EP1312792B1 - Fuel injection apparatus for an internal combustion engine - Google Patents

Fuel injection apparatus for an internal combustion engine Download PDF

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Publication number
EP1312792B1
EP1312792B1 EP02022358A EP02022358A EP1312792B1 EP 1312792 B1 EP1312792 B1 EP 1312792B1 EP 02022358 A EP02022358 A EP 02022358A EP 02022358 A EP02022358 A EP 02022358A EP 1312792 B1 EP1312792 B1 EP 1312792B1
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EP
European Patent Office
Prior art keywords
space
fuel
pressure
fuel injection
control
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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.)
Expired - Lifetime
Application number
EP02022358A
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German (de)
French (fr)
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EP1312792A3 (en
EP1312792A2 (en
Inventor
Peter Grabandt
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1312792A3 publication Critical patent/EP1312792A3/en
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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
    • 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
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator

Definitions

  • the invention is based on a Fuel injection device for an internal combustion engine according to the preamble of claim 1.
  • Such a fuel injector is through the EP 0 957 261 A known.
  • This fuel injection device has one for each cylinder of the internal combustion engine High-pressure fuel pump and a connected to this Fuel injection valve on.
  • the high-pressure fuel pump has a by the internal combustion engine in one Stroke driven pump piston, the one Pump work space limited. With the pump work space is a pressure space of the fuel injection valve is connected, the an injection valve member, through which at least one Injection opening is controlled and by the in the Pressure chamber prevailing pressure applied in one Opening direction for releasing the at least one Injection opening is movable.
  • the high-pressure fuel pump and the fuel injection valve are separate from each other arranged on the internal combustion engine and via a line connected with each other.
  • the fuel injection device with the Features according to claim 1 has the advantage that through the control valve fuel into the storage space is controlled, from which in a subsequent suction stroke the pump piston fuel is removed, so that the Pump work space only part of the filling required amount of fuel from the Fuel tank needs to suck. Furthermore occur in the low pressure range of Fuel injection device when bleeding off fuel by the control valve in the storage space no pressure surges on.
  • the storage space sufficiently large volume up, even at lower Fuel injection amount and thus larger of the control valve to be able to absorb these amounts of fuel.
  • the Training according to claim 4 allows a flexible Control the fuel injection by putting at high pressure closed in the control pressure chamber, the fuel injection valve can be.
  • FIG. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation according to a first Embodiment, Figure 2 on a pressure curve Injection openings of a fuel injection valve of Fuel injection device according to the first Embodiment and Figure 3 the Fuel injection device according to a second Embodiment.
  • FIGs 1 and 3 is a Fuel injection device for an internal combustion engine a motor vehicle shown.
  • the Fuel injector is called a so-called pump-line-nozzle system trained and points for each cylinder the internal combustion engine each have a fuel pump 10, a Fuel injection valve 12 and a the Fuel injection valve 12 with the fuel pump 10th connecting line 14 on.
  • the fuel pump 10 has one in a cylinder bore 16 of a pump body 15th tightly guided pump piston 18, which by a cam 20 of a camshaft of the internal combustion engine against the force a return spring 19 driven in a lifting movement becomes.
  • the pump piston 18 is limited in the cylinder bore 16th a pump working chamber 22, in which by the pump piston 18th Fuel is compressed under high pressure.
  • the Pump work chamber 22 becomes fuel from a Fuel tank 24 is supplied, for example by means of a low-pressure pump, not shown.
  • the fuel injection valve 12 is separate from the Fuel pump 10 is arranged and via the line 14 with connected to the pump working space 22.
  • the Fuel injection valve 12 has a valve body 26 on, which may be formed in several parts, in the one piston-shaped injection valve member 28 in a bore 30th is guided longitudinally displaceable.
  • the valve body 26 indicates its the combustion chamber of the cylinder of the internal combustion engine facing end region at least one, preferably a plurality Injection openings 32.
  • the injection valve member 28 has at its the combustion chamber end facing a For example, about conical sealing surface 34, which with a valve seat 26 formed in the valve body 36th cooperates, from or after the injection ports 32 dissipate.
  • valve body 26 is between the Injector member 28 and the bore 30 to the valve seat 36th towards an annular space 38 present, by a radial Extension of the bore 30 in an injection valve member 28 surrounding pressure chamber 40 passes.
  • the Injection valve member 28 has in the region of the pressure chamber 40th a pressure shoulder 42 on. At the end remote from the combustion chamber the injection valve member 28 engages a prestressed Closing spring 44, through which the injection valve member 28th is pressed toward the valve seat 36.
  • the closing spring 44 is arranged in a spring chamber 46 of the valve body 26, the adjoins the bore 30.
  • To the spring chamber 46 can at the bore 30 facing away from the end in Valve body 26 connect another bore 48, in the a piston 50 is guided tightly, with the Injection valve member 28 is connected.
  • the piston 50 limited with its spring chamber 46 facing away from the end face a control pressure chamber 52 in the valve body 26th
  • the line 14 opens into the valve body 26 and leads into this in a formed in the valve body 26 channel to Pressure chamber 40.
  • Within the valve body 26 branches from the Line 14 from a channel 54 from which in the valve body 26th trained memory space 56 leads. The passage through the Channel 54 is controlled by an electrically operated control valve 58 controlled.
  • Within the valve body 26 may also from the conduit 14, a channel 60 branch off to the Control pressure chamber 52 leads.
  • the control pressure chamber 52 is also via a channel 62 with the storage space 56th connected.
  • the storage space 56 may, for example, in a hole in Valve body 26 may be formed, which has a resilient limit in the form of a storage piston 64 which extends over a biased return spring 65 is supported.
  • a storage piston 64 which extends over a biased return spring 65 is supported.
  • the Storage space 56 is dimensioned such that the volume, which can be included in the memory space 56, at least is as large as the volume through the pump piston 18th the high-pressure fuel pump 10 at a delivery stroke is encouraged.
  • Embodiment of the fuel injection device is another electrically operated control valve 68th provided through which the passage through the channel 60 of the line 14 is controlled in the control pressure chamber 52.
  • in the Channel 60 is preferably a first throttle 61 provided and in the channel 62 from the control pressure chamber 52 for Storage space 56 is preferably a second throttle 63 provided.
  • the control pressure chamber 52 is above the channel 62 constantly connected to the storage space 56.
  • the two control valves 58 and 68 can each one electromagnetic actuator, a piezoelectric actuator or a have other fast-switching actuator.
  • the Control valves 58,68 are by an electronic Control device 70 depending on operating parameters of Internal combustion engine activated.
  • the two control valves 58.68 can each as shown in Figure 1 as a 2/2-way valve be formed between an open Switching position in which the passage through the channel 60 or 62 is released, and a closed switch position, in which the passage through the channel 60 and 62 interrupted is, are switchable.
  • the first Control valve 58 to be in its open switching position, so that initially conveyed fuel in the storage space 56 will and will not be sufficient high pressure for a Fuel injection can build up.
  • the controller 70 in its closed Switched position, so that the line 14 from Memory space 56 is disconnected. It can also be provided that the first control valve 58 during the delivery of the Pump piston 18 in its closed switching position is brought and the second control valve 68 in his opened switch position is brought.
  • the control pressure chamber 52 is then connected to the line 14, so that in this there is an increased pressure, which via the control piston 50 the fuel injector 12 keeps closed. If the Fuel injection should start, so will the second Control valve 68 by the controller 70 in his closed switch position brought so that the Control pressure chamber 52 is separated from the line 14 and in this only the pressure of the storage space 56 prevails. If the in the pressure chamber 40 of the fuel injection valve 12th prevailing pressure a the force of the closing spring 44 and the on the control piston 50 acting pressure force exceeding Force generated on the injection valve member 28, so moved This is in the opening direction 29 and gives the Injection openings 32 free.
  • the first control valve 58 in his opened switch position brought so that the from Pump piston 18 pumped fuel into the storage space 56th passes and the pressure in the pressure chamber 40 drops so that the fuel injection valve 12 closes.
  • the second control valve 68 in his opened switch position brought so that the Fuel injection valve 12 through the control pressure chamber 52nd prevailing high pressure on the control piston 50 is closed becomes. In the pressure chamber 40 prevails by in his closed switching position remaining first control valve 58 also high pressure.
  • the second control valve 68 closed again, so that the control pressure chamber 52nd is relieved and the fuel injection valve 12 opens.
  • the first control valve 58 in his opened switch position and the second Control valve 68 brought into its open switching position or left in its closed position.
  • the Fuel injector may be the second Control valve 68 or 168 and the control piston 50 and the Control pressure chamber 52 omitted and it is only the first control valve 58 is provided.
  • the Fuel injection only by the first control valve 58th controlled wherein during the delivery stroke of the pump piston 18th with open control valve 58 in the pump working chamber 22, in the line 14 and in the pressure chamber 40 do not build high pressure can and thus no fuel injection takes place.
  • at closed control valve 58 may be in the pressure chamber 40th Build high pressure and the fuel injector 12th opens when the pressure in the pressure chamber 40 on the Injector member 28 generates force in the opening direction 29 is greater than the force of the closing spring 44. Zur Interruption or termination of fuel injection the control valve 58 is opened, so that the pressure chamber 40th is relieved.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine nach der Gattung des Anspruchs 1.The invention is based on a Fuel injection device for an internal combustion engine according to the preamble of claim 1.

