WO2005038236A1 - Fuel injection device for an internal combustion engine - Google Patents

Fuel injection device for an internal combustion engine Download PDF

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Publication number
WO2005038236A1
WO2005038236A1 PCT/DE2004/001688 DE2004001688W WO2005038236A1 WO 2005038236 A1 WO2005038236 A1 WO 2005038236A1 DE 2004001688 W DE2004001688 W DE 2004001688W WO 2005038236 A1 WO2005038236 A1 WO 2005038236A1
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WO
WIPO (PCT)
Prior art keywords
fuel
pump
pressure
metering device
feed pump
Prior art date
Application number
PCT/DE2004/001688
Other languages
German (de)
French (fr)
Inventor
Stefan Kieferle
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 WO2005038236A1 publication Critical patent/WO2005038236A1/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
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail
    • 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
    • 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
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • 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

Definitions

  • the invention is based on one
  • Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is known from DE 100 02 132 AI.
  • This fuel injection device has a high-pressure pump through which fuel is injected into a. Memory is required.
  • a delivery pump is provided, through which fuel is delivered from a storage tank to the suction side of the high-pressure pump. There is a between the feed pump and the high pressure pump
  • Fuel metering device arranged by which the amount of fuel drawn in by the high pressure pump can be variably adjusted. At least one injector is connected to the memory, through which fuel is injected into the internal combustion engine. Between the
  • the feed pump and the fuel metering device return to the reservoir, which is controlled by a pressure valve.
  • the pressure valve is arranged near the high-pressure pump or integrated into it.
  • a filter is also arranged between the feed pump and the fuel metering device.
  • the return flow controlled by the pressure valve is used to set a certain pressure upstream of the fuel metering device and to return excess fuel that may be required from the feed pump to the reservoir.
  • Fuel injection device is that the total amount of fuel required by the feed pump through the Filter flows, even if it is diverted back into the storage container by the pressure valve via the return. For this reason, the filter must be designed for correspondingly large flow rates and it may have to be replaced after a short period of operation. At low temperatures, there is also a risk of the filter becoming clogged due to the constant large flow rates if the cold fuel becomes greasy. To ensure zero delivery of the high pressure pump, the connection of the fuel metering device with the
  • High-pressure pump connected to the return line which means that any fuel that does not close completely tightly is diverted from the suction side of the high-pressure pump. Since a relatively high pressure can be set in the return line depending on the fuel quantity controlled by the pressure valve, it must be ensured on the high-pressure pump that it does not draw in fuel from the return line.
  • the high-pressure pump has inlet valves which have to be set to a correspondingly high opening pressure. However, this has an adverse effect on the maximum delivery capacity of the high-pressure pump.
  • the fuel injection device according to the invention with the features according to claim 1 has the advantage that possibly too much fuel is pumped from the feed pump already in the reservoir, so that only the filter actually by the filter
  • the filter can thus be dimensioned correspondingly smaller, the operating time until it is required to be replaced can be extended and the risk of clogging due to contaminated fuel is reduced as a result
  • the opening pressure of the inlet valves of the high-pressure pump must be set low, so that their maximum delivery rate can be increased, since these have no connection with the return flow of the delivery pump in the storage container.
  • the high-pressure pump can be of simpler design, since the pressure valve can be omitted there and no connections from the pressure valve to the return are required.
  • Fuel injection device for an internal combustion engine in a schematic representation.
  • FIG. 1 shows a fuel injection device for an internal combustion engine, for example of a motor vehicle.
  • the internal combustion engine is preferably a self-igniting internal combustion engine and has one or more cylinders.
  • the motor vehicle has a fuel reservoir 10 in which fuel is stored for the operation of the internal combustion engine.
  • Fuel injection device has a feed pump 12, through which fuel is fed from the fuel reservoir 10 to a high-pressure pump 14.
  • the high-pressure pump 14 pumps fuel under high pressure into a reservoir 16, which can be tubular, for example, or in any other form.
  • From the store 16 leads at least one line 18 to at least one injector 20 arranged on a cylinder of the internal combustion engine, preferably a plurality of injectors 20 are connected to the memory 16.
  • An electrical control valve 22 is arranged on each of the injectors 20, through which an opening of the injectors is controlled, in order to thus effect fuel injection by the respective injector 20 or to prevent fuel injection.
  • the control valves 22 are controlled by an electronic control device 23, which determines the point in time and the duration of the fuel injection by the injectors 20 as a function of operating parameters of the internal combustion engine, such as, for example, speed, load, temperature and others.
  • the control valves 22 can have an electromagnetic actuator or a piezoelectric actuator.
  • a fuel return for unused fuel leads back from the injectors 20, for example via a line 24 common to all injectors 20.
  • a line 26 can also return from the accumulator 16 as a return to the fuel reservoir 10, in which a pressure limiting valve or pressure regulating valve 28 is arranged in order to prevent an impermissibly high pressure from building up in the accumulator 16 or the pressure prevailing in the accumulator 16 being able to be varied , Between the memory 16 and the injectors 20, one
  • Pressure increasing device 21 can be arranged, by means of which the pressure available for fuel injection is increased again compared to the pressure prevailing in the accumulator 16.
  • the pressure increasing device 21 is preferably integrated in the injector 20 and designed as a hydraulic pressure intensifier.
  • the fuel return 24 preferably leads away from the pressure increasing device 21 of the injectors 20.
  • the high pressure pump 14 is mechanically by the
  • the high-pressure pump 14 can be designed as a radial piston pump and has at least one or more pump elements 30, each of which has a pump piston 34 which is driven by a drive shaft 32 in a stroke movement and which delimits a pump working space 36.
  • the rotary movement of the drive shaft 32 can be converted into the lifting movement of the pump pistons 34 via an eccentric or cam drive.
