WO2013131661A1 - Fuel injection system - Google Patents

Fuel injection system Download PDF

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Publication number
WO2013131661A1
WO2013131661A1 PCT/EP2013/050137 EP2013050137W WO2013131661A1 WO 2013131661 A1 WO2013131661 A1 WO 2013131661A1 EP 2013050137 W EP2013050137 W EP 2013050137W WO 2013131661 A1 WO2013131661 A1 WO 2013131661A1
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WO
WIPO (PCT)
Prior art keywords
pump
fuel injection
injection system
fuel
pressure
Prior art date
Application number
PCT/EP2013/050137
Other languages
German (de)
French (fr)
Inventor
Friedrich Boecking
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 WO2013131661A1 publication Critical patent/WO2013131661A1/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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0265—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
    • 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
    • F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically

Definitions

  • the present invention relates to a fuel injection system for an internal combustion engine, comprising a low-pressure pump having low-pressure system, which is connected to a high-pressure pump having a high-pressure system, wherein the high pressure pump has a covered by a pump cylinder head and a cylinder bore having pump cylinder, wherein in the cylinder bore a pump piston is translationally movable, wherein further in the cylinder bore formed by the pump piston and the penzpenzylinderkopf pump working space is formed, which is connected via an electrically operated inlet valve to the low pressure system, and wherein the pump working space is connected via a high pressure line with inserted check valve with a high pressure accumulator which is interconnected with at least one fuel injector.
  • Such a fuel injection system for an internal combustion engine is known from DE 10 2006 013 703 A1.
  • This fuel injection system includes a high pressure pump having an electromagnetically actuated intake valve.
  • the intake valve is installed in an intake valve housing that is screwed into the pump cylinder head, for example.
  • the inlet valve or a valve pin of the inlet valve is connected to a spring plate, on which a valve spring is supported and moves the inlet valve into the closed position.
  • the spring plate comprises a sleeve which cooperates via a connecting rod with an electromagnet which limits the opening stroke of the inlet valve by the free movement path of the spring plate and thus the opening stroke of the inlet valve is limited.
  • the invention is based on the object to provide a fuel injection system that is simple in construction with high reliability.
  • the at least one fuel injector has a fuel return, which opens into the low pressure system between the low pressure pump and the high pressure pump.
  • a fuel return which opens into the low pressure system between the low pressure pump and the high pressure pump.
  • the fuel return is now connected to the low-pressure system and in particular opens into a low-pressure line.
  • a fuel filter may be installed in the low pressure line, wherein the return line preferably opens in the flow direction in front of the fuel filter in the low pressure line, but in principle can also open downstream of the fuel filter in the low pressure line.
  • This embodiment allows a much shorter return line formed by the relative proximity of the high pressure pump with the opening into the high-pressure pump fuel return and the respective fuel injector.
  • the high pressure pump does not have its own drive shaft, wherein the pump cylinder head is placed in a filled with lubricating oil housing, in particular a housing of the internal combustion engine, in which a drive shaft for the high-pressure pump is arranged.
  • the high pressure pump is equipped with an electrically operated inlet valve.
  • the pump piston of the high pressure pump is sealed relative to the housing via a sealing element.
  • This sealing element Prevents fuel from getting into the housing filled with lubricating oil or vice versa lubricating oil can get into the pump working space along the pump piston.
  • the fuel is removed via a leakage line, which opens into the cylinder bore above the sealing element and which is connected to the low-pressure system.
  • the inlet valve is designed so that it can be kept closed for zero delivery of the high-pressure pump.
  • This embodiment allows - as already stated - the waiver of a metering unit, which in turn requires an overflow valve, which must be connected via an overflow to the fuel tank requires. Overall, this design contributes to a much simpler structure of the fuels! injection systems using a high-pressure pump.
  • the inlet valve has a valve pin with a valve seat cooperating with a valve seat.
  • the valve seat may be incorporated directly into the pump cylinder head or else into an intake valve housing, whereby when using an intake valve housing the entire intake valve can be preassembled and then attached to the pump cylinder head.
  • the valve pin cooperates with an armature of an electromagnet.
  • the armature is preferably pressed onto the valve pin.
  • the solenoid actuates the inlet valve, in particular during the filling phase of the pump working chamber, so that a desired amount of fuel reaches the pump working chamber with precisely metered doses.
  • the low-pressure pump is an electrically driven pump, which preferably cooperates with a pressure regulating valve. In principle, it is possible to operate the electrically operated low-pressure pump in such a way that exactly the amount of fuel to be introduced into the pump working chamber is conveyed. In terms of control technology, however, it is simpler to use the electrically operated low-pressure pump with at least approximately constant delivery. to operate the volume andmagazin Kunststoffn the unneeded amount of fuel via the pressure control valve in the fuel tank.
  • FIG. 1 is a schematic representation of the fuel injection system according to the invention. Embodiment of the invention
  • the fuel injection system illustrated in FIG. 1 is designed as a common rail injection system and has a fuel tank 1 from which an electrically operated low-pressure pump 2 delivers fuel via a fuel filter 3 into a low-pressure line 4, which is connected to an annular space 5 of an inlet valve 6 ,
  • the low-pressure pump 2 is further connected to a pressure control valve 7, is discharged via the funded by the low pressure pump 2 fuel upon reaching a predetermined pressure in the low pressure line 4 into the fuel tank 1.