Eine solche Kraftstoffeinspritzeinrichtung ist durch die EP 0 957 261 A bekannt. Diese Kraftstoffeinspritzeinrichtung weist für jeden Zylinder der Brennkraftmaschine jeweils eine Kraftstoffhochdruckpumpe und ein mit dieser verbundenes Kraftstoffeinspritzventil auf. Die Kraftstoffhochdruckpumpe weist einen durch die Brennkraftmaschine in einer Hubbewegung angetriebenen Pumpenkolben auf, der einen Pumpenarbeitsraum begrenzt. Mit dem Pumpenarbeitsraum ist ein Druckraum des Kraftstoffeinspritzventils verbunden, das ein Einspritzventilglied aufweist, durch das wenigstens eine Einspritzöffnung gesteuert wird und das durch den im Druckraum herrschenden Druck beaufschlagt in einer Öffnungsrichtung zur Freigabe der wenigstens einen Einspritzöffnung bewegbar ist. Die Kraftstoffhochdruckpumpe und das Kraftstoffeinspritzventil sind getrennt voneinander an der Brennkraftmaschine angeordnet und über eine Leitung miteinander verbunden. An der Kraftstoffhochdruckpumpe ist ein elektrisch betätigtes Steuerventil angeordnet, durch das eine Verbindung des Pumpenarbeitsraums und damit der Leitung mit einem Entlastungsraum gesteuert wird, als der zumindest mittelbar der Kraftstoffvorratsbehälter dient. Nachteilig bei dieser bekannten Kraftstoffeinspritzeinrichtung ist, daß bei geöffnetem Steuerventil von der Kraftstoffhochdruckpumpe geförderter Kraftstoff zum Kraftstoffvorratsbehälter hin abgesteuert wird und beim nachfolgenden Saughub des Pumpenkolbens durch diesen wieder die gesamte Kraftstoffmenge angesaugt werden muß. Hierdurch wird der Wirkungsgrad der Kraftstoffeinspritzeinrichtung verschlechtert. Außerdem entstehen durch das Absteuern des vom Pumpenkolben geförderten Kraftstoffs zum Kraftstoffvorratsbehälter hin in dem mit diesem verbundenen Niederdrucksystem Druckstöße, durch die die Funktion und Haltbarkeit der Kraftstoffeinspritzeinrichtung beeinträchtigt wird.Such a fuel injector is through the EP 0 957 261 A known. This fuel injection device has one for each cylinder of the internal combustion engine High-pressure fuel pump and a connected to this Fuel injection valve on. The high-pressure fuel pump has a by the internal combustion engine in one Stroke driven pump piston, the one Pump work space limited. With the pump work space is a pressure space of the fuel injection valve is connected, the an injection valve member, through which at least one Injection opening is controlled and by the in the Pressure chamber prevailing pressure applied in one Opening direction for releasing the at least one Injection opening is movable. The high-pressure fuel pump and the fuel injection valve are separate from each other arranged on the internal combustion engine and via a line connected with each other. At the high-pressure fuel pump is an electrically operated control valve arranged through the a connection of the pump working space and thus the line is controlled with a discharge space, as the least indirectly the fuel tank is used. adversely in this known fuel injection device is that with open control valve from the high-pressure fuel pump subsidized fuel to the fuel tank is diverted and at the subsequent suction stroke of the Pump piston through this again the entire Fuel quantity must be sucked. This will be the Efficiency of the fuel injector deteriorated. In addition, caused by the Absteuern of pumped by the pump piston fuel for Fuel tank out in the associated with this Low pressure system pressure surges through which the function and Durability of the fuel injector is impaired.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzeinrichtung mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, daß durch das Steuerventil Kraftstoff in den Speicherraum abgesteuert wird, aus dem bei einem nachfolgenden Saughub des Pumpenkolbens Kraftstoff entnommen wird, so daß dem Pumpenarbeitsraum nur ein Teil der zur Befüllung erforderlichen Kraftstoffmenge aus dem Kraftstoffvorratsbehälter anzusaugen braucht. Außerdem treten im Niederdruckbereich der Kraftstoffeinspritzeinrichtung beim Absteuern von Kraftstoff durch das Steuerventil in den Speicherraum keine Druckstöße auf.The fuel injection device according to the invention with the Features according to claim 1 has the advantage that through the control valve fuel into the storage space is controlled, from which in a subsequent suction stroke the pump piston fuel is removed, so that the Pump work space only part of the filling required amount of fuel from the Fuel tank needs to suck. Furthermore occur in the low pressure range of Fuel injection device when bleeding off fuel by the control valve in the storage space no pressure surges on.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffeinspritzeinrichtung angegeben. Durch die Ausbildung gemäß Anspruch 2 weist der Speicherraum ein ausreichend großes Volumen auf, um auch bei geringer Kraftstoffeinspritzmenge und damit großer vom Steuerventil abgesteuerter Kraftstoffmenge diese aufnehmen zu können. Die Weiterbildung gemäß Anspruch 4 ermöglicht eine flexible Steuerung der Kraftstoffeinspritzung, indem bei hohem Druck im Steuerdruckraum das Kraftstoffeinspritzventil geschlossen werden kann.In the dependent claims are advantageous Embodiments and developments of the invention Fuel injector specified. By the Training according to claim 2, the storage space sufficiently large volume up, even at lower Fuel injection amount and thus larger of the control valve to be able to absorb these amounts of fuel. The Training according to claim 4 allows a flexible Control the fuel injection by putting at high pressure closed in the control pressure chamber, the fuel injection valve can be.