  • Each pump element 30 has an inlet valve 38 opening into the pump working space 36 and an outlet valve 40 opening towards the accumulator 16.
  • a fuel metering device 42 is arranged between the feed pump 12 and the high pressure pump 14.
  • the fuel metering device 42 has a control valve 44 actuated, for example, by an electric actuator 43, preferably an electromagnet or a piezo actuator, by means of which the flow from the feed pump 12 to the high-pressure pump 14 is continuously adjustable.
  • the control valve 44 can be designed as a proportional valve through which the
  • Flow cross section between the feed pump 12 and the high pressure pump 14 is continuously variable.
  • the control valve 44 can also be opened and closed in a clocked manner, as a result of which an average effective flow cross-section between the feed pump 12 and the high-pressure pump 14 can be changed.
  • Fuel metering device 42 is preferably attached to or integrated in high-pressure pump 14, but can also be arranged separately from high-pressure pump 14. The fuel metering device 42 is operated by the
  • Control device 23 is controlled in such a way that a quantity of fuel is supplied to the high-pressure pump 14 by the feed pump 12, which in turn is then conveyed by the high-pressure pump 14 under high pressure into the accumulator 16 in order to have a predetermined pressure in the accumulator 16 which is dependent on operating parameters of the internal combustion engine maintain.
  • a pressure sensor 17 is arranged on the accumulator 16, which is connected to the control device 23 and which supplies a signal for the actual pressure in the accumulator 16.
  • the feed pump 12 has an electric drive and is arranged in the fuel tank 10.
  • a feed filter 46 is connected upstream of the feed pump 12 and a further filter 48 is arranged between the feed pump 12 and the fuel metering device 42.
  • a storage pot 50 can be arranged in the fuel reservoir 10, from which the feed pump 12 draws fuel and into which fuel is conveyed from the fuel reservoir 10 by means of a jet pump 52.
  • the propellant quantity of the jet pump 52 is supplied to it by the fuel return 26 from the accumulator 16.
  • the fuel return 24 from the injectors 20 can open into the connection between the feed pump 12 and the fuel metering device 42, for example upstream in front of the filter 48. Alternatively, the
  • Fuel return 24 of the injectors 20 also open into the return 26, which leads to the fuel reservoir 10.
  • a bypass connection 54 branches off from the connection between the filter 48 and the fuel metering device 42 to a drive region of the high-pressure pump 14.
  • the drive area of the high-pressure pump 14 is its drive shaft 32 and the area for converting the rotary movement of the drive shaft into the stroke movement of the pump pistons 34. Lubrication and cooling of the drive area is ensured by the fuel flowing into the drive area via the bypass connection 54.
  • a throttle point 55 is preferably arranged in the bypass connection 54 in order to limit the amount of fuel supplied to the drive area.
  • a return line 56 leads from the drive region of the high-pressure pump 14 to Fuel reservoir 10 back, which can open into the return 26 from the memory 16, for example. The return flow 56 ensures a constant flow through the drive area of the high-pressure pump 14.
  • a relief connection 58 leads from the connection between the fuel metering device 42 and the high-pressure pump 14, which opens into the return 26, for example.
  • a throttle point 59 is arranged, about which the
  • Relief connection 58 to limit the amount of fuel flowing out.
  • the relief connection 58 serves, in operating states in which no fuel may be conveyed into the accumulator 16 by the high-pressure pump 14, as a result of possible leakage of the fuel metering device 42, so that fuel which passes through it can still be discharged so that it is not sucked in by the high-pressure pump 14 , A low pressure prevails in the return 26, so that the opening pressure of the inlet valves 38 of the pump elements 30 can be set relatively low.
  • a check valve 60 opening towards the filter 48 is arranged.
  • a return line 62 leads between the feed pump 12 and the check valve 60
  • the return 62 preferably opens into the reservoir 50, from which the feed pump 12 sucks.
  • An at least approximately constant pressure is set by the pressure valve 64 in the connection between the feed pump 12 and the fuel metering device 42. If more fuel is delivered by the feed pump 12 than is sucked in by the high-pressure pump 14 through the fuel metering device 42 and reaches the drive area via the bypass connection 54, the excess amount is delivered
  • Fuel via the opened pressure valve 64 in the return 62 taxed.
  • Fuel via the opened pressure valve 64 in the return 62 taxed.
  • the filter 48 If the fuel quantity delivered by the feed pump 12 fluctuates as a result of voltage fluctuations in the vehicle electrical system, this is also compensated for by the pressure valve 64, so that there is an at least approximately constant pressure upstream of the fuel metering device 42.
  • the pressure level in the return 26 and thus in the relief connection 58 is not influenced by the amount of fuel that is discharged into the return 62 via the pressure valve 64.
  • the feed pump 12 draws fuel from the fuel reservoir 10 and delivers it through the fuel metering device 42 to the suction side of the high-pressure pump 14.
  • High-pressure pump 14 delivers fuel under high pressure into the reservoir 16.
  • Fuel is injected into the cylinders of the internal combustion engine by the injectors 20, the timing of the fuel injection and the injected fuel quantity being determined by the control valves 22 being controlled by the control device 23 as a function of operating parameters of the internal combustion engine.
  • the control device 23 Through the control device 23, the
  • Fuel metering device 42 is controlled in such a way that it sets such a large flow cross-section that the amount of fuel is sucked in by the high-pressure pump 14 and conveyed into the accumulator 16, which is required to maintain a predetermined pressure in the accumulator 16. If the high-pressure pump 14 draws in the entire fuel quantity delivered by the feed pump 12 and supplies it for lubrication in its drive area, then the pressure valve 64 closed and no fuel flows back into the fuel tank 10 via the return. If the delivery pump 12 delivers a larger quantity of fuel than is sucked in by the high-pressure pump 14 and is supplied for lubrication in its drive area, the pressure valve 64 opens, so that excess fuel is already diverted in the fuel reservoir 10.

