EP3353410B1 - Pressure pulsation damper for a fuel injection system, and fuel injection system - Google Patents

Pressure pulsation damper for a fuel injection system, and fuel injection system Download PDF

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Publication number
EP3353410B1
EP3353410B1 EP16741959.7A EP16741959A EP3353410B1 EP 3353410 B1 EP3353410 B1 EP 3353410B1 EP 16741959 A EP16741959 A EP 16741959A EP 3353410 B1 EP3353410 B1 EP 3353410B1
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EP
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Prior art keywords
pressure
fuel
injection system
pulsation damper
fuel injection
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EP16741959.7A
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German (de)
French (fr)
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EP3353410A1 (en
Inventor
Guenter Korponai
Markus Majer
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations

Definitions

  • the invention relates to a pressure pulsation damper for a fuel injection system, in particular a common rail injection system, with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injection system, in particular a common rail injection system, with such a pressure pulsation damper.
  • strong pressure pulsations can occur, which can be associated with high pressure spikes. These are primarily due to the lifting movement of a pump piston of a high-pressure pump of the fuel injection system, in particular if during the delivery of the pump piston one of the filling of the high-pressure pump with fuel serving suction valve remains open at least temporarily to push an excess amount of fuel back into the inlet area.
  • Pressure pulsations can mechanically load a fuel injection system or components or lines arranged therein to such an extent that they are damaged. Furthermore, they can affect the functionality of individual components. For example, a pressure and / or quantity wave can cause a fuel filter arranged in the fuel system to be backwashed. As a result, the filter effect of the fuel filter can be impaired.
  • Fuel injection systems are known from the prior art, which use an overflow valve for damping pressure pulsations.
  • the Abgresmenge is doing fed to a return.
  • the pressure upstream of the spill valve reduces, which may affect the filling of the high pressure pump. Inadequate filling, however, decreases the efficiency of the high-pressure pump.
  • a fuel injection system that includes a high pressure source and at least one fuel injector connected to the high pressure source via a fuel pressure line.
  • a pressure vibration damper is arranged in the fuel pressure line. This has a tubular conduit section with at least one radially extending throttle bore, via which fuel can be discharged into a pressure damping chamber.
  • the publication DE 10 2013 218 878 A1 shows a pressure damper in the form of a container, for example a cylindrical container. Furthermore, the pressure damper has a fluid inlet and a drain pipe, wherein the fluid inlet extends into a fluid space adjoining below a gas space.
  • the drain pipe opens into a transverse wall forming the bottom of the pressure damper.
  • the publication JP2000213434 shows a pressure damper wherein the pressure damper is cylindrical and contains a gas-filled ring member.
  • the present invention has the object to provide a pressure pulsation damper for a fuel injection system, which is simple and inexpensive to produce and also easy to integrate into a fuel injection system.
  • the integration should in particular in the low pressure region of the fuel injection system, preferably in the inlet region of a high-pressure pump, take place to dampen pressure pulsations occurring there, so that the filling of the high-pressure pump is improved.
  • a fuel injection system is also to be provided, which has an increased robustness due to a reduced mechanical load.
  • the pressure pulsation damper is proposed with the features of claim 1. Advantageous developments of the invention can be found in the dependent claims. In addition, a fuel injection system is specified with such a pressure pulsation damper.
  • pressure pulsation damper comprises a tubular conduit portion in which a fuel passage is formed, which is connected via at least one shell-side opening in the tubular conduit portion with a pressure damping chamber.
  • the tubular passage portion forming a fuel passage facilitates integration of the pressure pulsation damper into a fuel injection system.
  • both ends of the pipe-shaped pipe portion may be connected to a fuel pipe so that the pipe-shaped pipe portion forms or replaces a part of the fuel pipe.
  • pressure pulsations occur in the fuel line, they spread into the fuel channel and from there to the pressure damping chamber of the pressure pulsation damper. There, the pressure peaks associated with the pressure pulsations cause a compression of the existing gas volume in the pressure damping chamber, so that the pressure peaks are damped or compensated. A further spread of the pressure pulsations is therefore suppressed.
  • the gas present in the pressure damping chamber absorbs energy. If the pressure in the system subsequently drops again, for example in the suction phase of a high-pressure pump of the fuel injection system, the energy absorbed by the gas is returned to the fuel. This process helps to fill the high-pressure pump so that the efficiency of the high-pressure pump is increased.
  • the gas volume present in the pressure damper space of the proposed pressure pulsation damper is self-contained Distributed gas volumes.
  • the many self-contained gas volumes can also all be the same or different.
  • this may be connected to the fuel-carrying area or sealed off from the fuel.
  • the pressure damping chamber is annular and surrounds the tubular conduit section.
  • the annular design has the advantage that the connection of the pressure damping chamber with the fuel channel in the interior of the tubular conduit section over several, preferably at the same angular distance from each other arranged shell-side openings can be made.
