EP1434939B1 - Fuel injection device for internal combustion engines - Google Patents

Fuel injection device for internal combustion engines Download PDF

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Publication number
EP1434939B1
EP1434939B1 EP02776673A EP02776673A EP1434939B1 EP 1434939 B1 EP1434939 B1 EP 1434939B1 EP 02776673 A EP02776673 A EP 02776673A EP 02776673 A EP02776673 A EP 02776673A EP 1434939 B1 EP1434939 B1 EP 1434939B1
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EP
European Patent Office
Prior art keywords
valve
space
piston
control
injection device
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
EP02776673A
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German (de)
French (fr)
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EP1434939A1 (en
Inventor
Friedrich Boecking
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1434939A1 publication Critical patent/EP1434939A1/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
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
    • 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
    • F02M57/00—Fuel-injectors combined or associated with other devices
    • F02M57/02—Injectors structurally combined with fuel-injection pumps
    • F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
    • F02M57/025—Injectors structurally combined with fuel-injection pumps characterised by the pump drive hydraulic, e.g. with pressure amplification
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • 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
    • F02M63/0043—Two-way valves
    • 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
    • F02M63/0064—Two or more actuators acting on two or more valve bodies

Definitions

  • the invention is based on a fuel injection device with several each provided in an injection line of the fuel Injectors.
  • Each injection valve includes a nozzle space, a control space, an injection openings the nozzle chamber controlling valve member, which via a in the nozzle chamber located, acting in the valve opening direction first control surface and over one located in the control chamber, acting in the valve closing direction second Control surface is actuated against the action of a closing spring, a in Compression direction displaceable piston, which frontally with a the injection line connected to the first compression space for generating limited the injection pressure, a first valve for (indirect) control the pressure build-up in the first compression space and a second valve for Control of the pressure build-up in the control room and a second Compression space (differential space), by an annular shoulder of the Piston is limited.
  • the operation of the piston is done by discharge of the second compression space (differential space) by means of the first valve.
  • the fuel injection device according to the invention with the Characteristic features of claim 1 has in contrast the advantage that by means of the stepped piston of the high pressure for the Injection and the control pressure for the control room separated from each other be generated. As a result, precisely controllable forward and / or Post-injections possible.
  • the fuel injection device for internal combustion engines shown in Fig. 1 comprises a pump-nozzle unit (PDE) 1, in which the fuel by means of a pump piston 2 compressed to a higher injection pressure and via an injection line 3 to a projecting into the combustion chamber of the engine to be supplied injection valve (Injector) 4 is discharged.
  • PDE pump-nozzle unit
  • Injector injection valve
  • Per cylinder of the internal combustion engine in each case a pump-nozzle unit 1 is installed in a cylinder head.
  • the pump piston 2 is driven by a cam 5 of the engine camshaft against the action of a return spring 6 .
  • a piston-shaped valve member (nozzle needle) 8 is slidably mounted with a conical valve sealing surface 9 , which is pressed by a closing spring 10 against a conical valve seat surface 11 of the valve housing and the injection openings 12 provided there closes.
  • the injection line 3 opens into an annular nozzle chamber 13, from which an annular gap extending between guide bore 7 and valve member 8 leads to the valve seat surface 11.
  • the valve member 8 has in the region of the nozzle chamber 13 designed as a pressure shoulder first control surface 14 to which the supplied via the injection line 3 fuel in the opening direction (ie, inwardly) engages the valve member 8.
  • valve sealing surface 9 facing away from the end face of the valve member 8 engages a closing piston 15
  • the valve sealing surface 9 facing away from the end face forms a second control surface 16 .
  • the second control surface 16 defines a control chamber 17 and acts in the valve closing direction.
  • the pump piston 2 defines with its side facing away from the cam 5 a first compression space 18 connected to the injection line 3 and an annular shoulder 19 a second compression space 20 which is connected via a throttle 21 to the control chamber 17.
  • the two compression chambers 18, 20 are each connected via a check valve 22, 23 to a supply line 24 of the fuel.
  • the first compression chamber 18, from which the injection line 3 goes off, can be connected via a first valve 25 and the control chamber 17 via a second valve 26 to a relief line (leak oil) 27 .
  • the two valves 25, 26 are designed as 2/2-way valves with piezoelectric actuators 28, 29 .
  • the second control surface 16 is larger than the first control surface 14, so that when the valves 25, 26 and at the same high pressure in the nozzle chamber 13 and in the control chamber 17, the valve member 8, the injection openings 12 closes.
  • the beginning of the injection process is during the compression stroke the pump piston 2 and at pressure-relieved control chamber 17 (i.e., with the second valve 26 open) Close the first valve 25 initiated.
  • the first Compression space 18 and thus also in the nozzle chamber 13 builds the higher injection pressure.
  • the valve member 8 pressure-controlled against the action of the closing spring 10, the fuel is injected into the combustion chamber. If now also the second valve 26 is closed, builds up in the second compression space 20 and thus also in the Control chamber 17 a higher fuel pressure.
  • the control room 17 is no longer depressurized, so that the valve member 8 closes the injection openings 12.
  • the fuel injection device shown in FIG. 2 uses a bypass piston 115, whose end face facing away from the valve sealing surface 9 forms the second control surface 116 and delimits the control chamber 117.
  • the closing spring 110 is supported at the second control surface 116 facing away from the end of the bypass piston 115 and a head 128 of the valve member 108.
  • the bypass piston 115 and the head 128 are displaceably mounted in a common axial guide bore 129 of the injection valve 4.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoffeinspritzvorrichtung mit mehreren jeweils in einer Einspritzleitung des Kraftstoffs vorgesehenen Einspritzventilen.The invention is based on a fuel injection device with several each provided in an injection line of the fuel Injectors.

