaschine nach der Gattung des Patentanspruchs 1. The invention is based on a fuel injection system for an internal combustion engine according to the preamble of the claim 1.

Ein derartiges Einpritzsystem ist beispielsweise durch die EP 0 711 914 A1 bekanntgeworden.Such an injection system is, for example, by EP 0 711 914 A1 has become known.

Zum besseren Verständnis der nachfolgenden Beschreibung werden zunächst einige Begriffe näher erläutert: Bei einem druckgesteuerten Kraftstoffeinspritzsystem wird durch den im Düsenraum eines Injektors herrschenden Kraftstoffdruck ein Ventilkörper (z.B. eine Düsennadel) gegen die Wirkung einer Schließkraft aufgesteuert und so die Einspritzöffnung für eine Einspritzung des Kraftstoffes freigegeben. Der Druck, mit dem Kraftstoff aus dem Düsenraum in den Zylinder austritt, wird als Einspritzdruck bezeichnet. Unter einem hubgesteuerten Kraftstoffeinspritzsystem wird im Rahmen der Erfindung verstanden, daß das Öffnen und Schließen der Einspritzöffnung eines Injektors mit Hilfe eines verschieblichen Ventilglieds aufgrund des hydraulischen Zusammenwirkens der Kraftstoffdrücke in einem Düsenraum und in einem Steuerraum erfolgen. Weiterhin ist im folgenden eine Anordnung als zentral bezeichnet, wenn sie gemeinsam für alle Zylinder vorgesehen ist, und als lokal, wenn sie für nur einen einzelnen Zylinder vorgesehen ist.For a better understanding of the following description, a few terms are first explained in more detail: In a pressure-controlled fuel injection system , the fuel pressure prevailing in the nozzle space of an injector opens a valve body (for example a nozzle needle) against the action of a closing force and thus releases the injection opening for an injection of the fuel. The pressure at which fuel exits the nozzle chamber into the cylinder is called the injection pressure. A stroke-controlled fuel injection system is understood in the context of the invention that the opening and closing of the injection opening of an injector take place with the aid of a displaceable valve member due to the hydraulic interaction of the fuel pressures in a nozzle chamber and in a control chamber. Furthermore, in the following an arrangement is referred to as central if it is intended for all cylinders together and as local if it is intended for only a single cylinder.

Bei dem aus der EP 0 711 914 A1 bekannten druckgesteuerten Kraftstoffeinspritzsystem wird mit Hilfe einer Hochdruckpumpe Kraftstoff auf einen ersten hohen Kraftstoffdruck von etwa 1200 bar komprimiert und in einem ersten Druckspeicher gespeichert. Weiterhin wird der unter Hochdruck stehende Kraftstoff auch in einen zweiten Druckspeicher gefördert, in welchem durch Regelung seiner Kraftstoffzufuhr mittels eines 2/2-Wegventils ein zweiter hoher Kraftstoffdruck von ca. 400 bar aufrechterhalten wird. Über eine zentrale Ventilsteuereinheit wird entweder der tiefere oder höhere Kraftstoffdruck in den Düsenraum eines Injektors geleitet. Dort wird durch den Druck ein federbelasteter Ventilkörper von seinem Ventilsitz abgehoben, so daß Kraftstoff aus der Düsenöffnung austreten kann.In the pressure-controlled known from EP 0 711 914 A1 Fuel injection system is using a high pressure pump Fuel to a first high fuel pressure compressed by about 1200 bar and in a first pressure accumulator saved. Furthermore, it is under high pressure standing fuel also in a second pressure accumulator promoted in which by regulating its fuel supply a second high fuel pressure by means of a 2/2-way valve of approximately 400 bar is maintained. Over a The central valve control unit is either the lower one or higher fuel pressure in the injector nozzle area directed. There is a spring-loaded by the pressure Lifted the valve body from its valve seat so that Fuel can escape from the nozzle opening.

Bei diesem bekannten Kraftstoffeinspritzsystem wird der Kraftstoff für eine Einspritzung aus dem jeweiligen zentralen Druckspeicher über die zentrale Ventileinheit und die zentrale Verteilereinrichtung auf die einzelnen Injektoren aufgeteilt. Das jeweils maximal mögliche Einspritzfenster ist damit durch die Ventileinheit und die Verteilereinrichtung gemeinsam bestimmt.In this known fuel injection system Fuel for an injection from the respective central Pressure accumulator via the central valve unit and the central distribution device on the individual injectors divided up. The maximum possible injection window is thus through the valve unit and the distribution device determined together.

