EP1554486A1 - Pump unit - Google Patents

Pump unit

Info

Publication number
EP1554486A1
EP1554486A1 EP03757927A EP03757927A EP1554486A1 EP 1554486 A1 EP1554486 A1 EP 1554486A1 EP 03757927 A EP03757927 A EP 03757927A EP 03757927 A EP03757927 A EP 03757927A EP 1554486 A1 EP1554486 A1 EP 1554486A1
Authority
EP
European Patent Office
Prior art keywords
fuel
pump
tank
starting
supply system
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.)
Granted
Application number
EP03757927A
Other languages
German (de)
French (fr)
Other versions
EP1554486B1 (en
Inventor
Andreas Glenz
Eberhard Holder
Guenter Hoenig
Martin Matt
Andreas Posselt
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
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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 DaimlerChrysler AG, Robert Bosch GmbH filed Critical DaimlerChrysler AG
Publication of EP1554486A1 publication Critical patent/EP1554486A1/en
Application granted granted Critical
Publication of EP1554486B1 publication Critical patent/EP1554486B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/16—Other means for enriching fuel-air mixture during starting; Priming cups; using different fuels for starting and normal operation
    • F02M1/165—Vaporizing light fractions from the fuel and condensing them for use during starting
    • 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
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir

Definitions

  • the invention relates to a fuel supply system for an internal combustion engine according to the features specified in the preamble of claim 1.
  • Such a fuel supply system is known from DE 197 34 493 Cl.
  • This fuel supply system is equipped with a fuel tank for liquid fuel, from which a fuel feed line leads to an injection device, with an evaporating and condensing device for low-boiling fuel components, which is connected to the fuel tank, with one of the evaporating and
  • condensing device downstream intermediate tank for the condensate, from which a condensate line leads to a control valve regulating the supply to the injection device, and provided with a residual fuel return line which discharges the high-boiling residual fuel components occurring in the evaporation and condensing device.
  • Residual fuel return line flows into an additional tank, from which a residual fuel supply line leads to a changeover valve arranged in the fuel supply line.
  • the control of the valve is such that the residual fuel from the residual fuel supply line is fed into the fuel supply line leading to the injection device at least partially at full load of the internal combustion engine.
  • the object of the invention is therefore to provide a fuel supply system for an internal combustion engine which has only a small construction volume and a low construction weight in connection with a reduced pollutant emission during the various operating phases of the motor vehicle.
  • the invention achieves the above-mentioned object in that the gas pump, the electric motor and the fuel pump form a pump unit in the fuel supply system, the electric motor being installed in such a way that it can drive both pumps.
  • a clutch is provided between the fuel pump and the electric motor and / or between the electric motor and gas pump.
  • a very advantageous development of the invention according to claim 2 is that at least one control valve on the suction and pressure side of the fuel pump is arranged that liquid fuel from the fuel tank, also referred to as the main fuel tank, or fuel with low-boiling proportions from the additional tank, also referred to as the starting fuel tank, can be optionally requested with the fuel pump.
  • excess fuel with low-boiling components can also be returned to the auxiliary tank via a fuel return line by means of a fuel pump.
  • a starting fuel that has been obtained can be saved in this way, in order to have it available in a very short time, for example in cold start situations, in order to reduce the exhaust gas emissions.
  • the significant reduction in pollutant emissions, in particular in the emission of hydrocarbons advantageously results in a reduction in the noble metal content of the
  • the pump unit of the fuel supply system is installed in the fuel tank of a vehicle.
  • the device according to the invention is suitable due to the advantages mentioned for use in all mobile systems, such as passenger and commercial vehicles.
  • Fig. 1 shows a preferred embodiment of the
  • Fig. 2 shows the operation of a fuel supply system with main fuel after warming up or when the motor vehicle is warm started
  • Fig. 3 is a rinse of the fuel pump with starting fuel before the start of the internal combustion engine
  • Fig. 4 shows the operation of a fuel supply system with starting fuel when cold starting and warming up the motor vehicle
  • Fig. 5 an initial filling with starting fuel
  • Fig. 6 shows the operation of the gas pump
  • Fig. 1 comprises a system as a whole
  • Fuel supply system the operating modes or functions of the system shown in FIGS. 2 to 6: operation with main fuel, spooling with starting fuel, operation with starting fuel, initial filling with starting fuel and the operation of the gas pump, which are explained below.
  • the overall system advantageously allows, on the one hand, the production of starting fuel and, on the other hand, the management of the demand for main fuel and starting fuel.
  • 1 shows a pump unit consisting of a fuel pump 2, an electric motor 3 and a gas pump 4.
  • a coupling 7 is provided between the fuel pump 2 and the electric motor 3
  • a coupling 8 is provided between the electric motor 3 and the gas pump 4.
  • the fuel pump 2 arranged between a valve 5 and 6 draws in main fuel from the main fuel tank 1, with a corresponding valve position 5.
  • the main fuel passes through a valve 6 into the main fuel line 9 to an injection valve 12.
  • a fuel pressure regulator 11 Between valve 6 and the Injection valve 12 is located in the main fuel line 9, a fuel pressure regulator 11, with a return line 14 to the main fuel tank 1 starting from the fuel pressure regulator 11.
  • An additional valve 10 is located in the main fuel line 9 between the valve 6 and the fuel pressure regulator 11.
