EP1566536B1 - Fuel supplying apparatus and method of controlling the supply of fuel - Google Patents

Fuel supplying apparatus and method of controlling the supply of fuel Download PDF

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Publication number
EP1566536B1
EP1566536B1 EP05002223A EP05002223A EP1566536B1 EP 1566536 B1 EP1566536 B1 EP 1566536B1 EP 05002223 A EP05002223 A EP 05002223A EP 05002223 A EP05002223 A EP 05002223A EP 1566536 B1 EP1566536 B1 EP 1566536B1
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EP
European Patent Office
Prior art keywords
fuel
pressure
line
internal combustion
combustion engine
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EP05002223A
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German (de)
French (fr)
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EP1566536A1 (en
Inventor
Stefan Wolters
Gerd Rosemann
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TI Automotive Neuss GmbH
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TI Automotive Neuss 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
    • 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
    • F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • 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
    • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025—Feeding by means of a liquid fuel-driven jet pump

Definitions

  • the invention relates to a fuel supply system for supplying an internal combustion engine, in particular a motor vehicle, with fuel and a method for controlling the fuel supply of an internal combustion engine.
  • an electric fuel pump in a fuel tank, which promotes fuel via a fuel line to the internal combustion engine.
  • a suction jet pump By the operation of the suction jet pump, it is possible to supply a arranged in a surge pot fuel pump sufficiently with fuel, so that the fuel pump promotes enough fuel to supply the internal combustion engine.
  • the electric fuel pump and / or the number of Saugstrahlpumpen used is deliberately oversized to provide sufficient fuel when starting the internal combustion engine, if only a low on-board voltage for operating the electric fuel pump is present. Due to the oversizing, such fuel supply systems are expensive and require accordingly large space. Furthermore, it takes a very long time to reach the desired operating state of the internal combustion engine after starting, since a large part of the delivered fuel quantity is not used for the internal combustion engine but for the intended suction jet pumps.
  • a fuel supply system for supplying an internal combustion engine in which a fuel pump via a fuel line directs fuel to the internal combustion engine. Connected to the fuel line is a drain which opens at a first pressure to allow a jet pump to deliver fuel to the fuel pump.
  • the fuel supply system has a return line connected to the fuel line, which returns fuel to the fuel pump. In the return line, a safety valve is arranged that opens at a second pressure, which is significantly higher than the operating pressure.
  • the object of the invention is to provide a compact fuel supply system and a method for controlling the fuel supply of an internal combustion engine, each afford a reliable Kraftstoffers- guarantee when starting the engine.
  • the object is achieved by a fuel supply system having the features of claim 1 and a method having the features of claim 8.
  • the fuel supply system according to the invention for supplying an internal combustion engine with fuel has an electric fuel pump which is assigned to a fuel tank, for example one half of a saddle tank, and is arranged in particular within the fuel tank or the saddle tank half.
  • a fuel line is connected, which leads to the internal combustion engine.
  • a return line for returning fuel to the fuel pump.
  • the fuel returned through the return line becomes the tank half of a saddle tank containing the fuel pump is assigned, returned and / or to a surge chamber, which is assigned to the fuel pump.
  • a drain is connected to the fuel line to operate one or more arranged in the fuel tank Saugstrahlpumpen to supply the fuel pump.
  • the fuel supply system has a pressure control system that controls both the connection of the discharge line to the fuel line and the connection of the return line to the fuel line.
  • the pressure control system opens or closes the connection of the discharge line to the fuel line at a first pressure and opens or closes the connection of the return line to the fuel line at a second pressure, wherein the pressure control system opens the discharge line and the return line with increasing pressure and with decreasing Pressure closes.
  • the second pressure is the operating pressure. This means that the discharge line and the return line are closed when starting the internal combustion engine and only after the electric fuel pump has built up a correspondingly high pressure by conveying fuel in the fuel line, the return line and the discharge line are open.
  • the fuel supply system according to the invention can thus be made very compact.
  • the starting process of the internal combustion engine with the aid of the fuel supply system according to the invention can take place so quickly that the fuel present in particular in the surge pot is sufficient to accomplish the starting process even without the operation of a suction jet pump.
  • the drain for operation of the suction jet pump is opened before the return line is opened.
  • the first pressure at which the connection of the discharge line to the fuel line is opened is thus lower than the second pressure at which the connection of the return line to the fuel line is opened, so that the pressure regulating system has different actuating pressures in order to divert fuel from the fuel line.
  • the pressure control system has a first pressure regulator connected to the drain and a second pressure regulator connected to the return line.
  • the pressure regulators are in particular mechanical pressure regulators, such. B. check valves which at a certain pressure, d. H. be operated at the first pressure, or the second pressure, and open or close the derivative, or return line in particular with a proportional to the flow rate characteristic. With the help of the two pressure regulator, a particularly simple and cost-effective pressure control system is formed.
  • the pressure control system may include a 3/3-way valve connected to the fuel line at the input side and the return line and the drain at the output side, respectively.
  • a first switching state of the 3/3-way valve both the derivative and the return line are separated from the fuel line.
  • a second Switching state in which switches the 3/3-way valve at the first pressure, the derivative is connected to the fuel line, while the return line remains closed.
  • the 3/3-way valve switches to a third switching state, in which both the derivative and the return line are connected to the fuel line.
  • a valve with only two switching states ie a 3/2-way valve can be used in which the derivative with the return line are separated in a first switching state and in the second switching state, both the derivative and the return line are connected to the fuel line.
  • the pressure control system can be made very compact and space-saving.
  • the pressure control system is preferably connected to a pressure measuring device, by which the pressure control system is controlled.
  • the pressure of the fuel line is measured, so that the first pressure and the second pressure are pressures of the fuel line.
  • the pressure measurement is preferably carried out hydraulically, for example via a pressure measuring system with a baffle plate or the like.
  • the fuel line to a pressure-holding valve.
  • the pressure-maintaining valve is in particular arranged as close as possible to the fuel pump.
  • the pressure-holding valve connects directly to the fuel pump, so that the pressure-holding valve between the fuel pump and the fuel line is arranged.
  • the pressure-maintaining valve is achieved that after switching off the internal combustion engine as much of the fuel line is filled with fuel having a pressure of more than 1 bar.
  • the fuel line is used not only for conveying fuel, but also for storing fuel, since the fuel in the fuel line has a pressure that is sufficient even without supplying the Krafftstoffpumpe to supply the internal combustion engine.
  • a further pressure-holding valve for example a retention valve, can be provided in order to be able to precisely define the region of the fuel line which is under increased pressure even after the internal combustion engine has been switched off.
  • the invention further relates to a method for controlling the fuel supply of an internal combustion engine, by the particularly simple improved start-up behavior of a particular arranged in a motor vehicle internal combustion engine is achieved.
  • the internal combustion engine is first started. With the start of the internal combustion engine, the Bennkraftmaschine from a fuel having fuel line, which is connected to a fuel pump, supplied. Thereafter, fuel is fed into the fuel line with the aid of the fuel pump. By conveying the fuel pump, the pressure in the fuel line increases. Subsequently, a previously sealed discharge is opened, which is connected to the fuel line and at least one suction jet pump. The discharge opens at a first pressure selected to safely start the engine.
  • the pressure in the discharge increases, in particular, due to the resistance of the suction jet nozzle (s) until the discharge pressure is substantially equal to the second pressure.
  • a previously closed return line is opened, which is connected to the fuel line and returns fuel to the fuel pump out.
  • the opening of the return line takes place at a second pressure, which according to the invention the design pressure, d. H. the operating pressure of the internal combustion engine is.
  • the first pressure and the second pressure are identical, the discharge and the return line are opened simultaneously.
  • the first pressure is lower than the second pressure, so that the discharge is opened before the return line.
  • the fuel line preferably at start of the internal combustion engine, a pressure of more than 1 bar.
  • a pressure of more than 1 bar is provided in the fuel line before starting the internal combustion engine.
  • the internal combustion engine is preferably first switched off. Since this means that the electric fuel pump is no longer supplied with power, the pressure in the fuel line drops. Subsequently, the return line is closed at the second pressure. Thereafter, the derivative is closed at the first pressure. If the first pressure and the second pressure are identical, the return line and the drain are closed at the same time. After closing the discharge, in particular, the method step is carried out that the fuel line is closed by means of a pressure-holding valve. This will leave the pressure in the fuel line slightly lower than the first pressure. Particularly preferred for the inventive method as described above fuel supply system is used.
  • an electric fuel pump 10 is disposed within a baffle 12 in a tank 14, wherein the tank 14 in the illustrated embodiment is a saddle tank.
  • the fuel pump 10 is connected via a pressure-maintaining valve 16 with a fuel line 18, which leads to an internal combustion engine 20.
  • a return line 22 is connected, which returns a portion of the funded by the fuel pump 10 fuel in the swirl pot 12.
  • a discharge line 24 is also connected, via which a part of the pumped fuel is conveyed to a suction jet pump 26.
  • the suction jet pump 26 fuel is entrained by the pumped fuel from the tank 14 and conveyed into the swirl pot 12.
  • the derivative 24 can be opened or closed by means of a first pressure regulator 28.
  • the first pressure regulator 28 is actuated at a first pressure, wherein at a rising pressure in the fuel line 10, the connection to the drain 24 is opened and closed at a decreasing pressure in the fuel line 18.
  • the return line 22 to a second pressure regulator 30 which opens and closes the connection between the return line 23 and the fuel line 18 at a second pressure.
  • the connection of the return line 22 is opened to the fuel line 18 and closed at a decreasing pressure in the fuel line 18.
  • the pressure regulator 28, 30 is achieved that when starting the internal combustion engine 20, when the electric fuel pump 10 is not sufficiently supplied with power, the fuel line 18 is connected only to the internal combustion engine 20.
  • the start of the connecting engine 20 and the start of the fuel pump 10 are accelerated, whereby the fuel supply of the internal combustion engine 20 is improved.
  • the discharge line 24 and the return line 22 are connected to the fuel line 18 via a common intermediate line 32.
  • the intermediate line 32 leads to a branch 34 in which the discharge line 24 and the return line 22 of the intermediate line 32 are connected.
  • the first pressure regulator 28 is formed by a first check valve 36 and the second pressure regulator 30 by a second check valve 38.
  • the check valves 36, 38 are in particular designed such that the check valve 36 opens at a lower pressure than the second check valve 38th
  • the check valves 36, 38 and the branch 34 have been replaced by a 3/3-way valve 40 as compared to the fuel supply system illustrated in FIG.
  • the intermediate connection 32 is connected and at an output side 44 of the 3/3 way system 40, the derivative 24 and the return line 24 are connected.
  • the discharge line 24 and the return line 22 are closed.
  • the derivative 24 is opened, d. H. connected to the fuel line 18 while the return line 22 is closed.
  • both the discharge line 24 and the return line 22 are opened and connected to the fuel line 18.
  • the individual switching states 46, 48, 50 When starting the internal combustion engine 20, the individual switching states 46, 48, 50, starting at the first switching state 46, are traversed by the 3/3-way valve 40 being displaced in the direction of the arrow 52 in the embodiment shown in FIG. After switching off the internal combustion engine 42, the individual switching states 46, 48, 50, starting at the third switching state 50, are run through by the 3/3-way valve 40 being displaced in the direction of the arrow 54.
  • a Pressure measuring device 56 is provided which, depending on the measured pressure in the fuel line 18, the individual switching states 46, 48, 50 drives.
  • the fuel supply system thus comprises a pressure control system 58, which in the first embodiment ( Figure 1) through the two pressure regulators 28, 30, a second embodiment ( Figure 3) through the branch 34 and the check valves 36, 38 and in the third Embodiment (Fig. 3) is formed by the 3/3-way valve 40.

