EP2087225A1 - Apparatus for delivering fuel - Google Patents

Apparatus for delivering fuel

Info

Publication number
EP2087225A1
EP2087225A1 EP07821300A EP07821300A EP2087225A1 EP 2087225 A1 EP2087225 A1 EP 2087225A1 EP 07821300 A EP07821300 A EP 07821300A EP 07821300 A EP07821300 A EP 07821300A EP 2087225 A1 EP2087225 A1 EP 2087225A1
Authority
EP
European Patent Office
Prior art keywords
pressure
line
pressure relief
relief valve
filter
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
EP07821300A
Other languages
German (de)
French (fr)
Other versions
EP2087225B1 (en
Inventor
Peter Schelhas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2087225A1 publication Critical patent/EP2087225A1/en
Application granted granted Critical
Publication of EP2087225B1 publication Critical patent/EP2087225B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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 device for conveying fuel according to the preamble of the main claim.
  • the device according to the invention with the characterizing features of the main claim has the advantage that the opening pressure of the pressure relief valve can be below the system pressure built up by the delivery unit by a throttle is provided in the pressure relief line. After switching off the delivery unit, the pressure in the pressure line drops below the system pressure to the opening pressure of the pressure relief valve.
  • This has the advantage that the pressure load on the pressure line is reduced inside and outside of the reservoir, resulting in lower production costs due to the lower pressure requirements.
  • the throttle reduces the amount of leakage flowing through the pressure relief valve, so that the control of the delivery unit is independent of the setting of the pressure relief valve.
  • the drawing shows schematically a erfmdungshiele device for conveying fuel.
  • the device is used for example for conveying fuel. However, it is expressly possible to convey other liquids by means of the device.
  • the device has a delivery unit 1, the fuel sucks at least indirectly from a reservoir 2 and pressure increases via a pressure line 3 to an internal combustion engine 4 promotes.
  • a high-pressure pump 7 is provided in the pressure line 3, which further increases the pressure in the pressure line 3 and directs the fuel into a fuel distributor 5.
  • the fuel distributor 5 is fluidly connected to injection valves 6, which inject the fuel respectively into a combustion chamber, not shown, of the internal combustion engine 4.
  • the delivery unit 1 is arranged for example in the storage container 2 and provided there, for example, within a storage container 9.
  • the example cup-shaped storage container 9 stores enough fuel, so that even when cornering and consequent sloshing of the fuel in the reservoir 2, a fuel supply to the engine 4 is ensured by the delivery unit 1.
  • the delivery unit 1 sucks fuel from the storage tank 9, for example via a pre-filter 10, and promotes this via the pressure line 3 to the internal combustion engine 4.
  • the pre-filter 10 protects the device downstream of the pre-filter 10 from contained in the fuel coarse dirt particles.
  • a check valve 11 is provided so that no fuel from the downstream of the check valve 11 to the upstream of the check valve 11 flows back.
  • a main filler 12 is provided which filters out fine dirt particles from the fuel.
  • Downstream of the pumping unit 1 and upstream of the check valve 11 branches a drive line 13 from the pressure line 3 and leads at least indirectly back into the storage tank 9.
  • the flow of the drive line 13 drives, for example, a so-called suction jet pump 16, the fuel from the reservoir 2 in the storage tank 9 promotes.
  • the suction jet pump 16 is to be designed such that the storage tank 9 remains filled regardless of the level in the reservoir 2 and does not run empty.
  • the suction jet pump 16 has, as is known, a throttle element, for example a nozzle 17, via which the fuel of the drive line 13 passes into a suction chamber 18 which is connected in flow with the storage container 2.
  • the jet emerging from the nozzle 17 into the suction chamber 18 entrains fuel from the suction chamber 18, so that in a known manner the fuel of the propulsion jet and the entrained Kraftsoff via a mixing channel 19 into the storage container 9.
  • the delivery unit 1 is electronically controlled by a control unit 20, which receives from a pressure sensor 21, the actual pressure in the pressure line 3 as a signal.
  • a pressure relief line 22 Downstream of the check valve 11 and, for example, downstream of the main filter 12 branches off a pressure relief line 22 from the pressure line 3, which leads into the reservoir 2 or the storage tank 9 and a pressure relief valve 23 has.
  • the pressure relief valve 23 serves to prevent temperature-induced pressure increases in the pressure line 3 downstream of the check valve 11, which occur for example in Abstellfall or overrun operation of the internal combustion engine 4, since the high temperature of the internal combustion engine 4, the pressure line 3 strongly heated. If the pressure in the pressure relief line 22 thus exceeds a predetermined value, which is referred to below as the opening pressure, the pressure relief valve 23 opens and allows fuel to escape from the pressure line 3, so that the undesired increase in pressure is reduced again.
  • the opening pressure of the pressure relief valve 23 is below the maximum system pressure built up by the delivery unit 1 and in the - A -
  • Pressure relief line 22 a throttle 24 is provided.
  • the throttle reduces the amount of leakage flowing through the pressure relief valve, so that the control of the delivery unit is independent of the setting of the pressure relief valve.
  • a system pressure in the pressure line 3 is constructed by the delivery unit 1, which is for example 6 to 8 bar.
  • the opening pressure of the pressure relief valve 23 is for example between 2 to 4 bar.
  • the pressure relief valve 23 is predominantly open during operation of the delivery unit 1, since the system pressure in the pressure line 3 is above the opening pressure.
  • the pressure relief valve 23 initially remains open until the pressure in the pressure line 3 has fallen downstream of the check valve 11 by the leakage through the throttle 24 below the opening pressure of the pressure relief valve 23.
  • the pressure relief valve 28 opens, for example, at a pressure of about 9 bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Apparatuses for delivering fuel are already known, having a delivery assembly which supplies fuel at increased pressure to an internal combustion engine via a pressure line, wherein a non-return valve and a filter are provided in the pressure line and a pressure relief line having a pressure relief valve branches off from the pressure line downstream of the filter. It is disadvantageous that the opening pressure of the pressure relief valve has to lie above the maximum system pressure which is built up by the delivery assembly, since the delivery assembly could otherwise not build up the electronically regulated system pressure during operation. As a result, the pressure line including the filter is loaded with the high opening pressure over a relatively long time period in the case of being switched off, with the result that the pressure line, in particular the filter, has to be of accordingly pressure-resistant design. The apparatus according to the invention is improved in such a way that the regulation of the delivery assembly is independent of the setting of the pressure relief valve. There is provision according to the invention for the opening pressure of the pressure relief valve (23) to lie below the maximum system pressure which is built up by the delivery assembly (1) and for a restrictor (24) to be provided in the pressure relief line (22).

