EP0989296A2 - Device for supplying fuel to a combustion engine - Google Patents

Device for supplying fuel to a combustion engine Download PDF

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Publication number
EP0989296A2
EP0989296A2 EP99116814A EP99116814A EP0989296A2 EP 0989296 A2 EP0989296 A2 EP 0989296A2 EP 99116814 A EP99116814 A EP 99116814A EP 99116814 A EP99116814 A EP 99116814A EP 0989296 A2 EP0989296 A2 EP 0989296A2
Authority
EP
European Patent Office
Prior art keywords
fuel
feed pump
pump
combustion engine
feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99116814A
Other languages
German (de)
French (fr)
Other versions
EP0989296A3 (en
EP0989296B1 (en
Inventor
Jörg Ahrens
Kai Schenck
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.)
Volkswagen AG
Magna Powertrain Hueckeswagen GmbH
Original Assignee
Volkswagen AG
LuK Automobiltechnik GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Volkswagen AG, LuK Automobiltechnik GmbH and Co KG filed Critical Volkswagen AG
Publication of EP0989296A2 publication Critical patent/EP0989296A2/en
Publication of EP0989296A3 publication Critical patent/EP0989296A3/en
Application granted granted Critical
Publication of EP0989296B1 publication Critical patent/EP0989296B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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

Definitions

  • the invention relates to a device for delivering fuel to one Internal combustion engine with the features mentioned in the preamble of the main claim.
  • a generic device for is known from the document DE 195 13 822 A1 Conveying fuel from a fuel tank to an internal combustion engine Motor vehicle.
  • the facility consists essentially of a Internal combustion powered feed pump, which is designed as a gear pump and is connected to the fuel tank via a delivery line. This Gear pump delivers the fuel to the injection system of the internal combustion engine.
  • the feed pump forms a structural unit together with an air-conveying pump, whose suction side to generate a vacuum with a brake booster Motor vehicle is connected.
  • the fuel supply is also previously known from document DE 196 12 605 A1 an internal combustion engine by means of a fuel-flushed and in the fuel tank to effect housed electric motor-driven feed pump.
  • the feed pump is located in a storage pot also located in the fuel tank Active connection. There is a separate one in the lower area of this storage pot Liquid jet pump, via which the storage pot is filled and regulated becomes.
  • a second additional pump is provided for the fuel supply described above Securing funding after the fuel tank runs empty is necessary, too deviates from the usual pump types in motor vehicle construction.
  • the invention has for its object a generic pump with regard to improve their suction behavior after emptying the fuel tank while doing so to achieve self-venting.
  • the object of the invention is achieved by the in the characterizing part of Features mentioned claims.
  • the advantages of the invention are in the optimal constructive design of the pump unit with a pressure side Storage pot. Even after the fuel tank is empty, it is quick Fuel delivery with simultaneous ventilation, so a quick engine start is possible.
  • the features of the subclaims are related to the description their effects explained.
  • FIG. 1 essential parts of the fuel supply of an internal combustion engine are shown schematically.
  • a feed pump 1 driven by the internal combustion engine sucks fuel from a fuel tank 5 and initially fills a storage pot 3, which is also vented at the same time.
  • a check valve 7 which opens in the direction of the fuel pump 1 and prevents the sucked-in fuel from falling back into the fuel tank 5.
  • One or more fuel pressure lines 2a are connected to the storage pot 3 above the feed pump 1 (FIGS. 2 and 3), they feed an injection pump or pump-nozzle elements with fuel (neither of which is shown). The fuel that is not supplied to the internal combustion engine from the injection pump or the pump-nozzle elements flows back into the fuel tank 5 via a return line 8 and a pre-pressure valve 9.
  • the storage pot 3 axially covers the area of the feed pump 1 and part of the adjacent sealing limits (Fig. 2 and 3).
  • the ones that form the sealing limits, for example seals 10 consisting of round rings are located in the area of the storage pot 3 in constant contact with fuel over a large part of its extent.
  • A is preferably at the highest point of the storage pot 3 Pressure relief valve 11 connected. This pressure relief valve 11 opens at higher pressure than the pre-pressure valve 9. The return of fuel takes place via the Pressure relief valve 11 and a return line 12 to the suction side of the feed pump 1.