Description

Die Erfindung betrifft ein Kraftstoffversorgungssystem zur Versorgung einer Brennkraftmaschine, insbesondere eines Kraftfahrzeuges, mit Kraftstoff sowie ein Verfahren zur Regelung der Kraftstoffversorgung einer Brennkraftmaschine.The invention relates to a fuel supply system for supplying an internal combustion engine, in particular a motor vehicle, with fuel and a method for controlling the fuel supply of an internal combustion engine.

Zur Versorgung einer Brennkraftmaschine mit Kraftstoff ist es bekannt, eine elektrische Kraftstoffpumpe in einem Kraftstofftank anzuordnen, die über eine Kraftstoffleitung Kraftstoff zur Brennkraftmaschine fördert. Aus DE 199 48 170 A1 ist es bekannt, einen Teil des geförderten Kraftstoffs über eine Ableitung abzuführen, um damit eine Saugstrahlpumpe zu betreiben. Durch den Betrieb der Saugstrahlpumpe ist es möglich, ein in einem Schwalltopf angeordnete Kraftstoffpumpe ausreichend mit Kraftstoff zu versorgen, damit die Kraftstoffpumpe genügend Kraftstoff zur Versorgung der Brennkraftmaschine fördert. Ferner ist es bekannt, einen Teil des von der Kraftstoffpumpe geförderten Kraftstoffs über eine Rückführleitung zur Kraftstoffpumpe, insbesondere in den Schwalltopf zurückzuführen. Dadurch, dass ein Teil des geförderten Kraftstoffs im Kreis gefördert wird, wird die Kühlung der Kraftstoffpumpe erheblich verbessert.To supply an internal combustion engine with fuel, it is known to arrange an electric fuel pump in a fuel tank, which promotes fuel via a fuel line to the internal combustion engine. From DE 199 48 170 A1 it is known to remove a portion of the pumped fuel via a drain, in order to operate a suction jet pump. By the operation of the suction jet pump, it is possible to supply a arranged in a surge pot fuel pump sufficiently with fuel, so that the fuel pump promotes enough fuel to supply the internal combustion engine. Furthermore, it is known to recycle a portion of the fuel delivered by the fuel pump via a return line to the fuel pump, in particular into the swirl pot. The fact that a portion of the pumped fuel is conveyed in a circle, the cooling of the fuel pump is significantly improved.

