EP0340745A1 - Device for feeding a fuel additive into the fuel tank of motor vehicle - Google Patents

Device for feeding a fuel additive into the fuel tank of motor vehicle Download PDF

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Publication number
EP0340745A1
EP0340745A1 EP89107991A EP89107991A EP0340745A1 EP 0340745 A1 EP0340745 A1 EP 0340745A1 EP 89107991 A EP89107991 A EP 89107991A EP 89107991 A EP89107991 A EP 89107991A EP 0340745 A1 EP0340745 A1 EP 0340745A1
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EP
European Patent Office
Prior art keywords
fuel tank
fuel
control valve
pump
chamber
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Granted
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EP89107991A
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German (de)
French (fr)
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EP0340745B1 (en
Inventor
Fritz Dr. Naumann
Hans-Günther Haldenwanger
Herwig Reim
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Audi AG
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Audi AG
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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

Definitions

  • the invention relates to a device for supplying a fuel additive into the fuel tank of a motor vehicle, the additive being admixed to the fuel from a reservoir via a pump device.
  • the object of the invention is to provide a device of the generic type that is simple, inexpensive and reliable in terms of production technology, with which a sufficiently precise admixture of the fuel additive can be carried out.
  • a pressure source present in the motor vehicle in particular a vacuum source, can be used as the medium which drives the positive displacement pump.
  • a control valve and the positive displacement pump with the corresponding connecting lines and two check valves are required.
  • the control valve is actuated directly by the closure of the fuel tank in such a way that the fuel additive is automatically added each time the fuel tank is opened.
  • the schematic drawing shows a device with a vacuum operated diaphragm pump and a two-way control valve.
  • the device shown shows a reservoir (10) for the fuel additive to be supplied to the fuel (e.g. G 15).
  • the storage container (10) can be provided, in a manner not shown, with a display device which optically or acoustically indicates whether additives have to be refilled in the storage container (10).
  • the reservoir (10) is connected via a line (12) to a diaphragm pump (14) as a pump device.
  • the diaphragm pump (14) is composed of a housing (16), an elastic diaphragm as a movable pump element (18) and a spring (20) that biases the diaphragm in one direction.
  • the membrane (18) divides the housing (16) into two chambers (22, 24).
  • the line (12) into which a check valve (26) is switched opens into the chamber (22).
  • the check valve (26) is continuous in the direction of the chamber (22), but is blocked in the opposite direction to the storage container.
  • a further line (28) opens into the chamber (22), into which a second, controllable check valve (30) is switched on.
  • the check valve (30) forms, with a housing section (32) and a membrane (34) carrying the movable valve member, a closed chamber (36), into which the spring (38) prestressing the membrane is also inserted.
  • the line (28) serves to supply the additive either directly into the fuel tank, into the filler pipe of the fuel tank or into a fuel return line of the internal combustion engine.
  • the chamber (24) of the diaphragm pump (14) and the chamber (38) of the controllable check valve (30) are each via a line (40, 42) connected to a two-way control valve (44). Furthermore, the control valve (44) is connected to a vacuum source of the motor vehicle via a line (46) into which a vacuum reservoir (48) is connected.
  • the vacuum source can either be an existing vacuum pump in the motor vehicle (e.g. for a brake booster) or, in the case of a throttle valve-controlled internal combustion engine, the intake manifold downstream of the throttle valve.
  • the control valve (44) has a control spool (50) protruding from its housing (52), which is biased by an internal spring (54) into a switching state in which it controls the chamber (24) of the diaphragm pump via line (40) (14) vented (ventilation valve 53) and the line (42) acts on the chamber (38) of the controllable valve (30) with negative pressure. This negative pressure causes the check valve (34) to be open.
  • This switching state is assumed by the control valve (44) when the closure (here screw cap 56) of the fuel tank inlet connection (58) is removed (for refueling the motor vehicle).
  • control slide (50) When the fuel tank is closed or the screw cap (56) is screwed on, the control slide (50) is moved into the second switching state by the annular collar (56 a), the line (42) and the chamber (38) of the check valve (30) now being vented (Ventilation slot 51) and the chamber (24) of the diaphragm pump (14) via line (40) is subjected to negative pressure.
  • the function of the device described is as follows: When the fuel tank is closed or the screw cap (56) is on, the chamber (24) of the diaphragm pump (14) is pressurized via the control valve (44), causing the diaphragm (18) against the force of the spring (20) on the drawing upwards is moved. As a result of the volume increase taking place in the chamber (22), the check valve (26) is pulled open and fuel additive is conveyed from the reservoir (10) into the chamber (22). If the vacuum supply is interrupted or suspended for any reason in this position, the force of the spring is sufficient (20) not to open the check valve (30) against the force of the spring (38) and to inadvertently supply additives to the fuel tank.
  • the control valve (44) assumes the other switching state, in which the line (40) is now vented and the line (42) is subjected to a vacuum.
  • the check valve (30) opens and the diaphragm (18) in the drawing is moved downward by the force of the spring (20) and the additive in the chamber (22) is supplied to the fuel tank or the fuel in a defined amount added.
  • the amount of additive supplied from the chamber (22) when the motor vehicle is being refueled can be defined so that it is just sufficient when the fuel tank is fully refueled (maximum tank capacity) in order to achieve the intended effect in the internal combustion engine. This avoids that with the usual refueling (statistically approx. 2/3 of the maximum tank content) there is no overdosing. If necessary, it would be possible to provide a locking lever or a locking valve on the control slide of the control valve (44) (or at another suitable location), via which an admixture of additive can be prevented if the tank cap is to be opened without intentional refueling.
  • the fuel filler cap can expediently be provided with an information sign which draws attention to the connection between the opening of the fuel filler cap and the associated admixture of the additive.
  • control valve (44) - or the control valve (44) and the vacuum reservoir (48) as a structural unit - can be arranged directly on the fuel tank or on the fuel filler pipe (58). If necessary, even the entire device shown in the drawing can form a single structural unit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

