EP2534363B1 - Method for supplying a high-pressure pump in a fuel injection system of an internal combustion engine with fuel and fuel injection system - Google Patents

Method for supplying a high-pressure pump in a fuel injection system of an internal combustion engine with fuel and fuel injection system Download PDF

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Publication number
EP2534363B1
EP2534363B1 EP11700514.0A EP11700514A EP2534363B1 EP 2534363 B1 EP2534363 B1 EP 2534363B1 EP 11700514 A EP11700514 A EP 11700514A EP 2534363 B1 EP2534363 B1 EP 2534363B1
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EP
European Patent Office
Prior art keywords
pump
fuel
pressure
high pressure
delivery
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.)
Not-in-force
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EP11700514.0A
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German (de)
French (fr)
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EP2534363A1 (en
Inventor
Christian Langenbach
Marcus Kristen
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2534363A1 publication Critical patent/EP2534363A1/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
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/01—Pressure before the pump inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/06—Pressure in a (hydraulic) circuit
    • F04B2205/063—Pressure in a (hydraulic) circuit in a reservoir linked to the pump outlet

Definitions

  • the invention relates to a method for supplying a high-pressure pump in a fuel injection system of an internal combustion engine with fuel, wherein for conveying and for flow control a arranged in a low-pressure circuit electromotive operated pump is used. Furthermore, the invention relates to a fuel injection system, in particular a common rail injection system, an internal combustion engine.
  • a device of the type mentioned above for example, from the EP 1 195 514 A2 which relates to a device for regulating the flow rate of a high pressure pump in a common rail fuel injection system of an internal combustion engine.
  • the specified device comprises an electromotive-operated feed pump which conveys a certain amount of fuel to a high-pressure pump in accordance with a control unit.
  • the delivery pressure is set by a throttle arranged on the suction side of the high-pressure pump, which increases or decreases in proportion to the flow rate.
  • the diameter of the throttle is determined based on determined test results according to the requirements.
  • Such an electric fuel pump allows a demand-driven control, by which the power loss is reduced.
  • overrun operation for example, a reduction of the flow rate to zero is possible to lower the high pressure amount to zero.
  • a corresponding control of the feed pump is not possible if at the same time high-pressure fuel pumps are used, which are dependent on a certain minimum fuel supply, for example, for lubrication and / or cooling.
  • the present invention seeks to provide a method for supplying a high-pressure pump with fuel, which ensures sufficient for lubrication and / or cooling the fuel supply of the high-pressure pump almost independent of the delivered high pressure quantity. Furthermore, a suitable for carrying out the method fuel injection system is to be specified, which is also simple in construction and operable with low power loss.
  • the method proposed for supplying a high-pressure pump with fuel according to the invention is characterized in that the fuel pressure is controlled by means of a arranged on the suction side of the high-pressure pump pressure control valve, wherein in the closed position of the pressure control valve continues to supply the high pressure pump with fuel for lubrication and / or cooling over the Low pressure circuit and the feed pump is ensured. That is, the delivery amount supplied to the high pressure pump for compression can be reduced to zero by closing the pressure control valve and still provide a sufficient amount of fuel for lubrication and / or cooling of the high pressure pump. As a result, in combination with an electric fuel pump as a pump and high pressure pumps can be used, which are dependent on a certain minimum fuel supply.
  • a reduction of the power loss can be achieved by a demand-driven control of the electric motor driven pump.
  • Demand-driven control means that the delivery rate of the feed pump can be reduced to a required amount for lubrication and / or cooling, if, moreover, no fuel should be promoted to high pressure.
  • the advantages already mentioned in relation to the use of an electric fuel pump come into play. If the electric fuel pump used, for example, for volume control, a separate metering unit can be omitted. The number of electrical / electronic components is thus reduced. Furthermore, it can be dispensed with the arrangement of a pressure control valve on the rail or the high-pressure fuel storage. Because the pressure control is now taken over by the invention according to the invention arranged on the suction side of the high-pressure pump pressure control valve. With a reduction in the number of electrical / electronic components is also accompanied by a reduction of the necessary connections or connectors. Consequently, the structure of a suitable for carrying out the method according to the invention fuel injection system is simplified.
  • the closing of the pressure control valve not only allows a reduction of the delivered high pressure amount to zero, while in the low pressure region a sufficient amount of fuel for lubrication and / or cooling remains, but also counteracts the spread of pressure pulsations, especially at occur at high speeds and may possibly lead to undesirable high-pressure flow.
  • the method is therefore particularly suitable in connection with fuel injection systems that use highly dynamic pumps. Such pumps usually also require improved lubrication and / or cooling of their components.
  • the fuel is first supplied to a central pump chamber, from where it is distributed to the two shaft bearing points. Excess fuel is fed via lines to a return line.
  • other components can be lubricated and / or cooled.
  • the pressure regulating valve is designed such that in the closed position of the pressure regulating valve, the lubrication and / or cooling of the high pressure pump is ensured via the opening pressure of the pressure regulating valve. Only when the opening pressure is exceeded is the high-pressure pump supplied with fuel for compression. Below the opening pressure results in no Abêtmenge and thus no high pressure amount, but in the low pressure region remains a residual pressure that can be used for lubrication and / or cooling. In this way, a nearly constant lubrication and / or cooling of the high pressure pump is ensured even at low flow rate of the feed pump. If the speed of the electric fuel pump increases, the delivery rate and thus the pressure increases, so that in the sequence opens the pressure control valve and the high-pressure pump fuel is supplied to the compression.
