EP2450553A2 - Fuel injection system of a combustion engine and method for controlling same - Google Patents

Fuel injection system of a combustion engine and method for controlling same Download PDF

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Publication number
EP2450553A2
EP2450553A2 EP11182137A EP11182137A EP2450553A2 EP 2450553 A2 EP2450553 A2 EP 2450553A2 EP 11182137 A EP11182137 A EP 11182137A EP 11182137 A EP11182137 A EP 11182137A EP 2450553 A2 EP2450553 A2 EP 2450553A2
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EP
European Patent Office
Prior art keywords
pressure
low
pump
fuel
injection system
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
EP11182137A
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German (de)
French (fr)
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EP2450553A3 (en
EP2450553B1 (en
Inventor
Helmar Gruhl
Paulo Jorge Ferreira Goncalves
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2450553A3 publication Critical patent/EP2450553A3/en
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Classifications

    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02D41/3082—Control of electrical fuel pumps
    • 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
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/023—Means for varying pressure in common rails
    • F02M63/0235—Means for varying pressure in common rails by bleeding fuel pressure
    • F02M63/025—Means for varying pressure in common rails by bleeding fuel pressure from the common rail

Definitions

  • the invention relates to a method for controlling a low-pressure and high-pressure fuel injection system of an internal combustion engine, wherein a high-pressure fuel pump, a low pressure amount is supplied from the low pressure region, which compresses this low pressure to high pressure and promotes pressure in an accumulator of the high pressure region, and wherein the low pressure of the high pressure fuel pump is metered in accordance with a to be reached in an operating point of the internal combustion engine injection pressure.
  • the invention further relates to the structure of such a fuel injection system.
  • Fuel injection systems of modern diesel engines are predominantly designed today as common-rail injection systems.
  • high pressure fuel is withdrawn through the individual fuel injectors of the cylinders from a pressure accumulator, which is supplied via a high pressure fuel pump with the appropriate amount of fuel.
  • the fuel injection system in this case has a low-pressure region, from which the required amount of fuel is metered into the high-pressure fuel pump.
  • the metered addition to the high-pressure fuel pump is usually carried out via an upstream metering unit or a variable-volume feed pump.
  • a quantity-controllable delivery pump For metering the low pressure quantity to the high-pressure fuel pump, this is preceded by a quantity-controllable delivery pump, which adjusts the low-pressure quantity in accordance with an injection pressure to be achieved in the pressure accumulator of the high-pressure region.
  • a valve is provided between the flow-adjustable feed pump and the high-pressure fuel pump, which allows the promotion to high-pressure fuel pump from reaching a certain feed pressure in the feed line.
  • the feed pump is followed by a pressure control valve to regulate the pressure in the low pressure range. About this pressure control valve fuel is returned from exceeding a predetermined pressure in a reservoir.
  • the present invention seeks to provide a method for controlling a fuel injection system available, which allows the most efficient and flexible control of a fuel injection system of an internal combustion engine. Furthermore, it is an object of the present invention to provide a fuel injection system of an internal combustion engine, in which an efficient control is possible. Finally, such a fuel injection system should be feasible with the least possible manufacturing effort.
  • the invention comprises the technical teaching that an adjustment of the high-pressure fuel pump metered low-pressure quantity is carried out by controlling a flow rate of a feed pump and a throttle amount of a metering unit.
  • the volume adjustable feed pump is followed by a metering unit, which together with the feed pump adjusts the high pressure fuel pump supplied low pressure.
  • Such a structure and such a method have the advantage that an efficient control of the metered low-pressure quantity in the manner of a multi-variable control in dependence on the injection pressure to be achieved can be realized. Because of the interaction of the volume-adjustable feed pump and a throttling via the downstream metering unit, a fast and precise adjustment of the low-pressure quantity to be metered can take place.
  • the fuel injection system as well as the method of controlling the same is the DE 19735561 A1 more complex.
  • metered addition is effected by means of a flow controlled delivery pump, in order to be able to realize a suitable addition to the high-pressure fuel pump, however, regulation of the low-pressure region via the pressure regulating valve which is detached from the high-pressure region is necessary. As a result, the control and the structure of the fuel injection system make more complicated.
  • a setting of the low pressure amount is initially made predominantly via a change in the throttle amount of the metering unit, with increasing change in the delivery rate of the feed pump, the throttle amount is back regulated accordingly.
  • the throttle amount of the metering unit with increasing adjustment of the delivery of the pump to the particular needs is back regulated to a defined starting point. Accordingly, in a renewed change of the operating point of the internal combustion engine be reacted again by means of the metering unit with a high control quality on this change.
  • the change in the throttle amount and the delivery rate is additionally made according to a further controlled variable in the form of a dynamic reserve of the low pressure range.
  • the injection pressure prevailing in the high-pressure region is additionally influenced by a control of a pressure regulating valve.
  • this pressure regulating valve is provided in the region of the pressure accumulator.
  • the metering unit is arranged in a return line of the high-pressure fuel pump.
  • a regulation of the inlet to the high pressure fuel pump is made by adjusting a return amount to the reservoir at this position.
  • an additional throttle point in the return of the high-pressure fuel pump can thereby be omitted, which reduces the manufacturing effort.
  • a throttle point is provided in a return of the high-pressure fuel pump, via which a return to the reservoir takes place.
  • FIG. 1 shows a first preferred embodiment of a fuel injection system of an internal combustion engine according to the invention. As can be seen, this has a low-pressure region 1 and a high-pressure region 2, which are separated from one another via a high-pressure fuel pump 3.
  • the low-pressure region 1 and the high-pressure region 2 are illustrated only with the elements essential to the invention, it being clear to the person skilled in the art that further elements, not shown, are indispensable for the functioning of the present fuel injection system.
  • the low-pressure region 1 comprises a reservoir 4 from which fuel is drawn in via a feed pump 5 and conveyed through a filter 6 to a low-pressure part 7 of the high-pressure fuel pump 3.
  • the fuel passes through the low pressure part 7 and is used for lubrication, as well as for cooling moving parts.
  • the fuel passes to a metering unit 8, which is able to throttle the amount of fuel and to suction valves 9 - of which in the present case only one is shown - to convey.
  • the optionally throttled fuel enters a high pressure part 10 of the high pressure fuel pump 3 and is compressed within the high pressure part 10 in a manner known in the art to high pressure.
  • the compressed fuel quantity is conveyed on the part of the high-pressure region 2 into a pressure accumulator 11, from which a defined amount of fuel via fuel injectors 12, of which only one is shown, can be taken for injection into respectively assigned combustion chambers of the internal combustion engine.
  • the pressure accumulator 11 also has a pressure sensor 13, which detects the pressure prevailing in the accumulator 11 pressure.
  • the pressure accumulator 11 has a pressure regulating valve 14, via which specifically fuel can be conveyed back before the filter 6 of the low-pressure region 1.
  • FIG. 1 branches off from the inlet to the metering unit 8 further from a return line 15, via which an excessive, guided to the metering unit 8 amount of fuel can be returned to the reservoir 4.
  • the return line 15 is provided with a throttle point 16.
  • return flow lines 17 and 18 of the low-pressure part 7 of the high-pressure fuel pump 3 also open into the return line 15.
  • the feed pump 5 is formed in the fuel injection system according to the invention as a variable-volume feed pump which adjusts together with the metering unit 8, the high-pressure fuel pump 3 supplied low pressure.
  • the low-pressure quantity is defined by the delivered through the feed pump 5 to the metering unit 8 flow rate and by reaching the metering unit 8 in the high pressure part 10 throttle amount.
  • this low-pressure quantity is adjusted in accordance with an injection pressure to be reached in the respective operating point of the internal combustion engine in the pressure accumulator 11, wherein the fuel pressure prevailing in the pressure accumulator 11 is detected via the pressure sensor 13.
  • the adjustment of the low pressure quantity by the feed pump 5 and the metering unit 8 is such that initially a regulation of the low pressure mainly through the metering unit 8 by changing the Throttling amount is made and this throttling is back regulated with increasing change in the flow rate of the slower feed pump 5 again.
  • the back-regulation thus again ensures a certain dynamic reserve for reacting to a change in the operating point.
  • this dynamic reserve can be used as a further control variable in the adjustment of the low pressure quantity.
  • a higher required amount of fuel throttling is reduced via the metering unit 8, so that more fuel flows into the high pressure part 10 of the high pressure fuel pump 3.
  • the flow rate of the feed pump 5 is increased and increased beyond the need for adjusting the injection pressure demand, while the throttling of the metering unit 8 is back regulated back to a certain defined throttle position.
  • the already mentioned dynamic reserve is recovered in order to respond to further changes in the operating point of the internal combustion engine can.
  • the throttling of the metering unit 8 is increased and the delivery rate of the delivery pump 5 is reduced, whereby a further reduction of the delivery rate is achieved via the metering unit 8 while the throttling is reduced at the same time .
  • very rapid necessary reductions in the injection pressure can also be a reduction the pressure in the pressure accumulator 11 via the pressure regulating valve 14 can be achieved.
  • FIG. 2 a second preferred embodiment of a fuel injection system according to the invention is shown.
  • a metering unit 19 is arranged in the return line 15 in this case. Consequently, the amount of fuel supplied to the high-pressure part 10 of the high-pressure fuel pump 3 is adjusted via the metering unit 19 by controlling the fuel returned to the reservoir 4. In this way, an additional throttle point in the region of the return line 15 can be saved.