For feeding a fuel additive into the fuel tank of a motor vehicle the pump device is formed by a pneumatically actuated displacement pump (14) the movable pump element (18) of which can be adjustably pressure controlled by way of a control valve (44) against the force of a preloaded spring (20), the control valve (44) being preferably actuated directly by the fuel tank cap (56). …<IMAGE>…

Description

Die Erfindung betrifft eine Vorrichtung zum Zuführen eines Kraftstoff-­Zusatzmittels in den Kraftstoffbehälter eines Kraftfahrzeuges, wobei das Zusatzmittel aus einem Vorratsbehälter über eine Pumpeinrichtung dem Kraftstoff zugemischt wird.The invention relates to a device for supplying a fuel additive into the fuel tank of a motor vehicle, the additive being admixed to the fuel from a reservoir via a pump device.

In Ländern mit schlechten Kraftstoffquallitäten kann es angezeigt sein, den Kraftstoff ein Zusatzmittel bzw. Additiv beizumengen, um Funktions­störungen an der Brennkraftmaschine durch unerwünschte Ablagerungen auszuschließen.In countries with poor fuel quality, it may be appropriate to add an additive to the fuel in order to rule out malfunctions in the internal combustion engine due to undesired deposits.

Aufgabe der Erfindung ist es, eine herstellungstechnisch einfache, kos­tengünstige und funktionssichere Vorrichtung der gattungsgemäßen Art zu schaffen, mit der eine ausreichend genaue Beimengung des Kraftstoff-Zu­satzmittels durchführbar ist.The object of the invention is to provide a device of the generic type that is simple, inexpensive and reliable in terms of production technology, with which a sufficiently precise admixture of the fuel additive can be carried out.

Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte und zweckmäßige Weiterbil­dungen der Erfindung sind den Patentansprüchen 2 bis 7 entnehmbar.This object is achieved with the characterizing features of claim 1. Advantageous and expedient developments of the invention can be found in claims 2 to 7.

Durch die erfindungsgemäßen Maßnahmen kann eine im Kraftfahrzeug vor­handene Druckquelle, insbesondere eine Unterdruckquelle, als Medium verwendet werden, welches die Verdrängerpumpe antreibt. Als wesentliche Teile sind somit lediglich ein Steuerventil und die Verdrängerpumpe mit den entsprechenden Verbindungsleitungen und zwei Rückschlagventilen er­forderlich. Das Steuerventil wird in besonders vorteilhafter Weise un­mittelbar von dem Verschluß des Kraftstoffbehälters betätigt, derart, daß mit Jedem Öffnen des Kraftstoffbehälters automatisch eine Bei­mengung des Kraftstoff-Zusatzmittels erfolgt.By means of the measures according to the invention, a pressure source present in the motor vehicle, in particular a vacuum source, can be used as the medium which drives the positive displacement pump. As essential parts only a control valve and the positive displacement pump with the corresponding connecting lines and two check valves are required. In a particularly advantageous manner, the control valve is actuated directly by the closure of the fuel tank in such a way that the fuel additive is automatically added each time the fuel tank is opened.

