EP1415080B1 - Ventilation system for a fuel tank of an internal combustion engine - Google Patents

Ventilation system for a fuel tank of an internal combustion engine Download PDF

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Publication number
EP1415080B1
EP1415080B1 EP02791634A EP02791634A EP1415080B1 EP 1415080 B1 EP1415080 B1 EP 1415080B1 EP 02791634 A EP02791634 A EP 02791634A EP 02791634 A EP02791634 A EP 02791634A EP 1415080 B1 EP1415080 B1 EP 1415080B1
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EP
European Patent Office
Prior art keywords
air
intake
filter
internal combustion
combustion engine
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.)
Expired - Fee Related
Application number
EP02791634A
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German (de)
French (fr)
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EP1415080A1 (en
Inventor
Frank Reiners
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.)
Mahle Filtersysteme GmbH
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Mahle Filtersysteme GmbH
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Publication of EP1415080A1 publication Critical patent/EP1415080A1/en
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Anticipated expiration legal-status Critical
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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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)

Description

Die Erfindung betrifft eine Be- und Entlüftungseinrichtung des Kraftstoff-Tankes eines Verbrennungsmotors nach dem Oberbegriff des Patentanspruchs 1:The invention relates to a ventilation device of the fuel tank of an internal combustion engine according to the preamble of patent claim 1:

Eine solche Einrichtung ist aus US-A-5,878,729 bekannt.Such a device is out US-A-5,878,729 known.

Weiterhin ist eine solche Einrichtung, bei der die Pumpe in dem die Rückspülluft von dem Adsorptionsfilter zu dem Luftansaugbereich des Verbrennungsmotors führenden Abschnitt angeordnet ist, in DE 198 29 423 A1 beschrieben. Bei dieser Einrichtung muss der Pumpe ein Luftansaugfilter luftansaugseitig vorgeschaltet sein, dessen einzige Funktion die Filtration der Ansaugluft der Pumpe ist.Furthermore, such a device in which the pump is arranged in the back-flushing air from the adsorption filter to the air intake region of the internal combustion engine leading portion, in DE 198 29 423 A1 described. In this device, the pump must be preceded by an air intake filter air intake side, the only function is the filtration of the intake air of the pump.

Die bei der gattungsgemäßen Einrichtung vorhandene Druckmesseinrichtung dient dazu, den luftführenden Bereich von dem Tankinneren aus bis zu den Absperrventilen, wenn diese geschlossen sind, auf eine Leckage in diesem Bereich zu überprüfen. Diese Druckmesseinrichtung ist bei Vorhandensein einer Pumpe insbesondere in diese, durch die bei der vorgenannten Einrichtung in dem bezüglich einer Leckage zu überprüfenden Bereich ein Überdruck aufgebaut werden kann, integriert. Bei der Druckmessung wird unter anderem eine feine Drosselbohrung durchströmt. Diese feine Drosselbohrung muss gegen schmutzbedingtes Verstopfen geschützt werden, wozu ansaugseitig der Pumpe ein Filter mit einem relativ hohen Abscheidegrad erforderlich ist. Auch die Pumpe selbst muss in hohem Grade vor Verschmutzung geschützt werden. Ein hoher Abscheidegrad bedeutet wiederum einen hohen Druckverlust bzw. wegen dieses hohen Druckverlustes, wenn dieser nicht zu groß werden soll, eine große Filterfläche.The existing in the generic device pressure measuring device is used to check the air-conducting area from the tank interior to the shut-off valves, when they are closed, for leakage in this area. This pressure measuring device is in the presence of a pump in particular in this, by the in the aforementioned Device in the area to be checked for a leakage overpressure can be built integrated. In the pressure measurement, inter alia, a fine throttle bore is flowed through. This fine throttle bore must be protected against dirt-related clogging, for which a filter with a relatively high degree of separation is required on the intake side of the pump. The pump itself must be highly protected against contamination. A high degree of separation in turn means a high pressure loss or because of this high pressure loss, if this is not to be too large, a large filter surface.

