EP2032832A1 - Fuel injection device for an internal combustion engine - Google Patents

Fuel injection device for an internal combustion engine

Info

Publication number
EP2032832A1
EP2032832A1 EP07728522A EP07728522A EP2032832A1 EP 2032832 A1 EP2032832 A1 EP 2032832A1 EP 07728522 A EP07728522 A EP 07728522A EP 07728522 A EP07728522 A EP 07728522A EP 2032832 A1 EP2032832 A1 EP 2032832A1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
forderpumpe
low
fuel injection
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP07728522A
Other languages
German (de)
French (fr)
Other versions
EP2032832B1 (en
Inventor
Stefan Kieferle
Dorothee Sommer
Oliver Becker
Bjoern Noack
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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 EP2032832A1 publication Critical patent/EP2032832A1/en
Application granted granted Critical
Publication of EP2032832B1 publication Critical patent/EP2032832B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • 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

Definitions

  • the invention relates to a fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is known from DE 103 43 482 Al.
  • This fuel injection device has a Forderpumpe with an electric drive, is required by the fuel from a Kraftstoffvorratsbehalter to the suction side of a high-pressure pump.
  • the high-pressure pump fuel is required in a high pressure area, wherein in the high pressure area at least one of the
  • the fuel injection device also has an electronic control device, by means of which the fuel injection is controlled as a function of operating parameters of the internal combustion engine.
  • the fuel injection device also has an electronic control device, by means of which the fuel injection is controlled as a function of operating parameters of the internal combustion engine.
  • an electronic control device by means of which the fuel injection is controlled as a function of operating parameters of the internal combustion engine.
  • Between the Forderpumpe and the suction side of the high-pressure pump KraftstoffZumess adopted is provided, through which the fuel supply to the suction side of the high-pressure pump and thus the required by the high-pressure pump in the high-pressure region amount of fuel can be varied and is controlled by the electronic control device.
  • a pressure sensor is arranged, by which the pressure in the high-pressure region is detected and which is connected to the electronic control device, wherein by the control device
  • Fuel metering device is driven such that the high-pressure pump requires such an amount of fuel in the high pressure area, which is required to maintain a predetermined pressure in the high pressure region.
  • the Forderpumpe is operated at a substantially constant speed, so that by this a substantially constant amount of fuel is required, which must be such that the maximum fuel demand of the engine is provided. This means that the Fordermenge the Forderpumpe is in most operating conditions of the internal combustion engine outside the full load too large.
  • the excess Fordermenge the Forderpumpe is characterized by a between the Forderpumpe and the
  • the fuel injection device with the features according to claim 1 has the advantage that the Forderpumpe is operated dependent demand, whereby these can be designed in their dimensions for a lower average continuous load and the electrical power consumption for the drive over all operating conditions of the internal combustion engine averaged much lower ,
  • the operation of the Forderpumpe can be optimized for example to improve the operating conditions of the high-pressure pump.
  • the embodiment according to claim 4 has the advantage that a possible pressure drop in the passage through the fuel filter has no influence on the pressure detection in the low-pressure region.
  • the embodiment according to claims 7 and 8 has the advantage that the lubrication and / or cooling of the drive region of the high-pressure pump is improved under high load.
  • the embodiment according to claim 9 has the advantage that the lubrication and / or cooling of the drive region of the high-pressure pump at high
  • the embodiment according to claim 10 and 11 has the advantage that required by the Forderpumpe fuel, which is not sucked by the high pressure pump, can be removed from the low pressure region.
  • the embodiment according to claim 12 has the advantage that the total amount of fuel demanded by the forwarder pump is available for lubrication and / or cooling of the drive region of the high-pressure pump.
  • FIG. 1 shows a fuel injection device for an internal combustion engine in a schematic representation according to a first
  • FIG. 2 shows a diagram in which the Fordermenge a Forderpumpe and the Uberstrommenge an overflow valve is applied over the pressure prevailing in a low pressure region
  • Figure 3 shows the fuel injection device in a schematic representation according to a second exemplary embodiment. Description of the exemplary embodiments
  • Fuel injection device for an internal combustion engine for example, a motor vehicle shown.
  • the fuel injection device has a Forderpumpe 10, is sucked through the fuel from a Kraftstoffvorratsbehalter 12.
  • the Forderpumpe 10 has an electric drive 14 in the form of an electric motor and the Forderpumpe 10 may be arranged outside or as shown in Figures 1 and 3 within the Kraftstoffvorratsbehalters 12.
  • a jam or swirl pot 16 may be arranged, from which the Forderpumpe 10 sucks and is ensured by the fact that the Forderpumpe 10 even at low level in the
  • Fuel storage tank 12 can suck fuel.
  • fuel is required for example by at least one jet pump 18.
  • fuel is required to the suction side of a high-pressure pump 20 of the fuel injection device is required.
  • a fuel filter 22 is provided, through which the fuel required by the Forderpumpe 10 is cleaned before it flows to the high-pressure pump 20.
  • the high-pressure pump 20 has one or more pump elements 24, which in turn each have a guided in a cylinder bore 26 pump piston 28. By the respective pump piston 28 is in the respective
  • Cylinder bore 26 a pump working space 30 limited.
  • the respective pump pistons 28 is at least indirectly driven in a reciprocating motion by a drive shaft 32 driven in rotation by the internal combustion engine.
  • the drive shaft 32 is rotatably supported, for example, via two bearing points of a housing 34 of the high-pressure pump 14 which are spaced apart from one another in the direction of the axis of rotation of the drive shaft 32.
  • the bearings can be arranged in different parts of the Pumpengehauses 34, for example, a first bearing in a Grundkorper the Pumpengehauses 34 and a second
  • the drive shaft 32 In a region lying between the two bearing points, the drive shaft 32 has at least one cam 36 or an eccentric to its axis of rotation formed portion, wherein the cam 36 may be formed as a multiple cam.
  • the drive shaft 32 of the high-pressure pump 20 is driven by the internal combustion engine, for example, by the crankshaft or camshaft.
  • the coupling of the drive shaft 32 with the internal combustion engine can be done for example via a belt (timing belt), a chain or gears. Due to the drive of the high-pressure pump 20 by the internal combustion engine, the rotational speed of the drive shaft 32 of the high-pressure pump 20 is proportional to the rotational speed of the internal combustion engine.
  • the respective pump piston 28 can be supported directly or via a plunger 29 on the cam 36 or eccentric of the drive shaft 32.
  • Each pumping element 24 has an inlet valve 38 which opens into the pump working space 30 and through which the pump working space 30 is filled with fuel when the suction stroke of the pump piston 28 directed radially inwards towards the drive shaft 32 is filled with fuel.
  • Each pump element 24 also has an outlet valve 40 which opens out of the pump working chamber 30 and over which the Forderhub of the radially outward Forderhub Pump piston 28 compressed fuel from the pump chamber 30 is displaced.
  • the inlet valve 38 and the outlet valve 40 are each designed as spring-loaded check valves.
  • the drive shaft 32 with the cam 36 or eccentric and the Abstutzung the at least one pump piston 28 forms a arranged in the interior of the Pumpengehauses 34 drive portion 37 of the high-pressure pump 20th
  • the high-pressure pump 14 is at least one
  • a memory 42 At least one arranged on a cylinder of the internal combustion engine injector 44 is connected, is injected through the fuel into the combustion chamber of the cylinder.
  • the injectors 44 are connected directly or indirectly via hydraulic lines to the high pressure pump 14, wherein the separate memory 42 can be omitted.
  • the injector 44 has a fuel injection valve and, for example, an electrically actuated control valve, by which the opening and closing function of
  • Fuel injection valve is controlled. It can also be provided that the fuel injection valve is controlled directly by an electric actuator, for example a piezoelectric actuator.
  • the fuel injector also includes an electronic controller 46 that controls fuel injection.
  • Control device 46 the injector 44 is driven so that a predetermined amount of fuel is injected through this at a given time.
  • a pressure sensor 48 is arranged, by means of which the pressure in the high-pressure region is detected and which is connected to the control device 46. From the memory 42 For example, a connection to a relief region, for example a return to the fuel storage container 12, can be discharged, which is controlled by a pressure limiting or pressure regulating valve 43.
  • a fuel metering device 50 is provided between the feed pump 10 and the suction side of the high-pressure pump 20, which is preferably arranged between the fuel filter 22 and the suction side of the high-pressure pump 20.
  • the area between the Forderpumpe 10 and the suction side of the high pressure pump 20 is referred to below as a low pressure area.
  • the fuel metering device 50 may be designed such that a flow cross-section of different size in the connection between the Forderpumpe 10 and the suction side of the high-pressure pump 20 is adjusted by these continuously or stepwise.
  • the fuel metering device 50 may also be formed by a clocked valve which is opened and closed at a specific frequency, this releasing a certain averaged flow area in accordance with its opening duration.
  • the fuel metering device 50 may include an electric actuator 51, which may be, for example, an electromagnet or a piezoactuator, and which is controlled by the control device 46.
  • the fuel metering device 50 may also be hydraulically controlled.
  • the flow cross section is determined by a piston which is acted upon by a hydraulic pressure movable. The hydraulic pressure can be generated, for example, by the passage of the pressure control valve 43.
