DE2547065A1 - IC engine fuel tank venting system with valves - has carbon filter and valve preventing excessive fuel enrichment on starting - Google Patents

IC engine fuel tank venting system with valves - has carbon filter and valve preventing excessive fuel enrichment on starting

Info

Publication number
DE2547065A1
DE2547065A1 DE19752547065 DE2547065A DE2547065A1 DE 2547065 A1 DE2547065 A1 DE 2547065A1 DE 19752547065 DE19752547065 DE 19752547065 DE 2547065 A DE2547065 A DE 2547065A DE 2547065 A1 DE2547065 A1 DE 2547065A1
Authority
DE
Germany
Prior art keywords
carbon filter
fuel tank
starting
valve
air line
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.)
Pending
Application number
DE19752547065
Other languages
German (de)
Inventor
Richard Bertsch
Guenter Rosenzopf
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19752547065 priority Critical patent/DE2547065A1/en
Publication of DE2547065A1 publication Critical patent/DE2547065A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold

Abstract

Fuel tank venting regulator of an internal combustion engine is arranged into air channel with active carbon filter of the inlet manifold. This arrangement prevents excessive enrichment of the fuel mixture on starting by drawing stored fuel in the carbon filter. The amount of toxic gases in the exhaust is reduced and long starting times and poor idling are eliminated. A regulating valve (7) is placed between the active carbon filter (6) and inlet manifold (3). This valve opens at rotating speeds above idling speed. The plate of this regulating valve has a restrictor bore (8). A regulating valve (11) can be placed into air channel (9) from cooling blower to active carbon filter (6). This valve opens also at high speeds.

Description

Anlage zurAttachment to

Patent- und Gebrauchsmusterhilfsanmeldung Vorrichtung zur Regelung der Kraftstofftankentlüftung einer Brennkraftmaschine Die Erfindung bezieht sich auf eine Vorrichtung zur Regelung der Kraftstofftankentlüftung einer Brennkraftmaschine über eine Luftleitung mit einen Aktivkohlefilter zum Ansaugrohr.Patent and utility model registration device for regulation the fuel tank vent of an internal combustion engine The invention relates to a device for regulating the fuel tank ventilation of an internal combustion engine Via an air line with an activated carbon filter to the suction pipe.

Die aus dem Kraftstofftank während der Motorabstellphase aus gedampften und im Aktivkohlefilter gespeicherten Kohlenwasserstoffe werden beim Starten der Brennkraftmaschine mit angesaugt und führen zu einer Überfettung des Kraftstoff-LuSt-Gemisches. Eine derartige Überfettung des Kraftstoff-Luft-Gemisches hat zur Folge, daß das Abgas einen hohen Anteil giftiger Bestandteile aufweist und sich neben langen Start zeiten auch ein schlechter Leerlauf nach dem Start ergibt.Those vaporized from the fuel tank during the engine shutdown phase and hydrocarbons stored in the activated carbon filter are released when the Internal combustion engine with sucked in and lead to an over-richness of the fuel-LuSt mixture. Such excessive enrichment of the fuel-air mixture has the consequence that the Exhaust gas has a high proportion of toxic components and is next to long start times also results in a bad idling after the start.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur Regelung der Kraftstofftankentlüftung einer Brennkraftmaschine zu entwickeln, die die obigen Nachteile vermeidet.The invention is based on the object of a device for regulation the fuel tank vent of an internal combustion engine to develop the above Avoids disadvantages.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß in der Luftleitung zwischen Aktivkohlefilter und Ansaugrohr ein Regelventil angeordnet ist, das bei Drehzahlen oberhalb Leerlaufdrehzahl öffnet und dessen Ventilteller eine Drosselbohrung aufweist.This object is achieved according to the invention in that in the air line A control valve is arranged between the activated charcoal filter and the intake pipe Speeds above idle speed opens and its valve disc has a throttle bore having.

