EP1078155B1 - Fuel supply system for a motor vehicle - Google Patents

Fuel supply system for a motor vehicle Download PDF

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Publication number
EP1078155B1
EP1078155B1 EP00914091A EP00914091A EP1078155B1 EP 1078155 B1 EP1078155 B1 EP 1078155B1 EP 00914091 A EP00914091 A EP 00914091A EP 00914091 A EP00914091 A EP 00914091A EP 1078155 B1 EP1078155 B1 EP 1078155B1
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EP
European Patent Office
Prior art keywords
fuel
filter
engine
pressure accumulator
fuel system
Prior art date
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Expired - Lifetime
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EP00914091A
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German (de)
French (fr)
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EP1078155A1 (en
Inventor
Hugo Kroiss
Christian Treml
Georg Wissenbach
Jürgen TURINI
Simon Lösch
Henning Bode
Michael Hofrichter
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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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
    • 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
    • F02M37/38—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 with regeneration means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—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
    • F02M37/34—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 by the filter structure, e.g. honeycomb, mesh or fibrous
    • 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 fuel system for a motor vehicle according to the preamble of claim 1 and is based on US 5,647,329.
  • Fuel systems for motor vehicles with a Fuel filters are provided, the fuel filter being inside and / or can be installed outside of a fuel tank.
  • This fuel filter are usually only flowed through in one direction. This sets in on the Side of the filter on which the fuel flows into the fuel filter, in the course of Waste the dirt contained in the fuel more and more. At a high A portion of the dirt in the fuel can form a filter cake over time leads to an increase in flow resistance. This increases the Performance requirement for a fuel pump located in the fuel system on.
  • US 5,647,329 describes one in the fuel tank built-in fuel pump with a fuel filter and a pressure regulator and an associated reservoir, from which reservoir after the Fuel pump or the motor vehicle engine to which this fuel pump promotes the fuel, fuel should flow in the opposite direction, to flush the fuel filter.
  • rinsed out of the filter Dirt particles remain in the vicinity of the filter and during a new conveyor operation the fuel pump can be sucked back into the filter immediately. in the otherwise, the flushing of the fuel filter is likely in this known prior art done only very limited after following the detailed description in US 5,647,329 the so-called reservoir within the fuel tank is open and therefore depressurized.
  • DE 25 05 925 A is a fuel delivery system with a pressurized fuel reservoir
  • the pressure in the fuel delivery system is maintained for a long time.
  • the object of the present invention is to provide a fuel system for a motor vehicle according to the preamble of claim 1, with which the fuel filter is flushed in such an effective manner that the flow resistance of the fuel filter does not or only relatively over the running time of the vehicle increases slightly. This object is achieved by the characterizing features of claim 1.
  • the fuel system according to the invention has a fuel filter in which a Deposit pan is formed.
  • a pressure accumulator in the fuel system installed so that the fuel in the pressure accumulator after the parking of an engine of the motor vehicle relaxes and the filter of the Fuel outlet side or clean side to the fuel inlet side or dirt side flushed. This advantageously results in that on the fuel inlet side Accumulated dirt loosens from the filter and settles in the deposit pan collects.
  • the deposit trough according to the invention is advantageously by a Structure of the housing, for example by the formation of guide vanes, so designed that the deposit pan is not flowed through by fuel, so that the deposited dirt is not whirled up.
