EP2459865B1 - High pressure injection system having fuel cooling from low pressure region - Google Patents
High pressure injection system having fuel cooling from low pressure region Download PDFInfo
- Publication number
- EP2459865B1 EP2459865B1 EP10722121.0A EP10722121A EP2459865B1 EP 2459865 B1 EP2459865 B1 EP 2459865B1 EP 10722121 A EP10722121 A EP 10722121A EP 2459865 B1 EP2459865 B1 EP 2459865B1
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- EP
- European Patent Office
- Prior art keywords
- fuel
- high pressure
- line
- mixing point
- return
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- 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.)
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Classifications
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- 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
- F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
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- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/002—Arrangement of leakage or drain conduits in or from injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
Definitions
- the invention relates to a high-pressure injection system, in particular to a high-pressure accumulator injection system for internal combustion engines, with a fuel tank, from which the fuel is passed via a fuel delivery pump and a line system to the high-pressure pump. Due to the compression of the fuel in the high-pressure pump, the fuel temperature rises.
- the compressed fuel is passed from the high pressure pump through another line in a high-pressure accumulator, which in turn is connected to at least one fuel injection valve.
- compressed fuel is injected from the fuel injection valve into a combustion chamber.
- a portion of the fuel injection valve supplied fuel passes via leakage in the fuel injection valve or as a control amount from the fuel injection valve in the return line, wherein these leakage quantities additionally heat by relaxing when flowing through the fuel injection valve.
- the invention is based on the recognition that in unfavorable conditions (almost empty fuel tank, small volume of fuel, which is often pumped in a circle) and corresponding load cases operating conditions may occur in which the fuel is heated above a permissible limit temperature, so that There is a deterioration (aging) of the fuel, which leads to the reduction of the lubricating properties of the fuel and thus to increased mechanical wear in the system. In addition, due to the increased return temperatures possibly more expensive materials for the execution of the return lines to use.
- a cooling line is provided for admixing fuel from cooler regions of the low-pressure region between the fuel tank and the high-pressure pump, via which cooler fuel can be added to the fuel return.
- a first embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling between a fuel pump and the high-pressure pump and this volume flow for cooling via a mixing point the leakage flow from the fuel injectors, which, for example, as a common rail Injectors can be executed.
- the fuel pump is always ensured that a volume flow is available under sufficient pressure for cooling purposes, so that this design can do without further control mechanisms.
- An advantage of this design is further that can be omitted by the fuel pump a prefeed pump on the high-pressure pump.
- a further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from the prefeed pump arranged on the high-pressure pump and supplies this volume flow via a mixing point to the leakage flow from the fuel injection valves.
- the prefeed pump directly to the high-pressure pump, which may for example be designed as a gear pump, which sucks a volume flow from the fuel tank, the fuel pump can be omitted.
- An advantage of this design is that the cooling line can be made correspondingly short and therefore cost.
- a further embodiment of the fuel injection system is characterized in that the cooling line leads directly from the fuel tank to the mixing point with the leakage flow from the fuel injection valve, wherein in the return line from the mixing point back to the fuel tank, for example, a suction pump is arranged so that in the Return line always a lower pressure than in the cooling line prevails.
- a further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from a return of the high-pressure pump and supplies this volume flow via the mixing point to the leakage flow from the fuel injection valve.
- An advantage of this design is that the return flow from the high-pressure pump delivers a comparatively large volume flow.
- an existing return line from the high pressure pump can be arranged so that it connects the return to the mixing point, so that no additional components are needed.
- the mixing point at which the cooling line and the leakage from the fuel injection valves meet arranged as close as possible to the fuel injection valve.
- a further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from a return line of the high-pressure pump and this volume flow can be divided via a throttle or a valve so that a subset of the volume flow for cooling through the cooling line the mixing point is passed and another subset is connected directly via the return line of the high-pressure pump with the fuel return to the fuel tank.
- An advantage of this design is that the volume flow used for cooling can be regulated by the cooling line accordingly.
- Another embodiment of the fuel injection system is characterized in that a sensor for measuring temperature or a sensor for flow measurement is arranged at the mixing point, so that the volume flow through the cooling line, for example by an adjustable throttle or a valve can be controlled such that always a for Cooling sufficient volume flow through the cooling line is fed to the mixing point.
