EP1326020B1 - Fuel supply device for internal combustion engines - Google Patents

Fuel supply device for internal combustion engines Download PDF

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Publication number
EP1326020B1
EP1326020B1 EP20020027602 EP02027602A EP1326020B1 EP 1326020 B1 EP1326020 B1 EP 1326020B1 EP 20020027602 EP20020027602 EP 20020027602 EP 02027602 A EP02027602 A EP 02027602A EP 1326020 B1 EP1326020 B1 EP 1326020B1
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Prior art keywords
fuel
fact
feeding device
tank
pressure generator
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German (de)
French (fr)
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EP1326020A3 (en
EP1326020A2 (en
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Georg Gruber
Alois Dotzer
Thomas Kaiser
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • 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
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/54—Arrangement of fuel pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons

Definitions

  • the invention relates to a fuel supply device for internal combustion engines according to the preamble of claim 1.
  • a fuel supply is described, which is specially adapted to the use of a distributor pump.
  • the fuel is pumped out of the tank by an intake pump integrated in the distributor pump and fed to the actual high-pressure pump. This compresses the fuel and distributes it to the individual cylinders.
  • excess fuel from the distributor pump is immediately returned to the pump inlet via a circulation line. This already compressed and warmed fuel mixes here with a small amount of cold fuel from the tank.
  • compressor systems are used for fuel injection, which compress the fuel to over 1000 bar. These systems are prone to overheating and must therefore be constantly cooled.
  • the necessary cooling is usually realized in that a backing pump promotes a multiple of the fuel required by the high-pressure pump. The excess dissipates the heat from the high pressure pump and is returned to the tank.
  • Such high-pressure pumps have worked well during normal operation and has reached a sufficient service life in the meantime. After a change of the fuel filter resulted in the resumption of the operation an increased damage rate. The resumption of operations resulted in an increased loss ratio.
  • a fuel supply device for internal combustion engines having the characterizing features of claim 1. It has been found that, in particular after a fuel filter change, small amounts of air remain in the system. If these air bubbles enter the high-pressure part, lubrication stops for a short time and local thermal overload occurs. In the exact fits of these high-pressure parts, this leads very quickly to destruction.
  • Fine air bubbles in the fuel delivery system may also be caused by improper hose connections, unscrewed screws, marten bites in hoses or other leaks.
  • such bubbles are very difficult to remove from tough, low-viscosity fuels.
  • the fuel tank running empty leads to the same phenomena. In all these cases, it can lead to significant damage to the high-pressure pump or even to their destruction.
  • the fuel buffer with gas separation function is provided directly in front of the high pressure generator and after the fuel filter. In this way, all air pockets, including those that are caused by a filter change, are removed.
  • a line emanating from the fuel filter also opens into the upper area of the intermediate fuel reservoir.
  • the possibly mixed with air fuel remains until its segregation due to its lower specific gravity in this upper range, while the air-freed, heavy, pure fuel in the lower portion of the fuel reservoir decreases.
  • From this lower area of the fuel is withdrawn and fed to the high pressure generator.
  • a throttle and a pressure relief valve for the return of excess and possibly too hot fuel via a return line into the tank are provided at the upper end of the intermediate fuel reservoir.
  • a level sensor is provided in the fuel buffer. This level sensor advantageously generates an alarm signal when the fuel level in the fuel buffer falls below a predetermined minimum.
  • this sensor switches off the internal combustion engine.
  • FIGURE shows a schematic representation of the fuel supply device according to the invention.
  • a vane pump is integrated, which should ensure the reliable filling of the radial piston and promotes a multiple of the injection quantity required for the injection.
  • This fuel delivered in excess serves to cool the pump and is returned via the line 10 to the upper region of the intermediate fuel reservoir 5.
  • the intermediate fuel accumulator 5 quickly fills with fuel that is not yet too warm and therefore relatively viscous.
  • the Throttle 6 is designed so that under these operating conditions quickly builds up a high pressure in the intermediate fuel tank, which ensures that sufficient amount of fuel enters the injection pump 9.
  • the passage through the throttle 6 also increases. As a result, the pressure applied to the overpressure valve 7 increases again. If this pressure reaches a predetermined value as a result of further heating of the fuel, the pressure relief valve opens and releases the return flow into the tank via the line 8.
  • the penetration of air into the fuel supply system can not be avoided. If the internal combustion engine is then put back into operation, the trapped air is gradually pressed by the nachschiebenden fuel in the fuel reservoir 5. There, the air remains in the upper region, while the liquid fuel drops to the lower region. Both air bubbles and fuel-air mixture in the upper region of the fuel reservoir 5 are returned at a corresponding overpressure through the throttle 6, the pressure relief valve 7 and the return line 8 in the tank. In this way it is ensured that the injection pump 9 is always fed only air-free fuel from the lower region of the intermediate fuel reservoir.
  • a second sensor 15 is provided which shuts off the engine in good time before air enters the supply line 11 to the high-pressure generator 9.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Description

