EP1260700B1 - Fuel injection system for internal combustion engine - Google Patents

Fuel injection system for internal combustion engine Download PDF

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Publication number
EP1260700B1
EP1260700B1 EP02008447A EP02008447A EP1260700B1 EP 1260700 B1 EP1260700 B1 EP 1260700B1 EP 02008447 A EP02008447 A EP 02008447A EP 02008447 A EP02008447 A EP 02008447A EP 1260700 B1 EP1260700 B1 EP 1260700B1
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EP
European Patent Office
Prior art keywords
valve
pressure
control valve
fuel
injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02008447A
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German (de)
French (fr)
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EP1260700A1 (en
Inventor
Nestor Rodriguez-Amaya
Roger Potschin
Juergen Gruen
Ulrich Projahn
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1260700A1 publication Critical patent/EP1260700A1/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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0059—Arrangements of valve actuators
    • F02M63/0061—Single actuator acting on two or more valve bodies
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • 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
    • 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
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F02M59/468—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means using piezoelectric operating means
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0049—Combined valve units, e.g. for controlling pumping chamber and injection valve
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to a fuel injection device for Internal combustion engine according to the preamble of claim 1.
  • Such a fuel injection device is described by DE 199 39 421 A known.
  • this fuel injection device is a common fuel pump for all cylinders of the internal combustion engine provided in the usual way by the internal combustion engine Having in a lifting movement driven pump piston, the one Pump work space limited to the fuel from one Fuel tank is supplied and the on a Distributor device on the cylinders of the internal combustion engine arranged fuel injection valves is connectable.
  • each Fuel injection valve has an injection valve member, is controlled by the at least one injection opening and the through the pressure space connectable to the pump working space of the fuel injection valve against a closing force in a Opening direction is movable. It is a first electric controlled control valve provided by a connection of the Pump work space is controlled with a discharge space.
  • a second electrically controlled control valve provided by the in a control pressure chamber of the Fuel injection valve is controlled by prevailing pressure the injection valve member at least indirectly in the closing direction is charged.
  • the third Control valve is a fuel injection, such as a Pre-injection and / or a post-injection, with a through the Pressure relief valve allows certain pressure level.
  • a separate actuator is required, causing the Structure of the fuel injection device is very expensive.
  • the fuel injection device according to the invention with the Features according to claim 1 has the advantage that the Structure of the fuel injection device is simplified as for the first and the third control valve requires only one actuator is.
  • FIG. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation according to a first Embodiment
  • Figure 2 shows a curve of a pressure Injection openings of a fuel injection valve of Fuel injection device
  • Figure 3 in part a modified version of Fuel injector.
  • FIG. 1 and 3 is a Fuel injection device for an internal combustion engine a motor vehicle shown.
  • the internal combustion engine is preferably a self-igniting internal combustion engine.
  • the Fuel injection device is preferably as trained so-called pump-line-nozzle system and has one for each cylinder of the internal combustion engine Fuel pump 10, a fuel injection valve 12 and a the fuel injection valve 12 with the Fuel pump 10 connecting line 14.
  • the Fuel pump 10 has one in a cylinder 16 tight guided pump piston 18, which by a cam 20 a camshaft of the internal combustion engine against the force a return spring 19 driven in a lifting movement becomes.
  • the pump piston 18 limited in the cylinder 16 a Pump work chamber 22, in which the delivery stroke of Pump piston 18 fuel is compressed under high pressure.
  • the pump working chamber 22 is by means of a feed pump 21st Fuel from a fuel tank 24 of the Motor vehicle supplied. Between the feed pump 21 and the pump working space 22 is a pump working space 22nd opening check valve 23 is arranged. In the line 14 may be another opening from the pump working chamber 22 Check valve 25 may be arranged. The delivery line 13 from the feed pump 21 opens between the pump working space 22 and the further check valve 25th
  • 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 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 one in the valve body 26 in the combustion chamber facing End region formed valve seat 36 cooperates, from or after which the injection openings 32 dissipate.
  • valve body 26 is between the injection valve member 28 and the bore 30 to the valve seat 36 toward an annular space 38th present, in its the valve seat 36 facing away End region by a radial extension of the bore 30 in a pressure chamber 40 surrounding the injection valve member 28 passes.
  • the injection valve member 28 has the height of the Pressure chamber 40 by a cross-sectional reduction a Pressure shoulder 42 on.
  • a biased Closing spring 44 At the end of the combustion chamber facing away from the Injector member 28 engages a biased 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.
  • a further bore 48 in which a Piston 50 is tightly guided, with the Injection valve member 28 is connected.
  • the piston 50 limited with its the injection valve member 28 facing away Front side a control pressure chamber 52 in the valve body 26.
  • Im Valve body 26, a channel 54 is formed, in which the Line 14 to the fuel pump 10 opens and in the Pressure chamber 40 opens.
  • the Fuel injector has a near the Fuel pump 10 arranged first control valve 60, for example, be integrated into the fuel pump 10 can.
  • first control valve 60 Through the first control valve 60 is a connection 59 of the pump working chamber 22 of the fuel pump 10 with controlled a discharge space, as the at least indirectly the fuel tank 24 may serve.
  • the connection 59 branches downstream of the check valve 25 of the Line 14 off.
  • the first control valve 60 may be pressure compensated or not be formed pressure balanced.
  • the first control valve 60 is formed as a 2/2-way valve and by this In a first switching position, the connection 59 to Relief space 24 opened and in a second Switching position is the connection 59 to the discharge space 24th separated.
  • a second control valve 68 is provided, through which a Connection 70 of the control pressure chamber 52 with a Relief space, such as the Fuel tank 24, is controlled.
  • the second Control valve 68 is electrically controllable and has a Actuator 69, which may be an electromagnet or a piezoelectric actuator can, by a control device 66 electrically is controlled and by a valve member of the Control valve 68 is movable.
  • the second control valve 68 is preferably formed pressure balanced.
