EP1078155A1 - Fuel supply system for a motor vehicle - Google Patents

Fuel supply system for a motor vehicle

Info

Publication number
EP1078155A1
EP1078155A1 EP00914091A EP00914091A EP1078155A1 EP 1078155 A1 EP1078155 A1 EP 1078155A1 EP 00914091 A EP00914091 A EP 00914091A EP 00914091 A EP00914091 A EP 00914091A EP 1078155 A1 EP1078155 A1 EP 1078155A1
Authority
EP
European Patent Office
Prior art keywords
fuel
filter
engine
pressure accumulator
fuel system
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
EP00914091A
Other languages
German (de)
French (fr)
Other versions
EP1078155B1 (en
Inventor
Hugo Kroiss
Christian Treml
Georg Wissenbach
Jürgen TURINI
Simon Lösch
Henning Bode
Michael Hofrichter
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
A Kayser Automotive Systems GmbH
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 Bayerische Motoren Werke AG, A Kayser Automotive Systems GmbH filed Critical Bayerische Motoren Werke AG
Publication of EP1078155A1 publication Critical patent/EP1078155A1/en
Application granted granted Critical
Publication of EP1078155B1 publication Critical patent/EP1078155B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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.
  • Fuel systems for motor vehicles are already known, which are provided with a fuel filter, wherein the fuel filter can be installed inside and / or outside a fuel tank. These fuel filters are only flowed through in one direction. As a result, the dirt contained in the fuel deposits more and more on the side of the filter where the fuel flows into the fuel filter. If there is a high proportion of dirt in the fuel, a filter cake can form over time, which leads to an increase in the flow resistance. This increases the power requirement for a fuel pump located in the fuel system.
  • the object of the invention is to provide a fuel system for a motor vehicle in which the flow resistance does not increase or only increases relatively little over the running time of the vehicle.
  • the fuel system according to the invention has a fuel filter in which a deposition trough is formed. Furthermore, a pressure accumulator is built into the fuel assembly so that the fuel in the pressure accumulator relaxes after the engine of the motor vehicle has been switched off and the filter from the fuel outlet side or clean side through to the fuel inlet side or dirt side. This advantageously results in the dirt that has accumulated on the fuel inlet side becoming detached from the filter and collecting in the deposit pan
  • the deposit trough according to the invention is designed by a structure of the housing, for example by the formation of guide vanes, so that fuel does not flow through the deposit trough, so that the deposited dirt is not whirled up.
  • the fuel filter according to the invention can advantageously be arranged on the pressure side or on the suction side in the fuel system, ie behind or in front of the fuel pump.
  • a pressure accumulator is installed in the direction of the engine when the fuel filter is arranged on the pressure side after the filter housing has been opened and when the fuel filter has been arranged on the suction side after the fuel pump has been opened and in both cases in front of a pressure regulator with an upstream check valve
  • the arrangement of a check valve between a branch to the pressure accumulator and the pressure regulator prevents the line leading to the engine from being emptied.
  • a delay valve is provided in the fuel system so that after the engine is started, the pressure build-up in the fuel system is not influenced by filling up 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 structure of the fuel filter according to the invention makes it possible to reduce the filter volume in comparison with a known fuel filter while maintaining the same service life.
  • the flow resistance of the fuel filter remains approximately constant.