- This embodiment has the advantage that, especially at lower system temperatures, no unnecessarily high volume flow is conveyed through the cooling line and thus the overall efficiency of the system is not unnecessarily reduced.
- Fig. 1 is a well-known from the prior art high pressure injection system shown schematically. From a fuel tank 1, fuel is conveyed to a prefeed pump 4 and to a high-pressure pump 10 by means of a fuel feed pump 2 via a connecting line 3. The fuel tank 1, the fuel delivery pump 2, the connecting line 3 and the prefeed pump 4 are subjected to low pressure and are therefore assigned to the low-pressure region.
- a fuel return 11 is arranged, which is connected via a return line 12 and a further return line 22 to the fuel tank 1.
- a high-pressure lines 13 leads from the high-pressure pump 10, a high-pressure lines 13 to a high-pressure accumulator 14, which is also referred to as a common rail, which is connected via further high-pressure lines 15 to the fuel injection valves 20.
- the presence of a high pressure accumulator 14 is not necessarily required.
- the fuel compressed by the high-pressure pump 10 is injected by opening the fuel injection valves 20 into a combustion chamber.
- a portion of the fuel injection valve 20 supplied fuel is expanded in the fuel injection valve 20 and passes as a control amount or leakage amount in the return line 21, which the fuel injection valve 20, possibly via a further return line 22, with that described in paragraph 1 Low pressure range, in particular with the fuel tank 1 connects.
- the flow direction of the fuel is shown in the schematic drawing in each case by arrows next to the corresponding lines.
- a pressure relief valve 16 is arranged, which is connected via the return line 17 with a mixing point 24 at which meet the flow rates from the return line 17 from the pressure relief valve 16 and the return line 21 from the fuel injection valve 20 and from where this Volumetric flow passes through a further return line 22 into the fuel tank 1. If the pressure in the high-pressure accumulator 14 exceeds a maximum predetermined value, then the pressure relief valve 16 opens and the overpressure in the high-pressure accumulator 14 is reduced by the venting of fuel into the return line 17.
- cooler fuel from the low-pressure region is mixed with the leakage amount from the fuel injection valve by means of a cooling line to reduce the temperatures in the return lines 21 and 22.
- Fig. 2 a first embodiment of the high-pressure injection system according to the invention is shown, compared to the illustration in Fig. 1 contains an additional cooling line 5, which leads from the low-pressure region of the injection system to a mixing point 23 at which the cooler fuel from the cooling line 5 mixed with the fuel from the leakage of the fuel injection valve 20 and thus the temperature in the return lines 21 and 22nd lowered accordingly.
- the cooling line 5 is fed by the fuel delivery pump 2, so that the fuel can flow through the cooling line 5 to the mixing point 23.
- the fuel delivery pump 2 is controlled so that always a sufficient amount of cooler fuel is conveyed through the cooling line 5 to the mixing point 23.
- the fuel delivery pump 2 is to be designed so that the pressure in the connecting line 3 and the cooling line 5 is always higher than the pressure at the mixing point 23, so that the flow direction as shown in FIG Fig. 2 established.
- the prefeed pump 4 can be omitted.
- Fig. 3 a further embodiment of the high-pressure injection system according to the invention is shown, in which the additional cooling line 5 is arranged between the prefeed pump 4 and the mixing point 23, via which cooler fuel from the low-pressure region is pumped to the mixing point 23, wherein the prefeed pump must be designed so that it generates a pressure higher than the pressure in the return line 21 in order to ensure the flow direction from the mixing point 23 via the return lines 21 and 22 to the fuel tank 1. If the prefeed pump 4 has sufficient suction power to draw in the fuel from the fuel tank 1, the fuel feed pump 2 can be dispensed with.
- Fig. 4 another embodiment is shown in which the cooling line 5 is disposed between the return 11 of the high-pressure pump 10 and the mixing point 23 of the volume flows from the leakage of the fuel injection valve 20, wherein the return 11 of the high-pressure pump 10 must be designed so that in the return 11, a higher pressure than the pressure in the return line 21 prevails in order to ensure the flow direction from the mixing point 23 via the return lines 21 and 22 to the fuel tank 1.