Zeichnungdrawing

Mehrere Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine in schematischer Darstellung gemäß einem ersten Ausführungsbeispiel, Figur 2 einen Druckverlauf an Einspritzöffnungen eines Kraftstoffeinspritzventils der Kraftstoffeinspritzeinrichtung gemäß dem ersten Ausführungsbeispiel und Figur 3 die Kraftstoffeinspritzeinrichtung gemäß einem zweiten Ausführungsbeispiel.Several embodiments of the invention are in the Drawing shown and in the following description explained in more detail. FIG. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation according to a first Embodiment, Figure 2 on a pressure curve Injection openings of a fuel injection valve of Fuel injection device according to the first Embodiment and Figure 3 the Fuel injection device according to a second Embodiment.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In den Figuren 1 und 3 ist eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine eines Kraftfahrzeugs dargestellt. Die Kraftstoffeinspritzeinrichtung ist als sogenanntes Pumpe-Leitung-Düse-System ausgebildet und weist für jeden Zylinder der Brennkraftmaschine jeweils eine Kraftstoffpumpe 10, ein Kraftstoffeinspritzventil 12 und eine das Kraftstoffeinspritzventil 12 mit der Kraftstoffpumpe 10 verbindende Leitung 14 auf. Die Kraftstoffpumpe 10 weist einen in einer Zylinderbohrung 16 eines Pumpenkörpers 15 dicht geführten Pumpenkolben 18 auf, der durch einen Nocken 20 einer Nockenwelle der Brennkraftmaschine gegen die Kraft einer Rückstellfeder 19 in einer Hubbewegung angetrieben wird. Der Pumpenkolben 18 begrenzt in der Zylinderbohrung 16 einen Pumpenarbeitsraum 22, in dem durch den Pumpenkolben 18 Kraftstoff unter Hochdruck verdichtet wird. Dem Pumpenarbeitsraum 22 wird Kraftstoff aus einem Kraftstoffvorratsbehälter 24 zugeführt, beispielsweise mittels einer nicht dargestellten Niederdruckpumpe. Der Pumpenarbeitsraum 22 weist eine Verbindung 17 zum Kraftstoffvorratsbehälter 24 auf, in der ein zum Pumpenarbeitsraum 22 hin öffnendes Rückschlagventil 21 vorgesehen ist, das im Pumpenkörper 15 angeordnet sein kann.In Figures 1 and 3 is a Fuel injection device for an internal combustion engine a motor vehicle shown. The Fuel injector is called a so-called pump-line-nozzle system trained and points for each cylinder the internal combustion engine each have a fuel pump 10, a Fuel injection valve 12 and a the Fuel injection valve 12 with the fuel pump 10th connecting line 14 on. The fuel pump 10 has one in a cylinder bore 16 of a pump body 15th tightly guided pump piston 18, which by a cam 20 of a camshaft of the internal combustion engine against the force a return spring 19 driven in a lifting movement becomes. The pump piston 18 is limited in the cylinder bore 16th a pump working chamber 22, in which by the pump piston 18th Fuel is compressed under high pressure. the Pump work chamber 22 becomes fuel from a Fuel tank 24 is supplied, for example by means of a low-pressure pump, not shown. Of the Pump workspace 22 has a connection 17 to Fuel tank 24, in the one to Pump working chamber 22 toward opening check valve 21st is provided, which may be arranged in the pump body 15.

