EP1552133B1 - Fuel supply system for an internal combustion engine - Google Patents

Fuel supply system for an internal combustion engine Download PDF

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Publication number
EP1552133B1
EP1552133B1 EP03756474A EP03756474A EP1552133B1 EP 1552133 B1 EP1552133 B1 EP 1552133B1 EP 03756474 A EP03756474 A EP 03756474A EP 03756474 A EP03756474 A EP 03756474A EP 1552133 B1 EP1552133 B1 EP 1552133B1
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EP
European Patent Office
Prior art keywords
supply system
fuel supply
activated
valve
air
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Expired - Fee Related
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EP03756474A
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German (de)
French (fr)
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EP1552133A1 (en
Inventor
Stephan Von Andrian-Werburg
Klaus Wunderlich
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Daimler AG
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DaimlerChrysler AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/089Layout of the fuel vapour installation

Definitions

  • the invention relates to a fuel supply system for an internal combustion engine according to the preamble of claim 1.
  • a fuel supply system of the aforementioned type is known from DE 199 47 080 C1, in which, based on a working with air-assisted direct injection internal combustion engine, a regeneration of the activated carbon container is provided with pressure purge.
  • a pressure pump pressure source is associated with a pressure regulator, and it is supplied via the pressure regulator branched excess amount for regeneration of the activated carbon container.
  • the air flushing through the activated carbon canister, laden with hydrocarbons, is returned to the air supply channel via a regeneration valve adjacent to the inlet module.
  • the invention has for its object to form a fuel supply system of the type mentioned in that this allows both a purge of the activated carbon canister with overpressure as well as negative pressure, thus with respect to the implementation of the regeneration of operating conditions of the internal combustion engine and this associated pressure sources is independent and thereby , without or with only minor modifications, in connection with differently operated internal combustion engines, such as with or without supercharger working internal combustion engines is to be used.
  • a fuel supply system which when designed for operation with a supply side to the engine pressure source, and thus possible pressure flushing of the activated carbon container, also allows operation in which the activated carbon container is purged with negative pressure.
  • connection connection of the fuel tank to the atmosphere and the branch from the air supply channel in each case in the feed to the activated carbon container valve-controlled and alternately unlocked for ventilation of the fuel tank and the regeneration of the activated carbon container, which - with a simple structure - in blocking the branch against the activated carbon container via the activated carbon container running, valve-controlled connection connection of the fuel tank to the atmosphere and via the recirculated to the inlet module portion of the branch, in which the regeneration valve is located, allows a purge with negative pressure.
  • Other relevant possibilities arise in particular when using a controlled valve, in particular a Proportional valves in the output of the connection connection to the atmosphere.
  • connection connection of the fuel tank to the atmosphere and the inlet side, opening onto the activated carbon container section of the branch from the air supply system is preferably made according to the invention via a common directional control valve, wherein the directional control valve is designed as a 4/2-way valve in particular.
  • a common directional control valve wherein the directional control valve is designed as a 4/2-way valve in particular.
  • a 4/3-way valve can be used, as a further position Has blocked position with respect to all connections, so that the activated carbon container is shut off both against the tank as well as against the outgoing from the inlet module section of the branch and sucked for flushing of the activated carbon container air takes place exclusively via the connection connection of the activated carbon container to the atmosphere.
  • 1 denotes an internal combustion engine, here an internal combustion engine operating with spark ignition, to which an outlet module 2 and an inlet module 3 are assigned and to whose inlet module 3 a fuel supply system 4 connects, which comprises a fuel tank 5 and an activated carbon container 6.
  • a throttle valve 7 is assigned on the input side, in connection with the throttle valve 7 standing, an air supply channel 8, in which the pressure source 9 is a loader, which is associated with a circulating valve 11 in a bypass 10.
  • the pressure source 9 is a loader, which is associated with a circulating valve 11 in a bypass 10.
  • an air mass meter 12 which is preferably designed as a hot-film air mass meter.
  • a branch 13 which includes sections 14, 15 and 16, and of which the section 14 connects to a directional control valve 17 formed here as a 4/2-way valve