  • the fuel filter according to the invention can advantageously on the pressure side or suction side in the fuel system, d. H. behind or in front of the fuel pump, to be ordered.
  • a delay valve is in the Fuel system provided to build up pressure after starting the engine not affect the fuel system by filling the pressure accumulator.
  • the fuel system according to the invention advantageously results in a longer service life of the fuel filter. It is also advantageous that the construction of the fuel filter according to the invention a reduction in the filter volume compared to a known fuel filter with the same Service life is possible.
  • the flow resistance of the fuel filter is approximately constant. This must the fuel pump of the fuel system only the normal pressure and not one Apply increased pressure as with a clogged fuel filter so that the lifespan of the fuel pump is longer compared to using fuel systems conventional fuel filters.
  • the fuel filter, the pressure regulator, the fuel pump, the check valve, the pressure accumulator and possibly the surge pot is executable, so that the number of sealing points lower and thus the emissions are lower.
  • FIG. 1 shows a first embodiment of a fuel system 1, in which one Fuel pump 2 from a fuel tank 3, for example via a not illustrated surge pot, fuel 4 via lines 5 to a fuel filter 6 promotes.
  • the fuel filter 6 has a housing 7 in which a filter material 8, For example, filter cloth or filter paper is arranged.
  • a deposit pan 9 in the housing 7 which is arranged or protected so that the filter material by the 8th flowing fuel 4 that accumulates in the deposit pan 9 Dirt 10 not affected.
  • 7 guide vanes in the housing or baffles can be provided, which a whirling up in the Deposit pan 9 of dirt 10 due to the fuel flow prevent.
  • the fuel filter 6 has on the housing 7 at least one inlet opening 11 for the fuel to be cleaned 4 and at least one outlet opening 12 from which the cleaned fuel 4 into a Line 13 flows.
  • the filter material 8 adjoining the inlet opening 11 Soiled the fastest, for this reason, this side of the filter material 8 hereinafter referred to as the dirt side.
  • With the line 13 is at one Branch 20 connected to a line 14 leading to a pressure accumulator 15.
  • the cleaned fuel 4 flows through a check valve 16 and one itself subsequent pressure regulator 17 through a line 21 to a motor 18.
  • the fuel pump 2 delivers a predetermined amount while the engine 18 is running Fuel 4 in the pressure accumulator 15, for example as a diaphragm pressure accumulator can be trained. After the engine 18 has been switched off, relaxation takes place of the pressure accumulator 15, so that the one located in the pressure accumulator 15 Fuel 4 via line 13 and through outlet 12 back into the Fuel filter 6 flows and there flushes the filter material 8, so that the particular Dirt 10 accumulated on the dirt side of the filter material 8 triggers and arrives in the deposit tub 9 through appropriate precautions. The Flushing fuel 4 then flows through the inlet opening 11 Lines 5 via the fuel pump 2 to the suction point 19 in the fuel tank 3 back. The arrangement of the check valve 16 between the Branch 20 to the pressure accumulator 15 and the pressure regulator 17 is prevented that the line 21 to the engine 18 when flushing the fuel filter 6th emptied.
  • the second embodiment of the fuel system 1 shown in FIG. 2 differs from the first embodiment of the fuel system shown in FIG 1 in that the fuel filter 6 is arranged on the suction side.
  • Flow direction of the fuel 4 While in FIG. 1 the fuel system 1 with the engine 18 running, as shown by the arrows indicated flow direction of the fuel 4, the figure shows 2, the fuel system 1 after switching off the engine 18, in which the in the Pressure accumulator 15 fuel 4 via the fuel pump 2 and Fuel filter 6 flows back into the fuel tank 3, as is also the case Arrows is marked.
  • the fuel pump 2 sucks fuel 4 accordingly via the fuel filter 6 out of the fuel tank 3 and delivers this fuel 4 via Check valve 16 and a pressure regulator 17 to a motor 18. In addition a predetermined when the engine 18 or the fuel pump 2 is operating Amount of fuel 4 fed into the pressure accumulator 15.
  • a delay valve can be in the branch line 14 may be provided so that after starting the engine 18 the pressure accumulator 15 delayed with fuel 4 is filled.