  • valve 5 is now set so that the fuel pump 2 driven by the electric motor 3 draws starting fuel from a starting fuel tank 13, which can be introduced either via the valve 6 into the main fuel line 9 or into the starting fuel line 15.
  • a fuel pressure regulator 17 is located in the starting fuel line 15 between the valve 6 and the injection valve 12, a return line 18 to the starting fuel tank 13 starting from the fuel pressure regulator 17.
  • the basic drawing shows the operation of a
  • Valve 5 in particular a 3-way valve, preferably an electrically operated solenoid valve, is set so that the fuel pump 2 sucks main fuel out of the main fuel vehicle tank 1.
  • a valve 6 in particular a 3-way valve, preferably an electrically operated solenoid valve, the main fuel enters the main fuel line 9 to the injection valve 12, which controls the injection into the internal combustion engine (not shown in more detail).
  • a lance-shaped fuel distributor with a check valve integrated into the lance can also be provided.
  • a fuel pressure regulator 11 regulates the injection pressure into the internal combustion engine.
  • An additional valve 10, preferably a check valve is located in the main fuel line between valve 6 and fuel pressure regulator 11.
  • the electric motor 3 drives the fuel pump 2 via the closed clutch 7.
  • Clutch 8 is open in this process.
  • the valve 5 is set such that the fuel pump 2 sucks starting fuel from the starting fuel tank 13 and delivers it via a valve 6 into the main fuel line 9.
  • the starting fuel reaches the main fuel tank 1 via a fuel pressure regulator 11 and a fuel return line 14.
  • the injection valve 12 for the internal combustion engine remains closed during this process.
  • valve 6 is switched over in such a way that the starting fuel reaches the starting fuel line 15, shown in FIG. 4.
  • a fuel pressure regulator 17 there is an additional valve 16, preferably a check valve, in the starting fuel line 15.
  • the cold internal combustion engine can now be started. When the engine is cold started and warmed up, it is operated with starting fuel.
  • valve 6, as shown in FIG. 4 is set such that the excess starting fuel is over the fuel pressure regulator 17 and a starting fuel return line 18 get back into the starting fuel tank 13. This saves starting fuel in an extremely advantageous manner. After warming up is switched to the operation with main fuel, as described in Fig. 2.
  • the initial filling with starting fuel takes place, as shown in FIG. 5, during the initial start-up or after a repair, since in this situation there is still no starting fuel in the starting fuel tank 13 and in the strong fuel line 15. So that the first start with starting fuel can already take place and the starting fuel line 15 can be filled, a small amount of starting fuel is filled into the main fuel tank 1.
  • the electric motor 3 drives the fuel pump 2 via the closed clutch 7.
  • the clutch 8 is open.
  • Valve 5 is set so that the fuel pump 2 sucks starting fuel from the main fuel tank 1. Via the valve 6, the starting fuel enters the starting fuel line 15 to the injection valve 12 of the internal combustion engine.
  • the internal combustion engine can now be started.
  • the excess starting fuel comes back into the starting fuel tank 13 and fills it up via the fuel regulator 17 and the starting fuel pressure line 18. If the upper limit value is displayed during the warm-up by the full-level meter 19 in the starting fuel tank, the valve 5 is switched over in such a way that the fuel pump 2 now draws starting fuel from the starting fuel tank, as shown in FIG. 4, until the warm-up is completed.
  • the main fuel tank 1 can then be filled with main fuel.
  • the consumed starting fuel must be replenished by the operation of the gas pump 4 of the fuel fractionation unit.
  • the clutch 8 is closed during operation with main fuel, so that the gas feed pump 4 is also driven. This sucks air and fuel vapor out of the main fuel tank 1 and compresses the mixture. The mixture cools in a subsequent heat exchanger 20, so that the fuel components condense. The remaining air conveys the fuel condensate into the starting fuel tank 13, after which
  • Pressure relief valve 21 relaxes to ambient pressure and reaches the main fuel tank 1 again via a distributor pipe. When the air bubbles rise, they accumulate with the lower-boiling fuel component. The cycle begins again. If the level meter 19 shows the upper limit value during the fractionation, the fractionation is ended by opening the coupling 8. If the internal combustion engine is switched off before the upper limit value is reached, this means the fuel pump 2 is switched off at the same time. So that the fractionation can still be continued until the upper fill level is reached, the clutch 7 can be opened and fractionated to the end.
  • the promotion of the main fuel takes place separately from the promotion of the starting fuel. This implies two separate drives for the respective pumps of the two separate systems.
  • the combination of the fuel supply unit comprising a pump unit and a starting fuel tank, results in - which in the main fuel tank of an internal combustion engine are integrated into one structural unit, advantageously on the one hand a reduction in the volume of such a fuel supply unit and also a substantially lower construction expenditure, as it would have been necessary if the two systems were operated separately.
  • the elimination of the additional drive leads to a cost reduction in the manufacture of the component.
  • the invention also allows the immediate filling of the main fuel tank with starting fuel when a vehicle is started up for the first time by means of a pump (the fuel pump 2) by switching the valves 5 and 6 accordingly. At this point, this in turn contributes to reducing emissions.
  • the mode of operation of the fuel fractionation unit is based on the idea of trailing gas fractionation and is described in detail in the patent DE 199 27 177 Cl.

Abstract

The invention relates to a fuel supply unit for an internal combustion engine. The gas feed pump, the fuel pump and the electric motor comprises in the fuel supply unit form a pump unit, whereby the electric motor is installed such as to be able to drive both pumps.

