EP1893864B1 - Fuel supply device - Google Patents

Fuel supply device Download PDF

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Publication number
EP1893864B1
EP1893864B1 EP06762062A EP06762062A EP1893864B1 EP 1893864 B1 EP1893864 B1 EP 1893864B1 EP 06762062 A EP06762062 A EP 06762062A EP 06762062 A EP06762062 A EP 06762062A EP 1893864 B1 EP1893864 B1 EP 1893864B1
Authority
EP
European Patent Office
Prior art keywords
fuel
line
pressure
jet pump
suction jet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP06762062A
Other languages
German (de)
French (fr)
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EP1893864A1 (en
Inventor
Marc VÖLKER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
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Filing date
Publication date
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Publication of EP1893864A1 publication Critical patent/EP1893864A1/en
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Expired - Fee Related legal-status Critical Current
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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • 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
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025—Feeding by means of a liquid fuel-driven jet pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank

Definitions

  • the invention relates to a fuel supply device according to the preamble of claim 1.
  • a fuel supply device for an internal combustion engine which has a fuel tank in a fuel tank.
  • a fuel pump is provided, which promotes fuel from the fuel tank to the engine.
  • the fuel pump is connected via a fuel line to the internal combustion engine.
  • Within the fuel collection container branches from the fuel line from a supply line, which opens into a suction jet pump.
  • the suction jet pump delivers fuel into the fuel tank.
  • Downstream of the fuel pump and upstream of the suction jet pump, a pressure valve is provided in the supply line. Between the pressure valve and the suction jet pump, a throttle for reducing the pressure at the suction jet pump is arranged.
  • the object of the invention is to provide a device with which the pressure at the suction jet pump can be reduced and thus the noise emission of the suction jet pump can be reduced or eliminated.
  • a pressure limiting valve is provided within a fuel collecting tank upstream of a suction jet pump and downstream of a throttle.
  • the pressure limiting valve is expediently provided in a discharge line, which branches off from the supply line downstream of the throttle and upstream of the suction jet pump.
  • the pressure relief valve is expediently via a connecting line in communication with the fuel pressure regulator.
  • the fuel tank on two sections, which are separated by a survey.
  • a fuel tank and the suction jet pump, the first Suction jet pump, are arranged in a partial area.
  • second suction jet pump is provided, which promotes fuel from the other portion in the fuel tank.
  • the second suction jet pump is located in a branch line which branches off from the supply line.
  • the branch of the branch line is located downstream of the throttle, upstream of the first suction jet pump and upstream of the pressure relief valve. This has the advantage that the pressure can also be reduced at the other suction jet pump.
  • a fuel supply device 1 according to the invention is shown with a suction jet pump 7 according to a first embodiment.
  • the fuel supply device 1 comprises a fuel tank 2, which receives a fuel tank 3.
  • a fuel tank 3 In the fuel tank 3 is an electrically driven Fuel pump 4 is provided which promotes fuel via a fuel line 5 to an internal combustion engine 14, a gasoline engine or a diesel engine.
  • a fuel filter 12 In the fuel line 5, a fuel filter 12 is provided upstream of the internal combustion engine 14.
  • the fuel filter 12 serves to remove particles from the fuel.
  • Downstream of the fuel filter 12 and upstream of the internal combustion engine 14, a fuel pressure regulator 13 is provided, which regulates the fuel pressure in front of the internal combustion engine 14 to a certain, constant pressure.
  • the fuel pressure regulator 13 is connected via a drain line 15 to the fuel tank 2 so that superfluous fuel can flow back into the fuel tank 2.
  • a pressure valve 11 is provided outside of the fuel tank 2.
  • the opening of the pressure valve 11 takes place only when the pressure in the fuel line 5 is so great that the return flow of fuel into the fuel tank 3 does not endanger the safe operation of the internal combustion engine 14 or a secure fuel supply of the internal combustion engine 14.
  • the pressure valve 11 could also be arranged inside the fuel collecting container 2.
  • a feed line 6 branches off from the fuel line 5, in which the suction jet pump 7 is arranged.
  • the suction jet pump 7 delivers fuel into the fuel tank.
  • a throttle 10 Upstream of the suction jet pump 7, the fuel line 6, a throttle 10.
  • the throttle 10 causes a limitation of the volume flow in the flow line 6, so that the pressure in the flow line 6 after the throttle 10 is smaller than the pressure in the flow line 6 before the throttle 10. Der von the throttle 10 achieved pressure drop is not taxable or regulated.
  • the pressure in the flow line 6 upstream of the throttle 10 corresponds to the pressure in the fuel line fifth
  • the pressure limiting valve 8 makes it possible to freely choose the pressure at the suction jet pump 7.
  • a reference terminal of the pressure regulator 13 is connected via the connecting line 16 to the discharge line 9.
  • the opening pressure of the pressure regulator 13 is influenced by the pressure in the discharge line 9.
  • the connecting line 16 opens at an opening 17 in the discharge line.
  • the predetermined pressure from the pressure relief valve 8 Due to the free selectability of the pressure in the region downstream of the throttle 10, the pressure at the suction jet pump 7 can be further reduced. The high, disturbing noise emissions occurring during operation of the internal combustion engine 14 at high system pressures can be reduced or eliminated completely by the pressure limiting valve 8.
  • a second embodiment of the fuel supply device according to the invention is shown.
  • the fuel collecting container 2 has two partial regions, a first partial region 20 and a second partial region 21, which are separated from one another by a projection 22 are separated.
  • the fuel tank 3 with the fuel pump 4 and the suction jet pump 7 are arranged in the first portion 20.
  • a further suction jet pump 24 is provided for fuel delivery of fuel from the second portion 21 in the fuel tank 3.
  • the further, second suction jet pump 24 is located in a branch line 23, which branches off from the supply line 6 downstream of the throttle 10, upstream of the first suction jet pump 7 and upstream of the pressure limiting valve 8.
  • the branch line 23 may, as in Fig. 2 shown, branch off at a node 25 of the flow line 6, at which also the discharge line 9 branches off. Likewise, the branch line 23 could also branch off from the feed line 6 downstream of the throttle 10 and upstream of the node 25. Also, the branch line 23 could branch off downstream of the throttle 10 and downstream of the node 25 of the flow line 6. Likewise, the junction 17 of the connecting line 16 could be identical to the node 25.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Jet Pumps And Other Pumps (AREA)