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

Description

Die Erfindung betrifft eine Kraftstoffanlage für ein Kraftfahrzeug gemäß dem Oberbegriff des Anspruchs 1 und geht von der US 5,647,329 aus.The invention relates to a fuel system for a motor vehicle according to the preamble of claim 1 and is based on US 5,647,329.

Es sind bereits Kraftstoffanlagen für Kraftfahrzeuge bekannt, die mit einem Kraftstoff-Filter versehen sind, wobei der Kraftstoff-Filter innerhalb und/oder außerhalb eines Kraftstoffbehälters eingebaut sein kann. Diese Kraftstoff-Filter werden üblicherweise nur in einer Richtung durchströmt. Dadurch setzt sich an der Seite des Filters, an der der Kraftstoff in den Kraftstoff-Filter einströmt, im Lauf der Zeit immer mehr der im Kraftstoff enthaltene Schmutz ab. Bei einem hohen Schmutzanteil im Kraftstoff kann sich im Lauf der Zeit ein Filterkuchen bilden, der zu einer Erhöhung des Durchströmungswiderstandes führt. Dadurch steigt die Leistungsanforderung an eine in der Kraftstoffanlage befindliche Kraftstoffpumpe an.Fuel systems for motor vehicles with a Fuel filters are provided, the fuel filter being inside and / or can be installed outside of a fuel tank. This fuel filter are usually only flowed through in one direction. This sets in on the Side of the filter on which the fuel flows into the fuel filter, in the course of Waste the dirt contained in the fuel more and more. At a high A portion of the dirt in the fuel can form a filter cake over time leads to an increase in flow resistance. This increases the Performance requirement for a fuel pump located in the fuel system on.

Die eingangs genannte US 5,647,329 beschreibt eine im Kraftstoffbehälter eingebaute Kraftstoffpumpe mit einem Kraftstoff-Filter sowie mit einem Druckregler und einem zugeordneten Reservoir, wobei aus diesem Resevoir nach Abstellen der Kraftstoffpumpe bzw. des Kraftfahrzeug-Motors, zu welchem diese Kraftstoff-Pumpe den Kraftstoff fördert, Kraftstoff in entgegengesetzter Richtung strömen soll, um das Kraftstoff-Filter zu spülen. Dabei dürften jedoch aus dem Filter ausgespülte Schmutzpartikel in der Nähe des Filters verbleiben und bei neuerlichem Förder-Betrieb der Kraftstoffpumpe sofort wieder in das Filter angesaugt werden. Im übrigen dürfte bei diesem bekannten Stand der Technik das Spülen des Kraftstoff-Filters nur sehr eingeschränkt erfolgen, nachdem gemäß der detaillierten Beschreibung in der US 5,647,329 das sog. Reservoir innerhalb des Kraftstoffbehälters offen und somit drucklos ist. The above-mentioned US 5,647,329 describes one in the fuel tank built-in fuel pump with a fuel filter and a pressure regulator and an associated reservoir, from which reservoir after the Fuel pump or the motor vehicle engine to which this fuel pump promotes the fuel, fuel should flow in the opposite direction, to flush the fuel filter. However, rinsed out of the filter Dirt particles remain in the vicinity of the filter and during a new conveyor operation the fuel pump can be sucked back into the filter immediately. in the otherwise, the flushing of the fuel filter is likely in this known prior art done only very limited after following the detailed description in US 5,647,329 the so-called reservoir within the fuel tank is open and therefore depressurized.

Weiteren bekannten Stand der Technik bildet die DE 25 05 925 A, die ein Kraftstoff-Fördersystem mit einem druckbeaufschlagten Kraftstoffspeicher beschreibt, mit Hilfe dessen nach Stillsetzen der Kraftstoff-Pumpe der Druck im Kraftstoff-Fördersystem noch längere Zeit aufrechterhalten wird. Damit kann bspw. die dem Fachmann bekannte Heiss-Start-Problematik gelöst werden.Another known prior art is DE 25 05 925 A, which is a fuel delivery system with a pressurized fuel reservoir With the help of this, after the fuel pump has stopped, the pressure in the fuel delivery system is maintained for a long time. For example, the Hot start problems known to those skilled in the art can be solved.