Abstract

The fuel injection device comprises a high pressure pump (14), by means of which fuel is pumped under high pressure into a reservoir (16). Fuel is pumped to the inlet side of the high pressure pump (14) from a storage tank (10), by means of a supply pump (12). A fuel metering device (42) is arranged between the supply pump (12) and the high pressure pump (14), by means of which the fuel amount ingested by the high pressure pump (14) may be variably adjusted. At least one injector (20) is connected to the reservoir (16), by means of which fuel is injected into the internal combustion engine. A filter (48) is arranged between the supply pump (12) and the fuel metering device (42). A return (62), controlled by a pressure valve (64), leads off from the connection between the supply pump (12) and the fuel metering device (42), upstream of the fuel metering device, into the storage tank (10). The supply pump (12) has an electrical drive and is arranged in the storage tank (10). The return (62) leads off from the connection between the supply pump (12) and the filter (48), inside the storage tank (10).

Description

Kraftstoffeinspritzeinrichtung für eine BrennkraftmaschineFuel injection device for an internal combustion engine
Stand der TechnikState of the art
Die Erfindung geht aus von einerThe invention is based on one
Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine nach der Gattung des Anspruchs 1.Fuel injection device for an internal combustion engine according to the preamble of claim 1.
Eine solche Kraftstoffeinspritzeinrichtung ist durch die DE 100 02 132 AI bekannt. Diese Kraftstoffeinspritzeinrichtung weist eine Hochdruckpumpe auf, durch die Kraftstoff in einen. Speicher gefordert wird. Außerdem ist eine Forderpumpe vorgesehen, durch die Kraftstoff aus einem Vorratsbehalter zur Saugseite der Hochdruckpumpe gefordert wird. Zwischen der Forderpumpe und der Hochdruckpumpe ist eineSuch a fuel injection device is known from DE 100 02 132 AI. This fuel injection device has a high-pressure pump through which fuel is injected into a. Memory is required. In addition, a delivery pump is provided, through which fuel is delivered from a storage tank to the suction side of the high-pressure pump. There is a between the feed pump and the high pressure pump
KraftstoffZumesseinrichtung angeordnet, durch die die von der Hochdruckpumpe angesaugte Kraftstoffmenge variabel einstellbar ist. Mit dem Speicher ist wenigstens ein Injektor verbunden, durch den Kraftstoff an der Brennkraftmaschine eingespritzt wird. Zwischen derFuel metering device arranged by which the amount of fuel drawn in by the high pressure pump can be variably adjusted. At least one injector is connected to the memory, through which fuel is injected into the internal combustion engine. Between the
Forderpumpe und der KraftstoffZumesseinrichtung fuhrt ein Rucklauf in den Vorratsbehalter zurück, der durch ein Druckventil gesteuert wird. Das Druckventil ist dabei nahe der Hochdruckpumpe angeordnet oder in diese integriert. Zwischen der Forderpumpe und der KraftstoffZumesseinrichtung ist außerdem ein Filter angeordnet. Der durch das Druckventil gesteuerte Rucklauf dient dazu, vor der KraftstoffZumesseinrichtung einen bestimmten Druck einzustellen und eventuell von der Forderpumpe zu viel geforderten Kraftstoff in der Vorratsbehalter zurück zu leiten. Nachteilig bei der bekanntenThe feed pump and the fuel metering device return to the reservoir, which is controlled by a pressure valve. The pressure valve is arranged near the high-pressure pump or integrated into it. A filter is also arranged between the feed pump and the fuel metering device. The return flow controlled by the pressure valve is used to set a certain pressure upstream of the fuel metering device and to return excess fuel that may be required from the feed pump to the reservoir. A disadvantage of the known
Kraftstoffeinspritzeinrichtung ist, dass standig die gesamte von der Forderpumpe geforderte Kraftstoffmenge durch den Filter strömt, auch wenn diese durch das Druckventil über den Rücklauf wieder in den Vorratsbehalter abgesteuert wird. Aus diesem Grund muss der Filter für entsprechend große Durchflussmengen ausgelegt werden und dieser muss gegebenenfalls schon nach kurzer Betriebsdauer erneuert werden. Bei tiefen Temperaturen besteht aufgrund der ständigen großen Durchflussmengen außerdem die Gefahr einer Verstopfung des Filters, wenn der kalte Kraftstoff versulzt. Um eine Nullförderung der Hochdruckpumpe sicherzustellen ist die Verbindung der KraftstoffZumesseinrichtung mit derFuel injection device is that the total amount of fuel required by the feed pump through the Filter flows, even if it is diverted back into the storage container by the pressure valve via the return. For this reason, the filter must be designed for correspondingly large flow rates and it may have to be replaced after a short period of operation. At low temperatures, there is also a risk of the filter becoming clogged due to the constant large flow rates if the cold fuel becomes greasy. To ensure zero delivery of the high pressure pump, the connection of the fuel metering device with the
Hochdruckpumpe mit dem Rücklauf verbunden, wodurch eventuell noch durch die nicht ganz dicht schliessende KraftstoffZumesseinrichtung gelangender Kraftstoff von der Saugseite der Hochdruckpumpe abgeleitet wird. Da sich im Rücklauf abhängig von der durch das Druckventil abgesteuerten Kraftstoffmenge ein relativ hoher Druck einstellen kann, muss an der Hochdruckpumpe sichergestellt werden, dass diese keinen Kraftstoff aus dem Rücklauf ansaugt. Hierzu weist die Hochdruckpumpe Einlassventile auf, die auf einen entsprechend hohen Öffnungsdruck eingestellt werden müssen. Hierdurch wird jedoch die maximale Förderleistung der Hochdruckpumpe nachteilig beeinflusst.High-pressure pump connected to the return line, which means that any fuel that does not close completely tightly is diverted from the suction side of the high-pressure pump. Since a relatively high pressure can be set in the return line depending on the fuel quantity controlled by the pressure valve, it must be ensured on the high-pressure pump that it does not draw in fuel from the return line. For this purpose, the high-pressure pump has inlet valves which have to be set to a correspondingly high opening pressure. However, this has an adverse effect on the maximum delivery capacity of the high-pressure pump.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Kraftstoffeinspritzeinrichtung mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass von der Förderpumpe eventuell zu viel geförderter Kraftstoff bereits im Vorratsbehalter abgesteuert wird, so dass durch den Filter nur die tatsächlich von derThe fuel injection device according to the invention with the features according to claim 1 has the advantage that possibly too much fuel is pumped from the feed pump already in the reservoir, so that only the filter actually by the filter