  • the Pressure control valve 43 can be controlled by the control device 46, so that the fuel metering device 50 is controlled indirectly via the Abêtmenge of the pressure control valve 43 by the control device 46.
  • the fuel injection device further comprises a between the Forderpumpe 10 and the
  • Kraftstoffumuminiques 50 arranged overflow valve 52, by which a connection of the low-pressure region is controlled with a discharge area.
  • Relief area is, for example, a return 53 to Kraftstoffvorratsbehalter 12, wherein in the discharge area, a lower pressure prevails than in the low pressure area.
  • the overflow valve 52 is designed as a pressure valve, which opens upon reaching a predetermined pressure in the low pressure region and let fuel flow out of the low pressure region in the discharge area.
  • the opening pressure of the overflow valve 52 is determined by a spring 54, which acts on a valve member 55 of the spill valve 52 in a closing direction.
  • the spill valve 52 is disposed downstream of the drive section 37 between it and the fuel meter 50.
  • connection upstream of the fuel metering device 50 dissipates a connection in the drive range of the high-pressure pump 20.
  • the part of the amount of fuel required by the feed pump 10 is available for the lubrication of the drive region of the high pressure pump 20, which is not supplied to the suction side of the high pressure pump 20 by the fuel metering device 50.
  • the pressure prevailing in the low-pressure region between the fuel filter 22 and the suction side of the high-pressure pump 20 is detected by a pressure sensor 56, which is connected to the control device 46.
  • the pressure sensor 56 is arranged in the low-pressure region between the fuel filter 22 and the drive region of the high-pressure pump 20, so that a possible
  • Pressure drop is considered in the flow through the fuel filter 22 in the pressure detection in the low pressure range.
  • the high-pressure pump 20 As an operating parameter in particular the Fordermenge the high-pressure pump 20 is taken into account, which corresponds to the load of the internal combustion engine.
  • the high pressure pump 20 may be to maintain a predetermined pressure in the memory 42, as more fuel is removed through the injectors 44 from the memory 42 and injected into the internal combustion engine.
  • the speed of the internal combustion engine which is proportional to the speed of the High pressure pump 20 is to be considered.
  • the fuel temperature can be taken into account by means of a
  • Fuel temperature sensor 58 is detected, which is connected to the control device 46.
  • the drive 14 of the Forderpumpe 10 is driven such that required by the Forderpumpe 10 in the low pressure range at high load, and thus large Fordermenge the high pressure pump 20, and / or high speed of the engine and the high pressure pump 20, a larger amount of fuel and so that a higher pressure is generated than at low load and Fordermenge and / or low speed. It can be provided that with increasing load of
  • the high-pressure pump 20 Internal combustion engine and thus increasing Fordermenge the high-pressure pump 20 is controlled by the controller 46 of the electric drive 14 of the Forderpumpe 10 such that demanded by the Forderpumpe 10 an increasingly larger amount of fuel and thus an increasingly higher pressure in the low pressure region is generated.
  • the demanded by the Forderpumpe 10 amount of fuel that is not sucked by the high pressure pump 20 and required in the memory 42 is controlled by the spill valve 52 in the discharge area 53. It may be provided that the amount of fuel required by the Forderpumpe 10 is increased by the control device 46 disproportionate to the fuel quantity to be demanded by the high-pressure pump 20 in order to ensure adequate lubrication and / or cooling
  • Fuel temperature required by the Forderpumpe 10 a larger amount of fuel and thus a higher pressure in the low pressure region is generated than at low fuel temperature. It may be provided that with increasing fuel temperature of the drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that required by the Forderpumpe 10 an increasing amount of fuel in the low pressure region and thus a higher pressure in the low pressure region is generated. As a result, a sufficient lubrication and / or cooling of the drive portion 37 of the high-pressure pump 20 is also ensured, since with increasing
  • Fuel temperature, the lubricating effect of the fuel is worse.
  • setpoint values for the pressure in the low-pressure region are stored in the control device 46 in a characteristic diagram, in which case the electrical drive 14 of the Forderpumpe 10 is controlled by the control device 46 such that the Forderpumpe 10 such a fuel quantity is required in the low-pressure region, like this to
  • the characteristic of the overflow valve 52 is determined so that an increasing amount of fuel is diverted into the discharge area by this with increasing pressure in the low pressure region.
  • the overflow valve 52 may, for example, have an at least approximately linear characteristic, so that, proportional to the pressure in the low-pressure region, the amount of fuel diverted by the overflow valve 52 increases.
  • FIG. 2 shows a diagram in which, by way of example, the region A is shown, in which the volume required by the delivery pump 10 Fuel quantity V is plotted against the pressure prevailing in the low pressure range pND.
  • the characteristic curve of the overflow valve 52 is shown by way of example in the diagram according to FIG. 2 with B.
  • the spill valve 52 is designed such that regardless of the setting of the
  • KraftstoffZumess Road 50 required by the Forderpumpe 10 fuel from the low pressure range can be controlled.
  • the spill valve 52 thus a variable adjustment of the pressure in the low pressure region and thus the Fordermenge the Forderpumpe 10 is made possible regardless of the demand of the high-pressure pump 20 fuel quantity.
  • the lubrication and / or cooling of the drive range of the high-pressure pump 20 can be improved as required, independently of the fuel quantity to be demanded by the high-pressure pump 20.
  • Fuel temperature, the pressure generated by the Forderpumpe 10 in the low pressure range can be kept low, what the Forderpumpe 10 requires only a small amount of fuel needs, whereby the burden of Forderpumpe 10, in particular of the electric drive 14, and thus the need for electrical energy its supply can be kept low.
  • the Forderpumpe 10 with the electric drive 14 can therefore be designed for a lower average load, wherein the Design compared to a design with a constant Fordermenge can be simplified or compared to this design an increased life can be achieved. Alternatively, even without restrictions in the life of the Forderpumpe 10 increased
  • the load of the fuel filter 22 is reduced in the variable Fordermenge the Forderpumpe 10, since it is not constantly flowed through by the maximum Fordermenge the Forderpumpe 10 but only from the actual required Fordermenge the Forderpumpe 10.
  • the fuel filter 22 can therefore compared to a conventional design for constant Fordermenge the Forderpumpe 10 are smaller or can achieve a longer life with the same dimensions.
  • the fuel injection device is shown according to a second exemplary embodiment, in which compared to the first exemplary embodiment, the fuel metering device and optionally the spill valve can be omitted.
  • the Forderpumpe 10 has the electric drive 14, by the
  • Control device 46 is driven. Between the Forderpumpe 10 and the suction side of the high pressure pump 20, the fuel filter 22 is arranged and in the low pressure region between the fuel filter 22 and the suction side of the high-pressure pump 20, the pressure sensor 56 is arranged, which is connected to the control device 46, wherein the pressure detected by the pressure sensor 56 in the low-pressure region serves as a controlled variable for the control device 46 in the control of the drive 14 of the Forderpumpe 10.
  • the pressure sensor 48 can be arranged in the high-pressure region, by which the pressure in the high-pressure region is detected and which is connected to the control device 46. In the high pressure area, the pressure regulating or pressure limiting valve 43 can also be provided. Between the Forderpumpe 10 and the fuel filter 22, a pressure limiting valve 60 is arranged to prevent damage to the Forderpumpe 10 and / or the fuel filter 22 at too high pressure.
  • fuel injection device required by the Forderpumpe 10 amount of fuel for variable adjustment of the sucked by the high pressure pump 20 and required in the high pressure area fuel quantity can be variably adjusted.
  • the pressure generated by the Forderpumpe 10 in the low pressure region can be kept substantially constant within predetermined limits.
  • the drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that the Forderpumpe 10 such a large Fordermenge to the suction side of the high-pressure pump 20 is required and by the
  • High pressure pump 20 is required in the memory 42, which is required to maintain a predetermined pressure in the memory 42.
  • an increasing amount of fuel in the memory 42 and accordingly by the Forderpumpe 10 an increasing amount of fuel to the suction side of the high-pressure pump 20 are required to maintain the predetermined pressure in the low pressure range.
  • the fuel metering device 50 can be omitted.
  • an operating parameter of the internal combustion engine and the high-pressure pump 20 may preferably be taken into account by the control device 46 and a pilot control of the pressure in the low pressure region carried out such that with increasing speed through the
  • Forderpumpe 10 requires a larger amount of fuel and a higher pressure in the low pressure range is generated. In particular, when idling the internal combustion engine, the demanded by the Froderpumpe 10 amount of fuel and thus the pressure in the low pressure region can be kept low, whereby the required drive power for the Forderpumpe 10 is kept low.
  • the high-pressure pump 20 may be provided as in the first exemplary embodiment, the fuel metering device 50.
  • At least a portion of the amount of fuel required by the Forderpumpe 10 in the low pressure range is supplied to the drive portion 37 of the high-pressure pump 20 for lubrication and / or cooling.
  • the drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that by the Forderpumpe 10 always a minimum amount of fuel is required, which is necessary to ensure adequate lubrication and / or cooling of the drive portion 37 of the high-pressure pump 20.
  • monitoring of the low-pressure region for leakage can also be realized since a leak can be concluded from a rapid pressure drop in the low-pressure region.
  • variable leakage at the high pressure pump due to wear only slow pressure drops in the low pressure region occur, so that here a clear distinction is possible. If a leakage is detected by the control device 46, so for example, the further operation of the internal combustion engine can be prevented or a warning to be given to the vehicle driver.