  • the fuel pump of the fuel system only has to apply the normal pressure and not an increased pressure as in the case of a clogged fuel filter, so that the service life of the fuel pump is longer in comparison to fuel systems with conventional fuel filters.
  • the fuel filter, the pressure regulator, the fuel pump, the check valve, the pressure accumulator and possibly the swirl pot can be designed as a preassembled unit, so that the number of sealing points is reduced and thus the emissions are lower.
  • Figure 1 is a schematic diagram of a fuel system in which the fuel filter is arranged on the pressure side and
  • Figure 2 is a schematic diagram of a fuel system in which the fuel filter is provided on the suction side.
  • FIG. 1 shows a first embodiment of a fuel system 1, in which a fuel pump 2 from a fuel tank 3, for example via a baffle, not shown, 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 fabric or filter paper, is arranged.
  • a deposit pan 9 is formed in the housing 7, which is arranged or protected in such a way that the fuel 4 flowing through the filter material 8 does not influence the dirt 10 accumulating in the deposit pan 9.
  • guide vanes or guide walls can be provided in the housing 7, which prevent the dirt 10 located in the deposit pan 9 from being whirled up by the fuel flow.
  • the fuel filter 6 on the housing 7 has at least one inlet opening 11 for the fuel 4 to be cleaned and at least one outlet opening 12, from which the cleaned fuel 4 flows into a line 13.
  • the filter material 8 adjoining the inlet opening 11 becomes soiled the fastest, for this reason this side of the filter material 8 is referred to below as the dirt side.
  • a line 14 leading to a pressure accumulator 15 is connected to line 13 at a branch point 20.
  • the cleaned fuel 4 flows via a check valve 16 and an adjoining pressure regulator 17 through a line 21 to an engine 18.
  • the fuel pump 2 delivers a predetermined amount of fuel 4 into the pressure accumulator 15, which can be designed, for example, as a diaphragm pressure accumulator.
  • the pressure accumulator 15 is released, so that the fuel 4 located in the pressure accumulator 15 flows via the line 13 and through the outlet opening 12 back into the fuel filter 6 and rinses the filter material 8 there, so that the dirt 10 collected in particular on the dirt side of the filter material 8 dissolves and arrives in the deposit tub 9 by means of appropriate precautions.
  • the fuel 4 used for purging then flows back via the inlet opening 11, the lines 5 via the fuel pump 2 to the suction point 19 in the fuel tank 3.
  • the arrangement of the check valve 16 between the Junction 20 to the pressure accumulator 15 and the pressure regulator 17 prevents the line 21 to the engine 18 from being emptied when the fuel filter 6 is flushed.
  • the second embodiment of the fuel system 1 shown in FIG. 2 differs from the first embodiment of the fuel system 1 shown in FIG. 1 in that the fuel filter 6 is arranged on the suction side.
  • Another difference in the two figures is the flow direction of the fuel 4 shown. While in FIG. 1 the fuel system 1 is shown with the engine 18 running, as can be seen from the flow direction of the fuel 4 indicated by arrows, FIG Fuel system 1 after switching off the engine 18, in which the fuel 4 located in the pressure accumulator 15 flows back into the fuel tank 3 via the fuel pump 2 and the fuel filter 6, as is also indicated by arrows.
  • the fuel pump 2 correspondingly sucks fuel 4 out of the fuel tank 3 via the fuel filter 6 and delivers this fuel 4 to a motor 18 via a check valve 16 and a pressure regulator 17.
  • a predetermined value is set Amount of fuel 4 fed into the pressure accumulator 15.
  • a delay valve can be provided in the branch line 14, so that after starting the engine 18 the pressure accumulator 15 is filled with fuel 4 with a delay.