  • the high pressure amount is therefore defined by the characteristic of the pressure control valve.
  • the characteristic and thus the static and / or dynamic behavior of the pressure control valve is selected according to the requirements.
  • a steep characteristic is chosen to cause a small increase in pressure and at the same time a strong piston damping with an increase in the flow rate.
  • the requirements may also justify a different design of the pressure control valve.
  • measures are provided to compensate for leaks in the area of the pressure regulating valve.
  • Such measures may include, for example, the arrangement of a further pressure control valve on the rail or high-pressure fuel storage, the use of a zero-feed throttle and / or a corresponding control of the injectors.
  • a two-stage pressure control valve is used to improve the lubrication and / or cooling of the high pressure pump.
  • the two-stage design is preferably realized by a connection of the pressure control valve to a return. If a part of the flow rate is supplied via the pressure control valve to the return, at the same time increases the requested flow rate. This in turn leads to increased throughput and thus to improved lubrication and / or cooling. Because with the amount of fuel and the lubricating or cooling performance increases.
  • the connection of the pressure control valve to the return is preferably carried out via a throttle.
  • a throttle connected in parallel with a lubricating and / or cooling line can be used to improve the lubrication and / or cooling.
  • the throughput and, consequently, the lubricating and / or cooling capacity is also increased.
  • the difference to a two-stage design of the pressure regulating valve is that an increase in quantity does not presuppose a specific switching position of the pressure regulating valve, but is constant. The proposed measure is therefore suitable in particular for highly stressed pumps.
  • At least one further throttle can be arranged in a lubricating and / or cooling line for flow limitation.
  • the likewise proposed to solve the problem initially set fuel injection system according to the invention is characterized in that on the suction side of the high-pressure pump, a pressure control valve is provided for controlling the fuel pressure, wherein in the closed position of the pressure control valve for lubricating and / or cooling the high-pressure pump sufficient amount of fuel over the Low pressure circuit and the feed pump is ensured.
  • the pressure control valve in the low pressure circuit is integrated, that even in the closed position of the pressure control valve fuel reaches the components that it is to lubricate and / or cool.
  • the distribution of provided for lubrication and / or cooling amount of fuel via a central pump space.
  • the fuel can for example be supplied to the bearing points of a drive shaft received in the pump housing.
  • separate lubricating and / or cooling lines can be provided for distributing the fuel.
  • the pressure regulating valve is constructed in two stages.
  • the two-stage design can be realized for example by a connection of the pressure control valve to a return, wherein further preferably the connection is via a throttle. By a portion of the flow through the throttle is supplied to the return, the throughput and thus the lubrication and / or cooling capacity can be increased.
  • a throttle may be provided, which is slotted parallel to a lubricating and / or cooling line.
  • a throttle may also be arranged to limit the flow.
  • the specified fuel injection system is suitable for carrying out the method according to the invention described above.
  • the advantages mentioned in connection with the method accordingly apply accordingly to the fuel injection system.
  • a fuel injection device comprises a piston pump designed as a high-pressure pump 1, which is supplied via a low-pressure circuit 2 with fuel.
  • a high pressure pump 1 is shown with a pump piston.
  • the high-pressure pump 1 can also be designed as a multi-piston pump.
  • the piston is or are preferably arranged radially around a drive shaft with a cam or eccentric and supported by a roller and / or a plunger body on the cam or eccentric, so that rotation of the drive shaft causes a stroke movement of the piston or the piston ,
  • the illustrated injection system further comprises an electric motor-driven feed pump 3, which is used in the present case for the delivery of fuel and for controlling the flow rate. A separate metering unit is thus unnecessary.
  • the pressure is controlled by a pressure control valve 5, which is arranged on the suction side of the high-pressure pump 1.
  • the intended for compression fuel passes through the pressure control valve 5 and designed as a check valve inlet valve in a pump working space of the high-pressure pump 1. There, the fuel is compressed by the lifting movement of the piston 10 and fed via a likewise designed as a check valve drain valve to a high-pressure fuel storage 4.
  • the injection of the fuel into the combustion chamber of an internal combustion engine takes place via a plurality of fuel injectors 9 connected to the high-pressure fuel accumulator 4.
  • the illustrated fuel injection system allows the use of a high pressure pump 1, which is dependent on a constant fuel supply, for example, for lubrication and / or cooling of their components. Since such is ensured by the inventive connection of the pressure control valve, the electric motor driven feed pump 3 can be controlled as needed, i. if necessary, the delivered high-pressure quantity can be reduced to zero without the high-pressure pump 1 being damaged.
  • Fig. 2 shows a further embodiment of a fuel injection system according to the invention.
  • the pressure control valve 5 constructed in two stages by a connection of the pressure control valve 5 is provided to the return via a throttle 7. If, in a certain switching position of the pressure control valve 5, at least a partial stream of the delivery quantity is fed to the return via the throttle 7, the quantity requirement and thus the lubricating and / or cooling capacity increases.
  • another throttle 8 can be used, which is connected in parallel.