Abstract

The method involves compressing low pressure volume to high pressure, where the low pressure volume is supplied from a low pressure region (1). The low pressure volume is conveyed into a pressure reservoir (11) of a high pressure region (2) by a high pressure fuel pump (3). The low pressure volume of the high pressure fuel pump is dosed corresponding to injection pressure to be reached in an operating point of a combustion engine. The low pressure amount is adjusted by controlling a delivery rate of a feed pump (5) and a throttle amount of a dosing unit (8). An independent claim is also included for a fuel injection system of a combustion engine comprising a high pressure fuel pump.

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Verfahren zur Steuerung eines einen Niederdruck- und einen Hochdruckbereich aufweisenden Kraftstoffeinspritzsystems einer Brennkraftmaschine, wobei einer Hochdruckkraftstoffpumpe eine Niederdruckmenge aus dem Niederdruckbereich zugeführt wird, welche diese Niederdruckmenge auf Hochdruck verdichtet und in einen Druckspeicher des Hochdruckbereichs fördert, und wobei die Niederdruckmenge der Hochdruckkraftstoffpumpe entsprechend eines in einem Betriebspunkt der Brennkraftmaschine zu erreichenden Einspritzdrucks zudosiert wird. Die Erfindung betrifft des Weiteren den Aufbau eines derartigen Kraftstoffeinspritzsystems.The invention relates to a method for controlling a low-pressure and high-pressure fuel injection system of an internal combustion engine, wherein a high-pressure fuel pump, a low pressure amount is supplied from the low pressure region, which compresses this low pressure to high pressure and promotes pressure in an accumulator of the high pressure region, and wherein the low pressure of the high pressure fuel pump is metered in accordance with a to be reached in an operating point of the internal combustion engine injection pressure. The invention further relates to the structure of such a fuel injection system.

