EP0865571B1 - Adsorption filter for the fuel tank venting system of an internal combustion engine and process for operating said system - Google Patents

Adsorption filter for the fuel tank venting system of an internal combustion engine and process for operating said system Download PDF

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Publication number
EP0865571B1
EP0865571B1 EP97926982A EP97926982A EP0865571B1 EP 0865571 B1 EP0865571 B1 EP 0865571B1 EP 97926982 A EP97926982 A EP 97926982A EP 97926982 A EP97926982 A EP 97926982A EP 0865571 B1 EP0865571 B1 EP 0865571B1
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EP
European Patent Office
Prior art keywords
housing
adsorption filter
adsorption
filter
fuel tank
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP97926982A
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German (de)
French (fr)
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EP0865571A1 (en
Inventor
Matthias Bohl
Harald Haufe
Klaus Schweikert
Kay Brodesser
Uwe Mohr
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Knecht Filterwerk GmbH
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Knecht Filterwerk GmbH
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Priority claimed from DE1996123740 external-priority patent/DE19623740A1/en
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    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-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
    • F02M25/0809—Judging failure of purge control system
    • F02M25/0818—Judging failure of purge control system having means for pressurising the evaporative emission space
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-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
    • F02M25/0854—Details of the absorption canister

Definitions

  • the invention relates to an adsorption filter of a fuel tank ventilation system an internal combustion engine the preamble of claim 1 and a method to operate this system.
  • the filter as such is off, for example DE 41 24 465 A1 known.
  • the invention is concerned with of building such a filter with the problem, the individual Aggregates of the fuel tank ventilation system as compact, efficient to manufacture and easy to attach to the tank as well as the intake air line of the internal combustion engine To design module part.
  • the teaching of claim 6 ensures that by in the intake line of the internal combustion engine, through which Adsorption filter-led air the engine combustion process not negatively affected.
  • an adsorption filter housing 1 In an adsorption filter housing 1 are through a partition 2 a larger and a smaller chamber for receiving of activated carbon as an adsorbent for fuel vapors a tank, not shown, of an internal combustion engine educated.
  • the smaller chamber is 3 and the larger one Chamber labeled 4.
  • the two chambers 3 and 4 are vertically above and below with permeable covers 5 and 6 closed, being on the covered by the activated carbon opposite sides of the covers 5 and 6 each for training a flow channel a distance from one adjacent wall of the filter housing 1 is given. Perpendicular below is this flow space between the smaller and the larger chamber 3 or 4 separated by the partition 2.
  • the flow channel lying vertically above the upper cover 6 is from an intermediate wall 7 of the filter housing 1 educated.
  • the partition 7 is together with an area the outer wall of the filter housing 1 also an additional one separate flow channel 8 is formed.
  • connection piece 9 For the connection of a tank ventilation line is in the Larger chamber 4 leading connecting piece 9 is provided. Via the mouth of this connection piece leading into the activated carbon 9, a sieve basket 10 is put over.
  • Another one Connection piece 11 is the larger chamber 4 with a Engine operation under vacuum area of the intake air line of the internal combustion engine connectable. The last one said connection can be interrupted by a valve.
  • a connecting piece 12 leading to the atmosphere is located connected to one with the adsorption filter housing 1 Air filter housing 13. Sits in the air filter housing 13 an annular air filter 14, the radially outer one Area with the connecting line 12 to the atmosphere and its radially inner area with the flow channel 8 is connected.
  • a housing is directly connected to the filter housing 1 a compressed air source 15, this compressed air source specifically is an air pump.
  • the connection of the housing of the Compressed air source 15 is in the interior of the filter housing 1 leading connecting lines 16 and 17 given. Within these connecting lines are each the housing of the Compressed air source 15 from the filter housing 1 vibration-decoupling Intermediate elements 18.
  • the connecting line 17 leads from the pressure side of the compressed air source 15 out into a flow space 19 which is connected to that of the larger one Chamber 4 downstream end of the smaller chamber 3 adjacent.
  • a shutoff valve 20 provided, in particular at the transition from Housing of the compressed air source 15 is arranged to this line can be.
  • the compressed air source is located via the connecting line 16 15 on the suction side with the flow channel 8 in connection.
  • Fuel vapor flowing out of a tank, not shown passes through the connecting line 9 in the with activated carbon filled larger chamber 4 of the adsorption filter housing 1.
  • the chamber 4 leaves the one pre-treated there Fuel vapor in the direction of the smaller one too Activated carbon filled chamber 3, which he in the flow space 19 flows through.
  • From there the fuel passes freed tank ventilation flow via the supply and discharge lines 17 and 16 the compressed air source 15 to through the Flow space 8 through the air filter 14 through the Connection piece 12 to get into the atmosphere.
  • the compressed air source 15 is for this flow guidance of the tank ventilation flow permeable design.
  • the tank ventilation system can carry out leakage safety checks overall by the compressed air source 15 below Pressure.
  • the area to be pressurized lies between the connecting piece 11 and the connecting line 17 who did not conduct the test shown valves are closable and includes the the connecting piece 9 connected not shown Fuel tank.
  • the compressed air is directly inside the housing the compressed air source designed as a compressed air pump 15 generated and introduced via line 17 into the system.
  • the compressed air source 15 sucks the one to be compressed Air via the connecting line 16 from the air filter housing 13 on.
  • the exact type of leak test the tank ventilation system is known per se and therefore needs it no further explanation here.
  • a one-way valve 21 with locking action be arranged in the direction of the fuel tank.
  • the air flow that is generated by the Air pump 15 is conveyed through the filter 1, depending on the relevant engine operating data, the Exhaust gas composition and / or the fuel load state of the adsorption material of the filter 1 controlled or regulated.