Hochdruckpumpe angesaugte Kraftstoffmenge strömt. Der Filter kann somit entsprechend kleiner dimensioniert werden, die Betriebsdauer bis zu dessen erforderlichem Austausch kann verlängert werden und die Gefahr einer Verstopfung durch versulzten Kraftstoff ist infolge der verringertenHigh-pressure pump intake of fuel flows. The filter can thus be dimensioned correspondingly smaller, the operating time until it is required to be replaced can be extended and the risk of clogging due to contaminated fuel is reduced as a result
Durchflussmenge ebenfalls verringert. Außerdem kann der Öffnungsdruck der Einlassventile der Hochdruckpumpe niedrig eingestellt werden, so dass deren maximale Fördermenge erhöht werden kann, da diese keine Verbindung mit dem Rücklauf der Förderpumpe im Vorratsbehalter aufweisen. Weiterhin kann die Hochdruckpumpe einfacher ausgebildet sein, da an dieser das Druckventil entfallen kann und auch keine Verbindungen vom Druckventil zum Rücklauf erforderlich sind.Flow rate also reduced. In addition, the The opening pressure of the inlet valves of the high-pressure pump must be set low, so that their maximum delivery rate can be increased, since these have no connection with the return flow of the delivery pump in the storage container. Furthermore, the high-pressure pump can be of simpler design, since the pressure valve can be omitted there and no connections from the pressure valve to the return are required.
In den abhängigen Ansprüchen sind vorteilhafteIn the dependent claims are advantageous
Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffeinspritzeinrichtung angegeben.Refinements and developments of the fuel injection device according to the invention are specified.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Die einzige Figur zeigt eineAn embodiment of the invention is shown in the drawing and explained in more detail in the following description. The only figure shows one
Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine in schematischer Darstellung.Fuel injection device for an internal combustion engine in a schematic representation.
Beschreibung des AusführungsbeispielsDescription of the embodiment
In Figur 1 ist eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine beispielsweise eines Kraftfahrzeugs dargestellt. Die Brennkraftmaschine ist vorzugsweise eine selbstzündende Brennkraftmaschine und weist einen oder mehrere Zylinder auf. Das Kraftfahrzeug weist einen Kraftstoffvorratsbehälter 10 auf, in dem Kraftstoff für den Betrieb der Brennkraftmaschine bevorratet ist. DieFIG. 1 shows a fuel injection device for an internal combustion engine, for example of a motor vehicle. The internal combustion engine is preferably a self-igniting internal combustion engine and has one or more cylinders. The motor vehicle has a fuel reservoir 10 in which fuel is stored for the operation of the internal combustion engine. The
Kraftstoffeinspritzeinrichtung weist eine Förderpumpe 12 auf, durch die Kraftstoff aus dem Kraftstoffvorratsbehälter 10 zu einer Hochdruckpumpe 14 gefördert wird. Die Hochdruckpumpe 14 fördert Kraftstoff unter Hochdruck in einen Speicher 16, der beispielsweise rohrförmig oder in beliebiger anderer Form ausgebildet sein kann. Vom Speicher 16 führt wenigstens eine Leitung 18 zu wenigstens einem an einem Zylinder der Brennkraftmaschine angeordneten Injektor 20 ab, vorzugsweise sind mehrere Injektoren 20 mit dem Speicher 16 verbunden. An den Injektoren 20 ist jeweils ein elektrisches Steuerventil 22 angeordnet, durch das eine Öffnung der Injektoren gesteuert wird, um so eine Kraftstoffeinspritzung durch den jeweiligen Injektor 20 zu bewirken oder eine Kraftstoffeinspritzung zu verhindern. Die Steuerventile 22 werden durch eine elektronische Steuereinrichtung 23 angesteuert, durch die in Abhängigkeit von Betriebsparametern der Brennkraftmaschine, wie beispielsweise Drehzahl, Last, Temperatur und weiteren, der Zeitpunkt und die Dauer der Kraftstoffeinspritzung durch die Injektoren 20 bestimmt wird. Die Steuerventile 22 können einen elektromagnetischen Aktor oder einen piezoelektrischen Aktor aufweisen. Von den Injektoren 20 führt ein Kraftstoffrücklauf für nicht verbrauchten Kraftstoff beispielsweise über eine für alle Injektoren 20 gemeinsame Leitung 24 zurück. Vom Speicher 16 kann ebenfalls eine Leitung 26 als Rücklauf zum Kraftstoffvorratsbehälter 10 zurückführen, in der ein Druckbegrenzungsventil oder Druckregelventil 28 angeordnet ist, um zu verhindern, daß sich im Speicher 16 ein unzulässig hoher Druck aufbaut bzw. der im Speicher 16 herrschende Druck variiert werden kann. Zwischen dem Speicher 16 und den Injektoren 20 kann eineFuel injection device has a feed pump 12, through which fuel is fed from the fuel reservoir 10 to a high-pressure pump 14. The high-pressure pump 14 pumps fuel under high pressure into a reservoir 16, which can be tubular, for example, or in any other form. From the store 16 leads at least one line 18 to at least one injector 20 arranged on a cylinder of the internal combustion engine, preferably a plurality of injectors 20 are connected to the memory 16. An electrical control valve 22 is arranged on each of the injectors 20, through which an opening of the injectors is controlled, in order to thus effect fuel injection by the respective injector 20 or to prevent fuel injection. The control valves 22 are controlled by an electronic control device 23, which determines the point in time and the duration of the fuel injection by the injectors 20 as a function of operating parameters of the internal combustion engine, such as, for example, speed, load, temperature and others. The control valves 22 can have an electromagnetic actuator or a piezoelectric actuator. A fuel return for unused fuel leads back from the injectors 20, for example via a line 24 common to all injectors 20. A line 26 can also return from the accumulator 16 as a return to the fuel reservoir 10, in which a pressure limiting valve or pressure regulating valve 28 is arranged in order to prevent an impermissibly high pressure from building up in the accumulator 16 or the pressure prevailing in the accumulator 16 being able to be varied , Between the memory 16 and the injectors 20, one