  • the inlet valve 6 is part of a high pressure pump 8 of the common rail injection system and installed in a pump cylinder head 9 of the high pressure pump 8 directly or by using an inlet valve housing.
  • the high-pressure pump 8 further has an integrally formed with the pump cylinder head 9 pump cylinder 10 with a cylinder bore 1 1.
  • a pump piston 12 is moved by a mounted in a housing 13 drive shaft 14, in particular a camshaft 14, with the intermediate circuit of a roller tappet 15 translationally up and down.
  • the housing se 13 is in particular a housing of the internal combustion engine and the drive shaft 14 may be a camshaft or balance shaft of the internal combustion engine, which has an additional cam for driving the pump piston 12.
  • the interior 28 of the housing 13 is connected to the lubricating oil system of the internal combustion engine and is lubricated by lubricating oil for lubricating the particular of the bearing points of the drive shaft 14 and the roller tappet 15 and for cooling the components of lubricating oil.
  • a sealing ring 16 is used in the region of the connection to the housing 13, which cooperates with the pump piston 12 and prevents, in particular
  • a leakage line 17 is provided, which connects the sealing ring 16 to the low-pressure line 4, in particular in the area downstream of the fuel filter 3.
  • the inlet valve 6 has a valve pin 18, which is preferably formed integrally with a valve plate 19.
  • the valve plate 19 acts with a in the
  • Pump cylinder head 9 or an intake valve housing incorporated valve seat 20 which is adjacent to the annular space 5 is arranged.
  • the inlet valve 6 or its valve pin 18 cooperates with an electromagnet 21 which controls the inlet valve 6.
  • the controller is designed so that the solenoid 21 the opening stroke and closing stroke of the valve pin
  • the intake valve 6 can be kept fully closed to allow zero delivery of the high pressure pump 8.
  • In the cylinder bore 1 1 is limited by the pump cylinder head 9 and the
  • a pump working chamber 22 is formed, which is connected via a high-pressure line 23 with the check valve 24 is connected to a high-pressure accumulator 25.
  • a high-pressure accumulator 25 Connected to the high-pressure accumulator 25 is at least one fuel injector 26, which in turn is connected to a fuel return line 27, in particular the leakage fuel of the fuel injector 26 back into the low pressure line 4 upstream (or alternatively downstream) of the fuel filter 3 into the low pressure line 4 between the low pressure pump 2 and the high pressure pump 8 initiates.
  • the pump piston 12 is translationally moved up and down in the cylinder bore 11, wherein during a downward movement of the pump piston 12 via the inlet valve 6, which is controlled controlled by the solenoid 21 during this phase, fuel from the low pressure line 4 via the Annulus 5 in the pump working space 22 passes.
  • the inlet valve 6 is closed by the electromagnet 21 and the fuel located in the pump chamber 22 fuel is conveyed via the high-pressure line 23 and the check valve 24 in the high-pressure accumulator 25.
  • the fuel is required by the fuel! Njector 26 taken and controlled in an associated combustion chamber of the internal combustion engine, which is in particular a diesel fuel-powered auto-ignition internal combustion engine, injected.
  • the thus formed fuel injection system with a particular as a plug-in pump, so without its own drive shaft, formed high-pressure pump 8, the pump cylinder head 9 with the inlet valve 6 and integrally formed with the pump cylinder head 9 pump cylinder 10 including the pump piston and the roller tappet 15 and the other components as preassembled plug element are installed in the housing 13, has the particular advantage that no otherwise necessary metering unit is required with a return from the metering unit in the fuel tank 1.
  • a zero delivery of the high pressure pump 8 can be achieved without a return from the high pressure pump is required.

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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 invention relates to a fuel injection system for an internal combustion engine, comprising a low pressure system which has a low pressure pump (2) and is connected to a high pressure system which has a high pressure pump (8), said high pressure pump (8) having a pump cylinder (10) that is covered by a pump cylinder head (9) and that has a cylinder bore (11), with a pump piston (12) being able to be moved translationally in said cylinder bore (11). In addition, a pump working chamber (22) is formed in said cylinder bore (11) and enclosed by the pump piston (12) and pump cylinder head (9), said pump working chamber (22) being connected to the low pressure system by means of an electrically-actuated inlet valve (6) and being connected to a high pressure store (25) by means of a high pressure line (23) with an inserted non-return valve (24), said store being connected to at least one fuel injector (26). According to the invention, a fuel injection system is achieved which is constructed in a simple manner with a high degree of operational security by virtue of the fact that said at least one fuel injector (26) comprises a fuel return line (27) that opens into the low pressure system between the low pressure pump (2) and the high pressure pump (8).

