EP2578529B1 - Method and device for transferring fuel from the fuel tank of a motor vehicle - Google Patents

Method and device for transferring fuel from the fuel tank of a motor vehicle Download PDF

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Publication number
EP2578529B1
EP2578529B1 EP12185622.3A EP12185622A EP2578529B1 EP 2578529 B1 EP2578529 B1 EP 2578529B1 EP 12185622 A EP12185622 A EP 12185622A EP 2578529 B1 EP2578529 B1 EP 2578529B1
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EP
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Prior art keywords
fuel
motor vehicle
control device
fuel tank
diagnostic test
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EP12185622.3A
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German (de)
French (fr)
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EP2578529A1 (en
Inventor
Klaus Treiber
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines

Definitions

  • the invention relates to a method and a device for conveying fuel from the fuel tank of a motor vehicle.
  • Such pumping may e.g. by introducing a suction device into the fuel filler neck or in a service opening, which is present for example in the vehicle interior
  • the invention provides a method and apparatus for extracting fuel from the fuel tank of a motor vehicle, which in a simple manner enables complete draining of the fuel tank without requiring an additional service opening.
  • An inventive method for conveying fuel from the fuel tank of a motor vehicle includes the steps to connect a diagnostic tester with a control unit of the motor vehicle and control the control unit of the motor vehicle by the diagnostic test device such that the control unit drives the fuel pump of the motor vehicle, so that this fuel from the Fuel tank promotes.
  • a diagnostic test device for motor vehicles, which have a fuel tank and a control unit, is designed for electrical connection to the control unit and is able to control the control unit such that it drives the fuel pump of the motor vehicle in such a way that the fuel pump receives fuel from the fuel tank of the motor vehicle promotes.
  • An inventive method and a device enable the user or vehicle mechanic to easily and conveniently remove fuel from the fuel tank of a motor vehicle and to completely empty the fuel tank of the motor vehicle when needed.
  • so-called saddle tanks which can be emptied only with difficulty using the previously known methods, can be completely emptied.
  • the emptying of the fuel tank is also not prevented or made difficult by a possibly to prevent fuel theft in the fuel filler neck built Absaugêt.
  • On the access to a usually difficult to access service opening which requires, for example, the expansion of the rear seat, parts of the interior trim and / or the carpet can be dispensed with.
  • the fuel tank can also without lift, z. As in the breakdown service on the road, and emptied on the costly and time-consuming expansion of a filled fuel tank to empty it outside the vehicle, can be dispensed with.
  • An object of the invention is to prevent overheating of the fuel pump. This object is solved by the features of claims 1 and 9.
  • the emptying of the fuel tank runs off automatically after the start, so that the fuel tank emptying can also be performed by less intensively trained workshop personnel and workshop personnel can perform other activities during the fuel tank emptying.
  • the method prior to driving the controller, includes connecting an output of the fuel pump, eg, with a hose, to an external container to convey the fuel removed from the fuel tank to the external container.
  • the from the fuel tank withdrawn fuel can be collected in the external container and optionally reused or disposed of properly. Pollution of the environment by the fuel removed from the fuel tank is reliably avoided.
  • the controller is driven so that it drives the fuel pump for at least a defined period of time. Characterized in that the fuel pump is driven only over a defined and limited period of time, dry running, overheating and the resulting possible damage or destruction of the fuel pump is reliably prevented.
  • the defined period is preferably 30 seconds when the fuel pump is driven periodically and 120 seconds when the fuel pump is continuously driven. Driving for such limited periods reliably prevents damage to the fuel pump by dry running and / or overheating.
  • the fuel pump is periodically driven for a number of predetermined periods of preferably 30 seconds each to allow for complete draining of the fuel tank while avoiding dry running and / or overheating of the fuel pump.
  • the amount of fuel delivered from the fuel tank during a defined period of time is determined, for example, by measuring the flow rate through the drain of the fuel pump or the weight gain of the external reservoir into which the fuel drawn from the fuel tank is directed. Determining the amount of fuel delivered in a defined period of time and taken out of the fuel tank makes it possible to check the correct functioning of the fuel pump.
  • An inventive diagnostic test device and the method according to the invention can be used in addition to the emptying of the fuel tank and for checking the function of the fuel pump.
  • the device reads a fuel tank fill signal from the controller of the motor vehicle and controls the controller in response to the read fuel fill signal.
  • the evaluation of the fuel filling signal takes place, for example, in the diagnostic test device, so that no additional intelligence in the control unit is required and the method with conventional control devices, as they are currently installed in motor vehicles, can be performed.
  • the fuel tank fill signal is available, for example, on the CAN bus of the motor vehicle in a manufacturer-specific protocol or in a standardized OBD software.
  • the fuel pump is preferably repeatedly cycled until the fuel tank fill signal indicates that fuel is no longer in the fuel tank.
  • a device according to the invention (diagnostic test device) 4 is, as in the Fig. 1 shown electrically connected via a first single or multi-pole data line 10 to the control unit 8 in the interior of a motor vehicle 2.
