EP2159407B1 - Fuel supply device for a motor vehicle - Google Patents

Fuel supply device for a motor vehicle Download PDF

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Publication number
EP2159407B1
EP2159407B1 EP09168890A EP09168890A EP2159407B1 EP 2159407 B1 EP2159407 B1 EP 2159407B1 EP 09168890 A EP09168890 A EP 09168890A EP 09168890 A EP09168890 A EP 09168890A EP 2159407 B1 EP2159407 B1 EP 2159407B1
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EP
European Patent Office
Prior art keywords
valve
supply system
fuel supply
pressure
fuel
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Application number
EP09168890A
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German (de)
French (fr)
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EP2159407A1 (en
Inventor
Günter RAUCHHAUS
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Continental Automotive GmbH
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Continental Automotive GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
    • 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
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/46—Filters structurally associated with 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
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/48—Filters structurally associated with fuel 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
    • 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
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/50—Filters arranged in or on fuel tanks
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven

Definitions

  • the invention relates to a fuel supply system for a motor vehicle with an arranged in the fuel tank, electrically driven fuel delivery unit, with a guided to an internal combustion engine of the motor vehicle supply line and with a pressure sensor for detecting the pressure in the flow line and with a control device for supplying the fuel delivery unit with electric current as a function of the signals of the pressure sensor.
  • Such fuel supply systems with demand-controlled fuel delivery units are commonly used in today's motor vehicles and are known from practice cf. eg DE 10 2006 001878 A1 . DE 10 2007 057 190 A1 . WO 2007/115102 A2 or US 2002/0043253 A1 ,
  • the pressure in the supply line is generated by a corresponding control of the fuel delivery unit.
  • a pressure regulator protects the fuel supply system from exceeding an intended pressure in the supply line. This is necessary if, for example, the pressure rises by a temperature increase in the supply line which takes place after switching off the internal combustion engine of the motor vehicle.
  • the known from practice fuel supply system has a pressure regulator, which, however, is very expensive.
  • the invention is based on the problem to further develop a fuel supply system of the type mentioned that it is constructed particularly inexpensive and reliably prevents the exceeding of the pressure in the flow line.
  • a pressure limiting valve which prevents the pressure in the supply line from being exceeded by discharging the fuel into the fuel tank above an intended pressure. Below the intended pressure in the supply line, the pressure is generated exclusively by the pressure sensor and the control unit controlled by the fuel delivery unit.
  • the pressure relief valve is shot and thus passive and does not interfere with the pressure control.
  • the pressure relief valve is preferably completely closed, thereby preventing a pressure loss and an unnecessary promotion of the fuel within the fuel tank.
  • the pressure relief valve can be manufactured more cost-effectively than a pressure regulator, whereby the fuel supply system according to the invention is constructed particularly cost-effective.
  • Known fuel supply systems generally have a pre-filter disposed in front of the fuel delivery unit and a fine filter arranged in front of the supply line for filtering the fuel.
  • a contamination of the pressure relief valve according to an advantageous embodiment of the invention can be easily avoided when the pressure relief valve is arranged behind a fine filter seen in the flow direction. By these designs malfunction of the pressure relief valve can be avoided.
  • the fuel supply system according to the invention is structurally particularly simple if the pressure relief valve in a mounting opening of the fuel tank closing, a connection for the flow line having flange is arranged.
  • the pressure generated by the fuel delivery unit can be reliably maintained even after a shutdown of the fuel delivery unit when the fine filter has a filter housing with an inlet port of a guided from the fuel delivery unit line and when in the inlet port, a check valve is arranged. With this design, the pressure provided in the supply line is available without time delay when the internal combustion engine is restarted.
  • the components for filtering the fuel and limiting the pressure in the flow line can be particularly compact according to another advantageous embodiment of the invention, when the fine filter is tubular, designed to flow from the outside to the inside and when the pressure relief valve is arranged in the center of the fine filter , By this design, the space required by the fine filter with the pressure relief valve space is kept particularly low.
  • a malfunction of the pressure relief valve can be largely avoided according to another advantageous embodiment of the invention, when a spring element for biasing a valve body against a valve seat of the pressure relief valve is designed frusto-conical in longitudinal section. Due to the frusto-conical design, the spring element is constructed kink-proof, thereby ensuring that the pressure relief valve closes reliably after opening.
  • the valve seat of the pressure relief valve is reliably protected according to another advantageous embodiment of the invention from contamination when the pressure relief valve has a seen in the flow direction arranged in front of the valve seat sieve. This design becomes the danger a malfunction of the pressure relief valve further reduced.