Description

Titel:  Title:
Kraftstoffe! nspritzsvstem  Fuels! nspritzsvstem
Die vorliegende Erfindung betrifft ein Kraftstoffeinspritzsystem für eine Brennkraftmaschine, mit einem eine Niederdruckpumpe aufweisenden Niederdrucksys- tem, das mit einem eine Hochdruckpumpe aufweisenden Hochdrucksystem verschaltet ist, wobei die Hochdruckpumpe einen von einem Pumpenzylinderkopf abgedeckten und eine Zylinderbohrung aufweisenden Pumpenzylinder aufweist, wobei in der Zylinderbohrung ein Pumpenkolben translatorisch bewegbar ist, wobei weiterhin in der Zylinderbohrung ein von dem Pumpenkolben und dem Pum- penzylinderkopf eingeschlossener Pumpenarbeitsraum gebildet ist, der über ein elektrisch betätigtes Einlassventil mit dem Niederdrucksystem verbunden ist, und wobei der Pumpenarbeitsraum über eine Hochdruckleitung mit eingesetztem Rückschlagventil mit einem Hochdruckspeicher verbunden ist, der mit zumindest einem Kraftstoffinjektor verschaltet ist. The present invention relates to a fuel injection system for an internal combustion engine, comprising a low-pressure pump having low-pressure system, which is connected to a high-pressure pump having a high-pressure system, wherein the high pressure pump has a covered by a pump cylinder head and a cylinder bore having pump cylinder, wherein in the cylinder bore a pump piston is translationally movable, wherein further in the cylinder bore formed by the pump piston and the penzpenzylinderkopf pump working space is formed, which is connected via an electrically operated inlet valve to the low pressure system, and wherein the pump working space is connected via a high pressure line with inserted check valve with a high pressure accumulator which is interconnected with at least one fuel injector.
Stand der Technik State of the art
Ein derartiges Kraftstoffeinspritzsystem für eine Brennkraftmaschine ist aus der DE 10 2006 013 703 A1 bekannt. Dieses Kraftstoffeinspritzsystem weist eine Hochdruckpumpe auf, die ein elektromagnetisch betätigtes Einlassventil aufweist. Das Einlassventil ist in ein Einlassventilgehäuse eingebaut, das in den Pumpenzylinderkopf beispielsweise eingeschraubt ist. Das Einlassventil bzw. ein Ventilbolzen des Einlassventils ist mit einem Federteller verbunden, an dem sich eine Ventilfeder abstützt und das Einlassventil in die geschlossene Position be- wegt. Weiterhin umfasst den Federteller eine Hülse, die über eine Verbindungsstange mit einem Elektromagneten zusammenwirkt, der den Öffnungshub des Einlassventils begrenzt, indem der freie Bewegungsweg des Federtellers und damit der Öffnungshub des Einlassventils beschränkt wird. Der Erfindung liegt die Aufgabe zu Grunde, ein Kraftstoffeinspritzsystem bereitzustellen, dass bei hoher Betriebssicherheit einfach aufgebaut ist. Such a fuel injection system for an internal combustion engine is known from DE 10 2006 013 703 A1. This fuel injection system includes a high pressure pump having an electromagnetically actuated intake valve. The intake valve is installed in an intake valve housing that is screwed into the pump cylinder head, for example. The inlet valve or a valve pin of the inlet valve is connected to a spring plate, on which a valve spring is supported and moves the inlet valve into the closed position. Furthermore, the spring plate comprises a sleeve which cooperates via a connecting rod with an electromagnet which limits the opening stroke of the inlet valve by the free movement path of the spring plate and thus the opening stroke of the inlet valve is limited. The invention is based on the object to provide a fuel injection system that is simple in construction with high reliability.
Offenbarung der Erfindung Disclosure of the invention
Vorteile der Erfindung Advantages of the invention
Diese Aufgabe wird dadurch gelöst, dass der zumindest eine Kraftstoffinjektor einen Kraftstoffrücklauf aufweist, der in das Niederdrucksystem zwischen der Niederdruckpumpe und der Hochdruckpumpe einmündet. Über den Kraftstoffrücklauf des Kraftstoff! njektors wird insbesondere Leckagekraftstoff abgeführt, der normalerweise in den Kraftstofftank zurückgeführt wird. Erfindungsgemäß ist nun der Kraftstoffrücklauf mit dem Niederdrucksystem verbunden und mündet insbesondere in eine Niederdruckleitung ein. Dabei kann in die Niederdruckleitung ein Kraftstofffilter eingebaut sein, wobei die Rücklaufleitung bevorzugt in Strömungsrichtung vor dem Kraftstofffilter in die Niederdruckleitung einmündet, aber grundsätzlich auch stromabwärts des Kraftstofffilters in die Niederdruckleitung einmünden kann. Diese Ausgestaltung ermöglicht eine deutlich kürzer ausgebildete Rücklaufleitung durch die relative Nähe der Hochdruckpumpe mit dem in die Hochdruckpumpe einmündenden Kraftstoffrücklauf und dem jeweiligen Kraftstoffinjektor. This object is achieved in that the at least one fuel injector has a fuel return, which opens into the low pressure system between the low pressure pump and the high pressure pump. About the fuel return of the fuel! Njektors particular leakage fuel is discharged, which is normally returned to the fuel tank. According to the invention, the fuel return is now connected to the low-pressure system and in particular opens into a low-pressure line. In this case, a fuel filter may be installed in the low pressure line, wherein the return line preferably opens in the flow direction in front of the fuel filter in the low pressure line, but in principle can also open downstream of the fuel filter in the low pressure line. This embodiment allows a much shorter return line formed by the relative proximity of the high pressure pump with the opening into the high-pressure pump fuel return and the respective fuel injector.