Bei derartigen Kraftstoffversorgungssystemen ist die elektrische Kraftstoffpumpe und/ oder die Anzahl der verwendeten Saugstrahlpumpen bewusst überdimensioniert, um beim Starten der Brennkraftmaschine, wenn nur eine niedrige Bordspannung zum Betrieb der elektrischen Kraftstoffpumpe vorhanden ist, ausreichend mit Kraftstoff zu versorgen. Auf Grund der Überdimensionierung sind derartige Kraftstoffversorgurigssysteme teuer und benötigen entsprechend großen Bauraum. Ferner dauert es sehr lange, bis nach dem Starten der gewünschte Betriebszustand der Brennkraftmaschine erreicht ist, da ein großer Teil der geförderten Kraftstoffmenge nicht für die Brennkraftmaschine sondern für die vorgesehenen Saugstrahlpumpen verwendet wird.In such fuel supply systems, the electric fuel pump and / or the number of Saugstrahlpumpen used is deliberately oversized to provide sufficient fuel when starting the internal combustion engine, if only a low on-board voltage for operating the electric fuel pump is present. Due to the oversizing, such fuel supply systems are expensive and require accordingly large space. Furthermore, it takes a very long time to reach the desired operating state of the internal combustion engine after starting, since a large part of the delivered fuel quantity is not used for the internal combustion engine but for the intended suction jet pumps.

Ferner ist es aus DE 199 48 170 A1 bekannt, die Förderleistung der elektrischen Kraftstoffpumpe in Abhängigkeit von dem Druck in der Kraftstoffleitung zu regeln. Da insbesondere beim Starten der Brennkraftmaschine der Verlauf der Bordspannung nicht vollständig bekannt ist, ist eine zuverlässige Kraftstoffversorgung der Brennkraftmaschine durch eine Regelung der Kraftstoffpumpe nicht möglich. Um auch beim Starten der Brennkraftmaschine eine zuverlässige Kraftstoffversorgung sicherzustellen, ist somit eine bewusste Überdimensionierung des verwendeten Kraftstoffversorgungssystem erforderlich.Furthermore, it is known from DE 199 48 170 A1 to regulate the delivery rate of the electric fuel pump as a function of the pressure in the fuel line. Since, in particular when starting the internal combustion engine, the course of the on-board voltage is not completely known, a reliable fuel supply to the internal combustion engine by regulating the fuel pump is not possible. In order to ensure a reliable fuel supply even when starting the internal combustion engine, a deliberate oversizing of the fuel supply system used is thus required.

Aus US 2001/00189081 ist ein Kraftstoffversorgungssystem zur Versorgung einer Brennkraftmaschine bekannt, bei dem eine Kraftstoffpumpe über ein Kraftstoffleitung Kraftstoff zu der Brennkraftmaschine leitet. Mit der Kraftstoffleitung ist eine Ableitung verbunden, die bei einem ersten Druck öffnet, damit eine Saugstrahlpumpe Kraftstoff zu der Kraftstoffpumpe fördern kann. Zusätzlich weist das Kraftstoffversorgungssystem eine mit der Kraftstoffleitung verbundene Rückführleitung auf, die Kraftstoff zu der Kraftstoffpumpe zurückführt. In der Rückführleitung ist ein Sicherheitsventil angeordnet, dass bei einem zweiten Druck öffnet, der deutlich höher als der Betriebsdruck ist.From US 2001/00189081 a fuel supply system for supplying an internal combustion engine is known in which a fuel pump via a fuel line directs fuel to the internal combustion engine. Connected to the fuel line is a drain which opens at a first pressure to allow a jet pump to deliver fuel to the fuel pump. In addition, the fuel supply system has a return line connected to the fuel line, which returns fuel to the fuel pump. In the return line, a safety valve is arranged that opens at a second pressure, which is significantly higher than the operating pressure.

Aufgabe der Erfindung ist es, ein kompaktes Kraftstoffversorgungssystem und ein Verfahren zur Regelung der Kraftstoffversorgung einer Brennkraftmaschine zu schaffen, die jeweils beim Starten der Brennkraftmaschine eine zuverlässige Kraftstoffversorgung- gewähr-leisten.The object of the invention is to provide a compact fuel supply system and a method for controlling the fuel supply of an internal combustion engine, each afford a reliable Kraftstoffversorgung- guarantee when starting the engine.

Die Aufgabe wird erfindungsgemäß gelöst durch ein Kraftstoffversorgungssystem mit den Merkmalen des Anspruchs 1 sowie ein Verfahren mit den Merkmalen des Anspruchs 8.The object is achieved by a fuel supply system having the features of claim 1 and a method having the features of claim 8.