Description

DaimlerChrysler AG undDaimlerChrysler AG and
Robert Bosch GmbHRobert Bosch GMBH
Pumpeneinheitpump unit
Die Erfindung betrifft eine Kraftstoffversorgungsanlage für eine Brennkraftmaschine gemäß den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen.The invention relates to a fuel supply system for an internal combustion engine according to the features specified in the preamble of claim 1.
Eine derartige Kraftstoffversorgungsanlage ist aus DE 197 34 493 Cl bekannt. Diese Kraftstoffversorgungsanlage ist mit einem Kraftstofftank für flussigen Kraftstoff, von dem aus eine KraftstoffZuleitung zu einer Einspritzvorrichtung führt, mit einer Verdampfungs- und Kondensierungseinrichtung für niedrig siedende Kraftstoffanteile, die mit dem Kraftstofftank verbunden ist, mit einem der Verdampfungs- undSuch a fuel supply system is known from DE 197 34 493 Cl. This fuel supply system is equipped with a fuel tank for liquid fuel, from which a fuel feed line leads to an injection device, with an evaporating and condensing device for low-boiling fuel components, which is connected to the fuel tank, with one of the evaporating and
Kondensierungseinrichtung nachgeschalteten Zwischentank für das Kondensat, von dem aus eine Kondensatleitung zu einem die Zufuhr zu der Einspritzeinrichtung regelnden Steuerventil fuhrt, und mit einer die in der Verdampfungs- und Kondensierungseinrichtung anfallenden hoher siedenden Restkraftstoffanteile abfuhrenden Restkraftstoffruckleitung versehen. DieProvided condensing device downstream intermediate tank for the condensate, from which a condensate line leads to a control valve regulating the supply to the injection device, and provided with a residual fuel return line which discharges the high-boiling residual fuel components occurring in the evaporation and condensing device. The
Restkraftstoffruckleitung mundet in einen Zusatztank, von dem aus eine RestkraftstoffZuleitung zu einem in der KraftstoffZuleitung angeordneten Umschaltventil fuhrt. Die Steuerung des Ventils ist derart, daß der Restkraftstoff aus der RestkraftstoffZuleitung in die zu der Einspritzeinrichtung fuhrende KraftstoffZuleitung wenigstens teilweise bei Vollast der Brennkraftmaschine zugeführt wird. Aufgrund der heute weltweit geforderten Einhaltung der gesetzlich festgeschriebenen Abgasemissionsgrenzwerte werden an Bord eines mit Verbrennungsmotoren betriebenen Kraftfahrzeugs eine Kraftstoffversorgungsanlage mit einer Kraftstoff-fraktionierungsemrichtung zur Herstellung von niedrig siedenden Kraftstoffanfeilen benotigt, um die wahrend des Betriebs des Kraftfahrzeuges entstehenden Schadstoffemissionen in der Kaltstart- und/oder Warmlaufphase zu reduzieren und den Schadstoffausstoß insgesamt zu vermindern. Solche Anlagen sind häufig apparativ relativ komplex und aufwendig konzipiert und benotigen daher ein großes Bauvolumen mit einem entsprechendem Baugewicht.Residual fuel return line flows into an additional tank, from which a residual fuel supply line leads to a changeover valve arranged in the fuel supply line. The control of the valve is such that the residual fuel from the residual fuel supply line is fed into the fuel supply line leading to the injection device at least partially at full load of the internal combustion engine. Due to the worldwide compliance with the legally stipulated exhaust emission limit values, a fuel supply system with a fuel fractionation device for producing low-boiling fuel parts is required on board a motor vehicle operated with internal combustion engines in order to reduce the pollutant emissions that occur during the operation of the motor vehicle in the cold start and / or warm-up phase to reduce and reduce overall emissions. Such systems are often relatively complex in terms of equipment and are designed in a complex manner and therefore require a large construction volume with a corresponding construction weight.
Aufgabe der Erfindung ist es daher, eine Kraftstoffversorgungsanlage für eine Brennkraftmaschine zur Verfugung zu stellen, die nur ein geringes Bauvolumen und ein geringes Baugewicht in Verbindung mit einer wahrend der verschiedenen Betriebsphasen des Kraftfahrzeugs reduzierten Schadstoffemission aufweist.The object of the invention is therefore to provide a fuel supply system for an internal combustion engine which has only a small construction volume and a low construction weight in connection with a reduced pollutant emission during the various operating phases of the motor vehicle.
Diese Aufgabe wird mit der Vorrichtung nach Anspruch 1 gelost. Vorteilhafte Ausfuhrungen der Erfindung sind Gegenstand der Unteranspruche und der Beschreibung.This object is achieved with the device according to claim 1. Advantageous embodiments of the invention are the subject of the dependent claims and the description.
Die Erfindung lost obengenannte Aufgabe, indem die Gasforderpumpe, der Elektromotor und die Kraftstoffpumpe in der Kraftstoffversorgungsanlage eine Pumpeneinheit bilden, wobei der Elektromotor derart eingebaut ist, daß er beide Pumpen antreiben kann. Gemäß einer besonders bevorzugten Ausfuhrungsform der erfindungsge aßen Kraftstoff-versorgungsanlage ist zwischen Kraftstoffpumpe und Elektromotor und/oder zwischen Elektromotor und Gasforderpumpe eine Kupplung vorgesehen.The invention achieves the above-mentioned object in that the gas pump, the electric motor and the fuel pump form a pump unit in the fuel supply system, the electric motor being installed in such a way that it can drive both pumps. According to a particularly preferred embodiment of the fuel supply system according to the invention, a clutch is provided between the fuel pump and the electric motor and / or between the electric motor and gas pump.