In Weiterbildung der Erfindung weist die Hochdruckpumpe keine eigene Antriebswelle auf, wobei der Pumpenzylinderkopf in ein mit Schmieröl befülltes Gehäuse, insbesondere ein Gehäuse der Brennkraftmaschine aufgesetzt ist, in dem eine Antriebswelle für die Hochdruckpumpe angeordnet ist. Dabei ist die Hochdruckpumpe mit einem elektrisch betätigten Einlassventil ausgestattet. Durch diese Ausgestaltung kann auf eine ansonsten bei dem Verbau von Hochdruckpumpen verwendete Zumesseinheit als zusätzliches Bauteil zur Änderung der Fördermenge der Hochdruckpumpe verzichtet werden. Diese Ausgestaltung verringert den Bauteileaufwand und trägt somit bei hoher Betriebssicherheit zu einem einfachen Aufbau des Kraftstoffeinspritzsystems bei. In a further development of the invention, the high pressure pump does not have its own drive shaft, wherein the pump cylinder head is placed in a filled with lubricating oil housing, in particular a housing of the internal combustion engine, in which a drive shaft for the high-pressure pump is arranged. The high pressure pump is equipped with an electrically operated inlet valve. As a result of this refinement, it is possible to dispense with a metering unit otherwise used in the construction of high-pressure pumps as an additional component for changing the delivery rate of the high-pressure pump. This embodiment reduces the component cost and thus contributes to high reliability to a simple structure of the fuel injection system.
In Weiterbildung der Erfindung ist der Pumpenkolben der Hochdruckpumpe gegenüber dem Gehäuse über ein Dichtelement abgedichtet. Dieses Dichtelement verhindert, dass Kraftstoff in das mit Schmieröl befüllte Gehäuse gelangt bzw. umgekehrt Schmieröl entlang des Pumpenkolbens in den Pumpenarbeitsraum gelangen kann. Zur Abführung von insbesondere während eines Förderhubs entlang dem Pumpenkolben in die Zylinderbohrung zu dem Dichtelement gelangen- den Kraftstoff wird dieser über eine Leckageleitung, die oberhalb des Dichtelements in die Zylinderbohrung einmündet und die mit dem Niederdrucksystem verbunden ist, abgeführt. In a further development of the invention, the pump piston of the high pressure pump is sealed relative to the housing via a sealing element. This sealing element Prevents fuel from getting into the housing filled with lubricating oil or vice versa lubricating oil can get into the pump working space along the pump piston. In order to discharge fuel, in particular during a delivery stroke along the pump piston into the cylinder bore, to the sealing element, the fuel is removed via a leakage line, which opens into the cylinder bore above the sealing element and which is connected to the low-pressure system.
In Weiterbildung der Erfindung ist das Einlassventil so ausgebildet, so dieses für eine Nullförderung der Hochdruckpumpe geschlossen gehalten werden kann.In a further development of the invention, the inlet valve is designed so that it can be kept closed for zero delivery of the high-pressure pump.
Diese Ausgestaltung ermöglicht - wie schon ausgeführt - den Verzicht auf eine Zumesseinheit, die wiederum ein Überströmventil, das über eine Überströmleitung mit dem Kraftstofftank verschaltet sein muss, erfordert. Diese Ausgestaltung trägt insgesamt zu einem deutlich einfacheren Aufbau des Kraftstoffe! nspritzsys- tems unter Verwendung einer Hochdruckpumpe bei. This embodiment allows - as already stated - the waiver of a metering unit, which in turn requires an overflow valve, which must be connected via an overflow to the fuel tank requires. Overall, this design contributes to a much simpler structure of the fuels! injection systems using a high-pressure pump.
In weiterer Ausgestaltung der Erfindung weist das Einlassventil einen Ventilbolzen mit einem mit einem Ventilsitz zusammenwirkenden Ventilteller auf. Der Ventilsitz kann direkt in den Pumpenzylinderkopf eingearbeitet sein oder aber auch in ein Einlassventilgehäuse, wobei bei Verwendung eines Einlassventilgehäuses das gesamte Einlassventil vormontiert werden kann und dann an den Pumpenzylinderkopf angebaut werden kann. In a further embodiment of the invention, the inlet valve has a valve pin with a valve seat cooperating with a valve seat. The valve seat may be incorporated directly into the pump cylinder head or else into an intake valve housing, whereby when using an intake valve housing the entire intake valve can be preassembled and then attached to the pump cylinder head.