Landscapes

  • 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)

Abstract

A fuel supply system (1) for a motor vehicle is known in which the fuel flows through the fuel filter (6) of the fuel supply system in one direction only. In such a system, any sediments (10) that are present in the fuel are deposited on the filter material (8) so that the flow resistance of the filter material is gradually increasing. The aim of the invention is to provide a fuel supply system for a motor vehicle in which the flow resistance of the fuel filter remains virtually constant. To this end, a sedimentation pan (9) is provided in a housing of the fuel filter (6) below the filter material (8) which is mounted in the housing (7) in which pan the sediments (10) filtered off from the fuel (4) are deposited. An accumulator (15) is mounted in the fuel supply system that allows that the fuel (4) stored in the accumulator (15) scavenges the fuel filter (6) once the engine is switched off.

Description

Kraftstoffanlage für ein KraftfahrzeugFuel system for a motor vehicle
Die Erfindung betrifft eine Kraftstoffanlage für ein Kraftfahrzeug gemäß dem Ober- begriff des Anspruchs 1.The invention relates to a fuel system for a motor vehicle according to the preamble of claim 1.
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 immer 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 Filterkucheπ 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 are already known, which are provided with a fuel filter, wherein the fuel filter can be installed inside and / or outside a fuel tank. These fuel filters are only flowed through in one direction. As a result, the dirt contained in the fuel deposits more and more on the side of the filter where the fuel flows into the fuel filter. If there is a high proportion of dirt in the fuel, a filter cake can form over time, which leads to an increase in the flow resistance. This increases the power requirement for a fuel pump located in the fuel system.
Aufgabe der Erfindung ist es, eine Kraftstoffanlage für ein Kraftfahrzeug zu schaffen, bei der der Durchströmungswiderstand über der Laufzeit des Fahrzeuges nicht oder nur relativ gering ansteigt.The object of the invention is to provide a fuel system for a motor vehicle in which the flow resistance does not increase or only increases relatively little over the running time of the vehicle.
Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst. Die erfindungsgemaße Kraftstoffanlage weist einen Kraftstoff-Filter auf, in dem eine Ablagerungswanne ausgebildet ist Ferner ist in der Kraftstoffaπiage 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 durchspult Dadurch ergibt sich vorteilhafterweise, daß sich der auf der Kraftstoffeintrittsseite angesammelte Schmutz vom Filter lost und sich in der Abiagerungs- wanne sammeltThis object is solved by the features of claim 1. The fuel system according to the invention has a fuel filter in which a deposition trough is formed. Furthermore, a pressure accumulator is built into the fuel assembly so that the fuel in the pressure accumulator relaxes after the engine of the motor vehicle has been switched off and the filter from the fuel outlet side or clean side through to the fuel inlet side or dirt side. This advantageously results in the dirt that has accumulated on the fuel inlet side becoming detached from the filter and collecting in the deposit pan
Vorteilhafterweise ist die erfindungsgemaße 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.Advantageously, the deposit trough according to the invention is designed by a structure of the housing, for example by the formation of guide vanes, so that fuel does not flow through the deposit trough, so that the deposited dirt is not whirled up.
Vorteilhafterweise kann der erfindungsgemaße 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 be arranged on the pressure side or on the suction side in the fuel system, ie behind or in front of the fuel pump.
Bei einer vorteilhaften Ausfuhrungsform ist in Richtung des Motors ein Druckspeicher bei einer druckseitigen Anordnung des Kraftstoff-Filters nach einer Austπttsoffnung des Filtergehauses und bei einer saugseitigen Anordnung des Kraftstoff-Filters nach einer Austnttsoffnung der Kraftstoffpumpe und in beiden Fallen 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 fuhrende Leitung entleert.In an advantageous embodiment, a pressure accumulator is installed in the direction of the engine when the fuel filter is arranged on the pressure side after the filter housing has been opened and when the fuel filter has been arranged on the suction side after the fuel pump has been opened and in both cases in front of a pressure regulator with an upstream check valve The arrangement of a check valve between a branch to the pressure accumulator and the pressure regulator prevents the line leading to the engine from being emptied.