Die Erfindung geht aus von einer Kraftstoffzuführeinrichtung für Brennkraftmaschinen nach dem Oberbegriff von Anspruch 1.The invention relates to a fuel supply device for internal combustion engines according to the preamble of claim 1.

In der DE 197 36 283 A1 ist eine Kraftstoffversorgung beschrieben, die speziell auf die Verwendung einer Verteilerpumpe abgestimmt ist. Der Kraftstoff wird bei diesem Versorgungssystem von einer in der Verteilerpumpe integrierten Ansaugpumpe aus dem Tank gefördert und der eigentlichen Hochdruckpumpe zugeführt. Diese verdichtet den Kraftstoff und verteilt ihn auf die einzelnen Zylinder. Um auch nach einem Kaltstart sehr schnell vorgewärmten Kraftstoff zur Verfügung zu haben, wird überschüssiger Kraftstoff von der Verteilerpumpe über eine Zirkulationsleitung sofort wieder dem Pumpeneinlauf zur Verfügung gestellt. Dieser bereits einmal verdichtete und angewärmte Kraftstoff mischt sich hier mit einem geringen Anteil an kaltem Kraftstoff aus dem Tank.In DE 197 36 283 A1 a fuel supply is described, which is specially adapted to the use of a distributor pump. In this supply system, the fuel is pumped out of the tank by an intake pump integrated in the distributor pump and fed to the actual high-pressure pump. This compresses the fuel and distributes it to the individual cylinders. In order to have very quickly preheated fuel available even after a cold start, excess fuel from the distributor pump is immediately returned to the pump inlet via a circulation line. This already compressed and warmed fuel mixes here with a small amount of cold fuel from the tank.

Aus der US-A-6.112.725 geht ein Kraftstoffversorgungssystem hervor, welches hauptsächlich in benzingetriebenen Bootsmotoren zum Einsatz kommt. Die Hochdruckpumpe ist in einem Kraftstoffvorratsbehälter untergebracht, der insbesondere der Entdampfung des Kraftstoffes dient, bevor dieser der Hochdruckpumpe zugeführt wird.From US-A-6,112,725 a fuel supply system emerges, which is mainly used in petrol-powered marine engines. The high pressure pump is housed in a fuel tank, which is used in particular for the devolatilization of the fuel before it is fed to the high pressure pump.