Die erfindungsgemäße Anordnung eines Regelventiles in der Luftleitung führt zu einer Begrenzung der Gemischanreicherung während des Startens und im Leerlauf, da während dieser Betriebsphasen lediglich über die Drosselbohrung im Ventilteller Kohlenwasserstoffe aus dem Aktivkohlefilter abgesaugt werden können. Bei ausreichendem Druckgefälle am Ventilteller des Regelventiles, d. h. bei Drehzahlen oberhalb Leerlaufdrehzahl öffnet das Regelventil und ermöglicht eine stärkere Absaugung der Kohlenwasserstoffe aus dem Aktivkohlefilter, so daß durch die erfindungsgemäße Maßnahme die Regenerierung des Aktivkohlefilters nicht beeinträchtigt wird.The inventive arrangement of a control valve in the air line leads to a limitation of the mixture enrichment during starting and idling, because during these operating phases only via the throttle bore in the valve disk Hydrocarbons can be sucked out of the activated carbon filter. With sufficient Pressure drop at the valve disk of the control valve, d. H. at speeds above idle speed opens the control valve and enables a stronger suction of the hydrocarbons from the activated carbon filter, so that regeneration by the measure according to the invention the activated charcoal filter is not impaired.

Eine vorteilhafte Ausgestaltung der Erfindung besteht darin, daß in einer Druckluftleitung vom Kühlgebläse zum Aktivkohlefilter ein Regelventil angeordnet ist, das bei Drehzahlen oberhalb der Laufdrehzahl öffnet und dessen Ventilteller eine Drosselbohrung aufweist.An advantageous embodiment of the invention is that in A control valve is arranged in a compressed air line from the cooling fan to the activated carbon filter is that opens at speeds above the running speed and its valve disc has a throttle bore.

Bei der Anordnung eines Regelventiles in der Druckluft leitung vom Kühlgebläse zum Aktivkohlefilter und eines weiteren Regelventiles in der Luftleitung om Aktivkohlefilter zum Ansaugrohr dient das Regelventil in der Druckluftleitung vorwiegend dazu, einen eventuellen Tanküberdruek während des Startens und im Leerlauf zu vermeiden. Die Größe der Drosselbohrung im Ventilteller ist vom Start- und Leerlaufverhalten der Brennkraftmaschine abhängig. Die Regelventile können im Bedarfsfall auch als elektromagnetisch oder pneumatisch gesteuerte Ventile ausgeführt sein.When arranging a control valve in the compressed air line from Cooling fan to the activated carbon filter and another control valve in the air line The control valve in the compressed air line is used between the activated carbon filter and the suction pipe mainly to a possible tank overpressure during starting and idling to avoid. The size of the throttle bore in the valve disk depends on the starting and idling behavior the internal combustion engine dependent. If necessary, the control valves can also be used as be designed electromagnetically or pneumatically controlled valves.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is simplified in the drawing and is described in more detail below.

Es zeigen: Fig. i ein Blockschaltbild der Vorrichtung zur Regelung der Kraftstofftankentlüftung, Fig. 2 ein Ausführungsbeispiel eines Regelventils.They show: FIG. 1 a block diagram of the device for regulating the fuel tank ventilation, FIG. 2 shows an exemplary embodiment of a control valve.

Bei der in Fig. 1 dargestellten Vorrichtung ist mit 1 der Wraftstofftank bezeichnet, der über eine Luftleitung 2 mit dem Ansaugrohr 3 zur Brennkraftmaschine 4 stromabwärts des Luftfilters 5 in Verbindung steht. In der Luftleitung 2 ist ein Aktivkohlefilter 6 zur Speicherung der während der Motorabstellphase ausgedampften Kohlenwasserstoffe und erfindungsgemäß ein Regelventil 7 angeordnet, das eine Drosselbohrung 8. aufweist. Bei dieser Anordnung des Regelventils 7 stromabwärts des Aktivkohlefilters 6 ist es zweckmäßig, in einer Druckluftleitung 9 vom Kühlgebläse 10 zum Aktivkohlefilter 6 ebenfalls ein Regelventil 11 mit einer Drosselbohrung 12 anzuordnen, um einen eventuellen Tanküberdruck während des Startens und dem Leerlauf zu vermeiden.In the device shown in Fig. 1, 1 is the fuel tank denotes, which via an air line 2 with the intake pipe 3 to the internal combustion engine 4 downstream of the air filter 5 is in communication. In the air line 2 is a Activated carbon filter 6 for storing the evaporated during the engine shutdown phase Hydrocarbons and arranged according to the invention a control valve 7, which has a throttle bore 8. Has. With this arrangement of the control valve 7 downstream of the activated carbon filter 6, it is useful in a compressed air line 9 from the cooling fan 10 to the activated carbon filter 6 also to arrange a control valve 11 with a throttle bore 12 to a Avoid possible tank overpressure during starting and idling.