- the return line 12 of the high-pressure pump 10 is omitted.
- either the fuel delivery pump 2 or the feed pump 4 can be omitted.
- Fig. 5 another embodiment is shown, in which the cooling line 5 is arranged between the fuel tank 1 and the mixing point 23.
- a vacuum pump 25 is arranged in the return line 22, wherein the vacuum pump 25 must be designed so that in the return 21 and 22, a lower pressure than in the cooling line 5 and the mixing point 23 prevails, the flow direction from the mixing point 23 via the return lines 21st and 22 to ensure the fuel tank 1.
- either the fuel pump 2 or the feed pump 4 can be omitted.
- Fig. 6 another embodiment is shown, which differs from the representation in Fig. 2 the return line 17 between pressure relief valve 16 and mixing point 23 is arranged, wherein the return line 17 can be made shorter than in the other embodiments.
- Fig. 7 another embodiment is shown, wherein different from Fig. 4 the cooling line 5 is not fed directly from the return 11 of the high-pressure pump 10, but the volume flow in the cooling line 5 is regulated by a arranged in the return line 12 of the high-pressure pump 10 valve 7.
- Fig. 8 another embodiment is shown, wherein different from Fig. 7 the volume flow through the return line 12 of the high pressure pump 10 is limited by a throttle 6 and thus ensures that always a sufficient volume flow through the cooling line 5 reaches the mixing point 23.
- a flow meter 26 is arranged between the fuel injection valves 20 and the mixing point 23 and a temperature sensor 27 at the mixing point 23, with which the flow through the cooling line 5 via the valve 7 is controlled.
- this control can be controlled both via both parameters (flow and temperature) and via one of the two parameters.
- the measuring element for the other measured variable can then be omitted.
- a controllable valve 7 can also be analog Fig. 8 a variable throttle 6 can be used instead of the valve 7.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung bezieht sich auf ein Hochdruck-Einspritzsystem, insbesondere auf ein Hochdruck-Speicher-Einspritzsystem für Brennkraftmaschinen, mit einem Kraftstofftank, aus dem der Kraftstoff über eine Kraftstoffförderpumpe und ein Leitungssystem zur Hochdruckpumpe geleitet wird. Durch die Kompression des Kraftstoffes in der Hochdruckpumpe steigt die Kraftstofftemperatur. Der komprimierte Kraftstoff wird von der Hochdruckpumpe durch eine weitere Leitung in einen Hochdruckspeicher geleitet, der seinerseits wenigstens mit einem Kraftstoff-Einspritzventil verbunden ist. Aus dem Kraftstoff-Einspritzventil wird beim Betrieb der Brennkraftmaschine komprimierter Kraftstoff in einen Brennraum eingespritzt. Ein Teil des dem Kraftstoff-Einspritzventil zugeführten Kraftstoffs gelangt über Leckage im Kraftstoff-Einspritzventil oder als Steuermenge aus dem Kraftstoff-Einspritzventil in die Rücklaufleitung, wobei sich diese Leckagemengen durch das Entspannen beim Durchströmen des Kraftstoff-Einspritzventils zusätzlich erwärmen.The invention relates to a high-pressure injection system, in particular to a high-pressure accumulator injection system for internal combustion engines, with a fuel tank, from which the fuel is passed via a fuel delivery pump and a line system to the high-pressure pump. Due to the compression of the fuel in the high-pressure pump, the fuel temperature rises. The compressed fuel is passed from the high pressure pump through another line in a high-pressure accumulator, which in turn is connected to at least one fuel injection valve. During operation of the internal combustion engine, compressed fuel is injected from the fuel injection valve into a combustion chamber. A portion of the fuel injection valve supplied fuel passes via leakage in the fuel injection valve or as a control amount from the fuel injection valve in the return line, wherein these leakage quantities additionally heat by relaxing when flowing through the fuel injection valve.
