WO2012089364A1 - Fuel supply system of an internal combustion engine with direct fuel injection - Google Patents

Fuel supply system of an internal combustion engine with direct fuel injection Download PDF

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Publication number
WO2012089364A1
WO2012089364A1 PCT/EP2011/068973 EP2011068973W WO2012089364A1 WO 2012089364 A1 WO2012089364 A1 WO 2012089364A1 EP 2011068973 W EP2011068973 W EP 2011068973W WO 2012089364 A1 WO2012089364 A1 WO 2012089364A1
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WO
WIPO (PCT)
Prior art keywords
pump
supply system
pressure
fuel supply
bar
Prior art date
Application number
PCT/EP2011/068973
Other languages
German (de)
French (fr)
Inventor
Siamend Flo
Martin Maier
Ingo Immendoerfer
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2012089364A1 publication Critical patent/WO2012089364A1/en

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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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/02—Pumps peculiar thereto
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/447—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine

Definitions

  • the invention relates to a fuel supply system of an internal combustion engine with direct fuel injection. Furthermore, the invention relates to a pump for such a fuel supply system and the use of such a pump in a fuel supply system of an internal combustion engine.
  • an electric fuel pump or a Niederbuchvor principlepumpe for pumping the fuel from the tank is installed in the tank space.
  • This pump generates pressures in the low pressure range from 0 bar to 3 to 6 bar.
  • DI direct fuel injection
  • HDP high pressure pump
  • HDP high pressure pump
  • the aim of the present invention is to provide such a fuel supply system, which is less expensive and in which the pump occupies less space for high-pressure generation on the internal combustion engine. Disclosure of the invention
  • a fuel supply system of a direct injection fuel internal combustion engine is provided with a first pump for conveying the fuel from a tank and a second pump for generating the pressure for the direct fuel injection, in which with the first pump and the second pump a substantially equal Pressure difference can be generated.
  • a similar, in particular an equal pressure difference ( ⁇ p) can be generated both with the first pump for conveying the fuel from a tank, and with the second pump for generating the pressure for the direct fuel injection.
  • ⁇ p an equal pressure difference
  • the producible pressure difference is up to 25 bar.
  • a pressure of 0 bar to preferably up to 25 bar can be generated and then with the second pump, a pressure of preferably 25 bar up to 50 bar.
  • the achievable pressure of up to 50 bar is sufficient in novel Value-Dl systems as high pressure for direct fuel injection.
  • a correspondingly divided rated pressure of up to 80 bar, in particular up to 100 bar is conceivable and useful.
  • no high-pressure pump is required in the conventional conventional sense.
  • a high pressure pump is expensive to produce and takes up much space in the space on the engine.
  • the pumps according to the solution according to the invention are adapted to produce in each case a medium pressure difference of preferably 25 bar.
  • the fact that working here in Mitteltikbe rich, costs can be saved, because a pump for generating medium pressure differences can be made much cheaper than a conventional high-pressure pump.
  • One Another advantage is the reduction of the space requirement on the internal combustion engine, since the second pump in the inventive solution is smaller than a conventional high-pressure pump.
  • the two pumps are particularly preferred of the same type. The two
  • Pumps therefore preferably have the same pumping principle. This unification of the pumps or pressure generating components they can be made much cheaper. On the one hand, no own manufacturing processes for a second type of pump have to be created and, on the other hand, it is possible to produce in larger quantities, so that there is no problem
  • the two pumps are electrically driven.
  • the second pump is electrically driven and no longer, as in a conventional manner, mechanically bonded to a camshaft drive.
  • the second pump can be flexibly arranged on the internal combustion engine, particularly advantageously also in the vicinity of the rail, i. the high-pressure line to which the injectors are connected.
  • a pressure sensor and a control unit coupled thereto are preferably provided.
  • the control unit PEM-HD
  • the control unit can optionally be arranged as a roadside control device, for example, next to the second pump or advantageously be integrated into the engine control.