  • the strainer preferably has a mesh width of 100 ⁇ m in today's fuel supply systems intended for the production of diesel fuel.
  • a reliable closing of the pressure limiting valve can be ensured according to the invention if the valve seat is arranged on a metal sheet and if the metal sheet is coated with a rubber-elastic material. Furthermore, it is possible to perform a fine adjustment of the pressure relief valve by a deformation of the sheet of the valve seat. Due to the fine adjustment, the pressure at which the pressure relief valve opens and closes can be adjusted very precisely.
  • the pressure limiting valve can be easily preassembled and adjusted to form a structural unit if the pressure limiting valve has a tubular valve housing with the connection and if the spring element, the valve body, the valve seat and the sieve and / or the throttle in the Valve housing are arranged. Subsequently, the structural unit can be easily mounted in the fuel supply system according to the invention.
  • the fuel supply system according to the invention is thus particularly cost-effective.
  • the assembly of the pressure relief valve is particularly simple according to another advantageous embodiment of the invention, when the pressure relief valve is made in one piece with locking elements.
  • FIG. 1 shows a fuel supply system 1 for supplying an internal combustion engine 2 with fuel with an on-demand arranged in a fuel tank 3 fuel delivery unit 4.
  • the fuel delivery unit 4 has a arranged in a swirl pot 5, driven by an electric motor 7 fuel pump 6.
  • a pre-filter 8 is arranged on a suction side of Fuel pump 6, a pre-filter 8 is arranged.
  • the fuel pump 6 is connected via a guided inside the fuel tank 2 line 9 with a fine filter 10.
  • the fine filter 10 and the swirl pot 5 are each connected to a flange 14, 15 inserted into mounting holes 12, 13 of the fuel tank 3.
  • the swirl pot 5 is also biased by a spring element 16 against the bottom of the fuel tank 3.
  • the arranged inside the fuel tank 3 line 9 is connected to a suction jet pump 17.
  • the suction jet pump 17 delivers fuel from a chamber 18 of the fuel tank 3 in the swirl pot 5.
  • the swirl pot 5 is disposed in a further chamber 19 of the fuel tank 3 and has for its further filling a not shown further suction jet pump and / or a bottom valve 20th
  • the fine filter 10 is in FIG. 2 shown in an enlarged sectional view.
  • the fine filter 10 is tubular, designed to flow through a filter medium 22 from the outside in and has a filter housing 21 with an inlet port 23 and two outlet ports 24, 25.
  • a schematically illustrated check valve 26 connects the guided inside the fuel tank 3 line 9 with the inlet port 23.
  • One of the outlet ports 25 has a pressure relief valve 27.
  • the flow line 11 is connected to the other outlet port 24 of the fine filter 10.
  • the pressure relief valve 27 is located in the center of the fine filter 10.
  • An outlet 28 of the pressure relief valve 27 opens into the in FIG. 1 illustrated fuel tank 3.
  • FIG. 1 also shows that seen in the flow direction before the suction jet pump 17, a further check valve 29 is arranged.
  • the pressure in the flow line 11 is detected by a pressure sensor 30.
  • the pressure sensor 30 supplies electrical signals to a control device 31, which controls the fuel delivery unit 4 via a voltage control 32 as a function of the pressure in the supply line 11.
  • the pressure limiting valve 27 has a tubular valve housing 33 with latching elements 34 arranged on the outside. Via the latching elements 34, the valve housing 33 is fastened and sealed in the filter housing 21 of the fine filter 10 , In the valve housing 33, a channel-like connection 35 is arranged, which is a pressure side of the fine filter 10 connects with the outlet 28 of the pressure relief valve 27 . In the channel-like connection 35 a biased by a spring element 36 against a valve seat 37 valve body 38 is arranged. The spring element 36 is frustoconically designed for security against buckling.
  • the valve seat 37 is made of a coated with a rubber-elastic material 42 sheet 39 and pressed into the valve housing 33. Furthermore, in the channel-like connection 35, a sieve 40 and a throttle 41 are arranged. For clarity, the valve seat 37 with the valve body 38 in FIG. 3a shown greatly enlarged.
  • the valve body 38 If the pressure on the pressure side of the fine filter 10 and thus in the flow line 11 exceeds a prescribed threshold value, the valve body 38 is pressed away from the valve seat 37 against the force of the spring element 36. Thus, the channel-like connection 35 is released and fuel can flow from the flow line 11 into the fuel tank 3. Below the intended threshold value, the pressure relief valve 27 is reliably closed and prevents a flow of fuel from the fine filter 10 or the flow line 11 into the fuel tank 3.
  • the threshold at which the pressure relief valve 27 opens can be adjusted by the use of a correspondingly rigid spring element 36 and in a fine adjustment by a deformation of the valve seat 37 having sheet 39 can be adjusted.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Die Erfindung betrifft eine Kraftstoffversorgungsanlage für ein Kraftfahrzeug mit einer im Kraftstoffbehälter angeordneten, elektrisch angetriebenen Kraftstoff-Fördereinheit, mit einer zu einer Brennkraftmaschine des Kraftfahrzeuges geführten Vorlaufleitung und mit einem Drucksensor zur Erfassung des Drucks in der Vorlaufleitung und mit einer Steuereinrichtung zur Versorgung der Kraftstoff-Fördereinheit mit elektrischem Strom in Abhängigkeit von den Signalen des Drucksensors.The invention relates to a fuel supply system for a motor vehicle with an arranged in the fuel tank, electrically driven fuel delivery unit, with a guided to an internal combustion engine of the motor vehicle supply line and with a pressure sensor for detecting the pressure in the flow line and with a control device for supplying the fuel delivery unit with electric current as a function of the signals of the pressure sensor.