Abstract

An accumulator pot (3) is connected to the feed pump (1) on the pressure side, and a fuel supply line (2a) for the injection system is connected to the accumulator above the feed pump. The accumulator axially covers the area of the feed pump and a part of the sealing boundaries. A pressure relief valve (11) is connected preferably to the highest point of the accumulator pot, and is connected to the suction side of the feed pump via a fuel return line (12). A check valve (7) is installed in the suction line to prevent return of drawn-in fuel.

Description

Die Erfindung betrifft eine Einrichtung zum Fördern von Kraftstoff zu einem Verbrennungsmotor mit den im Oberbegriff des Hauptanspruches genannten Merkmalen.The invention relates to a device for delivering fuel to one Internal combustion engine with the features mentioned in the preamble of the main claim.

Vorbekannt ist durch die Schrift DE 195 13 822 A1 einegattungsgemäße Einrichtung zum Fördern von Kraftstoff aus einem Kraftstofftank zu einem Verbrennungsmotor eines Kraftfahrzeuges. Die Einrichtung besteht im wesentlichen aus einer vom Verbrennungsmotor angetriebenen Förderpumpe, die als Zahnradpumpe ausgeführt ist und über eine Förderleitung mit dem Kraftstofftank in Verbindung steht. Diese Zahnradpumpe fördert den Kraftstoff zur Einspitzanlage des Verbrennungsmotors.A generic device for is known from the document DE 195 13 822 A1 Conveying fuel from a fuel tank to an internal combustion engine Motor vehicle. The facility consists essentially of a Internal combustion powered feed pump, which is designed as a gear pump and is connected to the fuel tank via a delivery line. This Gear pump delivers the fuel to the injection system of the internal combustion engine.

Die Förderpumpe bildet zusammen mit einer Luft fördernden Pumpe eine Baueinheit, deren Saugseite zur Erzeugung eines Unterdruckes mit einem Bremskraftverstärker des Kraftfahrzeuges verbunden ist.The feed pump forms a structural unit together with an air-conveying pump, whose suction side to generate a vacuum with a brake booster Motor vehicle is connected.

Bei leergefahrenem Kraftstofftank besteht bei dieser Bauart die Gefahr, daß der kraftstoffördernde Pumpenteil trocken steht. Diese Tatsache ist weder für den Ansaugvorgang noch für das Dichtsystem vorteilhaft.When the fuel tank is empty, there is a risk that the fuel-pump part is dry. This fact is not for the Intake process still advantageous for the sealing system.

Vorbekannt ist weiterhin durch die Schrift DE 196 12 605 A1, die Kraftstoffversorgung eines Verbrennungsmotors mittels einer von Kraftstoff umspülten und im Kraftstofftank untergebrachten elektromotorisch angetriebenen Förderpumpe zu bewirken. Die Förderpumpe steht mit einem ebenfalls im Kraftstofftank angeordneten Speichertopf in Wirkverbindung. Im unteren Bereich dieses Speichertopfes befindet sich eine gesonderte Flüssigkeitsstrahlpumpe, über welche die Füllung des Speichertopfes erfolgt und geregelt wird. Bei der vorbeschriebenen Kraftstoffversorgung ist eine zweite zusätzliche Pumpe zur Sicherung einer Förderung nach dem Leerfahren des Kraftstofftankes notwendig, die auch von den im Kraftfahrzeugbau üblichen Pumpenbauarten abweicht.The fuel supply is also previously known from document DE 196 12 605 A1 an internal combustion engine by means of a fuel-flushed and in the fuel tank to effect housed electric motor-driven feed pump. The The feed pump is located in a storage pot also located in the fuel tank Active connection. There is a separate one in the lower area of this storage pot Liquid jet pump, via which the storage pot is filled and regulated becomes. A second additional pump is provided for the fuel supply described above Securing funding after the fuel tank runs empty is necessary, too deviates from the usual pump types in motor vehicle construction.