Die Erfindung beschäftigt sich mit dem Problem, bei einer gattungsgemäßen Einrichtung mit möglichst wenigen bzw. keinen, einen besonders hohen Druckverlust aufweisenden Filtern zur Zufuhr von Atmosphärenluft in den Bereich, der zwischen Tankinnerem und geschlossenen Absperrventilen liegt, auskommen zu können.The invention is concerned with the problem of being able to get along in a generic device with as few or no, a particularly high pressure loss having filters for supplying atmospheric air in the area between the tank interior and closed shut-off valves.

Gelöst wird das vorstehende Problem bei einer gattungsgemäßen Einrichtung durch eine Ausbildung nach insbesondere dem kennzeichnenden Merkmal g des Patentanspruchs 1.The above problem is solved in a generic device by a training according in particular to the characterizing feature g of claim 1.

Zweckmäßige und vorteilhafte Ausgestaltungen dieser Erfindung sind Gegenstand der Unteransprüche und werden anhand eines Ausführungsbeispieles noch näher erläutert werden.Advantageous and advantageous embodiments of this invention are the subject of the dependent claims and will be explained in more detail with reference to an embodiment.

Die Zeichnung zeigt in der einzigen

Fig. 1
eine Be- und Entlüftungseinrichtung des Kraftstoff-Tankes eines Verbrennungsmotors in schematischer Darstellung.
The drawing shows in the only one
Fig. 1
a ventilation device of the fuel tank of an internal combustion engine in a schematic representation.

Ein Tank 1 ist über ein Ansaugluftfilter 2 eines Verbrennungsmotors 3 mit der Atmosphäre über ein Adsorptionsfilter 4 verbindbar. Zwischen dem Tank 1 und dem Adsorptionsfilter 4, das ein Aktivkohlefilter sein kann, sind an sich bei Tankbe- und Entlüftungseinrichtungen bekannte Ventile wie beispielsweise ein mit Bezug auf den Tank 1 wirkendes, nicht gezeichnetes Druckhalteventil, vorgesehen.A tank 1 is connectable via an intake air filter 2 of an internal combustion engine 3 with the atmosphere via an adsorption filter 4. Between the tank 1 and the adsorption filter 4, which may be an activated carbon filter, are known per se at Tankbe- and venting valves such as acting with respect to the tank 1, not shown pressure-holding valve, is provided.

Das Adsorptionsfilter 4 ist durch Anschluss über eine Leitung 5 an den Luftansaugbereich des Motors 3, das heißt einen Bereich zwischen dem Ansaugluftfilter 2 und dem Motor 3 zur Regeneration rückspülbar. Bei einer derartigen Rückspülung, die in vorbestimmten Zeitabschnitten bzw. bei Feststellung einer bestimmten Beladungsgrenze des Adsorptionsfilters erfolgt, wird durch die in den Verbrennungsmotor 3 angesaugte Luft Frischluft aus der Atmosphäre durch das Luftfilter 2 hindurchgeführt. In der Luftansaugleitung 6 des Verbrennungsmotors 3 befindet sich eine motorübliche Ansaug-Drosselklappe 7. Die durch eine Strömungsleitung 8 über das Luftansaugfilter 2 aus der Atmosphäre bei einem Rückspülen des Adsorptionsfilters 4 einzuführende Frischluft wird mit Bezug auf den Verbrennungsmotor 3 stromauf der Drosselklappe 7 angesaugt. Mit Bezug auf den Verbrennungsmotor 3 wird bei Rückspülung des Adsorptionsfilters 4 ferner die Frischluft in einem Bereich stromab der Drosselklappe 7 in die Luftansaugleitung 6 eingesaugt.The adsorption filter 4 is backwashed by connection via a line 5 to the air intake region of the engine 3, that is, a region between the intake air filter 2 and the engine 3 for regeneration. In such a backwashing, which takes place at predetermined time intervals or upon detection of a certain loading limit of the adsorption filter, fresh air from the atmosphere is passed through the air filter 2 through the air sucked into the internal combustion engine 3. In the air intake 6 of the Internal combustion engine 3 is a motor-usual intake throttle 7. The fresh air to be introduced through a flow line 8 via the air intake filter 2 from the atmosphere in a backwashing of the adsorption filter 4 is sucked with respect to the engine 3 upstream of the throttle valve 7. With reference to the internal combustion engine 3, in the case of backwashing of the adsorption filter 4, the fresh air is further drawn into the air intake line 6 in an area downstream of the throttle valve 7.