  • the diagnostic test device 4 may additionally be connected via further connecting lines 9 to other components of the motor vehicle 2.
  • the diagnostic test device 4 is connected, for example, to the power supply to the battery 3 of the motor vehicle 2.
  • the diagnostic test device 4 is connected to an input and output device 6, which is designed to enable the input of data into the diagnostic test device 4 and to display the results of the diagnostic test.
  • the input and output device 6 may be formed, for example, as a portable computer (laptop). However, other embodiments of such input and output device 6 are possible as long as they allow the input and output of data in and out of the diagnostic test device 4.
  • Fig. 2 shows a schematic representation of the operation of the invention.
  • Fuel is stored in a fuel tank 16 shown schematically and may be removed from the fuel tank 16 via a fuel extraction line 18.
  • a fuel extraction line 18 In the fuel extraction line 18, a preferably electrically driven fuel pump 14 is provided, which takes the fuel through the fuel extraction line 18 from the fuel tank 16 during operation and outputs under elevated pressure in a fuel pressure line 20.
  • the fuel pump 14 is actuated via a control line 12 from the control unit 8 of the motor vehicle 2.
  • the fuel pressure line is one in which Fig. 2 not shown, injection device of the engine of the motor vehicle 2 connected to supply the latter during operation the necessary fuel.
  • the fuel pressure line 20 e.g. by a hose connected to an external reservoir 22 adapted to receive fuel taken from the fuel tank 16.
  • a flow meter 24 is provided, which makes it possible to measure the amount of fuel flowing through the fuel pressure line 20.
  • a measuring device may be provided, which measures, for example, based on the level of the fuel in the external container 22 or the weight gain of the external container 22, which taken from the fuel tank 16 and introduced into the external container 22 amount of fuel.
  • control unit 8 as already in the Fig. 1 shown connected via a first data line 10 with a diagnostic test device 4 according to the invention.
  • the control unit 8 controls the diagnostic test device 4 by appropriate signals on the data line 10, the control unit 8 such that the control unit 8 via the further control line 12, the fuel pump 14 drives such that this fuel through the fuel extraction line 18 from the Removing fuel tank 16 and outputs through the fuel pressure line 20 into the external container 22.
  • the fuel pump 14 is operated without the engine of the motor vehicle 2 is in operation.
  • the amount of fuel flowing through the fuel pressure line 20 is optionally measured by the flow meter 24 and the measurement result is reported back to the diagnostic test device 4.
  • the diagnostic test device 4 can in particular be designed so that it controls the control unit 8 such that it drives the fuel pump 14 periodically at intervals of approximately 30 seconds.
  • the diagnostic test device 4 the control unit 8 to control so that it drives the fuel pump once over a longer period of, for example 120s.
  • a level sensor 26 is provided which outputs a level signal to the control unit 8.
  • the fuel level signal is evaluated by the controller 8, or preferably by the diagnostic tester 4, and the operation of the fuel pump 14 is stopped when the fuel level signal indicates that the fuel tank 16 is completely depleted. Dry running and overheating of the fuel pump 14 is reliably prevented.
  • the operation of the fuel pump 14 is stopped when the flow meter 24 detects that fuel is no longer flowing through the fuel pressure line 20, so that the fuel pump 14 runs dry and there is a risk that the fuel pump 14 is overheated and damaged.
  • connection between the diagnostic test device 4 and the control unit 8 is preferably via the standard interface, which is also used for diagnostic purposes for connecting the diagnostic test device 4 to the control unit 8. At the control unit 8 so no changes must be made.
  • the method according to the invention can also be carried out with a diagnostic test device 4 according to the invention in conjunction with control devices 8 already installed in motor vehicles 2, without the motor vehicles 2 or the control devices 8 installed therein having to be retrofitted or replaced.
  • the user is preferably referred to before the start of the tank emptying function by the diagnostic test device 4 via the input and output device 6 on the safety regulations to be complied with regard to component protection, accident prevention and environmental protection.
  • the depletion of the fuel tank 16 is not started until the user confirms that he has read the displayed safety instructions.
  • An inventive method and a device according to the invention allow both the measurement of the delivery rate of the fuel pump 14 for diagnostic purposes as well as a partial or complete emptying of the fuel tank 16, without the need for mechanical intervention in the motor vehicle 2 are required. This will also allow small workshops to expand their range of diagnostics products and to offer the functions of tank emptying and fuel pump diagnostics.
  • the invention provides a comfortable and safe tank emptying function and at the same time a fuel flow rate measurement both for workshops and for mobile (breakdown) auxiliary forces available.
  • Used car, leasing and car rental companies and car recyclers can easily and conveniently pump off excess or incorrectly fueled fuel, eliminating the need for time-consuming and expensive garage visits.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Fördern von Kraftstoff aus dem Kraftstofftank eines Kraftfahrzeugs.The invention relates to a method and a device for conveying fuel from the fuel tank of a motor vehicle.

Stand der TechnikState of the art

Manchmal ist es notwendig, Kraftstoff aus dem Kraftstofftank eines Kraftfahrzeugs abzupumpen, beispielsweise um überschüssigen oder irrtümlich fehlerhaft getankten Kraftstoff, z.B. Benzin anstelle von Diesel oder umgekehrt, aus dem Kraftstofftank zu entfernen.Sometimes it is necessary to pump fuel out of the fuel tank of a motor vehicle, for example, excess or erroneously fueled fuel, e.g. Remove gasoline instead of diesel or vice versa, from the fuel tank.