Aus der WO 01/52916A ist ebenfalls eine Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen mit mehreren jeweils in einer Einspritzleitung des Kraftstoffs vorgesehenen Einspritzventilen bekannt. Jedes Einspritzventil umfasst einen Düsenraum, einen Steuerraum, ein die Einspritzöffnungen des Düsenraums steuerndes Ventilglied, welches über eine im Düsenraum befindliche, in Ventilöffnungsrichtung wirkende erste Steuerfläche und über eine im Steuerraum befindliche, in Ventilschließrichtung wirkende zweite Steuerfläche gegen die Wirkung einer Schließfeder betätigbar ist, einen in Kompressionsrichtung verschiebbaren Kolben, welcher stirnseitig einen mit der Einspritzleitung verbundenen ersten Kompressionsraum zur Erzeugung des Einspritzdruckes begrenzt, ein erstes Ventil zum (indirekten) Steuern des Druckaufbaus im ersten Kompressionsraum und ein zweites Ventil zum Steuern des Druckaufbaus im Steuerraum sowie einen zweiten Kompressionsraum (Differenzraum), der durch eine Ringschulter des Kolbens begrenzt ist. Die Betätigung des Kolbens erfolgt durch Entlastung des zweiten Kompressionsraums (Differenzraum) mittels des ersten Ventils.From WO 01 / 52916A is also a fuel injection device for Internal combustion engines with several each in an injection line of the Fuel provided injectors known. Each injection valve includes a nozzle space, a control space, an injection openings the nozzle chamber controlling valve member, which via a in the nozzle chamber located, acting in the valve opening direction first control surface and over one located in the control chamber, acting in the valve closing direction second Control surface is actuated against the action of a closing spring, a in Compression direction displaceable piston, which frontally with a the injection line connected to the first compression space for generating limited the injection pressure, a first valve for (indirect) control the pressure build-up in the first compression space and a second valve for Control of the pressure build-up in the control room and a second Compression space (differential space), by an annular shoulder of the Piston is limited. The operation of the piston is done by discharge of the second compression space (differential space) by means of the first valve.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzvorrichtung mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß mittels des gestuften Kolbens der Hochdruck für die Einspritzung und der Steuerdruck für den Steuerraum getrennt voneinander erzeugt werden. Dadurch sind exakt steuerbare Vor- und/oder Nacheinspritzungen möglich.The fuel injection device according to the invention with the Characteristic features of claim 1 has in contrast the advantage that by means of the stepped piston of the high pressure for the Injection and the control pressure for the control room separated from each other be generated. As a result, precisely controllable forward and / or Post-injections possible.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstands der Erfindung sind der Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous embodiments of the subject matter of Invention are the description, the drawings and the claims removable.