Description

Beschreibung description
Titeltitle
Vorrichtung zum Fördern von KraftstoffDevice for conveying fuel
Stand der TechnikState of the art
Die Erfindung geht aus von einer Vorrichtung zum Fördern von Kraftstoff nach der Gattung des Hauptanspruchs.The invention relates to a device for conveying fuel according to the preamble of the main claim.
Es ist schon eine Vorrichtung zum Fördern von Kraftstoff aus der DE 102005049982 Al bekannt, mit einem Förderaggregat, das Kraftstoff druckerhöht über eine Druckleitung an eine Brennkraftmaschine liefert, wobei in der Druckleitung ein Rückschlagventil und ein Filter vorgesehen ist und von der Druckleitung stromab des Filters eine Druckentlastungsleitung mit einem Druckentlastungsventil abzweigt. Nachteilig ist, dass der Öffhungsdruck des Druckentlastungsventils über dem vom Förderaggregat aufgebauten maximalen Systemdruck liegen muß, da das Förderaggregat ansonsten im Betrieb den elektronisch geregelten Systemdruck nicht aufbauen könnte. Hierdurch wird die Druckleitung einschließlich des Filters im Abstellfall mit dem hohen Öffnungsdruck über einen längeren Zeitraum druckbelastet, so dass die Druckleitung, insbesondere der Filter, dementsprechend druckfest auszulegen ist.It is already a device for conveying fuel from DE 102005049982 Al known, with a delivery unit, the pressure increases fuel via a pressure line to an internal combustion engine, wherein in the pressure line, a check valve and a filter is provided and from the pressure line downstream of the filter Pressure relief line branches off with a pressure relief valve. The disadvantage is that the Öffhungsdruck the pressure relief valve must be above the built-up of the delivery unit maximum system pressure, since the delivery unit otherwise could not build up the electronically controlled system pressure during operation. As a result, the pressure line including the filter is pressure-loaded in Abstellfall with the high opening pressure over a longer period of time, so that the pressure line, in particular the filter is to be designed accordingly flameproof.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Vorrichtung mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass der Öffnungsdruck des Druckentlastungsventils unter dem vom Förderaggregat aufgebauten Systemdruck liegen kann, indem in der Druckentlastungsleitung eine Drossel vorgesehen ist. Nach dem Abstellen des Förderaggregates sinkt der Druck in der Druckleitung unter den Systemdruck auf den Öffnungsdruck des Druckentlastungsventils ab. Dies hat den Vorteil, dass die Druckbelastung der Druckleitung innerhalb und außerhalb des Vorratsbehälters reduziert wird, so dass sich durch die geringeren Druckanforderungen geringere Herstellungskosten ergeben. Die Drossel verringert die über das Druckbegrenzungsventil abströmende Verlustmenge, so dass die Regelung des Förderaggregates unabhängig von der Einstellung des Druckentlastungsventils ist. Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Vorrichtung möglich.The device according to the invention with the characterizing features of the main claim has the advantage that the opening pressure of the pressure relief valve can be below the system pressure built up by the delivery unit by a throttle is provided in the pressure relief line. After switching off the delivery unit, the pressure in the pressure line drops below the system pressure to the opening pressure of the pressure relief valve. This has the advantage that the pressure load on the pressure line is reduced inside and outside of the reservoir, resulting in lower production costs due to the lower pressure requirements. The throttle reduces the amount of leakage flowing through the pressure relief valve, so that the control of the delivery unit is independent of the setting of the pressure relief valve. The measures listed in the dependent claims advantageous refinements and improvements of the main claim device are possible.