Ein derartiges Abpumpen kann z.B. durch Einbringen einer Saugvorrichtung in den Kraftstoffeinfüllstutzen oder in eine Serviceöffnung erfolgen, die beispielsweise im Fahrzeuginnenraum vorhanden istSuch pumping may e.g. by introducing a suction device into the fuel filler neck or in a service opening, which is present for example in the vehicle interior

Das Abpumpen mit Hilfe der im Fahrzeug verbauten Kraftstoffpumpe ist aus der US 2011/0197855 A1 bekannt.The pumping with the help of the built-in vehicle fuel pump is out of the US 2011/0197855 A1 known.

Offenbarung der ErfindungDisclosure of the invention

Mit der Erfindung werden ein Verfahren und eine Vorrichtung zum Entnehmen von Kraftstoff aus dem Kraftstofftank eines Kraftfahrzeugs bereitgestellt, die auf einfache Weise eine vollständige Entleerung des Kraftstofftanks ermöglichen, ohne dass es dazu erforderlich ist, eine zusätzliche Serviceöffnung vorzusehen.The invention provides a method and apparatus for extracting fuel from the fuel tank of a motor vehicle, which in a simple manner enables complete draining of the fuel tank without requiring an additional service opening.

Ein erfindungsgemäßes Verfahren zum Fördern von Kraftstoff aus dem Kraftstofftank eines Kraftfahrzeugs beinhaltet die Schritte, ein Diagnosetestgerät mit einem Steuergerät des Kraftfahrzeugs zu verbinden und das Steuergerät des Kraftfahrzeugs durch das Diagnosetestgerät derart anzusteuern, dass das Steuergerät die Kraftstoffpumpe des Kraftfahrzeugs antreibt, damit diese Kraftstoff aus dem Kraftstofftank fördert.An inventive method for conveying fuel from the fuel tank of a motor vehicle includes the steps to connect a diagnostic tester with a control unit of the motor vehicle and control the control unit of the motor vehicle by the diagnostic test device such that the control unit drives the fuel pump of the motor vehicle, so that this fuel from the Fuel tank promotes.

Ein erfindungsgemäßes Diagnosetestgerät für Kraftfahrzeuge, die einen Kraftstofftank und ein Steuergerät aufweisen, ist zur elektrischen Verbindung mit dem Steuergerät ausgebildet und in der Lage, das Steuergerät derart anzusteuern, dass es die Kraftstoffpumpe des Kraftfahrzeugs derart antreibt, dass die Kraftstoffpumpe Kraftstoff aus dem Kraftstofftank des Kraftfahrzeugs fördert.A diagnostic test device according to the invention for motor vehicles, which have a fuel tank and a control unit, is designed for electrical connection to the control unit and is able to control the control unit such that it drives the fuel pump of the motor vehicle in such a way that the fuel pump receives fuel from the fuel tank of the motor vehicle promotes.

Ein erfindungsgemäßes Verfahren und eine erfindungsgemäße Vorrichtung ermöglichen es dem Anwender bzw. Kfz-Mechaniker, einfach und bequem Kraftstoff aus dem Kraftstofftank eines Kraftfahrzeugs zu entnehmen und den Kraftstofftank des Kraftfahrzeugs bei Bedarf vollständig zu entleeren. Insbesondere können auch so genannte Satteltanks, die mit den bisher bekannten Verfahren nur schwer entleert werden können, vollständig entleert werden. Die Entleerung des Kraftstofftanks wird auch nicht durch eine ggf. zur Verhinderung von Kraftstoffdiebstahl in den Kraftstoffeinfüllstutzen eingebaute Absaugsicherung verhindert oder erschwert. Auf den Zugriff auf eine in der Regel nur schwer zugängliche Serviceöffnung, der beispielsweise den Ausbau der Rücksitzbank, von Teilen der Innenverkleidung und/oder des Teppichs erfordert, kann verzichtet werden.An inventive method and a device according to the invention enable the user or vehicle mechanic to easily and conveniently remove fuel from the fuel tank of a motor vehicle and to completely empty the fuel tank of the motor vehicle when needed. In particular, so-called saddle tanks, which can be emptied only with difficulty using the previously known methods, can be completely emptied. The emptying of the fuel tank is also not prevented or made difficult by a possibly to prevent fuel theft in the fuel filler neck built Absaugsicherung. On the access to a usually difficult to access service opening, which requires, for example, the expansion of the rear seat, parts of the interior trim and / or the carpet can be dispensed with.

Auch kann auf externe Entnahmemittel wie batteriebetriebene Pumpvorrichtungen verzichtet werden. Insbesondere kann die Entleerung auch dann durchgeführt werden, wenn solche externen Entnahmemittel nicht zur Verfügung stehen.Also can be dispensed with external extraction means such as battery-powered pumping devices. In particular, the emptying can also be carried out if such external extraction means are not available.