Description

Die Erfindung betrifft ein Adsorptions-Filter einer Kraftstofftank-Entlüftungsanlage eines Verbrennungsmotors nach dem Oberbegriff des Patentanspruchs 1 sowie ein Verfahren zum Betreiben dieser Anlage.The invention relates to an adsorption filter of a fuel tank ventilation system an internal combustion engine the preamble of claim 1 and a method to operate this system.

Das Filter als solches ist beispielsweise aus DE 41 24 465 A1 bekannt.The filter as such is off, for example DE 41 24 465 A1 known.

Hiervon ausgehend beschäftigt sich die Erfindung bezüglich des Aufbaus eines solchen Filters mit dem Problem, die einzelnen Aggregate der Kraftstofftank-Entlüftungsanlage als kompaktes, rationell zu fertigendes und einfach an den Tank sowie die Ansaugluftleitung des Verbrennungsmotors montierbares Modulteil zu gestalten.Proceeding from this, the invention is concerned with of building such a filter with the problem, the individual Aggregates of the fuel tank ventilation system as compact, efficient to manufacture and easy to attach to the tank as well as the intake air line of the internal combustion engine To design module part.

Gelöst wird dieser Teil der Aufgabe durch eine Ausführung des Adsorptions-Filters nach den kennzeichnenden Merkmalen des Patentanspruchs 1. This part of the task is solved by an execution of the adsorption filter according to the characteristic features of claim 1.

Vorteilhafte Ausgestaltungen dieser Ausführung zeigen die Unteransprüche auf.Advantageous embodiments of this embodiment show the Subclaims.

Zu dem Problem, mit dem sich die Erfindung beschäftigt, gehört weiterhin, bei Motoren, bei denen kein ausreichender Unterdruck - aus welchen Gründen auch immer - in der Ansaugluftleitung während des Motorbetriebes herrscht, dennoch ein sicheres Regenerieren des Adsorptionsmaterials zu gewährleisten.One of the problems with which the invention is concerned further, for engines where there is insufficient Vacuum - for whatever reason - in the intake air line prevails during engine operation, nevertheless to ensure safe regeneration of the adsorption material.

Gelöst wird dieses den Betrieb der erfindungsgemäßen Einrichtung betreffende Problem durch ein Verfahren mit den kennzeichnenden Merkmalen des Patentanspruchs 1.This is solved by the operation of the device according to the invention problem by proceeding with the characterizing features of claim 1.

Es ist zwar bereits aus DE 26 01 044 A1 und DE 25 47 065 A1 bekannt, ein Adsorptions-Filter mit Luft aus einer Druckluftquelle zu regenerieren. Jene Einrichtungen und Verfahren betreffen jedoch Sonderfälle, die mit dem Betreiben einer Anlage, auf die sich die vorliegende Erfindung bezieht, nicht vergleichbar sind.Although it is already from DE 26 01 044 A1 and DE 25 47 065 A1 known an adsorption filter with air from a compressed air source to regenerate. Those facilities and procedures however, concern special cases that involve the operation of a Plant to which the present invention relates are not comparable.