Ein Ausführungsbeispiel der Erfindung ist im folgenden mit weiteren Einzelheiten näher erläutert. Die schematische Zeichnung zeigt eine Vorrichtung mit einer unterdruckbetätigten Membranpumpe und einem Zwei­wege-Steuerventil.An embodiment of the invention is explained in more detail below with further details. The schematic drawing shows a device with a vacuum operated diaphragm pump and a two-way control valve.

Die dargestellte Vorrichtung zeigt einen Vorratsbehälter (10) für das dem Kraftstoff zuzuführende Kraftstoff-Zusatzmittel (z. B. G 15). Der Vorratsbehälter (10) kann in nicht dargestellter Weise mit einer Anzei­geeinrichtung versehen sein, welche optisch oder akustisch anzeigt, ob Zusatzmittel in den Vorratsbehälter (10) nachzufüllen ist.The device shown shows a reservoir (10) for the fuel additive to be supplied to the fuel (e.g. G 15). The storage container (10) can be provided, in a manner not shown, with a display device which optically or acoustically indicates whether additives have to be refilled in the storage container (10).

Der Vorratsbehälter (10) ist über eine Leitung (12) mit einer Membran­pumpe (14) als Pumpeinrichtung verbunden. Die Membranpumpe (14) setzt sich aus einem Gehäuse (16), einer elastische Membrane als bewegliches Pumpenelement (18) und einer die Membrane in einer Richtung vorspannen­den Feder (20) zusammen. Die Membrane (18) unterteilt das Gehäuse (16) in zwei Kammern (22,24).The reservoir (10) is connected via a line (12) to a diaphragm pump (14) as a pump device. The diaphragm pump (14) is composed of a housing (16), an elastic diaphragm as a movable pump element (18) and a spring (20) that biases the diaphragm in one direction. The membrane (18) divides the housing (16) into two chambers (22, 24).

In die Kammer (22) mündet die Leitung (12), in die ein Rückschlagventil (26) eingeschaltet ist. Das Rückschlagventil (26) ist in Richtung zur Kammer (22) durchgängig, in Gegenrichtung zum Vorratsbehälter jedoch gesperrt. Ferner mündet in die Kammer (22) eine weitere Leitung (28), in die ein zweites, ansteuerbares Rückschlagventil (30) eingeschaltet ist.The line (12) into which a check valve (26) is switched opens into the chamber (22). The check valve (26) is continuous in the direction of the chamber (22), but is blocked in the opposite direction to the storage container. A further line (28) opens into the chamber (22), into which a second, controllable check valve (30) is switched on.

Das Rückschlagventil (30) bildet mit einem Gehäuseabschnitt (32) und einer das bewegliche Ventilglied tragenden Membrane (34) eine abge­schlossene Kammer (36), in die auch die die Membrane vorspannende Feder (38) eingesetzt ist.The check valve (30) forms, with a housing section (32) and a membrane (34) carrying the movable valve member, a closed chamber (36), into which the spring (38) prestressing the membrane is also inserted.

Die Leitung (28) dient zum Zuführen des Zusatzmittels entweder unmit­telbar in den Kraftstoffbehälter, in das Einfüllrohr des Kraftstoffbe­hälters oder in eine Kraftstoff-Rücklaufleitung der Brennkraftmaschine.The line (28) serves to supply the additive either directly into the fuel tank, into the filler pipe of the fuel tank or into a fuel return line of the internal combustion engine.