Der Kraftstofftank kann auch ohne Hebebühne, z. B. im Panneneinsatz auf der Straße, entleert werden und auf den kosten- und zeitaufwendigen Ausbau eines gefüllten Kraftstofftanks, um diesen außerhalb des Fahrzeugs zu entleeren, kann verzichtet werden.The fuel tank can also without lift, z. As in the breakdown service on the road, and emptied on the costly and time-consuming expansion of a filled fuel tank to empty it outside the vehicle, can be dispensed with.

Eine Aufgabe der Erfindung ist es ein Überhitzen der Kraftstoffpumpe zu verhindern. Diese Aufgabe wird durch die Merkmale der Ansprüche 1 und 9 gelöst.An object of the invention is to prevent overheating of the fuel pump. This object is solved by the features of claims 1 and 9.

Die Entleerung des Kraftstofftank läuft nach dem Start selbstständig ab, so dass die Kraftstofftankentleerung auch von wenig intensiv ausgebildetem Werkstattpersonal durchgeführt werden kann und das Werkstattpersonal während der Kraftstofftankentleerung andere Tätigkeiten durchführen kann.The emptying of the fuel tank runs off automatically after the start, so that the fuel tank emptying can also be performed by less intensively trained workshop personnel and workshop personnel can perform other activities during the fuel tank emptying.

In einer Ausführungsform schließt das Verfahren ein, vor dem Ansteuern des Steuergeräts einen Ausgang der Kraftstoffpumpe z.B. mit einem Schlauch mit einem externen Behälter zu verbinden, um den aus dem Kraftstofftank entnommenen Kraftstoff in den externen Behälter zu befördern. Der aus dem Kraftstofftank entnommene Kraftstoff kann so in dem externen Behälter gesammelt und gegebenenfalls wieder verwendet oder fachgerecht entsorgt werden. Eine Verschmutzung der Umgebung durch den aus dem Kraftstofftank entnommenen Kraftstoff wird zuverlässig vermieden.In one embodiment, prior to driving the controller, the method includes connecting an output of the fuel pump, eg, with a hose, to an external container to convey the fuel removed from the fuel tank to the external container. The from the fuel tank withdrawn fuel can be collected in the external container and optionally reused or disposed of properly. Pollution of the environment by the fuel removed from the fuel tank is reliably avoided.

In einer Ausführungsform wird das Steuergerät so angesteuert, dass es die Kraftstoffpumpe über wenigstens einen definierten Zeitraum antreibt. Dadurch, dass die Kraftstoffpumpe nur über einen definierten und begrenzten Zeitraum angesteuert wird, wird ein Trockenlaufen, ein Überhitzen und eine daraus resultierende mögliche Beschädigung oder Zerstörung der Kraftstoffpumpe zuverlässig verhindert.In one embodiment, the controller is driven so that it drives the fuel pump for at least a defined period of time. Characterized in that the fuel pump is driven only over a defined and limited period of time, dry running, overheating and the resulting possible damage or destruction of the fuel pump is reliably prevented.

Der definierte Zeitraum beträgt vorzugsweise 30 Sekunden, wenn die Kraftstoffpumpe periodisch angesteuert wird, und 120 Sekunden, wenn die Kraftstoffpumpe kontinuierlich angesteuert wird. Ein Ansteuern über derart begrenzte Zeiträume verhindert zuverlässig eine Beschädigung der Kraftstoffpumpe durch Trockenlaufen und/oder Überhitzen.The defined period is preferably 30 seconds when the fuel pump is driven periodically and 120 seconds when the fuel pump is continuously driven. Driving for such limited periods reliably prevents damage to the fuel pump by dry running and / or overheating.

In einer Ausführungsform wird die Kraftstoffpumpe periodisch über eine Anzahl definierter Zeiträume von vorzugsweise jeweils 30 Sekunden angetrieben, um ein vollständiges Entleeren des Kraftstofftank zu ermöglichen und gleichzeitig ein Trockenlaufen und/oder Überhitzen der Kraftstoffpumpe zu vermeiden.In one embodiment, the fuel pump is periodically driven for a number of predetermined periods of preferably 30 seconds each to allow for complete draining of the fuel tank while avoiding dry running and / or overheating of the fuel pump.

In einer Ausführungsform wird die während eines definierten Zeitraum aus dem Kraftstofftank geförderte Kraftstoffmenge bestimmt, beispielsweise indem der Durchfluss durch den Ablauf der Kraftstoffpumpe oder die Gewichtszunahme des externen Behälters, in den der aus dem Kraftstofftank entnommene Kraftstoff geleitet wird, gemessen wird. Das Bestimmen der in einem definierten Zeitraum geförderten und aus dem Kraftstofftank entnommenen Kraftstoffmenge ermöglicht es, die korrekte Funktion der Kraftstoffpumpe zu überprüfen. Ein erfindungsgemäßes Diagnosetestgerät und das erfindungsgemäße Verfahren können so neben der Entleerung des Kraftstofftanks auch zum Überprüfen der Funktion der Kraftstoffpumpe verwendet werden.In one embodiment, the amount of fuel delivered from the fuel tank during a defined period of time is determined, for example, by measuring the flow rate through the drain of the fuel pump or the weight gain of the external reservoir into which the fuel drawn from the fuel tank is directed. Determining the amount of fuel delivered in a defined period of time and taken out of the fuel tank makes it possible to check the correct functioning of the fuel pump. An inventive diagnostic test device and the method according to the invention can be used in addition to the emptying of the fuel tank and for checking the function of the fuel pump.