Die Erfindung geht von der Erkenntnis aus, dass bei ungünstigen Voraussetzungen (fast leerer Kraftstofftank, kleines Volumen an Kraftstoff, welches häufig im Kreis gepumpt wird) und entsprechenden Lastfällen Betriebszustände eintreten können, in denen der Kraftstoff über eine zulässige Grenztemperatur hinaus erhitzt wird, so dass es zu einer Zersetzung (Alterung) des Kraftstoffes kommt, was zur Reduzierung der Schmiereigenschaften des Kraftstoffes und somit zu erhöhtem mechanischen Verschleiß im System führt. Darüber hinaus sind durch die erhöhten Rücklauftemperaturen ggf. teurere Materialien für die Ausführung der Rücklaufleitungen einzusetzen.The invention is based on the recognition that in unfavorable conditions (almost empty fuel tank, small volume of fuel, which is often pumped in a circle) and corresponding load cases operating conditions may occur in which the fuel is heated above a permissible limit temperature, so that There is a deterioration (aging) of the fuel, which leads to the reduction of the lubricating properties of the fuel and thus to increased mechanical wear in the system. In addition, due to the increased return temperatures possibly more expensive materials for the execution of the return lines to use.
Bei dem z.B. aus
Aus der
Weitere Einspritzsysteme sind in den Dokumenten
Durch die Erfindung gelingt es mit einfachen und kostengünstigen Mitteln, die Nachteile eines ungekühlten Kraftstoffrücklaufs zu reduzieren. Dazu ist eine Kühlleitung zur Beimischung von Kraftstoff aus kühleren Bereichen des Niederdruckbereiches zwischen Kraftstofftank und Hochdruckpumpe vorgesehen, über die dem Kraftstoffrücklauf kühlerer Kraftstoff beigemischt werden kann. Dadurch wird die Kraftstofftemperatur im Rücklauf reduziert, so dass die vorher genannten negativen Effekte nicht mehr oder zumindest nur noch in deutlich reduziertem Umfang auftreten.With the invention, it is possible with simple and inexpensive means to reduce the disadvantages of an uncooled fuel return. For this purpose, a cooling line is provided for admixing fuel from cooler regions of the low-pressure region between the fuel tank and the high-pressure pump, via which cooler fuel can be added to the fuel return. As a result, the fuel temperature is reduced in the return, so that the aforementioned negative effects no longer occur or at least only to a significantly reduced extent.
Ein erstes Ausführungsbeispiel des Kraftstoff-Einspritzsystems ist dadurch gekennzeichnet, dass die Kühlleitung einen zur Kraftstoffkühlung benötigten Volumenstrom zwischen einer Kraftstoffförderpumpe und der Hochdruckpumpe aufnimmt und diesen Volumenstrom zur Kühlung über einen Mischpunkt dem Leckagestrom aus den Kraft-stoff-Einspritzventilen, welche beispielsweise als Common-Rail-Injektoren ausgeführt sein können, zuführt. Durch die Kraftstoffförderpumpe ist stets dafür gesorgt, dass ein Volumenstrom unter ausreichendem Druck zu Kühlzwecken zur Verfügung steht, so dass diese Ausführung ohne weitere Regelmechanismen auskommen kann. Vorteilhaft bei dieser Ausführung ist weiterhin, dass durch die Kraftstoffförderpumpe eine Vorförderpumpe an der Hochdruckpumpe entfallen kann.A first embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling between a fuel pump and the high-pressure pump and this volume flow for cooling via a mixing point the leakage flow from the fuel injectors, which, for example, as a common rail Injectors can be executed. By the fuel pump is always ensured that a volume flow is available under sufficient pressure for cooling purposes, so that this design can do without further control mechanisms. An advantage of this design is further that can be omitted by the fuel pump a prefeed pump on the high-pressure pump.