Besonders vorteilhaft ist, wenn die Drossel stromauf des Druckentlastungsventils angeordnet ist, da auf diese Weise die mechanische Belastung des Druckbegrenzungsventils reduziert wird.It is particularly advantageous if the throttle is arranged upstream of the pressure relief valve, since in this way the mechanical load of the pressure relief valve is reduced.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. .An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description. ,
Beschreibung des AusführungsbeispielsDescription of the embodiment
Die Zeichnung zeigt schematisch eine erfmdungsgemäße Vorrichtung zum Fördern von Kraftstoff.The drawing shows schematically a erfmdungsgemäße device for conveying fuel.
Die Vorrichtung dient beispielsweise zum Fördern von Kraftstoff. Es können aber ausdrücklich auch andere Flüssigkeiten mittels der Vorrichtung gefördert werden.The device is used for example for conveying fuel. However, it is expressly possible to convey other liquids by means of the device.
Die Vorrichtung weist ein Förderaggregat 1 auf, das Kraftstoff zumindest mittelbar aus einem Vorratsbehälter 2 ansaugt und druckerhöht über eine Druckleitung 3 zu einer Brennkraftmaschine 4 fördert. Beispielsweise ist in der Druckleitung 3 eine Hochdruckpumpe 7 vorgesehen, die den Druck in der Druckleitung 3 weiter erhöht und den Kraftstoff in einen Kraftstoffverteiler 5 leitet. Der Kraftstoffverteiler 5 ist mit Einspritzventilen 6 strömungsverbunden, die den Kraftstoff jeweils in einen nicht dargestellten Brennraum der Brennkraftmaschine 4 einspritzen.The device has a delivery unit 1, the fuel sucks at least indirectly from a reservoir 2 and pressure increases via a pressure line 3 to an internal combustion engine 4 promotes. For example, a high-pressure pump 7 is provided in the pressure line 3, which further increases the pressure in the pressure line 3 and directs the fuel into a fuel distributor 5. The fuel distributor 5 is fluidly connected to injection valves 6, which inject the fuel respectively into a combustion chamber, not shown, of the internal combustion engine 4.
Das Förderaggregat 1 ist beispielsweise in dem Vorratsbehälter 2 angeordnet und dort beispielsweise innerhalb eines Speicherbehälters 9 vorgesehen. Der beispielsweise topfförmige Speicherbehälter 9 bevorratet ausreichend viel Kraftstoff, damit auch bei einer Kurvenfahrt und den dadurch bedingten Schwappbewegungen des Kraftstoffs im Vorratsbehälter 2 eine Kraftstoffversorgung der Brennkraftmaschine 4 durch das Förderaggregat 1 sichergestellt ist.The delivery unit 1 is arranged for example in the storage container 2 and provided there, for example, within a storage container 9. The example cup-shaped storage container 9 stores enough fuel, so that even when cornering and consequent sloshing of the fuel in the reservoir 2, a fuel supply to the engine 4 is ensured by the delivery unit 1.
Das Förderaggregat 1 saugt Kraftstoff aus dem Speicherbehälter 9 an, beispielsweise über einen Vorfilter 10, und fördert diesen über die Druckleitung 3 zu der Brennkraftmaschine 4. Der Vorfilter 10 schützt die Vorrichtung stromab des Vorfilters 10 vor im Kraftstoff enthaltenen groben Schmutzpartikeln. In der Druckleitung 3 ist beispielsweise ein Rückschlagventil 11 vorgesehen, damit kein Kraftstoff von stromab des Rückschlagventils 11 nach stromauf des Rückschlagventils 11 zurückfliesst. Außerdem ist in der Druckleitung 3 stromab des Rückschlagventils 11 beispielsweise ein Hauptfüter 12 vorgesehen, der feine Schmutzpartikel aus dem Kraftstoff herausfiltert. Stromab des Förderaggregates 1 und stromauf des Rückschlagventils 11 zweigt eine Treib leitung 13 von der Druckleitung 3 ab und führt zumindest mittelbar zurück in den Speicherbehälter 9. Der Volumenstrom der Treib leitung 13 treibt beispielsweise eine sogenannte Saugstrahlpumpe 16 an, die Kraftstoff aus dem Vorratsbehälter 2 in den Speicherbehälter 9 fördert.The delivery unit 1 sucks fuel from the