Vorteile der ErfindungAdvantages of the invention

Zur Vergrößerung des Einspritzfensters für den tieferen Kraftstoffdruck, d.h. für die Vor- bzw. Nacheinspritzung, wird erfindungsgemäß der tiefere Kraftstoffdruck direkt aus dem zentralen Druckspeicher zugemessen, ohne über die Verteilereinrichtung zu gehen.To enlarge the injection window for the lower one Fuel pressure, i.e. for pre and post injection, According to the invention, the lower fuel pressure is direct metered from the central pressure accumulator without using the Distribution device to go.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstands der Erfindung sind der Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the object the invention are the description, the drawing and removable from the claims.

Zeichnungdrawing

Zwei verschiedene Ausführungsbeispiele von erfindungsgemäßen druckgesteuerten Kraftstoffeinspritzsystemen, bei denen Kraftstoff mit zwei unterschiedlich hohen Kraftstoffdrücken eingespritzt wird, sind in der Zeichnung schematisch dargestellt und in der nachfolgenden Beschreibung erläutert. Es zeigen:

Fig. 1
ein Kraftstoffeinspritzsystem mit einem zentralen Druckspeicher für den tieferen Kraftstoffdruck, mit einer zentralen Verteilereinrichtung für den höheren Kraftstoffdruck sowie mit jeweils einer lokalen Ventileinheit für jeden Injektor zum Umschalten zwischen beiden Kraftstoffdrücken; und
Fig. 2
ein der Fig. 1 entsprechendes Einspritzsystem, bei dem sich die lokale Ventileinheit außerhalb des Injektors befindet.
Two different exemplary embodiments of pressure-controlled fuel injection systems according to the invention, in which fuel is injected at two different fuel pressures, are shown schematically in the drawing and explained in the following description. Show it:
Fig. 1
a fuel injection system with a central pressure accumulator for the lower fuel pressure, with a central distributor device for the higher fuel pressure and with a local valve unit for each injector for switching between the two fuel pressures; and
Fig. 2
an injection system corresponding to FIG. 1, in which the local valve unit is located outside the injector.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Bei dem in Fig. 1 dargestellten druckgesteuerten Kraftstoffeinspritzsystem 1 wird eine zweistufige Hochdruckpumpe 2 verwendet, um Kraftstoff 3 aus einem Vorratstank 4 mit zwei unterschiedlichen Kraftstoffdrücken zu fördern. In der ersten Stufe wird der Kraftstoff auf einen ersten (tieferen) Druck von ca. 300 bar komprimiert und über eine Förderleitung 5 einem zentralen Druckspeicher 6 (Common Rail) zugeführt, in dem der Kraftstoff unter diesem Druck gespeichert wird. Von dem zentralen Druckspeicher 6 führen mehrere, der Anzahl einzelner Zylinder entsprechende erste Druckleitungen 7 zu den einzelnen, in den Brennraum der zu versorgenden Brennkraftmaschine ragenden Injektoren 8 (Einspritzeinrichtung). In Fig. 1 ist lediglich einer der Injektoren 8 näher dargestellt. Die zweistufige Hochdruckpumpe 2 kann z.B. eine Nockenpumpe mit Spritzversteller ähnlich der aus DE 35 16 867 A1 bekannten Verteilereinspritzpumpe sein.In the example shown in FIG. 1, the pressure-controlled fuel injection system 1 is a two-stage high-pressure pump 2 is used to supply fuel to promote 3 from a storage tank 4 at two different fuel pressures. In the first stage, the fuel is compressed to a first (lower) pressure of approximately 300 bar and fed via a delivery line 5 to a central pressure accumulator 6 (common rail), in which the fuel is stored under this pressure. Several first pressure lines 7, corresponding to the number of individual cylinders, lead from the central pressure accumulator 6 to the individual injectors 8 (injection device) projecting into the combustion chamber of the internal combustion engine to be supplied. In Fig. 1 only one of the injectors 8 is shown in more detail. The two-stage high-pressure pump 2 can be, for example, a cam pump with a spray adjuster similar to the distributor injection pump known from DE 35 16 867 A1.