  • the pressure sensor or high-pressure sensor measures the pressure between the second pump and the rail and is coupled to the control unit so that the pressure level for direct fuel injection can be regulated as required or pressure regulation in the high-pressure circuit is implemented.
  • the first pump is electrically driven and the second pump is driven mechanically, in particular with a camshaft.
  • the second pump may be formed here in particular as a piston pump. Age- natively, the second pump can also be designed as a rotary pump with electric drive.
  • a pump for such a fuel supply system is further provided, which is adapted to generate pressures of 20 bar up to 80 bar, in particular from 25 bar to 50 bar. Due to these medium-sized pressure differences that can be generated, the design of the pump can be simpler and less expensive than the design of conventional high-pressure pumps.
  • the pump according to the invention is electrically driven, whereby it can be particularly advantageous flexibly mounted, for example in the combustion chamber, since it is not dependent on a conventional cam drive.
  • the pump according to the invention is furthermore preferably adjustable with a pressure sensor and a control unit coupled thereto. Particularly advantageous in this way a self-sufficient pump system is formed, which is separately installable.
  • such a pump is also used in a fuel supply system of an internal combustion engine.
  • the FIGURE shows a hydraulic diagram of an embodiment of a fuel supply system according to the invention.
  • a fuel supply system 10 of a further not illustrated internal combustion engine in which liquid fuel, in this case gasoline, from a tank 12 by means of a first pump 14, which is designed as an electric fuel pump and generates a pressure or form pressure 16 of 25 bar , in a line 18 is promoted.
  • the line 18 is adapted to withstand rated pressures of up to 25 bar plus fluctuations.
  • the line 18 is located on the suction side of a second pump 20, which in the present case is identical in construction to the first pump 14 as an electric fuel pump. is is.
  • the pump 20 generates a pressure difference of 25 bar, so that the fuel with a pressure or high pressure 22 in the size of 50 bar in a connected to the pump 20 on the high pressure side line 24 is promoted.
  • the fuel flows into a rail 26, which forms a high pressure region, are arranged on the four high-pressure injectors 28.
  • these high-pressure injection valves 28 the fuel thus provided under high pressure can be injected at the internal combustion engine.
  • the second pump 20 is connected to a pressure sensor 30.
  • the pressure sensor 30 or high-pressure sensor measures the pressure 22 between the second pump 20 and rail 26 and communicates via a coupling 32 with a control unit 34.
  • the control unit 34 regulates via a coupling 36 the pressure generation of the pump 20 and is present as Wegbau Kunststoff réelle next to the pump 20th arranged. It may also be advantageously integrated in the engine control, which is not shown here.
  • the second pump 20 can preferably also be driven mechanically, in particular with a camshaft, and be formed as a piston pump, or it can be configured as a rotary pump with an electric drive.

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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 supply system (10) of an internal combustion engine with direct fuel injection, having a first pump (14) for delivering the fuel out of a tank (12) and having a second pump (20) for generating the pressure (22) for the direct fuel injection, pressure differences of substantially equal magnitude can be generated by the first pump (14) and by the second pump (20).

Description

Beschreibung Titel  Description title
Kraftstoffversorgungssystem einer Brennkraftmaschine mit Kraftstoffdirekteinspritzung  Fuel supply system of an internal combustion engine with direct fuel injection
Stand der Technik State of the art
Die Erfindung betrifft ein Kraftstoffversorgungssystem einer Brennkraftmaschine mit Kraftstoffdirekteinspritzung. Ferner betrifft die Erfindung eine Pumpe für ein derartiges Kraftstoffversorgungssystem und die Verwendung einer derartigen Pumpe in einem Kraftstoffversorgungssystem einer Brennkraftmaschine. The invention relates to a fuel supply system of an internal combustion engine with direct fuel injection. Furthermore, the invention relates to a pump for such a fuel supply system and the use of such a pump in a fuel supply system of an internal combustion engine.