Neuerdings werden für die Kraftstoffeinspritzung Verdichtersysteme verwendet, die den Kraftstoff auf über 1000 bar verdichten. Diese Systeme neigen stark zur Überhitzung und müssen daher ständig gekühlt werden. Die notwendige Kühlung wird üblicherweise dadurch realisiert, dass eine Vorpumpe ein Vielfaches des von der Hochdruckpumpe benötigten Kraftstoffs fördert. Der Überschuß führt die Wärme aus der Hochdruckpumpe ab und wird wieder dem Tank zugeführt. Solche Hochdruckpumpen haben sich bei bestimmungsgemäßem Betrieb gut bewährt und zwischenzeitlich eine ausreichende Standzeit erreicht. Nach einem Wechsel der Kraftstofffilter ergab sich bei der Wiederaufnahme des Betriebes eine erhöhte Schadensquote. ergab sich bei der Wiederaufnahme des Betriebes eine erhöhte Schadensquote.Recently, compressor systems are used for fuel injection, which compress the fuel to over 1000 bar. These systems are prone to overheating and must therefore be constantly cooled. The necessary cooling is usually realized in that a backing pump promotes a multiple of the fuel required by the high-pressure pump. The excess dissipates the heat from the high pressure pump and is returned to the tank. Such high-pressure pumps have worked well during normal operation and has reached a sufficient service life in the meantime. After a change of the fuel filter resulted in the resumption of the operation an increased damage rate. The resumption of operations resulted in an increased loss ratio.

Es war daher die Aufgabe der Erfindung, eine Kraftstoffzuführeinrichtung so auszugestalten, dass solche Hochdruckverteilerpumpen mit großer Sicherheit unter allen bei normalem Gebrauch vorkommenden Bedingungen, auch nach einem Filterwechsel, betrieben werden können.It was therefore the object of the invention to design a fuel supply device such that such high-pressure distributor pumps can be operated with great certainty under all conditions occurring under normal use, even after a filter change.

Gelöst wird die Aufgabe durch eine Kraftstoffzuführeinrichtung für Brennkraftmaschinen mit den kennzeichnenden Merkmalen von Anspruch 1. Es wurde herausgefunden, dass insbesondere nach einem Kraftstofffilterwechsel geringe Mengen von Luft im System verbleiben. Kommen diese Luftblasen in den Hochdruckteil, so setzt für kurze Zeit die Schmierung aus und es kommt zu einer lokalen thermischen Überlastung. Bei den genauen Passungen dieser Hochdruckteile führt dies sehr schnell zu Zerstörungen.The object is achieved by a fuel supply device for internal combustion engines having the characterizing features of claim 1. It has been found that, in particular after a fuel filter change, small amounts of air remain in the system. If these air bubbles enter the high-pressure part, lubrication stops for a short time and local thermal overload occurs. In the exact fits of these high-pressure parts, this leads very quickly to destruction.

Feine Luftblasen im Kraftstoffzuführungssystem können auch durch nicht ordnungsgemäße Schlauchverbindungen, nicht fest gezogene Schrauben, durch Marderbisse in Schläuchen oder durch andere Leckagen verursacht werden. Insbesondere lassen sich solche Luftblasen sehr schwer aus zähen, niedrigviskosen Kraftstoffen entfernen. Auch das Leerfahren des Kraftstofftankes führt zu dem gleichen Phänomenen. In all diesen Fällen kann es zu erheblichen Schäden an der Hochdruckpumpe oder sogar zu deren Zerstörung kommen.Fine air bubbles in the fuel delivery system may also be caused by improper hose connections, unscrewed screws, marten bites in hoses or other leaks. In particular, such bubbles are very difficult to remove from tough, low-viscosity fuels. Also, the fuel tank running empty leads to the same phenomena. In all these cases, it can lead to significant damage to the high-pressure pump or even to their destruction.

Durch die Entnahme des Kraftstoffes aus einem Kraftstoffzwischenspeicher mit Gasabscheidefunktion, der der Hochdruckpumpe zugeführt wird, kann dies sicher verhindert werden. Sobald Luftblasen aus einem der oben aufgeführten Gründe im Kraftstoff vorhanden sind, werden diese in dem Kraftstoffzwischenspeicher mit Gasabscheidefunktion von dem flüssigen Kraftstoff separiert und nur der reine Kraftstoff der Hochdruckpumpe zugeführt.By removing the fuel from a fuel reservoir with gas separation function, which is supplied to the high pressure pump, this can be safely prevented. As soon as air bubbles are present in the fuel for one of the reasons listed above, they are entrained in the fuel buffer Gas separation function separated from the liquid fuel and fed only the pure fuel of the high-pressure pump.