In Weiterbildung der Erfindung wirkt der Ventilbolzen mit einem Anker eines Elektromagneten zusammen. Dabei ist der Anker vorzugsweise auf den Ventilbolzen aufgepresst. Der Elektromagnet betätigt das Einlassventil insbesondere während der Füllphase des Pumpenarbeitsraums so, dass eine gewünschte Kraftstoffmenge genau dosiert in den Pumpenarbeitsraum gelangt. In Weiterbildung der Erfindung ist die Niederdruckpumpe eine elektrisch angetriebene Pumpe, die vorzugsweise mit einem Druckregelventil zusammenwirkt. Grundsätzlich ist es möglich, die elektrisch betriebene Niederdruckpumpe so zu betreiben, dass genau die in den Pumpenarbeitsraum einzubringende Kraftstoffmenge gefördert wird. Regelungstechnisch ist es aber einfacher, die elektrisch betriebene Niederdruckpumpe mit einem zumindest angenähert konstanten För- dervolumen zu betreiben und die nicht benötigte Kraftstoffmenge über das Druckregelventil in den Kraftstofftank abzusteuern. In a further development of the invention, the valve pin cooperates with an armature of an electromagnet. In this case, the armature is preferably pressed onto the valve pin. The solenoid actuates the inlet valve, in particular during the filling phase of the pump working chamber, so that a desired amount of fuel reaches the pump working chamber with precisely metered doses. In a further development of the invention, the low-pressure pump is an electrically driven pump, which preferably cooperates with a pressure regulating valve. In principle, it is possible to operate the electrically operated low-pressure pump in such a way that exactly the amount of fuel to be introduced into the pump working chamber is conveyed. In terms of control technology, however, it is simpler to use the electrically operated low-pressure pump with at least approximately constant delivery. to operate the volume and abzusteuern the unneeded amount of fuel via the pressure control valve in the fuel tank.
Vorteilhafte Weiterbildungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in der Figur dargestelltes Ausführungsbeispiel näher beschreiben ist. Advantageous developments of the invention can be taken from the description of the drawings, in which an embodiment shown in the figure is described in more detail.
Kurze Beschreibung der Zeichnung Es zeigt: Brief description of the drawing It shows:
Figur 1 eine schematische Darstellung des erfindungsgemäßen Kraftstoffeinspritzsystems. Ausführungsform der Erfindung Figure 1 is a schematic representation of the fuel injection system according to the invention. Embodiment of the invention
Das in Figur 1 dargestellte Kraftstoffeinspritzsystem ist als Common-Rail- Einspritzsystem ausgebildet und weist einen Kraftstofftank 1 auf aus dem eine elektrisch betriebene Niederdruckpumpe 2 Kraftstoff über einen Kraftstofffilter 3 in ei- ne Niederdruckleitung 4 fördert, die mit einem Ringraum 5 eines Einlassventils 6 verbunden ist. The fuel injection system illustrated in FIG. 1 is designed as a common rail injection system and has a fuel tank 1 from which an electrically operated low-pressure pump 2 delivers fuel via a fuel filter 3 into a low-pressure line 4, which is connected to an annular space 5 of an inlet valve 6 ,
Die Niederdruckpumpe 2 ist weiterhin mit einem Druckregelventil 7 verschaltet, über das von der Niederdruckpumpe 2 geförderter Kraftstoff bei Erreichen eines vorgegebenen Drucks in der Niederdruckleitung 4 in den Kraftstofftank 1 abgeführt wird. The low-pressure pump 2 is further connected to a pressure control valve 7, is discharged via the funded by the low pressure pump 2 fuel upon reaching a predetermined pressure in the low pressure line 4 into the fuel tank 1.
Das Einlassventil 6 ist Teil einer Hochdruckpumpe 8 des Common-Rail- Einspritzsystems und in einen Pumpenzylinderkopf 9 der Hochdruckpumpe 8 di- rekt oder unter Verwendung eines Einlassventilgehäuses eingebaut. Die Hochdruckpumpe 8 weist weiterhin einen einstückig mit dem Pumpenzylinderkopf 9 ausgebildeten Pumpenzylinder 10 mit einer Zylinderbohrung 1 1 auf. In der Zylinderbohrung 1 1 wird ein Pumpenkolben 12 von einer in einem Gehäuse 13 gelagerten Antriebswelle 14, insbesondere einer Nockenwelle 14, unter Zwischen- Schaltung eines Rollenstößels 15 translatorisch auf und ab bewegt. Das Gehäu- se 13 ist insbesondere ein Gehäuse der Brennkraftmaschine und die Antriebswelle 14 kann eine Nockenwelle oder Ausgleichswelle der Brennkraftmaschine sein, die zum Antrieb des Pumpenkolbens 12 einen zusätzlichen Nocken aufweist. Der Innenraum 28 des Gehäuses 13 ist an das Schmierölsystem der Brennkraftmaschine angeschlossen und wird von Schmieröl zur Schmierung der insbesondere der Lagerstellen der Antriebswelle 14 und des Rollenstößels 15 sowie zur Kühlung der Komponenten von Schmieröl durchströmt. In eine ringförmige Ausnehmung in der Zylinderbohrung 1 1 des Pumpenzylinders 10 ist im Bereich des Anschlusses an das Gehäuse 13 ein Dichtring 16 eingesetzt, der mit dem Pumpenkolben 12 zusammenwirkt und verhindert, dass insbesondereThe inlet valve 6 is part of a high pressure pump 8 of the common rail injection system and installed in a pump cylinder head 9 of the high pressure pump 8 directly or by using an inlet valve housing. The high-pressure pump 8 further has an integrally formed with the pump cylinder head 9 pump cylinder 10 with a cylinder bore 1 1. In the cylinder bore 1 1, a pump