In einer Ausführungsform liest die Vorrichtung ein Kraftstofftankfüllsignal aus dem Steuergerät des Kraftfahrzeugs aus und steuert das Steuergerät in Abhängigkeit von dem ausgelesenen Kraftstofffüllsignal an. Durch Auswerten des Kraftstofffüllsignals wird ein vollständiges Entleeren des Kraftstofftanks ermöglicht, ohne dass es dabei zu einem schädlichen Trockenlaufen und/oder Überhitzen der Kraftstoffpumpe kommt.In one embodiment, the device reads a fuel tank fill signal from the controller of the motor vehicle and controls the controller in response to the read fuel fill signal. By evaluating the Fuel fill signal allows complete draining of the fuel tank without detrimental dry running and / or overheating of the fuel pump.

Das Auswerten des Kraftstofffüllsignals findet dabei beispielsweise im Diagnosetestgerät statt, so dass keine zusätzliche Intelligenz im Steuergerät erforderlich ist und das Verfahren mit herkömmlichen Steuergeräten, wie sie derzeit bereits in Kraftfahrzeugen installiert sind, durchgeführt werden kann.The evaluation of the fuel filling signal takes place, for example, in the diagnostic test device, so that no additional intelligence in the control unit is required and the method with conventional control devices, as they are currently installed in motor vehicles, can be performed.

Das Kraftstofftankfüllsignal ist beispielsweise auf dem CAN-Bus des Kraftfahrzeugs in einem herstellerspezifischen Protokoll oder in einer genormten OBD-Software verfügbar. Die Kraftstoffpumpe wird vorzugsweise wiederholt periodisch angesteuert, bis das Kraftstofftankfüllsignal anzeigt, dass sich kein Kraftstoff mehr im Kraftstofftank befindet.The fuel tank fill signal is available, for example, on the CAN bus of the motor vehicle in a manufacturer-specific protocol or in a standardized OBD software. The fuel pump is preferably repeatedly cycled until the fuel tank fill signal indicates that fuel is no longer in the fuel tank.

Die Erfindung wird im Folgenden anhand der beigefügten Figuren näher erläutert. Dabei zeigt:

  • Fig. 1 eine schematische Darstellung einer erfindungsgemäßen Vorrichtung in Verbindung mit einem Kraftfahrzeug; und
  • Fig. 2 eine schematische Darstellung der Funktionsweise einer erfindungsgemäßen Vorrichtung.
The invention will be explained in more detail below with reference to the attached figures. Showing:
  • Fig. 1 a schematic representation of a device according to the invention in conjunction with a motor vehicle; and
  • Fig. 2 a schematic representation of the operation of a device according to the invention.

Eine erfindungsgemäße Vorrichtung (Diagnosetestgerät) 4 ist, wie in der Fig. 1 gezeigt, elektrisch über eine erste ein- oder mehrpolige Datenleitung 10 mit dem Steuergerät 8 im Inneren eines Kraftfahrzeugs 2 verbunden.A device according to the invention (diagnostic test device) 4 is, as in the Fig. 1 shown electrically connected via a first single or multi-pole data line 10 to the control unit 8 in the interior of a motor vehicle 2.

Das Diagnosetestgerät 4 kann zusätzlich über weitere Verbindungsleitungen 9 mit weiteren Komponenten des Kraftfahrzeugs 2 verbunden sein. Insbesondere ist das Diagnosetestgerät 4 beispielsweise zur Stromversorgung mit der Batterie 3 des Kraftfahrzeugs 2 verbunden.The diagnostic test device 4 may additionally be connected via further connecting lines 9 to other components of the motor vehicle 2. In particular, the diagnostic test device 4 is connected, for example, to the power supply to the battery 3 of the motor vehicle 2.

Über eine weitere Datenleitung 5 ist das Diagnosetestgerät 4 mit einer Ein- und Ausgabevorrichtung 6 verbunden, die ausgebildet ist, um die Eingabe von Daten in das Diagnosetestgerät 4 zu ermöglichen und die Ergebnisse des Diagnosetests anzuzeigen.Via another data line 5, the diagnostic test device 4 is connected to an input and output device 6, which is designed to enable the input of data into the diagnostic test device 4 and to display the results of the diagnostic test.

Die Ein- und Ausgabevorrichtung 6 kann beispielsweise als tragbarer Computer (Laptop) ausgebildet sein. Es sind aber auch andere Ausführungsformen einer derartigen Ein- und Ausgabevorrichtung 6 möglich, solange sie die Ein- und Ausgabe von Daten in und aus dem Diagnosetestgerät 4 ermöglichen.The input and output device 6 may be formed, for example, as a portable computer (laptop). However, other embodiments of such input and output device 6 are possible as long as they allow the input and output of data in and out of the diagnostic test device 4.

Fig. 2 zeigt eine schematische Darstellung der Funktionsweise der Erfindung. Fig. 2 shows a schematic representation of the operation of the invention.