Aufgabe der vorliegenden Erfindung ist es, eine Kraftstoffanlage für ein Kraftfahrzeug gemäß dem Oberbegriff des Anspruchs 1 zu schaffen, mit der ein Spülen des Kraftstoff-Filters derart wirksam durchgeführt wird, dass der Durchströmungswiderstand des Kraftstoff-Filters über der Laufzeit des Fahrzeuges nicht oder nur relativ gering ansteigt.
Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The object of the present invention is to provide a fuel system for a motor vehicle according to the preamble of claim 1, with which the fuel filter is flushed in such an effective manner that the flow resistance of the fuel filter does not or only relatively over the running time of the vehicle increases slightly.
This object is achieved by the characterizing features of claim 1.

Die erfindungsgemäße Kraftstoffanlage weist einen Kraftstoff-Filter auf, in dem eine Ablagerungswanne ausgebildet ist. Ferner ist in der Kraftstoffanlage ein Druckspeicher so eingebaut, daß sich der in dem Druckspeicher befindliche Kraftstoff nach dem Abstellen eines Motors des Kraftfahrzeuges entspannt und den Filter von der Kraftstoffaustrittsseite oder Reinseite zur Kraftstoffeintrittsseite oder Schmutzseite durchspült. Dadurch ergibt sich vorteilhafterweise, daß sich der auf der Kraftstoffeintrittsseite angesammelte Schmutz vom Filter löst und sich in der Ablagerungswanne sammelt.The fuel system according to the invention has a fuel filter in which a Deposit pan is formed. There is also a pressure accumulator in the fuel system installed so that the fuel in the pressure accumulator after the parking of an engine of the motor vehicle relaxes and the filter of the Fuel outlet side or clean side to the fuel inlet side or dirt side flushed. This advantageously results in that on the fuel inlet side Accumulated dirt loosens from the filter and settles in the deposit pan collects.

Vorteilhafterweise ist die erfindungsgemäße Ablagerungswanne durch einen Aufbau des Gehäuses, beispielsweise durch die Ausbildung von Leitschaufeln, so gestaltet, daß die Ablagerungswanne nicht von Kraftstoff durchströmt wird, so daß der abgelagerte Schmutz nicht aufgewirbelt wird.The deposit trough according to the invention is advantageously by a Structure of the housing, for example by the formation of guide vanes, so designed that the deposit pan is not flowed through by fuel, so that the deposited dirt is not whirled up.

Vorteilhafterweise kann der erfindungsgemäße Kraftstoff-Filter druckseitig oder saugseitig in der Kraftstoffanlage, d. h. hinter oder vor der Kraftstoffpumpe, angeordnet werden.The fuel filter according to the invention can advantageously on the pressure side or suction side in the fuel system, d. H. behind or in front of the fuel pump, to be ordered.

Bei einer vorteilhaften Ausführungsform ist in Richtung des Motors ein Druckspeicher bei einer druckseitigen Anordnung des Kraftstoff-Filters nach einer Austrittsöffnung des Filtergehäuses und bei einer saugseitigen Anordnung des Kraftstoff-Filters nach einer Austrittsöffnung der Kraftstoffpumpe und in beiden Fällen vor einem Druckregler mit einem vorgeschalteten Rückschlagventil eingebaut. Durch die Anordnung eines Rückschlagventils zwischen einer Abzweigung zum Druckspeicher und dem Druckregler wird verhindert, daß sich die zum Motor führende Leitung entleert.In an advantageous embodiment, is in the direction of the motor Pressure accumulator in a pressure-side arrangement of the fuel filter after a Outlet opening of the filter housing and the suction side arrangement of the Fuel filter after an outlet opening of the fuel pump and in both Cases before a pressure regulator with an upstream check valve built-in. By arranging a check valve between one Branch to the pressure accumulator and the pressure regulator prevents the line leading to the motor is emptied.