Das erfindungsgemäße Kraftstoffversorgungssystem zur Versorgung einer Brennkraftmaschine mit Kraftstoff weist eine elektrische Kraftstoffpumpe auf, die einem Kraftstofftank, beispielsweise einer Hälfte eines Satteltanks, zugeordnet und insbesondere innerhalb des Kraftstofftanks bzw. der Satteltankhälfte angeordnet ist. Mit der Kraftstoffpumpe ist ein Kraftstoffleitung verbunden, die zur der Brennkraftmaschine führt. Mit der Kraftstoffleitung ist eine Rückführleitung zur Rückfuhr von Kraftstoff zu der Kraftstoffpumpe hin verbunden. Beispielsweise wird der durch die Rückführleitung zurückgeführte Kraftstoff zu der Tankhälfte eines Satteltanks, dem die Kraftstoffpumpe zugeordnet ist, zurückgeführt und/ oder zu einem Schwalltopf, dem die Kraftstoffpumpe zugeordnet ist. Mit der Kraftstoffleitung ist eine Ableitung verbunden, um zur Versorgung der Kraftstoffpumpe eine oder mehrere in dem Kraftstofftank angeordnete Saugstrahlpumpen zu betreiben. Das Kraftstoffversorgungssystem weist ein Druckregelsystem auf, das sowohl die Verbindung der Ableitung mit der Kraftstoffleitung als auch die Verbindung der Rückführleitung mit der Kraftstoffleitung steuert. Das Druckregelsystem öffnet, bzw. schließt die Verbindung der Ableitung zur Kraftstoffleitung bei einem ersten Druck und öffnet, bzw. schließt die Verbindung der Rückführleitung mit der Kraftstoffleitung bei einem zweiten Druck, wobei das Druckregelsystem die Ableitung und die Rückführleitung bei ansteigendem Druck öffnet und bei abfallendem Druck schließt. Erfindungsgemäß ist der zweite Druck der Betriebsdruck. Das bedeutet, dass die Ableitung und die Rückführleitung beim Start der Brennkraftmaschine geschlossen sind und erst nachdem die elektrische Kraftstoffpumpe durch das Fördern von Kraftstoff in der Kraftstoffleitung einen entsprechend hohen Druck aufgebaut hat, die Rückführleitung und die Ableitung geöffnet sind.The fuel supply system according to the invention for supplying an internal combustion engine with fuel has an electric fuel pump which is assigned to a fuel tank, for example one half of a saddle tank, and is arranged in particular within the fuel tank or the saddle tank half. With the fuel pump, a fuel line is connected, which leads to the internal combustion engine. Connected to the fuel line is a return line for returning fuel to the fuel pump. For example, the fuel returned through the return line becomes the tank half of a saddle tank containing the fuel pump is assigned, returned and / or to a surge chamber, which is assigned to the fuel pump. A drain is connected to the fuel line to operate one or more arranged in the fuel tank Saugstrahlpumpen to supply the fuel pump. The fuel supply system has a pressure control system that controls both the connection of the discharge line to the fuel line and the connection of the return line to the fuel line. The pressure control system opens or closes the connection of the discharge line to the fuel line at a first pressure and opens or closes the connection of the return line to the fuel line at a second pressure, wherein the pressure control system opens the discharge line and the return line with increasing pressure and with decreasing Pressure closes. According to the invention, the second pressure is the operating pressure. This means that the discharge line and the return line are closed when starting the internal combustion engine and only after the electric fuel pump has built up a correspondingly high pressure by conveying fuel in the fuel line, the return line and the discharge line are open.

Dadurch, dass erfindungsgemäß beim Starten der Brennkraftmaschine sowohl die Rückführleitung als auch die Ableitung geschlossen sind, steht die gesamte, beim Starten der Brennkraftmaschine verhältnismäßig geringe, sofern überhaupt vorhandene Förderleistung allein zur Versorgung der Brennkraftmaschine zur Verfügung. Dadurch, dass beim Start allein die Brennkraftmaschine versorgt wird, erreicht die Brennkraftmaschine sehr schnell ihren Betriebszustand, so dass auch sehr schnell eine zum Betrieb der elektrischen Kraftstoffpumpe ausreichende Bordspannung erreicht wird, wodurch der Druck in der Kraftstoffleitung sehr schnell ansteigt und die Rückführleitung sowie die Ableitung entsprechend schnell zur Kraftstoffversorgung der Kraftstoffpumpe geöffnet werden. Somit wird durch das erfindungsgemäße Kraftstoffversorgungssystem ein verbessertes Startverhalten der Brennkraftmaschine erreicht, wodurch gleichzeitig die elektrische Versorgung verschiedener elektrischer Verbraucher, wie insbesondere die elektrische Kraftstoffpumpe, verbessert ist. Ferner ist es nicht erforderlich, eine überdimensionierte elektrische Kraftstoffpumpe zu verwenden, da beim Start der Brennkraftmaschine nur die Brennkraftmaschine versorgt wird und somit eine geringere Förderleistung ausreicht, um eine zuverlässige Kraftstoffversorgung zu gewährleisten. Das erfindungsgemäße Kraftstoffversorgungssystem kann somit sehr kompakt ausgestaltet sein. Insbesondere kann der Startvorgang der Brennkraftmaschine mit Hilfe des erfindungsgemäßen Kraftstoffversorgungssystems so schnell erfolgen, dass der insbesondere im Schwalltopf vorhandene Kraftstoff ausreicht, um den Startvorgang auch ohne den Betrieb einer Saugstrahlpumpe zu bewerkstelligen.Characterized in that according to the invention both the return line and the discharge are closed when starting the internal combustion engine, the entire, when starting the internal combustion engine relatively low, if any delivery capacity is available solely to supply the internal combustion engine. Characterized in that only the internal combustion engine is supplied at the start, the internal combustion engine reaches its operating state very quickly, so that very quickly enough to operate the electric fuel pump on-board voltage is achieved, whereby the pressure in the fuel line rises very quickly and the return line and the derivative be opened accordingly fast to the fuel supply of the fuel pump. Thus, an improved starting behavior of the internal combustion engine is achieved by the fuel supply system according to the invention, whereby at the same time the electrical supply of various electrical consumers, in particular the electric fuel pump is improved. Furthermore, it is not necessary to have a To use oversized electric fuel pump, since the start of the engine only the engine is powered and thus a lower flow rate sufficient to ensure a reliable fuel supply. The fuel supply system according to the invention can thus be made very compact. In particular, the starting process of the internal combustion engine with the aid of the fuel supply system according to the invention can take place so quickly that the fuel present in particular in the surge pot is sufficient to accomplish the starting process even without the operation of a suction jet pump.

Vorzugsweise wird die Ableitung zum Betrieb der Saugstrahlpumpe geöffnet, bevor die Rückführleitung geöffnet wird. Der erste Druck, bei dem die Verbindung der Ableitung zur Kraftstoffleitung geöffnet wird, ist also niedriger als der zweite Druck, bei dem die Verbindung der Rückführleitung mit der Kraftstoffleitung geöffnet wird, so dass das Druckregelsystem unterschiedliche Betätigungsdrücke aufweist, um Kraftstoff aus der Kraftstoffleitung abzuzweigen.Preferably, the drain for operation of the suction jet pump is opened before the return line is opened. The first pressure at which the connection of the discharge line to the fuel line is opened is thus lower than the second pressure at which the connection of the return line to the fuel line is opened, so that the pressure regulating system has different actuating pressures in order to divert fuel from the fuel line.