  • the annular design of the pressure damping chamber requires a small space requirement, this is especially true when multiple annular Druckpulsationsdämpfer be switched one behind the other, to a sufficiently large volume of gas for Druckpulsationsdämpfung to accomplish.
  • a plurality of spherical gas-filled elements are received in an annular arrangement.
  • the tubular conduit section forms or comprises at least one end of a connection piece via which the pressure pulsation damper can be connected to a fuel line and / or to a housing part of a component of the fuel injection system.
  • the component may in particular be a fuel pump, preferably a radial piston pump, which preferably has a corresponding recess in a housing part for receiving the connecting piece.
  • the spigot provided at at least one end of the tubular conduit section facilitates integration of the pressure pulsation damper into a fuel injection system.
  • the further proposed fuel injection system in particular common-rail injection system, is characterized in that it comprises a pressure pulsation damper according to the invention.
  • the pressure pulsation damper is arranged in a low-pressure region of the system, in particular in the inlet region of a fuel pump.
  • the advantages of a Druckpulsationsdämpfers invention particularly well come into play, since in the low pressure region, especially in the inlet region of a fuel pump particularly frequently pressure pulsations occur that can burden the system and affect the function of individual system components.
  • the pressure pulsation damper according to the invention is arranged in the inlet region of a fuel pump, it is at the same time possible to ensure sufficient filling of the pump with fuel via the pressure pulsation damper. This is especially true when the fuel pump is a radial piston pump.
  • the fuel pump of the proposed fuel injection system is preferably a radial piston pump.
  • total gas volume is much greater than the displacement volume of the stroke movable pump piston of the radial piston pump selected.
  • the total gas volume is many times greater than the displacement volume of the pump piston.
  • the Indian Fig. 1 illustrated pressure pulsation damper 1 comprises a tubular conduit section 2 to which a cylindrical pressure damping chamber 5 is attached in a peripheral region.
  • the pressure damping chamber 5 is connected via a tubular extension 14 and a shell-side opening 4 formed in the tubular conduit section 2 to a fuel channel 3 of the tubular conduit section 2, so that fuel passes from the fuel channel 3 into the pressure damping chamber 5.
  • the pressure damping chamber 5 is only partially filled with fuel 12, since another part of the pressure damping chamber 5 is filled with a gas 6.
  • the gas 6 is air, which forms a compressible gas volume in the pressure damping chamber 5.
  • a certain separation between the fuel 12 and the gas 6 is effected via a piston-shaped float 8, which floats on the fuel and rises at a pressure and / or quantity wave flowing through the fuel channel 3 with the fuel level in the pressure damping chamber 5 and thereby the gas volume above reduced. In this way, an attenuation of the pressure and / or mass waves is effected.
  • the floating seat of the float 8 in the pressure damping chamber 5 is ensured by a radial gap 13.
  • FIG. 2 Another example of a Druckpulsationsdämpfers is in the Fig. 2 shown. This differs from that of the Fig. 1 in particular in that the gas volume is distributed over many elements formed as hollow spheres 7, which are filled with the gas 6. On the outside, the elements 7 are surrounded by the fuel 12.
  • the gas-filled elements 7 are formed of a material which is elastically deformable. Under pressure, the elements deform 7, wherein the gas 6 is compressed. At the same time, the elements 7 move relative to each other, creating new gusset spaces in which pressure and / or bulk waves can pass.
  • the pressure pulsation damper 1 thus has different modes of action that are used simultaneously and thus make the pulsation damping even more effective.
  • the pressure pulsation damper 1 of Fig. 2 also has a tubular conduit portion 2, which forms at its two ends in each case a connecting piece 9, 10, via which the pressure pulsation damper 1 (not shown) or to a housing part 11 of a fuel pump (not shown) can be connected.
  • a corresponding recess 15 is provided for this purpose, in which the connecting piece 10 can be inserted or pressed.
  • the press fit also ensures a fluid-tight connection.
  • the pressure pulsation damper 1 shown there may also have a connection piece 9, 10 at at least one end.
  • FIGS. 3 and 4 out An embodiment of the invention is based on FIGS. 3 and 4 out.
  • the pressure damping chamber 5 is annular and arranged around the tubular conduit section 2.
  • a plurality of shell-side openings 4 connect the fuel channel 3 formed in the interior of the tubular conduit section 2 to the annular pressure-damping chamber 5 in which a plurality of spherical gas-filled elements 7 are received in an annular arrangement (see Fig. 4 ).
  • the elements 7 are surrounded on the outside by fuel 12, so that occurring in the fuel 12 Pressure and / or mass waves are attenuated by an elastic deformation of the elements 7.

Description

Die Erfindung betrifft einen Druckpulsationsdämpfer für ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem, mit den Merkmalen des Oberbegriffs des Anspruchs 1. Ferner betrifft die Erfindung ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem, mit einem solchen Druckpulsationsdämpfer.The invention relates to a pressure pulsation damper for a fuel injection system, in particular a common rail injection system, with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injection system, in particular a common rail injection system, with such a pressure pulsation damper.