Zeichnungdrawing

Zwei Ausführungsbeispiele der erfindungsgemäßen Kraftstoffeinspritzvorrichtung sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
die wesentlichen Komponenten einer ersten erfindungsgemäßen Kraftstoffeinspritzvorrichtung mit einem gestuften Pumpkolben und einem auf das Ventilglied wirkenden Schließkolben; und
Fig. 2
die wesentlichen Komponenten einer zweiten erfindungsgemäßen Kraftstoffeinspritzvorrichtung mit einem gestuften Pumpkolben und einem auf das Ventilglied wirkenden Ausweichkolben.
Two embodiments of the fuel injection device according to the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:
Fig. 1
the essential components of a first fuel injection device according to the invention with a stepped pump piston and a closing piston acting on the valve member; and
Fig. 2
the essential components of a second fuel injection device according to the invention with a stepped pump piston and acting on the valve member Ausweichkolben.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die in Fig. 1 gezeigte Kraftstoffeinspritzvorrichtung für Brennkraftmaschinen umfaßt eine Pumpe-Düse-Einheit (PDE) 1, bei welcher der Kraftstoff mittels eines Pumpkolbens 2 auf einen höheren Einspritzdruck verdichtet und über eine Einspritzleitung 3 zu einem in den Brennraum der zu versorgenden Brennkraftmaschine ragenden Einspritzventil (Injektor) 4 abgeführt wird. Pro Zylinder der Brennkraftmaschine ist jeweils eine Pumpe-Düse-Einheit 1 in einen Zylinderkopf eingebaut. Der Pumpkolben 2 wird von einer Nokke 5 der Motornockenwelle gegen die Wirkung einer Rückstellfeder 6 angetrieben.The fuel injection device for internal combustion engines shown in Fig. 1 comprises a pump-nozzle unit (PDE) 1, in which the fuel by means of a pump piston 2 compressed to a higher injection pressure and via an injection line 3 to a projecting into the combustion chamber of the engine to be supplied injection valve (Injector) 4 is discharged. Per cylinder of the internal combustion engine, in each case a pump-nozzle unit 1 is installed in a cylinder head. The pump piston 2 is driven by a cam 5 of the engine camshaft against the action of a return spring 6 .

In einer axialen Führungsbohrung 7 des Einspritzventils 4 ist ein kolbenförmiges Ventilglied (Düsennadel) 8 mit einer konischen Ventildichtfläche 9 verschiebbar gelagert, welche durch eine Schließfeder 10 gegen eine konische Ventilsitzfläche 11 des Ventilgehäuses gedrückt wird und die dort vorgesehenen Einspritzöffnungen 12 verschließt. Die Einspritzleitung 3 mündet im Einspritzventil 4 in einen ringförmigen Düsenraum 13, von dem ein zwischen Führungsbohrung 7 und Ventilglied 8 verlaufender Ringspalt bis zur Ventilsitzfläche 11 führt. Das Ventilglied 8 hat im Bereich des Düsenraumes 13 eine als Druckschulter ausgebildete erste Steuerfläche 14, an welcher der über die Einspritzleitung 3 zugeführte Kraftstoff im Öffnungssinn (d.h. nach innen) am Ventilglied 8 angreift. An der der Ventildichtfläche 9 abgewandten Stirnseite des Ventilglieds 8 greift ein Schließkolben 15 an, dessen der Ventildichtfläche 9 abgewandte Stirnseite eine zweite Steuerfläche 16 bildet. Die zweite Steuerfläche 16 begrenzt einen Steuerraum 17 und wirkt in Ventilschließrichtung.In an axial guide bore 7 of the injection valve 4, a piston-shaped valve member (nozzle needle) 8 is slidably mounted with a conical valve sealing surface 9 , which is pressed by a closing spring 10 against a conical valve seat surface 11 of the valve housing and the injection openings 12 provided there closes. In the injection valve 4, the injection line 3 opens into an annular nozzle chamber 13, from which an annular gap extending between guide bore 7 and valve member 8 leads to the valve seat surface 11. The valve member 8 has in the region of the nozzle chamber 13 designed as a pressure shoulder first control surface 14 to which the supplied via the injection line 3 fuel in the opening direction (ie, inwardly) engages the valve member 8. At the valve sealing surface 9 facing away from the end face of the valve member 8 engages a closing piston 15 , the valve sealing surface 9 facing away from the end face forms a second control surface 16 . The second control surface 16 defines a control chamber 17 and acts in the valve closing direction.