In der zweiten Stufe erfolgt die Druckerzeugung auf einen zweiten (höheren) Kraftstoffdruck von ca. 300 bar bis ca. 1800 bar. Über eine Förderleitung 9 wird der Kraftstoff einer zentralen Verteilereinrichtung 10 zugeführt, die den Kraftstoff auf zweite Druckleitungen 11 verteilt, die ebenfalls zu den Injektoren 8 abführen. Da die beiden Förderleitungen 5, 9 über ein 2/2-Wege-Ventil 12 miteinander verbunden sind, wird der höhere Kraftstoffdruck erst aufgebaut, wenn diese Verbindung durch Bestromen des 2/2-Wege-Ventils 12 unterbrochen wird. Es ist ebenso möglich, daß die beiden Kraftstoffdrücke durch zwei unterschiedliche Pumpen erzeugt werden. Um die Drehzahlabhängigkeit der Druckerzeugung zu reduzieren, kann auch ein zweiter Druckspeicher (Common Rail), in dem der Kraftstoff unter dem höheren Druck gelagert wird, vor der zentralen Verteilereinrichtung 10 vorgesehen werden.In the second stage, the pressure is generated to a second (higher) fuel pressure of approx. 300 bar to approx. 1800 bar. The fuel is fed via a delivery line 9 to a central distributor device 10 , which distributes the fuel to second pressure lines 11 , which also discharge to the injectors 8. Since the two delivery lines 5, 9 are connected to one another via a 2/2-way valve 12 , the higher fuel pressure is only built up when this connection is interrupted by energizing the 2/2-way valve 12. It is also possible that the two fuel pressures are generated by two different pumps. In order to reduce the speed dependence of the pressure generation, a second pressure accumulator (common rail), in which the fuel is stored under the higher pressure, can also be provided in front of the central distributor device 10.

Zwischen dem tieferen und dem höheren Kraftstoffdruck kann für jeden Injektor 8 einzeln über eine lokale Verteilereinrichtung 13 (3/2-Wege-Ventil) jederzeit während eines Einspritzzyklusses umgeschaltet werden. Der jeweilige Druck wird dann über eine Druckleitung 14 in einen Düsenraum 15 des Injektors 8 geleitet. Die Einspritzung erfolgt druckgesteuert mit Hilfe eines in einer Führungsbohrung axial verschiebbaren kolbenförmigen Ventilglieds 16 (Düsennadel), dessen konische Ventildichtfläche 17 mit einer Ventilsitzfläche am Injektorgehäuse zusammenwirkt und so die dort vorgesehenen Einspritzöffnungen 18 verschließt. Innerhalb des Düsenraums 15 ist eine in Öffnungsrichtung des Ventilglieds 16 weisende Druckfläche des Ventilgliedes 16 dem dort herrschenden Druck ausgesetzt, wobei sich der Düsenraum 15 über einen Ringspalt zwischen dem Ventilglied 16 und der Führungsbohrung bis an die Ventildichtfläche 17 des Injektors 8 fortsetzt. Durch den im Düsenraum 15 herrschenden Druck wird das die Einspritzöffnungen 18 abdichtende Ventilglied 16 gegen die Wirkung einer Schließkraft (Schließfeder 19) aufgesteuert, wobei der Federraum 20 mittels einer Leckageleitung 21 druckentlastet ist.It is possible to switch between the lower and the higher fuel pressure individually for each injector 8 via a local distributor device 13 (3/2-way valve) at any time during an injection cycle. The respective pressure is then passed through a pressure line 14 into a nozzle chamber 15 of the injector 8. The injection is pressure-controlled with the aid of a piston-shaped valve member 16 (nozzle needle) which is axially displaceable in a guide bore and whose conical valve sealing surface 17 interacts with a valve seat surface on the injector housing and thus closes the injection openings 18 provided there. Within the nozzle space 15, a pressure surface of the valve element 16 pointing in the opening direction of the valve element 16 is exposed to the pressure prevailing there, the nozzle space 15 continuing through an annular gap between the valve element 16 and the guide bore up to the valve sealing surface 17 of the injector 8. Due to the pressure prevailing in the nozzle chamber 15, the valve member 16 sealing the injection openings 18 is opened against the action of a closing force (closing spring 19 ), the spring chamber 20 being relieved of pressure by means of a leakage line 21 .