Solche Kraftstoffversorgungsanlagen mit bedarfsgeregelten Kraftstoff-Fördereinheiten werden bei heutigen Kraftfahrzeugen häufig eingesetzt und sind aus der Praxis bekannt vgl. z.B. DE 10 2006 001878 A1 , DE 10 2007 057 190 A1 , WO 2007/115102 A2 oder US 2002/0043253 A1 . Bei solchen Kraftstoffversorgungsanlagen wird der Druck in der Vorlaufleitung von einer entsprechenden Ansteuerung der Kraftstoff-Fördereinheit erzeugt. Ein Druckregler schützt die Kraftstoffversorgungsanlage vor einem Überschreiten eines vorgesehenen Drucks in der Vorlaufleitung. Dies ist erforderlich, falls beispielsweise der Druck durch eine nach dem Abschalten der Brennkraftmaschine des Kraftfahrzeuges erfolgte Temperaturerhöhung in der Vorlaufleitung ansteigt. Die aus der Praxis bekannte Kraftstoffversorgungsanlage weist einen Druckregler auf, welcher jedoch sehr kosteinintensiv ist.Such fuel supply systems with demand-controlled fuel delivery units are commonly used in today's motor vehicles and are known from practice cf. eg DE 10 2006 001878 A1 . DE 10 2007 057 190 A1 . WO 2007/115102 A2 or US 2002/0043253 A1 , In such fuel supply systems, the pressure in the supply line is generated by a corresponding control of the fuel delivery unit. A pressure regulator protects the fuel supply system from exceeding an intended pressure in the supply line. This is necessary if, for example, the pressure rises by a temperature increase in the supply line which takes place after switching off the internal combustion engine of the motor vehicle. The known from practice fuel supply system has a pressure regulator, which, however, is very expensive.

Der Erfindung liegt das Problem zugrunde, eine Kraftstoffversorgungsanlage der eingangs genannten Art so weiter zu bilden, dass sie besonders kostengünstig aufgebaut ist und die Überschreitung des Drucks in der Vorlaufleitung zuverlässig verhindert.The invention is based on the problem to further develop a fuel supply system of the type mentioned that it is constructed particularly inexpensive and reliably prevents the exceeding of the pressure in the flow line.

Dieses Problem wird erfindungsgemäß dadurch gelöst, dass ein Druckbegrenzungsventil mit der Vorlaufleitung verbunden ist und dass das Druckbegrenzungsventil oberhalb eines vorgesehenen Drucks eine Verbindung der Vorlaufleitung mit dem Kraftstoffbehälter freigibt und unterhalb des vorgesehenen Drucks die Verbindung der Vorlaufleitung mit dem Kraftstoffbehälter verschließt.This problem is inventively solved in that a pressure relief valve is connected to the flow line and that the pressure relief valve above a planned Pressure releases a connection of the supply line to the fuel tank and below the intended pressure, the connection of the supply line to the fuel tank.

Erfindungsgemäß ist damit ein Druckbegrenzungsventil vorgesehen, welches ein Überschreiten des Drucks in der Vorlaufleitung dadurch verhindert, dass es oberhalb eines vorgesehenen Drucks den Kraftstoff in den Kraftstoffbehälter ablässt. Unterhalb des vorgesehenen Druckes in der Vorlaufleitung wird der Druck ausschließlich von der über den Drucksensor und der von der Steuereinheit angesteuerten Kraftstoff-Fördereinheit erzeugt. Dabei ist das Druckbegrenzungsventil geschossen und damit passiv und greift nicht in die Drucksteuerung ein. Das Druckbegrenzungsventil ist dabei vorzugsweise vollständig geschlossen und verhindert damit einen Druckverlust und eine unnötige Förderung des Kraftstoffs innerhalb des Kraftstoffbehälters. Das Druckbegrenzungsventil lässt sich kostengünstiger fertigen als ein Druckregler, wodurch die erfindungsgemäße Kraftstoffversorgungsanlage besonders kostengünstig aufgebaut ist.According to the invention, a pressure limiting valve is thus provided which prevents the pressure in the supply line from being exceeded by discharging the fuel into the fuel tank above an intended pressure. Below the intended pressure in the supply line, the pressure is generated exclusively by the pressure sensor and the control unit controlled by the fuel delivery unit. The pressure relief valve is shot and thus passive and does not interfere with the pressure control. The pressure relief valve is preferably completely closed, thereby preventing a pressure loss and an unnecessary promotion of the fuel within the fuel tank. The pressure relief valve can be manufactured more cost-effectively than a pressure regulator, whereby the fuel supply system according to the invention is constructed particularly cost-effective.