Gegenüber der Atmosphäre und gegenüber der Ansaugleitung 6 des Verbrennungsmotors 3 ist das Adsorptionsfilter 4 einschließlich eines in den Tank 1 hineinreichenden Bereiches durch ein erstes in der Leitung 8 untergebrachtes und ein zweites sich in der Leitung 5 befindliches Absperrventil 9 bzw. 10 luftdicht absperrbar. Eine solche Absperrung ermöglicht es, den zwischen dem Tank 1 und den Absperrventilen 9 und 10 liegenden, luftführenden Bereich auf Dichtheit überprüfen zu können.Compared with the atmosphere and with respect to the suction line 6 of the internal combustion engine 3, the adsorption filter 4 including a reaching into the tank 1 area by a first housed in the line 8 and a second located in the line 5 check valve 9 and 10 airtight shut off. Such a barrier makes it possible to check the lying between the tank 1 and the shut-off valves 9 and 10, air-conducting area for leaks.

Eine Möglichkeit einer solchen Dichtheitsprüfung besteht darin, den betreffenden Bereich bei verschlossenen Absperrventilen 9, 10 durch eine Pumpe 11 auf einen Überdruck gegenüber Atmosphäre zu versetzen. Dieser sich auf Überdruck befindliche Raum kann sodann durch eine mit dem zu überprüfenden Raum verbundene Druckmesseinrichtung, die in der Zeichnung nicht dargestellt ist und in die Pumpe 11 integriert sein kann, auf Undichtheit überprüft werden. Die Pumpe 11 saugt die zur Erzielung des Überdruckes erforderliche, in den zu überprüfenden Raum einzuführende Luft aus der Luftansaugleitung 6 an einer Stelle stromab der Drosselklappe 7 an.One way of such a leak test is to put the area concerned with closed shut-off valves 9, 10 by a pump 11 to an overpressure to atmosphere. This overpressure space can then be checked for leakage by a pressure measuring device connected to the space to be checked, which is not shown in the drawing and can be integrated into the pump 11. The pump 11 sucks the pressure required to achieve the overpressure to be introduced into the space to be checked air from the air intake 6 at a point downstream of the throttle valve 7 at.

Mit Bezug auf den Verbrennungsmotor 3 ist dem Luftansaugfilter 2 stromab ein Ansaugluftadsorptionsfilter 12 nachgeschaltet. Dieses Ansaugluftadsorptionsfilter 12 kann beispielsweise ein aktivkohlegetränktes Vlies sein.With respect to the engine 3, the intake air filter 2 is followed downstream by an intake air adsorption filter 12. This Ansaugluftadsorptionsfilter 12 may be, for example, a Aktivkohlegetränktes fleece.