  • the Directional control valve 17 is in transition to the portion 15 of the branch 13, which is connected to the activated carbon container 6, from which the portion 16 goes out, in which a 2/2-way valve is arranged as Regenerierventil 18 and the subsequent to the regeneration valve 18 on the Inlet module 3, preferably adjacent to one or more of the intake ports of the internal combustion engine 1, opens.
  • the air mass meter may also be arranged upstream of the pressure source within the scope of the invention, since the entire air mass is thus also detected insofar as the loader is not assigned a blow-off valve.
  • the activated carbon container 6 is associated with a connecting line 19 to the atmosphere, wherein in the connecting line 19, in simplified terms, a blocking in the direction of the atmosphere check valve 20 is located.
  • a connection connection 21 is provided to the fuel tank 5 to the fuel tank 6, which runs through the directional control valve 17, wherein the directional control valve 17 has two switching positions, in one of the basic position, the connection connection 21 between the fuel tank 5 and activated carbon canister 6 is switched on, while interrupting the connection between the sections 14 and 15 of the branch 13, and in the second, via an actuator switched switching position, the connection of the fuel tank 5 is interrupted to the activated carbon container 6 and the sections 14 and 15 of Branch 13 are connected.
  • the regeneration valve 18 is shown in its first, forming a basic position switching position in which the connection over the portion 16 of the branch 13 is interrupted is and switchable via an actuator to a second switching position in which this connection is open.
  • the check valve 20 may be formed in the context of the invention as a controlled valve.
  • the described structure of the fuel supply system 4 illustrates that the flushing and thus the regeneration of the activated carbon container 6 can be carried out both with overpressure and underpressure, and thus in its function also independent of the operation of the supercharger as a pressure source 9, whereby the suitability for internal combustion engines 1 is given, which work with switchable charger.
  • the system for example in the context of vehicle series with different engine configurations, can be used with the same and, if appropriate, adaptation in a leaner design, so that a small number of parts results despite varying application conditions.
  • the fuel supply system 4 is operated with positive pressure in relation to the regeneration of the activated carbon container 6, the fresh air sucked in via the supercharger as pressure source 9 is compacted to a slight extent by slightly closing the circulating air valve 11, before it reaches via the air mass meter 12 of the internal combustion engine 1 via the throttle valve 7 flows.
  • Part of the precompressed air is branched off between the air mass meter 12 and the throttle valve 7 from the air supply channel 8 and fed to the activated carbon container 6 via the section 14 of the branch 13, the directional valve 17 connected to the switching position 2 for regeneration and the line section 15.
  • the supply to the inlet module 3, wherein the relevant connection preferably opens in the region of the intake ports of the internal combustion engine 1 to use the given there vacuum.
  • the opening angle of the throttle valve 7 is reduced accordingly, and thus compensates for the additional supplied, enriched with hydrocarbons purge stream.
  • the lambda shift can be directly applied to the load state of the activated carbon container during regeneration 6, so that, in view of the very short response times, the loading state of the activated carbon container 6 does not need to be detected in advance or in a regeneration phase and taken into account with regard to its contribution to the mixing ratio.
  • the branch 13 is shut off at the described flushing of the activated carbon container 6 with overpressure on the check valve 20, on the, due to the pre-described construction in the shown, the basic position corresponding switching position 1 of the directional control valve 17, the ventilation of the fuel tank 5 outside the phases the regeneration takes place.
  • the illustrated basic structure of the fuel supply system 4 further also allows a purge with negative pressure at inactive pressure source 9 taking advantage of the slope between the upstream of the throttle valve 7 (air supply channel 8) and upstream to the intake ports of the intake module 3 (section 16 of the branch 13) given Pressure exists.
  • the directional control valve 17 is switched to its second switching position, in which the fuel tank 5 is shut off against the activated carbon container 6, so that there is no negative pressure of the fuel tank 5.
  • valve 20 in the connection line 19 as a switched valve is expedient, so that even for the flushing with negative pressure, the entire, the internal combustion engine 1 inlet supplied amount of air passes over the air mass meter 12.
  • the first switching position of the directional control valve 17 corresponds to the use of such a switched valve 20 outside the regeneration phases a preferably pressure-dependent switched and / or adjusting opening position against the atmosphere, so that the fuel tank 5 is ventilated as needed via the activated carbon canister 5.