Description

Die Erfindung betrifft eine Kraftstoffversorgungseinrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel supply device according to the preamble of claim 1.

Aus den gattungsbildenden Patentschriften DE 195 04 217 C2 und EP 1 126 157 A2 geht eine Kraftstoffversorgungseinrichtung für eine Brennkraftmaschine hervor, die einen Kraftstoffvorratsbehälter in einem Kraftstoffsammelbehälter aufweist. In dem Kraftstoffvorratsbehälter ist eine Kraftstoffpumpe vorgesehen, die Kraftstoff aus dem Kraftstoffvorratsbehälter zur Brennkraftmaschine fördert. Die Kraftstoffpumpe ist über eine Kraftstoffleitung mit der Brennkraftmaschine verbunden. Innerhalb des Kraftstoffsammelbehälters zweigt von der Kraftstoffleitung eine Vorlaufleitung ab, die in einer Saugstrahlpumpe mündet. Die Saugstrahlpumpe fördert Kraftstoff in den Kraftstoffvorratsbehälter. Stromab der Kraftstoffpumpe und stromauf der Saugstrahlpumpe ist in der Vorlaufleitung ein Druckventil vorgesehen. Zwischen dem Druckventil und der Saugstrahlpumpe ist eine Drossel zur Reduzierung des Druckes an der Saugstrahlpumpe angeordnet.From the generic patents DE 195 04 217 C2 and EP 1 126 157 A2 shows a fuel supply device for an internal combustion engine, which has a fuel tank in a fuel tank. In the fuel tank, a fuel pump is provided, which promotes fuel from the fuel tank to the engine. The fuel pump is connected via a fuel line to the internal combustion engine. Within the fuel collection container branches from the fuel line from a supply line, which opens into a suction jet pump. The suction jet pump delivers fuel into the fuel tank. Downstream of the fuel pump and upstream of the suction jet pump, a pressure valve is provided in the supply line. Between the pressure valve and the suction jet pump, a throttle for reducing the pressure at the suction jet pump is arranged.