In einer vorteilhaften Ausführungsform ist ein Verzögerungsventil in der Kraftstoffanlage vorgesehen, um nach dem Starten des Motors den Druckaufbau in der Kraftstoffanlage nicht durch ein Auffüllen des Druckspeichers zu beeinflussen. In an advantageous embodiment, a delay valve is in the Fuel system provided to build up pressure after starting the engine not affect the fuel system by filling the pressure accumulator.

Durch die erfindungsgemäße Kraftstoffanlage ergibt sich vorteilhafterweise eine höhere Lebensdauer des Kraftstoff-Filters. Ferner ist es vorteilhaft, daß durch den erfindungsgemäßen Aufbau des Kraftstoff-Filters eine Verkleinerung des Filtervolumens im Vergleich mit einem bekannten Kraftstoff-Filter bei gleichbleibender Lebensdauer möglich ist.The fuel system according to the invention advantageously results in a longer service life of the fuel filter. It is also advantageous that the construction of the fuel filter according to the invention a reduction in the filter volume compared to a known fuel filter with the same Service life is possible.

Durch die Reinigung des Kraftstoff-Filters nach jedem Abschalten des Motors bleibt der Durchströmungswiderstand des Kraftstoff-Filters in etwa konstant. Dadurch muß die Kraftstoffpumpe der Kraftstoffanlage nur den normalen Druck und nicht einen erhöhten Druck wie bei einem sich verstopfenden Kraftstoff-Filter aufbringen, so daß die Lebensdauer der Kraftstoffpumpe höher ist im Vergleich zu Kraftstoffanlagen mit herkömmlichen Kraftstoff-Filtern.By cleaning the fuel filter after each engine shutdown remains the flow resistance of the fuel filter is approximately constant. This must the fuel pump of the fuel system only the normal pressure and not one Apply increased pressure as with a clogged fuel filter so that the lifespan of the fuel pump is longer compared to using fuel systems conventional fuel filters.

Von Vorteil ist ferner, daß der Kraftstoff-Filter, der Druckregler, die Kraftstoffpumpe, das Rückschlagventil, der Druckspeicher und ggf. der Schwalltopf als eine vormontierbare Einheit ausführbar ist, so daß sich die Anzahl der Dichtungsstellen erniedrigen und somit auch die Emissionen geringer sind.It is also advantageous that the fuel filter, the pressure regulator, the fuel pump, the check valve, the pressure accumulator and possibly the surge pot as one preassembled unit is executable, so that the number of sealing points lower and thus the emissions are lower.

Ausführungsformen der Erfindung werden nachstehend anhand der Zeichnungen beispielshalber beschrieben. Dabei zeigen:

Figur 1
eine Prinzipdarstellung einer Kraftstoffanlage, bei der der Kraftstoff-Filter druckseitig angeordnet ist und
Figur 2
eine Prinzipdarstellung einer Kraftstoffanlage, bei der der Kraftstoff-Filter saugseitig vorgesehen ist.
Embodiments of the invention are described below by way of example with reference to the drawings. Show:
Figure 1
a schematic diagram of a fuel system in which the fuel filter is arranged on the pressure side and
Figure 2
a schematic diagram of a fuel system in which the fuel filter is provided on the suction side.

Die Figur 1 zeigt eine erste Ausführungsform einer Kraftstoffanlage 1, bei der eine Kraftstoffpumpe 2 aus einem Kraftstoffbehälter 3, beispielsweise über einen nicht dargestellten Schwalltopf, Kraftstoff 4 über Leitungen 5 zu einem Kraftstoff-Filter 6 fördert. Der Kraftstoff-Filter 6 weist ein Gehäuse 7 auf, in dem ein Filtermaterial 8, beispielsweise Filtergewebe oder Filterpapier, angeordnet ist.FIG. 1 shows a first embodiment of a fuel system 1, in which one Fuel pump 2 from a fuel tank 3, for example via a not illustrated surge pot, fuel 4 via lines 5 to a fuel filter 6 promotes. The fuel filter 6 has a housing 7 in which a filter material 8, For example, filter cloth or filter paper is arranged.