Kraftstoffeinspritzsysteme moderner Dieselmotoren sind heutzutage überwiegend als Common-Rail-Einspritzsysteme ausgebildet. Bei einem derartigen System wird unter Hochdruck stehender Kraftstoff durch die einzelnen Kraftstoffinjektoren der Zylinder aus einem Druckspeicher entnommen, welcher über eine Hochdruckkraftstoffpumpe mit der entsprechenden Kraftstoffmenge versorgt wird. Das Kraftstoffeinspritzsystem verfügt hierbei über einen Niederdruckbereich, aus welchem die erforderliche Kraftstoffmenge der Hochdruckkraftstoffpumpe zudosiert wird. Die Zudosierung zur Hochdruckkraftstoffpumpe erfolgt hierbei üblicherweise über eine vorgeschaltete Zumesseinheit oder eine mengenregelbare Förderpumpe.Fuel injection systems of modern diesel engines are predominantly designed today as common-rail injection systems. In such a system, high pressure fuel is withdrawn through the individual fuel injectors of the cylinders from a pressure accumulator, which is supplied via a high pressure fuel pump with the appropriate amount of fuel. The fuel injection system in this case has a low-pressure region, from which the required amount of fuel is metered into the high-pressure fuel pump. The metered addition to the high-pressure fuel pump is usually carried out via an upstream metering unit or a variable-volume feed pump.

Stand der TechnikState of the art

Aus der DE 19735561 A1 sind ein Verfahren zur Steuerung eines Kraftstoffeinspritzsystems einer Brennkraftmaschine, sowie ein derartiges System bekannt. Dieses Kraftstoffeinspritzsystem weist einen Niederdruck- und einen Hochdruckbereich auf, welche über eine Hochdruckkraftstoffpumpe voneinander getrennt sind. Der Hochdruckkraftstoffpumpe wird eine Niederdruckmenge aus dem Niederdruckbereich zugeführt, woraufhin die Pumpe diese Niederdruckmenge auf Hochdruck verdichtet und in einen Druckspeicher des Hochdruckbereichs fördert. Aus diesem Druckspeicher wird im weiteren Verlauf der zum Betrieb der Brennkraftmaschine nötige Kraftstoff durch Kraftstoffinjektoren der einzelnen Zylinder der Brennkraftmaschine zur Einspritzung in deren Brennräume entnommen. Zur Zudosierung der Niederdruckmenge zur Hochdruckkraftstoffpumpe ist dieser eine mengenregelbare Förderpumpe vorgeschaltet, welche entsprechend eines im Druckspeicher des Hochdruckbereichs zu erreichenden Einspritzdrucks die Niederdruckmenge einstellt. Um vor der Hochdruckkraftstoffpumpe hierbei einen nahezu konstanten Speisedruck zu gewährleisten, ist zwischen der mengenregelbaren Förderpumpe und der Hochdruckkraftstoffpumpe ein Ventil vorgesehen, das ab Erreichen eines bestimmten Speisedrucks in der Speiseleitung die Förderung zur Hochdruckkraftstoffpumpe ermöglicht. Des Weiteren ist der Förderpumpe ein Druckregelventil nachgeschaltet, um den Druck im Niederdruckbereich zu regulieren. Über dieses Druckregelventil wird Kraftstoff ab Überschreiten eines vorgegebenen Drucks in einen Vorratsbehälter zurückgeführt.From the DE 19735561 A1 are known a method for controlling a fuel injection system of an internal combustion engine, and such a system. This fuel injection system has a low-pressure and a high-pressure region, which are separated from one another via a high-pressure fuel pump. The high pressure fuel pump is supplied with a low pressure amount from the low pressure region, whereupon the pump compresses this low pressure quantity to high pressure and conveys it into an accumulator of the high pressure area. From this pressure accumulator necessary for the operation of the internal combustion engine fuel is taken by fuel injectors of the individual cylinders of the internal combustion engine for injection in the combustion chambers in the further course. For metering the low pressure quantity to the high-pressure fuel pump, this is preceded by a quantity-controllable delivery pump, which adjusts the low-pressure quantity in accordance with an injection pressure to be achieved in the pressure accumulator of the high-pressure region. In order to ensure a nearly constant feed pressure before the high-pressure fuel pump, a valve is provided between the flow-adjustable feed pump and the high-pressure fuel pump, which allows the promotion to high-pressure fuel pump from reaching a certain feed pressure in the feed line. Furthermore, the feed pump is followed by a pressure control valve to regulate the pressure in the low pressure range. About this pressure control valve fuel is returned from exceeding a predetermined pressure in a reservoir.

Ausgehend von dem vorstehend genannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren zur Steuerung eines Kraftstoffeinspritzsystems zur Verfügung zu stellen, welches eine möglichst effiziente und flexible Regelung eines Kraftstoffeinspritzsystems einer Brennkraftmaschine ermöglicht. Des Weiteren ist es Aufgabe der vorliegenden Erfindung, ein Kraftstoffeinspritzsystem einer Brennkraftmaschine zu schaffen, bei welchem eine effiziente Regelung möglich ist. Schließlich sollte ein derartiges Kraftstoffeinspritzsystem mit möglichst geringem fertigungstechnischem Aufwand realisierbar sein.Based on the above-mentioned prior art, the present invention seeks to provide a method for controlling a fuel injection system available, which allows the most efficient and flexible control of a fuel injection system of an internal combustion engine. Furthermore, it is an object of the present invention to provide a fuel injection system of an internal combustion engine, in which an efficient control is possible. Finally, such a fuel injection system should be feasible with the least possible manufacturing effort.