Das Kraftstoffeinspritzventil 12 ist getrennt von der Kraftstoffpumpe 10 angeordnet und über die Leitung 14 mit dem Pumpenarbeitsraum 22 verbunden. Das Kraftstoffeinspritzventil 12 weist einen Ventilkörper 26 auf, der mehrteilig ausgebildet sein kann, in dem ein kolbenförmiges Einspritzventilglied 28 in einer Bohrung 30 längsverschiebbar geführt ist. Der Ventilkörper 26 weist an seinem dem Brennraum des Zylinders der Brennkraftmaschine zugewandten Endbereich wenigstens eine, vorzugsweise mehrere Einspritzöffnungen 32 auf. Das Einspritzventilglied 28 weist an seinem dem Brennraum zugewandten Endbereich eine beispielsweise etwa kegelförmige Dichtfläche 34 auf, die mit einem im Ventilkörper 26 ausgebildeten Ventilsitz 36 zusammenwirkt, von dem oder nach dem die Einspritzöffnungen 32 abführen. Im Ventilkörper 26 ist zwischen dem Einspritzventilglied 28 und der Bohrung 30 zum Ventilsitz 36 hin ein Ringraum 38 vorhanden, der durch eine radiale Erweiterung der Bohrung 30 in einen das Einspritzventilglied 28 umgebenden Druckraum 40 übergeht. Das Einspritzventilglied 28 weist im Bereich des Druckraums 40 eine Druckschulter 42 auf. Am dem Brennraum abgewandten Ende des Einspritzventilglieds 28 greift eine vorgespannte Schließfeder 44 an, durch die das Einspritzventilglied 28 zum Ventilsitz 36 hin gedrückt wird. Die Schließfeder 44 ist in einem Federraum 46 des Ventilkörpers 26 angeordnet, der sich an die Bohrung 30 anschließt. An den Federraum 46 kann sich an dessen der Bohrung 30 abgewandtem Ende im Ventilkörper 26 eine weitere Bohrung 48 anschließen, in der ein Kolben 50 dicht geführt ist, der mit dem Einspritzventilglied 28 verbunden ist. Der Kolben 50 begrenzt mit seiner dem Federraum 46 abgewandten Stirnfläche einen Steuerdruckraum 52 im Ventilkörper 26.The fuel injection valve 12 is separate from the Fuel pump 10 is arranged and via the line 14 with connected to the pump working space 22. The Fuel injection valve 12 has a valve body 26 on, which may be formed in several parts, in the one piston-shaped injection valve member 28 in a bore 30th is guided longitudinally displaceable. The valve body 26 indicates its the combustion chamber of the cylinder of the internal combustion engine facing end region at least one, preferably a plurality Injection openings 32. The injection valve member 28 has at its the combustion chamber end facing a For example, about conical sealing surface 34, which with a valve seat 26 formed in the valve body 36th cooperates, from or after the injection ports 32 dissipate. In the valve body 26 is between the Injector member 28 and the bore 30 to the valve seat 36th towards an annular space 38 present, by a radial Extension of the bore 30 in an injection valve member 28 surrounding pressure chamber 40 passes. The Injection valve member 28 has in the region of the pressure chamber 40th a pressure shoulder 42 on. At the end remote from the combustion chamber the injection valve member 28 engages a prestressed Closing spring 44, through which the injection valve member 28th is pressed toward the valve seat 36. The closing spring 44 is arranged in a spring chamber 46 of the valve body 26, the adjoins the bore 30. To the spring chamber 46 can at the bore 30 facing away from the end in Valve body 26 connect another bore 48, in the a piston 50 is guided tightly, with the Injection valve member 28 is connected. The piston 50 limited with its spring chamber 46 facing away from the end face a control pressure chamber 52 in the valve body 26th

Die Leitung 14 mündet in den Ventilkörper 26 und führt in diesem in einem im Ventilkörper 26 ausgebildeten Kanal zum Druckraum 40. Innerhalb des Ventilkörpers 26 zweigt von der Leitung 14 ein Kanal 54 ab, der zu einem im Ventilkörper 26 ausgebildeten Speicherraum 56 führt. Der Durchgang durch den Kanal 54 wird durch ein elektrisch betätigtes Steuerventil 58 gesteuert. Innerhalb des Ventilkörpers 26 kann außerdem von der Leitung 14 ein Kanal 60 abzweigen, der zum Steuerdruckraum 52 führt. Der Steuerdruckraum 52 ist außerdem über einen Kanal 62 mit dem Speicherraum 56 verbunden.The line 14 opens into the valve body 26 and leads into this in a formed in the valve body 26 channel to Pressure chamber 40. Within the valve body 26 branches from the Line 14 from a channel 54 from which in the valve body 26th trained memory space 56 leads. The passage through the Channel 54 is controlled by an electrically operated control valve 58 controlled. Within the valve body 26 may also from the conduit 14, a channel 60 branch off to the Control pressure chamber 52 leads. The control pressure chamber 52 is also via a channel 62 with the storage space 56th connected.

Der Speicherraum 56 kann beispielsweise in einer Bohrung im Ventilkörper 26 gebildet sein, die eine federnde Begrenzung in Form eines Speicherkolbens 64 aufweist, der sich über eine vorgespannte Rückstellfeder 65 abstützt. Der Speicherraum 56 ist derart dimensioniert, daß das Volumen, das im Speicherraum 56 aufgenommen werden kann, wenigstens so groß ist wie das Volumen, das durch den Pumpenkolben 18 der Kraftstoffhochdruckpumpe 10 bei einem Förderhub gefördert wird.The storage space 56 may, for example, in a hole in Valve body 26 may be formed, which has a resilient limit in the form of a storage piston 64 which extends over a biased return spring 65 is supported. Of the Storage space 56 is dimensioned such that the volume, which can be included in the memory space 56, at least is as large as the volume through the pump piston 18th the high-pressure fuel pump 10 at a delivery stroke is encouraged.