Druckerhöhungseinrichtung 21 angeordnet sein, durch die der zur Kraftstoffeinspritzung zur Verfügung stehende Druck gegenüber dem im Speicher 16 herrschenden Druck nochmals erhöht wird. Die Druckerhöhungseinrichtung 21 ist vorzugsweise in den Injektor 20 integriert und als hydraulischer Druckübersetzer ausgebildet. Der Kraftstoffrücklauf 24 führt dabei vorzugsweise von der Druckerhöhungseinrichtung 21 der Injektoren 20 ab.Pressure increasing device 21 can be arranged, by means of which the pressure available for fuel injection is increased again compared to the pressure prevailing in the accumulator 16. The pressure increasing device 21 is preferably integrated in the injector 20 and designed as a hydraulic pressure intensifier. The fuel return 24 preferably leads away from the pressure increasing device 21 of the injectors 20.
Die Hochdruckpumpe 14 wird mechanisch durch dieThe high pressure pump 14 is mechanically by the
Brennkraftmaschine und damit proportional zur Drehzahl der Brennkraftmaschine angetrieben. Die Hochdruckpumpe 14 kann als Radialkolbenpumpe ausgebildet sein und weist wenigstens ein oder mehrere Pumpenelemente 30 auf, die jeweils einen durch eine Antriebswelle 32 in einer Hubbewegung angetriebenen Pumpenkolben 34 aufweisen, der einen Pumpenarbeitsraum 36 begrenzt. Die Umsetzung der Drehbewegung der Antriebswelle 32 in die Hubbewegung der Pumpenkolben 34 kann über einen Exzenter- oder Nockentrieb erfolgen. Jedes Pumpenelement 30 weist ein in den Pumpenarbeitsraum 36 öffnendes Einlassventil 38 und ein zum Speicher 16 hin öffnendes Auslassventil 40 auf. Zwischen der Förderpumpe 12 und der Hochdruckpumpe 14 ist eine KraftstoffZumesseinrichtung 42 angeordnet. Die KraftstoffZumesseinrichtung 42 weist ein beispielsweise durch einen elektrischen Aktor 43, vorzugsweise einen Elektromagneten oder einen Piezoaktor, betätigtes Regelventil 44 auf, durch das der Durchfluss von der Förderpumpe 12 zur Hochdruckpumpe 14 kontinuierlich verstellbar ist. Das Regelventil 44 kann als Proportionalventil ausgebildet sein, durch das derInternal combustion engine and thus proportional to the speed of the Internal combustion engine driven. The high-pressure pump 14 can be designed as a radial piston pump and has at least one or more pump elements 30, each of which has a pump piston 34 which is driven by a drive shaft 32 in a stroke movement and which delimits a pump working space 36. The rotary movement of the drive shaft 32 can be converted into the lifting movement of the pump pistons 34 via an eccentric or cam drive. Each pump element 30 has an inlet valve 38 opening into the pump working space 36 and an outlet valve 40 opening towards the accumulator 16. A fuel metering device 42 is arranged between the feed pump 12 and the high pressure pump 14. The fuel metering device 42 has a control valve 44 actuated, for example, by an electric actuator 43, preferably an electromagnet or a piezo actuator, by means of which the flow from the feed pump 12 to the high-pressure pump 14 is continuously adjustable. The control valve 44 can be designed as a proportional valve through which the
Durchflussquerschnitt zwischen den Förderpumpe 12 und der Hochdruckpumpe 14 kontinuierlich veränderbar ist. Alternativ kann das Regelventil 44 auch getaktet geöffnet und geschlossen werden, wodurch ein mittlerer effektiver Durchflussquerschnitt zwischen der Förderpumpe 12 und der Hochdruckpumpe 14 veränderbar ist. DieFlow cross section between the feed pump 12 and the high pressure pump 14 is continuously variable. Alternatively, the control valve 44 can also be opened and closed in a clocked manner, as a result of which an average effective flow cross-section between the feed pump 12 and the high-pressure pump 14 can be changed. The
KraftstoffZumesseinrichtung 42 ist vorzugsweise an die Hochdruckpumpe 14 angebaut oder in diese integriert, kann jedoch auch getrennt von der Hochdruckpumpe 14 angeordnet sein. Die KraftstoffZumesseinrichtung 42 wird durch dieFuel metering device 42 is preferably attached to or integrated in high-pressure pump 14, but can also be arranged separately from high-pressure pump 14. The fuel metering device 42 is operated by the
Steuereinrichtung 23 angesteuert, in der Weise, dass durch die Förderpumpe 12 eine Kraftstoffmenge der Hochdruckpumpe 14 zugeführt wird, die dann wiederum durch die Hochdruckpumpe 14 unter Hochdruck in den Speicher 16 gefördert wird, um im Speicher 16 einen vorgegebenen, von Betriebsparametern der Brennkraftmaschine abhängigen Druck aufrechtzuerhalten. Am Speicher 16 ist dabei ein Drucksensor 17 angeordnet, der mit der Steuereinrichtung 23 verbunden ist und dieser ein Signal für den tatsächlichen Druck im Speicher 16 zuführt.Control device 23 is controlled in such a way that a quantity of fuel is supplied to the high-pressure pump 14 by the feed pump 12, which in turn is then conveyed by the high-pressure pump 14 under high pressure into the accumulator 16 in order to have a predetermined pressure in the accumulator 16 which is dependent on operating parameters of the internal combustion engine maintain. A pressure sensor 17 is arranged on the accumulator 16, which is connected to the control device 23 and which supplies a signal for the actual pressure in the accumulator 16.