Eine sehr vorteilhafte Weiterbildung der Erfindung besteht gemäß Anspruch 2 darin, daß auf der Saug- und Druckseite der Kraftstoffpumpe mindestens ein Regelventil derart angeordnet ist, daß flussiger Kraftstoff aus dem Kraftstofftank, auch als Hauptkraftstofftank bezeichnet, oder Kraftstoff mit niedrig siedenden Anteilen aus dem Zusatztank, auch als Startkraftstofftank bezeichnet, mit der Kraftstoffpumpe wahlweise forderbar ist. Erfindungsgemaß ist außerdem mittels Kraftstoffpumpe überschüssiger Kraftstoff mit niedrig siedenden Anteilen über eine Kraftstoffruckleitung in den Zusatztank ruckfuhrbar. Als ein weiterer Vorteil laßt sich auf diese Weise ein einmal gewonnener Startkraftstoff sparen, um ihn beispielsweise in Kaltstartsituationen zur Reduzierung der Abgasemissionen in kürzester Zeit zur Verfugung zu haben. Durch die deutliche Verminderung der Schadstoffemission, insbesondere bei der Emission von Kohlenwasserstoffen, resultiert daraus vorteilhafterweise zum einen eine Reduzierung des Edelmetallgehalts bei denA very advantageous development of the invention according to claim 2 is that at least one control valve on the suction and pressure side of the fuel pump is arranged that liquid fuel from the fuel tank, also referred to as the main fuel tank, or fuel with low-boiling proportions from the additional tank, also referred to as the starting fuel tank, can be optionally requested with the fuel pump. According to the invention, excess fuel with low-boiling components can also be returned to the auxiliary tank via a fuel return line by means of a fuel pump. As a further advantage, a starting fuel that has been obtained can be saved in this way, in order to have it available in a very short time, for example in cold start situations, in order to reduce the exhaust gas emissions. The significant reduction in pollutant emissions, in particular in the emission of hydrocarbons, advantageously results in a reduction in the noble metal content of the
Abgaskatalysatoren, zum anderen ein Wegfall der motornahen Katalysatoren, die aufgrund der hohen Temperaturen in diesem Bereich einer starken Alterung unterworfen waren.Exhaust gas catalysts, on the other hand a loss of the catalytic converters close to the engine, which were subject to severe aging due to the high temperatures in this area.
Als ein weiteres wichtiges Merkmal ist die Pumpeneinheit der Kraftstoffversorgungsanlage in den Kraftstofftank eines Fahrzeugs eingebaut.As a further important feature, the pump unit of the fuel supply system is installed in the fuel tank of a vehicle.
Die erfindungsgemaße Vorrichtung eignet sich aufgrund der genannten Vorteile für den Einsatz in allen mobilen Systemen, wie Personen- und Nutzfahrzeuge.The device according to the invention is suitable due to the advantages mentioned for use in all mobile systems, such as passenger and commercial vehicles.
Die Erfindung wird nun anhand der beigefugten Zeichnung weiter beschrieben. In dieser zeigt in schematischer Darstellung als ein Beispiel:The invention will now be further described with reference to the accompanying drawing. This shows in a schematic representation as an example:
Fig. 1 eine bevorzugte Ausfuhrungsform desFig. 1 shows a preferred embodiment of the
Gesamtsystems einer Kraftstoffversorgungsanlage Fig. 2 den Betrieb einer Kraftstoffversorgungsanlage mit Hauptkraftstoff nach Abschluß des Warmlaufs bzw. beim Warmstart des KraftfahrzeugsComplete system of a fuel supply system Fig. 2 shows the operation of a fuel supply system with main fuel after warming up or when the motor vehicle is warm started
Fig. 3 eine Spulung der Kraftstoffpumpe mit Startkraftstoff vor dem Start des VerbrennungsmotorsFig. 3 is a rinse of the fuel pump with starting fuel before the start of the internal combustion engine
Fig. 4 den Betrieb einer Kraftstoffversorgungsanlage mit Startkraftstoff beim Kaltstart und Warmlauf des KraftfahrzeugsFig. 4 shows the operation of a fuel supply system with starting fuel when cold starting and warming up the motor vehicle
Fig. 5 eine Erstbefullung mit StartkraftstoffFig. 5 an initial filling with starting fuel
Fig. 6 den Betrieb der GasforderpumpeFig. 6 shows the operation of the gas pump
Fig. 1 umfaßt als Gesamtsystem einerFig. 1 comprises a system as a whole
Kraftstoffversorgungs-anlage die in den Fig. 2 bis 6 dargestellten Betriebsarten oder Funktionen der Anlage: Betrieb mit Hauptkraftstoff, Spulung mit Startkraftstoff, Betrieb mit Startkraftstoff, Erstbefullung mit Startkraftstoff und den Betrieb der Gasforderpumpe, welche nachstehend erläutert werden. Das Gesamtsystem erlaubt vorteilhafterwe se zum einen die Herstellung von Startkraftstoff und zum anderen gleichzeitig das Managen der Forderung von Hauptkraftstoff und Startkraftstoff. Fig. 1 zeigt eine Pumpeneinheit bestehend aus einer Kraftstoffpumpe 2, einem Elektromotor 3 und einer Gasforderpumpe 4. Zwischen Kraftstoffpumpe 2 und dem Elektromotor 3 ist eine Kupplung 7 bzw. zwischen Elektromotor 3 und Gasforderpumpe 4 ist eine Kupplung 8 vorgesehen. Die zwischen einem Ventil 5 und 6 angeordnete Kraftstoffpumpe 2 saugt Hauptkraftstoff aus dem Hauptkraftstofftank 1 an, bei entsprechender Ventilstellung 5. Über ein Ventil 6 gelangt der Hauptkraftstoff in die Hauptkraftstoffleitung 9 zum einem Emspritzventil 12. Zwischen Ventil 6 und dem Emspritzventil 12 befindet sich in der Hauptkraftstoffleitung 9 ein Kraftstoffdruckregler 11, wobei ausgehend von dem Kraftstoffdruckregier 11 eine Rucklaufleitung 14 zum Hauptkraftstofftank 1 vorgesehen ist. Zwischen Ventil 6 und dem Kraftstoffdruckregler 11 befindet sich in der Hauptkraftstoffleitung 9 noch ein zusätzliches Ventil 10.Fuel supply system, the operating modes or functions of the system shown in FIGS. 2 to 6: operation with main fuel, spooling with starting fuel, operation