Description

Die Erfindung betrifft ein Kraftstoffversorgungssystem für eine Brennkraftmaschine gemäß dem Oberbegriff des Anspruches 1.The invention relates to a fuel supply system for an internal combustion engine according to the preamble of claim 1.

Ein Kraftstoffversorgungssystem der vorgenannten Art ist aus der DE 199 47 080 C1 bekannt, bei der, bezogen auf eine mit luftunterstützter Direkteinspritzung arbeitende Brennkraftmaschine, eine Regeneration des Aktivkohlebehälters mit Druckspülung vorgesehen ist. Hierzu ist der für die luftunterstützte Direkteinspritzung vorgesehenen, durch eine Druckpumpe gebildeten Druckquelle ein Druckregler zugeordnet, und es wird die über den Druckregler abgezweigte Überschussmenge zur Regeneration dem Aktivkohlebehälter zugeführt. Die den Aktivkohlebehälter durchspülende Luft wird, mit Kohlewasserstoffen beladen, über ein Regenerierventil benachbart zum Einlassmodul auf den Luftversorgungskanal zurückgeführt. Eine derartige Lösung ermöglicht über die der Brennkraftmaschine abgasseitig zugeordnete Lambda-Sonde zwar die Berücksichtigung der durch die Regeneration des Aktivkohlebehälters zusätzlich eingeleiteten Kohlenwasserstoffe bei der Bestimmung der Einspritzmengen, ist aber für die Regeneration an die druckbeaufschlagte Durchspülung des Aktivkohlebehälters, und damit an eine mit Überschuss arbeitende Druckpumpe, gebunden.A fuel supply system of the aforementioned type is known from DE 199 47 080 C1, in which, based on a working with air-assisted direct injection internal combustion engine, a regeneration of the activated carbon container is provided with pressure purge. For this purpose, provided for the air-assisted direct injection, formed by a pressure pump pressure source is associated with a pressure regulator, and it is supplied via the pressure regulator branched excess amount for regeneration of the activated carbon container. The air flushing through the activated carbon canister, laden with hydrocarbons, is returned to the air supply channel via a regeneration valve adjacent to the inlet module. Although such a solution allows the lambda probe, which is additionally exhaust gas-fed by the regeneration of the activated charcoal container, to be determined by the regeneration of the activated charcoal canister in the determination of the injection quantities, it is suitable for the regeneration of the pressurized flushing of the activated charcoal container, and thus to an excessively working one Pressure pump, tied.

Der Erfindung liegt die Aufgabe zugrunde, ein Kraftstoffversorgungssystem der eingangs genannten Art dahingehend auszubilden, dass dieses sowohl eine Spülung des Aktivkohlebehälters mit Überdruck wie auch mit Unterdruck ermöglicht, somit bezüglich der Durchführung der Regeneration von Betriebszuständen der Brennkraftmaschine und dieser zugeordneten Druckquellen unabhängig ist und dadurch auch, ohne oder mit nur geringen Modifikationen, in Verbindung mit unterschiedlich betriebenen Brennkraftmaschinen, so beispielsweise mit oder ohne Lader arbeitenden Brennkraftmaschinen einzusetzen ist.The invention has for its object to form a fuel supply system of the type mentioned in that this allows both a purge of the activated carbon canister with overpressure as well as negative pressure, thus with respect to the implementation of the regeneration of operating conditions of the internal combustion engine and this associated pressure sources is independent and thereby , without or with only minor modifications, in connection with differently operated internal combustion engines, such as with or without supercharger working internal combustion engines is to be used.

Erreicht wird dies gemäß der Erfindung durch ein Kraftstoffversorgungssystem gemäß dem Anspruch 1, das bei Auslegung auf einen Betrieb mit einer versorgungsseitig zur Brennkraftmaschine vorgesehenen Druckquelle, und damit möglicher Druckspülung des Aktivkohlebehälters, auch einen Betrieb ermöglicht, bei dem der Aktivkohlebehälter mit Unterdruck gespült wird. Hierzu ist bei dem erfindungsgemäßen Kraftstoffversorgungssystem die Anschlussverbindung des Kraftstofftanks zur Atmosphäre und die Abzweigung vom Luftversorgungskanal jeweils im Zulauf auf den Aktivkohlebehälter ventilgesteuert sowie zur Belüftung des Kraftstofftanks und zur Regeneration des Aktivkohlebehälters wechselweise freigeschaltet, was - bei einfachem Aufbau - bei Sperrung der Abzweigung gegen den Aktivkohlebehälter über die über den Aktivkohlebehälter laufende, ventilgesteuerte Anschlussverbindung des Kraftstofftanks zur Atmosphäre und über den auf das Einlassmodul zurückgeführten Abschnitt der Abzweigung, in dem das Regenerierventil liegt, eine Spülung mit Unterdruck ermöglicht. Weitere diesbezügliche Möglichkeiten ergeben sich insbesondere bei Verwendung eines gesteuerten Ventiles, insbesondere eines Proportionalventiles im Ausgang der Anschlussverbindung auf die Atmosphäre.This is achieved according to the invention by a fuel supply system according to claim 1, which when designed for operation with a supply side to the engine pressure source, and thus possible pressure flushing of the activated carbon container, also allows operation in which the activated carbon container is purged with negative pressure. For this purpose, in the fuel supply system according to the invention, the connection connection of the fuel tank to the atmosphere and the branch from the air supply channel in each case in the feed to the activated carbon container valve-controlled and alternately unlocked for ventilation of the fuel tank and the regeneration of the activated carbon container, which - with a simple structure - in blocking the branch against the activated carbon container via the activated carbon container running, valve-controlled connection connection of the fuel tank to the atmosphere and via the recirculated to the inlet module portion of the branch, in which the regeneration valve is located, allows a purge with negative pressure. Other relevant possibilities arise in particular when using a controlled valve, in particular a Proportional valves in the output of the connection connection to the atmosphere.