Description

Die Erfindung betrifft ein Verfahren zur Versorgung einer Hochdruckpumpe in einem Kraftstoffeinspritzsystem einer Brennkraftmaschine mit Kraftstoff, wobei zur Förderung und zur Fördermengenregelung eine in einem Niederdruckkreislauf angeordnete elektromotorisch betriebene Förderpumpe eingesetzt wird. Ferner betrifft die Erfindung ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem, einer Brennkraftmaschine.The invention relates to a method for supplying a high-pressure pump in a fuel injection system of an internal combustion engine with fuel, wherein for conveying and for flow control a arranged in a low-pressure circuit electromotive operated pump is used. Furthermore, the invention relates to a fuel injection system, in particular a common rail injection system, an internal combustion engine.

Stand der TechnikState of the art

Eine Vorrichtung der vorstehend genannten Art geht beispielsweise aus der EP 1 195 514 A2 hervor, die eine Vorrichtung zur Regelung des Durchflusses einer Hochdruckpumpe in einem Common-Rail Kraftstoffeinspritzsystem einer Brennkraftmaschine betrifft. Die angegebene Vorrichtung umfasst hierzu eine elektromotorisch betriebene Förderpumpe, die nach Maßgabe einer Steuereinheit eine bestimmte Menge Kraftstoff zu einer Hochdruckpumpe fördert. In Abhängigkeit von der Fördermenge der Förderpumpe wird durch eine auf der Saugseite der Hochdruckpumpe angeordnete Drossel der Förderdruck vorgegeben, der proportional zur Fördermenge steigt oder fällt. Der Durchmesser der Drossel wird anhand ermittelter Versuchsergebnisse entsprechend den Anforderungen festgelegt.A device of the type mentioned above, for example, from the EP 1 195 514 A2 which relates to a device for regulating the flow rate of a high pressure pump in a common rail fuel injection system of an internal combustion engine. For this purpose, the specified device comprises an electromotive-operated feed pump which conveys a certain amount of fuel to a high-pressure pump in accordance with a control unit. Depending on the delivery rate of the feed pump, the delivery pressure is set by a throttle arranged on the suction side of the high-pressure pump, which increases or decreases in proportion to the flow rate. The diameter of the throttle is determined based on determined test results according to the requirements.

Ein Vorteil des Einsatzes einer elektromotorisch betriebenen Pumpe als Förderpumpe zeigt sich insbesondere darin, dass eine solche Pumpe eine exakte Mengenregelung ermöglicht. Üblicherweise zur Mengenzumessung verwendete Stellglieder, wie beispielsweise eine Zumesseinheit, können demnach entfallen. Dies wiederum hat zur Folge, dass die Anzahl der Bauteile, insbesondere der elektrischen/elektronischen Komponenten, sowie die Anzahl der erforderlichen Anschlüsse und Leitungen reduziert werden kann.An advantage of the use of an electric motor operated pump as a feed pump is particularly evident in that such a pump allows precise flow control. Usually used for Mengenzumessung actuators, such as a metering unit, can therefore be omitted. This in turn has the consequence that the number of components, in particular the electrical / electronic components, as well as the number of required connections and lines can be reduced.

Ferner ermöglicht eine solche Elektrokraftstoffpumpe eine bedarfsgerechte Ansteuerung, durch welche die Verlustleistung verringert wird. Im Schubbetrieb ist beispielsweise eine Reduzierung der Fördermenge auf Null möglich, um auch die Hochdruckmenge auf Null abzusenken. Eine entsprechende Ansteuerung der Förderpumpe ist jedoch nicht möglich, wenn zugleich Kraftstoffhochdruckpumpen Einsatz finden, die auf eine gewisse Mindestkraftstoffversorgung, beispielsweise zur Schmierung und/oder Kühlung, angewiesen sind.Furthermore, such an electric fuel pump allows a demand-driven control, by which the power loss is reduced. In overrun operation, for example, a reduction of the flow rate to zero is possible to lower the high pressure amount to zero. However, a corresponding control of the feed pump is not possible if at the same time high-pressure fuel pumps are used, which are dependent on a certain minimum fuel supply, for example, for lubrication and / or cooling.

Das in der EP 1 195 514 A2 beschriebene Kraftstoffeinspritzsystem weist eine in den Niederdruckkreislauf eingebundene Schmiermittelleitung auf, über welche die Hochdruckpumpe mit Kraftstoff zur Schmierung versorgt wird. Die Versorgung mit Kraftstoff zur Schmierung ist jedoch an eine bestimmte Hochdruck-Fördermenge gebunden, die nicht unterschritten werden darf, da sonst eine konstante Schmierung nicht gewährleistet ist.That in the EP 1 195 514 A2 described fuel injection system has an integrated in the low-pressure circuit lubricant line, via which the high pressure pump is supplied with fuel for lubrication. However, the supply of fuel for lubrication is bound to a certain high-pressure flow rate, which must not be fallen below, otherwise a constant lubrication is not guaranteed.

Weitere Kraftstoffeinspritzsysteme, welche Schmierleitungen aufweisen sind in der EP 1 574 704 A2 und der DE 10 2007 006 945 A1 gezeigt.Other fuel injection systems, which have lubrication lines are in the EP 1 574 704 A2 and the DE 10 2007 006 945 A1 shown.

Ausgehend von dem vorstehend genannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Versorgung einer Hochdruckpumpe mit Kraftstoff bereit zu stellen, durch welches eine zur Schmierung und/oder Kühlung ausreichende Kraftstoffversorgung der Hochdruckpumpe nahezu unabhängig von der geförderten Hochdruckmenge sichergestellt ist. Ferner soll ein zur Durchführung des Verfahrens geeignetes Kraftstoffeinspritzsystem angegeben werden, das zudem einfach aufgebaut und mit geringer Verlustleistung betreibbar ist.Based on the above-mentioned prior art, the present invention seeks to provide a method for supplying a high-pressure pump with fuel, which ensures sufficient for lubrication and / or cooling the fuel supply of the high-pressure pump almost independent of the delivered high pressure quantity. Furthermore, a suitable for carrying out the method fuel injection system is to be specified, which is also simple in construction and operable with low power loss.

Zur Lösung der Aufgabe wird ein Verfahren mit den Merkmalen des Anspruchs 1 sowie ein Kraftstoffeinspritzsystem mit den Merkmalen des Anspruchs 8 vorgeschlagen. Vorteilhafte Weiterbildungen der jeweiligen Erfindung werden in den Unteransprüchen angegeben.To solve the problem, a method having the features of claim 1 and a fuel injection system with the features of claim 8 is proposed. Advantageous developments of the respective invention are specified in the subclaims.