Das Ansaugluftadsorptionsfilter 12 dient einerseits dazu, bei abgeschaltetem Verbrennungsmotor 3 aus dem Luftansaugfilter 2 in die Atmosphäre austretende rückströmende Ansaugluft von etwaigen umweltschädlichen Schadstoffen zu befreien und andererseits bei einer durch die Leitung 8 erfolgenden Tankentlüftung zu einer über das Adsorptionsfilter 4 hinausgehenden Behandlung der in die Atmosphäre aus dem Tank 1 austretenden Behandlung durch ein nachgeschaltetes zusätzliches Aktivkohlefilter. Dadurch kann das Aktivkohlefilter 4 volumenmäßig entweder geringer ausgelegt werden oder bei gleichbleibender Auslegung wird eine erhöhte Sicherheit gegenüber einem Austreten von Schadstoffen zusammen mit der dem Tank 1 entweichenden Luft in die Atmosphäre erreicht.The Ansaugluftadsorptionsfilter 12 serves on the one hand, when the internal combustion engine 3 from the air intake filter 2 exiting into the atmosphere exiting recirculated intake air of any polluting pollutants and on the other hand at a successful through the line 8 tank venting to a beyond the adsorption filter 4 treatment in the atmosphere the tank 1 exiting treatment through a downstream additional activated carbon filter. As a result, the activated carbon filter 4 can be designed to be either smaller in volume or, with a consistent design, increased safety against leakage of pollutants together with the air escaping the tank 1 into the atmosphere is achieved.

Durch die Erfindung wird ein erheblicher Vorteil auch bereits dann erreicht, wenn das erste Absperrventil 9 atmosphärenseitig nicht mit der Ansaugluftleitung 6 verbunden ist. In diesem Fall reicht atmosphärenseitig des ersten Absperrventiles 9 ein einfaches Ventilschutzfilter aus, wenn die Pumpe 11 Ansaugluft über das Luftansaugfilter 2 ansaugen kann und die Druckmesseinrichtung für die Dichtigkeitsprüfung im Bereich der Pumpe 11 liegt, das heißt in einem Bereich, in dem sie gegen von der Atmosphäre eindringenden Schmutz durch das Luftansaugfilter 2 sicher geschützt ist.The invention also achieves a considerable advantage even when the first shut-off valve 9 is not connected to the intake air line 6 on the atmosphere side. In this case, a simple valve protection filter is sufficient on the atmosphere side of the first shut-off valve 9 when the pump 11 draws in intake air via the air intake filter 2 can and the pressure measuring device for the leak test in the region of the pump 11 is located, that is, in a region in which it is safely protected against penetrating from the atmosphere dirt through the air intake filter 2.

Eine Dichtigkeitsprüfung des luftführenden Bereiches zwischen dem Tank 1 und den Absperrventilen 9 und 10 kann auch ohne die Verwendung einer Pumpe 11 in einer an sich bekannten Weise durch das Erzeugen eines Unterdruckes in diesem Bereich durch die in den Verbrennungsmotor 3 einströmende Verbrennungsluft durchgeführt werden. In diesem Falle wird das zweite Absperrventil 10 nach Erreichen eines in dem zu überprüfenden Raum gegenüber Atmosphäre erniedrigten Druckes ebenfalls geschlossen und sodann mit einer ebenfalls bereits für einen solchen Anwendungszweck bekannten Druckmesseinrichtung ein möglicher Druckanstieg als Hinweis für eine Undichtigkeit detektiert. Bei Fehlen einer Pumpe 11 besteht der durch die Erfindung zu erzielende Vorteil in einer Verbindung des ersten Absperrventiles 9 mit der Atmosphäre über ein mit einem Ansaugluftadsorptionsfilter 12 kombiniertes Luftansaugfilter 2.A leak test of the air-conducting area between the tank 1 and the shut-off valves 9 and 10 can also be carried out without the use of a pump 11 in a manner known per se by generating a negative pressure in this area by the combustion air flowing into the internal combustion engine 3. In this case, the second shut-off valve 10 is also closed after reaching a reduced pressure in the room to be tested against the atmosphere and then detected with a pressure measuring device also known for such an application, a possible pressure increase as an indication of a leak. In the absence of a pump 11, the advantage to be achieved by the invention is in a connection of the first shut-off valve 9 with the atmosphere via an air intake filter 2 combined with an intake air adsorption filter 12.