Bekannte Kraftstoffversorgungsanlagen weisen in der Regel einen vor der Kraftstoff-Fördereinheit angeordneten Vorfilter und einen unmittelbar vor der Vorlaufleitung angeordneten Feinfilter zur Filterung des Kraftstoffs auf. Hierbei lässt sich eine Verschmutzung des Druckbegrenzungsventils gemäß einer vorteilhaften Weiterbildung der Erfindung einfach vermeiden, wenn das Druckbegrenzungsventil in Strömungsrichtung gesehen hinter einem Feinfilter angeordnet ist. Durch diese Gestaltungen werden Fehlfunktionen des Druckbegrenzungsventils vermieden.Known fuel supply systems generally have a pre-filter disposed in front of the fuel delivery unit and a fine filter arranged in front of the supply line for filtering the fuel. In this case, a contamination of the pressure relief valve according to an advantageous embodiment of the invention can be easily avoided when the pressure relief valve is arranged behind a fine filter seen in the flow direction. By these designs malfunction of the pressure relief valve can be avoided.

Die erfindungsgemäße Kraftstoffversorgungsanlage gestaltet sich konstruktiv besonders einfach, wenn das Druckbegrenzungsventil in einem eine Montageöffnung des Kraftstoffbehälters verschließenden, einen Anschluss für die Vorlaufleitung aufweisenden Flansch angeordnet ist.The fuel supply system according to the invention is structurally particularly simple if the pressure relief valve in a mounting opening of the fuel tank closing, a connection for the flow line having flange is arranged.

Der von der Kraftstoff-Fördereinheit erzeugte Druck lässt sich auch nach einem Abschalten der Kraftstoff-Fördereinheit zuverlässig halten, wenn der Feinfilter ein Filtergehäuse mit einem Einlassanschluss einer von der Kraftstoff-Fördereinheit geführten Leitung hat und wenn in dem Einlassanschluss ein Rückschlagventil angeordnet ist. Durch diese Gestaltung steht der in der Vorlaufleitung vorgesehene Druck bei einem Neustart der Brennkraftmaschine ohne Zeitverzug zur Verfügung.The pressure generated by the fuel delivery unit can be reliably maintained even after a shutdown of the fuel delivery unit when the fine filter has a filter housing with an inlet port of a guided from the fuel delivery unit line and when in the inlet port, a check valve is arranged. With this design, the pressure provided in the supply line is available without time delay when the internal combustion engine is restarted.

Die Bauteile zur Filterung des Kraftstoffs und zur Begrenzung des Drucks in der Vorlaufleitung lassen sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung besonders kompakt zusammenstellen, wenn der Feinfilter rohrförmig, zur Durchströmung von außen nach innen gestaltet ist und wenn das Druckbegrenzungsventil im Zentrum des Feinfilters angeordnet ist. Durch diese Gestaltung wird der von dem Feinfilter mit dem Druckbegrenzungsventil benötigte Bauraum besonders gering gehalten.The components for filtering the fuel and limiting the pressure in the flow line can be particularly compact according to another advantageous embodiment of the invention, when the fine filter is tubular, designed to flow from the outside to the inside and when the pressure relief valve is arranged in the center of the fine filter , By this design, the space required by the fine filter with the pressure relief valve space is kept particularly low.

Eine Fehlfunktion des Druckbegrenzungsventils lässt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung weitgehend vermeiden, wenn ein Federelement zur Vorspannung eines Ventilkörpers gegen einen Ventilsitz des Druckbegrenzungsventils im Längsschnitt kegelstumpfförmig gestaltet ist. Durch die kegelstumpfförmige Gestaltung ist das Federelement knicksicher aufgebaut, wodurch sichergestellt wird, dass das Druckbegrenzungsventil nach einem Öffnen zuverlässig schließt.A malfunction of the pressure relief valve can be largely avoided according to another advantageous embodiment of the invention, when a spring element for biasing a valve body against a valve seat of the pressure relief valve is designed frusto-conical in longitudinal section. Due to the frusto-conical design, the spring element is constructed kink-proof, thereby ensuring that the pressure relief valve closes reliably after opening.