Abstract

The fuel injection device for an internal combustion engine comprises a feed pump which has an electric drive, by which feed pump fuel is fed from a fuel storage tank into a low-pressure region to the suction side of at least one high-pressure pump. The high-pressure pump pumps fuel into a high-pressure region in which at least one injector is provided to inject the fuel into the internal combustion engine. The fuel injection is controlled by an electric control device. Arranged in the low-pressure region is a pressure sensor which is connected to the control device. The electric drive of the feed pump is activated by the control device in order to set a feed quantity of the feed pump which is variable as a function of at least one operating parameter of the internal combustion engine and/or of the high-pressure pump. The drive of the feed pump is in particular activated by the control device in such a way that, at a high load of the internal combustion engine and/or at a high rotational speed and/or at a high fuel temperature, a greater fuel quantity is fed by the feed pump into the low-pressure region than at a low load and/or a low rotational speed and/or a low fuel temperature.

Description

Beschreibungdescription
Titeltitle
Kraftstoffeinspritzeinrichtung für eine BrennkraftmaschineFuel injection device for an internal combustion engine
Stand der TechnikState of the art
Die Erfindung geht aus von einer Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine nach der Gattung des Anspruchs 1.The invention relates to a fuel injection device for an internal combustion engine according to the preamble of claim 1.
Eine solche Kraftstoffeinspritzeinrichtung ist durch die DE 103 43 482 Al bekannt. Diese Kraftstoffeinspritzeinrichtung weist eine Forderpumpe mit einem elektrischen Antrieb auf, durch die Kraftstoff aus einem Kraftstoffvorratsbehalter zur Saugseite einer Hochdruckpumpe gefordert wird. Durch die Hochdruckpumpe wird Kraftstoff in einen Hochdruckbereich gefordert, wobei im Hochdruckbereich wenigstens ein an derSuch a fuel injection device is known from DE 103 43 482 Al. This fuel injection device has a Forderpumpe with an electric drive, is required by the fuel from a Kraftstoffvorratsbehalter to the suction side of a high-pressure pump. By the high-pressure pump fuel is required in a high pressure area, wherein in the high pressure area at least one of the
Brennkraftmaschine angeordneter Injektor vorgesehen ist, durch den Kraftstoff an der Brennkraftmaschine eingespritzt wird. Die Kraftstoffeinspritzeinrichtung weist außerdem eine elektronische Steuereinrichtung auf, durch die die Kraftstoffeinspritzung abhangig von Betriebsparametern der Brennkraftmaschine gesteuert wird. Zwischen der Forderpumpe und der Saugseite der Hochdruckpumpe ist eine KraftstoffZumesseinrichtung vorgesehen, durch die die Kraftstoffzufuhrung zur Saugseite der Hochdruckpumpe und damit die durch die Hochdruckpumpe in den Hochdruckbereich geforderte Kraftstoffmenge variiert werden kann und die durch die elektronische Steuereinrichtung angesteuert wird. Im Hochdruckbereich ist dabei ein Drucksensor angeordnet, durch den der Druck im Hochdruckbereich erfasst wird und der mit der elektronischen Steuereinrichtung verbunden ist, wobei durch die Steuereinrichtung dieInternal combustion engine arranged injector is provided, is injected by the fuel to the internal combustion engine. The fuel injection device also has an electronic control device, by means of which the fuel injection is controlled as a function of operating parameters of the internal combustion engine. Between the Forderpumpe and the suction side of the high-pressure pump KraftstoffZumesseinrichtung is provided, through which the fuel supply to the suction side of the high-pressure pump and thus the required by the high-pressure pump in the high-pressure region amount of fuel can be varied and is controlled by the electronic control device. In the high pressure area, a pressure sensor is arranged, by which the pressure in the high-pressure region is detected and which is connected to the electronic control device, wherein by the control device
KraftstoffZumesseinrichtung derart angesteuert wird, dass die Hochdruckpumpe eine solche Kraftstoffmenge in den Hochdruckbereich fordert, die erforderlich ist, um im Hochdruckbereich einen vorgegebenen Druck aufrecht zu erhalten. Die Forderpumpe wird mit im wesentlichen konstanter Drehzahl betrieben, so dass durch diese eine im wesentlichen konstante Kraftstoffmenge gefordert wird, die derart bemessen sein muss, dass der maximale Kraftstoffbedarf der Brennkraftmaschine zur Verfugung gestellt wird. Dies bedeutet, dass die Fordermenge der Forderpumpe in den meisten Betriebszustanden der Brennkraftmaschine außerhalb der Vollast zu groß ist. Die überschüssige Fordermenge der Forderpumpe wird durch ein zwischen der Forderpumpe und derFuel metering device is driven such that the high-pressure pump requires such an amount of fuel in the high pressure area, which is required to maintain a predetermined pressure in the high pressure region. The Forderpumpe is operated at a substantially constant speed, so that by this a substantially constant amount of fuel is required, which must be such that the maximum fuel demand of the engine is provided. This means that the Fordermenge the Forderpumpe is in most operating conditions of the internal combustion engine outside the full load too large. The excess Fordermenge the Forderpumpe is characterized by a between the Forderpumpe and the
KraftstoffZumesseinrichtung angeordnetes Überströmventil in einen Entlastungsbereich abgesteuert. Die Forderpumpe muss dabei sehr groß und für entsprechende Dauerbelastung dimensioniert werden, was zu hohen Herstellungskosten und zu einem großen elektrischen Leistungsbedarf für deren Antrieb fuhrt.Shut-off valve disposed overflow valve in a discharge area. The Forderpumpe must be very large and dimensioned for appropriate continuous load, which leads to high production costs and a large electrical power requirement for their drive.
Offenbarung der ErfindungDisclosure of the invention
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemaße Kraftstoffeinspritzeinrichtung mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass die Forderpumpe bedarfsabhangig betrieben wird, wodurch diese in ihrer Dimensionierung für eine geringere mittlere Dauerbelastung ausgelegt werden kann und der elektrische Leistungsbedarf für deren Antrieb über alle Betriebszustande der Brennkraftmaschine gemittelt wesentlich geringer ist. Der Betrieb der Forderpumpe kann dabei beispielsweise zur Verbesserung der Betriebsbedingungen der Hochdruckpumpe optimiert werden.The fuel injection device according to the invention with the features according to claim 1 has the advantage that the Forderpumpe is operated dependent demand, whereby these can be designed in their dimensions for a lower average continuous load and the electrical power consumption for the drive over all operating conditions of the internal combustion engine averaged much lower , The operation of the Forderpumpe can be optimized for example to improve the operating conditions of the high-pressure pump.
In den abhangigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemaßen Kraftstoffeinspritzeinrichtung angegeben. Die Ausbildung gemäß Anspruch 4 hat den Vorteil, dass ein möglicher Druckabfall bei der Durchstromung des Kraftstofffilters keinen Einfluss auf die Druckerfassung im Niederdruckbereich hat. Die Ausbildung gemäß den Ansprüchen 7 und 8 hat den Vorteil, dass die Schmierung und/oder Kühlung des Antriebsbereichs der Hochdruckpumpe bei hoher Belastung verbessert ist. Die Ausbildung gemäß Anspruch 9 hat den Vorteil, dass die Schmierung und/oder Kühlung des Antriebsbereichs der Hochdruckpumpe bei hohenIn the dependent claims advantageous refinements and developments of the inventive fuel injection device are given. The embodiment according to claim 4 has the advantage that a possible pressure drop in the passage through the fuel filter has no influence on the pressure detection in the low-pressure region. The embodiment according to claims 7 and 8 has the advantage that the lubrication and / or cooling of the drive region of the high-pressure pump is improved under high load. The embodiment according to claim 9 has the advantage that the lubrication and / or cooling of the drive region of the high-pressure pump at high
Kraftstofftemperaturen verbessert ist. Die Ausbildung gemäß Anspruch 10 und 11 hat den Vorteil, dass von der Forderpumpe geforderter Kraftstoff, der nicht von der Hochdruckpumpe angesaugt wird, aus dem Niederdruckbereich abgeführt werden kann. Die Ausbildung gemäß Anspruch 12 hat den Vorteil, dass die gesamte von der Froderpumpe geforderte Kraftstoffmenge zur Schmierung und/oder Kühlung des Antriebsbereichs der Hochdruckpumpe zur Verfugung steht.Fuel temperatures is improved. The embodiment according to claim 10 and 11 has the advantage that required by the Forderpumpe fuel, which is not sucked by the high pressure pump, can be removed from the low pressure region. The embodiment according to claim 12 has the advantage that the total amount of fuel demanded by the forwarder pump is available for lubrication and / or cooling of the drive region of the high-pressure pump.
Mehrere Ausfuhrungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung naher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine in schematischer Darstellung gemäß einem erstenSeveral exemplary embodiments of the invention are illustrated in the drawing and explained in more detail in the following description. 1 shows a fuel injection device for an internal combustion engine in a schematic representation according to a first
Ausfuhrungsbeispiel, Figur 2 ein Diagramm, in dem die Fordermenge einer Forderpumpe und der Uberstrommenge eines Überströmventils über dem in einem Niederdruckbereich herrschenden Druck auftragen ist, und Figur 3 die Kraftstoffeinspritzeinrichtung in schematischer Darstellung gemäß einem zweiten Ausfuhrungsbeispiel. Beschreibung der Ausfuhrungsbeispiele2 shows a diagram in which the Fordermenge a Forderpumpe and the Uberstrommenge an overflow valve is applied over the pressure prevailing in a low pressure region, and Figure 3 shows the fuel injection device in a schematic representation according to a second exemplary embodiment. Description of the exemplary embodiments
In den Figuren 1 und 3 ist schematisch eineIn the figures 1 and 3 is schematically a
Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine beispielsweise eines Kraftfahrzeugs dargestellt. Die Kraftstoffeinspritzeinrichtung weist eine Forderpumpe 10 auf, durch die Kraftstoff aus einem Kraftstoffvorratsbehalter 12 angesaugt wird. Die Forderpumpe 10 weist einen elektrischen Antrieb 14 in Form eines Elektromotors auf und die Forderpumpe 10 kann außerhalb oder wie in den Figuren 1 und 3 dargestellt innerhalb des Kraftstoffvorratsbehalters 12 angeordnet sein. Innerhalb des Kraftstoffvorratsbehalters 12 kann ein Stautopf oder Schwalltopf 16 angeordnet sein, aus dem die Forderpumpe 10 ansaugt und durch den sichergestellt ist, dass die Forderpumpe 10 auch bei geringem Füllstand imFuel injection device for an internal combustion engine, for example, a motor vehicle shown. The fuel injection device has a Forderpumpe 10, is sucked through the fuel from a Kraftstoffvorratsbehalter 12. The Forderpumpe 10 has an electric drive 14 in the form of an electric motor and the Forderpumpe 10 may be arranged outside or as shown in Figures 1 and 3 within the Kraftstoffvorratsbehalters 12. Within the Kraftstoffvorratsbehalters 12, a jam or swirl pot 16 may be arranged, from which the Forderpumpe 10 sucks and is ensured by the fact that the Forderpumpe 10 even at low level in the
Kraftstoffvorratsbehalter 12 Kraftstoff ansaugen kann. In den Schwalltopf 16 wird Kraftstoff beispielsweise durch wenigstens eine Strahlpumpe 18 gefordert. Durch die Forderpumpe 10 wird Kraftstoff zur Saugseite einer Hochdruckpumpe 20 der Kraftstoffeinspritzeinrichtung gefordert. Zwischen der Forderpumpe 10 und der Saugseite der Hochdruckpumpe 20 ist ein Kraftstofffilter 22 vorgesehen, durch den der von der Forderpumpe 10 geforderte Kraftstoff gereinigt wird, bevor er der Hochdruckpumpe 20 zufließt.Fuel storage tank 12 can suck fuel. In the baffle 16 fuel is required for example by at least one jet pump 18. By the Forderpumpe 10 fuel to the suction side of a high-pressure pump 20 of the fuel injection device is required. Between the Forderpumpe 10 and the suction side of the high-pressure pump 20, a fuel filter 22 is provided, through which the fuel required by the Forderpumpe 10 is cleaned before it flows to the high-pressure pump 20.
Die Hochdruckpumpe 20 weist ein oder mehrere Pumpenelemente 24 auf, die wiederum jeweils einen in einer Zylinderbohrung 26 geführten Pumpenkolben 28 aufweisen. Durch den jeweiligen Pumpenkolben 28 wird in der jeweiligenThe high-pressure pump 20 has one or more pump elements 24, which in turn each have a guided in a cylinder bore 26 pump piston 28. By the respective pump piston 28 is in the respective
Zylinderbohrung 26 ein Pumpenarbeitsraum 30 begrenzt. Der jeweilige Pumpenkolben 28 wird durch eine durch die Brennkraftmaschine rotierend angetriebene Antriebswelle 32 zumindest mittelbar in einer Hubbewegung angetrieben. Die Antriebswelle 32 ist beispielsweise über zwei in Richtung der Drehachse der Antriebswelle 32 voneinander beabstandete Lagerstellen eines Gehäuses 34 der Hochdruckpumpe 14 drehbar gelagert. Die Lagerstellen können in verschiedenen Teilen des Pumpengehauses 34 angeordnet sein, beispielsweise kann eine erste Lagerstelle in einem Grundkorper des Pumpengehauses 34 und eine zweiteCylinder bore 26 a pump working space 30 limited. Of the respective pump pistons 28 is at least indirectly driven in a reciprocating motion by a drive shaft 32 driven in rotation by the internal combustion engine. The drive shaft 32 is rotatably supported, for example, via two bearing points of a housing 34 of the high-pressure pump 14 which are spaced apart from one another in the direction of the axis of rotation of the drive shaft 32. The bearings can be arranged in different parts of the Pumpengehauses 34, for example, a first bearing in a Grundkorper the Pumpengehauses 34 and a second
Lagerstelle in einem mit dem Grundkorper verbundenen Flanschteil angeordnet sein. In einem zwischen den beiden Lagerstellen liegenden Bereich weist die Antriebswelle 32 wenigstens einen Nocken 36 oder einen exzentrisch zu ihrer Drehachse ausgebildeten Abschnitt auf, wobei der Nocken 36 auch als Mehrfachnocken ausgebildet sein kann. Die Antriebswelle 32 der Hochdruckpumpe 20 wird durch die Brennkraftmaschine angetrieben, beispielsweise von deren Kurbelwelle oder Nockenwelle. Die Kopplung der Antriebswelle 32 mit der Brennkraftmaschine kann beispielsweise über einen Riemen (Zahnriemen), eine Kette oder Zahnrader erfolgen. Infolge des Antriebs der Hochdruckpumpe 20 durch die Brennkraftmaschine ist die Drehzahl der Antriebswelle 32 der Hochdruckpumpe 20 proportional zur Drehzahl der Brennkraftmaschine.Bearing be arranged in a connected to the basic body flange. In a region lying between the two bearing points, the drive shaft 32 has at least one cam 36 or an eccentric to its axis of rotation formed portion, wherein the cam 36 may be formed as a multiple cam. The drive shaft 32 of the high-pressure pump 20 is driven by the internal combustion engine, for example, by the crankshaft or camshaft. The coupling of the drive shaft 32 with the internal combustion engine can be done for example via a belt (timing belt), a chain or gears. Due to the drive of the high-pressure pump 20 by the internal combustion engine, the rotational speed of the drive shaft 32 of the high-pressure pump 20 is proportional to the rotational speed of the internal combustion engine.
Der jeweilige Pumpenkolben 28 kann sich direkt oder über einen Stößel 29 am Nocken 36 oder Exzenter der Antriebswelle 32 abstutzen. Jedes Pumpenelement 24 weist ein Einlassventil 38 auf, das in den Pumpenarbeitsraum 30 öffnet und über das der Pumpenarbeitsraum 30 beim radial nach innen zur Antriebswelle 32 gerichteten Saughub des Pumpenkolbens 28 mit Kraftstoff befullt wird. Jedes Pumpenelement 24 weist außerdem ein Auslassventil 40 auf, das aus dem Pumpenarbeitsraum 30 heraus öffnet und über das der beim radial nach außen gerichteten Forderhub des Pumpenkolbens 28 verdichtete Kraftstoff aus dem Pumpenarbeitsraum 30 verdrangt wird. Das Einlassventil 38 und das Auslassventil 40 sind jeweils als federbelastete Ruckschlagventile ausgebildet. Die Antriebswelle 32 mit dem Nocken 36 oder Exzenter sowie der Abstutzung des wenigstens einen Pumpenkolbens 28 bildet einen im Inneren des Pumpengehauses 34 angeordneten Antriebsbereich 37 der Hochdruckpumpe 20.The respective pump piston 28 can be supported directly or via a plunger 29 on the cam 36 or eccentric of the drive shaft 32. Each pumping element 24 has an inlet valve 38 which opens into the pump working space 30 and through which the pump working space 30 is filled with fuel when the suction stroke of the pump piston 28 directed radially inwards towards the drive shaft 32 is filled with fuel. Each pump element 24 also has an outlet valve 40 which opens out of the pump working chamber 30 and over which the Forderhub of the radially outward Forderhub Pump piston 28 compressed fuel from the pump chamber 30 is displaced. The inlet valve 38 and the outlet valve 40 are each designed as spring-loaded check valves. The drive shaft 32 with the cam 36 or eccentric and the Abstutzung the at least one pump piston 28 forms a arranged in the interior of the Pumpengehauses 34 drive portion 37 of the high-pressure pump 20th
Durch die Hochdruckpumpe 14 wird über wenigstens eineBy the high-pressure pump 14 is at least one
Leitung Kraftstoff in einen Hochdruckbereich gefordert, in dem beispielsweise ein Speicher 42 angeordnet ist. Mit dem Speicher 42 ist wenigstens ein an einem Zylinder der Brennkraftmaschine angeordneter Injektor 44 verbunden, durch den Kraftstoff in den Brennraum des Zylinders eingespritzt wird. Es kann auch vorgesehen sein, dass die Injektoren 44 direkt oder indirekt über hydraulische Leitungen mit der Hochdruckpumpe 14 verbunden sind, wobei der separate Speicher 42 entfallen kann. Der Injektor 44 weist ein Kraftstoffeinspritzventil und beispielsweise ein elektrisch betätigtes Steuerventil auf, durch das die Offnungs- und Schließfunktion desLine fuel demanded in a high pressure area in which, for example, a memory 42 is arranged. With the memory 42 at least one arranged on a cylinder of the internal combustion engine injector 44 is connected, is injected through the fuel into the combustion chamber of the cylinder. It can also be provided that the injectors 44 are connected directly or indirectly via hydraulic lines to the high pressure pump 14, wherein the separate memory 42 can be omitted. The injector 44 has a fuel injection valve and, for example, an electrically actuated control valve, by which the opening and closing function of
Kraftstoffeinspritzventils gesteuert wird. Es kann auch vorgesehen sein, dass das Kraftstoffeinspritzventil direkt durch einen elektrischen Aktor, beispielsweise einen Piezoaktor, gesteuert wird.Fuel injection valve is controlled. It can also be provided that the fuel injection valve is controlled directly by an electric actuator, for example a piezoelectric actuator.
Die Kraftstoffeinspritzeinrichtung weist außerdem eine elektronische Steuereinrichtung 46 auf, durch die die Kraftstoffeinspritzung gesteuert wird. Durch dieThe fuel injector also includes an electronic controller 46 that controls fuel injection. By the
Steuereinrichtung 46 wird der Injektor 44 angesteuert, so dass durch diesen zu einem vorgegebenen Zeitpunkt eine vorgegebene Kraftstoffmenge eingespritzt wird. Im Hochdruckbereich ist ein Drucksensor 48 angeordnet, durch den der Druck im Hochdruckbereich erfasst wird und der mit der Steuereinrichtung 46 verbunden ist. Vom Speicher 42 kann eine Verbindung zu einem Entlastungsbereich, beispielsweise einem Rucklauf zum Kraftstoffvorratsbehalter 12, abfuhren, die von einem Druckbegrenzungs- oder Druckregelventil 43 gesteuert wird.Control device 46, the injector 44 is driven so that a predetermined amount of fuel is injected through this at a given time. In the high-pressure region, a pressure sensor 48 is arranged, by means of which the pressure in the high-pressure region is detected and which is connected to the control device 46. From the memory 42 For example, a connection to a relief region, for example a return to the fuel storage container 12, can be discharged, which is controlled by a pressure limiting or pressure regulating valve 43.