piston 12 is moved by a mounted in a housing 13 drive shaft 14, in particular a camshaft 14, with the intermediate circuit of a roller tappet 15 translationally up and down. The housing se 13 is in particular a housing of the internal combustion engine and the drive shaft 14 may be a camshaft or balance shaft of the internal combustion engine, which has an additional cam for driving the pump piston 12. The interior 28 of the housing 13 is connected to the lubricating oil system of the internal combustion engine and is lubricated by lubricating oil for lubricating the particular of the bearing points of the drive shaft 14 and the roller tappet 15 and for cooling the components of lubricating oil. In an annular recess in the cylinder bore 1 1 of the pump cylinder 10, a sealing ring 16 is used in the region of the connection to the housing 13, which cooperates with the pump piston 12 and prevents, in particular
Leckagekraftstoff, der entlang der Zylinderbohrung 1 1 bei der translatorischen Bewegung des Pumpenkolbens 12 in den Bereich des Dichtrings 16 gelangt, in den Innenraum 28 des Gehäuses 13 eindringt und mit dem in dem Innenraum 28 befindlichen Schmieröl vermischt wird. Um den Leckagekraftstoff aus dem Be- reich oberhalb des Dichtrings 16 abzuführen, ist eine Leckageleitung 17 vorgesehen, die den Dichtring 16 mit der Niederdruckleitung 4 insbesondere im Bereich stromabwärts des Kraftstofffilters 3 verbindet. Leakage fuel that passes along the cylinder bore 1 1 in the translational movement of the pump piston 12 in the region of the sealing ring 16, penetrates into the interior 28 of the housing 13 and is mixed with the located in the interior 28 lubricating oil. In order to discharge the leakage fuel from the region above the sealing ring 16, a leakage line 17 is provided, which connects the sealing ring 16 to the low-pressure line 4, in particular in the area downstream of the fuel filter 3.
Das Einlassventil 6 weist einen Ventilbolzen 18 auf, der mit einem Ventilteller 19 vorzugsweise einstückig ausgebildet ist. Der Ventilteller 19 wirkt mit einem in denThe inlet valve 6 has a valve pin 18, which is preferably formed integrally with a valve plate 19. The valve plate 19 acts with a in the
Pumpenzylinderkopf 9 oder einem Einlassventilgehäuse eingearbeiteten Ventilsitz 20 zusammen, der benachbart zu dem Ringraum 5 angeordnet ist. Das Einlassventil 6 bzw. dessen Ventilbolzen 18 wirkt mit einem Elektromagneten 21 zusammen, der das Einlassventil 6 steuert. Dabei ist die Steuerung so ausgelegt, dass der Elektromagnet 21 den Öffnungshub und Schließhub des VentilbolzensPump cylinder head 9 or an intake valve housing incorporated valve seat 20 which is adjacent to the annular space 5 is arranged. The inlet valve 6 or its valve pin 18 cooperates with an electromagnet 21 which controls the inlet valve 6. In this case, the controller is designed so that the solenoid 21 the opening stroke and closing stroke of the valve pin
18 in Zusammenwirken mit dem Ventilteller 19 und dem Ventilsitz 20 exakt steuert. Das Einlassventil 6 kann zur Ermöglichung einer Nullförderung der Hochdruckpumpe 8 vollständig geschlossen gehalten werden. In der Zylinderbohrung 1 1 ist begrenzt von dem Pumpenzylinderkopf 9 und dem18 in cooperation with the valve plate 19 and the valve seat 20 controls exactly. The intake valve 6 can be kept fully closed to allow zero delivery of the high pressure pump 8. In the cylinder bore 1 1 is limited by the pump cylinder head 9 and the
Pumpenkolben 12 ein Pumpenarbeitsraum 22 gebildet, der über eine Hochdruckleitung 23 mit eingeschalteten Rückschlagventil 24 mit einem Hochdruckspeicher 25 verbunden ist. Mit dem Hochdruckspeicher 25 ist zumindest ein Kraftstoffinjektor 26 verbunden, der seinerseits mit einer Kraftstoffrücklaufleitung 27 verbun- den ist, die insbesondere Leckagekraftstoff des Kraftstoffinjektors 26 zurück in die Niederdruckleitung 4 stromaufwärts (oder auch alternativ stromabwärts) des Kraftstofffilters 3 in die Niederdruckleitung 4 zwischen der Niederdruckpumpe 2 und der Hochdruckpumpe 8 einleitet. Beim Betrieb des Kraftstoffeinspritzsystems wird der Pumpenkolben 12 translatorisch in der Zylinderbohrung 1 1 auf und ab bewegt, wobei während einer Abwärtsbewegung des Pumpenkolbens 12 über das Einlassventil 6, das während dieser Phase von dem Elektromagneten 21 gesteuert geöffnet wird, Kraftstoff aus der Niederdruckleitung 4 über den Ringraum 5 in den Pumpenarbeits- räum 22 gelangt. Pump piston 12 a pump working chamber 22 is formed, which is connected via a high-pressure line 23 with the check valve 24 is connected to a high-pressure accumulator 25. Connected to the high-pressure accumulator 25 is at least one fuel injector 26, which in turn is connected to a fuel return line 27, in particular the leakage fuel of the fuel injector 26 back into the low pressure line 4 upstream (or alternatively downstream) of the fuel filter 3 into the low pressure line 4 between the low pressure pump 2 and the high pressure pump 8 initiates. During operation of the fuel injection system, the pump piston 12 is translationally moved up and down in the cylinder bore 11, wherein during a downward movement of the pump piston 12 via the inlet valve 6, which is controlled controlled by the solenoid 21 during this phase, fuel from the low pressure line 4 via the Annulus 5 in the pump working space 22 passes.