Bei großen Kraftstofffördermengen treten trotz der druckreduzierenden Wirkung der Drossel hohe Drücke in der Vorlaufleitung beziehungsweise an der Saugstrahlpumpe auf, die hohe, störende Geräuschemissionen der Saugstrahlpumpe verursachen.In large fuel flow rates occur despite the pressure-reducing effect of the throttle high pressures in the flow line or on the suction jet pump, causing high, disturbing noise emissions of the ejector.

Die Aufgabe der Erfindung ist es, eine Vorrichtung bereitzustellen, mit der der Druck an der Saugstrahlpumpe reduziert werden kann und damit die Geräuschemission der Saugstrahlpumpe reduziert beziehungsweise eliminiert werden.The object of the invention is to provide a device with which the pressure at the suction jet pump can be reduced and thus the noise emission of the suction jet pump can be reduced or eliminated.

Erfindungsgemäß wird diese Aufgabe gelöst durch die kennzeichnenden Merkmale des Anspruchs 1.According to the invention, this object is achieved by the characterizing features of claim 1.

Bei der erfindungsgemäßen Kraftstoffversorgungseinrichtung zur Kraftstoffversorgung einer Brennkraftmaschine ist innerhalb eines Kraftstoffsammelbehälters stromauf einer Saugstrahlpumpe und stromab einer Drossel ein Druckbegrenzungsventil vorgesehen. Dies hat den Vorteil, dass der Druck an der Saugstrahlpumpe bis zu einem bestimmten maximalen Druck, der von einem Kraftstoffdruckregler vorgegeben ist, frei wählbar ist. Dadurch können bei hohen Systemdrücken hohe, störende Geräuschemissionen der Saugstrahlpumpe reduziert beziehungsweise eliminiert werden.In the fuel supply device according to the invention for supplying fuel to an internal combustion engine, a pressure limiting valve is provided within a fuel collecting tank upstream of a suction jet pump and downstream of a throttle. This has the advantage that the pressure at the suction jet pump up to a certain maximum pressure, which is predetermined by a fuel pressure regulator, is arbitrary. As a result, high, disturbing noise emissions of the ejector pump can be reduced or eliminated at high system pressures.

In einer Ausgestaltung nach Anspruch 2 ist zweckmäßigerweise das Druckbegrenzungsventil in einer Abströmleitung vorgesehen, die stromab der Drossel und stromauf der Saugstrahlpumpe von der Vorlaufleitung abzweigt.In one embodiment according to claim 2, the pressure limiting valve is expediently provided in a discharge line, which branches off from the supply line downstream of the throttle and upstream of the suction jet pump.

In einer weiteren Ausgestaltung nach Anspruch 3 steht das Druckbegrenzungsventil zweckmäßigerweise über eine Verbindungsleitung in Verbindung mit dem Kraftstoffdruckregler.In a further embodiment according to claim 3, the pressure relief valve is expediently via a connecting line in communication with the fuel pressure regulator.