Der Ventilsitz des Druckbegrenzungsventils wird gemäß einer anderen vorteilhaften Weiterbildung der Erfindung zuverlässig vor Verschmutzung geschützt, wenn das Druckbegrenzungsventil ein in Strömungsrichtung gesehen vor dem Ventilsitz angeordnetes Sieb aufweist. Durch diese Gestaltung wird die Gefahr einer Fehlfunktion des Druckbegrenzungsventils weiter verringert. Das Sieb weist bei heutigen, zur Förderung von Dieselkraftstoff vorgesehenen Kraftstoffversorgungsanlagen vorzugsweise eine Maschenweite von 100 µm auf.The valve seat of the pressure relief valve is reliably protected according to another advantageous embodiment of the invention from contamination when the pressure relief valve has a seen in the flow direction arranged in front of the valve seat sieve. This design becomes the danger a malfunction of the pressure relief valve further reduced. The strainer preferably has a mesh width of 100 μm in today's fuel supply systems intended for the production of diesel fuel.

Durch ein Ablassen von Kraftstoff aus der Vorlaufleitung durch das Druckbegrenzungsventil erzeugte störende Geräusche lassen sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung einfach vermeiden, wenn das Druckbegrenzungsventil eine Drossel aufweist.By discharging fuel from the flow line through the pressure relief valve generated disturbing noise can be easily avoided according to another advantageous embodiment of the invention, when the pressure relief valve has a throttle.

Ein zuverlässiges Schließendes Druckbegrenzungsventils lässt sich erfindungsgemäß sicherstellen, wenn der Ventilsitz auf einem Blech angeordnet ist und wenn das Blech mit einem gummielastischen Material beschichtet ist. Weiterhin besteht die Möglichkeit, eine Feinjustierung des Druckbegrenzungsventils durch eine Verformung des Blechs des Ventilsitzes durchzuführen. Durch die Feinjustierung lässt sich der Druck, bei dem das Druckbegrenzungsventil öffnet und schließt, besonders exakt einstellen.A reliable closing of the pressure limiting valve can be ensured according to the invention if the valve seat is arranged on a metal sheet and if the metal sheet is coated with a rubber-elastic material. Furthermore, it is possible to perform a fine adjustment of the pressure relief valve by a deformation of the sheet of the valve seat. Due to the fine adjustment, the pressure at which the pressure relief valve opens and closes can be adjusted very precisely.

Das Druckbegrenzungsventil lässt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung einfach zu einer baulichen Einheit vormontieren und justieren, wenn das Druckbegrenzungsventil ein rohrförmiges Ventilgehäuse mit der Verbindung hat und wenn das Federelement, der Ventilkörper, der Ventilsitz und das Sieb und/oder die Drossel in dem Ventilgehäuse angeordnet sind. Anschließend lässt sich die bauliche Einheit einfach in der erfindungsgemäßen Kraftstoffversorgungsanlage montieren. Die erfindungsgemäße Kraftstoffversorgungsanlage gestaltet sich hierdurch besonders kostengünstig.According to another advantageous development of the invention, the pressure limiting valve can be easily preassembled and adjusted to form a structural unit if the pressure limiting valve has a tubular valve housing with the connection and if the spring element, the valve body, the valve seat and the sieve and / or the throttle in the Valve housing are arranged. Subsequently, the structural unit can be easily mounted in the fuel supply system according to the invention. The fuel supply system according to the invention is thus particularly cost-effective.

Die Montage des Druckbegrenzungsventils gestaltet sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung besonders einfach, wenn das Druckbegrenzungsventil einstückig mit Rastelementen gefertigt ist.The assembly of the pressure relief valve is particularly simple according to another advantageous embodiment of the invention, when the pressure relief valve is made in one piece with locking elements.

Die Erfindung lässt zahlreiche Ausführungsformen zu. Zur weiteren Verdeutlichung ihres Grundprinzips ist eine davon in der Zeichnung dargestellt und wird nachfolgend beschrieben. Diese zeigt in:

Fig. 1
schematisch eine erfindungsgemäße Kraftstoffversor- gungsanlage;
Fig. 2
vergrößert eine Schnittdarstellung eines Feinfil- ters der Kraftstoffversorgungsanlage aus Figur 1;
Fig. 3
vergrößert eine Schnittdarstellung eines Druckbe- grenzungsventils der Kraftstoffversorgungsanlage aus Figur 1 mit angrenzenden Bereichen des Feinfil- ters;
Fig. 3a
stark vergrößert einen Ventilsitz mit einem Ventil- körper des Druckbegrenzungsventils aus Figur 3.
The invention allows numerous embodiments. To further clarify its basic principle, one of them is shown in the drawing and will be described below. This shows in:
Fig. 1
schematically a fuel supply system according to the invention;
Fig. 2
enlarges a sectional view of a fine filter of the fuel supply system FIG. 1 ;
Fig. 3
enlarges a sectional view of a pressure limiting valve of the fuel supply system FIG. 1 with adjacent areas of the fine filter;
Fig. 3a
greatly enlarges a valve seat with a valve body of the pressure relief valve FIG. 3 ,