Die Kammer (24) der Membranpumpe (14) sowie die Kammer (38) des an­steuerbaren Rückschlagventiles (30) sind über je eine Leitung (40,42) mit einem Zweiwege-Steuerventil (44) verbunden. Ferner ist das Steuer­ventil (44) über eine Leitung (46), in die ein Unterdruck-Vorratsbehäl­ter (48) eingeschaltet ist, mit einer Unterdruckquelle des Kraftfahr­zeuges verbunden. Die Unterdruckquelle kann entweder eine im Kraftfahr­zeug vorhandene Unterdruck-Pumpe (z. B. für einen Bremskraftverstärker) oder bei einer Drosselklappen gesteuerten Brennkraf tmaschine das Saug­rohr stromab der Drosselklappe sein.The chamber (24) of the diaphragm pump (14) and the chamber (38) of the controllable check valve (30) are each via a line (40, 42) connected to a two-way control valve (44). Furthermore, the control valve (44) is connected to a vacuum source of the motor vehicle via a line (46) into which a vacuum reservoir (48) is connected. The vacuum source can either be an existing vacuum pump in the motor vehicle (e.g. for a brake booster) or, in the case of a throttle valve-controlled internal combustion engine, the intake manifold downstream of the throttle valve.

Das Steuerventil (44) besitzt einen aus dessen Gehäuse (52) herausra­genden Steuerschieber (50), der durch eine innen liegende Feder (54) in einen Schaltzustand vorgespannt ist, in dem er über die Leitung (40) die Kammer (24) der Membranpumpe (14) belüftet (Belüftungsventil 53) und über die Leitung (42) die Kammer (38) des aufsteuerbaren Ventiles (30) mit Unterdruck beaufschlagt. Diese Unterdruckbeaufschlagung be­wirkt, daß das Rückschlagventil (34) geöffnet ist. Diesen Schaltzustand nimmt das Steuerventil (44) ein, wenn der Verschluß (hier Schraubver­schlußkappe 56) des Kraftstoffbehälter-Einlaufstutzens (58) abgenommen ist (zum Betanken des Kraftfahrzeuges).The control valve (44) has a control spool (50) protruding from its housing (52), which is biased by an internal spring (54) into a switching state in which it controls the chamber (24) of the diaphragm pump via line (40) (14) vented (ventilation valve 53) and the line (42) acts on the chamber (38) of the controllable valve (30) with negative pressure. This negative pressure causes the check valve (34) to be open. This switching state is assumed by the control valve (44) when the closure (here screw cap 56) of the fuel tank inlet connection (58) is removed (for refueling the motor vehicle).

Bei geschlossenem Kraftstoffbehälter bzw. aufgeschraubter Schraubver­schlußkappe (56) wird der Steuerschieber (50) durch den ringförmigen Kragen (56 a) in den zweiten Schaltzustand bewegt, wobei nunmehr die Leitung (42) und die Kammer (38) des Rückschlagventiles (30) belüftet sind (Belüftungsschlitz 51) und die Kammer (24) der Membranpumpe (14) über die Leitung (40) mit Unterdruck beaufschlagt wird.When the fuel tank is closed or the screw cap (56) is screwed on, the control slide (50) is moved into the second switching state by the annular collar (56 a), the line (42) and the chamber (38) of the check valve (30) now being vented (Ventilation slot 51) and the chamber (24) of the diaphragm pump (14) via line (40) is subjected to negative pressure.

Die Funktion der beschriebenen Vorrichtung ist wie folgt:
Bei geschlossenem Kraftstoffbehälter bzw. aufgesetzter Schraubver­schlußkappe (56) ist über das Steuerventil (44) die Kammer (24) der Membranpumpe (14) mit Unterdruck beaufschlagt, wodurch die Membrane (18) entgegen der Kraft der Feder (20) auf der Zeichnung nach oben bewegt wird. Durch die dabei stattfindende Volumenvergrößerung in der Kammer (22) wird das Rückschlagventil (26) aufgezogen und Kraftstoff-­Zusatzmittel aus dem Vorratsbehälter (10) in die Kammer (22) gefördert. Sollte in dieser Stellung aus irgend einem Grunde die Unterdruckversor­gung unterbrochen sein oder aussetzen, so reicht die Kraft der Feder (20) nicht aus, um entgegen der Kraft der Feder (38) das Rückschlagven­til (30) zu öffnen und ungewollt Zusatzmittel dem Kraftstoffbehälter zuzuführen.The function of the device described is as follows:
When the fuel tank is closed or the screw cap (56) is on, the chamber (24) of the diaphragm pump (14) is pressurized via the control valve (44), causing the diaphragm (18) against the force of the spring (20) on the drawing upwards is moved. As a result of the volume increase taking place in the chamber (22), the check valve (26) is pulled open and fuel additive is conveyed from the reservoir (10) into the chamber (22). If the vacuum supply is interrupted or suspended for any reason in this position, the force of the spring is sufficient (20) not to open the check valve (30) against the force of the spring (38) and to inadvertently supply additives to the fuel tank.