In einer weiteren Ausgestaltung nach Anspruch 4 weist der Kraftstoffsammelbehälter zwei Teilbereiche auf, die durch eine Erhebung voneinander getrennt sind. Ein Kraftstoffvorratsbehälter und die Saugstrahlpumpe, die erste Saugstrahlpumpe, sind in einem Teilbereich angeordnet. Im anderen Teilbereich ist eine weitere, zweite Saugstrahlpumpe vorgesehen, die Kraftstoff aus dem anderen Teilbereich in den Kraftstoffvorratsbehälter fördert. Die zweite Saugstrahlpumpe befindet sich in einer Zweigleitung die von der Vorlaufleitung abzweigt. Die Abzweigung der Zweigleitung befindet sich stromab der Drossel, stromauf der ersten Saugstrahlpumpe und stromauf des Druckbegrenzungsventils. Dies hat den Vorteil, dass der Druck auch an der weiteren Saugstrahlpumpe reduziert werden kann.In a further embodiment according to claim 4, the fuel tank on two sections, which are separated by a survey. A fuel tank and the suction jet pump, the first Suction jet pump, are arranged in a partial area. In the other part of a further, second suction jet pump is provided, which promotes fuel from the other portion in the fuel tank. The second suction jet pump is located in a branch line which branches off from the supply line. The branch of the branch line is located downstream of the throttle, upstream of the first suction jet pump and upstream of the pressure relief valve. This has the advantage that the pressure can also be reduced at the other suction jet pump.

Weitere Vorteile und zweckmäßige Ausführungen der Erfindung sind der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:

Fig.1
eine schematische Darstellung einer Kraftstoffversorgungseinrichtung mit einer Saugstrahlpumpe gemäß einem ersten Ausführungsbeispiel und
Fig. 2
die Kraftstoffversorgungseinrichtung mit zwei Saugstrahlpumpen gemäß einem zweiten Ausführungsbeispiel.
Further advantages and expedient embodiments of the invention can be taken from the description of the figures and the drawings. Show it:
Fig.1
a schematic representation of a fuel supply device with a suction jet pump according to a first embodiment and
Fig. 2
the fuel supply device with two Saugstrahlpumpen according to a second embodiment.

In den folgenden Figuren sind die gleichen oder gleich wirkenden Bauteile mit denselben Bezugszeichen versehen.In the following figures, the same or the same components are provided with the same reference numerals.

In Fig. 1 ist eine erfindungsgemäße Kraftstoffversorgungseinrichtung 1 mit einer Saugstrahlpumpe 7 gemäß einem ersten Ausführungsbeispiel dargestellt. Die Kraftstoffversorgungseinrichtung 1 umfasst einen Kraftstoffsammelbehälter 2, der einen Kraftstoffvorratsbehälter 3 aufnimmt. In dem Kraftstoffvorratsbehälter 3 ist eine elektrisch angetriebene Kraftstoffpumpe 4 vorgesehen, die über eine Kraftstoffleitung 5 Kraftstoff zu einer Brennkraftmaschine 14, ein Ottomotor oder ein Dieselmotor, fördert. In der Kraftstoffleitung 5 ist stromauf der Brennkraftmaschine 14 ein Kraftstofffilter 12 vorgesehen. Der Kraftstofffilter 12 dient der Entfernung von Partikeln aus dem Kraftstoff. Stromab des Kraftstofffilters 12 und stromauf der Brennkraftmaschine 14 ist ein Kraftstoffdruckregler 13 vorgesehen, der den Kraftstoffdruck vor der Brennkraftmaschine 14 auf einen bestimmten, konstanten Druck regelt. Der Kraftstoffdruckregler 13 ist über eine Ablaufleitung 15 mit dem Kraftstoffsammelbehälter 2 so verbunden, dass überflüssiger Kraftstoff in den Kraftstoffsammelbehälter 2 zurückfließen kann.In Fig. 1 a fuel supply device 1 according to the invention is shown with a suction jet pump 7 according to a first embodiment. The fuel supply device 1 comprises a fuel tank 2, which receives a fuel tank 3. In the fuel tank 3 is an electrically driven Fuel pump 4 is provided which promotes fuel via a fuel line 5 to an internal combustion engine 14, a gasoline engine or a diesel engine. In the fuel line 5, a fuel filter 12 is provided upstream of the internal combustion engine 14. The fuel filter 12 serves to remove particles from the fuel. Downstream of the fuel filter 12 and upstream of the internal combustion engine 14, a fuel pressure regulator 13 is provided, which regulates the fuel pressure in front of the internal combustion engine 14 to a certain, constant pressure. The fuel pressure regulator 13 is connected via a drain line 15 to the fuel tank 2 so that superfluous fuel can flow back into the fuel tank 2.