with starting fuel, initial filling with starting fuel and the operation of the gas pump, which are explained below. The overall system advantageously allows, on the one hand, the production of starting fuel and, on the other hand, the management of the demand for main fuel and starting fuel. 1 shows a pump unit consisting of a fuel pump 2, an electric motor 3 and a gas pump 4. A coupling 7 is provided between the fuel pump 2 and the electric motor 3, and a coupling 8 is provided between the electric motor 3 and the gas pump 4. The fuel pump 2 arranged between a valve 5 and 6 draws in main fuel from the main fuel tank 1, with a corresponding valve position 5. The main fuel passes through a valve 6 into the main fuel line 9 to an injection valve 12. Between valve 6 and the Injection valve 12 is located in the main fuel line 9, a fuel pressure regulator 11, with a return line 14 to the main fuel tank 1 starting from the fuel pressure regulator 11. An additional valve 10 is located in the main fuel line 9 between the valve 6 and the fuel pressure regulator 11.
Das Ventil 5 ist nun so eingestellt, daß d e durch den Elektromotor 3 angetriebene Kraftstoffpumpe 2 Startkraftstoff aus einem Startkraftstofftank 13 ansaugt, welcher entweder über das Ventil 6 in die Hauptkraftstoffleitung 9 oder in die Startkraftstoffleitung 15 eingebracht werden kann. Zwischen Ventil 6 und dem Einspritzventil 12 befindet sich in der Startkraftstoffleitung 15 ein Kraftstoffdruckregler 17, wobei ausgehend von dem Kraftstoffdruckregier 17 eine Rucklaufleitung 18 zum Startkraftstofftank 13 vorgesehen ist. Zwischen Ventil β und dem Kraftstoffdruckregler 17 befindet sich ebenfalls ein zusätzliches Ventil 16.The valve 5 is now set so that the fuel pump 2 driven by the electric motor 3 draws starting fuel from a starting fuel tank 13, which can be introduced either via the valve 6 into the main fuel line 9 or into the starting fuel line 15. A fuel pressure regulator 17 is located in the starting fuel line 15 between the valve 6 and the injection valve 12, a return line 18 to the starting fuel tank 13 starting from the fuel pressure regulator 17. There is also an additional valve 16 between valve β and fuel pressure regulator 17.
Wie in Fig. 2 beispielhaft dargestellt, zeigt die Prinzipzeichnung den Betrieb einerAs shown by way of example in FIG. 2, the basic drawing shows the operation of a
Kraftstoffversorgungsanlage mit Hauptkraftstoff nach Abschluß des Warmlaufs bzw. beim Warmstart des Kraftfahrzeugs. Hierzu treibt der Elektromotor 3 über die geschlossene Kupplung 7 die Kraftstoffpumpe 2 an, wobei die Kupplung 8 offen ist. Ventil 5, insbesondere ein 3- Wege-Ventil, bevorzugt ein elektrisch betriebenes Magnetventil, ist so eingestellt, daß die Kraftstoffpumpe 2 Hauptkraftstoff aus dem Hauptkraftstoff-Fahrzeugtank 1 ansaugt. Über ein Ventil 6, insbesondere ein 3-Wege- Ventil, bevorzugt ein elektrisch betriebenes Magnetventil, gelangt der Hauptkraftstoff in die Hauptkraftstoffleitung 9 zum Emspritzventil 12, das die Einspritzung in den nicht naher dargestellten Verbrennungsmotor steuert. Statt eines Emspritzventils mit seitlichem Rückschlagventil kann auch ein lanzenförmiger Kraftstoffverteiler mit in die Lanze integriertem Rückschlagventil vorgesehen sein. Ein Kraftstoffdruckregler 11 reguliert den Einspritzdruck in den Verbrennungsmotor. Zwischen Ventil 6 und dem Kraftstoffdruckregler 11 befindet sich in der Hauptkraftstoffleitung ein zusätzliches Ventil 10, bevorzugt ein Rückschlagventil.Fuel supply system with main fuel after warming up or when the motor vehicle is warm started. For this purpose, the electric motor 3 drives the fuel pump 2 via the closed clutch 7, the clutch 8 being open. Valve 5, in particular a 3-way valve, preferably an electrically operated solenoid valve, is set so that the fuel pump 2 sucks main fuel out of the main fuel vehicle tank 1. Via a valve 6, in particular a 3-way valve, preferably an electrically operated solenoid valve, the main fuel enters the main fuel line 9 to the injection valve 12, which controls the injection into the internal combustion engine (not shown in more detail). Instead of an injection valve with a side check valve a lance-shaped fuel distributor with a check valve integrated into the lance can also be provided. A fuel pressure regulator 11 regulates the injection pressure into the internal combustion engine. An additional valve 10, preferably a check valve, is located in the main fuel line between valve 6 and fuel pressure regulator 11.
Fig. 3 beschreibt schematisch eine Spülung der Kraftstoffpumpe 2 mit Startkraftstoff vor dem Starten des noch kalten Verbrennungsmotors. In der Kraftstoffpumpe 2 befindet sich ein Totvolumen, das mit Hauptkraftstoff aus dem letzten Abstellvorgang des Fahrzeugs gefüllt ist. Um jedoch den Verbrennungsmotor gleich zu Beginn des Starts mit reinem Startkraftstoff versorgen zu können, ist eine Spülung mit Startkraftstoff erforderlich. Hierzu treibt der Elektromotor 3 über die geschlossene Kupplung 7 die Kraftstoffpumpe 2 an. Kupplung 8 ist bei diesem Vorgang offen. Das Ventil 5 ist so eingestellt, daß die Kraftstoffpumpe 2 Startkraftstoff aus dem Startkraftstofftank 13 ansaugt und über ein Ventil 6 in die Hauptkraftstoffleitung 9 fördert. Der Startkraftstoff gelangt über einen Kraftstoffdruckregier 11 und eine Kraftstoffrücklaufleitung 14 in den Hauptkraftstofftank 1. Das Einspritzventil 12 für den Verbrennungsmotor bleibt bei diesem Vorgang noch geschlossen. Nach kurzer Zeit wird Ventil 6 derart umgeschaltet, daß der Startkraftstoff in die Startkraftstoffleitung 15, dargestellt in Fig. 4, gelangt. Zwischen Ventil 6 und einem Kraftstoffdruckregier 17 befindet sich in der Startkraftstoffleitung 15 noch ein zusätzliches Ventil 16, bevorzugt