Der Pumpkolben 2 begrenzt mit seiner der Nocke 5 abgewandten Stirnseite einen mit der Einspritzleitung 3 verbundenen ersten Kompressionsraum 18 und mit einer Ringschulter 19 einen zweiten Kompressionsraum 20, der über eine Drossel 21 mit dem Steuerraum 17 verbunden ist. Die beiden Kompressionsräume 18, 20 sind jeweils über ein Rückschlagventil 22, 23 mit einer Zufuhrleitung 24 des Kraftstoffs verbunden. Der erste Kompressionsraum 18, von dem die Einspritzleitung 3 abgeht, ist über ein erstes Ventil 25 und der Steuerraum 17 über ein zweites Ventil 26 mit einer Entlastungsleitung (Lecköl) 27 verbindbar. Die beiden Ventile 25, 26 sind als 2/2-Wege-Ventile mit piezoelektrischen Stellantrieben 28, 29 ausgebildet. Im ersten Kompressionsraum 18 wird der Hochdruck für die Einspritzung und im zweiten Kompressionsraum 20 der Hochdruck für die Steuerfunktion des Steuerraums 17 erzeugt. Die zweite Steuerfläche 16 ist größer als die erste Steuerfläche 14, so daß bei geschlossenen Ventilen 25, 26 und bei gleichem Hochdruck im Düsenraum 13 und im Steuerraum 17 das Ventilglied 8 die Einspritzöffnungen 12 verschließt. The pump piston 2 defines with its side facing away from the cam 5 a first compression space 18 connected to the injection line 3 and an annular shoulder 19 a second compression space 20 which is connected via a throttle 21 to the control chamber 17. The two compression chambers 18, 20 are each connected via a check valve 22, 23 to a supply line 24 of the fuel. The first compression chamber 18, from which the injection line 3 goes off, can be connected via a first valve 25 and the control chamber 17 via a second valve 26 to a relief line (leak oil) 27 . The two valves 25, 26 are designed as 2/2-way valves with piezoelectric actuators 28, 29 . In the first compression chamber 18, the high pressure for the injection and in the second compression chamber 20 of the high pressure for the control function of the control chamber 17 is generated. The second control surface 16 is larger than the first control surface 14, so that when the valves 25, 26 and at the same high pressure in the nozzle chamber 13 and in the control chamber 17, the valve member 8, the injection openings 12 closes.

Während des Förderhubs des Pumpkolbens 2 werden die beiden Kompressionsräume 18, 20 über die Zufuhrleitung 24 mit Kraftstoff befüllt. Durch den Kompressionshub des Pumpkolbens 2 wird, wenn beide Ventile 25, 26 geschlossen sind, der in den Kompressionsräumen 18, 20 befindliche Kraftstoff auf einen höheren Druck verdichtet, wobei die Rückschlagventile 22, 23 den Rückfluß von komprimiertem Kraftstoff zurück in die Zufuhrleitung 24 verhindern.During the delivery stroke of the pump piston 2, the two Compression spaces 18, 20 via the supply line 24 with Fuel filled. By the compression stroke of the pump piston 2, when both valves 25, 26 are closed, the fuel in the compression chambers 18, 20 compressed to a higher pressure, with the check valves 22, 23 the return of compressed fuel back into the supply line 24 prevent.