  • the second Control valve 68 is designed as a 2/2-way valve, by the connection 70 in a first switching position the control pressure chamber 52 with the fuel tank 24th is separated and by that in a second switching position the connection 70 of the control pressure chamber 52 with the Fuel tank 24 is open.
  • a Throttle 58 In the connection 59 of the control pressure chamber 52 with the line 14 is a Throttle 58 and provided in the connection 70 of the Control pressure space 52 with the fuel tank 24 is between the control pressure chamber 52 and the second control valve 68 another throttle point 71 is provided.
  • the second Control valve 68 is also controlled by the controller 66 controlled.
  • the control of the control valves 60,68 through the controller 66 is dependent on Operating parameters of the internal combustion engine, such as For example, speed, load and temperature.
  • a third control valve 74 through the another connection 75 of the pump working space 22 is controlled with a discharge space, as the in turn, the fuel tank 24 may serve.
  • connection 75 is a to the fuel tank 24th opening pressure relief valve 76 arranged.
  • the Pressure relief valve 76 for example, by a closing spring 77 loaded valve member 78, the against the force of the closing spring 77 to Fuel tank 24 toward the opening direction is movable.
  • the pressure limiting valve 76 is preferably as shown in Figure 1 upstream of the third Control valve 74 disposed, wherein the third control valve 74th this does not need to be pressure balanced.
  • pressure relief valve 76 may also as in Figure 3 shown downstream of the third control valve 74th be arranged, in which case the third control valve 74th is preferably formed pressure balanced.
  • the third Control valve 74 is designed as a 2/2-way valve and by this is in a first switching position the Connection 75 to the relief space 24 is opened and in one second switching position, the connection 75 to Relief space 24 separated.
  • the first control valve 60 and the third control valve 74 are preferably by a common through the Control device 66 electrically actuated actuator 80th controlled.
  • the first control valve 60 and the third Control valve 74 may be disposed on the fuel pump 10 be.
  • the control valves 60,74 can, for example be arranged side by side.
  • the actuator 80 is the Controlled in a Aktor horrraum 82 prevailing pressure, wherein the actuator pressure chamber 82 with a hydraulic fluid, especially fuel is filled.
  • the actuator 80 is preferably designed as a piezoelectric actuator, depending on the height of an electrical voltage applied to this its length changes.
  • the two control valves 60, 74 have in each case a control valve member 62,86, the pressure in the Aktordruckraum 82 is acted upon and against the force of a Return spring 63,87 is movable.
  • the bias of Return spring 87 of the third control valve 74 is larger as the bias of the return spring 63 of the first Control valve 60.
  • the first control valve 60 and the third Control valve 74 is at low pressure in Aktordruckraum 82nd opened, so that both compounds 59 and 75 of Pump workspace 22 with the discharge chamber 24 is opened are.
  • the third control valve 74 switches to its closed position, so that the pump working space 22nd is completely separated from the relief space 24.
  • the first Control valve 60 remains in increasing the pressure in Actuator pressure chamber 82 in its closed position.
  • the pressure relief valve 76 opens and fuel flows through the opened third Control valve 74 and the connection 75 in the discharge space 24. Subsequently, the remains in the line 14 and the Pressure chamber 40 prevailing pressure at least approximately constant.
  • the opening pressure of the pressure relief valve 76 is through the bias of its closing spring 77 determined.
  • the Pre-injection takes place with a through the Pressure relief valve 76 limited pressure.
  • the second Control valve 68 is controlled by a corresponding control of the actuator 69 is opened, so that the control pressure chamber 52 with the discharge space 24 is connected.
  • the opened second control valve 68 may be in the control pressure chamber 52nd despite its connection 56 with the line 14 no increased Build up pressure, but this becomes the Fuel tank 24 reduced down.
  • the Throttle points 58 and 71 is achieved that from the channel 54th only a small amount of fuel in the Fuel tank 24 can drain.
  • the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the fuel tank 24 is separated and in the control pressure chamber 52 via the Compound 56 with the line 14 builds up an increased pressure.
  • a force of the closing spring 44th generates supportive force so that the Injection valve member 28 against its opening direction 29th moved and with its sealing surface 34 on the valve seat 36 to. Plant comes and the pre-injection is finished.
  • the first control valve 60 is opened be so that in the pump working chamber 22, the line 14th and the pressure chamber 40 can no longer build high pressure and the fuel injection valve 12 by the force of Closing spring 44 closes.
  • the second Control valve 68 opened by the controller 66, so that the control pressure chamber 52 is relieved again and the Fuel injection valve 12 opens.
  • the first control valve 60 is closed by the control device 66, so that the connection 59 of the pump working chamber 22 with the Relief space 24 is disconnected.
  • the third control valve 74 remains open at the beginning of the main injection, so that the connection 75 is open to the relief space 24 and in the conduit 14 and the pressure chamber 40 of the Fuel injection valve 12 by the Pressure relief valve 76 establishes predetermined pressure.
  • the Main injection then starts with a pressure level like also the pre-injection is done.
  • the main injection starts with a closed third control valve 74 with a higher pressure level than at first open third Control valve 74.
  • the third control valve 74 closed by the control device 66, so that the Compound 75 is separated with the discharge space 24 and the main injection continues with a pressure like he did according to the profile of the cam 20 in the pump working space 22 is generated. It can also be provided that first the third control valve 74 is closed, but that second control valve 68 still remains closed, so that still no injection takes place. The second control valve 68 is then only delayed opening, whereby the beginning of the Main injection is delayed and also the Main injection starts at a higher pressure.
  • the Main injection corresponds in Figure 2 one with II designated injection phase, wherein the pressure curve with shown by the solid line in the event that the third control valve 74 is opened at the beginning, and the Pressure curve with dashed line in case is shown that the third control valve 74 already closed Beginning is closed.
  • the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the fuel tank 24 is separated and in the control pressure chamber 52 by the Connection with the line 14 and thus the Pump work space 22 builds high pressure, through which the Fuel injection valve 12 is closed.
  • the first Control valve 60 and the third control valve 74 remain there closed so that the connections 59 and 75 to Relief space 24 are separated.
  • the second control valve 68 by the controller 66 opened again, so that the control pressure chamber 52 again is relieved and the fuel injection valve 12 opens.
  • the post-injection takes place with a pressure curve according to the profile of the cam 20.
  • the Post-injection corresponds to one in Figure 2 with III designated injection phase.