In einer vorteilhaften Ausfuhrungsform ist ein Verzogerungsventil in der Kraftstoffanlage vorgesehen, um nach dem Starten des Motors den Druckaufbau in der Kraftstoffanlage nicht durch ein Auffüllen des Druckspeichers zu beeinflussen 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 Filtervolu- mens im Vergleich mit einem bekannten Kraftstoff-Filter bei gleichbleibender Lebensdauer möglich ist.In an advantageous embodiment, a delay valve is provided in the fuel system so that after the engine is started, the pressure build-up in the fuel system is not influenced by filling up 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 structure of the fuel filter according to the invention makes it possible to reduce the filter volume in comparison with a known fuel filter while maintaining the same service life.
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 each time the engine is switched off, the flow resistance of the fuel filter remains approximately constant. As a result, the fuel pump of the fuel system only has to apply the normal pressure and not an increased pressure as in the case of a clogged fuel filter, so that the service life of the fuel pump is longer in comparison to fuel systems with 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 swirl pot can be designed as a preassembled unit, so that the number of sealing points is reduced and thus the emissions are lower.
Ausführungsformen der Erfindung werden nachstehend anhand der Zeichnungen beispielshalber beschrieben. Dabei zeigen:Embodiments of the invention are described below by way of example with reference to the drawings. Show:
Figur 1 eine Prinzipdarstellung einer Kraftstoffanlage, bei der der Kraftstoff-Filter druckseitig angeordnet ist undFigure 1 is a schematic diagram of a fuel system in which the fuel filter is arranged on the pressure side and
Figur 2 eine Prinzipdarstellung einer Kraftstoffanlage, bei der der Kraftstoff-Filter saugseitig vorgesehen ist.Figure 2 is 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 a fuel pump 2 from a fuel tank 3, for example via a baffle, not shown, 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 fabric 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, a deposit pan 9 is formed in the housing 7, which is arranged or protected in such a way that the fuel 4 flowing through the filter material 8 does not influence the dirt 10 accumulating in the deposit pan 9. For example, guide vanes or guide walls can be provided in the housing 7, which prevent the dirt 10 located in the deposit pan 9 from being whirled up by the fuel flow.
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 on the housing 7 has at least one inlet opening 11 for the fuel 4 to be cleaned and at least one outlet opening 12, from which the cleaned fuel 4 flows into a line 13. The filter material 8 adjoining the inlet opening 11 becomes soiled the fastest, for this reason this side of the filter material 8 is referred to below as the dirt side. A line 14 leading to a pressure accumulator 15 is connected to line 13 at a branch point 20. The cleaned fuel 4 flows via a check valve 16 and an adjoining pressure regulator 17 through a line 21 to an engine 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 Ent- Spannung 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 1 1 , 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 Druckregier 17 wird verhindert, daß sich die Leitung 21 zum Motor 18 bei der Spülung des Kraftstoff-Filters 6 entleert.When the engine 18 is running, the fuel pump 2 delivers a predetermined amount of fuel 4 into the pressure accumulator 15, which can be designed, for example, as a diaphragm pressure accumulator. After switching off the engine 18, the pressure accumulator 15 is released, so that the fuel 4 located in the pressure accumulator 15 flows via the line 13 and through the outlet opening 12 back into the fuel filter 6 and rinses the filter material 8 there, so that the dirt 10 collected in particular on the dirt side of the filter material 8 dissolves and arrives in the deposit tub 9 by means of appropriate precautions. The fuel 4 used for purging then flows back via the inlet opening 11, the lines 5 via the fuel pump 2 to the suction point 19 in the fuel tank 3. The arrangement of the check valve 16 between the Junction 20 to the pressure accumulator 15 and the pressure regulator 17 prevents the line 21 to the engine 18 from being emptied when the fuel filter 6 is flushed.
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 Kraftstoffaniage 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 from the first embodiment of the fuel system 1 shown in FIG. 1 in that the fuel filter 6 is arranged on the suction side. Another difference in the two figures is the flow direction of the fuel 4 shown. While in FIG. 1 the fuel system 1 is shown with the engine 18 running, as can be seen from the flow direction of the fuel 4 indicated by arrows, FIG Fuel system 1 after switching off the engine 18, in which the fuel 4 located in the pressure accumulator 15 flows back into the fuel tank 3 via the fuel pump 2 and the fuel filter 6, as is also indicated by arrows.
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 correspondingly sucks fuel 4 out of the fuel tank 3 via the fuel filter 6 and delivers this fuel 4 to a motor 18 via a check valve 16 and a pressure regulator 17. In addition, when the motor 18 or the fuel pump 2 is operating, a predetermined value is set 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 provided in the branch line 14, so that after starting the engine 18 the pressure accumulator 15 is filled with fuel 4 with a delay.