Vorbekannt ist durch die Schrift DE 31 41 080 C2 eine ebenfalls nichtgattungsgemäße Pumpeinrichtung mit einer selbstansaugenden Kreiselpumpe. Die Saugleitung dieser Pumpe ist so ausgebildet, daß nach dem Abstellen der Pumpe in ihr eine bestimmte Flüssigkeitsmenge zurückbleibt. Beim ersten Anfahren saugt die Pumpe diese Flüssigkeitsmenge an, kann damit selbst ansaugen, sich nachfolgend für eine normale Förderung entlüften und füllen.Known from the document DE 31 41 080 C2 is also a non-generic one Pump device with a self-priming centrifugal pump. The suction line of this Pump is designed so that after switching off the pump in it a certain Amount of liquid remains. The pump sucks them the first time it starts up Amount of liquid, can suck itself in, subsequently for a normal Vent and fill the funding.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Förderpumpe hinsichtlich ihres Saugverhaltens nach dem Leerfahren des Kraftstofftankes zu verbessern und dabei ein Selbstentlüften zu erreichen.The invention has for its object a generic pump with regard to improve their suction behavior after emptying the fuel tank while doing so to achieve self-venting.

Die erfindungsgemäße Lösung der Aufgabe erfolgt durch die im kennzeichnenden Teil der Patentansprüche genannten Merkmale. Die Vorzüge der Erfindung bestehen in der optimalen konstruktiven Gestaltung der Pumpeneinheit mit einem druckseitigen Speichertopf. Auch nach leergefahrenem Kraftstofftank erfolgt eine schnelle Kraftstofförderung bei gleichzeitiger Entlüftung, damit ist ein schneller Motorstart möglich. Die Merkmale der Unteransprüche werden in der Beschreibung im Zusammenhang mit ihren Wirkungen erläutert.The object of the invention is achieved by the in the characterizing part of Features mentioned claims. The advantages of the invention are in the optimal constructive design of the pump unit with a pressure side Storage pot. Even after the fuel tank is empty, it is quick Fuel delivery with simultaneous ventilation, so a quick engine start is possible. The features of the subclaims are related to the description their effects explained.

Anhand einer Zeichnung wird nachfolgend ein Ausführungsbeispiel der Erfindung beschrieben.An exemplary embodiment of the invention is described below with the aid of a drawing described.

Es zeigt:

Fig. 1
das Schema einer Kraftstoffversorgung eines Verbrennungsmotors,
Fig. 2
eine schematisch dargestellte Ausführungsform der Baueinheit Förderpumpe - Speichertopf,
Fig. 3
das Schema des Speichertopfes als Schnittdarstellung nach der Linie A-A in Fig. 2.
It shows:
Fig. 1
the diagram of a fuel supply for an internal combustion engine,
Fig. 2
1 shows a schematically illustrated embodiment of the feed pump-storage pot assembly,
Fig. 3
the diagram of the storage pot as a sectional view along the line AA in Fig. 2nd

In Fig. 1 sind wesentliche Teile der Kraftstoffversorgung eines Verbrennungsmotors schematisch dargestellt. Eine vom Verbrennungsmotor angetriebene Förderpumpe 1 saugt aus einem Kraftstofftank 5 Kraftstoff an und füllt zunächst einen Speichertopf 3, der sich dabei auch gleichzeitig entlüftet. In der Saugleitung 6 der Förderpumpe 1 befindet sich ein in Richtung Kraftstoffpumpe 1 öffnendes Rückschlagventil 7, es verhindert das Zurückfallen von angesaugtem Kraftstoff in den Kraftstofftank 5.
Eine oder mehrere Kraftstoffdruckleitungen 2a sind oberhalb der Förderpumpe 1 am Speichertopf 3 angeschlossen (Fig. 2 und 3), sie speisen eine Einspritzpumpe oder Pumpe-Düse-Elemente mit Kraftstoff (beides nicht dargestellt). Der nicht dem Verbrennungsmotor von der Einspritzpumpe oder den Pumpe-Düse-Elementen zugeführte Kraftstoff fließt über eine Rücklaufleitung 8 und ein Vordruckventil 9 in den Kraftstofftank 5 zurück.In Fig. 1, essential parts of the fuel supply of an internal combustion engine are shown schematically. A feed pump 1 driven by the internal combustion engine sucks fuel from a fuel tank 5 and initially fills a storage pot 3, which is also vented at the same time. In the suction line 6 of the feed pump 1 there is a check valve 7 which opens in the direction of the fuel pump 1 and prevents the sucked-in fuel from falling back into the fuel tank 5.
One or more fuel pressure lines 2a are connected to the storage pot 3 above the feed pump 1 (FIGS. 2 and 3), they feed an injection pump or pump-nozzle elements with fuel (neither of which is shown). The fuel that is not supplied to the internal combustion engine from the injection pump or the pump-nozzle elements flows back into the fuel tank 5 via a return line 8 and a pre-pressure valve 9.