Wird nunmehr die Schraubverschlußkappe (56) zum Befüllen des Kraft­stoffbehälters geöffnet, so nimmt das Steuerventil (44) den anderen Schaltzustand ein, bei dem nunmehr die Leitung (40) belüftet und die Leitung (42) mit Unterdruck beaufschlagt wird. Dadurch öffnet das Rück­schlagventil (30) und es wird durch die Kraft der Feder (20) die Mem­brane (18) auf der Zeichnung nach unten bewegt und das in der Kammer (22) befindliche Zusatzmittel in einer definierten Menge dem Kraft­stoffbehälter zugeführt bzw. dem Kraftstoff zugemischt.If the screw cap (56) is now opened to fill the fuel tank, the control valve (44) assumes the other switching state, in which the line (40) is now vented and the line (42) is subjected to a vacuum. As a result, the check valve (30) opens and the diaphragm (18) in the drawing is moved downward by the force of the spring (20) and the additive in the chamber (22) is supplied to the fuel tank or the fuel in a defined amount added.

Die jeweils aus der Kammer (22) beim Betanken des Kraftfahrzeuges zuge­führte Menge an Zusatzmittel kann so definiert sein, daß sie beim voll­ständigen Betanken des Kraftstoffbehälters (maximaler Tankinhalt) gera­de noch ausreicht, um die beabsichtigte Wirkung in der Brennkraftma­schine zu erfüllen. Dadurch wird vermieden, daß bei der üblichen Betan­kung (statistisch ca. jeweils 2/3 des maximalen Tankinhaltes) keine Überdosierung erfolgt. Gegebenenfalls wäre es möglich, an dem Steuer­schieber des Steuerventiles (44) (oder an einer anderen geeigneten Stelle) ein Sperrhebelchen oder ein Sperrventil vorzusehen, über wel­ches eine Zumischung von Zusatzmittel unterbindbar ist, wenn der Tank­verschluß ohne beabsichtigtes Auftanken geöffnet werden soll. Der Tank­verschluß kann zweckmäßig mit einem Hinweisschild versehen sein, wel­ches auf den Zusammenhang zwischen dem Öffnen des Tankverschlusses und dem damit verbundenen Zumischen des Zusatzmittels aufmerksam macht.The amount of additive supplied from the chamber (22) when the motor vehicle is being refueled can be defined so that it is just sufficient when the fuel tank is fully refueled (maximum tank capacity) in order to achieve the intended effect in the internal combustion engine. This avoids that with the usual refueling (statistically approx. 2/3 of the maximum tank content) there is no overdosing. If necessary, it would be possible to provide a locking lever or a locking valve on the control slide of the control valve (44) (or at another suitable location), via which an admixture of additive can be prevented if the tank cap is to be opened without intentional refueling. The fuel filler cap can expediently be provided with an information sign which draws attention to the connection between the opening of the fuel filler cap and the associated admixture of the additive.

In nicht dargestellter Weise kann das Steuerventil (44) - oder das Steuerventil (44) und der Unterdruck-Vorratsbehälter (48) als Bauein­heit - unmittelbar am Kraftstoffbehälter oder am Kraftstoffeinfüllrohr (58) angeordnet sein. Gegebenenfalls kann sogar die gesamte, in der Zeichung dargestellte Vorrichtung eine einzige Baueinheit bilden.In a manner not shown, the control valve (44) - or the control valve (44) and the vacuum reservoir (48) as a structural unit - can be arranged directly on the fuel tank or on the fuel filler pipe (58). If necessary, even the entire device shown in the drawing can form a single structural unit.