In heutigen Kraftstoffversorgungssystemen von Brennkraftmaschinen bzw. Verbrennungsmotoren, insbesondere bei Ottomotoren, ist im Tankraum eine elektrische Kraftstoffpumpe (EKP) bzw. eine Niederdruckvorförderpumpe zur Förderung des Kraftstoffes aus dem Tank eingebaut. Diese Pumpe erzeugt Drücke im Niederdruckbereich von 0 bar auf 3 bis 6 bar. Bei Brennkraftmaschinen mit Kraftstoff-Direkteinspritzung (DI) werden in einer zweiten Stufe Einspritzdrücke im Hochdruckbereich von 50 bis 200 bar erzeugt. Dies geschieht mittels einer sogenannten Hochdruckpumpe (HDP), die in der Regel zylinderkopfnah angebracht und mechanisch vom Verbrennungsmotor bzw. Motor über eine Nockenwelle angetrieben ist. Sie ist in herkömmlicher Weise als Kolbenpumpe gestaltet. Da mit einer derartigen Pumpen Druckdifferenzen von 47 bar bis zu 195 bar erzeugbar sein müssen, ist sie zum einen relativ aufwendig herzustellen und zum anderen relativ groß. Dadurch wird entsprechend viel Bauraum am Verbrennungsmotor verbraucht. In today's fuel supply systems of internal combustion engines or internal combustion engines, especially in gasoline engines, an electric fuel pump (EKP) or a Niederdruckvorförderpumpe for pumping the fuel from the tank is installed in the tank space. This pump generates pressures in the low pressure range from 0 bar to 3 to 6 bar. In internal combustion engines with direct fuel injection (DI) injection pressures in the high pressure range of 50 to 200 bar are generated in a second stage. This is done by means of a so-called high pressure pump (HDP), which is usually mounted close to the cylinder head and mechanically driven by the engine or engine via a camshaft. It is designed in a conventional manner as a piston pump. Since with such a pump pressure differences of 47 bar up to 195 bar must be generated, it is on the one hand relatively expensive to produce and on the other hand relatively large. This consumes a corresponding amount of space on the internal combustion engine.
Ziel der vorliegenden Erfindung ist es, ein derartiges Kraftstoffversorgungssystem zu schaffen, das kostengünstiger ist und in dem die Pumpe zur Hochdruckerzeugung am Verbrennungsmotor weniger Platz einnimmt. Offenbarung der Erfindung The aim of the present invention is to provide such a fuel supply system, which is less expensive and in which the pump occupies less space for high-pressure generation on the internal combustion engine. Disclosure of the invention
Erfindungsgemäß ist ein Kraftstoffversorgungssystem einer Brennkraftmaschine mit Kraftstoffdirekteinspritzung geschaffen, mit einer ersten Pumpe zur Förde- rung des Kraftstoffes aus einem Tank und einer zweiten Pumpe zur Erzeugung des Druckes für die Kraftstoffdirekteinspritzung, bei dem mit der ersten Pumpe und mit der zweiten Pumpe eine weitgehend gleich große Druckdifferenz erzeugbar ist. Gemäß der Erfindung ist sowohl mit der ersten Pumpe zur Förderung des Kraftstoffes aus einem Tank, als auch mit der zweiten Pumpe zur Erzeugung des Druckes für die Kraftstoffdirekteinspritzung eine ähnliche, insbesondere eine gleich große Druckdifferenz (Δ p) erzeugbar. Auf diese Weise wird das für die Direkteinspritzung im Endeffekt zu erzeugende Druckniveau gleichmäßig auf zwei Pumpen bzw. Pumpenstufen verteilt bzw. in ähnlicher Größenordnung aufgeteilt. According to the invention, a fuel supply system of a direct injection fuel internal combustion engine is provided with a first pump for conveying the fuel from a tank and a second pump for generating the pressure for the direct fuel injection, in which with the first pump and the second pump a substantially equal Pressure difference can be generated. According to the invention, a similar, in particular an equal pressure difference (Δ p) can be generated both with the first pump for conveying the fuel from a tank, and with the second pump for generating the pressure for the direct fuel injection. In this way, the pressure level to be generated for the direct injection in the end is evenly distributed over two pumps or pump stages or divided in a similar order of magnitude.