Offenbarung der ErfindungDisclosure of the invention

Das zur Versorgung einer Hochdruckpumpe mit Kraftstoff vorgeschlagene Verfahren zeichnet sich erfindungsgemäß dadurch aus, dass der Kraftstoffdruck mittels eines auf der Saugseite der Hochdruckpumpe angeordneten Druckregelventils geregelt wird, wobei in Schließstellung des Druckregelventils weiterhin eine Versorgung der Hochdruckpumpe mit Kraftstoff zur Schmierung und/oder Kühlung über den Niederdruckkreislauf und die Förderpumpe sichergestellt wird. Das heißt, dass die der Hochdruckpumpe zur Verdichtung zugeführte Fördermenge durch Schließen des Druckregelventils auf Null reduziert werden kann und dennoch eine ausreichende Menge Kraftstfoff zur Schmierung und/oder Kühlung der Hochdruckpumpe bereit gestellt wird. Dadurch sind in Kombination mit einer Elektrokraftstoffpumpe als Förderpumpe auch Hochdruckpumpen einsetzbar, die auf eine gewisse Mindestkraftstoffversorgung angewiesen sind. Zugleich kann durch eine bedarfsgerechte Ansteuerung der elektromotorisch betriebenen Förderpumpe eine Reduzierung der Verlustleistung erzielt werden. Bedarfsgerechte Ansteuerung bedeutet, dass die Fördermenge der Förderpumpe auf eine zur Schmierung und/oder Kühlung erforderliche Menge reduziert werden kann, wenn darüber hinaus kein Kraftstoff auf Hochdruck gefördert werden soll.The method proposed for supplying a high-pressure pump with fuel according to the invention is characterized in that the fuel pressure is controlled by means of a arranged on the suction side of the high-pressure pump pressure control valve, wherein in the closed position of the pressure control valve continues to supply the high pressure pump with fuel for lubrication and / or cooling over the Low pressure circuit and the feed pump is ensured. That is, the delivery amount supplied to the high pressure pump for compression can be reduced to zero by closing the pressure control valve and still provide a sufficient amount of fuel for lubrication and / or cooling of the high pressure pump. As a result, in combination with an electric fuel pump as a pump and high pressure pumps can be used, which are dependent on a certain minimum fuel supply. At the same time a reduction of the power loss can be achieved by a demand-driven control of the electric motor driven pump. Demand-driven control means that the delivery rate of the feed pump can be reduced to a required amount for lubrication and / or cooling, if, moreover, no fuel should be promoted to high pressure.

Darüber hinaus kommen die bereits eingangs genannten Vorteile in Bezug auf den Einsatz einer Elektrokraftstoffpumpe zum Tragen. Wird die Elektrokraftstoffpumpe beispielsweise zur Mengenregelung genutzt, kann eine separate Zumesseinheit entfallen. Die Anzahl der elektrischen/elektronischen Bauteile wird somit reduziert. Des Weiteren kann auf die Anordnung eines Druckregelventils am Rail bzw. am Kraftstoffhochdruckspeicher verzichtet werden. Denn die Druckregelung wird nunmehr von dem erfindungsgemäß auf der Saugseite der Hochdruckpumpe angeordneten Druckregelventil übernommen. Mit einer Reduzierung der Anzahl der elektrischen/elektronischen Bauteile geht ferner eine Reduzierung der notwendigen Anschlüsse bzw. Steckverbindungen einher. Folglich wird auch der Aufbau eines zur Durchführung des erfindungsgemäßen Verfahrens geeigneten Kraftstoffeinspritzsystems vereinfacht.In addition, the advantages already mentioned in relation to the use of an electric fuel pump come into play. If the electric fuel pump used, for example, for volume control, a separate metering unit can be omitted. The number of electrical / electronic components is thus reduced. Furthermore, it can be dispensed with the arrangement of a pressure control valve on the rail or the high-pressure fuel storage. Because the pressure control is now taken over by the invention according to the invention arranged on the suction side of the high-pressure pump pressure control valve. With a reduction in the number of electrical / electronic components is also accompanied by a reduction of the necessary connections or connectors. Consequently, the structure of a suitable for carrying out the method according to the invention fuel injection system is simplified.

Das Schließen des Druckregelventils ermöglicht nicht nur eine Reduzierung der geförderten Hochdruckmenge auf Null, während im Niederdruckbereich eine ausreichende Menge Kraftstoff zur Schmierung und/oder Kühlung verbleibt, sondern wirkt auch der Ausbreitung von Druckpulsationen entgegen, die insbesondere bei hohen Drehzahlen auftreten und die unter Umständen zu unerwünschter Hochdruckfördermenge führen können. Das Verfahren eignet sich daher vor allem in Verbindung mit Kraftstoffeinspritzsystemen, die hochdynamische Pumpen einsetzen. Derartige Pumpen erfordern in der Regel auch eine verbesserte Schmierung und/oder Kühlung ihrer Bauteile.The closing of the pressure control valve not only allows a reduction of the delivered high pressure amount to zero, while in the low pressure region a sufficient amount of fuel for lubrication and / or cooling remains, but also counteracts the spread of pressure pulsations, especially at occur at high speeds and may possibly lead to undesirable high-pressure flow. The method is therefore particularly suitable in connection with fuel injection systems that use highly dynamic pumps. Such pumps usually also require improved lubrication and / or cooling of their components.

In der Regel ist eine Schmierung und/oder Kühlung vor allem der im Gehäuse der Hochdruckpumpe ausgebildeten Lagerstellen zur Aufnahme der Antriebswelle sicherzustellen. Gemäß dem vorgeschlagenen Verfahren wird hierzu der Kraftstoff zunächst einem zentralen Pumpenraum zugeführt, von wo aus er sich auf die beiden Wellenlagerstellen verteilt. Überschüssiger Kraftstoff wird über Leitungen einem Rücklauf zugeführt. Darüber hinaus können auch weitere Komponenten geschmiert und/oder gekühlt werden.As a rule, lubrication and / or cooling is to be ensured above all of the bearing points formed in the housing of the high-pressure pump for receiving the drive shaft. According to the proposed method, for this purpose, the fuel is first supplied to a central pump chamber, from where it is distributed to the two shaft bearing points. Excess fuel is fed via lines to a return line. In addition, other components can be lubricated and / or cooled.