In bevorzugter Ausführungsform weist das Druckregelsystem einen mit der Ableitung verbundenen ersten Druckregler und einen mit der Rückführleitung verbundenen zweiten Druckregler auf. Die Druckregler sind insbesondere mechanische Druckregler, wie z. B. Rückschlagventile, die bei einem bestimmten Druck, d. h. bei dem ersten Druck, bzw. dem zweiten Druck, betätigt werden und die Ableitung, bzw. Rückführleitung insbesondere mit einer zum Durchsatz proportionalen Kennlinie öffnen bzw. schließen. Mit Hilfe der zwei Druckregler wird ein besonders einfach aufgebautes und kostengünstiges Druckregelsystem gebildet.In a preferred embodiment, the pressure control system has a first pressure regulator connected to the drain and a second pressure regulator connected to the return line. The pressure regulators are in particular mechanical pressure regulators, such. B. check valves which at a certain pressure, d. H. be operated at the first pressure, or the second pressure, and open or close the derivative, or return line in particular with a proportional to the flow rate characteristic. With the help of the two pressure regulator, a particularly simple and cost-effective pressure control system is formed.

Alternativ kann das Druckregelsystem ein 3/3-Wege-Ventil aufweisen, das an der Eingangsseite mit der Kraftstoffleitung und an der Ausgangsseite jeweils mit der Rücklaufleitung und der Ableitung verbunden ist. In einem ersten Schaltzustand des 3/3-Wege-Ventils sind sowohl die Ableitung als auch die Rücklaufleitung von der Kraftstoffleitung getrennt. In einem zweiten Schaltzustand, in den das das 3/3-Wege-Ventil bei dem ersten Druck schaltet, wird die Ableitung mit der Kraftstoffleitung verbunden, während die Rücklaufleitung geschlossen bleibt. Bei dem zweiten Druck schaltet das 3/3-Wege-Ventil in einen dritten Schaltzustand, bei dem sowohl die Ableitung als auch die Rücklaufleitung mit der Kraftstoffleitung verbunden sind. Falls der erste Druck und der zweite Druck den selben Betrag aufweisen, kann auch ein Ventil mit nur zwei Schaltzuständen, d. h. ein 3/2-Wege-Ventil verwendet werden, bei dem in einem ersten Schaltzustand die Ableitung mit der Rücklaufleitung getrennt sind und in dem zweiten Schaltzustand sowohl die Ableitung als auch die Rücklaufleitung mit der Kraftstoffleitung verbunden sind. Durch das 3/3-Wege-Ventil bzw. 3/2-Wege-Ventil kann das Druckregelsystem sehr kompakt und platzsparend ausgestaltet werden.Alternatively, the pressure control system may include a 3/3-way valve connected to the fuel line at the input side and the return line and the drain at the output side, respectively. In a first switching state of the 3/3-way valve, both the derivative and the return line are separated from the fuel line. In a second Switching state, in which switches the 3/3-way valve at the first pressure, the derivative is connected to the fuel line, while the return line remains closed. In the second pressure, the 3/3-way valve switches to a third switching state, in which both the derivative and the return line are connected to the fuel line. If the first pressure and the second pressure have the same amount, a valve with only two switching states, ie a 3/2-way valve can be used in which the derivative with the return line are separated in a first switching state and in the second switching state, both the derivative and the return line are connected to the fuel line. By the 3/3-way valve or 3/2-way valve, the pressure control system can be made very compact and space-saving.

Zur Detektion des ersten Drucks und des Zweiten Drucks ist das Druckregelsystem vorzugsweise mit einer Druckmesseinrichtung verbunden, durch die das Druckregelsystem gesteuert wird. Insbesondere wird zur Steuerung des Druckregelsystems der Druck der Kraftstoffleitung gemessen, so dass es sich bei dem ersten Druck und dem zweiten Druck um Drücke der Kraftstoffleitung handelt. Die Druckmessung erfolgt vorzugsweise hydraulisch, beispielsweise über ein Druckmesssystem mit einer Prallplatte oder der gleichen.For detecting the first pressure and the second pressure, the pressure control system is preferably connected to a pressure measuring device, by which the pressure control system is controlled. In particular, to control the pressure control system, the pressure of the fuel line is measured, so that the first pressure and the second pressure are pressures of the fuel line. The pressure measurement is preferably carried out hydraulically, for example via a pressure measuring system with a baffle plate or the like.

Besonders bevorzugt weist die Kraftstoffleitung ein Druckhalteventil auf. Das Druckhalteventil ist insbesondere möglichst nah an der Kraftstoffpumpe angeordnet. Vorzugsweise schließt sich das Druckhalteventil direkt an die Kraftstoffpumpe an, so dass das Druckhalteventil zwischen der Kraftstoffpumpe und der Kraftstoffleitung angeordnet ist. Durch das Druckhalteventil wird erreicht, dass nach dem Ausschalten der Brennkraftmaschine ein möglichst großer Teil der Kraftstoffleitung mit Kraftstoff gefüllt ist, der einen Druck von mehr als 1 bar aufweist. Dadurch wird die Kraftstoffleitung nicht nur zum Fördern von Kraftstoff, sondern auch zum Speichern von Kraftstoff verwendet, da der Kraftstoff in der Kraftstoffleitung einen Druck aufweist, der auch ohne ein Fördern der Krafftstoffpumpe zur Versorgung der Brennkraftmaschine ausreicht. Ggf. kann ein weiteres Druckhalteventil, beispielsweise ein Rückhalteventil, vorgesehen sein, um den Bereich der Kraftstoffleitung, der auch nach dem Ausschalten der Brennkraftmaschine unter erhöhtem Druck steht, genau definieren zu können.Particularly preferably, the fuel line to a pressure-holding valve. The pressure-maintaining valve is in particular arranged as close as possible to the fuel pump. Preferably, the pressure-holding valve connects directly to the fuel pump, so that the pressure-holding valve between the fuel pump and the fuel line is arranged. By the pressure-maintaining valve is achieved that after switching off the internal combustion engine as much of the fuel line is filled with fuel having a pressure of more than 1 bar. As a result, the fuel line is used not only for conveying fuel, but also for storing fuel, since the fuel in the fuel line has a pressure that is sufficient even without supplying the Krafftstoffpumpe to supply the internal combustion engine. Possibly. For example, a further pressure-holding valve, for example a retention valve, can be provided in order to be able to precisely define the region of the fuel line which is under increased pressure even after the internal combustion engine has been switched off.