Gemäß einer ersten vorteilhaften Weiterbildung des erfindungsgemäßen Kraftstoffversorgungssystems beträgt die erzeugbare Druckdifferenz bis zu 25 bar. Dies bedeutet, dass mit der ersten Pumpe ein Druck von 0 bar auf vorzugsweise bis zu 25 bar erzeugbar ist und daran anschließend mit der zweiten Pumpe ein Druck von vorzugsweise 25 bar auf bis zu 50 bar. Der damit erreichbare Druck von bis zu 50 bar ist in neuartigen Value-Dl Systemen als Hochdruck für die Kraftstoff-Direkteinspritzung ausreichend. Alternativ ist ein entsprechend aufge- teilter Bemessungsdruck von bis zu 80 bar insbesondere bis zu 100 bar denkbar und sinnvoll. Erfindungsgemäß ist also keine Hochdruckpumpe im herkömmlichen konventionellen Sinn erforderlich. Das wäre eine Pumpe, die vom Niederdruckbereich bis 6 bar einen Wert der Druckdifferenz von 44 bis zu 194 bar erzeugen muss, sodass als Enddruck 50 bar oder sogar bis zu 200 bar erreicht werden. Eine derartige Hochdruckpumpe ist aufwendig herzustellen und braucht viel Platz im Bauraum am Verbrennungsmotor. Im Gegensatz dazu sind die Pumpen gemäß der erfindungsgemäßen Lösung dazu angepasst, jeweils eine mittelgroße Druckdifferenz von vorzugsweise 25 bar zu erzeugen. Dadurch dass hier im Mitteldruckbe reich gearbeitet wird, können Kosten gespart werden, weil eine Pumpe zur Erzeugung mittelgroßer Druckdifferenzen wesentlich kostengünstiger hergestellt werden kann, als eine konventionelle Hochdruckpumpe. Ein weiterer Vorteil ist die Reduktion des Bauraumverbrauchs am Verbrennungsmotor, da die zweite Pumpe in der erfindungsgemäßen Lösung kleiner ist als eine herkömmliche Hochdruckpumpe. Die beiden Pumpen sind besonders bevorzugt von gleicher Bauart. Die beidenAccording to a first advantageous development of the fuel supply system according to the invention, the producible pressure difference is up to 25 bar. This means that with the first pump, a pressure of 0 bar to preferably up to 25 bar can be generated and then with the second pump, a pressure of preferably 25 bar up to 50 bar. The achievable pressure of up to 50 bar is sufficient in novel Value-Dl systems as high pressure for direct fuel injection. Alternatively, a correspondingly divided rated pressure of up to 80 bar, in particular up to 100 bar, is conceivable and useful. Thus, according to the invention, no high-pressure pump is required in the conventional conventional sense. This would be a pump that has to generate a value of the pressure difference of 44 up to 194 bar from the low pressure range up to 6 bar, so that the final pressure is 50 bar or even up to 200 bar. Such a high pressure pump is expensive to produce and takes up much space in the space on the engine. In contrast, the pumps according to the solution according to the invention are adapted to produce in each case a medium pressure difference of preferably 25 bar. The fact that working here in Mitteldruckbe rich, costs can be saved, because a pump for generating medium pressure differences can be made much cheaper than a conventional high-pressure pump. One Another advantage is the reduction of the space requirement on the internal combustion engine, since the second pump in the inventive solution is smaller than a conventional high-pressure pump. The two pumps are particularly preferred of the same type. The two
Pumpen weisen also vorzugsweise ein gleiches Pumpenprinzip auf. Durch diese Vereinheitlichung der Pumpen bzw. Druckerzeugungskomponenten können sie wesentlich kostengünstiger hergestellt werden. Es müssen zum einen keine eigenen Fertigungsprozesse für eine zweite Pumpenart geschaffen werden und zum anderen kann in größerer Stückzahl produziert werden, sodass sich einPumps therefore preferably have the same pumping principle. This unification of the pumps or pressure generating components they can be made much cheaper. On the one hand, no own manufacturing processes for a second type of pump have to be created and, on the other hand, it is possible to produce in larger quantities, so that there is no problem
Stückzahleffekt deutlich bemerkbar macht. Unit-rate effect clearly noticeable.