Bei dem in Figur 1 dargestellten ersten Ausfuhrungsbeispiel ist zwischen der Forderpumpe 10 und der Saugseite der Hochdruckpumpe 20 eine KraftstoffZumesseinrichtung 50 vorgesehen, die vorzugsweise zwischen dem Kraftstofffilter 22 und der Saugseite der Hochdruckpumpe 20 angeordnet ist. Der Bereich zwischen der Forderpumpe 10 und der Saugseite der Hochdruckpumpe 20 wird nachfolgend als Niederdruckbereich bezeichnet. Die KraftstoffZumesseinrichtung 50 kann derart ausgebildet sein, dass durch diese kontinuierlich oder stufenweise ein unterschiedlich großer Durchflussquerschnitt in der Verbindung zwischen der Forderpumpe 10 und der Saugseite der Hochdruckpumpe 20 eingestellt wird. Alternativ kann die KraftstoffZumesseinrichtung 50 auch durch ein getaktetes Ventil gebildet sein, dass mit einer bestimmten Frequenz geöffnet und geschlossen wird, wobei dieses entsprechend dessen Offnungsdauer einen bestimmten gemittelten Durchflussquerschnitt freigibt. Die KraftstoffZumesseinrichtung 50 kann einen elektrischen Aktor 51 aufweisen, der beispielsweise ein Elektromagnet oder ein Piezoaktor sein kann, und der durch die Steuereinrichtung 46 angesteuert wird. Alternativ kann die KraftstoffZumesseinrichtung 50 auch hydraulisch gesteuert sein. Hierbei wird der Durchflussquerschnitt durch einen Kolben bestimmt, der von einem hydraulischen Druck beaufschlagt bewegbar ist. Der hydraulische Druck kann beispielsweise durch den Ablauf des Druckregelventils 43 erzeugt werden. Dabei ergibt sich mit zunehmender Absteuermenge des Druckregelventils 43 ein höherer Druck, durch den der durch die KraftstoffZumesseinrichtung 50 freigegebene Durchflussquerschnitt verringert wird. Das Druckregelventil 43 kann durch die Steuereinrichtung 46 angesteuert werden, so dass die KraftstoffZumesseinrichtung 50 mittelbar über die Absteuermenge des Druckregelventils 43 durch die Steuereinrichtung 46 gesteuert wird.In the first exemplary embodiment shown in FIG. 1, a fuel metering device 50 is provided between the feed pump 10 and the suction side of the high-pressure pump 20, which is preferably arranged between the fuel filter 22 and the suction side of the high-pressure pump 20. The area between the Forderpumpe 10 and the suction side of the high pressure pump 20 is referred to below as a low pressure area. The fuel metering device 50 may be designed such that a flow cross-section of different size in the connection between the Forderpumpe 10 and the suction side of the high-pressure pump 20 is adjusted by these continuously or stepwise. Alternatively, the fuel metering device 50 may also be formed by a clocked valve which is opened and closed at a specific frequency, this releasing a certain averaged flow area in accordance with its opening duration. The fuel metering device 50 may include an electric actuator 51, which may be, for example, an electromagnet or a piezoactuator, and which is controlled by the control device 46. Alternatively, the fuel metering device 50 may also be hydraulically controlled. Here, the flow cross section is determined by a piston which is acted upon by a hydraulic pressure movable. The hydraulic pressure can be generated, for example, by the passage of the pressure control valve 43. In this case, with increasing Absteuermenge of the pressure control valve 43, a higher pressure, through which the released by the fuel metering 50 flow cross-section is reduced. The Pressure control valve 43 can be controlled by the control device 46, so that the fuel metering device 50 is controlled indirectly via the Absteuermenge of the pressure control valve 43 by the control device 46.
Die Kraftstoffeinspritzeinrichtung weist weiterhin ein zwischen der Forderpumpe 10 und derThe fuel injection device further comprises a between the Forderpumpe 10 and the
KraftstoffZumesseinrichtung 50 angeordnetes Überströmventil 52 auf, durch das eine Verbindung des Niederdruckbereichs mit einem Entlastungsbereich gesteuert wird. DerKraftstoffumuminrichtung 50 arranged overflow valve 52, by which a connection of the low-pressure region is controlled with a discharge area. Of the
Entlastungsbereich ist dabei beispielsweise ein Rucklauf 53 zum Kraftstoffvorratsbehalter 12, wobei im Entlastungsbereich ein niedrigerer Druck herrscht als im Niederdruckbereich. Das Überströmventil 52 ist als Druckventil ausgebildet, das bei Erreichen eines vorgegebenen Drucks im Niederdruckbereich öffnet und Kraftstoff aus dem Niederdruckbereich in den Entlastungsbereich abströmen lasst. Der Offnungsdruck des Überströmventils 52 wird durch eine Feder 54 bestimmt, die ein Ventilglied 55 des Überströmventils 52 in einer Schließrichtung beaufschlagt.Relief area is, for example, a return 53 to Kraftstoffvorratsbehalter 12, wherein in the discharge area, a lower pressure prevails than in the low pressure area. The overflow valve 52 is designed as a pressure valve, which opens upon reaching a predetermined pressure in the low pressure region and let fuel flow out of the low pressure region in the discharge area. The opening pressure of the overflow valve 52 is determined by a spring 54, which acts on a valve member 55 of the spill valve 52 in a closing direction.
Bei dem in Figur 1 dargestellten ersten Ausfuhrungsbeispiel fuhrt die Verbindung zwischen der Forderpumpe 10 und der Saugseite der Hochdruckpumpe 20 durch den Antriebsbereich 37 der Hochdruckpumpe 20, in dem die Antriebswelle 32 mit ihren Lagerstellen und der Exzenter oder Nocken 36 mit der Abstutzung des wenigstens einen Pumpenkolbens 28 oder Stoßeis 29 angeordnet ist. Das Überströmventil 52 ist stromabwärts nach dem Antriebsbereich 37 zwischen diesem und der KraftstoffZumesseinrichtung 50 angeordnet. Somit durchströmt die gesamte durch die Forderpumpe 10 geforderte Kraftstoffmenge zunächst den Antriebsbereich der Hochdruckpumpe 20 bevor dieser von der Hochdruckpumpe 20 angesaugt wird. Alternativ kann auch vorgesehen sein, dass von der von der Forderpumpe 10 herfuhrenden Verbindung stromaufwärts vor der KraftstoffZumesseinrichtung 50 eine Verbindung in den Antriebsbereich der Hochdruckpumpe 20 abfuhrt. Hierbei steht jedoch nur der Teil der von der Forderpumpe 10 geforderten Kraftstoffmenge für die Schmierung des Antriebsbereichs der Hochdruckpumpe 20 zur Verfugung, der nicht durch die KraftstoffZumesseinrichtung 50 der Saugseite der Hochdruckpumpe 20 zugeführt wird.In the first embodiment shown in Figure 1, the connection between the Forderpumpe 10 and the suction side of the high-pressure pump 20 through the drive portion 37 of the high-pressure pump 20, in which the drive shaft 32 with their bearings and the eccentric or cam 36 with the Abstutzung the at least one pump piston 28 or shock ice 29 is arranged. The spill valve 52 is disposed downstream of the drive section 37 between it and the fuel meter 50. Thus, the entire required by the Forderpumpe 10 amount of fuel first flows through the drive range of the high-pressure pump 20 before it is sucked by the high-pressure pump 20. Alternatively, it can also be provided that of the herfuhrenden of the Forderpumpe 10 connection upstream of the fuel metering device 50 dissipates a connection in the drive range of the high-pressure pump 20. However, only the part of the amount of fuel required by the feed pump 10 is available for the lubrication of the drive region of the high pressure pump 20, which is not supplied to the suction side of the high pressure pump 20 by the fuel metering device 50.
Der im Niederdruckbereich zwischen dem Kraftstofffilter 22 und der Saugseite der Hochdruckpumpe 20 herrschende Druck wird durch einen Drucksensor 56 erfasst, der mit der Steuereinrichtung 46 verbunden ist. Vorzugsweise ist der Drucksensor 56 im Niederdruckbereich zwischen dem Kraftstofffilter 22 und dem Antriebsbereich der Hochdruckpumpe 20 angeordnet, so dass ein eventuellerThe pressure prevailing in the low-pressure region between the fuel filter 22 and the suction side of the high-pressure pump 20 is detected by a pressure sensor 56, which is connected to the control device 46. Preferably, the pressure sensor 56 is arranged in the low-pressure region between the fuel filter 22 and the drive region of the high-pressure pump 20, so that a possible
Druckabfall bei der Durchstromung des Kraftstofffilters 22 bei der Druckerfassung im Niederdruckbereich berücksichtigt ist. Erfindungsgemaß ist vorgesehen, dass der elektrische Antrieb 14 der Forderpumpe 10 durch die Steuereinrichtung 46 abhangig von wenigstens einem Betriebsparameter der Brennkraftmaschine und/oder der Hochdruckpumpe 20 zur Einstellung einer veränderlichen Fordermenge der Forderpumpe 10 und damit eines veränderlichen Druckes im Niederdruckbereich zwischen der Forderpumpe 10 und der Saugseite der Hochdruckpumpe 20 angesteuert wird.Pressure drop is considered in the flow through the fuel filter 22 in the pressure detection in the low pressure range. According to the invention it is provided that the electric drive 14 of the Forderpumpe 10 by the control device 46 depending on at least one operating parameter of the internal combustion engine and / or the high-pressure pump 20 for setting a variable Fordermenge the Forderpumpe 10 and thus a variable pressure in the low pressure region between the Forderpumpe 10 and Suction side of the high pressure pump 20 is driven.
Als Betriebsparameter wird dabei insbesondere die Fordermenge der Hochdruckpumpe 20 berücksichtigt, die zur Last der Brennkraftmaschine korrespondiert. Je hoher die Last der Brennkraftmaschine ist, desto großer muss dieAs an operating parameter in particular the Fordermenge the high-pressure pump 20 is taken into account, which corresponds to the load of the internal combustion engine. The higher the load of the internal combustion engine, the bigger the need
Fordermenge der Hochdruckpumpe 20 sein, um im Speicher 42 einen vorgegebenen Druck aufrechtzuerhalten, da mehr Kraftstoff durch die Injektoren 44 aus dem Speicher 42 entnommen und an der Brennkraftmaschine eingespritzt wird. Als weiterer Betriebsparameter kann die Drehzahl der Brennkraftmaschine, die proportional zur Drehzahl der Hochdruckpumpe 20 ist, berücksichtigt werden. Als weiterer Betriebsparameter kann die Kraftstofftemperatur berücksichtigt werden, die mittels einesFordermenge the high pressure pump 20 may be to maintain a predetermined pressure in the memory 42, as more fuel is removed through the injectors 44 from the memory 42 and injected into the internal combustion engine. As another operating parameter, the speed of the internal combustion engine, which is proportional to the speed of the High pressure pump 20 is to be considered. As a further operating parameter, the fuel temperature can be taken into account by means of a