Aus verfahrenstechnischer Sicht wird die vorgenannte Aufgabe ausgehend von einem Oberbegriff des Anspruchs 1 in Verbindung mit dessen kennzeichnenden Merkmalen gelöst. Aus vorrichtungstechnischer Sicht erfolgt eine Lösung der Aufgabe entsprechend den technischen Ausgestaltungen des nebengeordneten Anspruchs 5. Die jeweils darauffolgenden, abhängigen Ansprüche geben vorteilhafte Weiterbildungen der Erfindung wieder.From the procedural point of view, the aforementioned object is achieved on the basis of a preamble of claim 1 in conjunction with its characterizing features. From a device technical point of view, a solution of the problem according to the technical embodiments of the independent claim 5. The following each dependent claims give advantageous developments of the invention again.

Offenbarung der ErfindungDisclosure of the invention

Die Erfindung umfasst die technische Lehre, dass eine Einstellung der der Hochdruckkraftstoffpumpe zudosierten Niederdruckmenge durch eine Regelung einer Fördermenge einer Förderpumpe und einer Drosselmenge einer Zumesseinheit erfolgt. Der mengenregelbaren Förderpumpe ist hierzu eine Zumesseinheit nachgeschaltet, welche gemeinsam mit der Förderpumpe die der Hochdruckkraftstoffpumpe zugeführte Niederdruckmenge einstellt. Ein derartiger Aufbau und ein derartiges Verfahren haben den Vorteil, dass eine effiziente Regelung der zudosierten Niederdruckmenge nach Art einer Mehrgrößenregelung in Abhängigkeit zu erreichenden Einspritzdrucks realisiert werden kann. Denn durch das Zusammenspiel der mengenregulierbaren Förderpumpe und einer Drosselung über die nachgeschaltete Zumesseinheit kann eine schnelle und präzise Einstellung der zuzudosierenden Niederdruckmenge erfolgen. Vorteilhafterweise kann hierbei ein üblicherweise in einem Rücklauf zum Vorratsbehälter platziertes Überströmventil entfallen, da der Zumesseinheit durch die vorgeschaltete, mengenregelbare Förderpumpe Kraftstoff im Bereich der im jeweiligen Betriebspunkt der Brennkraftmaschine benötigten Menge zugeführt wird. Folglich kann ein ansonsten vorzusehendes, komplexes Bauteil eingespart werden, was den herstellungstechnischen Aufwand verringert.The invention comprises the technical teaching that an adjustment of the high-pressure fuel pump metered low-pressure quantity is carried out by controlling a flow rate of a feed pump and a throttle amount of a metering unit. The volume adjustable feed pump is followed by a metering unit, which together with the feed pump adjusts the high pressure fuel pump supplied low pressure. Such a structure and such a method have the advantage that an efficient control of the metered low-pressure quantity in the manner of a multi-variable control in dependence on the injection pressure to be achieved can be realized. Because of the interaction of the volume-adjustable feed pump and a throttling via the downstream metering unit, a fast and precise adjustment of the low-pressure quantity to be metered can take place. Advantageously, in this case can be omitted a usually placed in a return to the reservoir overflow valve, as the metering unit is supplied by the upstream, volume-adjustable feed pump fuel in the range required in each operating point of the internal combustion engine. Consequently, an otherwise envisaged, complex component can be saved, which reduces the manufacturing effort.

Im Gegensatz hierzu ist das Kraftstoffeinspritzsystem, sowie das Verfahren zur Steuerung des selbigen der DE 19735561 A1 komplexer ausgestaltet. Zwar erfolgt eine Zudosierung über eine mengenregelbare Förderpumpe, um jedoch eine geeignete Zudosierung zur Hochdruckkraftstoffpumpe realisieren zu können, ist eine vom Hochdruckbereich losgelöste Regelung des Niederdruckbereichs über das Druckregelventil nötig. Hierdurch gestalten sich die Regelung und der Aufbau des Kraftstoffeinspritzsystems aufwendiger.In contrast, the fuel injection system, as well as the method of controlling the same is the DE 19735561 A1 more complex. Although metered addition is effected by means of a flow controlled delivery pump, in order to be able to realize a suitable addition to the high-pressure fuel pump, however, regulation of the low-pressure region via the pressure regulating valve which is detached from the high-pressure region is necessary. As a result, the control and the structure of the fuel injection system make more complicated.

In Weiterbildung der Erfindung wird eine Einstellung der Niederdruckmenge zunächst überwiegend über eine Veränderung der Drosselmenge der Zumesseinheit vorgenommen, wobei mit zunehmender Veränderung der Fördermenge der Förderpumpe die Drosselmenge wieder entsprechend zurückgeregelt wird. Dies hat den Vorteil, dass eine sehr schnelle Einstellung der Niederdruckmenge erfolgen kann, wobei gleichzeitig eine Dynamikreserve zur schnellen Reaktion auf eine Änderung des Betriebspunktes der Brennkraftmaschine gebildet wird. Denn durch die Zumesseinheit kann durch Veränderung der Drosselmenge eine sehr rasche Verminderung oder Erhöhung der zur Hochdruckkraftstoffpumpe zudosierten Kraftstoffmenge erfolgen, wohingegen die Einstellung der Kraftstoffmenge über die Förderpumpe eine verhältnismäßig hohe Regelzeit in Anspruch nimmt. Somit kann durch die Zumesseinheit schnell auf nötige Änderungen der Niederdruckmenge reagiert werden und anschließend eine Nachregelung über die Fördermenge der Förderpumpe erfolgen, wobei die Drosselmenge der Zumesseinheit mit steigender Anpassung der Fördermenge der Förderpumpe an den jeweiligen Bedarf wieder auf einen definierten Ausgangspunkt zurückgeregelt wird. Dementsprechend kann bei einer erneuten Änderung des Betriebspunktes der Brennkraftmaschine mittels der Zumesseinheit erneut mit einer hohen Regelgüte auf diese Veränderung reagiert werden.In a further development of the invention, a setting of the low pressure amount is initially made predominantly via a change in the throttle amount of the metering unit, with increasing change in the delivery rate of the feed pump, the throttle amount is back regulated accordingly. This has the advantage that a very rapid adjustment of the low-pressure quantity can take place, at the same time a dynamic reserve being formed for the rapid reaction to a change in the operating point of the internal combustion engine. Because by the metering unit can be done by changing the throttle amount a very rapid reduction or increase in the metered to the high-pressure fuel pump amount of fuel, whereas the adjustment of the amount of fuel via the feed pump takes a relatively high control time. Thus, by the metering unit can be reacted quickly to necessary changes in the low pressure and then carried out a readjustment on the delivery of the pump, the throttle amount of the metering unit with increasing adjustment of the delivery of the pump to the particular needs is back regulated to a defined starting point. Accordingly, in a renewed change of the operating point of the internal combustion engine be reacted again by means of the metering unit with a high control quality on this change.