Vorteilhafterweise ist der Kraftstoffzwischenspeicher mit Gasabscheidefunktion direkt vor dem Hochdruckerzeuger und nach dem Kraftstofffilter vorgesehen. Auf diese Weise können sämtliche Lufteinschlüsse, auch die, die durch einen Filterwechsel bedingt sind, entfernt werden.Advantageously, the fuel buffer with gas separation function is provided directly in front of the high pressure generator and after the fuel filter. In this way, all air pockets, including those that are caused by a filter change, are removed.

Der für die Kühlung der Pumpe zuviel geförderter Kraftstoff ist bereits vorgewärmt und soll insbesondere für den Kaltstartvorgang - anstatt ungenutzt an den Tank zurückzufließen - dem Hochdruckerzeuger wieder zur Verfügung stehen. Dieser Kraftstoff wird deshalb in den oberen Bereich des Kraftstoffzwischenspeichers eingeleitet.The fuel pumped too much for the cooling of the pump is already preheated and should be available to the high-pressure generator again, in particular for the cold start procedure - instead of flowing back to the tank unused. This fuel is therefore introduced into the upper area of the intermediate fuel storage.

Eine von dem Kraftstofffilter ausgehende Leitung mündet ebenfalls in den oberen Bereich des Kraftstoffzwischenspeichers. Der eventuell mit Luft vermischte Kraftstoff verbleibt bis zu seiner Entmischung aufgrund seines geringeren spezifischen Gewichtes in diesem oberen Bereich, während der von Luft befreite, schwere, reine Kraftstoff in dem unteren Bereich des Kraftstoffzwischenspeichers absinkt. Aus diesem unteren Bereich wird der Kraftstoff abgezogen und dem Hochdruckerzeuger zugeführt. Eine Drossel und ein Überdruckventil für die Rückführung von überschüssigem und möglicherweise zu heißem Kraftstoff über eine Rücklaufleitung in den Tank sind am oberen Ende des Kraftstoffzwischenspeichers vorgesehen. Um die Zuführung von Luft zu dem Hochdruckerzeuger unter allen Betriebsbedingungen zu vermeiden, ist in dem Kraftstoffzwischenspeicher ein Niveausensor vorgesehen. Dieser Niveausensor erzeugt in vorteilhafter Weise ein Alarmsignal, wenn der Kraftstoffstand in dem Kraftstoffzwischenspeicher ein vorgegebenes Minimum unterschreitet.A line emanating from the fuel filter also opens into the upper area of the intermediate fuel reservoir. The possibly mixed with air fuel remains until its segregation due to its lower specific gravity in this upper range, while the air-freed, heavy, pure fuel in the lower portion of the fuel reservoir decreases. From this lower area of the fuel is withdrawn and fed to the high pressure generator. A throttle and a pressure relief valve for the return of excess and possibly too hot fuel via a return line into the tank are provided at the upper end of the intermediate fuel reservoir. In order to avoid the supply of air to the high pressure generator under all operating conditions, a level sensor is provided in the fuel buffer. This level sensor advantageously generates an alarm signal when the fuel level in the fuel buffer falls below a predetermined minimum.

Um Schäden mit Sicherheit vermeiden zu können, schaltet dieser Sensor aber die Brennkraftmaschine ab. Selbstverständlich besteht auch die Möglichkeit bei einem ersten Kraftstoffniveau ein Alarmsignal auszulösen und erst bei einem zweiten minimalen Kraftstoffniveau die Brennkraftmaschine abzuschalten. Durch diese Maßnahmen wird sogar verhindert, dass bei einem Leerfahren des Tankes Luft in den Hochdruckerzeuger gelangt und diesen beschädigt oder zerstört.To be able to avoid damage with certainty, however, this sensor switches off the internal combustion engine. Of course, it is also possible to trigger an alarm signal at a first fuel level and to shut off the engine only at a second minimum fuel level. These measures even prevent air from entering the high-pressure generator when the tank is emptying and damaging or destroying it.