Figur 1 zeigt eine Kraftstoffversorgungsanlage 1 zur Versorgung einer Brennkraftmaschine 2 mit Kraftstoff mit einer bedarfsgesteuerten, in einem Kraftstoffbehälter 3 angeordneten Kraftstoff-Fördereinheit 4. Die Kraftstoff-Fördereinheit 4 hat eine in einem Schwalltopf 5 angeordnete, von einem Elektromotor 7 angetriebene Kraftstoffpumpe 6. An einer Saugseite der Kraftstoffpumpe 6 ist ein Vorfilter 8 angeordnet. Die Kraftstoffpumpe 6 ist über eine innerhalb des Kraftstoffbehälters 2 geführte Leitung 9 mit einem Feinfilter 10 verbunden. An dem Feinfilter 10 ist eine zu der Brennkraftmaschine 2 geführte Vorlaufleitung 11 angeschlossen. Der Feinfilter 10 und der Schwalltopf 5 sind jeweils mit einem in Montageöffnungen 12, 13 des Kraftstoffbehälters 3 eingesetzten Flansch 14, 15 verbunden. Der Schwalltopf 5 wird zudem von einem Federelement 16 gegen den Boden des Kraftstoffbehälters 3 vorgespannt. Weiterhin ist die innerhalb des Kraftstoffbehälters 3 angeordnete Leitung 9 mit einer Saugstrahlpumpe 17 verbunden. Die Saugstrahlpumpe 17 fördert Kraftstoff von einer Kammer 18 des Kraftstoffbehälters 3 in den Schwalltopf 5. Der Schwalltopf 5 ist in einer weiteren Kammer 19 des Kraftstoffbehälters 3 angeordnet und hat zu seiner weiteren Befüllung eine nicht dargestellte weitere Saugstrahlpumpe und/oder ein Bodenventil 20. FIG. 1 shows a fuel supply system 1 for supplying an internal combustion engine 2 with fuel with an on-demand arranged in a fuel tank 3 fuel delivery unit 4. The fuel delivery unit 4 has a arranged in a swirl pot 5, driven by an electric motor 7 fuel pump 6. On a suction side of Fuel pump 6, a pre-filter 8 is arranged. The fuel pump 6 is connected via a guided inside the fuel tank 2 line 9 with a fine filter 10. At the fine filter 10 is guided to the engine 2 feed line 11 is connected. The fine filter 10 and the swirl pot 5 are each connected to a flange 14, 15 inserted into mounting holes 12, 13 of the fuel tank 3. The swirl pot 5 is also biased by a spring element 16 against the bottom of the fuel tank 3. Furthermore, the arranged inside the fuel tank 3 line 9 is connected to a suction jet pump 17. The suction jet pump 17 delivers fuel from a chamber 18 of the fuel tank 3 in the swirl pot 5. The swirl pot 5 is disposed in a further chamber 19 of the fuel tank 3 and has for its further filling a not shown further suction jet pump and / or a bottom valve 20th

Zur Verdeutlichung ist der Feinfilter 10 in Figur 2 in einer vergrößerten Schnittdarstellung dargestellt. Der Feinfilter 10 ist rohrförmig, zur Durchströmung eines Filtermediums 22 von außen nach innen gestaltet und hat ein Filtergehäuse 21 mit einem Einlassanschluss 23 und mit zwei Auslassanschlüssen 24, 25. Ein schematisch dargestelltes Rückschlagventil 26 verbindet die innerhalb des Kraftstoffbehälters 3 geführte Leitung 9 mit dem Einlassanschluss 23. Einer der Auslassanschlüsse 25 hat ein Druckbegrenzungsventil 27. Die Vorlaufleitung 11 ist an dem anderen Auslassanschluss 24 des Feinfilters 10 angeschlossen. Das Druckbegrenzungsventil 27 befindet sich im Zentrum des Feinfilters 10. Ein Auslass 28 des Druckbegrenzungsventils 27 mündet in den in Figur 1 dargestellten Kraftstoffbehälter 3.For clarity, the fine filter 10 is in FIG. 2 shown in an enlarged sectional view. The fine filter 10 is tubular, designed to flow through a filter medium 22 from the outside in and has a filter housing 21 with an inlet port 23 and two outlet ports 24, 25. A schematically illustrated check valve 26 connects the guided inside the fuel tank 3 line 9 with the inlet port 23. One of the outlet ports 25 has a pressure relief valve 27. The flow line 11 is connected to the other outlet port 24 of the fine filter 10. The pressure relief valve 27 is located in the center of the fine filter 10. An outlet 28 of the pressure relief valve 27 opens into the in FIG. 1 illustrated fuel tank 3.

