DE102010042493A1 - Fuel injection device i.e. common-rail fuel injection system, for self-igniting internal combustion engine, has fuel injector whose drain line is connected with pump inner chamber of high pressure pump through connecting line - Google Patents

Fuel injection device i.e. common-rail fuel injection system, for self-igniting internal combustion engine, has fuel injector whose drain line is connected with pump inner chamber of high pressure pump through connecting line Download PDF

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Publication number
DE102010042493A1
DE102010042493A1 DE201010042493 DE102010042493A DE102010042493A1 DE 102010042493 A1 DE102010042493 A1 DE 102010042493A1 DE 201010042493 DE201010042493 DE 201010042493 DE 102010042493 A DE102010042493 A DE 102010042493A DE 102010042493 A1 DE102010042493 A1 DE 102010042493A1
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Germany
Prior art keywords
pump
fuel injection
fuel
high pressure
inner chamber
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DE201010042493
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German (de)
Inventor
Friedrich Boecking
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to DE201010042493 priority Critical patent/DE102010042493A1/en
Publication of DE102010042493A1 publication Critical patent/DE102010042493A1/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
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/27—Fuel-injection apparatus with filters

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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

The system has an inlet pressure pump (1) interconnecting a tank (2) with a pump inner chamber (3) of a high pressure pump (4). The pump inner chamber is connected with a pump working chamber (8) through a metering unit (10) such that fuel from the pump inner chamber is introduced into a high pressure storage. The high pressure storage is operatively connected with a fuel injector (13). A drain line (14) of the fuel injector is connected with the pump inner chamber through a connecting line (15). A filter is inserted into the connecting line.

Description

Stand der TechnikState of the art

Die Erfindung betritt ein Kraftstoffeinspritzsystem einer Brennkraftmaschine mit einer Vordruckpumpe, die einen Tank mit einem Pumpeninnenraum einer Hochdruckpumpe verschaltet, wobei der Pumpeninnenraum über eine Zumesseinheit mit einem Pumpenarbeitsraum verbunden ist und von der Hochdruckpumpe geförderter Kraftstoff von dem Pumpenarbeitsraum in einen Pumpenspeicher eingeleitet wird, wobei der Hochdruckspeicher mit zumindest einem Kraftstoffinjektor wirkverbunden ist, und der Kraftstoffinjektor einen Leckölanschluss aufweist.The invention enters a fuel injection system of an internal combustion engine with a pre-pressure pump, which connects a tank with a pump interior of a high-pressure pump, the pump interior is connected via a metering unit with a pump working space and funded by the high pressure pump fuel from the pump working space is introduced into a pump reservoir, wherein the high-pressure accumulator is operatively connected to at least one fuel injector, and the fuel injector has a leak oil connection.

Ein derartiges Kraftstoffeinspritzsystem ist aus der DE 10 2008 001 743 A1 bekannt. Dieses Kraftstoffeinspritzsystem weist Kraftstoffinjektoren auf, deren Leckölanschluss über Leitungsabschnitte mit dem Tank verbunden sind. Dabei sind die Leitungsabschnitte über Steckverbinder miteinander und mit den einzelnen Kraftstoffinjektoren verbunden. Weiterhin ist in die Leckölverbindung zu dem Tank hin eine Druckhaltevorrichtung eingesetzt. Alternativ zu einer Einleitung in den Tank kann der Leckagekraftstoff auch in die Versorgungsleitung zu der Vordruckpumpe eingeleitet werden.Such a fuel injection system is known from DE 10 2008 001 743 A1 known. This fuel injection system has fuel injectors, the leakage oil connection are connected via line sections to the tank. The line sections are connected via connectors with each other and with the individual fuel injectors. Furthermore, a pressure-maintaining device is inserted into the leakage oil connection to the tank. As an alternative to an introduction into the tank, the leakage fuel can also be introduced into the supply line to the admission pressure pump.

Der Erfindung liegt die Aufgabe zugrunde, ein Kraftstoffeinspritzsystem einer Brennkraftmaschine bereitzustellen, das bei gleicher Funktionalität gegenüber dem Stand der Technik vereinfacht ist.The invention has for its object to provide a fuel injection system of an internal combustion engine, which is simplified with the same functionality over the prior art.

Offenbarung der ErfindungDisclosure of the invention

Vorteile der ErfindungAdvantages of the invention

Diese Aufgabe wird dadurch gelöst, dass der Leckölanschluss über eine Verbindungsleitung mit dem Pumpeninnenraum verschaltet ist. Durch diese Ausgestaltung ist es möglich, auf ein sonst notwendiges Druckhalteventil, das in die Leckölrückführleitung zu dem Tank oder in eine Versorgungsleitung zu der Vordruckpumpe verzichtet werden kann. In dem Pumpeninnenraum herrscht, um die Lagerschmierung der Pumpennockenwelle in allen Betriebssituationen zuverlässig aufrechtzuerhalten, ein Innenraumdruck, der ausreicht, um den Rücklauf von den Leckölanschlüssen der Kraftstoffinjektoren auf einen ausreichend hohen Rücklaufdruck zu halten.This object is achieved in that the leak oil connection is connected via a connecting line with the pump interior. By means of this embodiment, it is possible to dispense with an otherwise necessary pressure-maintaining valve which can be dispensed with in the leakage oil return line to the tank or into a supply line to the pre-pressure pump. In the pump interior, in order to reliably maintain the bearing lubrication of the pump camshaft in all operating conditions, there is an interior pressure sufficient to maintain the return from the fuel injector's leakage oil ports at a sufficiently high return pressure.