Kraftstoff ist in einem schematisch gezeigten Kraftstofftank 16 gespeichert und kann über eine Kraftstoffentnahmeleitung 18 aus dem Kraftstofftank 16 entnommen werden. In der Kraftstoffentnahmeleitung 18 ist eine vorzugsweise elektrisch angetriebene Kraftstoffpumpe 14 vorgesehen, die im Betrieb den Kraftstoff durch die Kraftstoffentnahmeleitung 18 aus dem Kraftstofftank 16 entnimmt und unter erhöhtem Druck in eine Kraftstoffdruckleitung 20 ausgibt.Fuel is stored in a fuel tank 16 shown schematically and may be removed from the fuel tank 16 via a fuel extraction line 18. In the fuel extraction line 18, a preferably electrically driven fuel pump 14 is provided, which takes the fuel through the fuel extraction line 18 from the fuel tank 16 during operation and outputs under elevated pressure in a fuel pressure line 20.

Die Kraftstoffpumpe 14 wird über eine Steuerleitung 12 vom Steuergerät 8 des Kraftfahrzeugs 2 angesteuert.The fuel pump 14 is actuated via a control line 12 from the control unit 8 of the motor vehicle 2.

Im normalen Betrieb ist die Kraftstoffdruckleitung mit einer, in der Fig. 2 nicht gezeigten, Einspritzvorrichtung des Motors des Kraftfahrzeugs 2 verbunden, um dieser im Betrieb den notwendigen Kraftstoff zuzuführen.In normal operation, the fuel pressure line is one in which Fig. 2 not shown, injection device of the engine of the motor vehicle 2 connected to supply the latter during operation the necessary fuel.

Um den Kraftstofftank 16 erfindungsgemäß zu entleeren, wird die Kraftstoffdruckleitung 20, z.B. durch einen Schlauch, mit einem externen Behälter 22 verbunden, der ausgebildet ist, um aus dem Kraftstofftank 16 entnommenen Kraftstoff aufzunehmen.In accordance with the invention, to empty the fuel tank 16, the fuel pressure line 20, e.g. by a hose connected to an external reservoir 22 adapted to receive fuel taken from the fuel tank 16.

In der Kraftstoffdruckleitung 20 ist ein Durchflussmesser 24 vorgesehen, der es ermöglicht, die durch die Kraftstoffdruckleitung 20 fließende Kraftstoffmenge zu messen.In the fuel pressure line 20, a flow meter 24 is provided, which makes it possible to measure the amount of fuel flowing through the fuel pressure line 20.

Alternativ kann auch eine Messvorrichtung vorgesehen sein, die beispielsweise anhand der Füllstandshöhe des Kraftstoffs im externen Behälter 22 oder der Gewichtszunahme des externen Behälters 22, die aus dem Kraftstofftank 16 entnommene und in den externen Behälter 22 eingebrachte Kraftstoffmenge misst.Alternatively, a measuring device may be provided, which measures, for example, based on the level of the fuel in the external container 22 or the weight gain of the external container 22, which taken from the fuel tank 16 and introduced into the external container 22 amount of fuel.

Erfindungsgemäß ist das Steuergerät 8, wie bereits in der Fig. 1 gezeigt, über eine erste Datenleitung 10 mit einem erfindungsgemäßen Diagnosetestgerät 4 verbunden.According to the invention, the control unit 8, as already in the Fig. 1 shown connected via a first data line 10 with a diagnostic test device 4 according to the invention.

Um Kraftstoff aus dem Kraftstofftank 16 zu fördern, steuert das Diagnosetestgerät 4 durch entsprechende Signale auf der Datenleitung 10 das Steuergerät 8 derart an, dass das Steuergerät 8 über die weitere Steuerleitung 12 die Kraftstoffpumpe 14 derart antreibt, dass diese durch die Kraftstoffentnahmeleitung 18 Kraftstoff aus dem Kraftstofftank 16 entnimmt und durch die Kraftstoffdruckleitung 20 in den externen Behälter 22 ausgibt. Insbesondere wird, anders als im normalen Betrieb des Kraftfahrzeugs 2, die Kraftstoffpumpe 14 betrieben, ohne dass der Motor des Kraftfahrzeugs 2 im Betrieb ist.To promote fuel from the fuel tank 16, controls the diagnostic test device 4 by appropriate signals on the data line 10, the control unit 8 such that the control unit 8 via the further control line 12, the fuel pump 14 drives such that this fuel through the fuel extraction line 18 from the Removing fuel tank 16 and outputs through the fuel pressure line 20 into the external container 22. In particular, unlike in the normal operation of the motor vehicle 2, the fuel pump 14 is operated without the engine of the motor vehicle 2 is in operation.

Die durch die Kraftstoffdruckleitung 20 strömende Kraftstoffmenge wird ggf. von dem Durchflussmessgerät 24 gemessen und das Messergebnis an das Diagnosetestgerät 4 zurückgemeldet.The amount of fuel flowing through the fuel pressure line 20 is optionally measured by the flow meter 24 and the measurement result is reported back to the diagnostic test device 4.