Ein weiteres Ausführungsbeispiel des Kraftstoff-Einspritzsystems ist dadurch gekennzeichnet, dass die Kühlleitung einen zur Kraftstoffkühlung benötigten Volumenstrom aus der an der Hochdruckpumpe angeordneten Vorförderpumpe aufnimmt und diesen Volumenstrom über einen Mischpunkt dem Leckagestrom aus den Kraftstoff-Einspritzventilen zuführt. Durch die Vorförderpumpe direkt an der Hochdruckpumpe, welche beispielsweise als Zahnradpumpe ausgeführt sein kann, die einen Volumenstrom aus dem Kraftstofftank ansaugt, kann die Kraftstoffförderpumpe entfallen. Vorteilhaft bei dieser Ausführung ist, dass die Kühlleitung entsprechend kurz und somit kostengünstig ausgeführt werden kann.A further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from the prefeed pump arranged on the high-pressure pump and supplies this volume flow via a mixing point to the leakage flow from the fuel injection valves. By the prefeed pump directly to the high-pressure pump, which may for example be designed as a gear pump, which sucks a volume flow from the fuel tank, the fuel pump can be omitted. An advantage of this design is that the cooling line can be made correspondingly short and therefore cost.
Ein weiteres Ausführungsbeispiel des Kraftstoff-Einspritzsystems ist dadurch gekennzeichnet, dass die Kühlleitung direkt aus dem Kraftstofftank an den Mischpunkt mit dem Leckagestrom aus dem Kraftstoff-Einspritzventil führt, wobei in der Rücklaufleitung vom Mischpunkt zurück zum Kraftstofftank beispielsweise ein Saugpumpe angeordnet ist, so dass in der Rücklaufleitung stets ein niedrigerer Druck als in der Kühlleitung herrscht. Vorteilhaft bei dieser Ausführung ist, dass dem Konstrukteur bei der Anordnung der Kühlleitung ein maximaler Freiheitsgrad gegeben ist.A further embodiment of the fuel injection system is characterized in that the cooling line leads directly from the fuel tank to the mixing point with the leakage flow from the fuel injection valve, wherein in the return line from the mixing point back to the fuel tank, for example, a suction pump is arranged so that in the Return line always a lower pressure than in the cooling line prevails. An advantage of this design is that the designer in the arrangement of the cooling line is given a maximum degree of freedom.
Ein weiteres Ausführungsbeispiel des Kraftstoff-Einspritzsystems ist dadurch gekennzeichnet, dass die Kühlleitung einen zur Kraftstoffkühlung benötigten Volumenstrom aus einem Rücklauf der Hochdruckpumpe aufnimmt und diesen Volumenstrom über den Mischpunkt dem Leckagestrom aus dem Kraftstoff-Einspritzventil zuführt. Vorteilhaft bei dieser Ausführung ist, dass die Rücklaufmenge aus der Hochdruckpumpe einen vergleichsweise großen Volumenstrom liefert. Konstruktiv kann dabei eine vorhandene Rücklaufleitung aus der Hochdruckpumpe so angeordnet werden, dass sie den Rücklauf mit dem Mischpunkt verbindet, so dass keine zusätzlichen Bauelemente benötigt werden.A further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from a return of the high-pressure pump and supplies this volume flow via the mixing point to the leakage flow from the fuel injection valve. An advantage of this design is that the return flow from the high-pressure pump delivers a comparatively large volume flow. Constructively, an existing return line from the high pressure pump can be arranged so that it connects the return to the mixing point, so that no additional components are needed.
Erfindungsgemäß ist der Mischpunkt, an dem die Kühlleitung und die Leckage aus den Kraftstoff-Einspritzventilen zusammentreffen, möglichst dicht am Kraftstoff-Einspritzventil angeordnet. Vorteilhaft bei dieser Ausführung ist, dass durch die kurze Wegstrecke zwischen Kraftstoff-Einspritzventil und Mischpunkt die Verweildauer und das Volumen im Leitungssystem, in dem der Kraftstoff einer kritischen Temperatur ausgesetzt ist, möglichst klein gehalten wird und somit die damit verbundenen Risiken entsprechend reduziert werden.According to the invention, the mixing point at which the cooling line and the leakage from the fuel injection valves meet, arranged as close as possible to the fuel injection valve. An advantage of this embodiment is that the residence time and the volume in the line system, in which the fuel is at a critical temperature, are due to the short distance between the fuel injection valve and the mixing point is kept as small as possible and thus the associated risks are reduced accordingly.