Unterhalb des Filtermaterials 8 ist im Gehäuse 7 eine Ablagerungswanne 9 ausgebildet, die so angeordnet oder geschützt ist, daß der durch das Filtermaterial 8 strömende Kraftstoff 4 den in der Ablagerungswanne 9 sich ansammelnden Schmutz 10 nicht beeinflußt. Beispielsweise können im Gehäuse 7 Leitschaufeln oder Leitwände vorgesehen sein, die eine Aufwirbelung des in der Ablagerungswanne 9 sich befindlichen Schmutzes 10 durch die Kraftstoff-Strömung verhindern.Below the filter material 8 there is a deposit pan 9 in the housing 7 formed, which is arranged or protected so that the filter material by the 8th flowing fuel 4 that accumulates in the deposit pan 9 Dirt 10 not affected. For example, 7 guide vanes in the housing or baffles can be provided, which a whirling up in the Deposit pan 9 of dirt 10 due to the fuel flow prevent.

In der gezeigten Ausführungsform weist der Kraftstoff-Filter 6 am Gehäuse 7 mindestens eine Eintrittsöffnung 11 für den zu reinigenden Kraftstoff 4 und mindestens eine Austrittsöffnung 12 auf, aus der der gereinigte Kraftstoff 4 in eine Leitung 13 strömt. Das sich an die Eintrittsöffnung 11 anschließende Filtermaterial 8 verschmutzt am schnellsten, aus diesem Grund wird diese Seite des Filtermaterials 8 nachfolgend als Schmutzseite bezeichnet. Mit der Leitung 13 ist an einer Abzweigstelle 20 eine zu einem Druckspeicher 15 führende Leitung 14 verbunden. Der gereinigte Kraftstoff 4 strömt über ein Rückschlagventil 16 und einen sich daran anschließenden Druckregler 17 durch eine Leitung 21 zu einem Motor 18.In the embodiment shown, the fuel filter 6 has on the housing 7 at least one inlet opening 11 for the fuel to be cleaned 4 and at least one outlet opening 12 from which the cleaned fuel 4 into a Line 13 flows. The filter material 8 adjoining the inlet opening 11 Soiled the fastest, for this reason, this side of the filter material 8 hereinafter referred to as the dirt side. With the line 13 is at one Branch 20 connected to a line 14 leading to a pressure accumulator 15. The cleaned fuel 4 flows through a check valve 16 and one itself subsequent pressure regulator 17 through a line 21 to a motor 18.

Die Kraftstoffpumpe 2 fördert bei laufendem Motor 18 eine vorgegebene Menge an Kraftstoff 4 in den Druckspeicher 15, der beispielsweise als ein Membrandruckspeicher ausgebildet sein kann. Nach dem Abstellen des Motors 18 erfolgt eine Entspannung des Druckspeichers 15, so daß der in dem Druckspeicher 15 befindliche Kraftstoff 4 über die Leitung 13 und durch die Austrittsöffnung 12 zurück in den Kraftstoff-Filter 6 fließt und dort das Filtermaterial 8 durchspült, so daß sich der insbesondere auf der Schmutzseite des Filtermaterials 8 angesammelte Schmutz 10 löst und über entsprechende Vorkehrungen in die Ablagerungswanne 9 gelangt. Der zur Spülung dienende Kraftstoff 4 fließt dann über die Eintrittsöffnung 11, die Leitungen 5 über die Kraftstoffpumpe 2 zur Ansaugstelle 19 im Kraftstoffbehälter 3 zurück. Durch die Anordnung des Rückschlagventiles 16 zwischen der Abzweigstelle 20 zum Druckspeicher 15 und dem Druckregler 17 wird verhindert, daß sich die Leitung 21 zum Motor 18 bei der Spülung des Kraftstoff-Filters 6 entleert.The fuel pump 2 delivers a predetermined amount while the engine 18 is running Fuel 4 in the pressure accumulator 15, for example as a diaphragm pressure accumulator can be trained. After the engine 18 has been switched off, relaxation takes place of the pressure accumulator 15, so that the one located in the pressure accumulator 15 Fuel 4 via line 13 and through outlet 12 back into the Fuel filter 6 flows and there flushes the filter material 8, so that the particular Dirt 10 accumulated on the dirt side of the filter material 8 triggers and arrives in the deposit tub 9 through appropriate precautions. The Flushing fuel 4 then flows through the inlet opening 11 Lines 5 via the fuel pump 2 to the suction point 19 in the fuel tank 3 back. The arrangement of the check valve 16 between the Branch 20 to the pressure accumulator 15 and the pressure regulator 17 is prevented that the line 21 to the engine 18 when flushing the fuel filter 6th emptied.