In der Kraftstoffleitung 5 ist ein Druckventil 11 außerhalb des Kraftstoffsammelbehälters 2 vorgesehen. Das Öffnen des Druckventils 11 erfolgt erst dann, wenn der Druck in der Kraftstoffleitung 5 so groß ist, dass das Rückströmen von Kraftstoff in den Kraftstoffvorratsbehälter 3 den sicheren Betrieb der Brennkraftmaschine 14 beziehungsweise eine gesicherte Kraftstoffversorgung der Brennkraftmaschine 14 nicht gefährdet. Das Druckventil 11 könnte auch innerhalb des Kraftstoffsammelbehälters 2 angeordnet sein.In the fuel line 5, a pressure valve 11 is provided outside of the fuel tank 2. The opening of the pressure valve 11 takes place only when the pressure in the fuel line 5 is so great that the return flow of fuel into the fuel tank 3 does not endanger the safe operation of the internal combustion engine 14 or a secure fuel supply of the internal combustion engine 14. The pressure valve 11 could also be arranged inside the fuel collecting container 2.

Innerhalb des Kraftstoffsammelbehälters 2 zweigt von der Kraftstoffleitung 5 eine Vorlaufleitung 6 ab, in welcher die Saugstrahlpumpe 7 angeordnet ist. Die Saugstrahlpumpe 7 fördert Kraftstoff in den Kraftstoffvorratsbehälter 3.Within the fuel collecting container 2, a feed line 6 branches off from the fuel line 5, in which the suction jet pump 7 is arranged. The suction jet pump 7 delivers fuel into the fuel tank. 3

Stromauf der Saugstrahlpumpe 7 weist die Kraftstoffleitung 6 eine Drossel 10 auf. Die Drossel 10 bewirkt eine Begrenzung des Volumenstromes in der Vorlaufleitung 6, so dass der Druck in der Vorlaufleitung 6 nach der Drossel 10 kleiner ist als der Druck in der Vorlaufleitung 6 vor der Drossel 10. Der von der Drossel 10 erzielte Druckabfall ist nicht steuer- oder regelbar. Der Druck in der Vorlaufleitung 6 vor der Drossel 10 entspricht dem Druck in der Kraftstoffleitung 5.Upstream of the suction jet pump 7, the fuel line 6, a throttle 10. The throttle 10 causes a limitation of the volume flow in the flow line 6, so that the pressure in the flow line 6 after the throttle 10 is smaller than the pressure in the flow line 6 before the throttle 10. Der von the throttle 10 achieved pressure drop is not taxable or regulated. The pressure in the flow line 6 upstream of the throttle 10 corresponds to the pressure in the fuel line fifth

Stromab der Drossel 10 und stromauf der Saugstrahldüse 7 zweigt von der Vorlaufleitung 6 eine Abströmleitung 9 ab, in der ein Druckbegrenzungsventil 8 vorgesehen ist. Das Druckbegrenzungsventil 8 erlaubt es, den Druck an der Saugstrahlpumpe 7 frei zu wählen. Ein Referenzanschluß des Druckreglers 13 ist über die Verbindungsleitung 16 mit der Abströmleitung 9 verbunden. Dadurch wird der Öffnungsdruck des Druckreglers 13 vom Druck in der Abströmleitung 9 beeinflusst. Außerdem ist dadurch der Öffnungsdruck des Druckreglers 13 nach dem Abschalten der Kraftstoffpumpe 4 kleiner als während des Betriebes der Kraftstoffpumpe 4. Die Verbindungsleitung 16 mündet an einer Einmündung 17 in die Abströmleitung 9.Downstream of the throttle 10 and upstream of the suction jet nozzle 7 branches off from the flow line 6 from a discharge line 9, in which a pressure relief valve 8 is provided. The pressure limiting valve 8 makes it possible to freely choose the pressure at the suction jet pump 7. A reference terminal of the pressure regulator 13 is connected via the connecting line 16 to the discharge line 9. As a result, the opening pressure of the pressure regulator 13 is influenced by the pressure in the discharge line 9. In addition, thereby the opening pressure of the pressure regulator 13 after switching off the fuel pump 4 is smaller than during operation of the fuel pump 4. The connecting line 16 opens at an opening 17 in the discharge line. 9