Ein weiteres Ausführungsbeispiel des Kraftstoff-Einspritzsystems ist dadurch gekennzeichnet, dass die Kühlleitung einen zur Kraftstoffkühlung benötigten Volumenstrom aus einer Rücklaufleitung der Hochdruckpumpe aufnimmt und dieser Volumenstrom über eine Drossel oder ein Ventil so geteilt werden kann, dass eine Teilmenge des Volumenstroms zur Kühlung durch die Kühlleitung an den Mischpunkt geleitet wird und eine weitere Teilmenge direkt über die Rücklaufleitung der Hochdruckpumpe mit dem Kraftstoffrücklauf zum Kraftstofftank verbunden ist.
Vorteilhaft bei dieser Ausführung ist, dass der zur Kühlung benutzte Volumenstrom durch die Kühlleitung entsprechend geregelt werden kann.A further exemplary embodiment of the fuel injection system is characterized in that the cooling line receives a volume flow required for fuel cooling from a return line of the high-pressure pump and this volume flow can be divided via a throttle or a valve so that a subset of the volume flow for cooling through the cooling line the mixing point is passed and another subset is connected directly via the return line of the high-pressure pump with the fuel return to the fuel tank.
An advantage of this design is that the volume flow used for cooling can be regulated by the cooling line accordingly.
Ein weiteres Ausführungsbeispiel des Kraftstoff-Einspritzsystems ist dadurch gekennzeichnet, dass am Mischpunkt ein Sensor zur Temperaturmessung oder ein Sensor zur Durchflussmessung angeordnet ist, so dass der Volumenstrom durch die Kühlleitung beispielsweise durch eine verstellbare Drossel oder ein Ventil derart geregelt werden können, dass stets ein zur Kühlung ausreichender Volumenstrom durch die Kühlleitung an den Mischpunkt zugeführt wird. Diese Ausführung hat den Vorteil, dass gerade bei niedrigeren Systemtemperaturen kein unnötig hoher Volumenstrom durch die Kühlleitung gefördert wird und somit der Gesamtwirkungsgrad des Systems nicht unnötig reduziert wird.Another embodiment of the fuel injection system is characterized in that a sensor for measuring temperature or a sensor for flow measurement is arranged at the mixing point, so that the volume flow through the cooling line, for example by an adjustable throttle or a valve can be controlled such that always a for Cooling sufficient volume flow through the cooling line is fed to the mixing point. This embodiment has the advantage that, especially at lower system temperatures, no unnecessarily high volume flow is conveyed through the cooling line and thus the overall efficiency of the system is not unnecessarily reduced.
In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt, die nachstehend detailliert beschrieben werden:
Es zeigt:
- Fig. 1
- eine schematische Darstellung eines Kraftstoff-Einspritzsystems gemäß dem Stand der Technik
- Fig. 2
- ein erstes Ausführungsbeispiel des erfindungsgemäßen Kraftstoff-Einspritzsystems.
- Fig. 3 bis 9
- weitere Ausführungsbeispiele des erfindungsgemäßen Kraftstoff-Einspritzsystems in schematischer Darstellung.
It shows:
- Fig. 1
- a schematic representation of a fuel injection system according to the prior art
- Fig. 2
- a first embodiment of the fuel injection system according to the invention.
- Fig. 3 to 9
- further embodiments of the fuel injection system according to the invention in a schematic representation.
In
An der Hochdruckpumpe 10 ist ein Kraftstoffrücklauf 11 angeordnet, welcher über eine Rücklaufleitung 12 und eine weitere Rücklaufleitung 22 mit dem Kraftstofftank 1 verbunden ist. Außerdem führt von der Hochdruckpumpe 10 eine Hochdruckleitungen 13 zu einem Hochdruckspeicher 14, der auch als Common-Rail bezeichnet wird, welcher über weitere Hochdruckleitungen 15 mit den Kraftstoffeinspritzventilen 20 verbunden ist. Dabei ist das Vorhandensein eines Hochdruckspeichers 14 nicht zwangsläufig erforderlich.