Bei einem in Figur 1 dargestellten ersten Ausführungsbeispiel der Kraftstoffeinspritzeinrichtung ist ein weiteres elektrisch betätigtes Steuerventil 68 vorgesehen, durch das der Durchgang durch den Kanal 60 von der Leitung 14 in den Steuerdruckraum 52 gesteuert wird. Im Kanal 60 ist vorzugsweise eine erste Drosselstelle 61 vorgesehen und im Kanal 62 vom Steuerdruckraum 52 zum Speicherraum 56 ist vorzugsweise eine zweite Drosselstelle 63 vorgesehen. Der Steuerdruckraum 52 ist über den Kanal 62 ständig mit dem Speicherraum 56 verbunden. Durch entsprechende Dimensionierung der Drosselstellen 61,63 kann der Zulauf und Ablauf von Kraftstoff in bzw. aus dem Steuerdruckraum 52 in geeigneter Weise eingestellt werden. Die beiden Steuerventile 58 und 68 können jeweils einen elektromagnetischen Aktor, einen Piezoaktor oder einen anderen schnellschaltenden Aktor aufweisen. Die Steuerventile 58,68 werden durch eine elektronische Steuereinrichtung 70 abhängig von Betriebsparametern der Brennkraftmaschine angesteuert. Die beiden Steuerventile 58,68 können wie in Figur 1 dargestellt jeweils als 2/2-Wegeventil ausgebildet sein, die zwischen einer geöffneten Schaltstellung, in der der Durchgang durch den Kanal 60 bzw. 62 freigegeben ist, und einer geschlossenen Schaltstellung, in der der Durchgang durch den Kanal 60 bzw. 62 unterbrochen ist, umschaltbar sind.In a first shown in Figure 1 Embodiment of the fuel injection device is another electrically operated control valve 68th provided through which the passage through the channel 60 of the line 14 is controlled in the control pressure chamber 52. in the Channel 60 is preferably a first throttle 61 provided and in the channel 62 from the control pressure chamber 52 for Storage space 56 is preferably a second throttle 63 provided. The control pressure chamber 52 is above the channel 62 constantly connected to the storage space 56. By appropriate dimensioning of the throttle bodies 61,63 can the inflow and outflow of fuel into or out of the Control pressure chamber 52 can be adjusted in a suitable manner. The two control valves 58 and 68 can each one electromagnetic actuator, a piezoelectric actuator or a have other fast-switching actuator. The Control valves 58,68 are by an electronic Control device 70 depending on operating parameters of Internal combustion engine activated. The two control valves 58.68 can each as shown in Figure 1 as a 2/2-way valve be formed between an open Switching position in which the passage through the channel 60 or 62 is released, and a closed switch position, in which the passage through the channel 60 and 62 interrupted is, are switchable.

Nachfolgend wird die Funktion der Kraftstoffeinspritzeinrichtung gemäß dem ersten Ausführungsbeispiel erläutert. Beim Saughub des Pumpenkolbens 18 befindet sich das erste Steuerventil 58 in seiner geöffneten Schaltstellung, so daß die Verbindung der Leitung 14 mit dem Speicherraum 56 geöffnet ist. Das zweite Steuerventil 68 befindet sich in seiner geschlossenen Schaltstellung, so der Steuerdruckraum 52 von der Leitung 14 getrennt ist. Im Speicherraum 56 vorhandender und unter Druck gespeicherter Kraftstoff wird über die Leitung 14 dem Pumpenarbeitsraum 22 zugeführt, bis der Speicherraum 56 entleert ist. Der Druck im Speicherraum 56 ist dabei vorzugsweise höher als der Druck im Niederdruckbereich der Kraftstoffeinspritzeinrichtung stromaufwärts vor dem Rückschlagventil 21, so daß dieses geschlossen ist, bis der Speicherraum 56 entleert ist. Bei weiterem Saughub wird durch den Pumpenkolben 18 bei geöffnetem Rückschlagventil 21 Kraftstoff aus dem Kraftstoffvorratsbehälter 24 angesaugt. Beim nachfolgenden Förderhub des Pumpenkolbens 18 schließt das Rückschlagventil 21 und der Pumpenkolben 18 fördert Kraftstoff über die Leitung 14 zum Kraftstoffeinspritzventil 12. Beim Förderhub des Pumpenkolbens 18 kann das erste Steuerventil 58 in seiner geöffneten Schaltstellung sein, so daß zunächst Kraftstoff in den Speicherraum 56 gefördert wird und sich kein ausreichender Hochdruck für eine Kraftstoffeinspritzung aufbauen kann. Zum Beginn der Kraftstoffeinspritzung wird dann das erste Steuerventil 58 durch die Steuereinrichtung 70 in seine geschlossene Schaltstellung umgeschaltet, so daß die Leitung 14 vom Speicherraum 56 getrennt ist. Es kann auch vorgesehen sein, daß das erste Steuerventil 58 beim Förderhub des Pumpenkolbens 18 in seine geschlossene Schaltstellung gebracht wird und das zweite Steuerventil 68 in seine geöffnete Schaltstellung gebracht wird. Der Steuerdruckraum 52 ist dann mit der Leitung 14 verbunden, so daß in diesem ein erhöhter Druck herrscht, der über den Steuerkolben 50 das Kraftstoffeinspritzventil 12 geschlossen hält. Wenn die Kraftstoffeinspritzung beginnen soll, so wird das zweite Steuerventil 68 durch die Steuereinrichtung 70 in seine geschlossene Schaltstellung gebracht, so daß der Steuerdruckraum 52 von der Leitung 14 getrennt ist und in diesem nur der Druck des Speicherraums 56 herrscht. Wenn der im Druckraum 40 des Kraftstoffeinspritzventils 12 herrschende Druck eine die Kraft der Schließfeder 44 und die auf den Steuerkolben 50 wirkende Druckkraft übersteigende Kraft auf das Einspritzventilglied 28 erzeugt, so bewegt sich dieses in Öffnungsrichtung 29 und gibt die Einspritzöffnungen 32 frei. Below is the function of Fuel injection device according to the first Embodiment explained. During the suction stroke of the Pump piston 18 is the first control valve 58 in its open switching position, so that the connection of the Line 14 is opened with the storage space 56. The second Control valve 68 is in its closed Switching position, so the control pressure chamber 52 of the line 14th is disconnected. In the storage space 56 existing and under Pressure stored fuel is via the line 14 the Pump room 22 supplied until the storage space 56th is emptied. The pressure in the storage space 56 is here preferably higher than the pressure in the low pressure region of Fuel injector upstream of the Check valve 21 so that it is closed until the Storage space 56 is emptied. On further suction stroke becomes through the pump piston 18 when the check valve 21 is open Fuel sucked from the fuel tank 24. During the subsequent delivery stroke of the pump piston 18 closes the check valve 21 and the pump piston 18 promotes Fuel via line 14 to the fuel injection valve 12. During the delivery stroke of the pump piston 18, the first Control valve 58 to be in its open switching position, so that initially conveyed fuel in the storage space 56 will and will not be sufficient high pressure for a Fuel injection can build up. At the beginning of the Fuel injection then becomes the first control valve 58 by the controller 70 in its closed Switched position, so that the line 14 from Memory space 56 is disconnected. It can also be provided that the first control valve 58 during the delivery of the Pump piston 18 in its closed switching position is brought and the second control valve 68 in his opened switch position is brought. The control pressure chamber 52 is then connected to the line 14, so that in this there is an increased pressure, which via the control piston 50 the fuel injector 12 keeps closed. If the Fuel injection should start, so will the second Control valve 68 by the controller 70 in his closed switch position brought so that the Control pressure chamber 52 is separated from the line 14 and in this only the pressure of the storage space 56 prevails. If the in the pressure chamber 40 of the fuel injection valve 12th prevailing pressure a the force of the closing spring 44 and the on the control piston 50 acting pressure force exceeding Force generated on the injection valve member 28, so moved This is in the opening direction 29 and gives the Injection openings 32 free.