Eine Voreinspritzung mit dem tieferen Kraftstoffdruck erfolgt bei stromlosem 2/2-Wege-Ventil 12 durch Bestromen der lokalen Ventileinheit 13. Durch Bestromen des 2/2-Wege-Ventils 12 erfolgt dann bei unbestromter lokaler Ventileinheit 13 die Haupteinspritzung mit dem höheren Kraftstoffdruck. Für eine Nacheinspritzung mit dem tieferen Kraftstoffdruck wird die lokale Ventileinheit 13 erneut bestromt.A pre-injection takes place with the lower fuel pressure with de-energized 2/2-way valve 12 by energizing the local valve unit 13. By energizing the 2/2-way valve 12 then takes place when the local valve unit is not energized 13 the main injection with the higher fuel pressure. For a post-injection with the lower one The local valve unit 13 becomes fuel pressure again energized.

Die lokale Ventileinheit 13 kann entweder Teil des Injektorgehäuses sein, wie in Fig. 1 gezeigt ist, oder außerhalb des Injektorgehäuses angeordnet sein (Fig. 2). Im letzteren Fall läßt sich eine kleinere Baugröße des Injektorgehäuses erreichen.The local valve unit 13 can either be part of the injector housing 1, as shown in Fig. 1, or outside the injector housing can be arranged (Fig. 2). in the the latter case can be a smaller size of the injector housing to reach.

Der höhere Kraftstoffdruck kann auch über eine zentrale Druckübersetzungseinheit mit Wiederbefüllung und Steuermechanismus erzeugt werden. Für den höheren Kraftstoffdruck kann ebenfalls ein zentraler Druckspeicher vorgesehen werden. Anstelle von druckgesteuerten Injektoren können auch hubgesteuerte Injektoren eingesetzt werden. The higher fuel pressure can also be via a central one Pressure booster unit with refill and control mechanism be generated. For the higher fuel pressure a central pressure accumulator can also be provided. Instead of pressure controlled injectors you can also stroke-controlled injectors are used.

Bei einem Kraftstoffeinspritzsystem 1 für eine Brennkraftmaschine, bei dem Kraftstoff mit mindestens zwei unterschiedlich hohen Kraftstoffdrücken über Injektoren 8 in den Brennraum der Brennkraftmaschine eingespritzt werden kann, mit einer zentralen Verteilereinrichtung 10 zum Aufteilen des Kraftstoffes auf die einzelnen Injektoren 8 und mit einem zentralen Druckspeicher 6 für den tieferen Kraftstoffdruck ist jeweils eine Ventileinheit 13 zum Umschalten zwischen den beiden Kraftstoffdrücken lokal für jeden Injektor 8 einzeln vorgesehen. Außerdem ist die zentrale Verteilereinrichtung 10 für den höheren Kraftstoffdruck parallel zum zentralen Druckspeicher 6 für den tieferen Kraftstoffdruck angeordnet. Zur Vergrößerung des Einspritzfensters für die Vor- bzw. Nacheinspritzung wird der tiefere Kraftstoffdruck aus dem zentralen Druckspeicher 6 zugemessen, ohne über die Verteilereinrichtung 10 zu gehen.In a fuel injection system 1 for an internal combustion engine, in the fuel with at least two different high fuel pressures via injectors 8 in the combustion chamber of the internal combustion engine are injected can, with a central distribution device 10 for dividing of fuel to the individual injectors 8 and with a central pressure accumulator 6 for the lower one Each fuel pressure is a valve unit 13 for switching between the two fuel pressures locally for each injector 8 is provided individually. In addition, the central one Distribution device 10 for the higher fuel pressure parallel to the central pressure accumulator 6 for the lower one Fuel pressure arranged. To enlarge the Injection window for pre and post injection the lower fuel pressure from the central pressure accumulator 6 metered without using the distributor device 10 to go.

Claims (4)