In der Vorlaufsleitung 6, stromab der Drossel 10 und stromauf der Saugstrahlpumpe 7, in der Abströmleitung 9 sowie in der Verbindungsleitung 16 liegt der vom Druckbegrenzungsventil 8 vorgegebene Druck an. Durch die freie Wählbarkeit des Druckes in dem Bereich stromab der Drossel 10 kann der Druck an der Saugstrahlpumpe 7 weiter reduziert werden. Die im Betrieb der Brennkraftmaschine 14 bei hohen Systemdrücken auftretenden hohen, störenden Geräuschemissionen sind durch das Druckbegrenzungsventil 8 reduzierbar beziehungsweise vollständig zu entfernen.In the flow line 6, downstream of the throttle 10 and upstream of the suction jet pump 7, in the discharge line 9 and in the connecting line 16 is the predetermined pressure from the pressure relief valve 8. Due to the free selectability of the pressure in the region downstream of the throttle 10, the pressure at the suction jet pump 7 can be further reduced. The high, disturbing noise emissions occurring during operation of the internal combustion engine 14 at high system pressures can be reduced or eliminated completely by the pressure limiting valve 8.

In Fig. 2 ist ein zweites Ausführungsbeispiel der erfindungsgemäßen Kraftstoffversorgungseinrichtung dargestellt. Der Kraftstoffsammelbehälter 2 weist zwei Teilbereiche, einen ersten Teilbereich 20 und einen zweiten Teilbereich 21 auf, die durch eine Erhebung 22 voneinander getrennt sind. Der Kraftstoffvorratsbehälter 3 mit der Kraftstoffpumpe 4 und die Saugstrahlpumpe 7 sind im ersten Teilbereich 20 angeordnet. Im zweiten Teilbereich 21 ist zur Kraftstoffförderung von Kraftstoff aus dem zweiten Teilbereich 21 in den Kraftstoffvorratsbehälter 3 eine weitere Saugstrahlpumpe 24 vorgesehen. Die weitere, zweite Saugstrahlpumpe 24 befindet sich in einer Zweigleitung 23, die von der Vorlaufleitung 6 stromab der Drossel 10, stromauf der ersten Saugstrahlpumpe 7 und stromauf des Druckbegrenzungsventils 8 abzweigt.In Fig. 2 a second embodiment of the fuel supply device according to the invention is shown. The fuel collecting container 2 has two partial regions, a first partial region 20 and a second partial region 21, which are separated from one another by a projection 22 are separated. The fuel tank 3 with the fuel pump 4 and the suction jet pump 7 are arranged in the first portion 20. In the second portion 21, a further suction jet pump 24 is provided for fuel delivery of fuel from the second portion 21 in the fuel tank 3. The further, second suction jet pump 24 is located in a branch line 23, which branches off from the supply line 6 downstream of the throttle 10, upstream of the first suction jet pump 7 and upstream of the pressure limiting valve 8.

Die Zweigleitung 23 kann, wie in Fig. 2 dargestellt, an einem Knotenpunkt 25 von der Vorlaufleitung 6 abzweigen, an dem ebenfalls die Abströmleitung 9 abzweigt. Ebenso könnte die Zweigleitung 23 auch stromab der Drossel 10 und stromauf des Knotenpunktes 25 von der Vorlaufleitung 6 abzweigen. Auch könnte die Zweigleitung 23 stromab der Drossel 10 und stromab des Knotenpunktes 25 von der Vorlaufleitung 6 abzweigen. Ebenso könnte die Einmündung 17 der Verbindungsleitung 16 mit dem Knotenpunkt 25 identisch sein.The branch line 23 may, as in Fig. 2 shown, branch off at a node 25 of the flow line 6, at which also the discharge line 9 branches off. Likewise, the branch line 23 could also branch off from the feed line 6 downstream of the throttle 10 and upstream of the node 25. Also, the branch line 23 could branch off downstream of the throttle 10 and downstream of the node 25 of the flow line 6. Likewise, the junction 17 of the connecting line 16 could be identical to the node 25.