Weitere Vorteile der Erfindung ergeben sich aus den Unteransprüchen und werden anhand eines Ausführungsbeispieles eingehend erläutert.Further advantages of the invention will become apparent from the dependent claims and will be explained in detail with reference to an embodiment.

Die einzige Figur zeigt eine schematische Darstellung der erfindungsgemäßen Kraftstoffzuführeinrichtung. Eine Kraftstoffleitung 13, deren offenes Ende im unteren Bereich des Kraftstofftankes 1 mit einem Vorfilter 12 abgedeckt ist, steht mit der Kraftstoffförderpumpe 2 in Verbindung. Diese fördert den angesaugten Kraftstoff durch den Kraftstoffvorwärmer 3 und drückt ihn durch einen Kraftstofffeinstfilter 4. Von dort wird er dem oberen Bereich des Kraftstoffzwischenspeichers 5 zugeführt. Im unteren Bereich des Kraftstoffzwischenspeichers 5 wird der Kraftstoff wieder entnommen und über die Leitung 11 einem Hochdruckerzeuger 9, hier einer Radialkolbenhochdruckverteilereinspritzpumpe zugeführt.The single FIGURE shows a schematic representation of the fuel supply device according to the invention. A fuel line 13, whose open end is covered in the lower region of the fuel tank 1 with a pre-filter 12, communicates with the fuel delivery pump 2 in connection. This promotes the sucked fuel through the fuel preheater 3 and pushes it through a fuel fine filter 4. From there it is fed to the upper region of the intermediate fuel reservoir 5. In the lower region of the intermediate fuel reservoir 5, the fuel is removed again and fed via the line 11 to a high-pressure generator 9, here a radial piston high-pressure distributor injection pump.

In Pumpen dieser Bauart ist eine Flügelpumpe integriert, die für die sichere Befüllung der Radialkolben sorgen soll und ein Vielfaches der für die Einspritzung benötigten Einspritzmenge fördert. Dieser im Überschuß geförderte Kraftstoff dient der Kühlung der Pumpe und wird über die Leitung 10 in den oberen Bereich des Kraftstoffzwischenspeichers 5 zurückgeführt.In pumps of this type, a vane pump is integrated, which should ensure the reliable filling of the radial piston and promotes a multiple of the injection quantity required for the injection. This fuel delivered in excess serves to cool the pump and is returned via the line 10 to the upper region of the intermediate fuel reservoir 5.

Wird nun die nicht gezeigte Brennkraftmaschine bei niedriger Außentemperatur gestartet, füllt sich der Kraftstoffzwischenspeichers 5 schnell mit noch nicht allzu warmem und daher relativ zähem Kraftstoff. Die Drossel 6 ist so ausgelegt, dass sich bei diesen Betriebsbedingungen schnell ein hoher Druck in dem Kraftstoffzwischenspeicher aufbaut, der sicherstellt, dass Kraftstoff in genügender Menge in die Einspritzpumpe 9 gelangt.If the internal combustion engine (not shown) is now started at a low outside temperature, the intermediate fuel accumulator 5 quickly fills with fuel that is not yet too warm and therefore relatively viscous. The Throttle 6 is designed so that under these operating conditions quickly builds up a high pressure in the intermediate fuel tank, which ensures that sufficient amount of fuel enters the injection pump 9.

Wärmt sich nun der Kraftstoff in dem Kraftstoffzwischenspeicher durch die Zirkulation über die Rücklaufleitung 10 auf und wird dadurch dünnflüssiger, so erhöht sich auch der Durchtritt durch die Drossel 6. Dadurch steigt wiederum der an dem Überdruckventil 7 anliegende Druck. Erreicht dieser Druck durch weitere Erwärmung des Kraftstoffes einen vorbestimmten Wert, so öffnet das Überdruckventil und gibt über die Leitung 8 den Rücklauf in den Tank frei.If the fuel now heats up in the intermediate fuel reservoir through the circulation via the return line 10 and becomes less viscous, the passage through the throttle 6 also increases. As a result, the pressure applied to the overpressure valve 7 increases again. If this pressure reaches a predetermined value as a result of further heating of the fuel, the pressure relief valve opens and releases the return flow into the tank via the line 8.