ein Rückschlagventil. Der kalte Verbrennungsmotor kann jetzt gestartet werden. Beim Kaltstart und Warmlauf des Motors erfolgt der Betrieb mit Startkraftstoff.3 schematically describes a flushing of the fuel pump 2 with starting fuel before starting the still cold internal combustion engine. There is a dead volume in the fuel pump 2, which is filled with main fuel from the last parking process of the vehicle. However, in order to be able to supply the internal combustion engine with pure starting fuel right at the start, a flushing with starting fuel is required. For this purpose, the electric motor 3 drives the fuel pump 2 via the closed clutch 7. Clutch 8 is open in this process. The valve 5 is set such that the fuel pump 2 sucks starting fuel from the starting fuel tank 13 and delivers it via a valve 6 into the main fuel line 9. The starting fuel reaches the main fuel tank 1 via a fuel pressure regulator 11 and a fuel return line 14. The injection valve 12 for the internal combustion engine remains closed during this process. After a short time, valve 6 is switched over in such a way that the starting fuel reaches the starting fuel line 15, shown in FIG. 4. Between the valve 6 and a fuel pressure regulator 17 there is an additional valve 16, preferably a check valve, in the starting fuel line 15. The cold internal combustion engine can now be started. When the engine is cold started and warmed up, it is operated with starting fuel.
Nachdem die Spülung mit Startkraftstoff entsprechend Fig. 3 erfolgt ist, wird das Ventil 6, wie in Fig. 4 gezeigt, so eingestellt, daß der überschüssige Startkraftstoff über den Kraftstoffdruckregler 17 und eine Startkraftstoffrucklauf-leitung 18 zurück in den Startkraftstofftank 13 gelangt. Dies spart in äußerst vorteilhafterweise Startkraftstoff. Nach Abschluß des Warmlaufs wird in den Betrieb mit Hauptkraftstoff umgeschaltet, wie dies in Fig. 2 beschrieben ist.After the purging with starting fuel according to FIG. 3 has taken place, the valve 6, as shown in FIG. 4, is set such that the excess starting fuel is over the fuel pressure regulator 17 and a starting fuel return line 18 get back into the starting fuel tank 13. This saves starting fuel in an extremely advantageous manner. After warming up is switched to the operation with main fuel, as described in Fig. 2.
Die Erstbefullung mit Startkraftstoff erfolgt, wie in Fig. 5 gezeigt, bei Erstbetriebnahme oder nach einer Reparatur, da sich in dieser Situation noch kein Startkraftstoff im Startkraftstofftank 13 und in der Starkraftstoffleitung 15 befindet. Damit trotzdem bereits der erste Start mit Startkraftstoff erfolgen und die Startkraftstoffleitung 15 gefüllt werden kann, wird eine kleine Menge Startkraftstoff m den Hauptkraftstofftank 1 eingefüllt. Der Elektromotor 3 treibt über die geschlossene Kupplung 7 die Kraftstoffpumpe 2 an. Die Kupplung 8 ist hierbei geöffnet. Ventil 5 ist dabei so eingestellt, daß die Kraftstoffpumpe 2 Startkraftstoff aus dem Hauptkraftstofftank 1 ansaugt. Über das Ventil 6 gelangt der Startkraftstoff in die Startkraftstoffleitung 15 zum Einspritzventil 12 des Verbrennungsmotors. Der Verbrennungsmotor kann jetzt gestartet werden. Über den Kraftstoffregler 17 und der Startkraftstoffruckleitung 18 gelangt der überschüssige Startkraftstoff zurück in den Startkraftstofftank 13 und füllt diesen auf. Wird wahrend des Warmlaufs vom Fullstandsmesser 19 im Startkraftstofftank der obere Grenzwert angezeigt, so wird das Ventil 5 in der Weise umgeschaltet, daß die Kraftstoffpumpe 2 jetzt Startkraftstoff aus dem Startkraftstofftank ansaugt, wie in Fig. 4 gezeigt, bis der Warmlauf abgeschlossen ist. Danach kann der Hauptkraftstofftank 1 mit Hauptkraftstoff gefüllt werden.The initial filling with starting fuel takes place, as shown in FIG. 5, during the initial start-up or after a repair, since in this situation there is still no starting fuel in the starting fuel tank 13 and in the strong fuel line 15. So that the first start with starting fuel can already take place and the starting fuel line 15 can be filled, a small amount of starting fuel is filled into the main fuel tank 1. The electric motor 3 drives the fuel pump 2 via the closed clutch 7. The clutch 8 is open. Valve 5 is set so that the fuel pump 2 sucks starting fuel from the main fuel tank 1. Via the valve 6, the starting fuel enters the starting fuel line 15 to the injection valve 12 of the internal combustion engine. The internal combustion engine can now be started. The excess starting fuel comes back into the starting fuel tank 13 and fills it up via the fuel regulator 17 and the starting fuel pressure line 18. If the upper limit value is displayed during the warm-up by the full-level meter 19 in the starting fuel tank, the valve 5 is switched over in such a way that the fuel pump 2 now draws starting fuel from the starting fuel tank, as shown in FIG. 4, until the warm-up is completed. The main fuel tank 1 can then be filled with main fuel.
Nach Abschluß des Warmlaufs muß durch den Betrieb der Gasforderpumpe 4 der Kraftstofffraktionierungseinhe t der verbrauchte Startkraftstoff wieder ergänzt werden. Dies ist in Fig. 6 schematisch dargestellt. Dabei wird während des Betriebs mit Hauptkraftstoff die Kupplung 8 geschlossen, so daß auch die Gasförderpumpe 4 angetrieben wird. Diese saugt Luft und Kraftstoffdampf aus dem Hauptkraftstofftank 1 ab und komprimiert das Gemisch. In einem nachfolgenden Wärmetauscher 20 kühlt das Gemisch ab, so daß die Kraftstoffanteile kondensieren. Die verbliebene Luft fördert das Kraftstoffkondensat in den Startkraftstofftank 13, wird nach demAfter the warm-up has been completed, the consumed starting fuel must be replenished by the operation of the gas pump 4 of the fuel fractionation unit. This is shown schematically in Fig. 6. The clutch 8 is closed during operation with main fuel, so that the gas feed pump 4 is also driven. This sucks air and fuel vapor out of the main fuel tank 1 and compresses the mixture. The mixture cools in a subsequent heat exchanger 20, so that the fuel components condense. The remaining air conveys the fuel condensate into the starting fuel tank 13, after which