Die Förderpumpe 12 weist einen elektrischen Antrieb auf und ist im Kraftstoffvorratsbehälter 10 angeordnet. Der Förderpumpe 12 ist saugseitig ein Vorfilter 46 vorgeschaltet und zwischen der Förderpumpe 12 und der Kraftstoffzumesseinrichtung 42 ist ein weiterer Filter 48 angeordnet. Im Kraftstoffvorratsbehälter 10 kann ein Stautopf 50 angeordnet sein, aus dem die Förderpumpe 12 Kraftstoff ansaugt und in den mittels einer Strahlpumpe 52 Kraftstoff aus dem Kraftstoffvorratsbehälter 10 gefördert wird. Die Treibmenge der Strahlpumpe 52 wird dieser durch den Kraftstoffrücklauf 26 vom Speicher 16 zugeführt. Der Kraftstoffrücklauf 24 von den Injektoren 20 kann in die Verbindung zwischen der Förderpumpe 12 und der Kraftstoffzumesseinrichtung 42, beispielsweise stromaufwärts vor dem Filter 48 münden. Alternativ kann derThe feed pump 12 has an electric drive and is arranged in the fuel tank 10. A feed filter 46 is connected upstream of the feed pump 12 and a further filter 48 is arranged between the feed pump 12 and the fuel metering device 42. A storage pot 50 can be arranged in the fuel reservoir 10, from which the feed pump 12 draws fuel and into which fuel is conveyed from the fuel reservoir 10 by means of a jet pump 52. The propellant quantity of the jet pump 52 is supplied to it by the fuel return 26 from the accumulator 16. The fuel return 24 from the injectors 20 can open into the connection between the feed pump 12 and the fuel metering device 42, for example upstream in front of the filter 48. Alternatively, the
Kraftstoffrücklauf 24 der Injektoren 20 auch in den Rücklauf 26 münden, der zum Kraftstoffvorrtabsehälter 10 führt.Fuel return 24 of the injectors 20 also open into the return 26, which leads to the fuel reservoir 10.
Von der Verbindung zwischen dem Filter 48 und der Kraftstoffzumesseinrichtung 42 zweigt eine BypassVerbindung 54 zu einem Antriebsbereich der Hochdruckpumpe 14 ab. Der Antriebsbereich der Hochdruckpumpe 14 ist dabei deren Antriebswelle 32 sowie der Bereich der Umsetzung der Drehbewegung der Antriebswelle in die Hubbewegung der Pumpenkolben 34. Durch den über die BypassVerbindung 54 in den Antriebsbereich strömenden Kraftstoff wird eine Schmierung und Kühlung des Antriebsbereichs sichergestellt. In der Bypassverbindung 54 ist vorzugsweise eine Drosselstelle 55 angeordnet, um die dem Antriebsbereich zugeführte Kraftstoffmenge zu begrenzen. Vom Antriebsbereich der Hochdruckpumpe 14 führt ein Rücklauf 56 zum Kraftstoffvorratsbehälter 10 zurück, der beispielsweise in den Rücklauf 26 vom Speicher 16 münden kann. Durch den Rücklauf 56 ist eine ständige Durchströmung des Antriebsbereichs der Hochdruckpumpe 14 sichergestellt.A bypass connection 54 branches off from the connection between the filter 48 and the fuel metering device 42 to a drive region of the high-pressure pump 14. The drive area of the high-pressure pump 14 is its drive shaft 32 and the area for converting the rotary movement of the drive shaft into the stroke movement of the pump pistons 34. Lubrication and cooling of the drive area is ensured by the fuel flowing into the drive area via the bypass connection 54. A throttle point 55 is preferably arranged in the bypass connection 54 in order to limit the amount of fuel supplied to the drive area. A return line 56 leads from the drive region of the high-pressure pump 14 to Fuel reservoir 10 back, which can open into the return 26 from the memory 16, for example. The return flow 56 ensures a constant flow through the drive area of the high-pressure pump 14.
Von der Verbindung zwischen der Kraftstoffzumesseinrichtung 42 und der Hochdruckpumpe 14 führt eine Entlastungsverbindung 58 ab, die beispielsweise in den Rücklauf 26 mündet. In der Entlastungsverbindung 58 ist eine Drosselstelle 59 angeordnet, um die über dieA relief connection 58 leads from the connection between the fuel metering device 42 and the high-pressure pump 14, which opens into the return 26, for example. In the relief connection 58, a throttle point 59 is arranged, about which the
Entlastungsverbindung 58 abströmende Kraftstoffmenge zu begrenzen. Die Entlastungsverbindung 58 dient dazu, in Betriebszuständen, in denen durch die Hochdruckpumpe 14 kein Kraftstoff in den Speicher 16 gefördert werden darf, infolge eventueller Undichtigkeit der Kraftstoffzumesseinrichtung 42 noch durch diese hindurchtretender Kraftstoff abgeführt werden kann, so dass dieser nicht von der Hochdruckpumpe 14 angesaugt wird. Im Rücklauf 26 herrscht ein geringer Druck, so dass der Öffnungsdruck der Einlassventile 38 der Pumpenelemente 30 relativ niedrig eingestellt werden kann.Relief connection 58 to limit the amount of fuel flowing out. The relief connection 58 serves, in operating states in which no fuel may be conveyed into the accumulator 16 by the high-pressure pump 14, as a result of possible leakage of the fuel metering device 42, so that fuel which passes through it can still be discharged so that it is not sucked in by the high-pressure pump 14 , A low pressure prevails in the return 26, so that the opening pressure of the inlet valves 38 of the pump elements 30 can be set relatively low.