Claims (7)

1. Vorrichtung zum Zuführen eines Kraftstoff-Zusatzmittels in den Kraftstoffbehälter eines Kraftfahrzeuges, wobei das Zusatzmittel aus einem Vorratsbehälter über eine Pumpeinrichtung dem Kraftstoff zugemischt wird, dadurch gekennzeichnet, daß die Pumpeinrichtung eine pneumatisch betätigte Verdrängerpumpe (14) ist, deren beweg­liches Pumpenelement (18) über ein Steuerventil (44) entgegen der Kraft einer vorgespannten Feder (20) druckgesteuert verstellbar ist und dabei das Volumen einer mit dem Vorratsbehälter (10) und dem Kraftstoffbehälter verbundenen Kammer (22) zur Förderung einer de­finierten Menge verdrängt, wobei zwischen Vorratsbehälter (10) und Kammer (22) sowie zwischen Kammer (22) und Kraftstoffbehälter je ein in Richtung zum Kraftstoffbehälter durchgängiges Rückschlagven­til (26,30) vorgesehen ist.1. Device for supplying a fuel additive into the fuel tank of a motor vehicle, the additive being admixed to the fuel from a reservoir via a pump device, characterized in that the pump device is a pneumatically operated displacement pump (14), the movable pump element (18) of which Via a control valve (44) against the force of a prestressed spring (20), it can be adjusted in a pressure-controlled manner and thereby displaces the volume of a chamber (22) connected to the storage container (10) and the fuel container in order to convey a defined quantity, whereby between the storage container (10) and chamber (22) and between the chamber (22) and the fuel tank a check valve (26, 30) which is continuous in the direction of the fuel tank is provided. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Ver­drängerpumpe eine Membranpumpe (14) ist.2. Device according to claim 1, characterized in that the displacement pump is a diaphragm pump (14). 3. Vorrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Verdrängerpumpe unterdruckbetätigt ist und daß zwischen dem Steuerventil (44) und der Unterdruckquelle ein Unterdruck-Vorrats­behälter (48) angeordnet ist.3. Device according to claims 1 and 2, characterized in that the displacement pump is vacuum-actuated and that a vacuum reservoir (48) is arranged between the control valve (44) and the vacuum source. 4. Vorrichtung nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß das Steuerventil (44) ein Zweiwege-Ventil ist, welches im einen Schaltzustand die Verdrängerpumpe (14) und im anderen Schaltzustand das als ansteuerbares Ventil ausgebildete Rückschlagventil (30) zwischen Verdrängerpumpe und Kraftstoffbehälter mit der Unterdruck­quelle verbindet.4. Device according to claims 1 to 3, characterized in that the control valve (44) is a two-way valve which, in one switching state, the displacement pump (14) and in the other switching state, the check valve (30) formed as a controllable valve between the displacement pump and Connect the fuel tank to the vacuum source. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Steuerventil (44) die jeweils nicht mit Unterdruck beaufschlagte Kammer (24,38) der Verdrängerpumpe (14) bzw. des Rückschlagventiles (30) mit der Atmosphäre verbindet.5. The device according to claim 4, characterized in that the control valve (44) connects the non-pressurized chamber (24,38) of the displacement pump (14) or the check valve (30) with the atmosphere. 6. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Steuerventil (44) von dem Verschluß (56) des Kraftstoffbehälters gesteuert ist.6. The device according to one or more of claims 1 to 5, characterized in that the control valve (44) is controlled by the closure (56) of the fuel tank. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß das Steuerventil (44) benachbart dem Einfüllstutzen (58) des Kraft­stoffbehälters angeordnet ist und unmittelbar durch den Kraftsoff­behälterverschluß (56) betätigt ist.7. The device according to claim 6, characterized in that the control valve (44) is arranged adjacent to the filler neck (58) of the fuel tank and is actuated directly by the fuel tank closure (56).
EP89107991A 1988-05-06 1989-05-03 Device for feeding a fuel additive into the fuel tank of motor vehicle Expired - Lifetime EP0340745B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3815523 1988-05-06
DE3815523A DE3815523C1 (en) 1988-05-06 1988-05-06

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EP0340745A1 true EP0340745A1 (en) 1989-11-08
EP0340745B1 EP0340745B1 (en) 1990-11-07

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EP89107991A Expired - Lifetime EP0340745B1 (en) 1988-05-06 1989-05-03 Device for feeding a fuel additive into the fuel tank of motor vehicle

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US (1) US4936261A (en)
EP (1) EP0340745B1 (en)
JP (1) JPH01315656A (en)
DE (2) DE3815523C1 (en)
ES (1) ES2019482B3 (en)

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Also Published As

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EP0340745B1 (en) 1990-11-07
US4936261A (en) 1990-06-26
DE58900023D1 (en) 1990-12-13
JPH01315656A (en) 1989-12-20
ES2019482B3 (en) 1991-06-16
DE3815523C1 (en) 1989-01-19

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