Druckentlastungsventil 21 auf Umgebungsdruck entspannt und gelangt über ein Verteilerrohr wieder in den Hauptkraftstofftank 1. Beim Aufsteigen der Luftblasen reichern sich diese mit der niedriger siedenden Kraf stoffkomponente an. Der Kreislauf beginnt erneut. Zeigt der Füllstandsmesser 19 während der Fraktionierung den oberen Grenzwert an, wird durch Öffnen der Kupplung 8 die Fraktionierung beendet. Sollte vor Erreichen des oberen Grenzwerts zwischenzeitlich der Verbrennungsmotor abgestellt werden, bedeutet dies ein gleichzeitiges Abstellen der Kraftstoffpumpe 2. Damit die Fraktionierung trotzdem bis zum Erreichen der oberen Füllstandsmarke fortführbar ist, kann die Kupplung 7 geöffnet werden und zu Ende fraktioniert werden.Pressure relief valve 21 relaxes to ambient pressure and reaches the main fuel tank 1 again via a distributor pipe. When the air bubbles rise, they accumulate with the lower-boiling fuel component. The cycle begins again. If the level meter 19 shows the upper limit value during the fractionation, the fractionation is ended by opening the coupling 8. If the internal combustion engine is switched off before the upper limit value is reached, this means the fuel pump 2 is switched off at the same time. So that the fractionation can still be continued until the upper fill level is reached, the clutch 7 can be opened and fractionated to the end.
Bisher bekannte Lösungen beschreiben einenKnown solutions describe one
Kraftstoffkreislauf eines Fahrzeugs mit einem zusätzlichen Startkraftstoff reislauf zur Emissionsverminderung insbesondere in der Kaltstartphase. Dabei erfolgt die Förderung des Hauptkraftstoffs getrennt von der Förderung des Startkraftstoffs. Dies impliziert zwei getrennte Antriebe für die jeweiligen Pumpen der beiden getrennten Systeme .Fuel circuit of a vehicle with an additional starting fuel circuit to reduce emissions, especially in the cold start phase. The promotion of the main fuel takes place separately from the promotion of the starting fuel. This implies two separate drives for the respective pumps of the two separate systems.
Entsprechend dem vorliegenden Erfindungsgedanken ergeben sich durch das Zusammenfassen der Kraftstoffversorgungseinheit, enthaltend eine Pumpeneinheit und einen Startkraftstofftank - welche in den Hauptkraftstofftank einer Brennkraftmaschine integriert sind- zu einer Baueinheit, vorteilhafterweise zum einen eine Reduktion des Volumens einer solchen Kraftstoffversorgungseinheit wie auch ein wesentlich geringerer Bauaufwand, zum anderen entfallt durch die Verwendung des Elektromotors als Antrieb für beide Pumpensysteme - Kraftstoffpumpe und Gasforderpumpe- ein zusätzlicher Antrieb, wie es im Falle eines getrennten Betriebes beider Systeme notwendig gewesen wäre. Der Wegfall des zusatzlichen Antriebs fuhrt daher zu einer Kostenreduktion bei der Herstellung des Bauteils. Ferner laßt sich im Falle einer Wartung derAccording to the present inventive concept, the combination of the fuel supply unit, comprising a pump unit and a starting fuel tank, results in - which in the main fuel tank of an internal combustion engine are integrated into one structural unit, advantageously on the one hand a reduction in the volume of such a fuel supply unit and also a substantially lower construction expenditure, as it would have been necessary if the two systems were operated separately. The elimination of the additional drive leads to a cost reduction in the manufacture of the component. Furthermore, in the event of maintenance of the
Kraftstoffversorgungseinheit diese ohne großen Aufwand aus dem Kraftstoffbehälter ausbauen. Durch die Kapselung der Pumpeneinheit ergibt sich weiterhin eine gedampfte Gerauschentwicklung. Außerdem laßt sich die so gestaltete Kraftstoffversorgungseinheit problemlos in jeden Kraftstoffbehälter integrieren, ohne daß der jeweilige Kraftstoffbehälter daran angepaßt werden muß. Dies verkürzt die Enzwicklungszeiten erheblich und erspart die Kosten der Anpassung an den jeweiligen Kraftstoffbehälter eines Fahrzeugs. Die Erfindung erlaubt außerdem bei Erstinbetriebnahme eines Fahrzeugs mittels einer Pumpe (der Kraftstoffpumpe 2) durch entsprechendes Schalten der Ventile 5 und 6 die sofortige Befullung des Hauptkraftstofftanks mit Startkraftstoff. Dies tragt an dieser Stelle wiederum zur Emissionsverminderung bei.Remove the fuel supply unit from the fuel tank with little effort. The encapsulation of the pump unit also results in a muffled noise development. In addition, the fuel supply unit designed in this way can be easily integrated into any fuel tank without the respective fuel tank having to be adapted to it. This shortens development times considerably and saves the costs of adapting to the respective fuel tank of a vehicle. The invention also allows the immediate filling of the main fuel tank with starting fuel when a vehicle is started up for the first time by means of a pump (the fuel pump 2) by switching the valves 5 and 6 accordingly. At this point, this in turn contributes to reducing emissions.
Die Arbeitsweise der Kraftstofffraktionierungseinheit beruht auf dem Gedanken der Schleppgasfraktionierung und ist in der Patentschrift DE 199 27 177 Cl ausfuhrlich beschrieben . The mode of operation of the fuel fractionation unit is based on the idea of trailing gas fractionation and is described in detail in the patent DE 199 27 177 Cl.