Wird nun beispielsweise der Kraftstofffeinstfilter 4 ausgetauscht, so ist das Eindringen von Luft in das Kraftstoffzuführsystem nicht zu vermeiden. Wird die Brennkraftmaschine danach wieder in Betrieb gesetzt, so wird die eingeschlossene Luft durch den nachschiebenden Kraftstoff allmählich in den Kraftstoffzwischenspeicher 5 gedrückt. Dort verbleibt die Luft in dem oberen Bereich, während der flüssige Kraftstoff in den unteren Bereich absinkt. Sowohl Luftblasen als auch Kraftstoff-Luft-Gemisch im oberen Bereich des Kraftstoffzwischenspeichers 5 werden bei entsprechendem Überdruck durch die Drossel 6, das Überdruckventil 7 und die Rücklaufleitung 8 in den Tank zurückgeführt. Auf diese Weise ist sichergestellt, dass der Einspritzpumpe 9 immer nur luftfreier Kraftstoff aus dem unteren Bereich des Kraftstoffzwischenspeichers zugeführt wird.If, for example, the fuel fine filter 4 is exchanged, the penetration of air into the fuel supply system can not be avoided. If the internal combustion engine is then put back into operation, the trapped air is gradually pressed by the nachschiebenden fuel in the fuel reservoir 5. There, the air remains in the upper region, while the liquid fuel drops to the lower region. Both air bubbles and fuel-air mixture in the upper region of the fuel reservoir 5 are returned at a corresponding overpressure through the throttle 6, the pressure relief valve 7 and the return line 8 in the tank. In this way it is ensured that the injection pump 9 is always fed only air-free fuel from the lower region of the intermediate fuel reservoir.

Sollte sich in dem System eine undichte Stelle befinden, durch die ständig Luft angesaugt wird oder sollte der Tank 1 leer sein, senkt sich das Niveau des luftfreien, flüssigen Kraftstoffes in dem Kraftstoffzwischenspeicher 5 immer weiter ab. Erreicht das Niveau den Sensor 14, so wird ein Alarmsignal generiert, das eine Bedienperson oder einen Fahrer auffordert, die Brennkraftmaschine zu stoppen und schnellstmöglich eine Reparatur einzuleiten. Wird dieses Alarmsignal zusammen mit einer Tank-leer-Anzeige generiert, so ist schnellstmöglich für das Nachtanken zu sorgen.Should there be a leak in the system that constantly draws in air, or should the tank 1 be empty, the level of the air-free, liquid fuel in the intermediate fuel reservoir 5 will continue to decrease. When the level reaches the sensor 14, an alarm signal is generated which prompts an operator or a driver to stop the engine and initiate a repair as soon as possible. Will this alarm signal Generated together with a tank empty display, it is necessary to ensure the refueling as soon as possible.

Wird auf das Alarmsignal nicht reagiert und das Kraftstoffniveau in dem Kraftstoffzwischenspeicher 5 sinkt weiter ab, ist ein zweiter Sensor 15 vorgesehen, der rechtzeitig vor einem Eindringen von Luft in die Zuleitung 11 zum Hochdruckerzeuger 9 die Brennkraftmaschine abschaltet. Dadurch läßt sich sowohl bei einer kompletten Tankentleerung als auch bei einer Beschädigung des Kraftstoffzuführsystems sicher ein Eindringen von Luft in den Hochdruckerzeuger und damit eine Beschädigung oder Zerstörung desselben verhindert.If the alarm signal is not reacted and the fuel level in the intermediate fuel store 5 continues to drop, a second sensor 15 is provided which shuts off the engine in good time before air enters the supply line 11 to the high-pressure generator 9. As a result, both in a complete emptying of the tank as well as damage to the Kraftstoffzuführsystems safely prevents the ingress of air into the high pressure generator and thus damage or destruction thereof.