Dabei ist das Druckregelventil derart ausgelegt, dass in Schließstellung des Druckregelventils die Schmierung und/oder Kühlung der Hochdruckpumpe über den Öffnungsdruck des Druckregelventils sichergestellt wird. Erst bei Überschreitung des Öffnungsdrucks wird der Hochdruckpumpe Kraftstoff zur Verdichtung zugeführt. Unterhalb des Öffnungsdrucks ergibt sich keine Absteuermenge und somit keine Hochdruckmenge, wobei jedoch im Niederdruckbereich ein Restdruck verbleibt, der zur Schmierung und/oder Kühlung verwendet werden kann. Auf diese Weise ist auch bei geringer Fördermenge der Förderpumpe eine nahezu konstante Schmierung und/oder Kühlung der Hochdruckpumpe gewährleistet. Wird die Drehzahl der Elektrokraftstoffpumpe erhöht, steigt die Fördermenge und damit der Druck, so dass in der Folge das Druckregelventil öffnet und der Hochdruckpumpe Kraftstoff zur Verdichtung zugeführt wird.In this case, the pressure regulating valve is designed such that in the closed position of the pressure regulating valve, the lubrication and / or cooling of the high pressure pump is ensured via the opening pressure of the pressure regulating valve. Only when the opening pressure is exceeded is the high-pressure pump supplied with fuel for compression. Below the opening pressure results in no Absteuermenge and thus no high pressure amount, but in the low pressure region remains a residual pressure that can be used for lubrication and / or cooling. In this way, a nearly constant lubrication and / or cooling of the high pressure pump is ensured even at low flow rate of the feed pump. If the speed of the electric fuel pump increases, the delivery rate and thus the pressure increases, so that in the sequence opens the pressure control valve and the high-pressure pump fuel is supplied to the compression.

Die Hochdruckmenge wird demnach über die Kennlinie des Druckregelventils definiert. Die Kennlinie und damit das statische und/oder dynamische Verhalten des Druckregelventils wird entsprechend den Anforderungen gewählt. Vorzugsweise wird eine steile Kennlinie gewählt, um bei einer Zunahme der Fördermenge einen geringen Druckanstieg und gleichzeitig eine starke Kolbendämpfung zu bewirken. Die Anforderungen können darüber hinaus aber auch eine andere Auslegung des Druckregelventils rechtfertigen.The high pressure amount is therefore defined by the characteristic of the pressure control valve. The characteristic and thus the static and / or dynamic behavior of the pressure control valve is selected according to the requirements. Preferably, a steep characteristic is chosen to cause a small increase in pressure and at the same time a strong piston damping with an increase in the flow rate. However, the requirements may also justify a different design of the pressure control valve.

Weiterhin bevozugt sind Maßnahmen zur Kompensierung von Leckagen im Bereich des Druckregelventils vorgesehen. Derartige Maßnahmen können zum Beispiel die Anordnung eines weiteren Druckregelventils am Rail bzw. Kraftstoffhochdruckspeicher, die Verwendung einer Nullförderdrossel und/oder eine entsprechende Ansteuerung der Injektoren umfassen.Furthermore, measures are provided to compensate for leaks in the area of the pressure regulating valve. Such measures may include, for example, the arrangement of a further pressure control valve on the rail or high-pressure fuel storage, the use of a zero-feed throttle and / or a corresponding control of the injectors.

Gemäß einer bervorzugten Ausführungsform der Erfindung wird zur Verbesserung der Schmierung und/oder Kühlung der Hochdruckpumpe ein zweistufiges Druckregelventil eingesetzt. Die zweistufige Ausführung wird vorzugsweise durch eine Anbindung des Druckregelventils an einen Rücklauf realisiert. Wird ein Teil der Fördermenge über das Druckregelventil dem Rücklauf zugeführt, steigt zugleich die angefragte Fördermenge. Dies wiederum führt zu einem erhöhten Durchsatz und damit zu einer verbesserten Schmierung und/oder Kühlung. Denn mit der Kraftstoffmenge steigt auch die Schmier- bzw. Kühlleistung. Die Anbindung des Druckregelventils an den Rücklauf erfolgt dabei vorzugsweise über eine Drossel.According to a vorber preferred embodiment of the invention, a two-stage pressure control valve is used to improve the lubrication and / or cooling of the high pressure pump. The two-stage design is preferably realized by a connection of the pressure control valve to a return. If a part of the flow rate is supplied via the pressure control valve to the return, at the same time increases the requested flow rate. This in turn leads to increased throughput and thus to improved lubrication and / or cooling. Because with the amount of fuel and the lubricating or cooling performance increases. The connection of the pressure control valve to the return is preferably carried out via a throttle.

Alternativ oder ergänzend kann zur Verbesserung der Schmierung und/oder Kühlung eine parallel zu einer Schmier- und/oder Kühlleitung geschaltete Drossel eingesetzt werden. Durch diese Maßnahme wird ebenfalls der Durchsatz und damit einhergehend die Schmier- und/oder Kühlleistung gesteigert. Der Unterschied zu einer zweistufigen Ausbildung des Druckregelventils besteht darin, dass eine Mengensteigerung keine bestimmte Schaltstellung des Druckregelventils voraussetzt, sondern konstant gegeben ist. Die vorgeschlagene Maßnahme eignet sich demzufolge insbesondere für hochbeanspruchte Pumpen.Alternatively or additionally, a throttle connected in parallel with a lubricating and / or cooling line can be used to improve the lubrication and / or cooling. By this measure, the throughput and, consequently, the lubricating and / or cooling capacity is also increased. The difference to a two-stage design of the pressure regulating valve is that an increase in quantity does not presuppose a specific switching position of the pressure regulating valve, but is constant. The proposed measure is therefore suitable in particular for highly stressed pumps.

Ferner kann wenigstens eine weitere Drossel in einer Schmier- und/oder Kühlleitung zur Durchflussbegrenzung angeordnet sein.Furthermore, at least one further throttle can be arranged in a lubricating and / or cooling line for flow limitation.