storage tank 9, for example via a pre-filter 10, and promotes this via the pressure line 3 to the internal combustion engine 4. The pre-filter 10 protects the device downstream of the pre-filter 10 from contained in the fuel coarse dirt particles. In the pressure line 3, for example, a check valve 11 is provided so that no fuel from the downstream of the check valve 11 to the upstream of the check valve 11 flows back. In addition, in the pressure line 3 downstream of the check valve 11, for example, a main filler 12 is provided which filters out fine dirt particles from the fuel. Downstream of the pumping unit 1 and upstream of the check valve 11 branches a drive line 13 from the pressure line 3 and leads at least indirectly back into the storage tank 9. The flow of the drive line 13 drives, for example, a so-called suction jet pump 16, the fuel from the reservoir 2 in the storage tank 9 promotes.
Die Saugstrahlpumpe 16 ist derart auszulegen, dass der Speicherbehälter 9 unabhängig vom Füllstand in dem Vorratsbehälter 2 gefüllt bleibt und nicht leer läuft. Die Saugstrahlpumpe 16 weist bekannterweise ein Drosselelement auf, beispielsweise eine Düse 17, über das der Kraftstoff der Treibleitung 13 in einen mit dem Vorratsbehälter 2 strömungsverbundenen Saugraum 18 gelangt. Der aus der Düse 17 in den Saugraum 18 austretende Treibstrahl reißt Kraftstoff aus dem Saugraum 18 mit, so dass auf bekannte Art und Weise der Kraftstoff des Treibstrahls und der mitgerissene Kraftsoff über einen Mischkanal 19 in den Speicherbehälter 9 gelangen.The suction jet pump 16 is to be designed such that the storage tank 9 remains filled regardless of the level in the reservoir 2 and does not run empty. The suction jet pump 16 has, as is known, a throttle element, for example a nozzle 17, via which the fuel of the drive line 13 passes into a suction chamber 18 which is connected in flow with the storage container 2. The jet emerging from the nozzle 17 into the suction chamber 18 entrains fuel from the suction chamber 18, so that in a known manner the fuel of the propulsion jet and the entrained Kraftsoff via a mixing channel 19 into the storage container 9.
Das Förderaggregat 1 wird von einem Steuergerät 20 elektronisch geregelt, das von einem Drucksensor 21 den Istdruck in der Druckleitung 3 als Signal erhält.The delivery unit 1 is electronically controlled by a control unit 20, which receives from a pressure sensor 21, the actual pressure in the pressure line 3 as a signal.
Stromab des Rückschlagventils 11 und beispielsweise stromab des Hauptfilters 12 zweigt eine Druckentlastungsleitung 22 von der Druckleitung 3 ab, die in den Vorratsbehälter 2 oder den Speicherbehälter 9 führt und ein Druckentlastungsventil 23 aufweist.Downstream of the check valve 11 and, for example, downstream of the main filter 12 branches off a pressure relief line 22 from the pressure line 3, which leads into the reservoir 2 or the storage tank 9 and a pressure relief valve 23 has.
Das Druckentlastungsventil 23 dient dazu, temperaturbedingte Druckanstiege in der Druckleitung 3 stromab des Rückschlagventils 11 zu verhindern, die beispielsweise im Abstellfall oder im Schubbetrieb der Brennkraftmaschine 4 auftreten, da die hohe Temperatur der Brennkraftmaschine 4 die Druckleitung 3 stark erwärmt. Übersteigt der Druck in der Druckentlastungsleitung 22 also einen vorbestimmten Wert, der im folgenden als Öffnungsdruck bezeichnet wird, so öffnet das Druckentlastungsventil 23 und lässt Kraftstoff aus der Druckleitung 3 entweichen, so dass der ungewünschte Druckanstieg wieder abgebaut wird.The pressure relief valve 23 serves to prevent temperature-induced pressure increases in the pressure line 3 downstream of the check valve 11, which occur for example in Abstellfall or overrun operation of the internal combustion engine 4, since the high temperature of the internal combustion engine 4, the pressure line 3 strongly heated. If the pressure in the pressure relief line 22 thus exceeds a predetermined value, which is referred to below as the opening pressure, the pressure relief valve 23 opens and allows fuel to escape from the pressure line 3, so that the undesired increase in pressure is reduced again.