Die zweite Ausführungsform der in der Figur 2 gezeigten Kraftstoffanlage 1 unterscheidet sich von der in der Figur 1 gezeigten ersten Ausführungsform der Kraftstoffanlage 1 dadurch, daß der Kraftstoff-Filter 6 saugseitig angeordnet ist. Ein weiterer Unterschied in den beiden Figuren besteht in der dargestellten Strömungsrichtung des Kraftstoffes 4. Während in der Figur 1 die Kraftstoffanlage 1 bei einem laufenden Motor 18 dargestellt ist, wie dies aus der durch Pfeile gekennzeichneten Strömungsrichtung des Kraftstoffes 4 hervorgeht, zeigt die Figur 2 die Kraftstoffanlage 1 nach dem Abstellen des Motors 18, bei dem der in dem Druckspeicher 15 befindliche Kraftstoff 4 über die Kraftstoffpumpe 2 und den Kraftstoff-Filter 6 in den Kraftstoffbehälter 3 zurückfließt, wie dies ebenfalls durch Pfeile gekennzeichnet ist.The second embodiment of the fuel system 1 shown in FIG. 2 differs differs from the first embodiment of the fuel system shown in FIG 1 in that the fuel filter 6 is arranged on the suction side. On Another difference in the two figures is that shown Flow direction of the fuel 4. While in FIG. 1 the fuel system 1 with the engine 18 running, as shown by the arrows indicated flow direction of the fuel 4, the figure shows 2, the fuel system 1 after switching off the engine 18, in which the in the Pressure accumulator 15 fuel 4 via the fuel pump 2 and Fuel filter 6 flows back into the fuel tank 3, as is also the case Arrows is marked.

Die Kraftstoffpumpe 2 saugt entsprechend über den Kraftstoff-Filter 6 Kraftstoff 4 aus dem Kraftstoffbehälter 3 und fördert diesen Kraftstoff 4 über ein Rückschlagventil 16 und einen Druckregler 17 zu einem Motor 18. Zusätzlich wird bei einem Betrieb des Motors 18 bzw. der Kraftstoffpumpe 2 eine vorgegebene Menge von Kraftstoff 4 in den Druckspeicher 15 gefördert.The fuel pump 2 sucks fuel 4 accordingly via the fuel filter 6 out of the fuel tank 3 and delivers this fuel 4 via Check valve 16 and a pressure regulator 17 to a motor 18. In addition a predetermined when the engine 18 or the fuel pump 2 is operating Amount of fuel 4 fed into the pressure accumulator 15.

Bei beiden Ausführungsformen kann ein Verzögerungsventil in der Abzweigleitung 14 vorgesehen sein, so daß nach einem Starten des Motors 18 der Druckspeicher 15 verzögert mit Kraftstoff 4 gefüllt wird.In both embodiments, a delay valve can be in the branch line 14 may be provided so that after starting the engine 18 the pressure accumulator 15 delayed with fuel 4 is filled.