Zum Betrieb einer (nicht dargestellten) Brennkraftmaschine wird der von der Hochdruckpumpe 10 komprimierte Kraftstoff durch das Öffnen der Kraftstoff-Einspritzventile 20 in einen Brennraum eingespritzt. Ein Teil des dem Kraftstoff-Einspritzventil 20 zugeführten Kraftstoffes wird im Kraftstoff-Einspritzventil 20 entspannt und gelangt als Steuermenge oder als Leckagemenge in die Rücklaufleitung 21, welche das Kraftstoff-Einspritzventil 20, ggf. über eine weitere Rücklaufleitung 22, mit dem in Absatz 1 beschriebenen Niederdruckbereich, insbesondere mit dem Kraftstofftank 1 verbindet. Die Flussrichtung des Kraftstoffes ist in der schematischen Zeichnung jeweils durch Pfeile neben den entsprechenden Leitungen dargestellt.At the high-
For operating an internal combustion engine (not shown), the fuel compressed by the high-
An dem Hochdruckspeicher 14 ist ein Druckbegrenzungsventil 16 angeordnet, welches über die Rücklaufleitung 17 mit einem Mischpunkt 24 verbunden ist, an dem sich die Volumenströme aus der Rücklaufleitung 17 aus dem Druckbegrenzungsventil 16 und der Rücklaufleitung 21 aus den Kraftstoff-Einspritzventil 20 treffen und von wo aus dieser Volumenstrom über eine weitere Rücklaufleitung 22 in den Kraftstofftank 1 gelangt. Steigt der Druck im Hochdruckspeicher 14 über einen maximal vorgegebenen Wert, dann öffnet das Druckbegrenzungsventil 16 und der Überdruck im Hochdruckspeicher 14 wird durch das Absteuern von Kraftstoff in die Rücklaufleitung 17 abgebaut.At the high-
Gemäß der vorliegenden Erfindung wird mit Hilfe einer Kühlleitung kühlerer Kraftstoff aus dem Niederdruckbereich der Leckagemenge aus dem Kraftstoff-Einspritzventil beigemischt um die Temperaturen in den Rücklaufleitungen 21 und 22 zu reduzieren.According to the present invention, cooler fuel from the low-pressure region is mixed with the leakage amount from the fuel injection valve by means of a cooling line to reduce the temperatures in the
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Claims (9)
- High pressure injection system having a fuel tank (1), a connection line (2, 3, 4) between the fuel tank (1) and a high pressure pump (10) for compressing the fuel, wherein the high pressure pump (10) is connected via a corresponding connection line (13, 14, 15) to at least one fuel injection valve (20), from which at least a partial quantity of the fuel compressed in the high pressure pump (10) is fed back into the fuel tank (1) via a return line (21, 22) connected to the fuel tank (1), through leakage in the fuel injection valve (20), characterized in that the high pressure injection system has a cooling line (5) that connects the fuel tank (1) or the connection line (2, 3, 4) or a return (11) of the high pressure pump (10) to the return line (21, 22) via a mixing point (23) wherein the mixing point (23), at which the cooling line (5) and the leakage flow from the fuel injection valve (20) meet, is arranged as close as possible to the fuel injection valve (20), in order to keep the distance in which the fuel exceeds a critical temperature as small as possible.
- High pressure injection system according to Claim 1, characterized in that a connection line (2, 3, 4) contains a fuel feed pump (2), wherein the cooling line (5) is connected at one end to the connection line (2, 3, 4) between the tank-side pre-feed pump (2) and the high pressure pump (10) and is connected at the other end to the mixing point (23).
- High pressure injection system according to Claim 1, characterized in that a cooling line (5) leads from a pre-feed pump (4), which forms one element of the connection line (2, 3, 4) and which puts the fuel under pressure, to a mixing point (23).
- High pressure injection system according to Claim 1, characterized in that the connection lines (13, 14, 15) have at least the following components:• a high pressure reservoir (14)• a pressure limiting valve (16) for pressure reduction at the high pressure reservoir (14),
wherein there is a return line (17) from the pressure limiting valve (16), wherein said return line (17) is connected at one end to the pressure limiting valve (16) at the high pressure reservoir (14) and is connected at the other end either directly to the mixing point (23) or, via another mixing point (24), to the return line (21, 22). - High pressure injection system according to Claim 1, characterized in that at least one of the following components is arranged in the return line (12) between the high pressure pump (10) and the mixing point (23):• a restrictor (6)• a valve (7),
wherein the component (6, 7) is suitable for directing at least a partial quantity of the volume flow out of the return (11) from the high pressure pump (10) or out of a return line (12) from the high pressure pump (10) into the cooling line (5) between said component (6, 7) and the mixing point (23). - High pressure injection system according to Claim 1, characterized in that a vacuum pump (25) for producing a vacuum in the return line (21, 22) is arranged in the return line (21, 22) between the mixing point (23) and the fuel tank (1).