Stand der TechnikState of the art

Innerhalb eines Kraftstoffeinspritzsystems kann es zu starken Druckpulsationen kommen, die mit hohen Druckspitzen einhergehen können. Diese sind vorrangig auf die Hubbewegung eines Pumpenkolbens einer Hochdruckpumpe des Kraftstoffeinspritzsystems zurückzuführen, insbesondere, wenn während des Förderhubs des Pumpenkolbens ein der Befüllung der Hochdruckpumpe mit Kraftstoff dienendes Saugventil zumindest zeitweise geöffnet bleibt, um eine überschüssige Menge Kraftstoff zurück in den Zulaufbereich zu schieben.Within a fuel injection system, strong pressure pulsations can occur, which can be associated with high pressure spikes. These are primarily due to the lifting movement of a pump piston of a high-pressure pump of the fuel injection system, in particular if during the delivery of the pump piston one of the filling of the high-pressure pump with fuel serving suction valve remains open at least temporarily to push an excess amount of fuel back into the inlet area.

Druckpulsationen können ein Kraftstoffeinspritzsystem bzw. hierin angeordnete Komponenten oder Leitungen so stark mechanisch belasten, dass sie Schaden nehmen. Ferner können sie die Funktionsfähigkeit einzelner Komponenten beeinträchtigen. Beispielsweise kann eine Druck- und/oder Mengenwelle dazu führen, dass ein im Kraftstoffsystem angeordneter Kraftstofffilter rückgespült wird. Hierdurch kann die Filterwirkung des Kraftstofffilters beeinträchtigt werden.Pressure pulsations can mechanically load a fuel injection system or components or lines arranged therein to such an extent that they are damaged. Furthermore, they can affect the functionality of individual components. For example, a pressure and / or quantity wave can cause a fuel filter arranged in the fuel system to be backwashed. As a result, the filter effect of the fuel filter can be impaired.

Aus dem Stand der Technik sind Kraftstoffeinspritzsysteme bekannt, die zur Dämpfung von Druckpulsationen ein Überströmventil einsetzen. Die Absteuermenge wird dabei einem Rücklauf zugeführt. In der Folge reduziert sich der Druck stromaufwärts des Überströmventils, was Auswirkungen auf die Befüllung der Hochdruckpumpe haben kann. Bei unzureichender Befüllung sinkt jedoch der Wirkungsgrad der Hochdruckpumpe.Fuel injection systems are known from the prior art, which use an overflow valve for damping pressure pulsations. The Absteuermenge is doing fed to a return. As a result, the pressure upstream of the spill valve reduces, which may affect the filling of the high pressure pump. Inadequate filling, however, decreases the efficiency of the high-pressure pump.

Aus der Offenlegungsschrift DE 10 2006 037 179 A1 ist ein Kraftstoffeinspritzsystem bekannt, das eine Hochdruckquelle und wenigstens einen mit der Hochdruckquelle über eine Kraftstoffdruckleitung verbundenen Kraftstoffinjektor umfasst. In der Kraftstoffdruckleitung ist ein Druckschwingungsdämpfer angeordnet. Dieser weist einen rohrförmigen Leitungsabschnitt mit wenigstens einer radial verlaufenden Drosselbohrung auf, über welche Kraftstoff in einen Druckdämpfungsraum ableitbar ist.From the publication DE 10 2006 037 179 A1 For example, a fuel injection system is known that includes a high pressure source and at least one fuel injector connected to the high pressure source via a fuel pressure line. In the fuel pressure line, a pressure vibration damper is arranged. This has a tubular conduit section with at least one radially extending throttle bore, via which fuel can be discharged into a pressure damping chamber.

Die Offenlegungsschrift DE 10 2013 218 878 A1 zeigt einen Druckdämpfer in Form eines Behälters, beispielsweise eines zylinderförmigen Behälters. Ferner weist der Druckdämpfer einen Fluidzulauf und ein Abflussrohr auf, wobei der Fluidzulauf bis in einen unterhalb eines Gasraums sich anschließenden Fluidraums reicht. Das Abflussrohr mündet in einer den Boden des Druckdämpfers bildende Querwand.The publication DE 10 2013 218 878 A1 shows a pressure damper in the form of a container, for example a cylindrical container. Furthermore, the pressure damper has a fluid inlet and a drain pipe, wherein the fluid inlet extends into a fluid space adjoining below a gas space. The drain pipe opens into a transverse wall forming the bottom of the pressure damper.

Die Offenlegungsschrift JP2000213434 zeigt einen Druckdämpfer wobei der Druckdämpfer zylinderförmig ausgebildet ist und ein gasgefülltes Ringelement enthält.The publication JP2000213434 shows a pressure damper wherein the pressure damper is cylindrical and contains a gas-filled ring member.