Description

Die Erfindung betrifft eine Kraftstoffeinspritzeinrichtung für Brennkraftmaschinen nach dem Oberbegriff des Anspruchs 1.The invention relates to a fuel injection device for Internal combustion engine according to the preamble of claim 1.

Eine solche Kraftstoffeinspritzeinrichtung ist durch die DE 199 39 421 A bekannt. Bei dieser Kraftstoffeinspritzeinrichtung ist eine gemeinsame Kraftstoffpumpe für alle Zylinder der Brennkraftmaschine vorgesehen, die in üblicher Weise einen durch die Brennkraftmaschine in einer Hubbewegung angetriebenen Pumpenkolben aufweist, der einen Pumpenarbeitsraum begrenzt, dem Kraftstoff aus einem Kraftstoffvorratsbehälter zugeführt wird und der über eine Verteilereinrichtung mit an den Zylindern der Brennkraftmaschine angeordneten Kraftstoffeinspritzventilen verbindbar ist. Jedes Kraftstoffeinspritzventil weist dabei ein Einspritzventilglied auf, durch das wenigstens eine Einspritzöffnung gesteuert wird und das durch den in einem mit dem Pumpenarbeitsraum verbindbaren Druckraum des Kraftstoffeinspritzventils gegen eine Schließkraft in einer Öffnungsrichtung bewegbar ist. Es ist ein erstes elektrisch gesteuertes Steuerventil vorgesehen, durch das eine Verbindung des Pumpenarbeitsraums mit einem Entlastungsraum gesteuert wird. Außerdem ist ein zweites elektrisch gesteuertes Steuerventil vorgesehen, durch das der in einem Steuerdruckraum des Kraftstoffeinspritzventils herrschende Druck gesteuert wird, durch den das Einspritzventilglied zumindest mittelbar in Schließrichtung beaufschlagt ist. Weiterhin ist ein drittes elektrisch gesteuertes Steuerventil vorgesehen, durch das eine Verbindung des Druckraums des Kraftstoffeinspritzventils mit einem Entlastungsraum gesteuert wird, wobei in dieser Verbindung ein zum Entlastungsraum hin öffnendes Druckbegrenzungsventil angeordnet ist. Durch das dritte Steuerventil ist eine Kraftstoffeinspritzung, beispielsweise eine Voreinspritzung und/oder eine Nacheinspritzung, mit einem durch das Druckbegrenzungsventil bestimmten Druckniveau ermöglicht. Nachteilig bei der bekannten Kraftstoffeinspritzeinrichtung ist, dass für jedes der Steuerventile ein eigener Aktor erforderlich ist, wodurch der Aufbau der Kraftstoffeinspritzeinrichtung sehr aufwendig ist. Such a fuel injection device is described by DE 199 39 421 A known. In this fuel injection device is a common fuel pump for all cylinders of the internal combustion engine provided in the usual way by the internal combustion engine Having in a lifting movement driven pump piston, the one Pump work space limited to the fuel from one Fuel tank is supplied and the on a Distributor device on the cylinders of the internal combustion engine arranged fuel injection valves is connectable. each Fuel injection valve has an injection valve member, is controlled by the at least one injection opening and the through the pressure space connectable to the pump working space of the fuel injection valve against a closing force in a Opening direction is movable. It is a first electric controlled control valve provided by a connection of the Pump work space is controlled with a discharge space. There is also a second electrically controlled control valve provided by the in a control pressure chamber of the Fuel injection valve is controlled by prevailing pressure the injection valve member at least indirectly in the closing direction is charged. Furthermore, a third is electrically controlled Control valve provided by the connection of the pressure chamber the fuel injection valve controlled with a discharge space is, in this connection to the relief space out opening pressure relief valve is arranged. By the third Control valve is a fuel injection, such as a Pre-injection and / or a post-injection, with a through the Pressure relief valve allows certain pressure level. adversely in the known fuel injector is that for each the control valves a separate actuator is required, causing the Structure of the fuel injection device is very expensive.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzeinrichtung mit den Merkmalen gemäß Anspruch 1 hat demgegenüber den Vorteil, dass der Aufbau der Kraftstoffeinspritzeinrichtung vereinfacht ist, da für das erste und das dritte Steuerventil nur ein Aktor erforderlich ist. The fuel injection device according to the invention with the Features according to claim 1 has the advantage that the Structure of the fuel injection device is simplified as for the first and the third control valve requires only one actuator is.

In den abhängigen Ansprüchen sind vorteilhafte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Kraftstoffeinspritzeinrichtung angegeben.In the dependent claims are advantageous Embodiments and developments of the invention Fuel injector specified.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine in schematischer Darstellung gemäß einer ersten Ausführungsform, Figur 2 einen Verlauf eines Druckes an Einspritzöffnungen eines Kraftstoffeinspritzventils der Kraftstoffeinspritzeinrichtung und Figur 3 ausschnittsweise eine modifizierte Ausführung der Kraftstoffeinspritzeinrichtung. An embodiment of the invention is in the drawing shown and in the following description in more detail explained. FIG. 1 shows a Fuel injection device for an internal combustion engine in a schematic representation according to a first Embodiment, Figure 2 shows a curve of a pressure Injection openings of a fuel injection valve of Fuel injection device and Figure 3 in part a modified version of Fuel injector.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In den Figuren 1 und 3 ist eine Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine eines Kraftfahrzeugs dargestellt. Die Brennkraftmaschine ist vorzugsweise eine selbstzündende Brennkraftmaschine. Die Kraftstoffeinspritzeinrichtung ist vorzugsweise 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 einem Zylinder 16 dicht geführten Pumpenkolben 18 auf, der durch einen Nocken 20 einer Nockenwelle der Brennkraftmaschine entgegen der Kraft einer Rückstellfeder 19 in einer Hubbewegung angetrieben wird. Der Pumpenkolben 18 begrenzt im Zylinder 16 einen Pumpenarbeitsraum 22, in dem beim Förderhub des Pumpenkolbens 18 Kraftstoff unter Hochdruck verdichtet wird. Dem Pumpenarbeitsraum 22 wird mittels einer Förderpumpe 21 Kraftstoff aus einem Kraftstoffvorratsbehälter 24 des Kraftfahrzeugs zugeführt. Zwischen der Förderpumpe 21 und dem Pumpenarbeitsraum 22 ist ein zum Pumpenarbeitsraum 22 öffnendes Rückschlagventil 23 angeordnet. In der Leitung 14 kann ein aus dem Pumpenarbeitsraum 22 öffnendes weiteres Rückschlagventil 25 angeordnet sein. Die Förderleitung 13 von der Förderpumpe 21 mündet zwischen dem Pumpenarbeitsraum 22 und dem weiteren Rückschlagventil 25.In Figures 1 and 3 is a Fuel injection device for an internal combustion engine a motor vehicle shown. The internal combustion engine is preferably a self-igniting internal combustion engine. The Fuel injection device is preferably as trained so-called pump-line-nozzle system and has one for each cylinder of the internal combustion engine Fuel pump 10, a fuel injection valve 12 and a the fuel injection valve 12 with the Fuel pump 10 connecting line 14. The Fuel pump 10 has one in a cylinder 16 tight guided pump piston 18, which by a cam 20 a camshaft of the internal combustion engine against the force a return spring 19 driven in a lifting movement becomes. The pump piston 18 limited in the cylinder 16 a Pump work chamber 22, in which the delivery stroke of Pump piston 18 fuel is compressed under high pressure. The pump working chamber 22 is by means of a feed pump 21st Fuel from a fuel tank 24 of the Motor vehicle supplied. Between the feed pump 21 and the pump working space 22 is a pump working space 22nd opening check valve 23 is arranged. In the line 14 may be another opening from the pump working chamber 22 Check valve 25 may be arranged. The delivery line 13 from the feed pump 21 opens between the pump working space 22 and the further check valve 25th