- High pressure injection system according to Claim 5, characterized in that a flow meter (26) is arranged between the high pressure injection valve (20) and the mixing point (23), or a temperature sensor (27) is arranged at the mixing point (23), being used to control the valve (7) or the restrictor (6) in such a way that the flow rate through the cooling line (5) is regulated.
- Method for operating a high pressure injection system having a fuel tank (1), a connection line (2, 3, 4) between the fuel tank (1) and a high pressure pump (10) for compressing the fuel, wherein the high pressure pump (10) is connected via a corresponding connection line (13, 14, 15) to at least one fuel injection valve (20), from which at least a partial quantity of the fuel compressed in the high pressure pump (10) is fed back into the fuel tank (1) via a return line (21, 22) connected to the fuel tank (1), through leakage in the fuel injection valve (20), and having a cooling line (5) that connects the fuel tank (1) or the connection line (2, 3, 4) or a return (11) of the high pressure pump (10) to the return line (21, 22) via a mixing point (23), characterized in that the mixing point (23), at which the cooling line (5) and the leakage flow from the fuel injection valve (20) meet, is arranged as close as possible to the fuel injection valve (20), in order to keep the distance in which the fuel exceeds a critical temperature as small as possible, and in that a higher pressure is maintained in the cooling line (5) than in the return line (21, 22) at all times and the temperature in the cooling line (5) is lower than the temperature of the leakage quantity from the fuel injection valve (20), with the result that the temperature in the return line (21, 22) is reduced by the addition of the cooler fuel from the cooling line (5) at the mixing point (23).
- Method for operating a high pressure injection system according to Claim 8, characterized in that the volume flow fed to the mixing point (23) via the cooling line (5) is sufficient to achieve a cooling effect on the leakage from the fuel injection valve (20) in the return line (21, 22).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009028023A DE102009028023A1 (en) | 2009-07-27 | 2009-07-27 | High pressure injection system with fuel cooling from low pressure range |
PCT/EP2010/057966 WO2011012363A1 (en) | 2009-07-27 | 2010-06-08 | High pressure injection system having fuel cooling from low pressure region |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2459865A1 EP2459865A1 (en) | 2012-06-06 |
EP2459865B1 true EP2459865B1 (en) | 2015-03-04 |
Family
ID=42543482
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10722121.0A Not-in-force EP2459865B1 (en) | 2009-07-27 | 2010-06-08 | High pressure injection system having fuel cooling from low pressure region |
Country Status (6)
Country | Link |
---|---|
US (1) | US20120118268A1 (en) |
EP (1) | EP2459865B1 (en) |
JP (1) | JP2013500429A (en) |
CN (1) | CN102472217B (en) |
DE (1) | DE102009028023A1 (en) |
WO (1) | WO2011012363A1 (en) |
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-
2009
- 2009-07-27 DE DE102009028023A patent/DE102009028023A1/en not_active Withdrawn
-
2010
- 2010-06-08 JP JP2012522053A patent/JP2013500429A/en active Pending
- 2010-06-08 WO PCT/EP2010/057966 patent/WO2011012363A1/en active Application Filing
- 2010-06-08 EP EP10722121.0A patent/EP2459865B1/en not_active Not-in-force
- 2010-06-08 CN CN201080032715.5A patent/CN102472217B/en not_active Expired - Fee Related
- 2010-06-08 US US13/384,618 patent/US20120118268A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO2011012363A1 (en) | 2011-02-03 |
CN102472217A (en) | 2012-05-23 |
JP2013500429A (en) | 2013-01-07 |
CN102472217B (en) | 2014-07-09 |
DE102009028023A1 (en) | 2011-02-03 |
EP2459865A1 (en) | 2012-06-06 |
US20120118268A1 (en) | 2012-05-17 |
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