Der Speichertopf 3 überdeckt axial den Bereich der Förderpumpe 1 und einen Teil der anliegenden Dichtgrenzen (Fig. 2 und 3). Die die Dichtgrenzen bildenden, beispielsweise aus Rundringen bestehenden Dichtungen 10, stehen im Bereich des Speichertopfes 3 über einen großen Teil ihrer Erstreckung ständig mit Kraftstoff in Berührung.The storage pot 3 axially covers the area of the feed pump 1 and part of the adjacent sealing limits (Fig. 2 and 3). The ones that form the sealing limits, for example seals 10 consisting of round rings are located in the area of the storage pot 3 in constant contact with fuel over a large part of its extent.

Vorzugsweise an der höchsten Stelle des Speichertopfes 3 ist ein Druckbegrenzungsventil 11 angeschlossen. Dieses Druckbegrenzungsventil 11 öffnet bei höherem Druck als das Vordruckventil 9. Der Rücklauf von Kraftstoff erfolgt über das Druckbegrenzungsventil 11 und eine Rücklaufleitung 12 zur Saugseite der Förderpumpe 1.A is preferably at the highest point of the storage pot 3 Pressure relief valve 11 connected. This pressure relief valve 11 opens at higher pressure than the pre-pressure valve 9. The return of fuel takes place via the Pressure relief valve 11 and a return line 12 to the suction side of the feed pump 1.

Bei leergefahrenem Kraftstofftank 5 bleibt ein Mindestniveau 13 an Kraftstoff im Speichertopf 3 (Fig. 3) erhalten. Bei abgestellter Förderpumpe 1 sorgt der Speichertopf 3 für eine Füllung ihrer Förderräume von der Druckseite her. Dabei kriecht Kraftstoff durch die Spalten der Förderelemente und füllt ihre gesamten Förderräume.
Bei Wiederinbetriebnahme der Förderpumpe 1, die vorzugsweise als Zahnrad-, Sperrflügel- oder Flügelzellenpumpe ausgeführt ist, erfolgt sofort, ohne Entlüften von Außen, eine störungsfreie Kraftstofförderung zum Verbrennungsmotor, da die Pumpenräume bereits gefüllt sind.When the fuel tank 5 is empty, a minimum level 13 of fuel in the storage pot 3 (FIG. 3) is maintained. When the feed pump 1 is turned off, the storage pot 3 ensures that its delivery spaces are filled from the pressure side. Fuel creeps through the gaps in the delivery elements and fills their entire delivery areas.
When the feed pump 1, which is preferably designed as a gearwheel, blocking vane or vane cell pump, is put back into operation, there is immediate, trouble-free fuel delivery to the internal combustion engine without venting from the outside, since the pump chambers are already filled.

Claims (5)