Die Vorrichtung kann in einem weiteren Ausführungsbeispiel auch so ausgebildet sein, das sie nur das Regelventil 11 in der Druckluftleitung 9 aufweist, ohne das Regelventil 7 in der Luftleitung 2.In a further exemplary embodiment, the device can also do so be designed that it has only the control valve 11 in the compressed air line 9, without the control valve 7 in the air line 2.

In Fig. 2 ist ein mögliches Ausführungsbeispiel des Regelventils 7, 11 dargestellt, mit einem Ventilteller 14, der mit einem festen Ventilsitz 15 zusammen arbeitet und entgegen der Kraft einer Feder 16 in Strömungsrichtung öffnet. Der Nffnungszeitpunkt des Ventiltellers 14 wird vorzugsweise so gewählt, daß er bei einem Druckabfall am Ventilteller 14 erfolgt, der einer Drehzahl unmittelbar über der Leerlaufdrehzahl entspricht.In Fig. 2 is a possible embodiment of the control valve 7, 11 shown, with a valve plate 14, which with a fixed valve seat 15 together works and opens against the force of a spring 16 in the direction of flow. Of the The opening time of the valve disk 14 is preferably selected so that it is at a pressure drop at the valve plate 14 takes place, which is a speed immediately above corresponds to the idle speed.

Während des Startens und des Leerlauf erfolgt die Absaugung der Kohlenwasserstoffe aus dem Aktivkohlefilter 6 lediglich über die Drosselbohrung 8, 12.The hydrocarbons are extracted during starting and idling from the activated carbon filter 6 only via the throttle bore 8, 12.

L e e r s e i t eL e r s e i t e

Claims (2)

A n s p-r ü c h e 1. Vorrichtung zur Regelung der Kraftstofftankentlüftung einer Brennkraftmaschine über eine Luftleitung mit einem Aktivkohlefilter zum Ansaugrohr, dadurch gekennzeichnet, daß in der Luftleitung (2) zwischen Aktivkohlefilter (6) und Ansaugrohr (3) ein Regelventil (7) angeordnet ist, das bei Drehzahlen oberhalb Leerlaufdrehzahl öffnet und dessen Ventilteller (14) eine Drosselbohrung (8) aufweist. A n s p-r ü c h e 1. Device for regulating the fuel tank ventilation an internal combustion engine via an air line with an activated carbon filter to the intake pipe, characterized in that in the air line (2) between the activated carbon filter (6) and intake pipe (3) a control valve (7) is arranged, which at speeds above Idle speed opens and the valve disk (14) has a throttle bore (8). 2. Vorrichtung nach dem Oberbegriff des Anspruchs 1, insbesondere nach Anspruch 1, dadurch gekennzeichnet, daß in einer Druckluftleitung (9) vom Kühlgebläse (10) zum Aktivkohlefilter (6) ein Regelventil (11). angeordnet ist, das bei Drehzahlen oberhalb Leerlaufdrehzahl öffnet und dessen Ventilteller (14) eine Drosselbohrung (12) aufweist.2. Device according to the preamble of claim 1, in particular according to claim 1, characterized in that in a compressed air line (9) from the cooling fan (10) to the activated carbon filter (6) a control valve (11). is arranged that at speeds opens above idle speed and its valve plate (14) has a throttle bore (12).
DE19752547065 1975-10-21 1975-10-21 IC engine fuel tank venting system with valves - has carbon filter and valve preventing excessive fuel enrichment on starting Pending DE2547065A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19752547065 DE2547065A1 (en) 1975-10-21 1975-10-21 IC engine fuel tank venting system with valves - has carbon filter and valve preventing excessive fuel enrichment on starting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752547065 DE2547065A1 (en) 1975-10-21 1975-10-21 IC engine fuel tank venting system with valves - has carbon filter and valve preventing excessive fuel enrichment on starting