In der Verbindung zwischen der Förderpumpe 12 und dem Filter 48 ist ein zum Filter 48 hin öffnendes Rückschlagventil 60 angeordnet. Zwischen der Förderpumpe 12 und dem Rückschlagventil 60 führt ein Rücklauf 62 in denIn the connection between the feed pump 12 and the filter 48, a check valve 60 opening towards the filter 48 is arranged. A return line 62 leads between the feed pump 12 and the check valve 60
Kraftstoffvorratsbehälter 10 ab, der durch ein Druckventil 64 gesteuert wird. Der Rücklauf 62 mündet vorzugsweise in den Stautopf 50, aus dem die Förderpumpe 12 ansaugt. Durch das Druckventil 64 wird in der Verbindung zwischen der Förderpumpe 12 und der Kraftstoffzumesseinrichtung 42 ein zumindest annähernd konstanter Druck eingestellt. Wenn durch die Förderpumpe 12 mehr Kraftstoff gefördert wird, als von der Hochdruckpumpe 14 durch die Kraftstoffzumesseinrichtung 42 angesaugt wird und über die BypassVerbindung 54 in den Antriebsbereich gelangt, so wird der zu viel geförderteFuel reservoir 10, which is controlled by a pressure valve 64. The return 62 preferably opens into the reservoir 50, from which the feed pump 12 sucks. An at least approximately constant pressure is set by the pressure valve 64 in the connection between the feed pump 12 and the fuel metering device 42. If more fuel is delivered by the feed pump 12 than is sucked in by the high-pressure pump 14 through the fuel metering device 42 and reaches the drive area via the bypass connection 54, the excess amount is delivered
Kraftstoff über das geöffnete Druckventil 64 in den Rücklauf 62 abgesteuert. Durch den Filter 48 strömt somit nur die von der Hochdruckpumpe 14 angesaugte und die dem Antriebsbereich zugeführte Kraftstoffmenge. Wenn infolge von SpannungsSchwankungen des Bordnetzes des Kraftfahrzeugs die von der Förderpumpe 12 geförderte Kraftstoffmenge schwankt, so wird dies ebenfalls durch das Druckventil 64 ausgeglichen, so dass stromaufwärts der Kraftstoffzumesseinrichtung 42 ein zumindest annähernd konstanter Druck herrscht. Das Druckniveau im Rücklauf 26 und damit in der Entlastungsverbindung 58 wird durch die über das Druckventil 64 in den Rücklauf 62 abgesteuerte Kraftstoffmenge nicht beeinflusst.Fuel via the opened pressure valve 64 in the return 62 taxed. Thus, only the amount of fuel drawn in by the high-pressure pump 14 and supplied to the drive area flows through the filter 48. If the fuel quantity delivered by the feed pump 12 fluctuates as a result of voltage fluctuations in the vehicle electrical system, this is also compensated for by the pressure valve 64, so that there is an at least approximately constant pressure upstream of the fuel metering device 42. The pressure level in the return 26 and thus in the relief connection 58 is not influenced by the amount of fuel that is discharged into the return 62 via the pressure valve 64.
Nachfolgend wird die Funktion der Kraftstoffeinspritzeinrichtung erläutert. Beim Betrieb der Brennkraftmaschine saugt die Förderpumpe 12 Kraftstoff aus dem Kraftstoffvorratsbehälter 10 an und fördert diesen durch die Kraftstoffzumesseinrichtung 42 zur Saugseite der Hochdruckpumpe 14. Durch die Hochdruckpumpe 14 wird Kraftstoff unter Hochdruck in den Speicher 16 gefördert.The function of the fuel injection device is explained below. When the internal combustion engine is operating, the feed pump 12 draws fuel from the fuel reservoir 10 and delivers it through the fuel metering device 42 to the suction side of the high-pressure pump 14. High-pressure pump 14 delivers fuel under high pressure into the reservoir 16.
Durch die Injektoren 20 wird Kraftstoff in die Zylinder der Brennkraftmaschine eingespritzt, wobei der Zeitpunkt der Kraftstoffeinspritzung und die eingespritzte Kraftstoffmenge durch die Ansteuerung der Steuerventile 22 durch die Steuereinrichtung 23 in Abhängigkeit von Betriebsparametern der Brennkraftmaschine festgelegt wird. Durch die Steuereinrichtung 23 wird außerdem dieFuel is injected into the cylinders of the internal combustion engine by the injectors 20, the timing of the fuel injection and the injected fuel quantity being determined by the control valves 22 being controlled by the control device 23 as a function of operating parameters of the internal combustion engine. Through the control device 23, the
Kraftstoffzumesseinrichtung 42 derart angesteuert, dass diese einen so grossen Durchflussquerschnitt einstellt, dass durch die Hochdruckpumpe 14 die Kraftstoffmenge angesaugt und in den Speicher 16 gefördert wird, die erforderlich ist, um im Speicher 16 einen vorgegebenen Druck aufrechtzuerhalten. Wenn durch die gesamte von der Förderpumpe 12 geförderte Kraftstoffmenge von der Hochdruckpumpe 14 angesaugt und in deren Antriebsbereich zur Schmierung zugeführt wird, so ist das Druckventil 64 geschlossen und es fliesst kein Kraftstoff über den Rücklauf in den Kraftstoffvorratsbehalter 10 zurück. Wenn durch die Förderpumpe 12 eine größere Kraftstoffmenge gefördert wird, als von der Hochdruckpumpe 14 angesaugt wird und in deren Antriebsbereich zur Schmierung zugeführt wird, so öffnet das Druckventil 64, so dass überschüssiger Kraftstoff bereits im Kraftstoffvorratsbehälter 10 abgesteuert wird. Fuel metering device 42 is controlled in such a way that it sets such a large flow cross-section that the amount of fuel is sucked in by the high-pressure pump 14 and conveyed into the accumulator 16, which is required to maintain a predetermined pressure in the accumulator 16. If the high-pressure pump 14 draws in the entire fuel quantity delivered by the feed pump 12 and supplies it for lubrication in its drive area, then the pressure valve 64 closed and no fuel flows back into the fuel tank 10 via the return. If the delivery pump 12 delivers a larger quantity of fuel than is sucked in by the high-pressure pump 14 and is supplied for lubrication in its drive area, the pressure valve 64 opens, so that excess fuel is already diverted in the fuel reservoir 10.