Die Erfindung betrifft ferner ein Verfahren zur Regelung der Kraftstoffversorgung einer Brennkraftmaschine, durch das besonders einfach ein verbessertes Startverhalten einer insbesondere bei einem Kraftfahrzeug angeordneten Brennkraftmaschine erreicht wird. Bei dem erfindungsgemäßen Verfahren wird zunächst die Brennkraftmaschine gestartet. Mit dem Start der Brennkraftmaschine wird die Bennkraftmaschine aus einer Kraftstoff aufweisenden Kraftstoffleitung, die mit einer Kraftstoffpumpe verbunden ist, versorgt. Danach wird mit Hilfe der Kraftstoffpumpe Kraftstoff in die Kraftstoffleitung gefördert. Durch das Fördern der Kraftstoffpumpe steigt der Druck in der Kraftstoffleitung an. Anschließend wird eine zuvor verschlossene Ableitung geöffnet, die mit der Kraftstoffleitung und mindestens einer Saugstrahlpumpe verbunden ist. Das Öffnen der Ableitung erfolgt bei einem ersten Druck, der so gewählt ist, dass die Verbrennungsmaschine sicher startet. Mit steigender Ableitungsmenge steigt der Druck in der Ableitung insbesondere durch den Widerstand der Saugstrahldüse(n), bis der Ableitungsdruck im Wesentlichen gleich dem zweiten Druck ist. Danach wird eine zuvor verschlossene Rückführleitung geöffnet, die mit der Kraftstoffleitung verbunden ist und Kraftstoff zu der Kraftstoffpumpe hin zurückführt. Das Öffnen der Rückführleitung erfolgt bei einem zweiten Druck, welcher erfindungsgemäß der Auslegungsdruck, d. h. der Betriebsdruck, der Verbrennungsmaschine ist. Falls der erste Druck und der zweite Druck identisch ist, erfolgt das Öffnen der Ableitung und der Rückführleitung gleichzeitig. Vorzugsweise ist für die Funktion der Saugstrahlpumpe(n) der erste Druck niedriger als der zweite Druck, so dass die Ableitung vor der Rückführleitung geöffnet wird.The invention further relates to a method for controlling the fuel supply of an internal combustion engine, by the particularly simple improved start-up behavior of a particular arranged in a motor vehicle internal combustion engine is achieved. In the method according to the invention, the internal combustion engine is first started. With the start of the internal combustion engine, the Bennkraftmaschine from a fuel having fuel line, which is connected to a fuel pump, supplied. Thereafter, fuel is fed into the fuel line with the aid of the fuel pump. By conveying the fuel pump, the pressure in the fuel line increases. Subsequently, a previously sealed discharge is opened, which is connected to the fuel line and at least one suction jet pump. The discharge opens at a first pressure selected to safely start the engine. As the discharge quantity increases, the pressure in the discharge increases, in particular, due to the resistance of the suction jet nozzle (s) until the discharge pressure is substantially equal to the second pressure. Thereafter, a previously closed return line is opened, which is connected to the fuel line and returns fuel to the fuel pump out. The opening of the return line takes place at a second pressure, which according to the invention the design pressure, d. H. the operating pressure of the internal combustion engine is. If the first pressure and the second pressure are identical, the discharge and the return line are opened simultaneously. Preferably, for the function of the suction jet pump (s), the first pressure is lower than the second pressure, so that the discharge is opened before the return line.

Zur Verbesserung der Kraftstoffversorgung der Brennkraftmaschine weist die Kraftstoffleitung vorzugsweise beim Starten der Brennkraftmaschine einen Druck von mehr als 1 bar auf. Es wird also vor dem Starten der Brennkraftmaschine in der Kraftstoffleitung ein Druck von mehr als 1 bar bereitgestellt.To improve the fuel supply of the internal combustion engine, the fuel line preferably at start of the internal combustion engine, a pressure of more than 1 bar. Thus, a pressure of more than 1 bar is provided in the fuel line before starting the internal combustion engine.

Um den Betrieb der Brennkraftmaschine zu beenden wird vorzugsweise zunächst die Brennkraftmaschine ausgeschaltet. Da dadurch die elektrische Kraftstoffpumpe nicht mehr mit Strom versorgt wird, fällt der Druck in der Kraftstoffleitung ab. Anschließend wird die Rückführleitung bei dem zweiten Druck geschlossen. Danach wird bei dem ersten Druck die Ableitung geschlossen. Falls der erste Druck und der zweite Druck identisch sein sollten, werden die Rückführleitung und die Ableitung gleichzeitig geschlossen. Nach dem Schließen der Ableitung erfolgt insbesondere der Verfahrensschritt, dass die Kraftstoffleitung mit Hilfe eines Druckhalteventils geschlossen wird. Dadurch bleibt der Druck in der Kraftstoffleitung, der geringfügig niedriger als der erste Druck ist, bestehen. Besonders bevorzugt wird für das erfindungsgemäße Verfahren ein wie vorstehend beschriebenes Kraftstoffversorgungssystem verwendet.To end the operation of the internal combustion engine, the internal combustion engine is preferably first switched off. Since this means that the electric fuel pump is no longer supplied with power, the pressure in the fuel line drops. Subsequently, the return line is closed at the second pressure. Thereafter, the derivative is closed at the first pressure. If the first pressure and the second pressure are identical, the return line and the drain are closed at the same time. After closing the discharge, in particular, the method step is carried out that the fuel line is closed by means of a pressure-holding valve. This will leave the pressure in the fuel line slightly lower than the first pressure. Particularly preferred for the inventive method as described above fuel supply system is used.

Im Folgenden wird die Erfindung unter Bezugnahme auf die anliegenden Zeichnungen anhand bevorzugter Ausführungsformen näher erläutert.

Fig. 1
zeigt ein erfindungsgemäßes Kraftstoffversorgungssystem in einer ersten Ausführungsform.
Fig. 2
zeigt das Kraftstoffversorgungssystem in einer zweiten Ausführungsform und
Fig. 3
zeigt das Kraftstoffversorgungssystem in einer dritten Ausführungsform.
In the following the invention will be explained in more detail with reference to the accompanying drawings with reference to preferred embodiments.
Fig. 1
shows a fuel supply system according to the invention in a first embodiment.
Fig. 2
shows the fuel supply system in a second embodiment and
Fig. 3
shows the fuel supply system in a third embodiment.