Erfindungsgemäß ist vorgesehen, dass der Öffnungsdruck des Druckentlastungsventils 23 unter dem vom Förderaggregat 1 aufgebauten maximalen Systemdruck liegt und in der - A -According to the invention, it is provided that the opening pressure of the pressure relief valve 23 is below the maximum system pressure built up by the delivery unit 1 and in the - A -
Druckentlastungsleitung 22 eine Drossel 24 vorgesehen ist. Die Drossel verringert die über das Druckbegrenzungsventil abströmende Verlustmenge, so dass die Regelung des Förderaggregates unabhängig von der Einstellung des Druckentlastungsventils ist.Pressure relief line 22, a throttle 24 is provided. The throttle reduces the amount of leakage flowing through the pressure relief valve, so that the control of the delivery unit is independent of the setting of the pressure relief valve.
Im Betrieb des Förderaggregates 1 wird vom Förderaggregat 1 ein Systemdruck in der Druckleitung 3 aufgebaut, der beispielsweise 6 bis 8 bar beträgt. Der Öffnungsdruck des Druckentlastungsventils 23 liegt beispielsweise zwischen 2 bis 4 bar. Durch die erfindungsgemäße Ausführung ist das Druckentlastungsventil 23 im Betrieb des Förderaggregates 1 überwiegend geöffnet, da der Systemdruck in der Druckleitung 3 oberhalb des Öffnungsdruckes liegt. Dadurch kommt es zu einer Leckage aus der Druckleitung 3 stromab des Rückschlagventils 11, die jedoch die elektronische Regelung des Förderaggregates 1 nicht wesentlich beeinflusst, da der über die Drossel 24 abströmende Verluststrom sehr gering gehalten ist. Beispielsweise beträgt Leckagestrom etwa 5 Liter pro Stunde.In operation of the delivery unit 1, a system pressure in the pressure line 3 is constructed by the delivery unit 1, which is for example 6 to 8 bar. The opening pressure of the pressure relief valve 23 is for example between 2 to 4 bar. As a result of the embodiment according to the invention, the pressure relief valve 23 is predominantly open during operation of the delivery unit 1, since the system pressure in the pressure line 3 is above the opening pressure. As a result, there is a leakage from the pressure line 3 downstream of the check valve 11, which, however, the electronic control of the delivery unit 1 is not significantly affected, since the effluent via the throttle 24 leakage current is kept very low. For example, leakage current is about 5 liters per hour.
Nach dem Abstellen des Förderaggregates 1 bleibt das Druckentlastungsventil 23 zunächst geöffnet, bis der Druck in der Druckleitung 3 stromab des Rückschlagventils 11 durch die Leckage über die Drossel 24 unter den Öffnungsdruck des Druckentlastungsventils 23 gesunken ist.After switching off the delivery unit 1, the pressure relief valve 23 initially remains open until the pressure in the pressure line 3 has fallen downstream of the check valve 11 by the leakage through the throttle 24 below the opening pressure of the pressure relief valve 23.
Für fehlerhafte Betriebszustände des Systems zweigt von der Druckleitung 3 stromab desFor faulty operating conditions of the system branches from the pressure line 3 downstream of the
Förderaggregates 1 und stromauf des Rückschlagventils 11 eine Druckbegrenzungsleitung 27 mit einem Druckbegrenzungsventil 28 ab, um Drücke in der Druckleitung 3 zu verhindern, die die beschriebene Vorrichtung beschädigen würden. Das Druckbegrenzungsventil 28 öffnet beispielsweise bei einem Druck von etwa 9 bar. Delivery unit 1 and upstream of the check valve 11 from a pressure relief line 27 with a pressure relief valve 28 from to prevent pressures in the pressure line 3, which would damage the device described. The pressure relief valve 28 opens, for example, at a pressure of about 9 bar.