Publications (1)

Publication Number Publication Date
DE2547065A1 true DE2547065A1 (en) 1977-09-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE19752547065 Pending DE2547065A1 (en) 1975-10-21 1975-10-21 IC engine fuel tank venting system with valves - has carbon filter and valve preventing excessive fuel enrichment on starting

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DE (1) DE2547065A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070382A1 (en) * 1981-06-25 1983-01-26 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Arrangement for venting vapours from the fuel tank of an automotive vehicle
DE3935612A1 (en) * 1988-11-02 1990-05-03 Volkswagen Ag IC engine fuel vapour recovery accessory - has additional pipe from filter to intake closed at low engine speed
US5275145A (en) * 1992-12-07 1994-01-04 Walbro Corporation Vapor recovery system for motor vehicles
EP0588729A1 (en) * 1992-09-18 1994-03-23 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Device for fuel vapour recovery
WO1997047874A1 (en) 1996-06-14 1997-12-18 Knecht Filterwerke Gmbh Adsorption filter for the fuel tank venting system of an internal combustion engine and process for operating said system
WO1999006688A1 (en) * 1997-07-28 1999-02-11 Siemens Canada Limited Evaporative emission system for low engine intake system vacuums
US5881700A (en) * 1996-09-24 1999-03-16 Robert Bosch Gmbh Tank venting device for motor vehicles
DE3935209C2 (en) * 1989-10-23 2001-04-12 Walter Holzer Adsorption filter for fuel vapors

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0070382A1 (en) * 1981-06-25 1983-01-26 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Arrangement for venting vapours from the fuel tank of an automotive vehicle
DE3935612C2 (en) * 1988-11-02 2000-06-15 Volkswagen Ag Device assigned to an internal combustion engine for recovering fuel vapors stored in a fuel vapor filter
DE3935612A1 (en) * 1988-11-02 1990-05-03 Volkswagen Ag IC engine fuel vapour recovery accessory - has additional pipe from filter to intake closed at low engine speed
DE3935209C2 (en) * 1989-10-23 2001-04-12 Walter Holzer Adsorption filter for fuel vapors
EP0588729A1 (en) * 1992-09-18 1994-03-23 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Device for fuel vapour recovery
FR2695879A1 (en) * 1992-09-18 1994-03-25 Renault Fuel vapor recovery device.
US5275145A (en) * 1992-12-07 1994-01-04 Walbro Corporation Vapor recovery system for motor vehicles
FR2698915A1 (en) * 1992-12-07 1994-06-10 Walbro Corp Vapor recovery assembly for fuel system.
WO1997047874A1 (en) 1996-06-14 1997-12-18 Knecht Filterwerke Gmbh Adsorption filter for the fuel tank venting system of an internal combustion engine and process for operating said system
US5983870A (en) * 1996-06-14 1999-11-16 Knecht Filterwerke Gmbh Adsorption filter for the fuel tank venting system of an internal combustion engine and process for operating said system
DE19628153B4 (en) * 1996-06-14 2009-04-16 Mahle Filtersysteme Gmbh Method for operating a fuel tank ventilation system of an internal combustion engine
US5881700A (en) * 1996-09-24 1999-03-16 Robert Bosch Gmbh Tank venting device for motor vehicles
US6196202B1 (en) 1997-07-28 2001-03-06 Siemens Canada Limited Evaporative emission system for low engine intake system vacuums
WO1999006688A1 (en) * 1997-07-28 1999-02-11 Siemens Canada Limited Evaporative emission system for low engine intake system vacuums

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