Kraftstofftemperatursensors 58 erfasst wird, der mit der Steuereinrichtung 46 verbunden ist.Fuel temperature sensor 58 is detected, which is connected to the control device 46.
Durch die Steuereinrichtung 46 wird der Antrieb 14 der Forderpumpe 10 derart angesteuert, dass durch die Forderpumpe 10 in den Niederdruckbereich bei hoher Last, und damit großer Fordermenge der Hochdruckpumpe 20, und/oder hoher Drehzahl der Brennkraftmaschine und der Hochdruckpumpe 20 eine größere Kraftstoffmenge gefordert und damit ein höherer Druck erzeugt wird als bei geringer Last und Fordermenge und/oder geringer Drehzahl. Es kann dabei vorgesehen sein, dass mit zunehmender Last derBy the control device 46, the drive 14 of the Forderpumpe 10 is driven such that required by the Forderpumpe 10 in the low pressure range at high load, and thus large Fordermenge the high pressure pump 20, and / or high speed of the engine and the high pressure pump 20, a larger amount of fuel and so that a higher pressure is generated than at low load and Fordermenge and / or low speed. It can be provided that with increasing load of
Brennkraftmaschine und damit zunehmender Fordermenge der Hochdruckpumpe 20 durch die Steuereinrichtung 46 der elektrische Antrieb 14 der Forderpumpe 10 derart angesteuert wird, dass durch die Forderpumpe 10 eine zunehmend größere Kraftstoffmenge gefordert und damit ein zunehmend höherer Druck im Niederdruckbereich erzeugt wird. Die von der Forderpumpe 10 geforderte Kraftstoffmenge, die nicht durch die Hochdruckpumpe 20 angesaugt und in den Speicher 42 gefordert wird, wird durch das Überströmventil 52 in den Entlastungsbereich 53 abgesteuert. Es kann dabei vorgesehen sein, dass durch die Steuereinrichtung 46 die durch die Forderpumpe 10 geforderte Kraftstoffmenge uberproportional zu der durch die Hochdruckpumpe 20 zu fordernden Kraftstoffmenge erhöht wird, um eine ausreichende Schmierung und/oder Kühlung desInternal combustion engine and thus increasing Fordermenge the high-pressure pump 20 is controlled by the controller 46 of the electric drive 14 of the Forderpumpe 10 such that demanded by the Forderpumpe 10 an increasingly larger amount of fuel and thus an increasingly higher pressure in the low pressure region is generated. The demanded by the Forderpumpe 10 amount of fuel that is not sucked by the high pressure pump 20 and required in the memory 42 is controlled by the spill valve 52 in the discharge area 53. It may be provided that the amount of fuel required by the Forderpumpe 10 is increased by the control device 46 disproportionate to the fuel quantity to be demanded by the high-pressure pump 20 in order to ensure adequate lubrication and / or cooling
Antriebsbereichs 37 der Hochdruckpumpe 20 sicherzustellen. Eine Abfuhrung der von der Forderpumpe 10 überschüssig geforderten Kraftstoffmenge aus dem Niederdruckbereich ist durch das Überströmventil 52 sichergestellt. Alternativ oder zusatzlich kann vorgesehen sein, dass durch die Steuereinrichtung 46 der Antrieb 14 der Forderpumpe 10 derart angesteuert wird, dass bei hoherDrive section 37 of the high-pressure pump 20 to ensure. A discharge of the excessively demanded by the Forderpumpe 10 amount of fuel from the low pressure region is ensured by the spill valve 52. Alternatively or additionally, it may be provided that the drive 14 of the Forderpumpe 10 is controlled by the control device 46 such that at high
Kraftstofftemperatur durch die Forderpumpe 10 eine größere Kraftstoffmenge gefordert und damit ein höherer Druck im Niederdruckbereich erzeugt wird als bei niedriger Kraftstofftemperatur . Es kann dabei vorgesehen sein, dass mit zunehmender Kraftstofftemperatur der Antrieb 14 der Forderpumpe 10 durch die Steuereinrichtung 46 derart angesteuert wird, dass durch die Forderpumpe 10 eine zunehmende Kraftstoffmenge in den Niederdruckbereich gefordert und damit ein höherer Druck im Niederdruckbereich erzeugt wird. Hierdurch wird ebenfalls eine ausreichende Schmierung und/oder Kühlung des Antriebsbereichs 37 der Hochdruckpumpe 20 sichergestellt, da mit zunehmenderFuel temperature required by the Forderpumpe 10 a larger amount of fuel and thus a higher pressure in the low pressure region is generated than at low fuel temperature. It may be provided that with increasing fuel temperature of the drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that required by the Forderpumpe 10 an increasing amount of fuel in the low pressure region and thus a higher pressure in the low pressure region is generated. As a result, a sufficient lubrication and / or cooling of the drive portion 37 of the high-pressure pump 20 is also ensured, since with increasing
Kraftstofftemperatur die Schmierwirkung des Kraftstoffs schlechter wird.Fuel temperature, the lubricating effect of the fuel is worse.
Vorzugsweise sind Sollwerte für den Druck im Niederdruckbereich in der Steuereinrichtung 46 in einem Kennfeld gespeichert, wobei dann durch die Steuereinrichtung 46 der elektrische Antrieb 14 der Forderpumpe 10 derart angesteuert wird, dass durch die Forderpumpe 10 eine solche Kraftstoffmenge in den Niederdruckbereich gefordert wird, wie diese zurPreferably, setpoint values for the pressure in the low-pressure region are stored in the control device 46 in a characteristic diagram, in which case the electrical drive 14 of the Forderpumpe 10 is controlled by the control device 46 such that the Forderpumpe 10 such a fuel quantity is required in the low-pressure region, like this to
Einstellung des Sollwerts des Drucks erforderlich ist. Die Charakteristik des Überströmventils 52 ist so bestimmt, dass durch dieses mit zunehmendem Druck im Niederdruckbereich eine zunehmende Kraftstoffmenge in den Entlastungsbereich abgesteuert wird. Das Überströmventil 52 kann beispielsweise eine zumindest annähernd lineare Kennlinie besitzen, so dass proportional zum Druck im Niederdruckbereich die durch das Überströmventil 52 abgesteuerte Kraftstoffmenge zunimmt. In Figur 2 ist ein Diagramm dargestellt, in dem beispielhaft der Bereich A dargestellt, in dem die von der Forderpumpe 10 geforderte Kraftstoffmenge V über dem im Niederdruckbereich herrschenden Druck pND aufgetragen ist. Außerdem ist im Diagramm gemäß Figur 2 mit B beispielhaft die Kennlinie des Überströmventils 52 dargestellt, das ist die durch dieses abgesteuerte Kraftstoffmenge V abhangig von dem im Niederdruckbereich herrschenden Druck pND. Der Arbeitsbereich des Überströmventils 52, das ist der Druckbereich, in dem durch das Überströmventil 52 Kraftstoff aus dem Niederdruckbereich abgesteuert wird, ist in Figur 3 mit C gekennzeichnet.Adjustment of the set point of pressure is required. The characteristic of the overflow valve 52 is determined so that an increasing amount of fuel is diverted into the discharge area by this with increasing pressure in the low pressure region. The overflow valve 52 may, for example, have an at least approximately linear characteristic, so that, proportional to the pressure in the low-pressure region, the amount of fuel diverted by the overflow valve 52 increases. FIG. 2 shows a diagram in which, by way of example, the region A is shown, in which the volume required by the delivery pump 10 Fuel quantity V is plotted against the pressure prevailing in the low pressure range pND. In addition, the characteristic curve of the overflow valve 52 is shown by way of example in the diagram according to FIG. 2 with B. This is the quantity of fuel V which is diverted by this fuel, depending on the pressure pND prevailing in the low-pressure region. The working range of the overflow valve 52, which is the pressure range in which fuel is removed from the low-pressure region by the overflow valve 52, is marked C in FIG.
Das Überströmventil 52 ist derart ausgelegt, dass durch dieses unabhängig von der Einstellung derThe spill valve 52 is designed such that regardless of the setting of the
KraftstoffZumesseinrichtung 50 von der Forderpumpe 10 geforderter Kraftstoff aus dem Niederdruckbereich abgesteuert werden kann. Durch das Überströmventil 52 wird somit eine veränderliche Einstellung des Druckes im Niederdruckbereich und damit der Fordermenge der Forderpumpe 10 ermöglicht unabhängig von der von der Hochdruckpumpe 20 zu fordernden Kraftstoffmenge. Hierdurch kann die Schmierung und/oder Kühlung des Antriebsbereichs der Hochdruckpumpe 20 bedarfsabhangig verbessert werden, unabhängig von der von der Hochdruckpumpe 20 zu fordernden Kraftstoffmenge .KraftstoffZumesseinrichtung 50 required by the Forderpumpe 10 fuel from the low pressure range can be controlled. By the spill valve 52 thus a variable adjustment of the pressure in the low pressure region and thus the Fordermenge the Forderpumpe 10 is made possible regardless of the demand of the high-pressure pump 20 fuel quantity. As a result, the lubrication and / or cooling of the drive range of the high-pressure pump 20 can be improved as required, independently of the fuel quantity to be demanded by the high-pressure pump 20.
Bei geringer Belastung der Hochdruckpumpe 20, das heißt geringer Fordermenge und/oder niedrigerAt low load of the high pressure pump 20, that is low Fordermenge and / or lower
Kraftstofftemperatur, kann der durch die Forderpumpe 10 im Niederdruckbereich erzeugte Druck gering gehalten werden, wozu die Forderpumpe 10 nur eine geringe Kraftstoffmenge zu fordern braucht, wodurch die Belastung der Forderpumpe 10, insbesondere von deren elektrischem Antrieb 14, und damit der Bedarf an elektrischer Energie für dessen Versorgung gering gehalten werden kann. Die Forderpumpe 10 mit dem elektrischen Antrieb 14 kann daher auf eine geringere durchschnittliche Belastung ausgelegt werden, wobei deren Ausgestaltung gegenüber einer Auslegung mit konstanter Fordermenge vereinfacht werden kann oder gegenüber dieser Auslegung eine erhöhte Lebensdauer erreicht werden kann. Alternativ kann auch ohne Einschränkungen bei der Lebensdauer der Forderpumpe 10 eine erhöhteFuel temperature, the pressure generated by the Forderpumpe 10 in the low pressure range can be kept low, what the Forderpumpe 10 requires only a small amount of fuel needs, whereby the burden of Forderpumpe 10, in particular of the electric drive 14, and thus the need for electrical energy its supply can be kept low. The Forderpumpe 10 with the electric drive 14 can therefore be designed for a lower average load, wherein the Design compared to a design with a constant Fordermenge can be simplified or compared to this design an increased life can be achieved. Alternatively, even without restrictions in the life of the Forderpumpe 10 increased