Claims (10)

  1. Fuel feeding device for internal combustion engines with a fuel storage tank (1) with a fuel filter (4) with a fuel return line (8) into the fuel storage tank (1) and a high-pressure generator (9) upstream of which there is an intermediate fuel tank (5) with gas separation function connected, characterized by the fact that the high-pressure generator (9) compresses the fuel to at least 1000 bar and that there is a level sensor (14, 15) provided in the intermediate fuel tank (5).
  2. Fuel feeding device according to claim 1, characterized by the fact that the intermediate fuel tank (5) is provided between the fuel filter (4) and high-pressure generator (9).
  3. Fuel feeding device according to claim 1, characterized by the fact that a return line (10) of the high-pressure generator (9) opens into the upper area of the intermediate fuel tank (5).
  4. Fuel feeding device according to claim 1, characterized by the fact that a pipe from the fuel filter (4) opens in the upper area of the intermediate fuel tank (5).
  5. Fuel feeding device according to claim 1, characterized by the fact that fuel is fed to the high-pressure generator (9) from the lower area of the intermediate fuel tank (5).
  6. Fuel feeding device according to claim 1, characterized by the fact that a return line into the tank (1) opens in the upper area of the intermediate fuel tank (5).
  7. Fuel feeding device according to claim 6, characterized by the fact that the return line has a choke (6) a pressure relief valve (7) and a return flow line (8).
  8. Fuel feeding device according to claim 1, characterized by the fact that the high-pressure generator (9) is formed as a radial piston distributor injection pump.
  9. Fuel feeding device according to claim 1, characterized by the fact that the level sensor (14) generates an alarm signal as soon as the liquid level in the intermediate fuel tank (5) drops below a certain level.
  10. Fuel feeding device according to claim 1, characterized by the fact that a level sensor(15) switches off the internal combustion engine as soon as the fluid level in the intermediate fuel tank (5) drops below a certain level.
EP20020027602 2001-12-10 2002-12-10 Fuel supply device for internal combustion engines Expired - Fee Related EP1326020B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10160560 2001-12-10
DE2001160560 DE10160560A1 (en) 2001-12-10 2001-12-10 Fuel delivery system for internal combustion engine, has gas separator arranged before high pressure generator between fuel filter and high pressure generator

Publications (3)

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EP1326020A2 EP1326020A2 (en) 2003-07-09
EP1326020A3 EP1326020A3 (en) 2004-09-08
EP1326020B1 true EP1326020B1 (en) 2006-07-26

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DE (2) DE10160560A1 (en)

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US9316187B2 (en) 2011-01-18 2016-04-19 Carter Fuel Systems, Llc Diesel fuel system with advanced priming

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JPH11257188A (en) * 1998-03-10 1999-09-21 Hitachi Ltd Fuel return valve
JP2000130279A (en) * 1998-10-21 2000-05-09 Toyota Motor Corp High-pressure fuel supplying device of internal combustion engine
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DE102007049582A1 (en) 2007-10-15 2009-04-16 Rapstruck Pflanzenöltechnologie GmbH Fuel tank for use in diesel engine connecting device, has regulating valve arranged in fuel return line attached to outlet port, and filters arranged within housing between inlet ports and between one inlet port and another outlet port
DE102007049582B4 (en) * 2007-10-15 2009-07-23 Rapstruck Pflanzenöltechnologie GmbH Device for connecting a diesel engine to two tanks

Also Published As

Publication number Publication date
EP1326020A3 (en) 2004-09-08
EP1326020A2 (en) 2003-07-09
DE50207627D1 (en) 2006-09-07
DE10160560A1 (en) 2003-06-26

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