Das ebenfalls zur Lösung der eingangs gestellten Aufgabe vorgeschlagene Kraftstoffeinspritzsystem zeichnet sich erfindungsgemäß dadurch aus, dass auf der Saugseite der Hochdruckpumpe ein Druckregelventil zur Regelung des Kraftstoffdrucks vorgesehen ist, wobei in Schließstellung des Druckregelventils eine zur Schmierung und/oder Kühlung der Hochdruckpumpe ausreichende Menge Kraftstoff über den Niederdruckkreislauf und die Förderpumpe sichergestellt ist. Dies setzt voraus, dass das Druckregelventil derart in den Niederdruckkreislauf integriert ist, dass auch in Schließstellung des Druckregelventils Kraftstoff zu den Bauteilen gelangt, die es zu schmieren und/oder zu kühlen gilt. Vorzugsweise erfolgt die Verteilung der zur Schmierung und/oder Kühlung vorgesehenen Kraftstoffmenge über einen zentralen Pumpenraum. Von hier aus kann der Kraftstoff beispielsweise den Lagerstellen einer im Pumpengehäuse aufgenommenen Antriebswelle zugeführt werden. Alternativ oder ergänzend können auch separate Schmier- und/oder Kühlleitungen zur Verteilung des Kraftstoffs vorgesehen sein.The likewise proposed to solve the problem initially set fuel injection system according to the invention is characterized in that on the suction side of the high-pressure pump, a pressure control valve is provided for controlling the fuel pressure, wherein in the closed position of the pressure control valve for lubricating and / or cooling the high-pressure pump sufficient amount of fuel over the Low pressure circuit and the feed pump is ensured. This assumes that the pressure control valve in the low pressure circuit is integrated, that even in the closed position of the pressure control valve fuel reaches the components that it is to lubricate and / or cool. Preferably, the distribution of provided for lubrication and / or cooling amount of fuel via a central pump space. From here, the fuel can for example be supplied to the bearing points of a drive shaft received in the pump housing. Alternatively or additionally, separate lubricating and / or cooling lines can be provided for distributing the fuel.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist das Druckregelventil zweistufig aufgebaut. Die zweistufige Ausführung kann beispielsweise durch eine Anbindung des Druckregelventils an einen Rücklauf realisiert werden, wobei weiterhin vorzugsweise die Anbindung über eine Drossel erfolgt. Indem ein Teil der Fördermenge über die Drossel dem Rücklauf zugeführt wird, kann der Durchsatz und damit die Schmier- und/oder Kühlleistung gesteigert werden.According to a preferred embodiment of the invention, the pressure regulating valve is constructed in two stages. The two-stage design can be realized for example by a connection of the pressure control valve to a return, wherein further preferably the connection is via a throttle. By a portion of the flow through the throttle is supplied to the return, the throughput and thus the lubrication and / or cooling capacity can be increased.

Alternativ oder ergänzend kann eine Drossel vorgesehen sein, die parallel zu einer Schmier- und/oder Kühlleitung geschlatet ist. In einer Schmier- und/oder Kühlleitung kann zudem eine Drossel zur Durchflussbegrenzung angeordnet sein. Diese Maßnahmen bewirken ebenfalls eine Verbesserung bzw. Steigerung der Schmier- und/oder Kühlleistung.Alternatively or additionally, a throttle may be provided, which is slotted parallel to a lubricating and / or cooling line. In a lubrication and / or cooling line, a throttle may also be arranged to limit the flow. These measures also cause an improvement or increase the lubrication and / or cooling capacity.

Ferner bevorzugt ist das angegebene Kraftstoffeinspritzsystem zur Durchführung des vorstehend beschriebenen erfindungsgemäßen Verfahrens geeignet. Die im Zusammenhang mit dem Verfahren erwähnten Vorteile gelten demnach entsprechend für das Kraftstoffeinspritzsystem.Further preferably, the specified fuel injection system is suitable for carrying out the method according to the invention described above. The advantages mentioned in connection with the method accordingly apply accordingly to the fuel injection system.

Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beiden Zeichnungen näher erläutert. Diese zeigen:

Fig. 1
eine schematische Darstellung eines Kraftstoffeinspritzsystems gemäß einer ersten erfindungsgemäßen Ausführungsform und
Fig. 2
eine schematische Darstellung eines Kraftstoffeinspritzsystems gemäß einer zweiten erfindungsgemäßen Ausführungsform.
Preferred embodiments of the invention are explained below with reference to the two drawings. These show:
Fig. 1
a schematic representation of a fuel injection system according to a first embodiment of the invention and
Fig. 2
a schematic representation of a fuel injection system according to a second embodiment of the invention.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Die in Fig. 1 schematisch dargestellte erste Ausführungsform einer erfindungsgemäßen Kraftstoffeinspritzvorrichtung umfasst eine als Kolbenpumpe ausgebildete Hochdruckpumpe 1, welche über einen Niederdruckkreislauf 2 mit Kraftstoff versorgt wird. Beispielhaft ist eine Hochdruckpumpe 1 mit einem Pumpenkolben dargestellt. Alternativ kann die Hochdruckpumpe 1 aber auch als Mehrkolbenpumpe ausgebildet sein. Der bzw. die Kolben ist bzw. sind vorzugsweise radial um eine Antriebswelle mit einem Nocken oder Exzenter angeordnet und über eine Rolle und/oder einen Stößelkörper am Nocken oder Exzenter abgestützt, so dass eine Drehung der Antriebswelle eine Hubbewegung des Kolbens bzw. der Kolben bewirkt.In the Fig. 1 schematically illustrated first embodiment of a fuel injection device according to the invention comprises a piston pump designed as a high-pressure pump 1, which is supplied via a low-pressure circuit 2 with fuel. By way of example, a high pressure pump 1 is shown with a pump piston. Alternatively, however, the high-pressure pump 1 can also be designed as a multi-piston pump. The piston is or are preferably arranged radially around a drive shaft with a cam or eccentric and supported by a roller and / or a plunger body on the cam or eccentric, so that rotation of the drive shaft causes a stroke movement of the piston or the piston ,