Claims (7)

  1. A fuel system for a motor vehicle, comprising a tank (3) from which a pump (2) conveys fuel (4) from a suction point in the tank (3) through pipes (5) and a filter (6) towards an engine (18), whereas after the engine (18) has been switched off, a certain amount of fuel flushes the filter (6) In the opposite direction,
    characterised in that a trough (9) is formed under the filter material (8) in a casing (7) of the filter (6), dirt (10) filtered out of the fuel (4) is deposited in the trough when the filter (6) is flushed, and a pressure accumulator (15) for the amount of fuel used for flushing is incorporated in the fuel system (1).
  2. A fuel system according to claim 1, characterised in that when the engine (18) is running a part of the fuel (7) is conveyed by the pump (2) to the pressure accumulator (15) whereas after the engine (18) has been switched off the fuel (4) stored in the pressure accumulator (15) can flow through the filter (6) so that dirt (10) deposited in the filter material (8) is removed.
  3. A fuel system according to claim 1 or 2, characterised in that a non-return valve (16) is provided In a pipe (13) leading to the engine (18), behind a junction (20) at which a pipe (14) leads to the pressure accumulator (15).
  4. A fuel system according to any of the preceding claims, characterised in that a pressure regulator (17) is disposed near the non-return valve (16) in the direction of the engine (18).
  5. A fuel system according to any of the preceding claims, characterised in that the fuel filter (6) is connected to the pump (2) on the delivery side or the suction side.
  6. A fuel system according to any of the preceding claims, characterised in that a delay valve is incorporated in front of the pressure accumulator (15) so that there is a delay in filling the pressure accumulator (15) with fuel (4) after the engine (18) starts.
  7. A fuel system according to any of the preceding claims, characterised in that guide vanes or the like are provided in the casing (7) and prevent the fuel (4) flowing through the filter material (8) from coming into contact with or disturbing the dirt (10) accumulated in the trough (9).
EP00914091A 1999-03-12 2000-02-25 Fuel supply system for a motor vehicle Expired - Lifetime EP1078155B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19911068A DE19911068A1 (en) 1999-03-12 1999-03-12 Fuel system for a motor vehicle
DE19911068 1999-03-12
PCT/EP2000/001599 WO2000055489A1 (en) 1999-03-12 2000-02-25 Fuel supply system for a motor vehicle

Publications (2)

Publication Number Publication Date
EP1078155A1 EP1078155A1 (en) 2001-02-28
EP1078155B1 true EP1078155B1 (en) 2004-09-15

Family

ID=7900751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00914091A Expired - Lifetime EP1078155B1 (en) 1999-03-12 2000-02-25 Fuel supply system for a motor vehicle

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US (1) US6786085B1 (en)
EP (1) EP1078155B1 (en)
JP (1) JP2002539369A (en)
DE (2) DE19911068A1 (en)
WO (1) WO2000055489A1 (en)

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JP2013136951A (en) * 2011-12-28 2013-07-11 Denso Corp Fuel filter
JP5821770B2 (en) * 2012-04-26 2015-11-24 株式会社日本自動車部品総合研究所 Fuel supply device
CN103047227B (en) * 2012-12-20 2016-04-06 三一重型装备有限公司 Back-flushing filtering device and working surface hydraulic system
SE537487C2 (en) * 2013-09-04 2015-05-19 Scania Cv Ab Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method of dampening pressure fluctuations in a fuel system
JP6385794B2 (en) * 2014-10-24 2018-09-05 株式会社ミツバ Fuel supply system
CN107061426B (en) * 2017-06-22 2021-02-23 杭州力龙液压有限公司 Oil liquid filtering device and hydraulic equipment
KR20210049348A (en) * 2019-10-25 2021-05-06 현대자동차주식회사 Integrated fuel filter device for vehicle

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Also Published As

Publication number Publication date
JP2002539369A (en) 2002-11-19
DE50007749D1 (en) 2004-10-21
US6786085B1 (en) 2004-09-07
WO2000055489A1 (en) 2000-09-21
DE19911068A1 (en) 2000-09-14
EP1078155A1 (en) 2001-02-28

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