In Verbindung mit Ladermotoren erweist es sich als zweckmäßig, für den Lader einen Bypass vorzusehen, der durch leichtes Schließen des zugehörigen Umluftventiles eine verringerte Verdichtung ermöglicht, so dass für die Regeneration auch dann mit einem bezogen auf den Saugrohrdruck bevorzugt geringen Überdruck - beispielsweise bis in die Größenordnung von 150 mbar - für die Spülung des Aktivkohlebehälters gearbeitet werden kann, wenn, ungeachtet der Auslegung des Laders auf brennkraftmaschinenseitig geforderte maximale Ladedrücke, die Spülung des Aktivkohlebehälters und dessen Regeneration in Betriebsphasen der Brennkraftmaschine erfolgt, in denen motorseitig nur geringe Ladedrücke gewünscht und erforderlich sind.In conjunction with supercharger engines, it proves to be useful to provide for the loader a bypass that allows by slightly closing the associated recirculation valve a reduced compression, so that for the regeneration with respect to the intake manifold pressure preferably low pressure - for example into the Magnitude of 150 mbar - can be used for flushing the activated carbon container, regardless of the design of the supercharger on the internal combustion engine required maximum boost pressures, the purge of the activated carbon container and its regeneration takes place in operating phases of the internal combustion engine in which only small boost pressures are desired and required on the engine side ,

Für die Anordnung des Laders erweist es sich als zweckmäßig, diesen stromauf des Luftmassenmessers vorzusehen, wobei im Rahmen der Erfindung bevorzugt mit einem mechanischen Lader gearbeitet wird.For the arrangement of the loader, it proves to be expedient to provide this upstream of the air mass meter, being preferably used in the invention with a mechanical supercharger.

Die wechselweise Freischaltung der Anschlussverbindung des Kraftstoffbehälters zur Atmosphäre und des zulaufseitigen, auf den Aktivkohlebehälter mündenden Abschnittes der Abzweigung vom Luftversorgungssystem wird erfindungsgemäß bevorzugt über ein gemeinsames Wegeventil vorgenommen, wobei das Wegeventil als 4/2-Wegeventil insbesondere ausgebildet wird. Eine solche vereinfachte Lösung ist auch bei Spülung mit Unterdruck und zum Kraftstofftank offener Verbindung des Aktivkohlebehälters ohne Gefährdung des Kraftstofftanks durch hohe Unterdruckbelastung im Regelfall möglich. Im Rahmen der Erfindung kann aber auch ein 4/3-Wegeventil Verwendung finden, das als weitere Stellung eine Sperrlage hinsichtlich aller Anschlüsse aufweist, so dass der Aktivkohlebehälter sowohl gegen den Tank wie auch gegen den vom Einlassmodul ausgehenden Abschnitt der Abzweigung abgesperrt ist und die zur Spülung des Aktivkohlebehälters angesaugte Luft ausschließlich über die Anschlussverbindung des Aktivkohlebehälters zur Atmosphäre erfolgt.The alternate activation of the connection connection of the fuel tank to the atmosphere and the inlet side, opening onto the activated carbon container section of the branch from the air supply system is preferably made according to the invention via a common directional control valve, wherein the directional control valve is designed as a 4/2-way valve in particular. Such a simplified solution is also possible with flushing with negative pressure and the fuel tank open connection of the activated carbon container without endangering the fuel tank by high negative pressure load as a rule. In the context of the invention, however, a 4/3-way valve can be used, as a further position Has blocked position with respect to all connections, so that the activated carbon container is shut off both against the tank as well as against the outgoing from the inlet module section of the branch and sucked for flushing of the activated carbon container air takes place exclusively via the connection connection of the activated carbon container to the atmosphere.

Weitere Einzelheiten und Merkmale der Erfindung ergeben sich aus den Ansprüchen. Ferner wird die Erfindung nachstehend anhand eines schematisierten Ausführungsbeispieles näher erläutert, das eine Brennkraftmaschine mit zugeordnetem erfindungsgemäßem Kraftstoffversorgungssystem zeigt.Further details and features of the invention will become apparent from the claims. Furthermore, the invention will be explained in more detail below with reference to a schematic embodiment showing an internal combustion engine with an associated fuel supply system according to the invention.