In einer ersten Ausführungsform des erfindungsgemäßen Kraftstoffversorgungssystems ist eine elektrische Kraftstoffpumpe 10 innerhalb eines Schwalltopfes 12 in einem Tank 14 angeordnet, wobei der Tank 14 im dargestellten Ausführungsbeispiel ein Satteltank ist. Die Kraftstoffpumpe 10 ist über ein Druckhalteventil 16 mit einer Kraftstoffleitung 18 verbunden, die zu einem Verbrennungsmotor 20 führt. Mit der Kraftstoffleitung 18 ist eine Rückführleitung 22 verbunden, die einen Teil des von der Kraftstoffpumpe 10 geförderten Kraftstoffes in den Schwalltopf 12 zurückführt. Dadurch, dass ein Teil des geförderten Kraftstoffes im Kreis gefördert wird, wird die Kühlung der Kraftstoffpumpe 10 verbessert. Mit der Kraftstoffleitung 18 ist ferner eine Ableitung 24 verbunden, über die ein Teil des geförderten Kraftstoffes zu einer Saugstrahlpumpe 26 gefördert wird. Mit der Saugstrahlpumpe 26 wird durch den geförderten Kraftstoff Kraftstoff aus dem Tank 14 mitgerissen und in den Schwalltopf 12 gefördert. Durch die Saugstrahlpumpe ist sichergestellt, dass für die Kraftstoffpumpe 10 genügend Kraftstoff in dem Schwalltopf 12 vorhanden ist, damit die Kraftstoffpumpe keine Luft fördert.In a first embodiment of the fuel supply system according to the invention, an electric fuel pump 10 is disposed within a baffle 12 in a tank 14, wherein the tank 14 in the illustrated embodiment is a saddle tank. The fuel pump 10 is connected via a pressure-maintaining valve 16 with a fuel line 18, which leads to an internal combustion engine 20. With the fuel line 18, a return line 22 is connected, which returns a portion of the funded by the fuel pump 10 fuel in the swirl pot 12. The fact that a part of the pumped fuel is conveyed in a circle, the cooling of the fuel pump 10 is improved. With the fuel line 18, a discharge line 24 is also connected, via which a part of the pumped fuel is conveyed to a suction jet pump 26. With the suction jet pump 26 fuel is entrained by the pumped fuel from the tank 14 and conveyed into the swirl pot 12. By the suction jet pump ensures that enough fuel in the swirl pot 12 is present for the fuel pump 10, so that the fuel pump does not deliver air.

Die Ableitung 24 kann mit Hilfe eines ersten Druckreglers 28 geöffnet bzw. geschlossen werden. Der erste Druckregler 28 wird bei einem ersten Druck betätigt, wobei bei einem ansteigendem Druck in der Kraftstoffleitung 10 die Verbindung zu der Ableitung 24 geöffnet und bei einem abfallenden Druck in der Kraftstoffleitung 18 geschlossen wird. Entsprechend weist die Rückführleitung 22 einen zweiten Druckregler 30 auf, der die Verbindung zwischen der Rückführleitung 23 und der Kraftstoffleitung 18 bei einem zweiten Druck öffnet bzw. schließt. Bei einem ansteigendem Druck in der Kraftstoffleitung 18 wird die Verbindung der Rückführleitung 22 mit der Kraftstoffleitung 18 geöffnet und bei einem abfallendem Druck in der Kraftstoffleitung 18 geschlossen.The derivative 24 can be opened or closed by means of a first pressure regulator 28. The first pressure regulator 28 is actuated at a first pressure, wherein at a rising pressure in the fuel line 10, the connection to the drain 24 is opened and closed at a decreasing pressure in the fuel line 18. Accordingly, the return line 22 to a second pressure regulator 30 which opens and closes the connection between the return line 23 and the fuel line 18 at a second pressure. At a rising pressure in the fuel line 18, the connection of the return line 22 is opened to the fuel line 18 and closed at a decreasing pressure in the fuel line 18.

Durch die Druckregler 28, 30 wird erreicht, dass beim Starten der Brennkraftmaschine 20, wenn die elektrische Kraftstoffpumpe 10 noch nicht ausreichend mit Strom versorgt wird, die Kraftstoffleitung 18 nur mit der Brennkraftmaschine 20 verbunden ist. Dadurch wird bei einem kompakten Aufbau des erfindungsgemäßen Kraftstoffversorgungssystems der Start des Verbindungsmotors 20 sowie der Start der Kraftstoffpumpe 10 beschleunigt, wodurch die Kraftstoffversorgung der Brennkraftmaschine 20 verbessert wird.By the pressure regulator 28, 30 is achieved that when starting the internal combustion engine 20, when the electric fuel pump 10 is not sufficiently supplied with power, the fuel line 18 is connected only to the internal combustion engine 20. As a result, in a compact design of the fuel supply system according to the invention, the start of the connecting engine 20 and the start of the fuel pump 10 are accelerated, whereby the fuel supply of the internal combustion engine 20 is improved.

In einer zweiten Ausführungsform (Fig. 2) sind die Ableitung 24 und die Rückführleitung 22 über eine gemeinsame Zwischenleitung 32 mit der Kraftstoffleitung 18 verbunden. Die Zwischenleitung 32 führt zu einer Verzweigung 34 in der die Ableitung 24 und die Rückführleitung 22 der Zwischenleitung 32 verbunden sind. In dem dargestellten Ausführungsbeispiel ist im Vergleich zu Fig. 1 der erste Druckregler 28 durch ein erstes Rückschlagventil 36 und der zweite Druckregler 30 durch ein zweites Rückschlagventil 38 ausgebildet. Die Rückschlagventile 36, 38 sind insbesondere derart ausgebildet, dass das Rückschlagventil 36 bei einem niedrigeren Druck öffnet als das zweite Rückschlagventil 38.In a second embodiment (FIG. 2), the discharge line 24 and the return line 22 are connected to the fuel line 18 via a common intermediate line 32. The intermediate line 32 leads to a branch 34 in which the discharge line 24 and the return line 22 of the intermediate line 32 are connected. In the illustrated embodiment, in comparison to FIG. 1, the first pressure regulator 28 is formed by a first check valve 36 and the second pressure regulator 30 by a second check valve 38. The check valves 36, 38 are in particular designed such that the check valve 36 opens at a lower pressure than the second check valve 38th

In einer dritten Ausführungsform des Kraftstoffversorgungssystems (Fig. 3) sind im Vergleich zu dem in Fig. 2 dargestelltem Kraftstoffversorgungssystem die Rückschlagventile 36, 38 sowie die Verzweigung 34 durch ein 3/3-Wege-Ventil 40 ersetzet worden. An einer Eingangsseite 42 des 3/3-Wege-Ventils 40 ist die Zwischenverbindung 32 angeschlossen und an einer Ausgangsseite 44 des 3/3 Wegesystems 40 sind die Ableitung 24 und die Rückführleitung 24 angeschlossen. In einem ersten Schaltzustand 46 sind die Ableitung 24 und die Rückführleitung 22 geschlossen. In einem zweiten Schaltzustand ist die Ableitung 24 geöffnet, d. h. mit der Kraftstoffleitung 18 verbunden, während die Rückführleitung 22 geschlossen ist. In einem dritten Schaltzustand 50 sind sowohl die Ableitung 24 als auch die Rückführleitung 22 geöffnet und mit der Kraftstoffleitung 18 verbunden.In a third embodiment of the fuel supply system (FIG. 3), the check valves 36, 38 and the branch 34 have been replaced by a 3/3-way valve 40 as compared to the fuel supply system illustrated in FIG. At an input side 42 of the 3/3-way valve 40, the intermediate connection 32 is connected and at an output side 44 of the 3/3 way system 40, the derivative 24 and the return line 24 are connected. In a first switching state 46, the discharge line 24 and the return line 22 are closed. In a second switching state, the derivative 24 is opened, d. H. connected to the fuel line 18 while the return line 22 is closed. In a third switching state 50, both the discharge line 24 and the return line 22 are opened and connected to the fuel line 18.