Figur 1 zeigt zudem, dass in Strömungsrichtung gesehen vor der Saugstrahlpumpe 17 ein weiteres Rückschlagventil 29 angeordnet ist. Der Druck in der Vorlaufleitung 11 wird von einem Drucksensor 30 erfasst. Der Drucksensor 30 liefert elektrische Signale zu einer Steuereinrichtung 31, welche die Kraftstoff-Fördereinheit 4 über eine Spannungssteuerung 32 in Abhängigkeit von dem Druck in der Vorlaufleitung 11 ansteuert. FIG. 1 also shows that seen in the flow direction before the suction jet pump 17, a further check valve 29 is arranged. The pressure in the flow line 11 is detected by a pressure sensor 30. The pressure sensor 30 supplies electrical signals to a control device 31, which controls the fuel delivery unit 4 via a voltage control 32 as a function of the pressure in the supply line 11.

Figur 3 zeigt stark vergrößert das an dem einen Auslassanschluss 25 des Feinfilters 10 angeschlossene Druckbegrenzungsventil 27. Das Druckbegrenzungsventil 27 hat ein rohrförmiges Ventilgehäuse 33 mit an der Außenseite angeordneten Rastelementen 34. Über die Rastelemente 34 wird das Ventilgehäuse 33 in dem Filtergehäuse 21 des Feinfilters 10 befestigt und abgedichtet. In dem Ventilgehäuse 33 ist eine kanalartige Verbindung 35 angeordnet, welche eine Druckseite des Feinfilters 10 mit dem Auslass 28 des Druckbegrenzungsventils 27 verbindet. In der kanalartigen Verbindung 35 ist ein von einem Federelement 36 gegen einen Ventilsitz 37 vorgespannter Ventilkörper 38 angeordnet. Das Federelement 36 ist zur Sicherheit gegen ein Knicken kegelstumpfförmig gestaltet. Der Ventilsitz 37 ist aus einem mit einem gummielastischen Material 42 beschichteten Blech 39 gefertigt und in dem Ventilgehäuse 33 eingepresst. Weiterhin sind in der kanalartigen Verbindung 35 ein Sieb 40 und eine Drossel 41 angeordnet. Zur Verdeutlichung ist der Ventilsitz 37 mit dem Ventilkörper 38 in Figur 3a stark vergrößert dargestellt. FIG. 3 The pressure limiting valve 27 has a tubular valve housing 33 with latching elements 34 arranged on the outside. Via the latching elements 34, the valve housing 33 is fastened and sealed in the filter housing 21 of the fine filter 10 , In the valve housing 33, a channel-like connection 35 is arranged, which is a pressure side of the fine filter 10 connects with the outlet 28 of the pressure relief valve 27. In the channel-like connection 35 a biased by a spring element 36 against a valve seat 37 valve body 38 is arranged. The spring element 36 is frustoconically designed for security against buckling. The valve seat 37 is made of a coated with a rubber-elastic material 42 sheet 39 and pressed into the valve housing 33. Furthermore, in the channel-like connection 35, a sieve 40 and a throttle 41 are arranged. For clarity, the valve seat 37 with the valve body 38 in FIG. 3a shown greatly enlarged.

Übersteigt der Druck auf der Druckseite des Feinfilters 10 und damit in der Vorlaufleitung 11 einen vorgesehenen Schwellenwert, wird der Ventilkörper 38 gegen die Kraft des Federelementes 36 von dem Ventilsitz 37 weg gedrückt. Damit wird die kanalartige Verbindung 35 freigegeben und Kraftstoff kann aus der Vorlaufleitung 11 in den Kraftstoffbehälter 3 abfließen. Unterhalb des vorgesehenen Schwellenwertes ist das Druckbegrenzungsventil 27 zuverlässig geschlossen und verhindert ein Abfließen von Kraftstoff aus dem Feinfilter 10 oder der Vorlaufleitung 11 in den Kraftstoffbehälter 3. Der Schwellenwert, bei dem das Druckbegrenzungsventil 27 öffnet, kann durch den Einsatz eines entsprechend steifen Federelementes 36 eingestellt und in einer Feinjustage durch eine Verformung des den Ventilsitz 37 aufweisenden Bleches 39 eingestellt werden.If the pressure on the pressure side of the fine filter 10 and thus in the flow line 11 exceeds a prescribed threshold value, the valve body 38 is pressed away from the valve seat 37 against the force of the spring element 36. Thus, the channel-like connection 35 is released and fuel can flow from the flow line 11 into the fuel tank 3. Below the intended threshold value, the pressure relief valve 27 is reliably closed and prevents a flow of fuel from the fine filter 10 or the flow line 11 into the fuel tank 3. The threshold at which the pressure relief valve 27 opens, can be adjusted by the use of a correspondingly rigid spring element 36 and in a fine adjustment by a deformation of the valve seat 37 having sheet 39 can be adjusted.