Claims

Ansprüche claims
1. Vorrichtung zum Fördern von Kraftstoff mit einem Förderaggregat, das Kraftstoff druckerhöht über eine Druckleitung an eine Brennkraftmaschine liefert, wobei in der Druckleitung ein Rückschlagventil und ein Filter vorgesehen ist und von der Druckleitung stromab des Filters eine Druckentlastungsleitung mit einem Druckentlastungsventil abzweigt, dadurch gekennzeichnet, dass der Öffnungsdruck des Druckentlastungsventils (23) unter dem vom Förderaggregat (1) aufgebauten maximalen Systemdruck liegt und in der Druckentlastungsleitung (22) eine Drossel (24) vorgesehen ist.1. A device for conveying fuel with a delivery unit, the fuel pressure increases via a pressure line to an internal combustion engine, wherein in the pressure line, a check valve and a filter is provided and branches off from the pressure line downstream of the filter, a pressure relief line with a pressure relief valve, characterized in that the opening pressure of the pressure relief valve (23) is below the maximum system pressure built up by the delivery unit (1), and a throttle (24) is provided in the pressure relief line (22).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Drossel (24) stromauf des Druckentlastungsventils (23) angeordnet ist.2. Apparatus according to claim 1, characterized in that the throttle (24) upstream of the pressure relief valve (23) is arranged.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass von der Druckleitung (3) stromauf des Rückschlagventils (11) eine Druckbegrenzungsleitung (27) mit einem Druckbegrenzungsventil (28) abzweigt, das den Druck in der Druckleitung (3) auf einen Maximaldruck begrenzt, der oberhalb des Systemdrucks liegt. 3. A device according to claim 1, characterized in that from the pressure line (3) upstream of the check valve (11) branches off a pressure limiting line (27) with a pressure limiting valve (28) which limits the pressure in the pressure line (3) to a maximum pressure, which is above the system pressure.
EP07821300.6A 2006-11-02 2007-10-15 Apparatus for delivering fuel Expired - Fee Related EP2087225B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610051590 DE102006051590A1 (en) 2006-11-02 2006-11-02 Device for conveying fuel
PCT/EP2007/060933 WO2008052873A1 (en) 2006-11-02 2007-10-15 Apparatus for delivering fuel

Publications (2)

Publication Number Publication Date
EP2087225A1 true EP2087225A1 (en) 2009-08-12
EP2087225B1 EP2087225B1 (en) 2017-08-02

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Application Number Title Priority Date Filing Date
EP07821300.6A Expired - Fee Related EP2087225B1 (en) 2006-11-02 2007-10-15 Apparatus for delivering fuel

Country Status (3)

Country Link
EP (1) EP2087225B1 (en)
DE (1) DE102006051590A1 (en)
WO (1) WO2008052873A1 (en)

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EP2087225B1 (en) 2017-08-02
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