Gemäß einer vorteilhaften Weiterbildung des erfindungsgemäßen Kraftstoffversorgungssystems sind die beiden Pumpen elektrisch angetrieben. Dies bedeutet, dass auch die zweite Pumpe elektrisch angetrieben ist und nicht mehr, wie in herkömmlicher Weise, mechanisch an einen Nockenwellenantrieb gebunden ist. Auf diese Weise kann die zweite Pumpe flexibel am Verbrennungsmotor angeordnet werden, besonders vorteilhaft auch in der Nähe des Rails, d.h. der Hochdruckleitung, an der die Einspritzventile angeschlossen sind. According to an advantageous embodiment of the fuel supply system according to the invention, the two pumps are electrically driven. This means that the second pump is electrically driven and no longer, as in a conventional manner, mechanically bonded to a camshaft drive. In this way, the second pump can be flexibly arranged on the internal combustion engine, particularly advantageously also in the vicinity of the rail, i. the high-pressure line to which the injectors are connected.
Zur Regelung der zweiten Pumpe ist vorzugsweise ein Drucksensor und ein damit gekoppeltes Steuergerät vorgesehen. Somit ist eine autarke Pumpe gebildet, die vorteilhaft separat verbaubar ist. Das Steuergerät (PEM-HD) kann wahlweise als Wegbausteuergerät beispielsweise neben der zweiten Pumpe angeordnet sein oder vorteilhafterweise in die Motorsteuerung integriert sein. Der Drucksensor bzw. Hochdrucksensor (DS-HD) misst den Druck zwischen zweiter Pumpe und Rail und ist mit dem Steuergerät gekoppelt, sodass das Druckniveau für die Kraftstoffdirekteinspritzung bedarfsgerecht regelbar ist bzw. eine Druckregelung im Hochdruckkreis umgesetzt wird. To control the second pump, a pressure sensor and a control unit coupled thereto are preferably provided. Thus, a self-sufficient pump is formed, which is advantageous to install separately. The control unit (PEM-HD) can optionally be arranged as a roadside control device, for example, next to the second pump or advantageously be integrated into the engine control. The pressure sensor or high-pressure sensor (DS-HD) measures the pressure between the second pump and the rail and is coupled to the control unit so that the pressure level for direct fuel injection can be regulated as required or pressure regulation in the high-pressure circuit is implemented.
In einer weiteren Weiterbildung des erfindungsgemäßen Kraftstoffversorgungssystems ist die erste Pumpe elektrisch angetrieben und die zweite Pumpe mechanisch, insbesondere mit einer Nockenwelle angetrieben. Dies bringt den Vorteil, dass der bereits bekannte Nockenwellenantrieb übernommen werden kann. Die zweite Pumpe kann hier insbesondere als Kolbenpumpe gebildet sein. Alter- nativ kann die zweite Pumpe auch als Rotationspumpe mit Elektroantrieb gestaltet sein. In a further development of the fuel supply system according to the invention, the first pump is electrically driven and the second pump is driven mechanically, in particular with a camshaft. This has the advantage that the already known camshaft drive can be adopted. The second pump may be formed here in particular as a piston pump. Age- natively, the second pump can also be designed as a rotary pump with electric drive.