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 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 in dessen dem Brennraum zugewandtem Endbereich 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 in seinem dem Ventilsitz 36 abgewandten Endbereich durch eine radiale Erweiterung der Bohrung 30 in einen das Einspritzventilglied 28 umgebenden Druckraum 40 übergeht. Das Einspritzventilglied 28 weist auf Höhe des Druckraums 40 durch eine Querschnittsverringerung 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 schließt sich an dessen der Bohrung 30 abgewandtem Ende im Ventilkörper 26 eine weitere Bohrung 48 an, in der ein Kolben 50 dicht geführt ist, der mit dem Einspritzventilglied 28 verbunden ist. Der Kolben 50 begrenzt mit seiner dem Einspritzventilglied 28 abgewandten Stirnseite einen Steuerdruckraum 52 im Ventilkörper 26. Im Ventilkörper 26 ist ein Kanal 54 ausgebildet, in den die Leitung 14 zur Kraftstoffpumpe 10 mündet und der in den Druckraum 40 mündet.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 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 one in the valve body 26 in the combustion chamber facing End region formed valve seat 36 cooperates, from or after which the injection openings 32 dissipate. in the Valve body 26 is between the injection valve member 28 and the bore 30 to the valve seat 36 toward an annular space 38th present, in its the valve seat 36 facing away End region by a radial extension of the bore 30 in a pressure chamber 40 surrounding the injection valve member 28 passes. The injection valve member 28 has the height of the Pressure chamber 40 by a cross-sectional reduction a Pressure shoulder 42 on. At the end of the combustion chamber facing away from the Injector member 28 engages a biased 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 closes at the bore 30 facing away from the end in Valve body 26 a further bore 48, in which a Piston 50 is tightly guided, with the Injection valve member 28 is connected. The piston 50 limited with its the injection valve member 28 facing away Front side a control pressure chamber 52 in the valve body 26. Im Valve body 26, a channel 54 is formed, in which the Line 14 to the fuel pump 10 opens and in the Pressure chamber 40 opens.

Vom Kanal 54 des Kraftstoffeinspritzventils 12 zweigt eine Verbindung 56 zum Steuerdruckraum 52 ab. Die Kraftstoffeinspritzeinrichtung weist ein nahe der Kraftstoffpumpe 10 angeordnetes erstes Steuerventil 60 auf, das beispielsweise in die Kraftstoffpumpe 10 integriert sein kann. Durch das erste Steuerventil 60 wird eine Verbindung 59 des Pumpenarbeitsraums 22 der Kraftstoffpumpe 10 mit einem Entlastungsraum gesteuert, als der zumindest mittelbar der Kraftstoffvorratsbehälter 24 dienen kann. Die Verbindung 59 zweigt stromabwärts des Rückschlagventils 25 von der Leitung 14 ab.From the channel 54 of the fuel injection valve 12 branches one Connection 56 to the control pressure chamber 52 from. The Fuel injector has a near the Fuel pump 10 arranged first control valve 60, for example, be integrated into the fuel pump 10 can. Through the first control valve 60 is a connection 59 of the pump working chamber 22 of the fuel pump 10 with controlled a discharge space, as the at least indirectly the fuel tank 24 may serve. The connection 59 branches downstream of the check valve 25 of the Line 14 off.

Das erste Steuerventil 60 kann druckausgeglichen oder nicht druckausgeglichen ausgebildet sein. Das erste Steuerventil 60 ist als ein 2/2-Wegeventil ausgebildet und durch dieses wird in einer ersten Schaltstellung die Verbindung 59 zum Entlastungsraum 24 geöffnet und in einer zweiten Schaltstellung wird die Verbindung 59 zum Entlastungsraum 24 getrennt.The first control valve 60 may be pressure compensated or not be formed pressure balanced. The first control valve 60 is formed as a 2/2-way valve and by this In a first switching position, the connection 59 to Relief space 24 opened and in a second Switching position is the connection 59 to the discharge space 24th separated.

Zur Steuerung des Druckes im Steuerdruckraum 52 ist ein zweites Steuerventil 68 vorgesehen, durch das eine Verbindung 70 des Steuerdruckraums 52 mit einem Entlastungsraum, beispielsweise dem Kraftstoffvorratsbehälter 24, gesteuert wird. Das zweite Steuerventil 68 ist elektrisch steuerbar und weist einen Aktor 69 auf, der ein Elektromagnet oder ein Piezoaktor sein kann, der durch eine Steuereinrichtung 66 elektrisch angesteuert wird und durch den ein Ventilglied des Steuerventils 68 bewegbar ist. Das zweite Steuerventil 68 ist vorzugsweise druckausgeglichen ausgebildet. Das zweite Steuerventil 68 ist als ein 2/2-Wegeventil ausgebildet, durch das in einer ersten Schaltstellung die Verbindung 70 des Steuerdruckraums 52 mit dem Kraftstoffvorratsbehälter 24 getrennt ist und durch das in einer zweiten Schaltstellung die Verbindung 70 des Steuerdruckraums 52 mit dem Kraftstoffvorratsbehälter 24 geöffnet ist. In der Verbindung 59 des Steuerdruckraums 52 mit der Leitung 14 ist eine Drosselstelle 58 vorgesehen und in der Verbindung 70 des Steuerdruckraums 52 mit dem Kraftstoffvorratsbehälter 24 ist zwischen dem Steuerdruckraum 52 und dem zweiten Steuerventil 68 eine weitere Drosselstelle 71 vorgesehen. Das zweite Steuerventil 68 wird ebenfalls durch die Steuereinrichtung 66 gesteuert. Die Steuerung der Steuerventile 60,68 durch die Steuereinrichtung 66 erfolgt abhängig von Betriebsparametern der Brennkraftmaschine, wie beispielsweise Drehzahl, Last und Temperatur.To control the pressure in the control pressure chamber 52 is a second control valve 68 is provided, through which a Connection 70 of the control pressure chamber 52 with a Relief space, such as the Fuel tank 24, is controlled. The second Control valve 68 is electrically controllable and has a Actuator 69, which may be an electromagnet or a piezoelectric actuator can, by a control device 66 electrically is controlled and by a valve member of the Control valve 68 is movable. The second control valve 68 is preferably formed pressure balanced. The second Control valve 68 is designed as a 2/2-way valve, by the connection 70 in a first switching position the control pressure chamber 52 with the fuel tank 24th is separated and by that in a second switching position the connection 70 of the control pressure chamber 52 with the Fuel tank 24 is open. In the connection 59 of the control pressure chamber 52 with the line 14 is a Throttle 58 and provided in the connection 70 of the Control pressure space 52 with the fuel tank 24 is between the control pressure chamber 52 and the second control valve 68 another throttle point 71 is provided. The second Control valve 68 is also controlled by the controller 66 controlled. The control of the control valves 60,68 through the controller 66 is dependent on Operating parameters of the internal combustion engine, such as For example, speed, load and temperature.