Das Diagnosetestgerät 4 kann insbesondere so ausgebildet sein, dass es das Steuergerät 8 derart ansteuert, dass es die Kraftstoffpumpe 14 periodisch in Intervallen von jeweils ca. 30 Sekunden antreibt.The diagnostic test device 4 can in particular be designed so that it controls the control unit 8 such that it drives the fuel pump 14 periodically at intervals of approximately 30 seconds.

Alternativ kann das Diagnosetestgerät 4 das Steuergerät 8 so ansteuern, dass es die Kraftstoffpumpe einmalig über einen längeren Zeitraum von beispielsweise 120s antreibt.Alternatively, the diagnostic test device 4, the control unit 8 to control so that it drives the fuel pump once over a longer period of, for example 120s.

Im Kraftstofftank 16 ist ein Füllstandsensor 26 vorgesehen, der ein Füllstandssignal an das Steuergerät 8 ausgibt. Das Kraftstofffüllstandsignal wird von der Steuervorrichtung 8 oder vorzugsweise vom Diagnosetestgerät 4 ausgewertet und der Betrieb der Kraftstoffpumpe 14 wird gestoppt, wenn sich aus dem Kraftstofffüllstandsignal ergibt, dass der Kraftstofftank 16 vollständig entleert ist. Ein Trockenlaufen und Überhitzen der Kraftstoffpumpe 14 wird so zuverlässig verhindert.In the fuel tank 16, a level sensor 26 is provided which outputs a level signal to the control unit 8. The fuel level signal is evaluated by the controller 8, or preferably by the diagnostic tester 4, and the operation of the fuel pump 14 is stopped when the fuel level signal indicates that the fuel tank 16 is completely depleted. Dry running and overheating of the fuel pump 14 is reliably prevented.

Erfindungsgemäß wird der Betrieb der Kraftstoffpumpe 14 gestoppt, wenn das Durchflussmessgerät 24 feststellt, dass kein Kraftstoff mehr durch die Kraftstoffdruckleitung 20 strömt, so dass die Kraftstoffpumpe 14 trocken läuft und die Gefahr besteht, dass die Kraftstoffpumpe 14 überhitzt und beschädigt wird.According to the invention, the operation of the fuel pump 14 is stopped when the flow meter 24 detects that fuel is no longer flowing through the fuel pressure line 20, so that the fuel pump 14 runs dry and there is a risk that the fuel pump 14 is overheated and damaged.

Die Verbindung zwischen dem Diagnosetestgerät 4 und dem Steuergerät 8 erfolgt vorzugsweise über die Standardschnittstelle, die auch zur Diagnosezwecken zur Verbindung des Diagnosetestgeräts 4 mit dem Steuergerät 8 verwendet wird. Am Steuergerät 8 müssen so keine Veränderungen vorgenommen werden. Insbesondere kann das erfindungsgemäße Verfahren mit einem erfindungsgemäßen Diagnosetestgerät 4 auch in Verbindung mit bereits in Kraftfahrzeugen 2 installierten Steuergeräten 8 durchgeführt werden, ohne dass die Kraftfahrzeuge 2 bzw. die darin installierten Steuergeräte 8 nachgerüstet oder ausgetauscht werden müssen.The connection between the diagnostic test device 4 and the control unit 8 is preferably via the standard interface, which is also used for diagnostic purposes for connecting the diagnostic test device 4 to the control unit 8. At the control unit 8 so no changes must be made. In particular, the method according to the invention can also be carried out with a diagnostic test device 4 according to the invention in conjunction with control devices 8 already installed in motor vehicles 2, without the motor vehicles 2 or the control devices 8 installed therein having to be retrofitted or replaced.

Der Anwender wird vorzugsweise vor dem Start der Tankentleerungsfunktion durch das Diagnosetestgerät 4 über die Ein- und Ausgabevorrichtung 6 auf die einzuhaltenden Sicherheitsvorschriften bezüglich Komponentenschutz, Unfallverhütung und Umweltschutz hingewiesen. Insbesondere wird die Entleerung des Kraftstofftanks 16 erst gestartet, nachdem der Anwender bestätigt hat, dass er die angezeigten Sicherheitshinweise gelesen hat.The user is preferably referred to before the start of the tank emptying function by the diagnostic test device 4 via the input and output device 6 on the safety regulations to be complied with regard to component protection, accident prevention and environmental protection. In particular, the depletion of the fuel tank 16 is not started until the user confirms that he has read the displayed safety instructions.

Ein erfindungsgemäßes Verfahren und eine erfindungsgemäße Vorrichtung ermöglichen sowohl das Messen der Fördermenge der Kraftstoffpumpe 14 zu Diagnosezwecken als auch eine teilweise oder vollständige Entleerung des Kraftstofftanks 16, ohne dass dazu mechanische Eingriffe in das Kraftfahrzeug 2 erforderlich sind. Dies ermöglicht es auch kleinen Werkstätten, ihre Diagnostik-Produktpalette zu erweitern und die Funktionalitäten der Tankentleerung und der Kraftstoffpumpendiagnose anzubieten.An inventive method and a device according to the invention allow both the measurement of the delivery rate of the fuel pump 14 for diagnostic purposes as well as a partial or complete emptying of the fuel tank 16, without the need for mechanical intervention in the motor vehicle 2 are required. This will also allow small workshops to expand their range of diagnostics products and to offer the functions of tank emptying and fuel pump diagnostics.