In Weiterbildung der Erfindung ist in die Verbindungsleitung ein Filter eingesetzt. Ein solcher Filter kann vorgesehen sein, um eventuelle Schmutzpartikel sicher vor einen Eintritt in den Pumpeninnenraum zurückzuhalten. Dabei ist zu berücksichtigen, dass ein solcher Filter deutlich kostengünstiger als ein bisher verwendetes Druckhalteventil ist.In a further development of the invention, a filter is inserted into the connecting line. Such a filter can be provided to safely retain any dirt particles from entering the pump interior. It should be noted that such a filter is significantly cheaper than a previously used pressure relief valve.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in der Figur dargestelltes Ausführungsbeispiel näher beschrieben ist.Further advantageous embodiments of the invention are described in the drawings, in which an embodiment shown in the figure is described in more detail.

Kurze Beschreibung der ZeichnungShort description of the drawing

Ausführungsform der ErfindungEmbodiment of the invention

Die einzige Figur zeigt schematisch den Kraftstoffkreislauf eines Kraftstoffeinspritzsystems einer Brennkraftmaschine. Dieses Kraftstoffeinspritzsystem ist insbesondere für ein Common-Rail-Einspritzsystem einer selbstzündenden Brennkraftmaschine ausgelegt, wobei der Kraftstoff in einem Hochdruckspeicher unter einem Druck bis zu 3000 bar gespeichert wird.The single figure shows schematically the fuel circuit of a fuel injection system of an internal combustion engine. This fuel injection system is designed in particular for a common-rail injection system of a self-igniting internal combustion engine, wherein the fuel is stored in a high-pressure accumulator under a pressure up to 3000 bar.

Eine Vordruckpumpe 1 fördert Kraftstoff aus einem Tank 2 über eine nicht dargestellte Filtereinrichtung in einen Pumpeninnenraum 3 einer Hochdruckpumpe 4. Die Hochdruckpumpe 4 weist ein Pumpengehäuse auf, das den Pumpeninnenraum einschließt, wobei in dem Pumpengehäuse eine Pumpennockenwelle 5 drehbar gelagert ist. Bei einer Drehbewegung der Pumpennockenwelle 5 wird über einen Rollenstößel 6 ein Pumpenkolben 7 translatorisch auf- und abbewegt. Der Pumpenkolben 7 wirkt mit einem Pumpenarbeitsraum 8 zusammen, dem über ein Saugventil 9 und eine Zumesseinheit 10 gesteuert Kraftstoff aus dem Pumpeninnenraum 3 zugeführt wird. Von dem Pumpenkolben 7 bei einer Aufwärtsbewegung geförderter Kraftstoff wird von dem Pumpenarbeitsraum 8 über ein Rückschlagventil 11 in den nicht dargestellten Hochdruckspeicher gefördert.A pre-pressure pump 1 Promotes fuel from a tank 2 via a filter device, not shown in a pump interior 3 a high pressure pump 4 , The high pressure pump 4 has a pump housing that encloses the pump interior, wherein in the pump housing, a pump camshaft 5 is rotatably mounted. During a rotary movement of the pump camshaft 5 is about a roller tappet 6 a pump piston 7 moved up and down translationally. The pump piston 7 acts with a pump workspace 8th together, over a suction valve 9 and a metering unit 10 controlled fuel from the pump interior 3 is supplied. From the pump piston 7 fuel delivered in an upward motion is from the pump working space 8th via a check valve 11 promoted in the high-pressure accumulator, not shown.

Von der Vordruckpumpe 1 in den Pumpeninnenraum 3 geförderter Kraftstoff, der nicht zu einer Schmierung der Lagerflächen der Pumpennockenwelle 5 und nicht von der Zumesseinheit 10 in den Pumpenarbeitsraum 8 eingeleiteter Kraftstoff wird aus dem Pumpeninnenraum 3 über ein Überströmventil 12 zurück in den Tank 2 geleitet. Das Überströmventil 12 ist so eingestellt, dass in dem Pumpeninnenraum ein vorgegebener Druck eingestellt ist, der so bemessen ist, dass einerseits die Schmierung der Lagerstellen der Pumpennockenwelle 5 in allen Betriebszuständen sichergestellt ist und auch insbesondere bei einem Volllastbetrieb genügend Kraftstoff über die Zumesseinheit 10 in den Pumpenarbeitsraum 8 eingeleitet werden kann.From the pre-pressure pump 1 in the pump interior 3 subsidized fuel, which does not cause lubrication of the bearing surfaces of the pump camshaft 5 and not from the metering unit 10 into the pump workroom 8th introduced fuel is from the pump interior 3 via an overflow valve 12 back to the tank 2 directed. The overflow valve 12 is set so that in the pump interior, a predetermined pressure is set, which is so dimensioned that, on the one hand, the lubrication of the bearings of the pump camshaft 5 is ensured in all operating conditions and also in particular in a full load operation enough fuel on the metering unit 10 into the pump workroom 8th can be initiated.