In der Zeichnung ist mit 1 eine Brennkraftmaschine, hier eine mit Fremdzündung arbeitende Brennkraftmaschine bezeichnet, der ein Auslassmodul 2 und ein Einlassmodul 3 zugeordnet sind und an deren Einlassmodul 3 ein Kraftstoffversorgungssystem 4 anschließt, das einen Kraftstofftank 5 und einen Aktivkohlebehälter 6 umfasst. An das Einlassmodul 3, dem im Ausführungsbeispiel eine Drosselklappe 7 eingangsseitig zugeordnet ist, schließt, in Verbindung zur Drosselklappe 7 stehend, ein Luftversorgungskanal 8 an, in dem als Druckquelle 9 ein Lader liegt, dem in einem Bypass 10 ein Umluftventil 11 zugeordnet ist. In Durchströmungsrichtung auf das Einlassmodul 3 liegt nachgeordnet zur Druckquelle 9, also stromab der Druckquelle 9 im Luftversorgungskanal 8 ein Luftmassenmesser 12, der bevorzugt als Heißfilm-Luftmassenmesser ausgebildet ist. Zwischen dem Luftmassenmesser 12 und dem Anschluss des Luftversorgungskanales 8 an das Einlassmodul 3 liegt der Anschluss für eine Abzweigung 13, die Abschnitte 14, 15 und 16 umfasst, und von denen der Abschnitt 14 an ein hier als 4/2-Wegeventil ausgebildetes Wegeventil 17 anschließt. Das Wegeventil 17 liegt im Übergang auf den Abschnitt 15 der Abzweigung 13, der an den Aktivkohlebehälter 6 angeschlossen ist, von dem der Abschnitt 16 ausgeht, in dem als Regenerierventil 18 ein 2/2-Wegeventil angeordnet ist und der anschließend an das Regenerierventil 18 auf das Einlassmodul 3, bevorzugt benachbart zu einem oder mehreren der Saugkanäle der Brennkraftmaschine 1, ausmündet. Grundsätzlich kann der Luftmassenmesser im Rahmen der Erfindung auch stromauf der Druckquelle angeordnet sein, da auch so die gesamte Luftmasse erfasst wird, sofern dem Lader kein Abblaseventil zugeordnet ist.In the drawing, 1 denotes an internal combustion engine, here an internal combustion engine operating with spark ignition, to which an outlet module 2 and an inlet module 3 are assigned and to whose inlet module 3 a fuel supply system 4 connects, which comprises a fuel tank 5 and an activated carbon container 6. To the inlet module 3, which in the embodiment, a throttle valve 7 is assigned on the input side, in connection with the throttle valve 7 standing, an air supply channel 8, in which the pressure source 9 is a loader, which is associated with a circulating valve 11 in a bypass 10. In the direction of flow on the inlet module 3 is downstream of the pressure source 9, that is, downstream of the pressure source 9 in the air supply channel 8, an air mass meter 12, which is preferably designed as a hot-film air mass meter. Between the air mass meter 12 and the connection of the air supply duct 8 to the inlet module 3 is the connection for a branch 13, which includes sections 14, 15 and 16, and of which the section 14 connects to a directional control valve 17 formed here as a 4/2-way valve , The Directional control valve 17 is in transition to the portion 15 of the branch 13, which is connected to the activated carbon container 6, from which the portion 16 goes out, in which a 2/2-way valve is arranged as Regenerierventil 18 and the subsequent to the regeneration valve 18 on the Inlet module 3, preferably adjacent to one or more of the intake ports of the internal combustion engine 1, opens. In principle, the air mass meter may also be arranged upstream of the pressure source within the scope of the invention, since the entire air mass is thus also detected insofar as the loader is not assigned a blow-off valve.

Parallel geschaltet zum Abschnitt 15 der Abzweigung 13 ist dem Aktivkohlebehälter 6 eine Anschlussleitung 19 zur Atmosphäre zugeordnet, wobei in der Anschlussleitung 19, vereinfacht dargestellt, ein in Richtung auf die Atmosphäre sperrendes Rückschlagventil 20 liegt. Parallel geschaltet zum vom Aktivkohlebehälter 6 ausgehenden Abschnitt 16 der Abzweigung 13 ist an den Aktivkohlebehälter 6 eine Anschlussverbindung 21 zum Kraftstofftank 5 vorgesehen, die über das Wegeventil 17 läuft, wobei das Wegeventil 17 zwei Schaltstellungen aufweist, in deren einer als Grundstellung die Anschlussverbindung 21 zwischen Kraftstofftank 5 und als Aktivkohlebehälter 6 durchgeschaltet ist, bei gleichzeitiger Unterbrechung der Verbindung zwischen den Abschnitten 14 und 15 der Abzweigung 13, und in deren zweiter, über ein Stellglied geschalteter Schaltstellung die Verbindung des Kraftstofftankes 5 zum Aktivkohlebehälter 6 unterbrochen ist und die Abschnitte 14 und 15 der Abzweigung 13 verbunden sind.Parallel to the section 15 of the branch 13, the activated carbon container 6 is associated with a connecting line 19 to the atmosphere, wherein in the connecting line 19, in simplified terms, a blocking in the direction of the atmosphere check valve 20 is located. Connected in parallel to the outgoing from the activated carbon container 6 section 16 of the branch 13, a connection connection 21 is provided to the fuel tank 5 to the fuel tank 6, which runs through the directional control valve 17, wherein the directional control valve 17 has two switching positions, in one of the basic position, the connection connection 21 between the fuel tank 5 and activated carbon canister 6 is switched on, while interrupting the connection between the sections 14 and 15 of the branch 13, and in the second, via an actuator switched switching position, the connection of the fuel tank 5 is interrupted to the activated carbon container 6 and the sections 14 and 15 of Branch 13 are connected.