Die Erfindung stellt eine komfortable und sichere Tankentleerungsfunktion und gleichzeitig eine Kraftstoff-Fördermengenmessung sowohl für Werkstätten als auch für mobile (Pannen-)Hilfskräfte zur Verfügung.The invention provides a comfortable and safe tank emptying function and at the same time a fuel flow rate measurement both for workshops and for mobile (breakdown) auxiliary forces available.

Gebrauchtwagen-, Leasing- und Mietwagen-Firmen und Autoverwerter können überschüssigen oder falsch getankten Kraftstoff einfach und bequem abpumpen, wodurch auf zeitraubende und teure Werkstattbesuche verzichtet werden kann.Used car, leasing and car rental companies and car recyclers can easily and conveniently pump off excess or incorrectly fueled fuel, eliminating the need for time-consuming and expensive garage visits.

Ein Eingriff in das Innere des Kraftfahrzeugs 2, insbesondere seine Elektrik oder sein Steuergerät 8, ist nicht erforderlich, so dass die damit verbundenen Gefahren- und Fehlerquellen ausgeschlossen werden.An intervention in the interior of the motor vehicle 2, in particular its electrical system or its control unit 8, is not required, so that the associated danger and error sources are excluded.

Claims (10)

  1. Method for transferring fuel from the fuel tank (16) of a motor vehicle (2) which has a fuel tank (16), a fuel pump (14) and a control device (8), the method including connecting a diagnostic test device (4) to the control device (8) of the motor vehicle (2) and activating the control device (8) by means of the diagnostic test device (4) in such a way that the control device (8) drives the fuel pump (14) of the motor vehicle (2) so that the fuel pump (14) transfers fuel from the fuel tank (16) of the motor vehicle (2) through a fuel pressure line (20), characterized in that the operation of the fuel pump (14) is stopped if a flowmeter (24) in the fuel pressure line (20) determines that no more fuel is flowing through the fuel pressure line (20).
  2. Method according to Claim 1, wherein the method includes connecting an outlet of the fuel pump (14) to an external container (22) before driving the control device (8).
  3. Method according to Claim 1 or 2, wherein the diagnostic test device (4) activates the control device (8) over at least one defined time period.
  4. Method according to Claim 3, wherein the defined time period is 30 seconds or 120 seconds.
  5. Method according to Claim 3 or 4, wherein the diagnostic test device (4) activates the control device (8) periodically over a number of defined time periods.
  6. Method according to one of Claims 3 to 5, wherein the method includes determining the quantity of fuel transferred during a defined time period.
  7. Method according to one of the preceding claims, wherein the diagnostic device reads a fuel tank level signal from the control device (8) and activates the control device (8) on the basis of the fuel tank level signal.
  8. Method according to one of the preceding claims, wherein the control device (8) is activated for so long and/or so often that the fuel tank (16) is completely emptied.
  9. Diagnostic test device (4) for a motor vehicle (2) having a fuel tank (16) and a control device (8), the diagnostic test device (4) being designed to be connected electrically to the control device (8) of the motor vehicle (2), the diagnostic test device (4) being designed to activate the control device (8) in such a way that it drives the fuel pump (14) of the motor vehicle (2) in order to transfer fuel from the fuel tank (16) of the motor vehicle (2) through a fuel pressure line (20), characterized in that the operation of the fuel pump (14) is stopped if a flowmeter (24) in the fuel pressure line (20) determines that no more fuel is flowing through the fuel pressure line (20).
  10. Diagnostic test device (4) according to Claim 9, which is designed to carry out a method according to one of Claims 2 to 8.
EP12185622.3A 2011-10-06 2012-09-24 Method and device for transferring fuel from the fuel tank of a motor vehicle Active EP2578529B1 (en)

Applications Claiming Priority (1)

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DE102011084074A DE102011084074A1 (en) 2011-10-06 2011-10-06 Method and device for conveying fuel from the fuel tank of a motor vehicle

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EP2578529A1 EP2578529A1 (en) 2013-04-10
EP2578529B1 true EP2578529B1 (en) 2015-02-25

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US6505123B1 (en) 2000-07-24 2003-01-07 Weatherbank, Inc. Interactive weather advisory system
EP3225680A1 (en) * 2016-03-29 2017-10-04 Per Tunestal Method of reconditioning a compression-ignition engine system

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DE10247173A1 (en) * 2002-10-10 2004-04-22 Daimlerchrysler Ag Multi-chamber fuel tank for motor vehicles, esp. saddle tank has suction pipes combined in common suction connection, with float valves for suction points, for independent draining of tank
US7171995B2 (en) * 2005-01-25 2007-02-06 Eshenour Richard E Fuel-recovery system and method
GB0525134D0 (en) * 2005-12-09 2006-01-18 Itt Mfg Enterprises Inc Refuelling pumps
US20090283174A1 (en) * 2008-05-16 2009-11-19 Mitchell Steven C Fuel reclamation device
US20110197855A1 (en) * 2010-01-29 2011-08-18 Eric Johnson Apparatus and Method For Recovering Fuel

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DE102011084074A1 (en) 2013-04-11

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