Ausgehend von dem vorstehend genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen Druckpulsationsdämpfer für ein Kraftstoffeinspritzsystem anzugeben, der einfach und kostengünstig herstellbar und zudem leicht in ein Kraftstoffeinspritzsystem zu integrieren ist. Die Integration soll insbesondere im Niederdruckbereich des Kraftstoffeinspritzsystems, vorzugsweise im Zulaufbereich einer Hochdruckpumpe, erfolgen, um dort auftretende Druckpulsationen zu dämpfen, so dass die Befüllung der Hochdruckpumpe verbessert wird. Auf diese Weise soll ferner ein Kraftstoffeinspritzsystem geschaffen werden, das eine erhöhte Robustheit aufgrund einer verringerten mechanischen Belastung besitzt.Based on the above-mentioned prior art, the present invention has the object to provide a pressure pulsation damper for a fuel injection system, which is simple and inexpensive to produce and also easy to integrate into a fuel injection system. The integration should in particular in the low pressure region of the fuel injection system, preferably in the inlet region of a high-pressure pump, take place to dampen pressure pulsations occurring there, so that the filling of the high-pressure pump is improved. In this way, a fuel injection system is also to be provided, which has an increased robustness due to a reduced mechanical load.

Zur Lösung der Aufgabe wird der Druckpulsationsdämpfer mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen. Darüber hinaus wird ein Kraftstoffeinspritzsystem mit einem solchen Druckpulsationsdämpfer angegeben.To solve the problem, the pressure pulsation damper is proposed with the features of claim 1. Advantageous developments of the invention can be found in the dependent claims. In addition, a fuel injection system is specified with such a pressure pulsation damper.

Offenbarung der ErfindungDisclosure of the invention

Der für ein Kraftstoffeinspritzsystem, insbesondere ein Common-Rail-Einspritzsystem, vorgeschlagene Druckpulsationsdämpfer umfasst einen rohrförmigen Leitungsabschnitt, in dem ein Kraftstoffkanal ausgebildet ist, der über mindestens eine mantelseitige Öffnung im rohrförmigen Leitungsabschnitt mit einem Druckdämpfungsraum verbunden ist.The proposed for a fuel injection system, in particular a common rail injection system, pressure pulsation damper comprises a tubular conduit portion in which a fuel passage is formed, which is connected via at least one shell-side opening in the tubular conduit portion with a pressure damping chamber.

Der einen Kraftstoffkanal ausbildende rohrförmige Leitungsabschnitt erleichtert die Integration des Druckpulsationsdämpfers in ein Kraftstoffeinspritzsystem. Beispielsweise können beide Enden des rohrförmigen Leitungsabschnitts mit einer Kraftstoffleitung verbunden werden, so dass der rohrförmige Leitungsabschnitt einen Teil der Kraftstoffleitung ausbildet oder ersetzt. Treten in der Kraftstoffleitung Druckpulsationen auf, breiten sich diese bis in den Kraftstoffkanal und von dort bis in den Druckdämpfungsraum des Druckpulsationsdämpfers aus. Dort bewirken die mit den Druckpulsationen einhergehenden Druckspitzen eine Komprimierung des im Druckdämpfungsraum vorhandenen Gasvolumens, so dass die Druckspitzen gedämpft bzw. kompensiert werden. Eine weitere Ausbreitung der Druckpulsationen wird demnach unterbunden. Insbesondere stromaufwärts des Druckpulsationsdämpfers angeordnete Komponenten und/oder Leitungen des Kraftstoffeinspritzsystems werden auf diese Weise deutlich weniger mechanisch belastet, so dass die Robustheit des Systems steigt. Ferner wird ein unerwünschtes Rückspülen eines stromaufwärts des Druckpulsationsdämpfers angeordneten Kraftstofffilters verhindert, so dass eine optimale Filterwirkung gesichert ist.The tubular passage portion forming a fuel passage facilitates integration of the pressure pulsation damper into a fuel injection system. For example, both ends of the pipe-shaped pipe portion may be connected to a fuel pipe so that the pipe-shaped pipe portion forms or replaces a part of the fuel pipe. If pressure pulsations occur in the fuel line, they spread into the fuel channel and from there to the pressure damping chamber of the pressure pulsation damper. There, the pressure peaks associated with the pressure pulsations cause a compression of the existing gas volume in the pressure damping chamber, so that the pressure peaks are damped or compensated. A further spread of the pressure pulsations is therefore suppressed. In particular, arranged upstream of the Druckpulsationsdämpfers components and / or lines of the fuel injection system are significantly less mechanically loaded in this way, so that the robustness of the system increases. Furthermore, an undesired backwashing of a fuel filter arranged upstream of the pressure pulsation damper is prevented, so that an optimal filter effect is ensured.

Bei der Komprimierung nimmt das im Druckdämpfungsraum vorhandene Gas Energie auf. Fällt anschließend der Druck im System wieder ab, beispielsweise in der Saugphase einer Hochdruckpumpe des Kraftstoffeinspritzsystems, wird die vom Gas aufgenommene Energie wieder an den Kraftstoff abgegeben. Dieser Vorgang wirkt unterstützend bei der Befüllung der Hochdruckpumpe, so dass der Wirkungsgrad der Hochdruckpumpe gesteigert wird.During compression, the gas present in the pressure damping chamber absorbs energy. If the pressure in the system subsequently drops again, for example in the suction phase of a high-pressure pump of the fuel injection system, the energy absorbed by the gas is returned to the fuel. This process helps to fill the high-pressure pump so that the efficiency of the high-pressure pump is increased.