Es ist außerdem ein drittes Steuerventil 74 vorgesehen, durch das eine weitere Verbindung 75 des Pumpenarbeitsraums 22 mit einem Entlastungsraum gesteuert wird, als der wiederum der Kraftstoffvorratsbehälter 24 dienen kann. In der Verbindung 75 ist ein zum Kraftstoffvorratsbehälter 24 hin öffnendes Druckbegrenzungsventil 76 angeordnet. Das Druckbegrenzungsventil 76 weist beispielsweise ein durch eine Schließfeder 77 belastetes Ventilglied 78 auf, das gegen die Kraft der Schließfeder 77 zum Kraftstoffvorratsbehälter 24 hin in Öffnungsrichtung bewegbar ist. Das Druckbegrenzungsventil 76 ist vorzugsweise wie in Figur 1 dargestellt stromaufwärts vor dem dritten Steuerventil 74 angeordnet, wobei das dritte Steuerventil 74 hierbei nicht druckausgeglichen zu sein braucht. Das Druckbegrenzungsventil 76 kann jedoch auch wie in Figur 3 dargestellt stromabwärts nach dem dritten Steuerventil 74 angeordnet sein, wobei dann das dritte Steuerventil 74 vorzugsweise druckausgeglichen ausgebildet ist. Das dritte Steuerventil 74 ist als ein 2/2-Wegeventil ausgebildet und durch dieses wird in einer ersten Schaltstellung die Verbindung 75 zum Entlastungsraum 24 geöffnet und in einer zweiten Schaltstellung wird die Verbindung 75 zum Entlastungsraum 24 getrennt. There is also provided a third control valve 74, through the another connection 75 of the pump working space 22 is controlled with a discharge space, as the in turn, the fuel tank 24 may serve. In the connection 75 is a to the fuel tank 24th opening pressure relief valve 76 arranged. The Pressure relief valve 76, for example, by a closing spring 77 loaded valve member 78, the against the force of the closing spring 77 to Fuel tank 24 toward the opening direction is movable. The pressure limiting valve 76 is preferably as shown in Figure 1 upstream of the third Control valve 74 disposed, wherein the third control valve 74th this does not need to be pressure balanced. The However, pressure relief valve 76 may also as in Figure 3 shown downstream of the third control valve 74th be arranged, in which case the third control valve 74th is preferably formed pressure balanced. The third Control valve 74 is designed as a 2/2-way valve and by this is in a first switching position the Connection 75 to the relief space 24 is opened and in one second switching position, the connection 75 to Relief space 24 separated.

Das erste Steuerventil 60 und das dritte Steuerventil 74 werden vorzugsweise durch einen gemeinsamen durch die Steuereinrichtung 66 elektrisch angesteuerten Aktor 80 gesteuert. Das erste Steuerventil 60 und das dritte Steuerventil 74 können an der Kraftstoffpumpe 10 angeordnet sein. Die Steuerventile 60,74 können beispielsweise nebeneinander angeordnet sein. Durch den Aktor 80 wird der in einem Aktordruckraum 82 herrschende Druck gesteuert, wobei der Aktordruckraum 82 mit einer Hydraulikflüssigkeit, insbesondere Kraftstoff gefüllt ist. Der Aktor 80 ist vorzugsweise als Piezoaktor ausgebildet, der abhängig von der Höhe einer an diesen angelegten elektrischen Spannung seine Länge ändert. Die beiden Steuerventile 60, 74 weisen jeweils ein Steuerventilglied 62,86 auf, das vom Druck im Aktordruckraum 82 beaufschlagt ist und gegen die Kraft einer Rückstellfeder 63,87 bewegbar ist. Die Vorspannung der Rückstellfeder 87 des dritten Steuerventils 74 ist größer als die Vorspannung der Rückstellfeder 63 des ersten Steuerventils 60. Das erste Steuerventil 60 und das dritte Steuerventil 74 ist bei geringem Druck im Aktordruckraum 82 geöffnet, so daß beide Verbindungen 59 und 75 des Pumpenarbeitsraums 22 mit dem Entlastungsraum 24 geöffnet sind. Wenn der Druck im Aktordruckraum 82 durch entsprechende Ansteuerung des Aktors 80 durch die Steuereinrichtung 66 auf ein erstes Druckniveau erhöht wird, so schaltet das erste Steuerventil 60 wegen der geringeren Vorspannung von dessen Rückstellfeder 63 in seine geschlossene Stellung, so daß die Verbindung 59 des Pumpenarbeitsraums 22 mit dem Entlastungsraum 24 getrennt ist. Das dritte Steuerventil 74 bleibt bei diesem Druckniveau jedoch wegen der höheren Vorspannung von dessen Rückstellfeder 87 noch in seiner geöffneten Stellung, so daß der Pumpenarbeitsraum 22 bei Überschreiten des durch das Druckbegrenzungsventil 76 eingestellten Drucks über die geöffnete Verbindung 75 mit dem Entlastungsraum 24 verbunden ist. Erst wenn der Druck im Aktordruckraum 82 durch entsprechende Ansteuerung des Aktors 80 durch die Steuereinrichtung 66 weiter auf ein zweites Druckniveau erhöht wird, schaltet das dritte Steuerventil 74 in seine geschlossene Stellung um, so daß der Pumpenarbeitsraum 22 vom Entlastungsraum 24 ganz getrennt ist. Das erste Steuerventil 60 bleibt bei Erhöhung des Drucks im Aktordruckraum 82 in seiner geschlossenen Stellung.The first control valve 60 and the third control valve 74 are preferably by a common through the Control device 66 electrically actuated actuator 80th controlled. The first control valve 60 and the third Control valve 74 may be disposed on the fuel pump 10 be. The control valves 60,74 can, for example be arranged side by side. By the actuator 80 is the Controlled in a Aktordruckraum 82 prevailing pressure, wherein the actuator pressure chamber 82 with a hydraulic fluid, especially fuel is filled. The actuator 80 is preferably designed as a piezoelectric actuator, depending on the height of an electrical voltage applied to this its length changes. The two control valves 60, 74 have in each case a control valve member 62,86, the pressure in the Aktordruckraum 82 is acted upon and against the force of a Return spring 63,87 is movable. The bias of Return spring 87 of the third control valve 74 is larger as the bias of the return spring 63 of the first Control valve 60. The first control valve 60 and the third Control valve 74 is at low pressure in Aktordruckraum 82nd opened, so that both compounds 59 and 75 of Pump workspace 22 with the discharge chamber 24 is opened are. When the pressure in Aktordruckraum 82 by corresponding control of the actuator 80 by the Controller 66 is raised to a first pressure level, so the first control valve 60 switches because of the lower Bias of its return spring 63 in his closed position, so that the connection 59 of the Pump workspace 22 with the discharge chamber 24 separately is. The third control valve 74 remains at this Pressure level, however, because of the higher bias of the Return spring 87 still in its open position, so that the pump working chamber 22 when exceeding by the Pressure relief valve 76 set pressure on the opened connection 75 connected to the discharge chamber 24 is. Only when the pressure in the actuator pressure chamber 82 through corresponding control of the actuator 80 by the Control device 66 further to a second pressure level is increased, the third control valve 74 switches to its closed position, so that the pump working space 22nd is completely separated from the relief space 24. The first Control valve 60 remains in increasing the pressure in Actuator pressure chamber 82 in its closed position.