Bei der anschließenden Aufwärts bewegung des Pumpenkolbens 12 wird das Einlassventil 6 von dem Elektromagneten 21 geschlossen und der in den Pumpenarbeitsraum 22 befindliche Kraftstoff wird über die Hochdruckleitung 23 und das Rückschlagventil 24 in den Hochdruckspeicher 25 gefördert. Aus dem Hochdruckspeicher 25 wird der Kraftstoff bedarfsweise von dem Kraftstoff! njektor 26 entnommen und gesteuert in einem zugeordneten Brennraum der Brennkraftmaschine, die insbesondere eine mit Dieselkraftstoff betriebene selbstzündende Brennkraftmaschine ist, eingespritzt. In the subsequent upward movement of the pump piston 12, the inlet valve 6 is closed by the electromagnet 21 and the fuel located in the pump chamber 22 fuel is conveyed via the high-pressure line 23 and the check valve 24 in the high-pressure accumulator 25. From the high-pressure accumulator 25, the fuel is required by the fuel! Njector 26 taken and controlled in an associated combustion chamber of the internal combustion engine, which is in particular a diesel fuel-powered auto-ignition internal combustion engine, injected.
Das so ausgebildete Kraftstoffeinspritzsystem mit einer insbesondere als Steckpumpe, also ohne eigene Antriebswelle, ausgebildeten Hochdruckpumpe 8, bei der Pumpenzylinderkopf 9 mit dem Einlassventil 6 sowie mit dem einstückig mit dem Pumpenzylinderkopf 9 ausgebildeten Pumpenzylinder 10 einschließlich dem Pumpenkolben sowie dem Rollenstößel 15 und den weiteren Bauteilen als vormontiertes Steckelement in das Gehäuse 13 eingebaut sind, weist den besonderen Vorteil auf, dass keine sonst nötige Zumesseinheit mit einem Rücklauf von der Zumesseinheit in den Kraftstofftank 1 benötigt wird. Durch die vorstehend beschriebene Ausbildung des Kraftstoffeinspritzsystems kann eine Nullförderung der Hochdruckpumpe 8 erreicht werden ohne dass ein Rücklauf von der Hochdruckpumpe erforderlich ist. The thus formed fuel injection system with a particular as a plug-in pump, so without its own drive shaft, formed high-pressure pump 8, the pump cylinder head 9 with the inlet valve 6 and integrally formed with the pump cylinder head 9 pump cylinder 10 including the pump piston and the roller tappet 15 and the other components as preassembled plug element are installed in the housing 13, has the particular advantage that no otherwise necessary metering unit is required with a return from the metering unit in the fuel tank 1. By the above-described design of the fuel injection system, a zero delivery of the high pressure pump 8 can be achieved without a return from the high pressure pump is required.