Das im Druckdämpferraum des vorgeschlagenen Druckpulsationsdämpfers vorhandene Gasvolumen ist auf viele in sich geschlossene Gasvolumina verteilt. Die vielen in sich geschlossenen Gasvolumina können zudem alle gleichartig oder unterschiedlich ausgebildet sein.The gas volume present in the pressure damper space of the proposed pressure pulsation damper is self-contained Distributed gas volumes. The many self-contained gas volumes can also all be the same or different.

Soweit ein zusammenhängendes Gasvolumen im Druckdämpfungsraum vorgesehen ist, kann dieses mit dem Kraftstoff führenden Bereich verbunden oder gegenüber dem Kraftstoff abgedichtet sein.As far as a contiguous volume of gas is provided in the pressure damping chamber, this may be connected to the fuel-carrying area or sealed off from the fuel.

Erfindungsgemäß ist der Druckdämpfungsraum ringförmig ausgebildet und umgibt den rohrförmigen Leitungsabschnitt. Die ringförmige Ausbildung besitzt den Vorteil, dass die Verbindung des Druckdämpfungsraums mit dem Kraftstoffkanal im Inneren des rohrförmigen Leitungsabschnitts über mehrere, vorzugsweise im gleichen Winkelabstand zueinander angeordnete mantelseitige Öffnungen hergestellt werden kann. Zudem erfordert die ringförmige Ausführung des Druckdämpfungsraums einen geringen Bauraumbedarf, dies gilt insbesondere, wenn mehrere ringförmige Druckpulsationsdämpfer hinter einander geschaltet werden, um ein ausreichend großes Gasvolumen zur Druckpulsationsdämpfung zu schaffen. In dem Druckdämpfungsraum sind in ringförmiger Anordnung mehrere kugelförmige gasgefüllte Elemente aufgenommen.According to the invention, the pressure damping chamber is annular and surrounds the tubular conduit section. The annular design has the advantage that the connection of the pressure damping chamber with the fuel channel in the interior of the tubular conduit section over several, preferably at the same angular distance from each other arranged shell-side openings can be made. In addition, the annular design of the pressure damping chamber requires a small space requirement, this is especially true when multiple annular Druckpulsationsdämpfer be switched one behind the other, to a sufficiently large volume of gas for Druckpulsationsdämpfung to accomplish. In the pressure damping chamber a plurality of spherical gas-filled elements are received in an annular arrangement.

Als weiterbildende Maßnahme wird vorgeschlagen, dass der rohrförmige Leitungsabschnitt an mindestens einem Ende einen Anschlussstutzen ausbildet oder umfasst, über den der Druckpulsationsdämpfer mit einer Kraftstoffleitung und/oder mit einem Gehäuseteil einer Komponente des Kraftstoffeinspritzsystems verbindbar ist. Bei der Komponente kann es sich insbesondere um eine Kraftstoffpumpe, vorzugsweise eine Radialkolbenpumpe, handeln, die zur Aufnahme des Anschlussstutzens bevorzugt eine entsprechende Ausnehmung in einem Gehäuseteil besitzt. Der an mindestens einem Ende des rohrförmigen Leitungsabschnitts vorgesehene Anschlussstutzen vereinfacht die Integration des Druckpulsationsdämpfers in ein Kraftstoffeinspritzsystem.As a further development measure, it is proposed that the tubular conduit section forms or comprises at least one end of a connection piece via which the pressure pulsation damper can be connected to a fuel line and / or to a housing part of a component of the fuel injection system. The component may in particular be a fuel pump, preferably a radial piston pump, which preferably has a corresponding recess in a housing part for receiving the connecting piece. The spigot provided at at least one end of the tubular conduit section facilitates integration of the pressure pulsation damper into a fuel injection system.

Das ferner vorgeschlagene Kraftstoffeinspritzsystem, insbesondere Common-Rail-Einspritzsystem, zeichnet sich dadurch aus, dass es einen erfindungsgemäßen Druckpulsationsdämpfer umfasst. Der Druckpulsationsdämpfer ist dabei in einem Niederdruckbereich des Systems, insbesondere im Zulaufbereich einer Kraftstoffpumpe, angeordnet. Hier kommen die Vorteile eines erfindungsgemäßen Druckpulsationsdämpfers besonders gut zum Tragen, da im Niederdruckbereich, insbesondere im Zulaufbereich einer Kraftstoffpumpe besonders häufig Druckpulsationen auftreten, die das System belasten und die Funktion einzelner Systemkomponenten beeinträchtigen können. Wird der erfindungsgemäße Druckpulsationsdämpfer im Zulaufbereich einer als Kraftstoffpumpe angeordnet, kann über den Druckpulsationsdämpfer zugleich eine ausreichende Befüllung der Pumpe mit Kraftstoff sichergestellt werden. Dies gilt insbesondere, wenn es sich bei der Kraftstoffpumpe um eine Radialkolbenpumpe handelt.The further proposed fuel injection system, in particular common-rail injection system, is characterized in that it comprises a pressure pulsation damper according to the invention. The pressure pulsation damper is arranged in a low-pressure region of the system, in particular in the inlet region of a fuel pump. Here, the advantages of a Druckpulsationsdämpfers invention particularly well come into play, since in the low pressure region, especially in the inlet region of a fuel pump particularly frequently pressure pulsations occur that can burden the system and affect the function of individual system components. If the pressure pulsation damper according to the invention is arranged in the inlet region of a fuel pump, it is at the same time possible to ensure sufficient filling of the pump with fuel via the pressure pulsation damper. This is especially true when the fuel pump is a radial piston pump.