Zweckmäßige Ausgestaltungen sind Gegenstand der weiteren Ansprüche.Appropriate configurations are the subject of the further claims.

Die Lehre des Anspruchs 6 sorgt dafür, daß durch in die Ansaugleitung des Verbrennungsmotors eingepumpte, durch das Adsorptions-Filter geführte Luft das Motor-Verbrennungsverfahren nicht negativ beeinflußt.The teaching of claim 6 ensures that by in the intake line of the internal combustion engine, through which Adsorption filter-led air the engine combustion process not negatively affected.

Ein Ausführungsbeispiel der Erfindung ist in der einzigen Fig. 1 der Zeichnung schematisch dargestellt.An embodiment of the invention is in the only one Fig. 1 of the drawing is shown schematically.

In einem Adsorptions-Filtergehäuse 1 sind durch eine Trennwand 2 eine größere und eine kleinere Kammer zur Aufnahme von Aktivkohle als Adsorptions-Mittel für Kraftstoffdämpfe eines nicht dargestellten Tankes eines Verbrennungsmotors ausgebildet. Die kleinere Kammer ist mit 3 und die größere Kammer mit 4 bezeichnet. Die beiden Kammern 3 und 4 sind lotrecht oben und unten mit durchlässigen Abdeckungen 5 und 6 verschlossen, wobei auf den von der abgedeckten Aktivkohle abgewandten Seiten der Abdeckungen 5 und 6 jeweils zur Ausbildung eines Strömungskanals ein Abstand gegenüber einer angrenzenden Wand des Filtergehäuses 1 gegeben ist. Lotrecht unten ist dieser Strömungsraum zwischen der kleineren und der größeren Kammer 3 bzw. 4 durch die Zwischenwand 2 getrennt.In an adsorption filter housing 1 are through a partition 2 a larger and a smaller chamber for receiving of activated carbon as an adsorbent for fuel vapors a tank, not shown, of an internal combustion engine educated. The smaller chamber is 3 and the larger one Chamber labeled 4. The two chambers 3 and 4 are vertically above and below with permeable covers 5 and 6 closed, being on the covered by the activated carbon opposite sides of the covers 5 and 6 each for training a flow channel a distance from one adjacent wall of the filter housing 1 is given. Perpendicular below is this flow space between the smaller and the larger chamber 3 or 4 separated by the partition 2.

Der lotrecht oberhalb der oberen Abdeckung 6 liegende Strömungskanal ist von einer Zwischenwand 7 des Filtergehäuses 1 gebildet. Von der Zwischenwand 7 wird zusammen mit einem Bereich der Außenwand des Filtergehäuses 1 auch noch ein zusätzlicher separater Strömungskanal 8 gebildet. The flow channel lying vertically above the upper cover 6 is from an intermediate wall 7 of the filter housing 1 educated. The partition 7 is together with an area the outer wall of the filter housing 1 also an additional one separate flow channel 8 is formed.

Für den Anschluß einer Tankentlüftungsleitung ist ein in die größere Kammer 4 führender Anschlußstutzen 9 vorgesehen. Über die in die Aktivkohle führende Mündung dieses Anschlußstutzens 9 ist ein Siebkorb 10 gestülpt. Über einen weiteren Anschlußstutzen 11 ist die größere Kammer 4 mit einem bei Motorbetrieb unter Unterdruck stehenden Bereich der Ansaugluftleitung des Verbrennungsmotors verbindbar. Die zuletzt genannte Verbindung ist durch ein Ventil unterbrechbar.For the connection of a tank ventilation line is in the Larger chamber 4 leading connecting piece 9 is provided. Via the mouth of this connection piece leading into the activated carbon 9, a sieve basket 10 is put over. Another one Connection piece 11 is the larger chamber 4 with a Engine operation under vacuum area of the intake air line of the internal combustion engine connectable. The last one said connection can be interrupted by a valve.

Ein zur Atmosphäre führender Anschlußstutzen 12 befindet sich an einem mit dem Adsorptions-Filtergehäuse 1 verbundenen Luftfiltergehäuse 13. In dem Luftfiltergehäuse 13 sitzt ein ringförmiges Luftfilter 14, dessen radial außen liegender Bereich mit der Anschlußleitung 12 zur Atmosphäre und dessen radial innen liegender Bereich mit dem Strömungskanal 8 verbunden ist.A connecting piece 12 leading to the atmosphere is located connected to one with the adsorption filter housing 1 Air filter housing 13. Sits in the air filter housing 13 an annular air filter 14, the radially outer one Area with the connecting line 12 to the atmosphere and its radially inner area with the flow channel 8 is connected.