Es können zahlreiche Varianten der Abzweigungen der Zweigleitung 23, der Abströmleitung 9 und der Verbindungsleitung 16 realisiert werden. Es gilt dabei darauf zu achten, dass alle Abzweigungen stromab der Drossel 10 liegen.Numerous variants of the branches of the branch line 23, the discharge line 9 and the connecting line 16 can be realized. It is important to ensure that all branches are downstream of the throttle 10.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
KraftstoffversorgungseinrichtungFuel supply
22
KraftstoffsammelbehälterFuel sump
33
KraftstoffvorratsbehälterFuel tank
44
KraftstoffpumpeFuel pump
55
KraftstoffleitungFuel line
66
Vorlaufleitungsupply line
77
Saugstrahlpumpeeductor
88th
DruckbegrenzungsventilPressure relief valve
99
Abströmleitungoutflow
1010
Drosselthrottle
1111
Druckventilpressure valve
1212
KraftstofffilterFuel filter
1313
KraftstoffdruckreglerFuel pressure regulator
1414
BrennkraftmaschineInternal combustion engine
1515
Ablaufleitungdrain line
1616
Verbindungsleitungconnecting line
1717
Einmündungjunction
1818
1919
2020
erster Teil v. 2first part v. 2
2121
zweiter Teil v. 2second part v. 2
2222
Erhebung v. 2Survey v. 2
2323
Zweigleitungbranch line
2424
Weitere SaugstrahlpumpeFurther suction jet pump
2525
Knotenpunktjunction

Claims (4)

  1. Fuel supply device for the supply of fuel to an internal combustion engine, with at least one electrically driven fuel pump which conveys fuel from a fuel reservoir arranged in a fuel holding tank to the internal combustion engine via a fuel line comprising a fuel pressure regulator, such that a flow line branches off from the fuel line and opens into a suction jet pump and, upstream from the suction jet pump a throttle is arranged in the flow line,
    characterised in that
    a pressure-limiting valve (8) is provided upstream from the suction jet pump (7) and downstream from the throttle (10).
  2. Fuel supply device according to Claim I,
    characterised in that
    upstream from the suction jet pump (7) and downstream from the throttle (10) a run-off line (9) branches off from the flow line (6), in which the pressure-limiting valve (8) is fitted.
  3. Fuel supply device according to Claims 1 or 2,
    characterised in that
    the pressure-limiting valve (8) is connected via a connection line (16) to the fuel pressure regulator (13).
  4. Fuel supply device according to any of Claims 1 to 3,
    characterised in that
    the fuel holding tank (2) comprises at least two portions (20, 21) separated from one another by a raised area (22), and the fuel reservoir (3) and the suction jet pump (7) are arranged in one portion (20) while in the other portion (21) a further suction jet pump (24) is provided for conveying fuel from the second portion (21) into the fuel reservoir (3), and a branch line (23) in which the said further suction jet pump (24) is fitted branches off from the flow line (6) downstream from the throttle (10) and upstream from the pressure-limiting valve (8).
EP06762062A 2005-06-21 2006-06-16 Fuel supply device Expired - Fee Related EP1893864B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005028555 2005-06-21
PCT/EP2006/005783 WO2006136328A1 (en) 2005-06-21 2006-06-16 Fuel supply device

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JP2008546944A (en) 2008-12-25
WO2006136328A1 (en) 2006-12-28
DE502006003105D1 (en) 2009-04-23
US20080149074A1 (en) 2008-06-26
EP1893864A1 (en) 2008-03-05

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