In Figur 2 ist der Verlauf des Druckes an den Einspritzöffnungen 32 des Kraftstoffeinspritzventils 12 über der Zeit während einem Einspritzzyklus dargestellt. Die vorstehend erläuterte Kraftstoffeinspritzung erfolgt bedingt durch das Profil des Nockens 20 mit relativ geringem Druck und geringer Einspritzmenge während einer in Figur 2 mit I bezeichneten Voreinspritzphase.In Figure 2, the course of the pressure at the Injection openings 32 of the fuel injection valve 12 via the time during an injection cycle. The above-explained fuel injection takes place conditionally by the profile of the cam 20 at a relatively low pressure and low injection quantity during one in Figure 2 with I designated pre-injection phase.

Zur Beendigung der Voreinspritzung wird durch die Steuereinrichtung 70 das erste Steuerventil 58 in seine geöffnete Schaltstellung gebracht, so daß der vom Pumpenkolben 18 geförderte Kraftstoff in den Speicherraum 56 gelangt und der Druck im Druckraum 40 derart abfällt, daß das Kraftstoffeinspritzventil 12 schließt. Alternativ kann das erste Steuerventil 58 auch in seiner geschlossenen Schaltstellung verbleiben, wobei durch die Steuereinrichtung 70 das zweite Steuerventil 68 in seine geöffnete Schaltstellung gebracht wird, so daß im Steuerdruckraum 52 Hochdruck herrscht, der über den Steuerkolben 50 das Kraftstoffeinspritzventil 12 schließt.To complete the pilot injection is by the Control device 70, the first control valve 58 in his opened switch position brought so that the from Pump piston 18 pumped fuel into the storage space 56th passes and the pressure in the pressure chamber 40 drops so that the fuel injection valve 12 closes. Alternatively, you can the first control valve 58 also in its closed Switching position remain, with the control device 70, the second control valve 68 in its open Switching position is brought, so that in the control pressure chamber 52nd High pressure prevails, the 50 via the control piston Fuel injector 12 closes.

Nachfolgend wird für eine Haupteinspritzung von Kraftstoff durch die Steuereinrichtung 70 das erste Steuerventil 58 in seine geschlossene Schaltstellung gebracht, so daß der Speicherraum 56 von der Leitung getrennt ist, und das zweite steuerventil 68 in seine geschlossene Schaltstellung gebracht, so daß der Steuerdruckraum 52 von der Leitung 14 getrennt ist. Im Druckraum 40 des Kraftstoffeinspritzventils 12 baut sich dann Hochdruck entsprechend dem Profil des Nockens 20 auf und das Kraftstoffeinspritzventil 12 öffnet, da der Steuerdruckraum 52 entlastet ist. Es erfolgt dann eine Einspritzung von Kraftstoff in einer in Figur 2 mit II bezeichneten Haupteinspritzphase. Durch den Zeitpunkt des Umschaltens des zweiten Steuerventils 68 in seine geschlossene Schaltstellung durch die Steuereinrichtung 70 kann der Zeitpunkt und damit der Druck beeinflußt werden, bei dem die Haupteinspritzung beginnt. Je später der Zeitpunkt ist, zu dem das zweite Steuerventil 68 geschlossen wird, desto höher ist der Druck, bei dem die Haupteinspritzung beginnt. Dies ist in Figur 2 durch einen gestrichelten Verlauf des Druckes verdeutlicht.The following is for a main injection of fuel by the controller 70, the first control valve 58 in brought his closed switching position, so that the Memory space 56 is disconnected from the line, and the second control valve 68 in its closed switching position brought so that the control pressure chamber 52 from the line 14th is disconnected. In the pressure chamber 40 of the fuel injection valve 12 then builds up high pressure according to the profile of Cam 20 and the fuel injector 12 opens, because the control pressure chamber 52 is relieved. It then happens an injection of fuel in a in Figure 2 with II designated main injection phase. By the time of Switching the second control valve 68 in his closed switching position by the controller 70th can the time and thus the pressure be influenced where the main injection starts. The later the Time is at which the second control valve 68 is closed is, the higher the pressure at which the Main injection begins. This is shown in FIG. 2 by a Dashed course of the pressure illustrates.