Nachfolgend wird die Funktion der Kraftstoffeinspritzeinrichtung erläutert. Beim Saughub des Pumpenkolbens 18 wird durch die Förderpumpe 21 Kraftstoff aus dem Kraftstoffvorratsbehälter 24 durch das geöffnete Rückschlagventil 23 über die Leitung 13 in den Pumpenarbeitsraum 22 gefördert. Beim Förderhub des Pumpenkolbens 18 schließt das Rückschlagventil 23 und das Rückschlagventil 25 öffnet, wobei das erste Steuerventil 60 geöffnet ist, so daß die Verbindung 59 mit dem Entlastungsraum 24 geöffnet ist. Die Kraftstoffeinspritzung beginnt mit einer Voreinspritzung, wobei das erste Steuerventil 60 geschlossen wird, indem der Aktor 80 durch die Steuereinrichtung 66 derart angesteuert wird, daß der Druck im Aktordruckraum 82 auf das erste Druckniveau ansteigt und das erste Steuerventil 60 in seine geschlossene Stellung umschaltet und die Verbindung 59 zum Entlastungsraum 24 getrennt ist. Das dritte Steuerventil 74 verbleibt in seiner geöffneten Stellung. Im Pumpenarbeitsraum 22 und in der Leitung 14 sowie im Druckraum 40 des Kraftstoffeinspritzventils 12 kann sich somit nur ein Druck aufbauen, wie er durch das Druckbegrenzungsventil 76 eingestellt wird. Wenn der durch das Druckbegrenzungsventil 76 eingestellte Druck überschritten wird, so öffnet das Druckbegrenzungsventil 76 und Kraftstoff strömt durch das geöffnete dritte Steuerventil 74 und die Verbindung 75 in den Entlastungsraum 24. Nachfolgend bleibt der in der Leitung 14 und dem Druckraum 40 herrschende Druck zumindest annähernd konstant. Der Öffnungsdruck des Druckbegrenzungsventils 76 wird durch die Vorspannung von dessen Schließfeder 77 bestimmt. Die Voreinspritzung erfolgt mit einem durch das Druckbegrenzungsventil 76 begrenzten Druck. Das zweite Steuerventil 68 wird durch eine entsprechende Ansteuerung des Aktors 69 geöffnet, so daß der Steuerdruckraum 52 mit dem Entlastungsraum 24 verbunden ist. Infolge des geöffneten zweiten Steuerventils 68 kann sich im Steuerdruckraum 52 trotz dessen Verbindung 56 mit der Leitung 14 kein erhöhter Druck aufbauen, sondern dieser wird zum Kraftstoffvorratsbehälter 24 hin abgebaut. Durch die Drosselstellen 58 und 71 wird erreicht, daß aus dem Kanal 54 nur eine geringe Kraftstoffmenge in den Kraftstoffvorratsbehälter 24 abfließen kann. Wenn der im Druckraum 40 herrschende Druck eine derartige Höhe erreicht hat, daß dieser über die Druckschulter 42 auf das Einspritzventilglied 28 eine in Öffnungsrichtung 29 wirkende Kraft ausübt, die größer ist als die Kraft der Schließfeder 44 und die durch den im Steuerdruckraum 52 herrschenden Restdruck auf den Kolben 50 ausgeübte Kraft, so hebt das Einspritzventilglied 28 mit seiner Dichtfläche 34 vom Ventilsitz 36 ab und Kraftstoff wird durch die Einspritzöffnungen 32 in den Brennraum des Zylinders der Brennkraftmaschine eingespritzt. Der Öffnungsdruck des Kraftstoffeinspritzventils 12 ist dabei wegen dem geöffneten zweiten Steuerventil 68 nur von der Kraft der Schließfeder 44 und der durch den im Steuerdruckraum 52 herrschenden Restdruck auf den Kolben 50 ausgeübten Kraft abhängig.Below is the function of Fuel injection device explained. During the suction stroke of the Pump piston 18 is fuel through the feed pump 21 from the fuel tank 24 through the open Check valve 23 via the line 13 in the Pump working space 22 promoted. During the delivery stroke of the Pump piston 18 closes the check valve 23 and the Check valve 25 opens, wherein the first control valve 60th is open, so that the connection 59 with the Relief space 24 is open. The fuel injection begins with a pre-injection, the first Control valve 60 is closed by the actuator 80 through the control device 66 is controlled such that the Pressure in Aktordruckraum 82 to the first pressure level rises and the first control valve 60 in its closed Switching position and the connection 59 to Relief space 24 is disconnected. The third control valve 74 remains in its open position. in the Pump work chamber 22 and in the line 14 and in Pressure chamber 40 of the fuel injection valve 12 may be thus only build up a pressure, as he through the Pressure relief valve 76 is set. When the through the pressure relief valve 76 set pressure is exceeded, the pressure relief valve 76 opens and fuel flows through the opened third Control valve 74 and the connection 75 in the discharge space 24. Subsequently, the remains in the line 14 and the Pressure chamber 40 prevailing pressure at least approximately constant. The opening pressure of the pressure relief valve 76 is through the bias of its closing spring 77 determined. The Pre-injection takes place with a through the Pressure relief valve 76 limited pressure. The second Control valve 68 is controlled by a corresponding control of the actuator 69 is opened, so that the control pressure chamber 52 with the discharge space 24 is connected. As a result of the opened second control valve 68 may be in the control pressure chamber 52nd despite its connection 56 with the line 14 no increased Build up pressure, but this becomes the Fuel tank 24 reduced down. By the Throttle points 58 and 71 is achieved that from the channel 54th only a small amount of fuel in the Fuel tank 24 can drain. If the im Pressure chamber 40 prevailing pressure reaches such a height has that this on the pressure shoulder 42 on the Injection valve member 28 acting in the opening direction 29 Exerts force that is greater than the force of the closing spring 44 and by the prevailing in the control pressure chamber 52 Residual pressure on the piston 50 force applied, so that lifts Injection valve member 28 with its sealing surface 34 from Valve seat 36 and fuel is through the Injection openings 32 in the combustion chamber of the cylinder Internal combustion engine injected. The opening pressure of the Fuel injection valve 12 is because of the open second control valve 68 only by the force of the closing spring 44 and by the ruling in the control pressure chamber 52 Residual pressure on the piston 50 force applied.