Claims (10)

  1. Fuel supply system (1) for a motor vehicle, having an electrically driven fuel delivery unit (4) arranged in the fuel tank (3), having a feed line (11) which leads to an internal combustion engine (2) of the motor vehicle, and having a pressure sensor (30) for detecting the pressure in the feed line (11) and having a control device (31) for supplying electrical current to the fuel delivery unit (4) as a function of the signals from the pressure sensor (30), wherein a pressure limiting valve (27) is connected to the feed line (11), wherein the pressure limiting valve (27), above a certain pressure, opens up a connection (35) of the feed line (11) to the fuel tank (3) and, below the certain pressure, closes the connection of the feed line (11) to the fuel tank (3), characterized in that the valve seat (37) of the pressure limiting valve (27) is arranged on a metal plate (39) and in that the metal plate (39) is coated with a resiliently elastic material (42).
  2. Fuel supply system according to Claim 1, characterized in that the pressure limiting valve (27) is arranged downstream of a fine filter (10) as viewed in the flow direction.
  3. Fuel supply system according to Claim 1, characterized in that the pressure limiting valve (27) is arranged in a flange (14) which closes off an assembly opening (12) of the fuel tank (3) and which has a port for the feed line (11).
  4. Fuel supply system according to Claim 2 or 3, characterized in that the fine filter (10) has a filter housing (21) with an inlet port (23) for a line (9) leading from the fuel delivery unit (4), and in that a check valve (26) is arranged in the inlet port (23).
  5. Fuel supply system according to one of Claims 2 to 4, characterized in that the fine filter (10) is tubular and designed for flow to pass through it from the outside to the inside, and in that the pressure limiting valve (27) is arranged in the centre of the fine filter (10).
  6. Fuel supply system according to one of the preceding claims, characterized in that a spring element (36) for preloading a valve body (38) against the valve seat (37) of the pressure limiting valve (27) is of frustoconical design in a longitudinal section.
  7. Fuel supply system according to one of the preceding claims, characterized in that the pressure limiting valve (27) has a screen (40) arranged upstream of the valve seat (37) as viewed in the flow direction.
  8. Fuel supply system according to one of the preceding claims, characterized in that the pressure limiting valve (27) has a restrictor (41).
  9. Fuel supply system according to one of Claims 6 to 8, characterized in that the pressure limiting valve (27) has a tubular valve housing (33) with the connection (35), and in that the spring element (36), the valve body (38), the valve seat (37) and the screen (40) and/or the restrictor (41) are arranged in the valve housing (33).
  10. Fuel supply system according to one of the preceding claims, characterized in that the pressure limiting valve (27) is produced in one piece with detent elements (34).
EP09168890A 2008-08-29 2009-08-28 Fuel supply device for a motor vehicle Active EP2159407B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008044904A DE102008044904A1 (en) 2008-08-29 2008-08-29 Fuel supply system for a motor vehicle

Publications (2)

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EP2159407A1 EP2159407A1 (en) 2010-03-03
EP2159407B1 true EP2159407B1 (en) 2012-05-23

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ID=41382356

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Application Number Title Priority Date Filing Date
EP09168890A Active EP2159407B1 (en) 2008-08-29 2009-08-28 Fuel supply device for a motor vehicle

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EP (1) EP2159407B1 (en)
DE (1) DE102008044904A1 (en)
ES (1) ES2388208T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012020321A1 (en) 2012-10-13 2014-05-08 Volkswagen Aktiengesellschaft Fuel supply device for supplying fuel to engine-independent heater, in internal combustion engine of vehicle i.e. motor car, has ejector pump oriented with delivery direction parallel to vertical vehicle axis
EP2906813B1 (en) 2012-10-13 2018-04-18 Volkswagen AG Fuel supply device
CN108533427A (en) * 2018-03-22 2018-09-14 安徽江淮汽车集团股份有限公司 A kind of automotive fuel oil system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011848A (en) * 1975-08-15 1977-03-15 Chrysler Corporation Fuel filter and roll-over valve
US6098652A (en) * 1999-01-21 2000-08-08 Parr Manufacturing, Inc. Quick connect fuel filter and regulator
US6532941B2 (en) * 2000-08-29 2003-03-18 Delphi Technologies, Inc. Electronic returnless fuel system
DE20203515U1 (en) * 2002-03-05 2002-07-11 TRW Fahrwerksysteme GmbH & Co KG, 40547 Düsseldorf Combined check and pressure relief valve
DE102006001878A1 (en) * 2006-01-13 2007-07-19 Siemens Ag Fuel conveyor
WO2007115102A2 (en) * 2006-03-29 2007-10-11 Robert Bosch Gmbh Fuel system with pressure regulation and pressure relief
DE102006024456A1 (en) * 2006-05-24 2007-11-29 Siemens Ag eductor
US7431020B2 (en) * 2006-11-30 2008-10-07 Denso International America, Inc. Adaptive fuel delivery module in a mechanical returnless fuel system

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Publication number Publication date
EP2159407A1 (en) 2010-03-03
ES2388208T3 (en) 2012-10-10
DE102008044904A1 (en) 2010-03-04

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