Bevorzugt ist demnach die Kraftstoffpumpe des vorgeschlagenen Kraftstoffeinspritzsystems eine Radialkolbenpumpe. Um Druck- und/oder Mengenwellen, die durch die Hubbewegung eines Pumpenkolbens verursacht werden, optimal aufnehmen bzw. kompensieren zu können, ist das im Druckdämpfungsraum des Druckpulsationsdämpfers vorhandene Gesamtgasvolumen deutlich größer als das Verdrängungsvolumen des hubbeweglichen Pumpenkolbens der Radialkolbenpumpe gewählt. Bevorzugt ist das Gesamtgasvolumen um ein Vielfaches größer als das Verdrängungsvolumen des Pumpenkolbens.Accordingly, the fuel pump of the proposed fuel injection system is preferably a radial piston pump. In order to absorb pressure and / or bulk waves caused by the lifting movement of a pump piston, optimally able to compensate for, which is present in the pressure damping chamber of the Druckpulsationsdämpfers total gas volume is much greater than the displacement volume of the stroke movable pump piston of the radial piston pump selected. Preferably, the total gas volume is many times greater than the displacement volume of the pump piston.

Bevorzugte Ausführungsformen der Erfindung werden nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen:

  • Fig. 1 einen schematischen Längsschnitt durch ein Beispiel eines Druckpulsationsdämpfers,
  • Fig. 2 einen schematischen Längsschnitt durch ein Beispiel eines Druckpulsationsdämpfers,
  • Fig. 3 einen schematischen Längsschnitt durch eine Ausführungsform eines erfindungsgemäßen Druckpulsationsdämpfers und
  • Fig. 4 einen schematischen Querschnitt durch den Druckpulsationsdämpfer der Fig. 3.
Preferred embodiments of the invention are explained below with reference to the accompanying drawings. These show:
  • Fig. 1 a schematic longitudinal section through an example of a pressure pulsation damper,
  • Fig. 2 a schematic longitudinal section through an example of a pressure pulsation damper,
  • Fig. 3 a schematic longitudinal section through an embodiment of a Druckpulsationsdämpfers invention and
  • Fig. 4 a schematic cross section through the pressure pulsation damper of Fig. 3 ,

Ausführliche Beschreibung der ZeichnungenDetailed description of the drawings

Der in der Fig. 1 dargestellte Druckpulsationsdämpfer 1 umfasst einen rohrförmigen Leitungsabschnitt 2 an den in einem Umfangsbereich ein zylinderförmiger Druckdämpfungsraum 5 angesetzt ist. Der Druckdämpfungsraum 5 ist über einen Rohransatz 14 und eine im rohrförmigen Leitungsabschnitt 2 ausgebildete mantelseitige Öffnung 4 mit einem Kraftstoffkanal 3 des rohrförmigen Leitungsabschnitts 2 verbunden, so dass Kraftstoff aus dem Kraftstoffkanal 3 in den Druckdämpfungsraum 5 gelangt. Der Druckdämpfungsraum 5 ist jedoch nur teilweise mit Kraftstoff 12 gefüllt, da ein anderer Teil des Druckdämpfungsraums 5 mit einem Gas 6 gefüllt ist. Bei dem Gas 6 handelt es sich um Luft, die ein komprimierbares Gasvolumen im Druckdämpfungsraum 5 ausbildet. Eine gewisse Trennung zwischen dem Kraftstoff 12 und dem Gas 6 wird über einen kolbenförmigen Schwimmer 8 bewirkt, der auf dem Kraftstoff schwimmt und bei einer den Kraftstoffkanal 3 durchströmenden Druck- und/oder Mengenwelle mit dem Kraftstoffspiegel im Druckdämpfungsraum 5 steigt und dabei das darüber liegende Gasvolumen verkleinert. Auf diese Weise wird eine Dämpfung der Druck- und/oder Mengenwellen bewirkt. Die schwimmende Aufnahme des Schwimmers 8 im Druckdämpfungsraum 5 ist durch einen Radialspalt 13 sichergestellt.The Indian Fig. 1 illustrated pressure pulsation damper 1 comprises a tubular conduit section 2 to which a cylindrical pressure damping chamber 5 is attached in a peripheral region. The pressure damping chamber 5 is connected via a tubular extension 14 and a shell-side opening 4 formed in the tubular conduit section 2 to a fuel channel 3 of the tubular conduit section 2, so that fuel passes from the fuel channel 3 into the pressure damping chamber 5. However, the pressure damping chamber 5 is only partially filled with fuel 12, since another part of the pressure damping chamber 5 is filled with a gas 6. The gas 6 is air, which forms a compressible gas volume in the pressure damping chamber 5. A certain separation between the fuel 12 and the gas 6 is effected via a piston-shaped float 8, which floats on the fuel and rises at a pressure and / or quantity wave flowing through the fuel channel 3 with the fuel level in the pressure damping chamber 5 and thereby the gas volume above reduced. In this way, an attenuation of the pressure and / or mass waves is effected. The floating seat of the float 8 in the pressure damping chamber 5 is ensured by a radial gap 13.