Claims

Ansprüche claims
1 . Kraftstoffeinspritzsystem für eine Brennkraftmaschine mit einem eine Niederdruckpumpe (2) aufweisenden Niederdrucksystem, das mit einem eine Hochdruckpumpe (8) aufweisenden Hochdrucksystem verschaltet ist, wobei die Hochdruckpumpe (8) einen von einem Pumpenzylinder- kopf (9) abgedeckten und eine Zylinderbohrung (1 1 ) aufweisenden Pumpenzylinder (10) aufweist, wobei in der Zylinderbohrung (1 1 ) ein Pumpenkolben (12) translatorisch bewegbar ist, wobei weiterhin in der Zylinderbohrung (1 1 ) ein von dem Pumpenkolben (12) und dem Pum- penzylinderkopf (9) eingeschlossener Pumpenarbeitsraum (22) gebildet ist, der über ein elektromagnetisch betätigtes Einlassventil (6) mit dem Niederdrucksystem verbunden ist, und wobei der Pumpenarbeitsraum (22) über eine Hochdruckleitung (23) mit eingesetzten Rückschlagventil (24) mit einem Hochdruckspeicher (25) verbunden ist, der mit zumindest einem Kraftstoff! njektor (26) verschaltet ist, 1 . A fuel injection system for an internal combustion engine having a low-pressure system having a low-pressure pump (2) and being connected to a high-pressure system having a high-pressure pump (8), wherein the high-pressure pump (8) comprises a cylinder bore (9) and a cylinder bore (11). In the cylinder bore (1 1), a pump piston (12) is translationally movable, wherein further in the cylinder bore (1 1) from the pump piston (12) and the pump penz- penkopf (9) enclosed pump working space (22), which is connected via an electromagnetically operated inlet valve (6) to the low pressure system, and wherein the pump working space (22) via a high pressure line (23) with inserted check valve (24) with a high pressure accumulator (25) is connected with at least one fuel! connected to the injector (26),
dadurch gekennzeichnet, dass der zumindest eine Kraftstoffinjektor (26) einen Kraftstoffrücklauf (27) aufweist, der in das Niederdrucksystem zwischen der Niederdruckpumpe (2) und der Hochdruckpumpe (8) einmündet.  characterized in that the at least one fuel injector (26) has a fuel return (27) which opens into the low pressure system between the low pressure pump (2) and the high pressure pump (8).
2. Kraftstoffeinspritzsystem nach Anspruch 1 , 2. Fuel injection system according to claim 1,
dadurch gekennzeichnet, dass der Pumpenzylinderkopf (9) auf ein schmierölbefülltes Gehäuse (13), insbesondere ein Gehäuse (13) der Brennkraftmaschine, aufgesetzt ist.  characterized in that the pump cylinder head (9) is mounted on a lubricating oil-filled housing (13), in particular a housing (13) of the internal combustion engine.
3. Kraftstoffeinspritzsystem nach Anspruch 2, 3. Fuel injection system according to claim 2,
dadurch gekennzeichnet, dass der Pumpenkolben (12) der Hochdruckpumpe (8) gegenüber der Zylinderbohrung (1 1 ) im Bereich des Gehäuses (13) über ein Dichtelement abgedichtet ist. characterized in that the pump piston (12) of the high-pressure pump (8) relative to the cylinder bore (1 1) is sealed in the region of the housing (13) via a sealing element.
4. Kraftstoffeinspritzsystem nach Anspruch 3, 4. Fuel injection system according to claim 3,
dadurch gekennzeichnet, dass die Hochdruckpumpe oberhalb des Dichtelements eine Leckageleitung (17) aufweist, die mit dem Niederdrucksystem verbunden ist.  characterized in that the high pressure pump above the sealing element has a leakage line (17) which is connected to the low pressure system.
5. Kraftstoffeinspritzsystem nach einem der vorherigen Ansprüche, 5. Fuel injection system according to one of the preceding claims,
dadurch gekennzeichnet, dass das Einlassventil (6) für eine Nullförderung der Hochdruckpumpe (8) dicht geschlossen gehalten werden kann.  characterized in that the inlet valve (6) for zero delivery of the high-pressure pump (8) can be kept tightly closed.
6. Kraftstoffeinspritzsystem nach einem der vorherigen Ansprüche, 6. Fuel injection system according to one of the preceding claims,
dadurch gekennzeichnet, dass das Einlassventil (6) rücklaufleitungslos ausgebildet ist.  characterized in that the inlet valve (6) is formed without return line.
7. Kraftstoffeinspritzsystem nach einem der vorherigen Ansprüche, 7. Fuel injection system according to one of the preceding claims,
dadurch gekennzeichnet, dass das Einlassventil (6) einen Ventilbolzen characterized in that the inlet valve (6) is a valve pin
(18) mit einem mit einem Ventilsitz (20) zusammenwirkenden Ventilteller(18) with a valve disc cooperating with a valve seat (20)
(19) aufweist. (19).
8. Kraftstoffeinspritzsystem nach Anspruch 7, 8. Fuel injection system according to claim 7,
dadurch gekennzeichnet, dass der Ventilbolzen (18) mit einem Anker eines Elektromagneten (21 ) zusammenwirkt.  characterized in that the valve pin (18) cooperates with an armature of an electromagnet (21).
9. Kraftstoffeinspritzsystem nach einem der vorherigen Ansprüche, 9. Fuel injection system according to one of the preceding claims,
dadurch gekennzeichnet, dass die Niederdruckpumpe (2) eine elektrisch angetriebene Pumpe ist.  characterized in that the low-pressure pump (2) is an electrically driven pump.
PCT/EP2013/050137 2012-03-07 2013-01-07 Fuel injection system WO2013131661A1 (en)

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CN111868370A (en) * 2018-01-17 2020-10-30 罗伯特·博世有限公司 Fuel delivery device for cryogenic fuels

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DE10343482A1 (en) * 2003-09-19 2005-04-14 Robert Bosch Gmbh Fuel injection device for a combustion engine has high pressure pump store feedback line and filter between conveyer pump and measuring unit
EP1701031A1 (en) * 2005-03-11 2006-09-13 Hitachi, Ltd. An electromagnetic drive mechanism of a high-pressure fuel supply pump
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