  1. Fuel injection system (1) for an internal combustion engine, in which fuel having at least two different fuel pressures can be injected into the combustion space of the internal combustion engine via injectors (8), with a central distributor device (10) for allocating the fuel to the individual injectors (8), with a central pressure accumulator (6) for the lower fuel pressure, with a valve unit (13) for changing over between the two fuel pressures, characterized in that the valve unit (13) for changing over between the two fuel pressures is individually provided locally for each injector (8), and in that the central distributor device (10) for the higher fuel pressure is arranged parallel to the central pressure accumulator (6) for the lower fuel pressure.
  2. Fuel injection system according to Claim 1, characterized in that a different valve unit is provided for each fuel pressure.
  3. Fuel injection system according to one of the preceding claims, characterized in that the injectors (8) are designed for pressure control.
  4. Fuel injection system according to one of the preceding claims, characterized in that the injectors are designed for stroke control.
EP00956112A 1999-08-20 2000-08-02 Fuel injection system for an internal combustion engine Expired - Lifetime EP1125044B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19939426 1999-08-20
DE19939426A DE19939426A1 (en) 1999-08-20 1999-08-20 Fuel injection system for an internal combustion engine
PCT/DE2000/002554 WO2001014709A1 (en) 1999-08-20 2000-08-02 Fuel injection system for an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1125044A1 EP1125044A1 (en) 2001-08-22
EP1125044B1 true EP1125044B1 (en) 2004-11-03

Family

ID=7918961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00956112A Expired - Lifetime EP1125044B1 (en) 1999-08-20 2000-08-02 Fuel injection system for an internal combustion engine

Country Status (7)

Country Link
US (1) US6520153B1 (en)
EP (1) EP1125044B1 (en)
JP (1) JP2003507635A (en)
AT (1) ATE281596T1 (en)
DE (2) DE19939426A1 (en)
ES (1) ES2231240T3 (en)
WO (1) WO2001014709A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1359316B1 (en) 2002-05-03 2007-04-18 Delphi Technologies, Inc. Fuel injection system
DE102006006823B3 (en) * 2006-02-14 2007-03-15 Siemens Ag Fuel injecting method for e.g. diesel engine, involves changing phasing between crankshaft and drive shaft to obtain optimum atomization quality, so that injection falls on maximum delivery rate of pump piston
CN101936244A (en) * 2010-04-29 2011-01-05 中国第一汽车集团公司无锡油泵油嘴研究所 Internal combustion engine high pressure fuel system

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JPS49108427A (en) * 1973-02-19 1974-10-15
DE2558789A1 (en) * 1975-12-24 1977-07-14 Bosch Gmbh Robert HIGH PRESSURE FUEL INJECTION DEVICE FOR DIESEL ENGINES
DE3516867A1 (en) * 1985-05-10 1986-11-13 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
DE3618447A1 (en) * 1986-05-31 1987-12-03 Bosch Gmbh Robert Fuel injection device for internal combustion engines
JP2719924B2 (en) * 1988-05-10 1998-02-25 株式会社ゼクセル Booster unit injector
DE3907766A1 (en) * 1989-03-10 1990-09-13 Bosch Gmbh Robert STORAGE FUEL INJECTION DEVICE
AT408133B (en) * 1990-06-08 2001-09-25 Avl Verbrennungskraft Messtech INJECTION SYSTEM FOR INTERNAL COMBUSTION ENGINES
JP2882209B2 (en) * 1992-09-11 1999-04-12 三菱自動車工業株式会社 Accumulator type fuel injection device
GB9422864D0 (en) * 1994-11-12 1995-01-04 Lucas Ind Plc Fuel system
US5732679A (en) * 1995-04-27 1998-03-31 Isuzu Motors Limited Accumulator-type fuel injection system
EP0760425B1 (en) * 1995-08-30 2000-11-15 Robert Bosch Gmbh Injection device
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US6076504A (en) * 1998-03-02 2000-06-20 Cummins Engine Company, Inc. Apparatus for diagnosing failures and fault conditions in a fuel system of an internal combustion engine
AT2960U3 (en) * 1998-07-02 1999-11-25 Avl List Gmbh INTERNAL COMBUSTION ENGINE WITH DIRECT INJECTION
DE69906459T2 (en) * 1998-11-20 2003-10-23 Mitsubishi Motors Corp Fuel injection device of the Accumulatorgattung
DE19939425B4 (en) * 1999-08-20 2005-05-04 Robert Bosch Gmbh Fuel injection system for an internal combustion engine
EP1087130B1 (en) * 1999-09-22 2002-07-10 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Accumulator fuel injection system

Also Published As

Publication number Publication date
WO2001014709A1 (en) 2001-03-01
DE19939426A1 (en) 2001-03-01
US6520153B1 (en) 2003-02-18
ES2231240T3 (en) 2005-05-16
ATE281596T1 (en) 2004-11-15
EP1125044A1 (en) 2001-08-22
DE50008496D1 (en) 2004-12-09
JP2003507635A (en) 2003-02-25

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