Eine weiteres Beispiel eines Druckpulsationsdämpfers ist in der Fig. 2 dargestellt. Dieser unterscheidet sich von dem der Fig. 1 insbesondere dadurch, dass das Gasvolumen auf viele als Hohlkugeln ausgebildete Elemente 7 verteilt ist, die mit dem Gas 6 gefüllt sind. Außen sind die Elemente 7 von dem Kraftstoff 12 umgeben.Another example of a Druckpulsationsdämpfers is in the Fig. 2 shown. This differs from that of the Fig. 1 in particular in that the gas volume is distributed over many elements formed as hollow spheres 7, which are filled with the gas 6. On the outside, the elements 7 are surrounded by the fuel 12.

Die gasgefüllten Elemente 7 sind aus einem Material gebildet, das elastisch verformbar ist. Unter Druckeinwirkung verformen sich die Elemente 7, wobei das Gas 6 komprimiert wird. Zugleich bewegen sich die Elemente 7 relativ zueinander, wobei neue Zwickelräume entstehen, in denen sich Druck- und/oder Mengenwellen verlaufen können. Der Druckpulsationsdämpfer 1 besitzt somit unterschiedliche Wirkungsweisen, die gleichzeitig zum Einsatz gelangen und somit die Pulsationsdämpfung noch effektiver gestalten.The gas-filled elements 7 are formed of a material which is elastically deformable. Under pressure, the elements deform 7, wherein the gas 6 is compressed. At the same time, the elements 7 move relative to each other, creating new gusset spaces in which pressure and / or bulk waves can pass. The pressure pulsation damper 1 thus has different modes of action that are used simultaneously and thus make the pulsation damping even more effective.

Der Druckpulsationsdämpfer 1 der Fig. 2 besitzt zudem einen rohrförmigen Leitungsabschnitt 2, der an seinen beiden Enden jeweils einen Anschlussstutzen 9, 10 ausbildet, über den der Druckpulsationsdämpfer 1 an eine Kraftstoffleitung (nicht dargestellt) bzw. an ein Gehäuseteil 11 einer Kraftstoffpumpe (nicht dargestellt) anschließbar ist. Im Gehäuseteil 11 ist hierzu eine entsprechende Ausnehmung 15 vorgesehen, in welche der Anschlussstutzen 10 eingesetzt bzw. eingepresst werden kann. Der Presssitz gewährleistet zugleich einen fluiddichten Anschluss.The pressure pulsation damper 1 of Fig. 2 also has a tubular conduit portion 2, which forms at its two ends in each case a connecting piece 9, 10, via which the pressure pulsation damper 1 (not shown) or to a housing part 11 of a fuel pump (not shown) can be connected. In the housing part 11 a corresponding recess 15 is provided for this purpose, in which the connecting piece 10 can be inserted or pressed. The press fit also ensures a fluid-tight connection.

Gelichwohl in der Fig. 1 nicht dargestellt, kann auch der dort abgebildete Druckpulsationsdämpfer 1 an mindestens einem Ende einen Anschlussstutzen 9, 10 aufweisen.Luckily in the Fig. 1 not shown, the pressure pulsation damper 1 shown there may also have a connection piece 9, 10 at at least one end.

Eine Ausführungsform der Erfindung geht aus den Figuren 3 und 4 hervor. Hier ist der Druckdämpfungsraum 5 ringförmig ausgebildet und um den rohrförmigen Leitungsabschnitt 2 angeordnet. Mehrere mantelseitige Öffnungen 4 verbinden den im Inneren des rohrförmigen Leitungsabschnitts 2 ausgebildeten Kraftstoffkanal 3 mit dem ringförmigen Druckdämpfungsraum 5, in dem in ringförmiger Anordnung mehrere kugelförmige gasgefüllte Elemente 7 aufgenommen sind (siehe Fig. 4). Die Elemente 7 sind außen von Kraftstoff 12 umgeben, so dass im Kraftstoff 12 auftretende Druck- und/oder Mengenwellen durch eine elastische Verformung der Elemente 7 gedämpft werden.An embodiment of the invention is based on FIGS. 3 and 4 out. Here, the pressure damping chamber 5 is annular and arranged around the tubular conduit section 2. A plurality of shell-side openings 4 connect the fuel channel 3 formed in the interior of the tubular conduit section 2 to the annular pressure-damping chamber 5 in which a plurality of spherical gas-filled elements 7 are received in an annular arrangement (see Fig. 4 ). The elements 7 are surrounded on the outside by fuel 12, so that occurring in the fuel 12 Pressure and / or mass waves are attenuated by an elastic deformation of the elements 7.