Einrichtung zum Fördern von Kraftstoff zu einem Verbrennungsmotor mit einer Förderpumpe zum Speisen einer Einspritzanlage, die als vorzugsweise direkt aus dem Kraftstofftank fördernde und vom Verbrennungsmotor angetriebene Zahnrad- oder Flügelzellenpumpe ausgeführt ist,
dadurch gekennzeichnet,
daß der Förderpumpe (1) druckseitig ein Speichertopf (3) nachgeschaltet ist, wobei eine Kraftstoffzulaufleitung (2a) bzw. Kraftstoffzulaufleitungen zur Einspritzanlage oberhalb der Förderpumpe (1) am Speichertopf (3) angeschlossen ist bzw. sind.Device for delivering fuel to an internal combustion engine with a feed pump for feeding an injection system, which is designed as a gear or vane pump that preferably delivers directly from the fuel tank and is driven by the internal combustion engine,
characterized,
that the feed pump (1) is connected on the pressure side to a reservoir (3), a fuel feed line (2a) or fuel feed lines to the injection system above the feed pump (1) being connected to the reservoir (3). Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Speichertopf (3) axial den Bereich der Förderpumpe (1) und einen Teil der anliegenden Dichtgrenzen überdeckt.Device according to claim 1,
characterized,
that the storage pot (3) axially covers the area of the feed pump (1) and part of the sealing limits. Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß ein Druckbegrenzungsventil (11) vorzugsweise an der höchsten Stelle des Speichertopfes (3) angeschlossen ist.Device according to claim 1,
characterized,
that a pressure relief valve (11) is preferably connected to the highest point of the storage pot (3). Einrichtung nach Anspruch 3,
dadurch gekennzeichnet,
daß das Druckbegrenzungsventil (11) über eine Kraftstoffrücklaufleitung (12) mit der Saugseite der Förderpumpe (1) verbunden ist.Device according to claim 3,
characterized,
that the pressure relief valve (11) is connected via a fuel return line (12) to the suction side of the feed pump (1). Einrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß in der Saugleitung (6) der Förderpumpe (1) ein den Rücklauf von angesaugtem Kraftstoff verhinderndes Rückschlagventil (7) angeordnet ist.Device according to claim 1,
characterized,
that in the suction line (6) of the feed pump (1) a check valve preventing the return of sucked fuel (7) is arranged.
EP99116814A 1998-09-24 1999-09-01 Device for supplying fuel to a combustion engine Expired - Lifetime EP0989296B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843827A DE19843827A1 (en) 1998-09-24 1998-09-24 Device for delivering fuel to an internal combustion engine
DE19843827 1998-09-24

Publications (3)

Publication Number Publication Date
EP0989296A2 true EP0989296A2 (en) 2000-03-29
EP0989296A3 EP0989296A3 (en) 2000-10-25
EP0989296B1 EP0989296B1 (en) 2003-08-20

Family

ID=7882106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116814A Expired - Lifetime EP0989296B1 (en) 1998-09-24 1999-09-01 Device for supplying fuel to a combustion engine

Country Status (4)

Country Link
EP (1) EP0989296B1 (en)
AT (1) ATE247774T1 (en)
DE (2) DE19843827A1 (en)
ES (1) ES2207095T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10026373A1 (en) * 2000-05-27 2001-11-29 Volkswagen Ag High pressure fuel injection system for diesel motors forms a fuel reserve at the flow vessel in the supply circuit to be extracted by the high pressure pump for a constant fuel injection pressure at all motor speeds

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2023716A (en) * 1978-05-31 1980-01-03 Bosch Gmbh Robert Fuel feed unit
US5456233A (en) * 1993-04-28 1995-10-10 Robert Bosch Gmbh Fuel injection arrangement for internal combustion engines

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1474565A (en) * 1974-11-05 1977-05-25 Gen Motors France Internal combustion engine fuel pumps
DE3141080C2 (en) * 1981-10-16 1984-04-12 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh, 7990 Friedrichshafen "Self-priming centrifugal pump"
DE3509374A1 (en) * 1985-03-15 1986-09-25 Robert Bosch Gmbh, 7000 Stuttgart DEVICE FOR PROMOTING FUEL FROM A STORAGE TANK TO THE INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE
DE3903313A1 (en) * 1989-02-04 1990-08-09 Bosch Gmbh Robert STORAGE FUEL INJECTION DEVICE
US5363827A (en) * 1993-10-14 1994-11-15 Carter Automotive Company, Inc. Fuel pump assembly
DE19549507C2 (en) * 1995-04-12 2002-06-06 Bosch Gmbh Robert Device for delivering fuel from a storage tank to an internal combustion engine of a motor vehicle
DE19612605A1 (en) * 1996-03-29 1997-10-02 Bosch Gmbh Robert Device for blocking return of fuel into storage vessel surrounding pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2023716A (en) * 1978-05-31 1980-01-03 Bosch Gmbh Robert Fuel feed unit
US5456233A (en) * 1993-04-28 1995-10-10 Robert Bosch Gmbh Fuel injection arrangement for internal combustion engines

Also Published As

Publication number Publication date
ATE247774T1 (en) 2003-09-15
ES2207095T3 (en) 2004-05-16
DE19843827A1 (en) 2000-03-30
EP0989296A3 (en) 2000-10-25
DE59906653D1 (en) 2003-09-25
EP0989296B1 (en) 2003-08-20

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