Der Hochdruckspeicher ist über Hochdruckleitungen mit einer Anzahl von Kraftstoffinjektoren 13 verbunden, die kraftstoffgesteuert in zugeordnete Brennräume der Brennkraftmaschine einspritzen. Jeder Kraftstoffinjektor 13 weist einen Leckölanschluss 14 auf, die über eine gemeinsame Verbindungsleitung 15 miteinander und mit dem Pumpeninnenraum 3 der Hochdruckpumpe 4 verschaltet sind. Durch diese Schaltung wird der nötige Lecköldruck in den Kraftstoffinjektoren 13 ohne ein sonst notwendiges eigenständiges Druckhalteventil aufrechterhalten.The high pressure accumulator is over high pressure lines with a number of fuel injectors 13 connected fuel injection controlled in associated combustion chambers of the internal combustion engine. Every fuel injector 13 has a leak oil connection 14 on, over a common connection line 15 with each other and with the pump interior 3 the high pressure pump 4 are interconnected. This circuit provides the necessary leak oil pressure in the fuel injectors 13 maintained without an otherwise necessary independent pressure holding valve.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 102008001743 A1 [0002] DE 102008001743 A1 [0002]

Claims (2)

Kraftstoffeinspritzsystem einer Brennkraftmaschine mit einer Vordruckpumpe (1), die einen Tank (2) mit einem Pumpeninnenraum (3) einer Hochdruckpumpe (4) verschaltet, wobei der Pumpeninnenraum (3) über eine Zumesseinheit (10) mit einem Pumpenarbeitsraum (8) verbunden ist und von der Hochdruckpumpe (4) geförderter Kraftstoff von dem Pumpenarbeitsraum (8) in einen Hochdruckspeicher eingeleitet wird, wobei der Hochdruckspeicher mit zumindest einem Kraftstoffinjektor (13) wirkverbunden ist, und der Kraftstoffinjektor (13) einen Leckölanschluss (14) aufweist, dadurch gekennzeichnet, dass der Leckölanschluss (14) über eine Verbindungsleitung (15) mit dem Pumpeninnenraum (3) verbunden ist.Fuel injection system of an internal combustion engine with a pre-pressure pump ( 1 ), which has a tank ( 2 ) with a pump interior ( 3 ) a high pressure pump ( 4 ), wherein the pump interior ( 3 ) via a metering unit ( 10 ) with a pump work space ( 8th ) and from the high pressure pump ( 4 ) conveyed fuel from the pump work space ( 8th ) is introduced into a high-pressure accumulator, wherein the high-pressure accumulator with at least one fuel injector ( 13 ) and the fuel injector ( 13 ) a leak oil connection ( 14 ), characterized in that the leakage oil connection ( 14 ) via a connecting line ( 15 ) with the pump interior ( 3 ) connected is. Kraftstoffeinspritzsystem einer Brennkraftmaschine, dadurch gekennzeichnet, dass in die Verbindungsleitung (15) ein Filter eingesetzt ist.Fuel injection system of an internal combustion engine, characterized in that in the connecting line ( 15 ) a filter is inserted.
DE201010042493 2010-10-15 2010-10-15 Fuel injection device i.e. common-rail fuel injection system, for self-igniting internal combustion engine, has fuel injector whose drain line is connected with pump inner chamber of high pressure pump through connecting line Withdrawn DE102010042493A1 (en)

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DE201010042493 DE102010042493A1 (en) 2010-10-15 2010-10-15 Fuel injection device i.e. common-rail fuel injection system, for self-igniting internal combustion engine, has fuel injector whose drain line is connected with pump inner chamber of high pressure pump through connecting line

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DE201010042493 DE102010042493A1 (en) 2010-10-15 2010-10-15 Fuel injection device i.e. common-rail fuel injection system, for self-igniting internal combustion engine, has fuel injector whose drain line is connected with pump inner chamber of high pressure pump through connecting line

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012224408A1 (en) * 2012-12-27 2014-07-17 Robert Bosch Gmbh Fuel injection system e.g. common-rail injection system of internal combustion engine, has return-flow pipe whose downstream is connected with high-pressure pump that is integrated with spring-loaded valve which is check valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001743A1 (en) 2008-05-14 2009-11-19 Robert Bosch Gmbh Fuel injection system for internal combustion engines, has multiple fuel injectors, which have connector for connection to low-pressure collecting pipes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001743A1 (en) 2008-05-14 2009-11-19 Robert Bosch Gmbh Fuel injection system for internal combustion engines, has multiple fuel injectors, which have connector for connection to low-pressure collecting pipes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012224408A1 (en) * 2012-12-27 2014-07-17 Robert Bosch Gmbh Fuel injection system e.g. common-rail injection system of internal combustion engine, has return-flow pipe whose downstream is connected with high-pressure pump that is integrated with spring-loaded valve which is check valve

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