Allen dargestellten Ausführungsformen ist gemein, dass das Gas 6 bei seiner Komprimierung Energie aufnimmt, die es später, wenn der Druck wieder fällt, an den Kraftstoff abgibt. Dieser Vorgang wird unterstützend bei der Befüllung einer dem Druckpulsationsdämpfer 1 nachgeschalteten Kraftstoffstoffpumpe, so dass der Wirkungsgrad der Kraftstoffpumpe steigt.All embodiments shown have in common that the gas 6 absorbs energy during its compression, which it later delivers to the fuel when the pressure drops again. This process is assisting in the filling of a fuel pump downstream of the pressure pulsation damper 1, so that the efficiency of the fuel pump increases.

Claims (4)

  1. Pressure pulsation damper (1) for a fuel injection system, in particular a common-rail injection system, comprising a tubular line section (2) in which there is formed a fuel channel (3) which is connected to a pressure damping chamber (5), the pressure damping chamber (5) being annular and arranged around the tubular line section (2),
    characterized in that multiple shell-side openings (4) connect the fuel channel (3) formed in the interior of the tubular line section (2) to the annular pressure damping chamber (5), wherein multiple spherical gas-filled elements (7) are accommodated in an annular arrangement in the pressure damping chamber (5).
  2. Pressure pulsation damper (1) according to Claim 1,
    characterized in that the tubular line section (2) forms or comprises a connecting piece (9, 10) at at least one end, via which the pressure pulsation damper (1) can be connected to a fuel line and/or to a housing part (11) of a component of the fuel injection system, in particular a fuel pump.
  3. Fuel injection system, in particular common-rail injection system, having a pressure pulsation damper (1) according to one of the preceding claims, wherein the pressure pulsation damper (1) is arranged in a low-pressure region of the system, in particular in the feed region of a fuel pump.
  4. Fuel injection system according to Claim 3,
    characterized in that the fuel pump is a radial piston pump and the total gas volume present in the pressure damping chamber (5) of the pressure pulsation damper (1) is greater than the displacement volume of a reciprocating pump piston of the radial piston pump.
EP16741959.7A 2015-09-23 2016-07-26 Pressure pulsation damper for a fuel injection system, and fuel injection system Active EP3353410B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015218223.1A DE102015218223A1 (en) 2015-09-23 2015-09-23 Pressure pulsation damper for a fuel injection system as well as fuel injection system
PCT/EP2016/067728 WO2017050467A1 (en) 2015-09-23 2016-07-26 Pressure pulsation damper for a fuel injection system, and fuel injection system

Publications (2)

Publication Number Publication Date
EP3353410A1 EP3353410A1 (en) 2018-08-01
EP3353410B1 true EP3353410B1 (en) 2019-10-16

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EP16741959.7A Active EP3353410B1 (en) 2015-09-23 2016-07-26 Pressure pulsation damper for a fuel injection system, and fuel injection system

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EP (1) EP3353410B1 (en)
CN (1) CN108138723A (en)
DE (1) DE102015218223A1 (en)
WO (1) WO2017050467A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018204556B3 (en) 2018-03-26 2019-05-16 Continental Automotive Gmbh High-pressure fuel pump for a fuel injection system
US11692537B2 (en) 2021-01-11 2023-07-04 Comet-ME Ltd. Method and system for damping flow pulsation

Citations (1)

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Publication number Priority date Publication date Assignee Title
JP2000213434A (en) * 1999-01-20 2000-08-02 Toyoda Gosei Co Ltd Fuel pressure regulating device

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
FR1217228A (en) * 1958-12-05 1960-05-02 Neyrpic Ets Energy store or pulsation damper
JP3206361B2 (en) * 1995-04-13 2001-09-10 三菱自動車工業株式会社 Fuel supply device
JP4641387B2 (en) * 2004-06-01 2011-03-02 日産自動車株式会社 Fluid coupling
DE102006037179A1 (en) 2006-08-09 2008-02-14 Robert Bosch Gmbh Fuel injection system with a pressure vibration damper
JP2008095537A (en) * 2006-10-06 2008-04-24 Toyota Motor Corp Fuel supply device for internal combustion engine
DE102013218878A1 (en) * 2013-09-19 2015-03-19 Robert Bosch Gmbh Fluid delivery system
US20150226166A1 (en) * 2014-02-11 2015-08-13 Hyundai Motor Company Device for reducing pulsation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000213434A (en) * 1999-01-20 2000-08-02 Toyoda Gosei Co Ltd Fuel pressure regulating device

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WO2017050467A1 (en) 2017-03-30
EP3353410A1 (en) 2018-08-01
DE102015218223A1 (en) 2017-03-23
CN108138723A (en) 2018-06-08

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