Spitzenbelastung mit großer Fordermenge der Forderpumpe 10 zugelassen werden, da diese jeweils nur für kurze Zeit erforderlich ist.Peak load with large Fordermenge the Forderpumpe 10 are allowed, since this is only required for a short time.
Daruberhinaus ist bei der veränderlichen Fordermenge der Forderpumpe 10 die Belastung des Kraftstofffilters 22 verringert, da dieser nicht standig von der maximalen Fordermenge der Forderpumpe 10 durchströmt wird sondern nur von der tatsachlich erforderlichen Fordermenge der Forderpumpe 10. Der Kraftstofffilter 22 kann daher gegenüber einer konventionellen Auslegung für konstante Fordermenge der Forderpumpe 10 kleiner dimensioniert werden bzw. kann bei gleicher Dimensionierung eine längere Lebensdauer erreichen. Außerdem kann ein infolge Verschmutzung des Kraftstofffilters 22 bei dessenDaruberhinaus the load of the fuel filter 22 is reduced in the variable Fordermenge the Forderpumpe 10, since it is not constantly flowed through by the maximum Fordermenge the Forderpumpe 10 but only from the actual required Fordermenge the Forderpumpe 10. The fuel filter 22 can therefore compared to a conventional design for constant Fordermenge the Forderpumpe 10 are smaller or can achieve a longer life with the same dimensions. In addition, due to contamination of the fuel filter 22 at its
Durchstromung auftretender Druckabfall zumindest teilweise durch die Forderpumpe 10 ausgeglichen werden, indem die von dieser geforderte Kraftstoffmenge erhöht wird.Durchstromung occurring pressure drop can be at least partially offset by the Forderpumpe 10 by the amount of fuel required by this is increased.
In Figur 3 ist die Kraftstoffeinspritzeinrichtung gemäß einem zweiten Ausfuhrungsbeispiel dargestellt, bei dem gegenüber dem ersten Ausfuhrungsbeispiel die KraftstoffZumesseinrichtung und gegebenenfalls das Überströmventil entfallen können. Die Forderpumpe 10 weist den elektrischen Antrieb 14 auf, der durch dieIn Figure 3, the fuel injection device is shown according to a second exemplary embodiment, in which compared to the first exemplary embodiment, the fuel metering device and optionally the spill valve can be omitted. The Forderpumpe 10 has the electric drive 14, by the
Steuereinrichtung 46 angesteuert wird. Zwischen der Forderpumpe 10 und der Saugseite der Hochdruckpumpe 20 ist der Kraftstofffilter 22 angeordnet und im Niederdruckbereich zwischen dem Kraftstofffilter 22 und der Saugseite der Hochdruckpumpe 20 ist der Drucksensor 56 angeordnet, der mit der Steuereinrichtung 46 verbunden ist, wobei der vom Drucksensor 56 erfasste Druck im Niederdruckbereich als Regelgroße für die Steuereinrichtung 46 bei der Ansteuerung des Antriebs 14 der Forderpumpe 10 dient. Im Hochdruckbereich kann zusatzlich der Drucksensor 48 angeordnet sein, durch den der Druck im Hochdruckbereich erfasst wird und der mit der Steuereinrichtung 46 verbunden ist. Im Hochdruckbereich kann außerdem das Druckregel- oder Druckbegrenzungsventil 43 vorgesehen sein. Zwischen der Forderpumpe 10 und dem Kraftstofffilter 22 ist ein Druckbegrenzungsventil 60 angeordnet, um eine Beschädigung der Forderpumpe 10 und/oder des Kraftstofffilters 22 bei zu hohem Druck zu vermeiden.Control device 46 is driven. Between the Forderpumpe 10 and the suction side of the high pressure pump 20, the fuel filter 22 is arranged and in the low pressure region between the fuel filter 22 and the suction side of the high-pressure pump 20, the pressure sensor 56 is arranged, which is connected to the control device 46, wherein the pressure detected by the pressure sensor 56 in the low-pressure region serves as a controlled variable for the control device 46 in the control of the drive 14 of the Forderpumpe 10. In addition, the pressure sensor 48 can be arranged in the high-pressure region, by which the pressure in the high-pressure region is detected and which is connected to the control device 46. In the high pressure area, the pressure regulating or pressure limiting valve 43 can also be provided. Between the Forderpumpe 10 and the fuel filter 22, a pressure limiting valve 60 is arranged to prevent damage to the Forderpumpe 10 and / or the fuel filter 22 at too high pressure.
Beim zweiten Ausfuhrungsbeispiel der Kraftstoffeinspritzeinrichtung kann die von der Forderpumpe 10 geforderte Kraftstoffmenge zur veränderlichen Einstellung der von der Hochdruckpumpe 20 angesaugten und in den Hochdruckbereich geforderten Kraftstoffmenge variabel eingestellt werden. Der durch die Forderpumpe 10 im Niederdruckbereich erzeugte Druck kann dabei innerhalb vorgegebener Grenzen im wesentlichen konstant gehalten werden. Der Antrieb 14 der Forderpumpe 10 wird dabei durch die Steuereinrichtung 46 derart angesteuert, dass durch die Forderpumpe 10 eine so große Fordermenge zur Saugseite der Hochdruckpumpe 20 gefordert wird und durch dieIn the second exemplary embodiment of the fuel injection device required by the Forderpumpe 10 amount of fuel for variable adjustment of the sucked by the high pressure pump 20 and required in the high pressure area fuel quantity can be variably adjusted. The pressure generated by the Forderpumpe 10 in the low pressure region can be kept substantially constant within predetermined limits. The drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that the Forderpumpe 10 such a large Fordermenge to the suction side of the high-pressure pump 20 is required and by the
Hochdruckpumpe 20 in den Speicher 42 gefordert wird, die erforderlich ist, um im Speicher 42 einen vorgegebenen Druck aufrechtzuerhalten. Mit zunehmender Last der Brennkraftmaschine muss durch die Hochdruckpumpe 20 eine zunehmende Kraftstoffmenge in den Speicher 42 gefordert werden und entsprechend muss durch die Forderpumpe 10 eine zunehmende Kraftstoffmenge zur Saugseite der Hochdruckpumpe 20 gefordert werden, um im Niederdruckbereich den vorgegebenen Druck aufrecht zu erhalten. Die KraftstoffZumesseinrichtung 50 kann dabei entfallen. Als Betriebsparameter der Brennkraftmaschine und der Hochdruckpumpe 20 kann vorzugsweise deren Drehzahl durch die Steuereinrichtung 46 berücksichtigt werden und eine Vorsteuerung des Drucks im Niederdruckbereich derart erfolgen, dass mit zunehmender Drehzahl durch dieHigh pressure pump 20 is required in the memory 42, which is required to maintain a predetermined pressure in the memory 42. With increasing load of the engine must be required by the high-pressure pump 20, an increasing amount of fuel in the memory 42 and accordingly by the Forderpumpe 10 an increasing amount of fuel to the suction side of the high-pressure pump 20 are required to maintain the predetermined pressure in the low pressure range. The fuel metering device 50 can be omitted. As an operating parameter of the internal combustion engine and the high-pressure pump 20 may preferably be taken into account by the control device 46 and a pilot control of the pressure in the low pressure region carried out such that with increasing speed through the
Forderpumpe 10 eine größere Kraftstoffmenge gefordert und ein höherer Druck im Niederdruckbereich erzeugt wird. Insbesondere im Leerlauf der Brennkraftmaschine kann die von der Froderpumpe 10 geforderte Kraftstoffmenge und damit der Druck im Niederdruckbereich gering gehalten werden, wodurch die erforderliche Antriebsleistung für die Forderpumpe 10 gering gehalten wird. Für dieForderpumpe 10 requires a larger amount of fuel and a higher pressure in the low pressure range is generated. In particular, when idling the internal combustion engine, the demanded by the Froderpumpe 10 amount of fuel and thus the pressure in the low pressure region can be kept low, whereby the required drive power for the Forderpumpe 10 is kept low. For the
Fordermengenverstellung der Hochdruckpumpe 20 kann wie beim ersten Ausfuhrungsbeispiel die KraftstoffZumesseinrichtung 50 vorgesehen sein.Fordermengenverstellung the high-pressure pump 20 may be provided as in the first exemplary embodiment, the fuel metering device 50.
Es kann vorgesehen sein, dass zumindest ein Teil der von der Forderpumpe 10 in den Niederdruckbereich geforderten Kraftstoffmenge dem Antriebsbereich 37 der Hochdruckpumpe 20 zur Schmierung und/oder Kühlung zugeführt wird.It may be provided that at least a portion of the amount of fuel required by the Forderpumpe 10 in the low pressure range is supplied to the drive portion 37 of the high-pressure pump 20 for lubrication and / or cooling.
Vorzugsweise wird der Antrieb 14 der Forderpumpe 10 durch die Steuereinrichtung 46 derart angesteuert, dass durch die Forderpumpe 10 immer eine Mindestkraftstoffmenge gefordert wird, die erforderlich ist, um ausreichende Schmierung und/oder Kühlung des Antriebsbereichs 37 der Hochdruckpumpe 20 sicherzustellen.Preferably, the drive 14 of the Forderpumpe 10 is controlled by the controller 46 such that by the Forderpumpe 10 always a minimum amount of fuel is required, which is necessary to ensure adequate lubrication and / or cooling of the drive portion 37 of the high-pressure pump 20.
Bei der Kraftstoffeinspritzeinrichtung gemäß dem zweiten Ausfuhrungsbeispiel kann außerdem eine Überwachung des Niederdruckbereichs auf Leckage realisiert werden, da aus einem schnellen Druckabfall im Niederdruckbereich auf ein Leck geschlossen werden kann. Bei über der Betriebsdauer der Hochdruckpumpe 20 auftretender veränderlicher Leckage an der Hochdruckpumpe infolge von Verschleiß treten nur langsame Druckabsenkungen im Niederdruckbereich auf, so dass hier eine eindeutige Unterscheidung möglich ist. Wenn durch die Steuereinrichtung 46 eine Leckage erkannt wird, so kann beispielsweise der weitere Betrieb der Brennkraftmaschine verhindert werden oder ein Warnhinweis an den Fahrzeugfuhrer gegeben werden. In the case of the fuel injection device according to the second exemplary embodiment, monitoring of the low-pressure region for leakage can also be realized since a leak can be concluded from a rapid pressure drop in the low-pressure region. When occurring over the period of operation of the high pressure pump 20 variable leakage at the high pressure pump due to wear only slow pressure drops in the low pressure region occur, so that here a clear distinction is possible. If a leakage is detected by the control device 46, so for example, the further operation of the internal combustion engine can be prevented or a warning to be given to the vehicle driver.