In Figur 2 ist der Verlauf des Druckes p an den Einspritzöffnungen 32 des Kraftstoffeinspritzventils 12 über der Zeit t während einem Einspritzzyklus dargestellt. Die Voreinspritzung entspricht dabei einer in Figur 2 mit I bezeichneten Einspritzphase.In Figure 2, the course of the pressure p to the Injection openings 32 of the fuel injection valve 12 via time t during an injection cycle. The Pre-injection corresponds to one in Figure 2 with I designated injection phase.

Zur Beendigung der Voreinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 geschlossen, so daß der Steuerdruckraum 52 vom Kraftstoffvorratsbehälter 24 getrennt ist und sich im Steuerdruckraum 52 über dessen Verbindung 56 mit der Leitung 14 ein erhöhter Druck aufbaut. Hierdurch wird über den Kolben 50 auf das Einspritzventilglied 28 eine die Kraft der Schließfeder 44 unterstützende Kraft erzeugt, so daß das Einspritzventilglied 28 entgegen seiner Öffnungsrichtung 29 bewegt und mit seiner Dichtfläche 34 am Ventilsitz 36 zur. Anlage kommt und die Voreinspritzung beendet wird. Alternativ oder zusätzlich kann zur Beendigung der Voreinspritzung auch das erste Steuerventil 60 geöffnet werden, so daß sich im Pumpenarbeitsraum 22, der Leitung 14 und dem Druckraum 40 kein Hochdruck mehr aufbauen kann und das Kraftstoffeinspritzventil 12 durch die Kraft der Schließfeder 44 schließt.To end the pilot injection, the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the fuel tank 24 is separated and in the control pressure chamber 52 via the Compound 56 with the line 14 builds up an increased pressure. This is on the piston 50 on the Injector member 28, a force of the closing spring 44th generates supportive force so that the Injection valve member 28 against its opening direction 29th moved and with its sealing surface 34 on the valve seat 36 to. Plant comes and the pre-injection is finished. Alternatively or additionally, to terminate the Pre-injection and the first control valve 60 is opened be so that in the pump working chamber 22, the line 14th and the pressure chamber 40 can no longer build high pressure and the fuel injection valve 12 by the force of Closing spring 44 closes.

Für eine nachfolgende Haupteinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 geöffnet, so daß der Steuerdruckraum 52 wieder entlastet ist und das Kraftstoffeinspritzventil 12 öffnet. Das erste Steuerventil 60 wird durch die Steuereinrichtung 66 geschlossen, so daß die Verbindung 59 des Pumpenarbeitsraums 22 mit dem Entlastungsraum 24 getrennt ist. Das dritte Steuerventil 74 bleibt beim Beginn der Haupteinspritzung geöffnet, so daß die Verbindung 75 zum Entlastungsraum 24 geöffnet ist und sich in der Leitung 14 und dem Druckraum 40 des Kraftstoffeinspritzventils 12 der durch das Druckbegrenzungsventil 76 vorgegebene Druck aufbaut. Die Haupteinspritzung beginnt dann mit einem Druckniveau wie auch die Voreinspritzung erfolgt ist. Die Haupteinspritzung beginnt bei geschlossenem drittem Steuerventil 74 mit einem höheren Druckniveau als bei zunächst geöffnetem drittem Steuerventil 74. Anschließend wird das dritte Steuerventil 74 durch die Steuereinrichtung 66 geschlossen, so daß die Verbindung 75 mit dem Entlastungsraum 24 getrennt ist und die Haupteinspritzung erfolgt weiter mit einem Druck, wie er entsprechend dem Profil des Nockens 20 im Pumpenarbeitsraum 22 erzeugt wird. Es kann auch vorgesehen sein, daß zunächst das dritte Steuerventil 74 geschlossen wird, jedoch das zweite Steuerventil 68 noch geschlossen bleibt, so daß noch keine Einspritzung erfolgt. Das zweite Steuerventil 68 wird dann erst verzögert geöffnet, wodurch der Beginn der Haupteinspritzung verzögert wird und außerdem die Haupteinspritzung bei einem höheren Druck beginnt. Die Haupteinspritzung entspricht in Figur 2 einer mit II bezeichneten Einspritzphase, wobei der Druckverlauf mit durchgezogener Linie für den Fall dargestellt ist, daß das dritte Steuerventil 74 zu Beginn geöffnet ist, und der Druckverlauf mit gestrichelter Linie für den Fall dargestellt ist, daß das dritte Steuerventil 74 schon zu Beginn geschlossen ist.For a subsequent main injection, the second Control valve 68 opened by the controller 66, so that the control pressure chamber 52 is relieved again and the Fuel injection valve 12 opens. The first control valve 60 is closed by the control device 66, so that the connection 59 of the pump working chamber 22 with the Relief space 24 is disconnected. The third control valve 74 remains open at the beginning of the main injection, so that the connection 75 is open to the relief space 24 and in the conduit 14 and the pressure chamber 40 of the Fuel injection valve 12 by the Pressure relief valve 76 establishes predetermined pressure. The Main injection then starts with a pressure level like also the pre-injection is done. The main injection starts with a closed third control valve 74 with a higher pressure level than at first open third Control valve 74. Subsequently, the third control valve 74 closed by the control device 66, so that the Compound 75 is separated with the discharge space 24 and the main injection continues with a pressure like he did according to the profile of the cam 20 in the pump working space 22 is generated. It can also be provided that first the third control valve 74 is closed, but that second control valve 68 still remains closed, so that still no injection takes place. The second control valve 68 is then only delayed opening, whereby the beginning of the Main injection is delayed and also the Main injection starts at a higher pressure. The Main injection corresponds in Figure 2 one with II designated injection phase, wherein the pressure curve with shown by the solid line in the event that the third control valve 74 is opened at the beginning, and the Pressure curve with dashed line in case is shown that the third control valve 74 already closed Beginning is closed.