Claims (6)

  1. A ventilation and aeration system for the fuel tank (1) of an internal combustion engine (3), in which
    a) the ventilation and aeration are accomplished via an adsorption filter (4),
    b) the adsorption filter is regenerable by backwashing with atmospheric air,
    c) the backwashing air is supplied to the air intake area of the internal combustion engine (3),
    d) the connections leading from the adsorption filter (4) on the one hand to the atmosphere and to the intake area of the internal combustion engine (3) on the other hand can be interrupted by a first and second cutoff valve (9, 10),
    e) the interior of the tank (1) and the air-carrying area between the tank (1) and the cutoff valves (9, 10) is connected to a pressure-measuring device for determining the pressure inside the entire area containing air when the cutoff valves (9, 10) are closed,
    f) a pump (11) may be provided in the area carrying the backwashing air between the adsorption filter (4) and the intake area of the internal combustion engine (3), so that with the help of this pump, fresh air from the atmosphere can be introduced into the area between the tank (1) and the cutoff valves (9, 10),
    characterized by at least one of the following features:
    g) the first cutoff valve (9) leading to the atmosphere is in a line (8) which leads from the adsorption filter (4) through the air intake filter (2) of the internal combustion engine (3) to the atmosphere, and through which a connection to the atmosphere is possible only through the air intake filter (2),
    h) if a pump (11) is present, it is connected to the atmosphere via the air intake filter (2) of the internal combustion engine (3) with intake of fresh air to be introduced in the area between the tank (1) on the one hand and the valves (9, 10) on the other hand.
  2. The system according to Claim 1,
    characterized in that
    an intake air adsorption filter (12) is connected downstream from the engine air intake filter (2) with respect to the engine intake air flowing through this filter.
  3. The system according to Claim 2,
    characterized in that
    the intake air adsorption filter (12) is integrated into the intake air filter (2).
  4. The system according to Claim 2 or 3,
    characterized in that
    the intake air adsorption filter (12) is an activated carbon filter.
  5. The system according to one of Claims 3 through 4,
    characterized in that
    the intake air adsorption filter (12) is designed in the form of a nonwoven material.
  6. The system according to one of Claims 2 through 5,
    characterized in that
    the intake air adsorption filter (12) is detachably connected to the air intake filter (2).
EP02791634A 2001-12-22 2002-12-17 Ventilation system for a fuel tank of an internal combustion engine Expired - Fee Related EP1415080B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10163923 2001-12-22
DE10163923A DE10163923A1 (en) 2001-12-22 2001-12-22 Ventilation device of the fuel tank of an internal combustion engine
PCT/DE2002/004607 WO2003056164A1 (en) 2001-12-22 2002-12-17 Ventilation system for a fuel tank of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP1415080A1 EP1415080A1 (en) 2004-05-06
EP1415080B1 true EP1415080B1 (en) 2008-02-27

Family

ID=7710841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02791634A Expired - Fee Related EP1415080B1 (en) 2001-12-22 2002-12-17 Ventilation system for a fuel tank of an internal combustion engine

Country Status (4)

Country Link
US (1) US7163004B2 (en)
EP (1) EP1415080B1 (en)
DE (2) DE10163923A1 (en)
WO (1) WO2003056164A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090084362A1 (en) * 2007-09-28 2009-04-02 Wing Chan Catalyst material for evaporative emission control system
DE102012013854A1 (en) 2012-07-12 2012-12-20 Daimler Ag Adsorption filter, particularly for fuel supply device of internal combustion engine, comprises receiving container, which has base and lateral wall, by which receiving volume of receiving container is limited

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JP3139318B2 (en) 1995-02-27 2001-02-26 トヨタ自動車株式会社 Failure diagnosis device for evaporation purge system
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Also Published As

Publication number Publication date
WO2003056164A1 (en) 2003-07-10
US7163004B2 (en) 2007-01-16
DE10163923A1 (en) 2003-07-03
US20050126549A1 (en) 2005-06-16
DE50211791D1 (en) 2008-04-10
EP1415080A1 (en) 2004-05-06

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