Claims

Ansprüche claims
1. Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine mit einer einen elektrischen Antrieb1. Fuel injection device for an internal combustion engine with an electric drive
(14) aufweisenden Forderpumpe (10), durch die Kraftstoff aus einem Kraftstoffvorratsbehalter (12) in einen Niederdruckbereich zur Saugseite wenigstens einer(14) having Forderpumpe (10), by the fuel from a Kraftstoffvorratsbehalter (12) in a low pressure region to the suction side of at least one
Hochdruckpumpe (20) gefordert wird, wobei durch die Hochdruckpumpe (20) Kraftstoff in einen Hochdruckbereich (42) gefordert wird, in dem wenigstens ein Injektor (44) vorgesehen ist, durch den Kraftstoff an der Brennkraftmaschine eingespritzt wird, und mit einer elektrischen Steuereinrichtung (46) zur Steuerung der Kraftstoffeinspritzung, dadurch gekennzeichnet, dass im Niederdruckbereich ein Drucksensor (56) angeordnet ist, der mit der Steuereinrichtung (46) verbunden ist, und dass durch die Steuereinrichtung (46) der elektrische Antrieb (14) der Forderpumpe (10) zur Einstellung einer in Abhängigkeit wenigstens eines Betriebsparameters der Brennkraftmaschine und/oder der Hochdruckpumpe (20) veränderlichen Fordermenge der Forderpumpe (10) und zur Erzeugung eines vorgegebenen Drucks im Niederdruckbereich angesteuert wird.High pressure pump (20) is required, wherein by the high pressure pump (20) fuel in a high pressure region (42) is required, in which at least one injector (44) is provided, is injected through the fuel to the internal combustion engine, and with an electrical control device ( 46) for controlling the fuel injection, characterized in that in the low-pressure region, a pressure sensor (56) is arranged, which is connected to the control device (46), and that by the control device (46) of the electric drive (14) of the Forderpumpe (10). for setting a variable as a function of at least one operating parameter of the internal combustion engine and / or the high pressure pump (20) Fordermenge the Forderpumpe (10) and is driven to generate a predetermined pressure in the low pressure range.
2. Kraftstoffeinspritzeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der elektrische Antrieb (14) der Forderpumpe (10) durch die Steuereinrichtung (46) zur2. Fuel injection device according to claim 1, characterized in that the electric drive (14) of the Forderpumpe (10) by the control device (46) for
Erzeugung eines veränderlichen Drucks im Niederdruckbereich angesteuert wird.Generation of a variable pressure in the low pressure range is controlled.
3. Kraftstoffeinspritzeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der elektrische Antrieb (14) der3. Fuel injection device according to claim 1, characterized in that the electric drive (14) of the
Forderpumpe (10) durch die Steuereinrichtung (46) zur Einstellung einer veränderlichen Fordermenge der Hochdruckpumpe (20) angesteuert wird.Forderpumpe (10) by the control device (46) for Setting a variable Fordermenge the high pressure pump (20) is driven.
4. Kraftstoffeinspritzeinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass zwischen der4. Fuel injection device according to one of claims 1 to 3, characterized in that between the
Forderpumpe (10) und der Saugseite der Hochdruckpumpe (20) ein Kraftstofffilter (22) vorgesehen ist und dass der Drucksensor (56) zwischen dem Kraftstofffilter (22) und der Saugseite der Hochdruckpumpe (20) angeordnet ist.Forderpumpe (10) and the suction side of the high-pressure pump (20), a fuel filter (22) is provided and that the pressure sensor (56) between the fuel filter (22) and the suction side of the high-pressure pump (20) is arranged.
5. Kraftstoffeinspritzeinrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass zumindest ein Teil des von der Forderpumpe (10) in den Niederdruckbereich geforderten Kraftstoffs durch einen Antriebsbereich (37) der Hochdruckpumpe (20) geleitet wird.5. Fuel injection device according to one of claims 1 to 4, characterized in that at least a portion of the Forderpumpe of the Forderpumpe (10) in the low-pressure region required fuel through a drive region (37) of the high-pressure pump (20) is passed.
6. Kraftstoffeinspritzeinrichtung nach einem der Ansprüche 1, 2, 4 oder 5, dadurch gekennzeichnet, dass zwischen der Forderpumpe (10) und der Saugseite der Hochdruckpumpe (20) eine KraftstoffZumesseinrichtung (50) vorgesehen ist, durch die der Kraftstoffzulauf zur Saugseite der Hochdruckpumpe (20) variiert werden kann.6. Fuel injection device according to one of claims 1, 2, 4 or 5, characterized in that between the Forderpumpe (10) and the suction side of the high-pressure pump (20) KraftstoffZumesseinrichtung (50) is provided, through which the fuel supply to the suction side of the high pressure pump ( 20) can be varied.
7. Kraftstoffeinspritzeinrichtung nach Anspruch 6, dadurch gekennzeichnet, dass durch die elektrische7. Fuel injection device according to claim 6, characterized in that by the electrical
Steuereinrichtung (46) der Antrieb (14) der Forderpumpe (10) derart angesteuert wird, dass bei hoher Last und/oder Drehzahl der Brennkraftmaschine durch die Forderpumpe (10) ein höherer Druck im Niederdruckbereich erzeugt wird als bei geringer Last und/oder Drehzahl.Control device (46) of the drive (14) of the Forderpumpe (10) is driven such that at high load and / or speed of the internal combustion engine by the Forderpumpe (10) a higher pressure in the low pressure region is generated than at low load and / or speed.
8. Kraftstoffeinspritzeinrichtung nach Anspruch 7, dadurch gekennzeichnet, dass durch die elektrische Steuereinrichtung (46) der Antrieb (14) der Forderpumpe (10) derart angesteuert wird, dass mit zunehmender Last und/oder Drehzahl der Brennkraftmaschine durch die Forderpumpe (10) ein zunehmend höherer Druck im Niederdruckbereich erzeugt wird.8. Fuel injection device according to claim 7, characterized in that by the electric control device (46) of the drive (14) of the Forderpumpe (10) is driven such that with increasing load and / or speed of the internal combustion engine through the Forderpumpe (10) an increasingly higher pressure in the low pressure range is generated.
9. Kraftstoffeinspritzeinrichtung nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, dass diese einen Temperatursensor (58) umfasst, durch den die Kraftstofftemperatur erfasst wird und der mit der elektrischen Steuereinrichtung (46) verbunden ist, und dass durch die Steuereinrichtung (46) der Antrieb (14) der Forderpumpe (10) derart angesteuert wird, dass bei hoher9. Fuel injection device according to one of claims 5 to 8, characterized in that it comprises a temperature sensor (58) through which the fuel temperature is detected and which is connected to the electrical control device (46), and that by the control device (46) of the Drive (14) of the Forderpumpe (10) is driven such that at high
Kraftstofftemperatur durch die Forderpumpe (10) ein höherer Druck im Niederdruckbereich erzeugt wird als bei niedriger Kraftstofftemperatur .Fuel temperature by the Forderpumpe (10) is a higher pressure in the low pressure region is generated than at low fuel temperature.
10. Kraftstoffeinspritzeinrichtung nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, dass zwischen der Forderpumpe (10) und der Saugseite der Hochdruckpumpe (20) ein Überströmventil (52) vorgesehen ist, durch das eine Verbindung des Niederdruckbereichs mit einem Entlastungsbereich (53) gesteuert wird.10. Fuel injection device according to one of claims 5 to 9, characterized in that between the Forderpumpe (10) and the suction side of the high-pressure pump (20) an overflow valve (52) is provided, controlled by the connection of the low-pressure region with a discharge region (53) becomes.
11. Kraftstoffeinspritzeinrichtung nach Anspruch 10, dadurch gekennzeichnet, dass das Überströmventil (52) als Druckventil ausgebildet ist, durch das mit zunehmendem Druck im Niederdruckbereich eine zunehmende Kraftstoffmenge aus dem Niederdruckbereich in den Entlastungsbereich (53) abgesteuert wird.11. Fuel injection device according to claim 10, characterized in that the overflow valve (52) is designed as a pressure valve, is controlled by the increasing pressure in the low pressure region, an increasing amount of fuel from the low pressure region in the discharge area (53).
12. Kraftstoffeinspritzeinrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die12. Fuel injection device according to one of the preceding claims, characterized in that the
Verbindung zwischen der Forderpumpe (10) und der Saugseite der Hochdruckpumpe (20) stromaufwärts vor der Saugseite der Hochdruckpumpe (20) durch einen Antriebsbereich (37) der Hochdruckpumpe (20) gefuhrt ist. Connection between the Forderpumpe (10) and the suction side of the high-pressure pump (20) upstream of the suction side of the high pressure pump (20) by a drive portion (37) of the high-pressure pump (20) is guided.
13. Kraftstoffeinspritzeinrichtung nach Anspruch 10 oder 11 und Anspruch 12, dadurch gekennzeichnet, dass das Überströmventil (52) zwischen dem Antriebsbereich (37) und der Saugseite der Hochdruckpumpe (20) angeordnet ist, so dass die gesamte von der Forderpumpe (10) geforderte Kraftstoffmenge durch den Antriebsbereich (37) der Hochdruckpumpe (20) strömt. 13. Fuel injection device according to claim 10 or 11 and claim 12, characterized in that the overflow valve (52) between the drive region (37) and the suction side of the high-pressure pump (20) is arranged, so that the total of the Forderpumpe (10) required amount of fuel through the drive region (37) of the high-pressure pump (20) flows.
EP07728522A 2006-06-14 2007-04-25 Fuel injection device for an internal combustion engine Active EP2032832B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006027486A DE102006027486A1 (en) 2006-06-14 2006-06-14 Fuel injection device for an internal combustion engine
PCT/EP2007/054067 WO2007144227A1 (en) 2006-06-14 2007-04-25 Fuel injection device for an internal combustion engine

Publications (2)

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EP2032832A1 true EP2032832A1 (en) 2009-03-11
EP2032832B1 EP2032832B1 (en) 2010-12-15

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US (1) US8205596B2 (en)
EP (1) EP2032832B1 (en)
JP (1) JP4909406B2 (en)
KR (1) KR101087430B1 (en)
AT (1) ATE491879T1 (en)
DE (2) DE102006027486A1 (en)
WO (1) WO2007144227A1 (en)

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Also Published As

Publication number Publication date
EP2032832B1 (en) 2010-12-15
DE502007005964D1 (en) 2011-01-27
US8205596B2 (en) 2012-06-26
ATE491879T1 (en) 2011-01-15
JP2009540205A (en) 2009-11-19
US20100012096A1 (en) 2010-01-21
JP4909406B2 (en) 2012-04-04
DE102006027486A1 (en) 2007-12-20
KR20090007644A (en) 2009-01-19
KR101087430B1 (en) 2011-11-25
WO2007144227A1 (en) 2007-12-21

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