Zur Beendigung der Haupteinspritzung wird durch die Steuereinrichtung 70 das zweite Steuerventil 68 in seine geöffnete Schaltstellung gebracht, so daß das Kraftstoffeinspritzventil 12 durch den im Steuerdruckraum 52 herrschenden Hochdruck über den Steuerkolben 50 geschlossen wird. Im Druckraum 40 herrscht durch das in seiner geschlossenen Schaltstellung verbleibende erste Steuerventil 58 ebenfalls Hochdruck. Für eine Nacheinspritzung von Kraftstoff in einer in Figur 2 mit III bezeichneten Phase wird durch die Steuereinrichtung 70 das zweite Steuerventil 68 nochmals geschlossen, so daß der Steuerdruckraum 52 entlastet ist und das Kraftstoffeinspritzventil 12 öffnet. Zur Beendigung der Kraftstoffeinspritzung wird durch die Steuereinrichtung 70 das erste Steuerventil 58 in seine geöffnete Schaltstellung gebracht und das zweite Steuerventil 68 in seine geöffnete Schaltstellung gebracht oder in seiner geschlossenen Schaltstellung belassen.To complete the main injection is by the Control device 70, the second control valve 68 in his opened switch position brought so that the Fuel injection valve 12 through the control pressure chamber 52nd prevailing high pressure on the control piston 50 is closed becomes. In the pressure chamber 40 prevails by in his closed switching position remaining first control valve 58 also high pressure. For a post-injection of Fuel in a designated in Figure 2 with III phase by the controller 70, the second control valve 68 closed again, so that the control pressure chamber 52nd is relieved and the fuel injection valve 12 opens. To complete the fuel injection is by the Control device 70, the first control valve 58 in his opened switch position and the second Control valve 68 brought into its open switching position or left in its closed position.

Bei geöffnetem erstem Steuerventil 58 wird vom Pumpenkolben 18 bei dessen Förderhub geförderter Kraftstoff aus der Leitung 14 in den Speicherraum 56 abgesteuert. Mit zunehmendem in den Speicherraum gelangendem Kraftstoffvolumen bewegt sich der Speicherkolben 64 gegen die Kraft der Rückstellfeder 65 und der Druck im Speicherraum 56 erhöht sich. Wenn während der Kraftstoffeinspritzung nur eine geringe Kraftstoffmenge eingespritzt wird, was beispielsweise im Leerlauf der Brennkraftmaschine oder bei geringer Last der Fall ist, so wird in den Speicherraum 56 eine große Kraftstoffmenge abgesteuert und es stellt sich ein hoher Druck im Speicherraum 56 ein. Beim nachfolgenden Saughub des Pumpenkolbens 18 braucht dieser somit nur eine geringe Kraftstoffmenge aus dem Kraftstoffvorratsbehälter 24 anzusaugen. Wenn während der Kraftstoffeinspritzung eine große Kraftstoffmenge eingespritzt wird, was beispielsweise bei hoher Last der Brennkraftmaschine der Fall ist, so wird in den Speicherraum 56 nur eine geringe Kraftstoffmenge abgesteuert und es stellt sich ein relativ geringer Druck im Speicherraum 56 ein. Beim nachfolgenden Saughub des Pumpenkolbens 18 muß dieser somit eine große Kraftstoffmenge aus dem Kraftstoffvorratsbehälter 24 ansaugen.When the first control valve 58 is opened by the pump piston 18 at the delivery stroke funded fuel from the Line 14 diverted into the storage space 56. With getting into the storage room Fuel volume, the accumulator piston 64 moves against the force of the return spring 65 and the pressure in Storage space 56 increases. If during the Fuel injection only a small amount of fuel is injected, which, for example, at idle the Internal combustion engine or at low load is the case, so in the storage space 56, a large amount of fuel dislodged and it turns a high pressure in the Memory space 56 a. During the subsequent suction stroke of the Pump piston 18 thus needs this only a small Amount of fuel from the fuel tank 24th to suck. If during the fuel injection a large amount of fuel is injected, which for example at high load of the internal combustion engine is the case, it is in the storage space 56 only a small amount of fuel dislodged and there is a relatively low pressure in the Memory space 56 a. During the subsequent suction stroke of the Pump piston 18 thus this has a large amount of fuel from the fuel tank 24 suck.

In Figur 3 ist die Kraftstoffeinspritzeinrichtung gemäß einem zweiten Ausführungsbeispiel dargestellt, bei dem der grundsätzliche Aufbaue gleich wie beim ersten Ausführungsbeispiel ist und lediglich die Anordnung des zweiten Steuerventils 168 modifiziert ist. Das zweite Steuerventil 168 ist derart angeordnet, daß dieses den Durchgang durch den Kanal 62 vom Steuerdruckraum 52 in den Speicherraum 56 steuert. Der Steuerdruckraum 52 ist über den Kanal 60 mit der Drosselstelle 61 ständig mit der Leitung 14 verbunden. Das zweite Steuerventil 168 wird durch die Steuereinrichtung 70 bei der Kraftstoffeinspritzung umgekehrt gesteuert wie das Steuerventil 68 beim ersten Ausführungsbeispiel. Im Ausgangszustand ist das zweite Steuerventil 168 geöffnet, so daß der Steuerdruckraum 52 mit dem Speicherraum 56 verbunden ist. Wenn eine Kraftstoffeinspritzung erfolgen soll, so wird das zweite Steuerventil 168 durch die Steuereinrichtung 70 in seine geöffnete Schaltstellung gebracht. Zu einer Unterbrechung der Kraftstoffeinspritzung zwischen der Voreinspritzung und der Haupteinspritzung oder zwischen der Haupteinspritzung und der Nacheinspritzung wird das zweite Steuerventil 168 durch die Steuereinrichtung 70 in seine geschlossene Schaltstellung gebracht, so daß der Steuerdruckraum 52 vom Speicherraum 56 getrennt ist und in diesem Hochdruck herrscht.In Figure 3, the fuel injection device according to A second embodiment shown in which the basic setup same as the first Embodiment is and only the arrangement of second control valve 168 is modified. The second Control valve 168 is arranged such that this Passage through the channel 62 from the control pressure chamber 52 in the Memory space 56 controls. The control pressure chamber 52 is above the Channel 60 with the throttle body 61 constantly with the line 14th connected. The second control valve 168 is replaced by the Control device 70 in the fuel injection reversed controlled as the control valve 68 at the first Embodiment. In the initial state is the second Control valve 168 open, so that the control pressure chamber 52 with the storage space 56 is connected. When a Fuel injection is to take place, so will the second Control valve 168 by the controller 70 in his opened switch position brought. To an interruption the fuel injection between the pilot injection and the main injection or between the main injection and the post-injection becomes the second control valve 168 by the controller 70 in its closed Switched position brought so that the control pressure chamber 52 from Storage space 56 is disconnected and in this high pressure prevails.