Zur Beendigung der Haupteinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 geschlossen, so daß der Steuerdruckraum 52 vom Kraftstoffvorratsbehälter 24 getrennt ist und sich im Steuerdruckraum 52 durch dessen Verbindung mit der Leitung 14 und damit dem Pumpenarbeitsraum 22 Hochdruck aufbaut, durch den das Kraftstoffeinspritzventil 12 geschlossen wird. Das erste Steuerventil 60 und das dritte Steuerventil 74 bleiben dabei geschlossen, so daß die Verbindungen 59 und 75 zum Entlastungsraum 24 getrennt sind. Für eine Nacheinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 nochmals geöffnet, so daß der Steuerdruckraum 52 wieder entlastet ist und das Kraftstoffeinspritzventil 12 öffnet. To finish the main injection, the second Control valve 68 closed by the control device 66, so that the control pressure chamber 52 from the fuel tank 24 is separated and in the control pressure chamber 52 by the Connection with the line 14 and thus the Pump work space 22 builds high pressure, through which the Fuel injection valve 12 is closed. The first Control valve 60 and the third control valve 74 remain there closed so that the connections 59 and 75 to Relief space 24 are separated. For a post-injection becomes the second control valve 68 by the controller 66 opened again, so that the control pressure chamber 52 again is relieved and the fuel injection valve 12 opens.

Die Nacheinspritzung erfolgt mit einem Druckverlauf entsprechend dem Profil des Nockens 20. Zur Beendigung der Nacheinspritzung wird das zweite Steuerventil 68 durch die Steuereinrichtung 66 geschlossen und/oder das erste Steuerventil 60 durch die Steuereinrichtung 66 geöffnet. Die Nacheinspritzung entspricht einer in Figur 2 mit III bezeichneten Einspritzphase.The post-injection takes place with a pressure curve according to the profile of the cam 20. To terminate the Nacheinspritzung the second control valve 68 through the Control device 66 closed and / or the first Control valve 60 opened by the controller 66. The Post-injection corresponds to one in Figure 2 with III designated injection phase.

Claims (3)

  1. Fuel injection device for internal combustion engines, with at least one fuel pump (10) which has a pump piston (18) which is driven in a lifting movement by the internal combustion engine and which delimits a pump working space (22), to which fuel is supplied from the fuel storage tank (24) and which is connected to a fuel injection valve (12) having an injection-valve member (28), by means of which at least one injection orifice (32) is controlled and which can be moved in an opening direction (29), counter to a closing force, by the pressure prevailing in a pressure space (40) connected to the pump working space (22), with a first electrically controlled control valve (60), by means of which a connection (59) of the pump working space (22) with a relief space (24) is controlled, with a second electrically controlled control valve (68), by means of which is controlled the pressure which prevails in a control-pressure space (52) of the fuel injection valve (12) and by which the injection-valve member (28) is acted upon at least indirectly in the closing direction, and with a third electrically controlled control valve (24), by means of which a connection (75) of the pump working space (22) with a relief space (24) is controlled, the said connection having arranged in it a pressure-limiting valve (26) opening towards the relief space (24), characterized in that a fuel pump (10), in each case with a first control valve (60) and with a third control valve (74), is provided for each cylinder of the internal combustion engine, and in that the first control valve (60) and the third control valve (74) of the fuel pump (10) are controlled by means of a common electrically activated actuator (80).
  2. Fuel injection device according to Claim 1, characterized in that the pressure which prevails in an actuator pressure space (82) and by which the first control valve (60) and the third control valve (74) are acted upon is controlled by means of the actuator (80).
  3. Fuel injection device according to Claim 1 or 2, characterized in that the pressure-limiting valve (76) is arranged upstream of the third control valve (74) in the connection (75).
EP02008447A 2001-05-17 2002-04-13 Fuel injection system for internal combustion engine Expired - Lifetime EP1260700B1 (en)

Applications Claiming Priority (2)

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DE10123995A DE10123995A1 (en) 2001-05-17 2001-05-17 Fuel injection device has third electrically operated control valve to control second connection between pump working cavity and relief cavity
DE10123995 2001-05-17

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EP1260700A1 EP1260700A1 (en) 2002-11-27
EP1260700B1 true EP1260700B1 (en) 2005-02-02

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DE10014451A1 (en) * 2000-03-23 2001-09-27 Bosch Gmbh Robert Method for forming injection pressure curve at injection systems e.g. of motor vehicles and injection system with pump and injection nozzles, has control valves mounted in pump which communicate with each other across HP line
DE10158660A1 (en) * 2001-11-30 2003-06-12 Bosch Gmbh Robert Fuel injection device for an internal combustion engine
DE10205750A1 (en) 2002-02-12 2003-08-21 Bosch Gmbh Robert Fuel injection device for an internal combustion engine
EP1826397A3 (en) * 2002-05-03 2009-08-05 Delphi Technologies, Inc. Fuel injection system
US7281523B2 (en) 2003-02-12 2007-10-16 Robert Bosch Gmbh Fuel injector pump system with high pressure post injection
US7146973B2 (en) * 2003-09-09 2006-12-12 James Pneumatics, Llc Launching device
US20060196974A1 (en) * 2005-03-01 2006-09-07 Caterpillar Inc. Fuel injector having a gradually restricted drain passageway
US7762478B1 (en) * 2006-01-13 2010-07-27 Continental Automotive Systems Us, Inc. High speed gasoline unit fuel injector
DE102016015037B3 (en) * 2016-12-16 2018-05-30 L'orange Gmbh fuel injector

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DE3823827A1 (en) * 1988-07-14 1990-01-18 Bosch Gmbh Robert FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES, IN PARTICULAR PUMPEDUESE
DE19504849A1 (en) * 1995-02-15 1996-08-22 Bosch Gmbh Robert Fuel injection device for internal combustion engines
GB9810327D0 (en) * 1998-05-15 1998-07-15 Lucas Ind Plc Fuel system and pump suitable for use therein
DE69905685T2 (en) * 1998-11-19 2003-10-02 Mitsubishi Motors Corp Fuel injection device of the battery type
DE19939421A1 (en) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Combined stroke / pressure controlled fuel injection method and system for an internal combustion engine

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EP1260700A1 (en) 2002-11-27
US20030010846A1 (en) 2003-01-16
DE10123995A1 (en) 2002-11-21
US6540160B2 (en) 2003-04-01

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