Gemäß einer weiteren, vorteilhaften Ausgestaltung der Erfindung wird die Veränderung der Drosselmenge und der Fördermenge zusätzlich entsprechend einer weiteren Regelgröße in Form einer Dynamikreserve des Niederdruckbereichs vorgenommen. Hierdurch kann die Regelung des Einspritzdrucks im Hochdruckbereich weiter verbessert werden, indem eine Regelung der Förderpumpe und der Zumesseinheit entsprechend vorhandener Dynamikreserven im Niederdruckbereich erfolgt.According to a further advantageous embodiment of the invention, the change in the throttle amount and the delivery rate is additionally made according to a further controlled variable in the form of a dynamic reserve of the low pressure range. As a result, the regulation of the injection pressure in the high-pressure region can be further improved by controlling the delivery pump and the metering unit in accordance with existing dynamic reserves in the low-pressure region.

In Weiterbildung der Erfindung wird der im Hochdruckbereich vorherrschende Einspritzdruck zusätzlich durch eine Ansteuerung eines Druckregelventils beeinflusst. Vorteilhafterweise ist dieses Druckregelventil im Bereich des Druckspeichers vorgesehen. Durch diese Maßnahme kann eine schnelle Verminderung des Einspritzdrucks durch das Druckregelventil herbeigeführt werden, was die Regelgüte des Kraftstoffeinspritzsystems weiter steigert.In a further development of the invention, the injection pressure prevailing in the high-pressure region is additionally influenced by a control of a pressure regulating valve. Advantageously, this pressure regulating valve is provided in the region of the pressure accumulator. By this measure, a rapid reduction of the injection pressure can be brought about by the pressure control valve, which further increases the control performance of the fuel injection system.

Entsprechend einer weiteren Ausführungsform der Erfindung ist die Zumesseinheit in einem Rücklauf der Hochdruckkraftstoffpumpe angeordnet. Durch die Zumesseinheit wird an dieser Position eine Regelung des Zulaufs zur Hockdruckkraftstoffpumpe durch Einstellen einer Rücklaufmenge zum Vorratsbehälter vorgenommen. Folglich kann hierdurch eine zusätzliche Drosselstelle im Rücklauf der Hochdruckraftstoffpumpe entfallen, was den herstellungstechnischen Aufwand vermindert. Alternativ hierzu ist in einem Rücklauf der Hochdruckkraftstoffpumpe eine Drosselstelle vorgesehen, über welche eine Rückführung zum Vorratsbehälter erfolgt.According to a further embodiment of the invention, the metering unit is arranged in a return line of the high-pressure fuel pump. By the metering unit, a regulation of the inlet to the high pressure fuel pump is made by adjusting a return amount to the reservoir at this position. As a result, an additional throttle point in the return of the high-pressure fuel pump can thereby be omitted, which reduces the manufacturing effort. Alternatively, a throttle point is provided in a return of the high-pressure fuel pump, via which a return to the reservoir takes place.

Weitere, die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung bevorzugter Ausführungsformen der Erfindung anhand von Figuren näher dargestellt.Further, measures improving the invention will be described in more detail below together with the description of preferred embodiments of the invention with reference to figures.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Es zeigt:

Figur 1
eine schematische Darstellung des erfindungsgemäßen Kraftstoffeinspritzsystems gemäß einer ersten bevorzugten Ausführungsform der Erfindung; und
Figur 2
eine schematische Darstellung des erfindungsgemäßen Kraftstoffeinspritzsystems gemäß einer zweiten bevorzugten Ausführungsform der Erfindung.
It shows:
FIG. 1
a schematic representation of the fuel injection system according to the invention according to a first preferred embodiment of the invention; and
FIG. 2
a schematic representation of the fuel injection system according to the invention according to a second preferred embodiment of the invention.

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Aus Figur 1 geht eine erste bevorzugte Ausführungsform eines erfindungsgemäßen Kraftstoffeinspritzsystems einer Brennkraftmaschine hervor. Wie zu erkennen ist, verfügt dieses über einen Niederdruckbereich 1 und einen Hochdruckbereich 2, welche über eine Hochdruckkraftstoffpumpe 3 voneinander getrennt sind. Aus Gründen der Übersichtlichkeit sind der Niederdruckbereich 1 und der Hochdruckbereich 2 nur mit den für die Erfindung wesentlichen Elementen dargestellt, wobei dem Fachmann klar sein wird, dass für eine Funktionstüchtigkeit des vorliegenden Kraftstoffeinspritzsystems weitere, nicht dargestellte Elemente unerlässlich sind.Out FIG. 1 shows a first preferred embodiment of a fuel injection system of an internal combustion engine according to the invention. As can be seen, this has a low-pressure region 1 and a high-pressure region 2, which are separated from one another via a high-pressure fuel pump 3. For reasons of clarity, the low-pressure region 1 and the high-pressure region 2 are illustrated only with the elements essential to the invention, it being clear to the person skilled in the art that further elements, not shown, are indispensable for the functioning of the present fuel injection system.