Erfindungsgemäß ist ferner eine Pumpe für ein derartiges Kraftstoffversorgungssystem geschaffen, die dazu angepasst ist, Drücke von 20 bar bis zu 80 bar, insbesondere von 25 bar bis zu 50 bar zu erzeugen. Durch diese erzeugbaren mittelgroßen Druckdifferenzen kann die Bauart der Pumpe einfacher und kostengünstiger sein als die Bauart von herkömmlichen Hochdruckpumpen. According to the invention, a pump for such a fuel supply system is further provided, which is adapted to generate pressures of 20 bar up to 80 bar, in particular from 25 bar to 50 bar. Due to these medium-sized pressure differences that can be generated, the design of the pump can be simpler and less expensive than the design of conventional high-pressure pumps.
Vorzugsweise ist die erfindungsgemäße Pumpe elektrisch angetrieben, wodurch sie besonders vorteilhaft flexibel beispielsweise im Verbrennungsraum angebracht werden kann, da sie nicht abhängig von einem konventionellen Nockenantrieb ist. Preferably, the pump according to the invention is electrically driven, whereby it can be particularly advantageous flexibly mounted, for example in the combustion chamber, since it is not dependent on a conventional cam drive.
Die erfindungsgemäße Pumpe ist weiterhin bevorzugt mit einem Drucksensor und einem damit gekoppelten Steuergerät regelbar. Besonders vorteilhaft ist auf diese Weise ein autarkes Pumpensystem gebildet, das separat verbaubar ist. The pump according to the invention is furthermore preferably adjustable with a pressure sensor and a control unit coupled thereto. Particularly advantageous in this way a self-sufficient pump system is formed, which is separately installable.
Erfindungsgemäß wird ferner eine derartige Pumpe in einem Kraftstoffversorgungssystem einer Brennkraftmaschine verwendet. According to the invention, such a pump is also used in a fuel supply system of an internal combustion engine.
Nachfolgend wird ein Ausführungsbeispiel der erfindungsgemäßen Lösung anhand der beigefügten schematischen Zeichnungen näher erläutert. An exemplary embodiment of the solution according to the invention will be explained in more detail below with reference to the attached schematic drawings.
Es zeigt die Fig. ein hydraulisches Schaubild eines Ausführungsbeispiels eines erfindungsgemäßen Kraftstoffversorgungssystems. The FIGURE shows a hydraulic diagram of an embodiment of a fuel supply system according to the invention.
In der Fig. ist ein Kraftstoffversorgungssystem 10 einer weiter nicht veranschaulichten Brennkraftmaschine dargestellt, bei dem flüssiger Kraftstoff, vorliegend Benzin, aus einem Tank 12 mittels einer ersten Pumpe 14, die als elektrische Kraftstoffpumpe gestaltet ist und einen Druck bzw. Vordruck 16 von 25 bar erzeugt, in eine Leitung 18 gefördert wird. Die Leitung 18 ist dazu angepasst, Bemessungsdrücke von bis zu 25 bar zzgl. Schwankungen auszuhalten. Shown in the FIGURE is a fuel supply system 10 of a further not illustrated internal combustion engine, in which liquid fuel, in this case gasoline, from a tank 12 by means of a first pump 14, which is designed as an electric fuel pump and generates a pressure or form pressure 16 of 25 bar , in a line 18 is promoted. The line 18 is adapted to withstand rated pressures of up to 25 bar plus fluctuations.