Der Beginn des Einspritzvorgangs wird während des Kompressionshubs des Pumpkolbens 2 und bei druckentlastetem Steuerraum 17 (d.h. bei geöffnetem zweiten Ventil 26) durch Schließen des ersten Ventils 25 eingeleitet. Im ersten Kompressionsraum 18 und damit auch im Düsenraum 13 baut sich der höhere Einspritzdruck auf. Sobald der im Düsenraum 13 herrschende Kraftstoffdruck ausreicht, das Ventilglied 8 druckgesteuert gegen die Wirkung der Schließfeder 10 zu öffnen, wird der Kraftstoff in den Brennraum eingespritzt. Wird nun auch das zweite Ventil 26 geschlossen, baut sich im zweiten Kompressionsraum 20 und damit auch im Steuerraum 17 ein höherer Kraftstoffdruck auf. Der Steuerraum 17 ist nicht mehr druckentlastet, so daß das Ventilglied 8 die Einspritzöffnungen 12 verschließt. Durch Öffnen des zweiten Ventils 26 wird der Steuerraum 17 wieder druckentlastet, und das Ventilglied 8 öffnet hubgesteuert, so daß eine Nacheinspritzung mit dem im Düsenraum 13 herrschenden Kraftstoffdruck durchgeführt wird. Wenn der im Düsenraum 13 herrschende Kraftstoffdruck nicht mehr ausreicht, das Ventilglied 8 aufzusteuern, schließt die Schließfeder 10 das Ventilglied 8, und der Einspritzvorgang ist beendet. The beginning of the injection process is during the compression stroke the pump piston 2 and at pressure-relieved control chamber 17 (i.e., with the second valve 26 open) Close the first valve 25 initiated. In the first Compression space 18 and thus also in the nozzle chamber 13 builds the higher injection pressure. Once in the nozzle room 13 prevailing fuel pressure is sufficient, the valve member 8 pressure-controlled against the action of the closing spring 10, the fuel is injected into the combustion chamber. If now also the second valve 26 is closed, builds up in the second compression space 20 and thus also in the Control chamber 17 a higher fuel pressure. The control room 17 is no longer depressurized, so that the valve member 8 closes the injection openings 12. By opening of the second valve 26, the control chamber 17 again depressurized, and the valve member 8 opens stroke-controlled, so that a post-injection with the prevailing in the nozzle chamber 13 Fuel pressure is performed. If the im Nozzle chamber 13 prevailing fuel pressure is no longer sufficient aufzusteuern the valve member 8, closes the Closing spring 10, the valve member 8, and the injection process is finished.

Die in Fig. 2 gezeigte Kraftstoffeinspritzvorrichtung verwendet statt eines Schließkolbens einen Ausweichkolben 115, dessen der Ventildichtfläche 9 abgewandte Stirnseite die zweite Steuerfläche 116 bildet und den Steuerraum 117 begrenzt. An dem der zweiten Steuerfläche 116 abgewandten Ende des Ausweichkolbens 115 und an einem Kopf 128 des Ventilglieds 108 ist die Schließfeder 110 abgestützt. Der Ausweichkolben 115 und der Kopf 128 sind in einer gemeinsamen axialen Führungsbohrung 129 des Einspritzventils 4 verschiebbar gelagert.Instead of a closing piston, the fuel injection device shown in FIG. 2 uses a bypass piston 115, whose end face facing away from the valve sealing surface 9 forms the second control surface 116 and delimits the control chamber 117. At the second control surface 116 facing away from the end of the bypass piston 115 and a head 128 of the valve member 108, the closing spring 110 is supported. The bypass piston 115 and the head 128 are displaceably mounted in a common axial guide bore 129 of the injection valve 4.

Bei geöffnetem zweiten Ventil 26 ist der Steuerraum 117 über die Entlastungsleitung 27 druckentlastet und der Ausweichkolben 115 in seine in Ventilöffnungsrichtung äußerste Stellung verschoben, so daß der im Düsenraum 13 herrschende Kraftstoffdruck ausreicht, das Ventilglied 108 gegen die Schließfeder 110 aufzusteuern. Bei geschlossenem zweiten Ventil 26 wird durch den im Steuerraum 117 herrschenden Kraftstoffdruck der Ausweichkolben 115 in Ventilschließrichtung verschoben und dadurch die Schließfeder 110 so weit zusammengedrückt, daß der im Düsenraum 13 herrschende Kraftstoffdruck nicht mehr ausreicht, das Ventilglied 108 aufzusteuern.When the second valve 26 is open, the control chamber 117 relieved of pressure via the discharge line 27 and the bypass piston 115 in its valve opening direction outermost Position shifted so that the prevailing in the nozzle chamber 13 Fuel pressure sufficient, the valve member 108 against aufzusteuern the closing spring 110. When closed second valve 26 is dominated by the control chamber 117 in the Fuel pressure of the bypass piston 115 in the valve closing direction moved and thereby the closing spring 110 so far compressed that the in the nozzle chamber 13th ruling fuel pressure is no longer sufficient, the valve member 108 aufzusteuern.