Der Niederdruckbereich 1 umfasst einen Vorratsbehälter 4, aus welchem über eine Förderpumpe 5 Kraftstoff angesaugt und durch einen Filter 6 zu einem Niederdruckteil 7 der Hochdruckkraftstoffpumpe 3 gefördert wird. Hierbei durchläuft der Kraftstoff den Niederdruckteil 7 und wird zur Schmierung, sowie zur Kühlung bewegter Teile herangezogen. Im Anschluss daran gelangt der Kraftstoff zu einer Zumesseinheit 8, welche im Stande ist, die Kraftstoffmenge zu drosseln und zu Saugventilen 9 - von welchen vorliegend nur eines dargestellt ist - zu befördern. Über diese Saugventile 9 gelangt der gegebenenfalls gedrosselte Kraftstoff in einen Hochdruckteil 10 der Hochdruckkraftstoffpumpe 3 und wird innerhalb des Hochdruckteils 10 auf dem Fachmann bekannter Art und Weise auf Hochdruck verdichtet.The low-pressure region 1 comprises a reservoir 4 from which fuel is drawn in via a feed pump 5 and conveyed through a filter 6 to a low-pressure part 7 of the high-pressure fuel pump 3. Here, the fuel passes through the low pressure part 7 and is used for lubrication, as well as for cooling moving parts. Subsequently, the fuel passes to a metering unit 8, which is able to throttle the amount of fuel and to suction valves 9 - of which in the present case only one is shown - to convey. About this suction valves 9, the optionally throttled fuel enters a high pressure part 10 of the high pressure fuel pump 3 and is compressed within the high pressure part 10 in a manner known in the art to high pressure.

Ausgehend vom Hochdruckteil 10 wird die verdichtete Kraftstoffmenge auf Seiten des Hochdruckbereichs 2 in einen Druckspeicher 11 gefördert, aus welchem eine definierte Kraftstoffmenge über Kraftstoffinjektoren 12, von welchen vorliegend nur einer dargestellt ist, zur Einspritzung in jeweils zugeordnete Brennräume der Brennkraftmaschine entnommen werden kann. Der Druckspeicher 11 weist zudem einen Drucksensor 13 auf, welcher den im Druckspeicher 11 vorherrschenden Druck erfasst. Des Weiteren verfügt der Druckspeicher 11 über ein Druckregelventil 14, über das gezielt Kraftstoff vor den Filter 6 des Niederdruckbereichs 1 zurückgefördert werden kann.Starting from the high-pressure part 10, the compressed fuel quantity is conveyed on the part of the high-pressure region 2 into a pressure accumulator 11, from which a defined amount of fuel via fuel injectors 12, of which only one is shown, can be taken for injection into respectively assigned combustion chambers of the internal combustion engine. The pressure accumulator 11 also has a pressure sensor 13, which detects the pressure prevailing in the accumulator 11 pressure. Furthermore, the pressure accumulator 11 has a pressure regulating valve 14, via which specifically fuel can be conveyed back before the filter 6 of the low-pressure region 1.

Wie des Weiteren aus Figur 1 ersichtlich ist, zweigt von dem Zulauf zur Zumesseinheit 8 des Weiteren eine Rücklaufleitung 15 ab, über welche eine übermäßige, zur Zumesseinheit 8 geführte Kraftstoffmenge in den Vorratsbehälter 4 zurückbefördert werden kann. Um vor der Zumesseinheit 8 ein bestimmtes Druckniveau zu garantieren, ist die Rücklaufleitung 15 mit einer Drosselstelle 16 versehen. Des Weiteren münden in die Rücklaufleitung 15 auch Rückströmleitungen 17 und 18 des Niederdruckteils 7 der Hochdruckkraftstoffpumpe 3 ein.As further out FIG. 1 can be seen, branches off from the inlet to the metering unit 8 further from a return line 15, via which an excessive, guided to the metering unit 8 amount of fuel can be returned to the reservoir 4. To guarantee a certain pressure level in front of the metering unit 8 is the return line 15 is provided with a throttle point 16. Furthermore, return flow lines 17 and 18 of the low-pressure part 7 of the high-pressure fuel pump 3 also open into the return line 15.

Als Besonderheit ist die Förderpumpe 5 bei dem erfindungsgemäßen Kraftstoffeinspritzsystem als mengenregelbare Förderpumpe ausgebildet, die gemeinsam mit der Zumesseinheit 8 die der Hochdruckkraftstoffpumpe 3 zugeführte Niederdruckmenge einstellt. Die Niederdruckmenge wird dabei durch die über die Förderpumpe 5 zur Zumesseinheit 8 geförderte Fördermenge und durch die über die Zumesseinheit 8 in den Hochdruckteil 10 gelangende Drosselmenge definiert. Dabei wird diese Niederdruckmenge entsprechend eines in dem jeweiligen Betriebspunkt der Brennkraftmaschine im Druckspeicher 11 zu erreichenden Einspritzdrucks eingeregelt, wobei der im Druckspeicher 11 vorherrschende Kraftstoffdruck über den Drucksensor 13 erfasst wird.As a special feature, the feed pump 5 is formed in the fuel injection system according to the invention as a variable-volume feed pump which adjusts together with the metering unit 8, the high-pressure fuel pump 3 supplied low pressure. The low-pressure quantity is defined by the delivered through the feed pump 5 to the metering unit 8 flow rate and by reaching the metering unit 8 in the high pressure part 10 throttle amount. In this case, this low-pressure quantity is adjusted in accordance with an injection pressure to be reached in the respective operating point of the internal combustion engine in the pressure accumulator 11, wherein the fuel pressure prevailing in the pressure accumulator 11 is detected via the pressure sensor 13.