Claims

Patentansprüche claims
1. Kraftstoffanlage für ein Kraftfahrzeug, mit einem Kraftstoffbehälter, aus dem eine Kraftstoffpumpe über Leitungen Kraftstoff von einer Ansaugstelle im1. Fuel system for a motor vehicle, with a fuel tank from which a fuel pump via fuel lines from an intake point in the
Kraftstoffbehälter über einen Kraftstoff-Filter in Richtung eines Motors fördert, dadurch gekennzeichnet, daß in einem Gehäuse (7) des Kraftstoff-Filters (6) unterhalb eines im Gehäuse (7) befindlichen Filtermaterials (8) eine Ablagerungswanne (9) ausgebildet ist, in der sich ein aus dem Kraftstoff (4)ausgefil- terter Schmutz (10) ablagert und daß in der Kraftstoffanlage (1) einFuel tank via a fuel filter in the direction of an engine, characterized in that a deposit pan (9) is formed in a housing (7) of the fuel filter (6) below a filter material (8) located in the housing (7), in a dirt (10) filtered out of the fuel (4) is deposited and that in the fuel system (1)
Druckspeicher (15) eingebaut ist, der bewirkt, daß nach dem Abstellen des Motors (18) der in dem Druckspeicher (15) gespeicherte Kraftstoff (4) den Kraftstoff-Filter (6) spült.Pressure accumulator (15) is installed, which causes the fuel (4) stored in the pressure accumulator (15) to flush the fuel filter (6) after the engine (18) has been switched off.
2. Kraftstoffanlage nach Anspruch 1 , dadurch gekennzeichnet, daß über die Kraftstoffpumpe (2) eine Teilmenge des Kraftstoffes (4) bei laufendem Motor (18) in den Druckspeicher (15) förderbar ist und daß nach dem Abstellen des Motors (18) der in dem Druckspeicher (15) gespeicherte Kraftstoff (4) so durch den Kraftstoff-Filter (6) strömen kann, daß ein im Filtermaterial (8) abgelagerter Schmutz (10) entfernt wird. Kraftstoffanlage nach den Ansprüchen 1 oder 2 dadurch gekennzeichnet, daß in einer zum Motor (18) fuhrenden Leitung (13) nach einer Abzweigstelle (20), an der eine zu dem Druckspeicher (15) fuhrende Leitung (14) angeordnet ist, ein Rückschlagventil (16) vorgesehen ist2. Fuel system according to claim 1, characterized in that via the fuel pump (2) a subset of the fuel (4) while the engine (18) in the pressure accumulator (15) is deliverable and that after turning off the engine (18) in fuel (4) stored in the pressure accumulator (15) can flow through the fuel filter (6) in such a way that a dirt (10) deposited in the filter material (8) is removed. Fuel system according to claims 1 or 2, characterized in that in a line (13) leading to the engine (18) after a branch point (20) at which a line (14) leading to the pressure accumulator (15) is arranged, a check valve ( 16) is provided
Kraftstoffanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß an das Rückschlagventil (16) in Richtung des Motors (18) ein Druckregler (17) angeordnet istFuel system according to one of the preceding claims, characterized in that a pressure regulator (17) is arranged on the check valve (16) in the direction of the engine (18)
Kraftstoffanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Kraftstoff-Filter (6) druckseitig oder saugseitig an der Kraftstoffpumpe (2) angeschlossen istFuel system according to one of the preceding claims, characterized in that the fuel filter (6) is connected to the fuel pump (2) on the pressure side or on the suction side
Kraftstoffanlage nach einem der vorhergehenden Ansprüche, dadurch ge- kennzeichnet, daß ein Verzogerungsventil vor dem Druckspeicher (15) eingebaut ist, so daß nach dem Starten des Motors (18) der Druckspeicher (15) verzögert mit Kraftstoff (4) gefüllt wirdFuel system according to one of the preceding claims, characterized in that a delay valve is installed upstream of the pressure accumulator (15), so that after the engine (18) is started, the pressure accumulator (15) is filled with fuel (4) with a delay
Kraftstoffanlage nach einem der vorhergehenden Ansprüche, dadurch ge- kennzeichnet, daß in dem Gehäuse (7) Leitschaufeln oder dergleichen vorgesehen sind, die verhindern, daß der durch das Filtermateπal (8) durchströmende Kraftstoff (4) den in der Ablagerungswanne (9) gesammelten Schmutz (10) berührt oder aufwirbelt Fuel system according to one of the preceding claims, characterized in that guide vanes or the like are provided in the housing (7), which prevent the fuel (4) flowing through the filter material (8) from collecting the dirt collected in the deposit pan (9) (10) touches or whirls up
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 true EP1078155A1 (en) 2001-02-28
EP1078155B1 EP1078155B1 (en) 2004-09-15

Family

ID=7900751

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EP00914091A Expired - Lifetime EP1078155B1 (en) 1999-03-12 2000-02-25 Fuel supply system for a motor vehicle

Country Status (5)

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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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Also Published As

Publication number Publication date
JP2002539369A (en) 2002-11-19
DE50007749D1 (en) 2004-10-21
WO2000055489A1 (en) 2000-09-21
EP1078155B1 (en) 2004-09-15
DE19911068A1 (en) 2000-09-14
US6786085B1 (en) 2004-09-07

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