Die Leitung 18 befindet sich an der Saugseite einer zweiten Pumpe 20, die vorliegend baugleich mit der ersten Pumpe 14 als elektrische Kraftstoffpumpe ges- taltet ist. Die Pumpe 20 erzeugt eine Druckdifferenz von 25 bar, sodass der Kraftstoff mit einem Druck bzw. Hochdruck 22 in der Größe von 50 bar in eine an die Pumpe 20 auf der Hochdruckseite angeschlossene Leitung 24 gefördert wird. Durch die Leitung 24 fließt der Kraftstoff in ein Rail 26, das einen Hochdruckbereich bildet, an dem vier Hochdruck-Einspritzventile 28 angeordnet sind. Mittels dieser Hochdruck-Einspritzventile 28 kann der derart unter Hochdruck bereitgestellte Kraftstoff an der Brennkraftmaschine eingespritzt werden. The line 18 is located on the suction side of a second pump 20, which in the present case is identical in construction to the first pump 14 as an electric fuel pump. is is. The pump 20 generates a pressure difference of 25 bar, so that the fuel with a pressure or high pressure 22 in the size of 50 bar in a connected to the pump 20 on the high pressure side line 24 is promoted. Through the line 24, the fuel flows into a rail 26, which forms a high pressure region, are arranged on the four high-pressure injectors 28. By means of these high-pressure injection valves 28, the fuel thus provided under high pressure can be injected at the internal combustion engine.
Die zweite Pumpe 20 ist mit einem Drucksensor 30 verbunden. Der Drucksensor 30 bzw. Hochdrucksensor misst den Druck 22 zwischen zweiter Pumpe 20 und Rail 26 und kommuniziert über eine Koppelung 32 mit einem Steuergerät 34. Das Steuergerät 34 regelt über eine Koppelung 36 die Druckerzeugung der Pumpe 20 und ist vorliegend als Wegbausteuergerät neben der Pumpe 20 angeordnet. Es kann vorteilhaft auch in die Motorsteuerung integriert sein, was hier nicht näher dargestellt ist. The second pump 20 is connected to a pressure sensor 30. The pressure sensor 30 or high-pressure sensor measures the pressure 22 between the second pump 20 and rail 26 and communicates via a coupling 32 with a control unit 34. The control unit 34 regulates via a coupling 36 the pressure generation of the pump 20 and is present as Wegbausteuergerät next to the pump 20th arranged. It may also be advantageously integrated in the engine control, which is not shown here.
Alternativ zu vorliegendem Ausführungsbeispiel kann die zweite Pumpe 20 vorzugsweise auch mechanisch, insbesondere mit einer Nockenwelle angetrieben werden und als Kolbenpumpe gebildet sein oder sie kann als Rotationspumpe mit Elektroantrieb gestaltet sein. As an alternative to the present exemplary embodiment, the second pump 20 can preferably also be driven mechanically, in particular with a camshaft, and be formed as a piston pump, or it can be configured as a rotary pump with an electric drive.

Claims

Ansprüche claims
1. Kraftstoffversorgungssystem (10) einer Brennkraftmaschine mit Kraftstoffdirekteinspritzung mit einer ersten Pumpe (14) zur Förderung des Kraftstoffes aus einem Tank (12) und einer zweiten Pumpe (20) zur Erzeugung des Druckes (22) für die Kraftstoffdirekteinspritzung, A fuel delivery system (10) of a direct fuel injection type internal combustion engine having a first pump (14) for delivering the fuel from a tank (12) and a second pump (20) for generating the direct fuel injection pressure (22);
dadurch gekennzeichnet, dass mit der ersten Pumpe (14) und mit der zweiten Pumpe (20) eine weitgehend gleich große Druckdifferenz erzeugbar ist.  characterized in that with the first pump (14) and with the second pump (20) a substantially equal pressure difference can be generated.
2. Kraftstoffversorgungssystem nach Anspruch 1 , 2. Fuel supply system according to claim 1,
dadurch gekennzeichnet, dass die erzeugbare Druckdifferenz bis zu 25 bar beträgt.  characterized in that the producible pressure difference is up to 25 bar.
3. Kraftstoffversorgungssystem nach Anspruch 1 oder 2, 3. Fuel supply system according to claim 1 or 2,
dadurch gekennzeichnet, dass die beiden Pumpen (14; 20) von gleicher Bauart sind.  characterized in that the two pumps (14; 20) are of the same type.