An das Filtergehäuse 1 direkt angebunden ist ein Gehäuse mit einer Druckluftquelle 15, wobei diese Druckluftquelle speziell eine Luftpumpe ist. Die Anbindung des Gehäuses der Druckluftquelle 15 ist über in das Innere des Filtergehäuses 1 führende Verbindungsleitungen 16 und 17 gegeben. Innerhalb dieser Verbindungsleitungen sind jeweils das Gehäuse der Druckluftquelle 15 von dem Filtergehäuse 1 schwingungsentkoppelnde Elemente 18 zwischengeschaltet. Die Verbindungsleitung 17 führt von der Druckseite der Druckluftquelle 15 aus in einen Strömungsraum 19, der an das von der größeren Kammer 4 strömungsseitig entfernte Ende der kleineren Kammer 3 angrenzt. In der Verbindungsleitung 17 ist ein Verschlußventil 20 vorgesehen, das insbesondere an dem Übergang des Gehäuses der Druckluftquelle 15 zu dieser Leitung angeordnet sein kann. Über die Verbindungsleitung 16 steht die Druckluftquelle 15 saugseitig mit dem Strömungskanal 8 in Verbindung.A housing is directly connected to the filter housing 1 a compressed air source 15, this compressed air source specifically is an air pump. The connection of the housing of the Compressed air source 15 is in the interior of the filter housing 1 leading connecting lines 16 and 17 given. Within these connecting lines are each the housing of the Compressed air source 15 from the filter housing 1 vibration-decoupling Intermediate elements 18. The connecting line 17 leads from the pressure side of the compressed air source 15 out into a flow space 19 which is connected to that of the larger one Chamber 4 downstream end of the smaller chamber 3 adjacent. In the connecting line 17 is a shutoff valve 20 provided, in particular at the transition from Housing of the compressed air source 15 is arranged to this line can be. The compressed air source is located via the connecting line 16 15 on the suction side with the flow channel 8 in connection.

Die Funktion der beschriebenen Entlüftungsanlage ist wie folgtThe function of the ventilation system described is how follows

Beladung mit Kraftstoffdämpfen aus dem KraftstofftankLoading with fuel vapors from the fuel tank

Aus einem nicht dargestellten Tank ausströmender Kraftstoffdampf gelangt über die Anschlußleitung 9 in die mit Aktivkohle gefüllte größere Kammer 4 des Adsorptions-Filtergehäuses 1. Die Kammer 4 verläßt der dort vorbehandelte Kraftstoffdampf in Richtung der kleineren ebenfalls mit Aktivkohle gefüllten Kammer 3, die er in den Strömungsraum 19 hinein durchströmt. Von dort aus passiert der von Kraftstoff befreite Tankentlüftungsstrom über die Zu- und Abführleitungen 17 und 16 die Druckluftquelle 15, um durch den Strömungsraum 8 hindurch über das Luftfilter 14 durch den Anschlußstutzen 12 in die Atmosphäre zu gelangen. Die Druckluftquelle 15 ist für diese Strömungsführung des Tankentlüftungsstromes durchlässig gestaltet. Fuel vapor flowing out of a tank, not shown passes through the connecting line 9 in the with activated carbon filled larger chamber 4 of the adsorption filter housing 1. The chamber 4 leaves the one pre-treated there Fuel vapor in the direction of the smaller one too Activated carbon filled chamber 3, which he in the flow space 19 flows through. From there the fuel passes freed tank ventilation flow via the supply and discharge lines 17 and 16 the compressed air source 15 to through the Flow space 8 through the air filter 14 through the Connection piece 12 to get into the atmosphere. The compressed air source 15 is for this flow guidance of the tank ventilation flow permeable design.

Regeneration des Adsorptions-Mittels des Adsorptions-FiltersRegeneration of the adsorbent of the adsorption filter

Zur Regeneration des Adsorptions-Filters wird dieses bei laufendem Verbrennungsmotor in umgekehrter Richtung durchströmt, wobei Atmosphärenluft durch den Anschlußstutzen 12 von Motoransaugluft durch den Anschlußstutzen 11 angesaugt wird. Die angesaugte Luft durchströmt auf ihrem Weg durch das Adsorptions-Filter zunächst die kleinere und danach die größere Kammer 3 bzw. 4.For the regeneration of the adsorption filter, this is used flowing internal combustion engine in the opposite direction, whereby atmospheric air through the connecting piece 12th sucked in by engine intake air through the connecting piece 11 becomes. The intake air flows through on its way the adsorption filter first the smaller one and then the one larger chamber 3 or 4.