Das Regenerierventil 18 ist in seiner ersten, eine Grundstellung bildenden Schaltstellung gezeigt, in der die Verbindung über den Abschnitt 16 der Abzweigung 13 unterbrochen ist und über ein Stellglied auf eine zweite Schaltstellung umschaltbar, in der diese Verbindung geöffnet ist.The regeneration valve 18 is shown in its first, forming a basic position switching position in which the connection over the portion 16 of the branch 13 is interrupted is and switchable via an actuator to a second switching position in which this connection is open.

Das Rückschlagventil 20 kann im Rahmen der Erfindung auch als gesteuertes Ventil ausgebildet sein kann.The check valve 20 may be formed in the context of the invention as a controlled valve.

Der geschilderte Aufbau des Kraftstoffversorgungssystemes 4 veranschaulicht, dass die Spülung und damit die Regeneration des Aktivkohlebehälters 6 sowohl mit Überdruck als auch mit Unterdruck erfolgen kann, und damit in seiner Funktion auch unabhängig vom Betrieb des Laders als Druckquelle 9 ist, womit die Eignung auch für Brennkraftmaschinen 1 gegeben ist, die mit zuschaltbarem Lader arbeiten. Ferner kann dadurch das System, beispielsweise im Rahmen von Fahrzeugbaureihen mit unterschiedlicher Motorenbestückung, bei gleichem und in Anpassung gegebenenfalls abgemagertem Aufbau eingesetzt werden, so dass sich eine geringe Teilevielfalt trotz variierender Einsatzgegebenheiten ergibt.The described structure of the fuel supply system 4 illustrates that the flushing and thus the regeneration of the activated carbon container 6 can be carried out both with overpressure and underpressure, and thus in its function also independent of the operation of the supercharger as a pressure source 9, whereby the suitability for internal combustion engines 1 is given, which work with switchable charger. Furthermore, the system, for example in the context of vehicle series with different engine configurations, can be used with the same and, if appropriate, adaptation in a leaner design, so that a small number of parts results despite varying application conditions.

Wird das Kraftstoffversorgungssystem 4 in Bezug auf die Regeneration des Aktivkohlebehälters 6 mit Überdruck betrieben, so wird die über den Lader als Druckquelle 9 angesaugte Frischluft durch leichtes Schließen des Umluftventiles 11 in geringem Umfang verdichtet, bevor sie über den Luftmassenmesser 12 der Brennkraftmaschine 1 über die Drosselklappe 7 zufließt. Ein Teil der vorverdichteten Luft wird zwischen Luftmassenmesser 12 und Drosselklappe 7 vom Luftversorgungskanal 8 abgezweigt und über den Abschnitt 14 der Abzweigung 13, das für die Regeneration in die Schaltstellung 2 geschaltete Wegeventil 17 sowie den Leitungsabschnitt 15 dem Aktivkohlebehälter 6 zugeführt. Nach Durchströmen des Aktivkohlebehälters 6 erfolgt über den Abschnitt 16 der Abzweigung 13 bei auf seine zweite Schaltstellung geschaltetem Regenerierventil 18 die Zuführung auf das Einlassmodul 3, wobei der diesbezügliche Anschluss bevorzugt im Bereich der Saugkanäle der Brennkraftmaschine 1 ausmündet, um den dort gegebenen Unterdruck zu nutzen.If the fuel supply system 4 is operated with positive pressure in relation to the regeneration of the activated carbon container 6, the fresh air sucked in via the supercharger as pressure source 9 is compacted to a slight extent by slightly closing the circulating air valve 11, before it reaches via the air mass meter 12 of the internal combustion engine 1 via the throttle valve 7 flows. Part of the precompressed air is branched off between the air mass meter 12 and the throttle valve 7 from the air supply channel 8 and fed to the activated carbon container 6 via the section 14 of the branch 13, the directional valve 17 connected to the switching position 2 for regeneration and the line section 15. After flowing through the activated carbon container 6 via the section 16 of the branch 13 with switched to its second switching position Regenerierventil 18, the supply to the inlet module 3, wherein the relevant connection preferably opens in the region of the intake ports of the internal combustion engine 1 to use the given there vacuum.