Um bei der Einstellung der Niederdruckmenge eine möglichst schnelle Reaktion auf eine Änderung des Betriebspunkts der Brennkraftmaschine gewährleisten zu können, erfolgt die Einstellung der Niederdruckmenge durch die Förderpumpe 5 und die Zumesseinheit 8 derart, dass zunächst eine Regelung der Niederdruckmenge überwiegend über die Zumesseinheit 8 durch Veränderung der Drosselmenge vorgenommen wird und diese Drosselung mit zunehmender Veränderung der Fördermenge der trägeren Förderpumpe 5 wieder entsprechend zurückgeregelt wird. Durch die Zurückregelung wird somit erneut eine bestimmte Dynamikreserve zur erneuten Reaktion auf eine Veränderung des Betriebspunkts sichergestellt. Dabei kann diese Dynamikreserve als weitere Regelgröße bei der Einstellung der Niederdruckmenge herangezogen werden. Bei einer höheren benötigten Kraftstoffmenge wird die Drosselung über die Zumesseinheit 8 vermindert, so dass mehr Kraftstoff in den Hochdruckteil 10 der Hochdruckkraftstoffpumpe 3 strömt. Gleichzeitig wird die Fördermenge der Förderpumpe 5 erhöht und über den zur Einstellung des Einspritzdrucks benötigten Bedarf hinaus gesteigert, wobei dabei die Drosselung der Zumesseinheit 8 wieder in eine bestimmte definierte Drosselposition zurückgeregelt wird. Hierdurch wird die bereits erwähnte Dynamikreserve wiedererlangt, um auf weitere Änderungen des Betriebspunkts der Brennkraftmaschine reagieren zu können. Soll die dem Hochdruckteil 10 zugeführte Kraftstoffmenge verringert werden, so wird die Drosselung der Zumesseinheit 8 erhöht und gleichzeitig die Fördermenge der Förderpumpe 5 vermindert, wobei erneut ab Erreichen des geforderten Bedarfs eine weitere Verminderung der Fördermenge bei gleichzeitiger Verringerung der Drosselung über die Zumesseinheit 8 herbeigeführt wird. Im Falle sehr rascher nötiger Verminderungen des Einspritzdrucks kann zudem eine Absenkung des Drucks im Druckspeicher 11 über das Druckregelventil 14 erreicht werden.In order to ensure the fastest possible response to a change in the operating point of the internal combustion engine when setting the low pressure, the adjustment of the low pressure quantity by the feed pump 5 and the metering unit 8 is such that initially a regulation of the low pressure mainly through the metering unit 8 by changing the Throttling amount is made and this throttling is back regulated with increasing change in the flow rate of the slower feed pump 5 again. The back-regulation thus again ensures a certain dynamic reserve for reacting to a change in the operating point. In this case, this dynamic reserve can be used as a further control variable in the adjustment of the low pressure quantity. At a higher required amount of fuel throttling is reduced via the metering unit 8, so that more fuel flows into the high pressure part 10 of the high pressure fuel pump 3. At the same time, the flow rate of the feed pump 5 is increased and increased beyond the need for adjusting the injection pressure demand, while the throttling of the metering unit 8 is back regulated back to a certain defined throttle position. As a result, the already mentioned dynamic reserve is recovered in order to respond to further changes in the operating point of the internal combustion engine can. If the quantity of fuel supplied to the high-pressure part 10 is to be reduced, the throttling of the metering unit 8 is increased and the delivery rate of the delivery pump 5 is reduced, whereby a further reduction of the delivery rate is achieved via the metering unit 8 while the throttling is reduced at the same time , In the case of very rapid necessary reductions in the injection pressure can also be a reduction the pressure in the pressure accumulator 11 via the pressure regulating valve 14 can be achieved.

In Figur 2 ist eine zweite bevorzugte Ausführungsform eines erfindungsgemäßen Kraftstoffeinspritzsystems dargestellt. Im Unterschied zu der im Vorfeld beschriebenen Variante, ist eine Zumesseinheit 19 in diesem Fall in der Rücklaufleitung 15 angeordnet. Folglich wird über die Zumesseinheit 19 die dem Hochdruckteil 10 der Hochdruckkraftstoffpumpe 3 zugeführte Kraftstoffmenge durch Regelung des in den Vorratsbehälter 4 zurückgeführten Kraftstoffs eingestellt. Auf diese Art und Weise kann eine zusätzliche Drosselstelle im Bereich der Rücklaufleitung 15 eingespart werden.In FIG. 2 a second preferred embodiment of a fuel injection system according to the invention is shown. In contrast to the variant described above, a metering unit 19 is arranged in the return line 15 in this case. Consequently, the amount of fuel supplied to the high-pressure part 10 of the high-pressure fuel pump 3 is adjusted via the metering unit 19 by controlling the fuel returned to the reservoir 4. In this way, an additional throttle point in the region of the return line 15 can be saved.

Mittels des erfindungsgemäßen Kraftstoffeinspritzsystems, sowie des erfindungsgemäßen Verfahrens zur Regelung des selbigen kann eine effiziente und flexible Regelung eines Einspritzdrucks der Brennkraftmaschine realisiert werden. Des Weiteren kann das erfindungsgemäße Kraftstoffeinspritzsystem mit niedrigem Herstellungsaufwand verwirklicht werden.By means of the fuel injection system according to the invention, as well as the method according to the invention for controlling the same, an efficient and flexible control of an injection pressure of the internal combustion engine can be realized. Furthermore, the fuel injection system of the present invention can be realized with a low manufacturing cost.