Claims

Ansprüche Expectations
1. Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine mit einer Hochdruckpumpe (14) , durch, die Kraftstoff unter Hochdruck in einen Speicher (16) gefördert wird, mit einer Förderpumpe (12) , durch die Kraftstoff aus einem Vorratsbehalter (10) zur Saugseite der Hochdruckpumpe (14) gefördert wird, mit einer zwischen der Förderpumpe (12) und der Hochdruckpumpe (14) angeordneten Kraftstoffzumesseinrichtung (42), durch die die von der Hochdruckpumpe (14) angesaugte Kraftstoffmenge variabel einstellbar ist, mit wenigstens einem mit dem Speicher (16) verbundenen Injektor (20) , durch den Kraftstoff an der Brennkraftmaschine eingespritzt wird, mit einem zwischen der Förderpumpe (12) und der Kraftstoffzumesseinrichtung (42) angeordneten Filter (48) und mit einem durch ein Druckventil (64) gesteuerten Rücklauf (62) , der von der Verbindung zwischen der Förderpumpe (12) und der Kraftstoffzumesseinrichtung (42) stromaufwärts vor der Kraftstoffzumesseinrichtung (42) in den Vorratsbehalter (10) abführt, dadurch gekennzeichnet, dass die Förderpumpe (12) einen elektrischen Antrieb aufweist, im Vorratsbehalter (10) angeordnet ist und dass der Rücklauf (62) von der Verbindung zwischen der Förderpumpe (12) und dem Filter (48) innerhalb des Vorratsbehälters (10) abführt.1. Fuel injection device for an internal combustion engine with a high-pressure pump (14), through which fuel is pumped under high pressure into a memory (16), with a feed pump (12), through which fuel from a reservoir (10) to the suction side of the high-pressure pump (14 ) is conveyed with a fuel metering device (42) arranged between the feed pump (12) and the high pressure pump (14), by means of which the amount of fuel drawn in by the high pressure pump (14) can be variably adjusted, with at least one injector connected to the accumulator (16) (20), through which fuel is injected at the internal combustion engine, with a filter (48) arranged between the feed pump (12) and the fuel metering device (42) and with a return line (62) controlled by a pressure valve (64), which is operated by the Connection between the feed pump (12) and the fuel metering device (42) upstream of the fuel metering device (42) in the reservoir container (10), characterized in that the feed pump (12) has an electric drive, is arranged in the storage container (10) and that the return (62) from the connection between the feed pump (12) and the filter (48) within of the storage container (10) dissipates.
2. Kraftstoffeinspritzeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Förderpumpe (12) in einem Stauropf (50) im Vorratsbehalter (10) angeordnet ist und dass der Rücklauf (62) in den Stautopf (50) mündet. 2. Fuel injection device according to claim 1, characterized in that the feed pump (12) is arranged in a reservoir (50) in the storage container (10) and that the return (62) opens into the reservoir (50).
3. Kraftstoffeinspritzeinrichtung nach Anspruch 2, dadurch gekennzeichnet, dass vom Speicher (16) und/oder vom wenigstens einen Injektor (20) ein weiterer Rücklauf (26) zum Vorratsbehalter (10) zurückführt, mit dem wenigstens eine Strahlpumpe (52) verbunden ist, durch die Kraftstoff aus dem Vorratsbehalter (10) in den Stautopf (50) gefördert wird.3. A fuel injection device according to claim 2, characterized in that from the store (16) and / or from the at least one injector (20) returns a further return (26) to the reservoir (10), to which at least one jet pump (52) is connected, through which fuel is conveyed from the storage container (10) into the storage pot (50).
4. Kraftstoffeinspritzeinrichtung nach einem der Ansprtiche 1 bis 3, dadurch gekennzeichnet, dass zwischen der Förderpumpe4. Fuel injection device according to one of claims 1 to 3, characterized in that between the feed pump
(12) und der Kraftstoffzumesseinrichtung (42) ein zur Kraftstoffzumesseinrichtung (42) hin öffnendes Rückschlagventil (60) angeordnet ist und dass der Rückiauf(12) and the fuel metering device (42) a check valve (60) opening towards the fuel metering device (42) is arranged and that the backflow
(62) zwischen der Förderpumpe (12) und dem Rückschlagventil (60) abführt. (62) between the feed pump (12) and the check valve (60).
PCT/DE2004/001688 2003-09-19 2004-07-28 Fuel injection device for an internal combustion engine WO2005038236A1 (en)

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DE10343482.8 2003-09-19

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CN102203405A (en) * 2008-11-05 2011-09-28 欧陆汽车有限责任公司 Injection system for an internal combustion engine
US8651089B2 (en) 2008-11-05 2014-02-18 Continental Automotive Gmbh Injection system for an internal combustion engine

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