4. Kraftstoffversorgungssystem nach Anspruch 1 bis 3, 4. Fuel supply system according to claim 1 to 3,
dadurch gekennzeichnet, dass die beiden Pumpen (14; 20) elektrisch angetrieben sind.  characterized in that the two pumps (14; 20) are electrically driven.
5. Kraftstoffversorgungssystem nach Anspruch 4, 5. Fuel supply system according to claim 4,
dadurch gekennzeichnet, dass zur Regelung der zweiten Pumpe (20) ein Drucksensor (30) und ein damit gekoppeltes Steuergerät (34) vorgesehen ist.  characterized in that for controlling the second pump (20) a pressure sensor (30) and a control unit (34) coupled thereto is provided.
6. Kraftstoffversorgungssystem nach Anspruch 1 bis 2, 6. Fuel supply system according to claim 1 to 2,
dadurch gekennzeichnet, dass die erste Pumpe (14) elektrisch und die zweite Pumpe (20) mechanisch angetrieben ist. characterized in that the first pump (14) is electrically driven and the second pump (20) is mechanically driven.
7. Pumpe (20) für ein Kraftstoffversorgungssystem nach einem der Ansprüche 1 bis 6, die dazu angepasst ist, Drücke von 20 bar bis zu 80 bar, insbesondere von 25 bar bis zu 50 bar zu erzeugen. 7. Pump (20) for a fuel supply system according to one of claims 1 to 6, which is adapted to generate pressures of 20 bar up to 80 bar, in particular from 25 bar to 50 bar.
8. Pumpe (20) nach Anspruch 7, 8. Pump (20) according to claim 7,
dadurch gekennzeichnet, dass die Pumpe (20) elektrisch angetrieben ist.  characterized in that the pump (20) is electrically driven.
9. Pumpe (20) nach Anspruch 8, 9. pump (20) according to claim 8,
dadurch gekennzeichnet, dass die Pumpe (20) mit einem Drucksensor (30) und einem damit gekoppelten Steuergerät (34) regelbar ist.  characterized in that the pump (20) is controllable with a pressure sensor (30) and a control unit (34) coupled thereto.
10. Verwendung einer Pumpe (20) nach den Ansprüchen 7 bis 9 an einem Kraftstoffversorgungssystem (10) einer Brennkraftmaschine. 10. Use of a pump (20) according to claims 7 to 9 to a fuel supply system (10) of an internal combustion engine.
PCT/EP2011/068973 2010-12-27 2011-10-28 Fuel supply system of an internal combustion engine with direct fuel injection WO2012089364A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10127516A1 (en) * 2001-06-06 2002-12-12 Bosch Gmbh Robert Operating internal combustion engine involves switching on additional electrically driven fuel pump at least for starting process to feed fuel directly to common fuel rail at raised pressure
DE10223077A1 (en) * 2002-05-24 2003-12-11 Bosch Gmbh Robert Fuel injection system for an internal combustion engine with a low-pressure reservoir has direct injection, an advance feed pump and a high-pressure pump
US20050155582A1 (en) * 2004-01-15 2005-07-21 Peter Schelhas Fuel supply system for an internal combustion engine
DE102010002801A1 (en) * 2010-03-12 2011-09-15 Robert Bosch Gmbh Fuel injection system of an internal combustion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10127516A1 (en) * 2001-06-06 2002-12-12 Bosch Gmbh Robert Operating internal combustion engine involves switching on additional electrically driven fuel pump at least for starting process to feed fuel directly to common fuel rail at raised pressure
DE10223077A1 (en) * 2002-05-24 2003-12-11 Bosch Gmbh Robert Fuel injection system for an internal combustion engine with a low-pressure reservoir has direct injection, an advance feed pump and a high-pressure pump
US20050155582A1 (en) * 2004-01-15 2005-07-21 Peter Schelhas Fuel supply system for an internal combustion engine
DE102010002801A1 (en) * 2010-03-12 2011-09-15 Robert Bosch Gmbh Fuel injection system of an internal combustion engine

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