Claims (8)

Verfahren zur Steuerung eines einen Niederdruck- (1) und einen Hochdruckbereich (2) aufweisenden Kraftstoffeinspritzsystems einer Brennkraftmaschine, wobei eine Hochdruckkraftstoffpumpe (3) eine Niederdruckmenge aus dem Niederdruckbereich (1) zugeführt wird, welche diese Niederdruckmenge auf Hochdruck verdichtet und in einen Druckspeicher (11) des Hochdruckbereichs (2) fördert, und wobei die Niederdruckmenge der Hochdruckkraftstoffpumpe (3) entsprechend eines in einem Betriebspunkt der Brennkraftmaschine zu erreichenden Einspritzdrucks zudosiert wird,
dadurch gekennzeichnet, dass die Niederdruckmenge durch eine Regelung einer Fördermenge einer Förderpumpe (5) und einer Drosselmenge einer Zumesseinheit (8; 19) eingestellt wird.Method for controlling a low-pressure (1) and a high-pressure region (2) having a fuel injection system of an internal combustion engine, wherein a high-pressure fuel pump (3) is supplied from the low-pressure region (1), which compresses this low-pressure amount to high pressure and into a pressure accumulator (11 ) of the high-pressure region (2), and wherein the low-pressure quantity of the high-pressure fuel pump (3) is metered according to an injection pressure to be reached at an operating point of the internal combustion engine,
characterized in that the low-pressure amount is adjusted by controlling a delivery amount of a delivery pump (5) and a throttle amount of a metering unit (8; 19). Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass eine Einstellung der Niederdruckmenge zunächst überwiegend über eine Veränderung der Drosselmenge der Zumesseinheit (8; 19) vorgenommen wird, wobei mit zunehmender Veränderung der Fördermenge der Förderpumpe (5) die Drosselmenge wieder entsprechend zurückgeregelt wird.Method according to claim 1,
characterized in that an adjustment of the low-pressure quantity is initially carried out predominantly via a change in the throttle amount of the metering unit (8; 19), the throttle amount being correspondingly back-regulated with increasing change in the delivery rate of the feed pump (5). Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die Veränderung der Drosselmenge und der Fördermenge zusätzlich entsprechend einer weiteren Regelgröße in Form einer Dynamikreserve des Niederdruckbereichs (1) vorgenommen wird.Method according to claim 1 or 2,
characterized in that the change in the throttle amount and the delivery rate is additionally carried out in accordance with a further controlled variable in the form of a dynamic reserve of the low-pressure region (1). Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass der im Hochdruckbereich (2) vorherrschende Einspritzdruck zusätzlich durch eine Ansteuerung eines Druckregelventils (14) beeinflusst wird.Method according to one of claims 1 to 3,
characterized in that the in the high pressure region (2) prevailing injection pressure is additionally influenced by a control of a pressure control valve (14). Kraftstoffeinspritzsystem einer Brennkraftmaschine, mit einem Niederdruck-(1) und einem Hochdruckbereich (2), wobei eine Hochdruckkraftstoffpumpe (3) eine aus dem Niederdruckbereich (1) zugeführte Niederdruckmenge auf Hochdruck verdichtet und in einen Druckspeicher (11) fördert, und wobei der Niederdruckbereich (1) eine mengenregelbare Förderpumpe (5) umfasst, welche die Niederdruckmenge entsprechend eines in einem Betriebspunkt der Brennkraftmaschine zu erreichenden Einspritzdrucks der Hochdruckkraftstoffpumpe (3) zudosiert,
dadurch gekennzeichnet, dass der mengenregelbaren Förderpumpe (5) eine Zumesseinheit (8; 19) nachgeschaltet ist, welche gemeinsam mit der Förderpumpe (5) die der Hochdruckkraftstoffpumpe (3) zugeführte Niederdruckmenge einstellt.A fuel injection system of an internal combustion engine, comprising a low-pressure (1) and a high-pressure region (2), wherein a high-pressure fuel pump (3) compresses a low-pressure quantity supplied from the low-pressure region (1) to high pressure and delivers it to an accumulator (11), and wherein the low-pressure region ( 1) comprises a variable-volume feed pump (5) corresponding to the low-pressure quantity a to be reached in an operating point of the internal combustion engine injection pressure of the high-pressure fuel pump (3),
characterized in that the volume-controllable feed pump (5) a metering unit (8; 19) is connected downstream, which adjusts the high-pressure fuel pump (3) supplied low pressure quantity together with the feed pump (5). Kraftstoffeinspritzsystem nach Anspruch 5,
dadurch gekennzeichnet, dass die Zumesseinheit (19) in einem Rücklauf der Hochdruckkraftpumpe (3) angeordnet ist.Fuel injection system according to claim 5,
characterized in that the metering unit (19) is arranged in a return of the high-pressure force pump (3). Kraftstoffeinspritzsystem nach Anspruch 5,
dadurch gekennzeichnet, dass in einem Rücklauf der Hochdruckkraftstoffpumpe (3) eine Drosselstelle (16) vorgesehen ist.Fuel injection system according to claim 5,
characterized in that a throttle point (16) is provided in a return of the high-pressure fuel pump (3). Kraftstoffeinspritzsystem nach einem der Ansprüche 5 bis 7,
dadurch gekennzeichnet, dass der Druckspeicher (11) über ein Druckregelventil (14) verfügt.Fuel injection system according to one of claims 5 to 7,
characterized in that the pressure accumulator (11) has a pressure regulating valve (14).
EP11182137.7A 2010-11-04 2011-09-21 Fuel injection system of a combustion engine and method for controlling same Not-in-force EP2450553B1 (en)

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EP2450553B1 (en) 2019-09-11
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