Das dargestellte Einspritzsystem umfasst ferner eine elektromotorisch betriebene Förderpumpe 3, die vorliegend zur Förderung von Kraftstoff und zur Regelung der Fördermenge eingesetzt wird. Eine separate Zumesseinheit ist somit entbehrlich. Die Druckregelung erfolgt über ein Druckregelventil 5, das auf der Saugseite der Hochdruckpumpe 1 angeordnet ist. Der zur Verdichtung vorgesehene Kraftstoff gelangt über das Druckregelventil 5 und ein als Rückschlagventil ausgebildetes Zulaufventil in einen Pumpenarbeitsraum der Hochdruckpumpe 1. Dort wird der Kraftstoff durch die Hubbewegung des Kolbens 10 verdichtet und über ein ebenfalls als Rückschlagventil ausgebildetes Ablaufventil einem Kraftstoffhochdruckspeicher 4 zugeführt. Die Einspritzung des Kraftstoffs in den Brennraum einer Brennkraftmaschine erfolgt über mehrere an den Kraftstoffhochdruckspeicher 4 angeschlossene Kraftstoffinjektoren 9.The illustrated injection system further comprises an electric motor-driven feed pump 3, which is used in the present case for the delivery of fuel and for controlling the flow rate. A separate metering unit is thus unnecessary. The pressure is controlled by a pressure control valve 5, which is arranged on the suction side of the high-pressure pump 1. The intended for compression fuel passes through the pressure control valve 5 and designed as a check valve inlet valve in a pump working space of the high-pressure pump 1. There, the fuel is compressed by the lifting movement of the piston 10 and fed via a likewise designed as a check valve drain valve to a high-pressure fuel storage 4. The injection of the fuel into the combustion chamber of an internal combustion engine takes place via a plurality of fuel injectors 9 connected to the high-pressure fuel accumulator 4.

In Schließstellung des Druckregelventils 5 wird dem Pumpenarbeitsraum der Hochdruckpumpe 1 kein Kraftstoff zur Verdichtung zugeführt. Dennoch ist über den Niederdruckkreislauf 2 und die elektromotorisch betriebene Förderpumpe 3 eine ausreichende Schmierung und/oder Kühlung der Hochdruckpumpe 1 sichergestellt. Denn auch in Schließstellung des Druckregelventils 5 gelangt weiterhin Kraftstoff in einen zentralen Pumpenraum , in welchem die Antriebswelle aufgenommen ist, so dass über den Pumpenraum die im Gehäuse der Hochdruckpumpe 1 ausgebildeten Lagerstellen 6 der Antriebswelle mit ausreichend Kraftstoff zur Schmierung und/oder Kühlung versorgt werden. Vorliegend sind hierzu Schmier- und/oder Kühlleitungen im Gehäuse der Hochdruckpumpe 1 angeordnet, die zudem mit einem Rücklauf verbunden sind, um überschüssigen Kraftstoff abzuführen.In the closed position of the pressure control valve 5 the pump working space of the high-pressure pump 1, no fuel is supplied for compression. Nevertheless, sufficient lubrication and / or cooling of the high-pressure pump 1 is ensured via the low-pressure circuit 2 and the electromotive-operated feed pump 3. For even in the closed position of the pressure control valve 5 continues to fuel in a central pump chamber, in which the drive shaft is received, so that over the pump chamber formed in the housing of the high-pressure pump 1 bearings 6 of the drive shaft are supplied with sufficient fuel for lubrication and / or cooling. In the present case, lubrication and / or cooling lines in the housing of the high-pressure pump 1 are provided for this purpose arranged, which are also connected to a return to dissipate excess fuel.

Das dargestellte erfindungsgemäße Kraftstoffeinspritzsystem ermöglicht den Einsatz einer Hochdruckpumpe 1, die auf eine konstante Kraftstoffversorgung, beispielsweise zur Schmierung und/oder Kühlung ihrer Bauteile, angewiesen ist. Da eine solche durch die erfindungsgemäße Anbindung des Druckregelventils gewährleistet ist, kann die elektromotorisch betriebene Förderpumpe 3 bedarfsgerecht angesteuert, d.h. die geförderte Hochdruckmenge ggf. auf Null reduziert werden, ohne dass die Hochdruckpumpe 1 Schaden nimmt.The illustrated fuel injection system according to the invention allows the use of a high pressure pump 1, which is dependent on a constant fuel supply, for example, for lubrication and / or cooling of their components. Since such is ensured by the inventive connection of the pressure control valve, the electric motor driven feed pump 3 can be controlled as needed, i. if necessary, the delivered high-pressure quantity can be reduced to zero without the high-pressure pump 1 being damaged.

Fig. 2 zeigt eine weitere Ausführungsform eines erfindungsgemäßen Kraftstoffeinspritzsystems. Im Unterschied zur Ausführungsform der Fig. 1 ist hier das Druckregelventil 5 zweistufig aufgebaut, indem eine Anbindung des Druckregelventils 5 an den Rücklauf über eine Drossel 7 vorgesehen ist. Wird in einer bestimmten Schaltstellung des Druckregelventils 5 zumindest ein Teilstrom der Fördermenge über die Drossel 7 dem Rücklauf zugeführt, steigt die Mengenanforderung und damit die Schmier- und/oder Kühlleistung. Um die Kraftstoffmenge und damit einhergehend die Schmier- und/oder Kühlleistung unabhängig von der jeweiligen Schaltstellung des Druckregelventils 5 zu steigern, kann - wie vorliegend dargestellt - alternativ oder ergänzend eine weitere Drossel 8 eingesetzt werden, die parallel geschaltet ist. Fig. 2 shows a further embodiment of a fuel injection system according to the invention. In contrast to the embodiment of Fig. 1 here is the pressure control valve 5 constructed in two stages by a connection of the pressure control valve 5 is provided to the return via a throttle 7. If, in a certain switching position of the pressure control valve 5, at least a partial stream of the delivery quantity is fed to the return via the throttle 7, the quantity requirement and thus the lubricating and / or cooling capacity increases. In order to increase the amount of fuel and concomitantly the lubricating and / or cooling capacity regardless of the respective switching position of the pressure control valve 5, as shown here - alternatively or additionally, another throttle 8 can be used, which is connected in parallel.