Claims (5)

  1. Fuel injection device for internal combustion engines, having a plurality of injection valves (4; 104) which are each provided in an injection line (3) of the fuel and which each have a nozzle space (13), a control space (17; 117), a valve element (8; 108) which controls the injection openings (12) of the nozzle space (13) and which can be activated counter to the effect of a closing spring (10; 110) by means of a first control face (14) which is located in the nozzle space (13) and acts in the valve opening direction and by means of a second control face (16; 116) which is located in the control space (17; 117) and acts in the valve closing direction, a piston (2) which can be displaced in the compression direction and which bounds at the end a first compression space (18) which is connected to the injection line (3) and has the purpose of generating the injection pressure, a first valve (25) for connecting the first compression space (18) to a relief line (27) and a second valve (26) for connecting the control space (17; 117) to the relief line (27) as well as a second compression space (20) which is connected to the control space (17; 117) and is bounded by an annular shoulder (19) of the piston (2).
  2. Fuel injection device according to Claim 1, characterized in that the second control face (16) is formed by the end of a closing piston (15) which bears against the valve element (8) at the other end.
  3. Fuel injection device according to Claim 1, characterized in that the second control face (116) is formed by the end of a bypass piston (115), on the other end of which the closing spring (110) of the valve element (118) is supported.
  4. Fuel injection device according to one of the preceding claims, characterized in that the two compression spaces (18, 20) are each connected to a feed line (24) for the fuel via a non-return valve (22, 23).
  5. Fuel injection device according to one of the preceding claims, characterized by a cam (5) which drives the piston (2) counter to the effect of a restoring spring (6).
EP02776673A 2001-10-04 2002-09-14 Fuel injection device for internal combustion engines Expired - Lifetime EP1434939B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10149004A DE10149004C1 (en) 2001-10-04 2001-10-04 Fuel injection device for IC engine has compression piston displaced in compression space provided with annular shoulder defining second compression space
DE10149004 2001-10-04
PCT/DE2002/003449 WO2003031802A1 (en) 2001-10-04 2002-09-14 Fuel injection device for internal combustion engines

Publications (2)

Publication Number Publication Date
EP1434939A1 EP1434939A1 (en) 2004-07-07
EP1434939B1 true EP1434939B1 (en) 2005-08-24

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Application Number Title Priority Date Filing Date
EP02776673A Expired - Lifetime EP1434939B1 (en) 2001-10-04 2002-09-14 Fuel injection device for internal combustion engines

Country Status (5)

Country Link
US (1) US6908043B2 (en)
EP (1) EP1434939B1 (en)
JP (1) JP2005504921A (en)
DE (2) DE10149004C1 (en)
WO (1) WO2003031802A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1359316B1 (en) * 2002-05-03 2007-04-18 Delphi Technologies, Inc. Fuel injection system
DE10251932B4 (en) * 2002-11-08 2007-07-12 Robert Bosch Gmbh Fuel injection device with integrated pressure booster
DE10355411B3 (en) * 2003-11-27 2005-07-14 Siemens Ag Injection system and injection method for an internal combustion engine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19940294A1 (en) * 1999-08-25 2001-03-01 Bosch Gmbh Robert Fuel injector

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
JPS57124073A (en) * 1981-01-24 1982-08-02 Diesel Kiki Co Ltd Fuel injection device
US5826562A (en) * 1994-07-29 1998-10-27 Caterpillar Inc. Piston and barrell assembly with stepped top and hydraulically-actuated fuel injector utilizing same
US5641121A (en) * 1995-06-21 1997-06-24 Servojet Products International Conversion of non-accumulator-type hydraulic electronic unit injector to accumulator-type hydraulic electronic unit injector
US5992359A (en) * 1996-06-13 1999-11-30 Rose; Nigel Eric Fluid actuated engines and engine mechanisms
DE19910970A1 (en) * 1999-03-12 2000-09-28 Bosch Gmbh Robert Fuel injector
DE19939429A1 (en) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Fuel injector
DE19939419A1 (en) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Fuel injector
DE10002273A1 (en) * 2000-01-20 2001-08-02 Bosch Gmbh Robert Injection device and method for injecting fluid

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19940294A1 (en) * 1999-08-25 2001-03-01 Bosch Gmbh Robert Fuel injector

Also Published As

Publication number Publication date
US20040046061A1 (en) 2004-03-11
EP1434939A1 (en) 2004-07-07
DE10149004C1 (en) 2003-02-27
WO2003031802A1 (en) 2003-04-17
DE50204043D1 (en) 2005-09-29
US6908043B2 (en) 2005-06-21
JP2005504921A (en) 2005-02-17

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