Beim Starten der Brennkraftmaschine 20 werden die einzelnen Schaltzustände 46, 48, 50 beginnend bei dem ersten Schaltzustand 46 durchlaufen, indem bei der in Fig. 3 dargestellten Ausführungsform das 3/3-Wege-Ventil 40 in Richtung des Pfeils 52 verschoben wird. Nach dem Ausschalten der Brennkraftmaschine 42 werden die einzelnen Schaltzustände 46, 48, 50 beginnend beim dritten Schaltzustand 50 durchlaufen, indem das 3/3-Wege-Ventil 40 in Richtung des Pfeils 54 verschoben wird. Zur Steuerung des 3/3-Wege-Ventil 40 ist eine Druckmesseinrichtung 56 vorgesehen, die in Abhängigkeit von dem in der Kraftstoffleitung 18 gemessenem Druck die einzelnen Schaltzustände 46, 48, 50 ansteuert.When starting the internal combustion engine 20, the individual switching states 46, 48, 50, starting at the first switching state 46, are traversed by the 3/3-way valve 40 being displaced in the direction of the arrow 52 in the embodiment shown in FIG. After switching off the internal combustion engine 42, the individual switching states 46, 48, 50, starting at the third switching state 50, are run through by the 3/3-way valve 40 being displaced in the direction of the arrow 54. To control the 3/3-way valve 40 is a Pressure measuring device 56 is provided which, depending on the measured pressure in the fuel line 18, the individual switching states 46, 48, 50 drives.

Das erfindungsgemäße Kraftstoffversorgungssystem weist also ein Druckregelsystem 58 auf, das in der ersten Ausführungsform (Fig. 1) durch die beiden Druckregler 28, 30, einer zweite Ausführungsform (Fig. 3) durch die Verzweigung 34 und die Rückschlagventile 36, 38 und in der dritten Ausführungsform (Fig. 3) durch das 3/3-Wege-Ventil 40 gebildet wird.The fuel supply system according to the invention thus comprises a pressure control system 58, which in the first embodiment (Figure 1) through the two pressure regulators 28, 30, a second embodiment (Figure 3) through the branch 34 and the check valves 36, 38 and in the third Embodiment (Fig. 3) is formed by the 3/3-way valve 40.

Claims (13)

  1. A fuel supply system for supplying an internal combustion engine (20) with fuel, comprising
    an electric fuel pump (10) allocated to a fuel tank (14),
    a fuel line (18) leading to the internal combustion engine (20) and connected with the fuel pump (10),
    a return line (22) connected with the fuel line (18), for returning fuel toward the fuel pump (10),
    a shunt (24) connected with the fuel line (18), for operating a sucking jet pump (26) arranged in the fuel tank (14), and
    a pressure control system (58) opening or closing the connection of the shunt (24) to the fuel line (18) at a first pressure and opening or closing the connection of the return line (22) with the fuel line (18) at a second pressure, the pressure control system (58) opening the shunt (24) and the return line (22) when the pressure increases and closing them when the pressure drops,
    characterized in that
    the second pressure is the operating pressure.
  2. The fuel supply system according to claim 1, characterized in that the pressure control system (58) comprises a first, particularly mechanical pressure controller (28) connected with the shunt (24) and a second, particularly mechanical pressure controller (30) connected with the return line (22).
  3. The fuel supply system according to claim 1 or 2, characterized in that the pressure control system (58) comprises a 3/3-way valve (40) that is connected with the fuel line (18) at the input side (42) and respectively connected with the return line (22) and with the shunt (24) at the output side (44).
  4. The fuel supply system according to one of claims 1 - 3, characterized in that the first pressure is--lower than the second pressure.
  5. The fuel supply system according to one of claims 1-4, characterized in that the pressure control system (58) is connected with a pressure measuring means (56) measuring the pressure of the fuel line (18) in particular for controlling the pressure control system (58).
  6. The fuel supply system according to one of claims 1 - 5, characterized in that the fuel line (18) has a pressure keeping valve (16) which is particularly as close to the fuel pump (10) as possible.
  7. The fuel supply system according to one of claims 1 - 6, characterized in that the fuel pump (10) is arranged in a surge pot (12) into which the shunt (24) and the return line (22) feed.
  8. A method for controlling the fuel supply of an internal combustion engine (20) with the following steps:
    - starting the internal combustion engine (20),
    - supplying the internal combustion engine (20) from a fuel line (18) comprising fuel and being connected with a fuel pump (10),
    - feeding fuel into the fuel line (18) by means of the fuel pump (10),
    - opening a previously closed shunt (24) connected with the fuel line (18) and a sucking jet pump (26) at a first pressure, and
    - opening a previously closed return line (22) connected with the fuel line (18), for returning fuel toward the fuel pump (10) at a second pressure,
    characterized in that
    the second pressure is the operating pressure.
  9. The method according to claim 8, wherein the fuel in the fuel line (18) has a pressure of more than 1 bar when the internal combustion engine (20) is started.
  10. The method according to claim 8 or 9, wherein the first pressure is lower than the second pressure.
  11. The method according to one of claims 8 - 10, wherein the following steps are performed after the return line (22) has been opened:
    - switching off the internal combustion engine (20),
    - closing the return line (22) at the second pressure, and
    - closing the shunt (24) at the first pressure.
  12. The method according to claim 11, wherein the following step is performed after the shunt (24) has been closed:
    - closing the fuel line (18) by means of a pressure keeping valve (16).
  13. The method according to one of claims 8 - 12, wherein a fuel supply system according to one of claims 1 - 7 is used.
EP05002223A 2004-02-18 2005-02-03 Fuel supplying apparatus and method of controlling the supply of fuel Active EP1566536B1 (en)

Applications Claiming Priority (2)

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DE102004007878A DE102004007878A1 (en) 2004-02-18 2004-02-18 Fuel supply system and method for controlling the fuel supply
DE102004007878 2004-02-18

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EP1566536A1 EP1566536A1 (en) 2005-08-24
EP1566536B1 true EP1566536B1 (en) 2007-04-11

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EP (1) EP1566536B1 (en)
DE (2) DE102004007878A1 (en)

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Also Published As

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US7278404B2 (en) 2007-10-09
DE502005000563D1 (en) 2007-05-24
DE102004007878A1 (en) 2005-09-15
EP1566536A1 (en) 2005-08-24
US20050178367A1 (en) 2005-08-18

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