Dichtheits-SicherheitskontrolleLeakage security check

Für regelmäßig nach an sich bekannten Vorgaben durchzuführende Dichtheits-Sicherheitskontrollen kann die TankEntlüftungsanlage insgesamt durch die Druckluftquelle 15 unter Druck gesetzt werden. Der unter Druck zu setzende Bereich liegt zwischen dem Anschlußstutzen 11 und der Verbindungsleitung 17, die zur Durchführung der Prüfung über nicht dargestellte Ventile verschließbar sind und umfaßt den an den Anschlußstutzen 9 angeschlossenen nicht dargestellten Kraftstofftank. Die Druckluft wird direkt innerhalb des Gehäuses der als Druckluftpumpe ausgeführten Druckluftquelle 15 erzeugt und über die Leitung 17 in das Anlagensystem eingeführt. Die Druckluftquelle 15 saugt die zu verdichtende Luft über die Verbindungsleitung 16 aus dem Luftfiltergehäuse 13 an. Die genaue Art einer Dichtheits-Sicherheitsprüfung der Tankentlüftungsanlage ist an sich bekannt und bedarf daher hier keiner weiteren Erläuterung.For regularly to be carried out according to known specifications The tank ventilation system can carry out leakage safety checks overall by the compressed air source 15 below Pressure. The area to be pressurized lies between the connecting piece 11 and the connecting line 17 who did not conduct the test shown valves are closable and includes the the connecting piece 9 connected not shown Fuel tank. The compressed air is directly inside the housing the compressed air source designed as a compressed air pump 15 generated and introduced via line 17 into the system. The compressed air source 15 sucks the one to be compressed Air via the connecting line 16 from the air filter housing 13 on. The exact type of leak test the tank ventilation system is known per se and therefore needs it no further explanation here.

Aktive Druckluftquelle bei MotorbetriebActive compressed air source during engine operation

Während des Motorbetriebes kann die als Luftpumpe ausgeführte Druckluftquelle 15 laufend Rückspülluft durch das Filter 1 in den Anschlußstutzen 11 der Ansaugluftleitung des Motors fördern.While the engine is running, it can be designed as an air pump Compressed air source 15 continuously backwashing air through the filter 1 in the connecting piece 11 of the intake air line of the engine promote.

In dem Anschlußstutzen 9, der zu dem nicht dargestellten Kraftstofftank führt, kann ein Einwegeventil 21 mit Sperrwirkung in Richtung des Kraftstofftankes angeordnet sein.In the connecting piece 9, to the not shown Fuel tank leads, a one-way valve 21 with locking action be arranged in the direction of the fuel tank.

Der Luftmengenstrom, der während des Motorbetriebes von der Luftpumpe 15 durch das Filter 1 hindurch gefördert wird, wird in Abhängigkeit von relevanten Motorbetriebsdaten, der Abgaszusammensetzung und/oder dem Kraftstoff-Beladungszustand des Adsorptions-Materials des Filters 1 gesteuert bzw. geregelt.The air flow that is generated by the Air pump 15 is conveyed through the filter 1, depending on the relevant engine operating data, the Exhaust gas composition and / or the fuel load state of the adsorption material of the filter 1 controlled or regulated.

Durch die erfindungsgemäße Integration sämtlicher Aggregate einer Tankentlüftungsanlage im das Gehäuse des Adsorptions-Filters dieser Anlage ist ein rationell herstellbares Modulteil gegeben, das lediglich über die Anschlußstutzen 9 und 11 an den Verbrennungsmotor bzw. den Tank angefügt zu werden braucht. Zur Erlangung dieses Vorteiles trägt wesentlich eine autonom arbeitende in das Adsorptions-Filtergehäuse integrierte Druckluftquelle bei. Bezüglich der Anbindung dieser Druckluftquelle an das Adsorptions-Filtergehäuse ist dabei noch wichtig, daß diese über schwingungsentkoppelnde Elemente erfolgt, wobei diese einfach in die Anschlußstutzen integriert werden können.Through the integration of all units according to the invention a tank ventilation system in the housing of the adsorption filter this system is a rationally producible module part given that only through the connecting piece 9 and 11 to be attached to the internal combustion engine or the tank needs. To achieve this advantage is essential autonomously working integrated in the adsorption filter housing Compressed air source at. Regarding the connection of this Compressed air source to the adsorption filter housing is included it is still important that these have vibration-isolating elements takes place, which is simply integrated into the connecting piece can be.