Um in der Phase der Regeneration die der Brennkraftmaschine 1 zugeführte Luftmasse, bezogen auf den jeweiligen Betriebspunkt, konstant zu halten, wird der Öffnungswinkel der Drosselklappe 7 entsprechend reduziert, und damit der zusätzliche zugeführte, mit Kohlenwasserstoffen angereicherte Spülstrom kompensiert.In order to keep the internal combustion engine 1 supplied air mass in the phase of regeneration, based on the respective operating point, constant, the opening angle of the throttle valve 7 is reduced accordingly, and thus compensates for the additional supplied, enriched with hydrocarbons purge stream.

In Anbetracht dessen, dass die gesamte über den Luftversorgungskanal 8 laufende Luftmasse vom Luftmassenmesser 12 erfasst wird und abgasseitig dem Auslassmodul 2 eine Lambda-Sonde 22 zur Erfassung der Abgaszusammensetzung zugeordnet ist, kann bei der Regeneration durch die Lambda-Verschiebung direkt auf den Beladungszustand des Aktivkohlebehälters 6 geschlossen werden, so dass, in Anbetracht der sehr kurzen Ansprechzeiten, der Beladungszustand des Aktivkohlebehälters 6 nicht vorab in oder zu einer Regenerierphase erfasst und hinsichtlich seines Beitrages zum Mischungsverhältnis berücksichtigt werden muss. Gegen die Atmosphäre ist die Abzweigung 13 bei der geschilderten Durchspülung des Aktivkohlebehälters 6 mit Überdruck über das Rückschlagventil 20 abgesperrt, über das, aufgrund des vorgeschilderten Aufbaus, in der gezeigten, der Grundstellung entsprechenden Schaltstellung 1 des Wegeventils 17 die Belüftung des Kraftstofftanks 5 außerhalb der Phasen der Regenerierung erfolgt.In view of the fact that the entire air mass passing through the air supply duct 8 is detected by the air mass meter 12 and the exhaust module 2 is assigned a lambda sensor 22 for detecting the exhaust gas composition, the lambda shift can be directly applied to the load state of the activated carbon container during regeneration 6, so that, in view of the very short response times, the loading state of the activated carbon container 6 does not need to be detected in advance or in a regeneration phase and taken into account with regard to its contribution to the mixing ratio. Against the atmosphere, the branch 13 is shut off at the described flushing of the activated carbon container 6 with overpressure on the check valve 20, on the, due to the pre-described construction in the shown, the basic position corresponding switching position 1 of the directional control valve 17, the ventilation of the fuel tank 5 outside the phases the regeneration takes place.

Der gezeigte Grundaufbau des Kraftstoffversorgungssystems 4 ermöglicht des Weiteren auch eine Spülung mit Unterdruck bei inaktiver Druckquelle 9 unter Ausnutzung des Gefälles, das zwischen dem anströmseitig zur Drosselklappe 7 (Luftversorgungskanal 8) und anströmseitig zu den Saugkanälen des Einlassmodules 3 (Abschnitt 16 der Abzweigung 13) gegebenen Druck besteht. In Verbindung mit der zweiten Schaltstellung des Regenerierventiles 18 zur Durchführung der Regeneration ist das Wegeventil 17 in seine zweite Schaltstellung geschaltet, in der der Kraftstofftank 5 gegen den Aktivkohlebehälter 6 abgesperrt ist, so dass sich keine Unterdruckbeaufschlagung des Kraftstoffbehälters 5 ergibt. Insbesondere in Verbindung mit einer derartigen Lösung ist eine Ausgestaltung des Ventiles 20 in der Anschlussleitung 19 als geschaltetes Ventil zweckmäßig, so dass auch für die Spülung mit Unterdruck die gesamte, der Brennkraftmaschine 1 einlassseitig zugeführte Luftmenge über den Luftmassenmesser 12 läuft. Der ersten Schaltstellung des Wegeventiles 17 entspricht bei Verwendung eines solchen geschalteten Ventiles 20 außerhalb der Phasen der Regeneration eine bevorzugt druckabhängig geschaltete und/oder sich einstellende Öffnungsstellung gegen die Atmosphäre, so dass der Kraftstofftank 5 über den Aktivkohlebehälter 5 bedarfsweise beatmet ist.The illustrated basic structure of the fuel supply system 4 further also allows a purge with negative pressure at inactive pressure source 9 taking advantage of the slope between the upstream of the throttle valve 7 (air supply channel 8) and upstream to the intake ports of the intake module 3 (section 16 of the branch 13) given Pressure exists. In conjunction with the second switching position of the regeneration valve 18 for carrying out the regeneration, the directional control valve 17 is switched to its second switching position, in which the fuel tank 5 is shut off against the activated carbon container 6, so that there is no negative pressure of the fuel tank 5. Particularly in connection with such a solution, an embodiment of the valve 20 in the connection line 19 as a switched valve is expedient, so that even for the flushing with negative pressure, the entire, the internal combustion engine 1 inlet supplied amount of air passes over the air mass meter 12. The first switching position of the directional control valve 17 corresponds to the use of such a switched valve 20 outside the regeneration phases a preferably pressure-dependent switched and / or adjusting opening position against the atmosphere, so that the fuel tank 5 is ventilated as needed via the activated carbon canister 5.