Claims (10)

  1. Method for supplying fuel to a high pressure pump (1) in a fuel injection system of an internal combustion engine, wherein the high pressure pump has a central pump chamber in which a drive shaft is accommodated, wherein for delivery a delivery pump (3) is used which is arranged in a low pressure circuit (2) and by means of which, depending on the motor rotation speed selected, a specific quantity of fuel passes into the central pump chamber and subsequently is supplied to a pump working chamber of the high pressure pump (1), in which chamber the fuel is first compressed and then supplied to a high pressure fuel accumulator (4), characterized in that, for the delivery quantity control, use is made of an electric-motor-driven delivery pump (3) without a separate metering unit, and the fuel pressure on the suction side of the high-pressure pump (1) is regulated, by way of a pressure regulation valve which is arranged in a line downstream of the central pump chamber and upstream of the pump working chamber and which is controlled by way of the delivery quantity of the delivery pump (3), in order to reduce the number of electrical or electronic components, wherein with the pressure regulation valve (5) in the closed position, below the opening pressure, a supply of fuel to the high pressure pump (1) is still ensured for lubrication and/or cooling via the low pressure circuit (2) and the delivery pump (3).
  2. Method according to Claim 1, characterized in that the high pressure pump (1) is supplied with fuel for compression only when the opening pressure is exceeded.
  3. Method according to Claim 1 or 2, characterized in that the high pressure quantity is defined via the characteristic curve of the pressure regulation valve (5).
  4. Method according to any of the preceding claims, characterized in that leakages in the region of the pressure regulation valve (5) are compensated by arranging a further pressure regulation valve on the high pressure fuel accumulator (4), by use of a zero delivery choke and/or by corresponding control of the injectors.
  5. Method according to any of the preceding claims, characterized in that, to improve the lubrication and/or cooling of the high pressure pump (1), a two-stage pressure regulation valve (5) is used.
  6. Method according to any of the preceding claims, characterized in that, to improve the lubrication and/or cooling of the high pressure pump (1), a choke (6) is used which is connected in parallel to a lubrication and/or cooling line (7).
  7. Method according to any of the preceding claims, characterized in that, for flow restriction, a choke (6) is used which is arranged in a lubrication and/or cooling line (7).
  8. Fuel injection system of an internal combustion engine, in particular a common rail injection system, with a high pressure pump (1) which delivers fuel at high pressure and supplies it to a high pressure fuel accumulator (4), wherein the high pressure pump has a central pump chamber in which a drive shaft is accommodated, and with a delivery pump (3) arranged in a low pressure circuit (2) to supply fuel to the high pressure pump (1), wherein the delivery quantity can be regulated via the delivery pump (3) and the fuel passes, via decentralized pump chamber, into a pump working chamber where the fuel is compressed, characterized in that, for the delivery quantity regulation, use is made of an electric-motor-driven delivery pump (3) without a separate metering unit, and a pressure regulation valve (5) which is controlled by way of the delivery quantity of the delivery pump (3) is arranged in a line downstream of the central pump chamber and upstream of the pump working chamber, which pressure regulation valve is provided for regulating the fuel pressure on the suction side of the high-pressure pump, in order to reduce the number of electrical or electronic components, wherein when the pressure regulation valve (5) is in the closed position, below the opening pressure, a sufficient quantity of fuel for lubrication and/or cooling of the high pressure pump (1) is ensured via the low pressure circuit (2) and the delivery pump (3).
  9. Fuel injection system according to Claim 8, characterized in that the pressure regulation valve (5) is constructed in two stages.
  10. Fuel injection system according to Claim 8 or 9, characterized in that at least one choke (6) is arranged in a lubrication and/or cooling line (7) and/or connected in parallel thereto.
EP11700514.0A 2010-02-11 2011-01-03 Method for supplying a high-pressure pump in a fuel injection system of an internal combustion engine with fuel and fuel injection system Not-in-force EP2534363B1 (en)

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DE102010001834A DE102010001834A1 (en) 2010-02-11 2010-02-11 Method for supplying a high-pressure pump in a fuel injection system of an internal combustion engine with fuel and fuel injection system
PCT/EP2011/050017 WO2011098305A1 (en) 2010-02-11 2011-01-03 Method for supplying a high-pressure pump in a fuel injection system of an internal combustion engine with fuel and fuel injection system

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EP2534363B1 true EP2534363B1 (en) 2016-08-10

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DE102005027851A1 (en) * 2005-06-16 2006-12-21 Robert Bosch Gmbh Fuel injection system for an internal combustion engine
DE602006017981D1 (en) * 2006-06-09 2010-12-16 Fiat Ricerche Fuel injection device for an internal combustion engine
DE602006014172D1 (en) * 2006-11-16 2010-06-17 Fiat Ricerche Improved fuel injection system for an internal combustion engine
DE102007006945A1 (en) * 2007-02-13 2008-08-14 Robert Bosch Gmbh Fuel discharge valve for use in internal-combustion engine, has valve unit, and compensating piston movably arranged in housing and acted upon by pressures predominant in low pressure area and discharging area
DE602007004729D1 (en) * 2007-09-11 2010-03-25 Fiat Ricerche Fuel injection device with a variable flow rate high pressure fuel pump
DE102009028115A1 (en) * 2009-07-30 2011-02-03 Robert Bosch Gmbh Fuel injection system and method for operating a fuel injection system

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US9004044B2 (en) 2015-04-14
WO2011098305A1 (en) 2011-08-18
US20130025569A1 (en) 2013-01-31
EP2534363A1 (en) 2012-12-19
CN102753810B (en) 2016-06-08
DE102010001834A1 (en) 2011-08-11
CN102753810A (en) 2012-10-24

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