Bei einer vereinfachten Ausführung der Kraftstoffeinspritzeinrichtung können das zweite Steuerventil 68 bzw. 168 sowie der Steuerkolben 50 und der Steuerdruckraum 52 entfallen und es ist nur das erste steuerventil 58 vorgesehen. In diesem Fall wird die Kraftstoffeinspritzung nur durch das erste Steuerventil 58 gesteuert, wobei sich beim Förderhub des Pumpenkolbens 18 bei geöffnetem Steuerventil 58 im Pumpenarbeitsraum 22, in der Leitung 14 und im Druckraum 40 kein Hochdruck aufbauen kann und somit keine Kraftstoffeinspritzung erfolgt. Bei geschlossenem Steuerventil 58 kann sich im Druckraum 40 Hochdruck aufbauen und das Kraftstoffeinspritzventil 12 öffnet, wenn die durch den Druck im Druckraum 40 auf das Einspritzventilglied 28 erzeugte Kraft in Öffnungsrichtung 29 größer ist als die Kraft der Schließfeder 44. Zur Unterbrechung oder Beendigung der Kraftstoffeinspritzung wird das Steuerventil 58 geöffnet, so daß der Druckraum 40 entlastet ist.In a simplified embodiment of the Fuel injector may be the second Control valve 68 or 168 and the control piston 50 and the Control pressure chamber 52 omitted and it is only the first control valve 58 is provided. In this case, the Fuel injection only by the first control valve 58th controlled, wherein during the delivery stroke of the pump piston 18th with open control valve 58 in the pump working chamber 22, in the line 14 and in the pressure chamber 40 do not build high pressure can and thus no fuel injection takes place. at closed control valve 58 may be in the pressure chamber 40th Build high pressure and the fuel injector 12th opens when the pressure in the pressure chamber 40 on the Injector member 28 generates force in the opening direction 29 is greater than the force of the closing spring 44. Zur Interruption or termination of fuel injection the control valve 58 is opened, so that the pressure chamber 40th is relieved.

Claims (7)

  1. Fuel injection apparatus for an internal combustion engine, having a high-pressure fuel pump (10) and a fuel injection valve (12), connected thereto, for each cylinder of the internal combustion engine, wherein the high-pressure fuel pump (10) has a pump piston (18) which is driven by the internal combustion engine in a reciprocating movement and which bounds a pump working space (22) which is connected via a line (14) to a pressure space (40) of the fuel injection valve (12) which is arranged separately from the high-pressure fuel pump (10) on the internal combustion engine and which has an injection valve element (28) by means of which at least one injection opening (32) is controlled and which can be moved, under loading by the pressure prevailing in the pressure space (40), counter to a closing force in the opening direction (29) in order to clear the at least one injection opening (32), wherein an electrically activated control valve (58) is provided, by means of which a connection (54) between the pump working space (22) and a relief space (56) is at least indirectly controlled, characterized in that the control valve (58) is arranged on the fuel injection valve (12) and in that an accumulator space (56), in which fuel which is released through the control valve (58) when said control valve (58) is opened, can be stored under pressure, is provided on the fuel injection valve (12) as a relief space.
  2. Fuel injection apparatus according to Claim 1, characterized in that the volume of the accumulator space (56) is at least as large as the volume fed through the pump piston (18) during a delivery stroke.
  3. Fuel injection apparatus according to Claim 1 or 2, characterized in that the accumulator space (56) has a resilient boundary (64).
  4. Fuel injection apparatus according to one of Claims 1 to 3, characterized in that a further electrically activated control valve (68; 168) is arranged on the fuel injection valve (12) and the pressure prevailing in a control pressure space (52) is controlled by means of said fuel injection valve (12), wherein the control pressure space (52) is bounded by a control piston (50) which acts on the injection valve element (28) in a closing direction under loading by the pressure prevailing in the control pressure space (52).
  5. Fuel injection apparatus according to Claim 4, characterized in that the further control valve (68) at least indirectly controls a connection (60) between the control pressure space (52) and the pump working space (22), and in that the control pressure space (52) has a continuously opened connection (62) to the accumulator space (56), wherein one throttle point (61; 63) is preferably provided in each of the connections (60; 62) of the control pressure space (52).
  6. Fuel injection apparatus according to Claim 4, characterized in that the further control valve (168) controls a connection (62) between the control pressure space (52) and the accumulator space (56), and in that the control pressure space (52) has a continuously opened connection (60) at least indirectly to the pump working space (22), wherein one throttle point (61; 63) is preferably provided in each of the connections (60; 62) of the control pressure space (52).
  7. Fuel injection apparatus according to one of the preceding claims, characterized in that the pump working space (22) at the high-pressure fuel pump (10) has a connection to a fuel reservoir container (24) via a low-pressure region, in which connection a non-return valve (21) which opens to the pump working space (22) is arranged.
EP02022358A 2001-11-14 2002-10-08 Fuel injection apparatus for an internal combustion engine Expired - Lifetime EP1312792B1 (en)

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DE10155973 2001-11-14
DE10155973A DE10155973A1 (en) 2001-11-14 2001-11-14 Fuel injection device for an internal combustion engine

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EP1312792A3 EP1312792A3 (en) 2004-09-01
EP1312792B1 true EP1312792B1 (en) 2005-12-28

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DE50205426D1 (en) 2006-02-02
EP1312792A3 (en) 2004-09-01
EP1312792A2 (en) 2003-05-21
US6763809B2 (en) 2004-07-20
DE10155973A1 (en) 2003-05-22

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