Claims (15)

  1. Fuel supply system for an internal combustion engine (1), in which the fuel supply system (4) comprises a fuel tank (5), an activated-carbon canister (6), an inlet module (3) on the internal combustion engine side, an air supply duct (8) leading to the inlet module (3), and an air-mass meter (12) arranged in the air supply duct and also has a valve-controlled connection of the fuel tank (5) to the atmosphere running via the activated-carbon canister (6) and, downstream of the air-mass meter (12), a branch (13) from the air supply duct (8), which branch, acted on via a pressure source (9), is guided back to the inlet module (3) via the activated-carbon canister (6) and in which branch a mechanically operated regenerating valve (18) is arranged downstream of the activated-carbon canister (6), characterized in that the connection (21) of the fuel tank (5) to the atmosphere and the branch (13) from the air supply duct (8) are in each case valve-controlled at the transition to the activated-carbon canister (6) and are activated alternately for ventilation of the fuel tank (5) and for regeneration of the activated-carbon canister (6).
  2. Fuel supply system according to Claim 1, characterized in that the pressure source (9) is assigned to the air supply duct (8) upstream of the air-mass meter (12).
  3. Fuel supply system according to Claim 1, characterized in that the pressure source (9) is assigned to the air supply duct (8) downstream of the air-mass meter (12).
  4. Fuel supply system according to one of Claims 1 to 3, characterized in that a supercharger is provided as the pressure source (9).
  5. Fuel supply system according to Claim 4, characterized in that the pressure source (9) is assigned a bypass (10) with a recirculating valve (11).
  6. Fuel supply system according to Claim 4 or 5, characterized in that the pressure source (9) is formed by a mechanical supercharger.
  7. Fuel supply system according to Claim 4 or 5, characterized in that the pressure source (9) is formed by the compressor of an exhaust gas turbocharger.
  8. Fuel supply system according to one of the preceding claims, characterized in that the connection (21) of the fuel tank (5) to the activated-carbon canister (6) and the branch (13) from the air supply duct (8) to the activated-carbon canister (6) are controlled together via a directional control valve (17).
  9. Fuel supply system according to Claim 8, characterized in that a 4/2-way valve is provided as the directional control valve (17).
  10. Fuel supply system according to Claim 8, characterized in that a 4/3-way valve is provided as the directional control valve (17).
  11. Fuel supply system according to one of the preceding claims, characterized in that a non-return valve (20) is provided for the connection (connecting line 21) of the fuel tank (5) to the atmosphere.
  12. Fuel supply system according to one of Claims 1 to 10, characterized in that a mechanically operated valve, in particular a directional control valve, is provided in the connection of the activated-carbon canister (6) to the atmosphere.
  13. Fuel supply system according to Claim 12, characterized in that the mechanically operated valve is closed during regeneration of the activated-carbon canister (6) with negative pressure.
  14. Fuel supply system according to one of the preceding claims, characterized in that the entire air mass flow supplied to the internal combustion engine, including the flushing air quantity, is guided via the lambda probe (22).
  15. Fuel supply system according to Claim 14, characterized in that the loading of the activated-carbon filter (6) is detected via the lambda probe (22) during flushing by means of negative pressure or positive pressure.
EP03756474A 2002-10-15 2003-10-02 Fuel supply system for an internal combustion engine Expired - Fee Related EP1552133B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10247936 2002-10-15
DE10247936A DE10247936A1 (en) 2002-10-15 2002-10-15 Fuel supply system for an internal combustion engine
PCT/EP2003/010916 WO2004036023A1 (en) 2002-10-15 2003-10-02 Fuel supply system for an internal combustion engine

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EP1552133A1 EP1552133A1 (en) 2005-07-13
EP1552133B1 true EP1552133B1 (en) 2006-04-19

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US (1) US7044112B2 (en)
EP (1) EP1552133B1 (en)
JP (1) JP2006503212A (en)
DE (2) DE10247936A1 (en)
WO (1) WO2004036023A1 (en)

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Also Published As

Publication number Publication date
EP1552133A1 (en) 2005-07-13
DE10247936A1 (en) 2004-04-29
JP2006503212A (en) 2006-01-26
WO2004036023A1 (en) 2004-04-29
US20050199223A1 (en) 2005-09-15
US7044112B2 (en) 2006-05-16
DE50303057D1 (en) 2006-05-24

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