Claims (6)

  1. Adsorption filter for a fuel tank venting system of an internal combustion engine, with connections
    to the atmosphere,
    to the fuel tank,
    to the intake-air line of the internal combustion engine,
       of which those to the atmosphere and to the intake line can be closed in each case by means of a valve,
       and to a compressed-air source, by means of which, with supply and discharge valves being closed, the venting system can be put under pressure for leaktightness tests to be carried out regularly,
    wherein,
    the adsorption medium is stored in two adsorption chambers of different volume of the filter which are separated from one another and are series-connected in terms of flow,
    the larger (4) of the two adsorption chambers (3, 4) is provided with the connections (9, 11) to the fuel tank, on the one hand, and to the intake-air line, on the other hand, the orifice of the connection piece (11) of the intake-air line opening onto that end of the larger chamber (4) which is remote from the smaller chamber (3) in terms of flow,
    the compressed-air source (15) is accommodated in a housing which is attached to the housing (1) of the adsorption filter and which is connected, via a first line (17), to that end of the smaller chamber (3) remote from the larger chamber (4) in terms of flow and, via a second line (16), by way of an air-filter housing (13) provided on the housing (1) of the adsorption filter, to the atmosphere,
    the housing of the compressed-air source (15) is located in the flow path between the atmosphere and that end of the small chamber (3) which is remote from the larger chamber (4) in terms of flow.
  2. Adsorption filter as claimed in claim 1, wherein the flow ducts (16, 8; 17, 19) between the housing of the compressed-air source (15) and the atmosphere, on the one hand, and the small chamber (3), on the other hand, run within the housing (1) of the adsorption filter.
  3. Adsorption filter as claimed in claim 1 or 2, wherein the housing of the compressed-air source 15, is connected to the housing (1) of the adsorption filter via junction lines (16, 17) in a vibration-uncoupled manner.
  4. Device as claimed in one of the preceding claims, wherein a one-way valve (21) having a stop effect in the direction of the fuel tank is arranged in the connecting line between the adsorption filter (1) and the fuel tank.
  5. Method for operating a fuel tank venting system of an internal combustion engine having an adsorption filter as claimed in one of the preceding claims, wherein, while the engine is in operation, the compressed-air source (15) conveys air at least partially and temporarily into the intake-air line of the internal combustion engine.
  6. Method as claimed in claim 5, wherein the air volume flow conveyed through the adsorption filter (1) for regeneration is controlled or regulated as a function of relevant engine operating data, the exhaust-gas composition and/or the loading state of the adsorption material of the filter.
EP97926982A 1996-06-14 1997-06-06 Adsorption filter for the fuel tank venting system of an internal combustion engine and process for operating said system Expired - Lifetime EP0865571B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19623740 1996-06-14
DE1996123740 DE19623740A1 (en) 1996-06-14 1996-06-14 Adsorption filter for fuel tank venting installation of internal combustion engine
DE19628153A DE19628153B4 (en) 1996-06-14 1996-07-12 Method for operating a fuel tank ventilation system of an internal combustion engine
DE19628153 1996-07-12
PCT/DE1997/001137 WO1997047874A1 (en) 1996-06-14 1997-06-06 Adsorption filter for the fuel tank venting system of an internal combustion engine and process for operating said system

Publications (2)

Publication Number Publication Date
EP0865571A1 EP0865571A1 (en) 1998-09-23
EP0865571B1 true EP0865571B1 (en) 1999-12-08

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EP97926982A Expired - Lifetime EP0865571B1 (en) 1996-06-14 1997-06-06 Adsorption filter for the fuel tank venting system of an internal combustion engine and process for operating said system

Country Status (5)

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US (1) US5983870A (en)
EP (1) EP0865571B1 (en)
DE (2) DE19628153B4 (en)
ES (1) ES2141619T3 (en)
WO (1) WO1997047874A1 (en)

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DE19628153A1 (en) 1998-03-05
DE59700822D1 (en) 2000-01-13
ES2141619T3 (en) 2000-03-16
DE19628153B4 (en) 2009-04-16
WO1997047874A1 (en) 1997-12-18
US5983870A (en) 1999-11-16
EP0865571A1 (en) 1998-09-23

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