Claims

DaimlerChrysler AG undRobert Bosch GmbHPatentansprüche DaimlerChrysler AG and Robert Bosch GmbH patent claims
1. KraftstoffVersorgungsanlage für eine1. Fuel supply system for one
Brennkraftmaschine mit einem Kraftstofftank für flüssigen Kraftstoff, von dem aus eine KraftstoffZuleitung zu einer Einspritzvorrichtung führt, mit einer Fraktionierungseinrichtung zur Abtrennung niedrig siedender Kraftstoffanteile, enthaltend eine Funktionsund eine Speichereinheit, wobei die Funktionseinheit eine Gasförderpumpe und einen Elektromotor und die Speichereinheit einen Zusatztank für die niedrig siedenden Kraftstoffanteile umfasst, und mit einer Kraftstoffpumpe, d a d u r c h g e k e n n z e i c h n e t, daß die Gasförderpumpe, der Elektromotor und die Kraftstoffpumpe eine Pumpeneinheit bilden, wobei der Elektromotor derart eingebaut ist, daß er beide Pumpen antreiben kann.Internal combustion engine with a fuel tank for liquid fuel, from which a fuel feed line leads to an injection device, with a fractionation device for separating low-boiling fuel components, comprising a functional unit and a storage unit, the functional unit comprising a gas feed pump and an electric motor, and the storage unit an additional tank for the low-boiling components Includes fuel components, and with a fuel pump, characterized in that the gas feed pump, the electric motor and the fuel pump form a pump unit, the electric motor being installed in such a way that it can drive both pumps.
2. Kraftstof fversorgungsanlage nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß auf der Saug- und Druckseite der Kraftstoffpumpe mindestens ein Regelventil derart angeordnet ist, daß flüssiger Kraftstoff aus dem Kraftstofftank oder Kraftstoff mit niedrig siedenden Anteilen aus dem Zusatztank mit der Kraftstoffpumpe wahlweise förderbar ist.2. Fuel supply system according to claim 1, d a d u r c h g e k e n n z e i c h n e t that at least one control valve is arranged on the suction and pressure side of the fuel pump such that liquid fuel from the fuel tank or fuel with low-boiling proportions from the additional tank is optionally deliverable with the fuel pump.
3. Kraftstoffversorgungsanlage nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß die Pumpeneinheit in den Kraftstofftank eines Fahrzeugs eingebaut ist.3. Fuel supply system according to claim 1, characterized in that that the pump unit is installed in the fuel tank of a vehicle.
4. Kraftstoffversorgungsanlage nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, daß überschüssiger Kraftstoff mit niedrig siedenden Anteilen mittels Kraftstoffpumpe über eine Kraftstoffruckleitung in den Zusatztank rückführbar ist.4. Fuel supply system according to claim 2, d a d u r c h g e k e n e z e i c h n e t that excess fuel with low boiling fractions can be recycled into the additional tank by means of a fuel pump via a fuel return line.
5. Kraftstoffversorgungsanlage nach Anspruch 1, d a d u r c h g e k e n n z e i c h n et, daß zwischen Kraftstoffpumpe und Elektromotor und/oder zwischen Elektromotor und Gasförderpumpe eine Kupplung vorgesehen ist.5. A fuel supply system according to claim 1, that a clutch is provided between the fuel pump and the electric motor and / or between the electric motor and the gas pump.
6. Kraftstoffversorgungsanlage nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t, daß bei Erstinbetriebnahme oder Reparatur eines Kraftfahrzeugs über eine entsprechende Ansteuerung der Regelventile mittels Kraftstoffpumpe eine Erstbefullung des Zusatztanks mit Startkraftstoff aus dem Kraftstofftank durchführbar ist. 6. Fuel supply system according to claim 2, d a d u r c h g e k e n n z e i c h n t that when starting up or repairing a motor vehicle via a corresponding control of the control valves by means of a fuel pump, a first filling of the additional tank with starting fuel from the fuel tank can be carried out.
EP03757927A 2002-10-26 2003-10-09 Pump unit Expired - Lifetime EP1554486B1 (en)

Applications Claiming Priority (3)

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DE10249953 2002-10-26
DE10249953A DE10249953A1 (en) 2002-10-26 2002-10-26 pump unit
PCT/EP2003/011156 WO2004038211A1 (en) 2002-10-26 2003-10-09 Pump unit

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US7055511B2 (en) 2006-06-06
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JP4169005B2 (en) 2008-10-22
WO2004038211A1 (en) 2004-05-06
DE50313425D1 (en) 2011-03-03
EP1554486B1 (en) 2011-01-19
US20050224056A1 (en) 2005-10-13

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