EP1029172A1 - Valve control unit for a fuel injection valve - Google Patents

Valve control unit for a fuel injection valve

Info

Publication number
EP1029172A1
EP1029172A1 EP99919056A EP99919056A EP1029172A1 EP 1029172 A1 EP1029172 A1 EP 1029172A1 EP 99919056 A EP99919056 A EP 99919056A EP 99919056 A EP99919056 A EP 99919056A EP 1029172 A1 EP1029172 A1 EP 1029172A1
Authority
EP
European Patent Office
Prior art keywords
valve control
control unit
valve
fuel
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99919056A
Other languages
German (de)
French (fr)
Other versions
EP1029172B1 (en
Inventor
Friedrich Boecking
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1029172A1 publication Critical patent/EP1029172A1/en
Application granted granted Critical
Publication of EP1029172B1 publication Critical patent/EP1029172B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M45/04—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 with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • 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
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • F02M2200/505—Adjusting spring tension by sliding spring seats

Definitions

  • the invention relates to a valve control unit for a fuel injection valve, in particular for a common rail injector, according to the preamble of patent claim 1.
  • Such a valve control unit is known for example from EP 0 661 442 AI.
  • Valve control units of this type are intended to control the injection process during the pre-injection and main injection of fuel (diesel fuel) in common-rail injectors.
  • the pressurization of one end of a displaceably mounted valve control piston of the valve control unit is influenced.
  • the other end of the valve control piston can act on a nozzle needle, so that the nozzle needle either seals an injection opening or allows fuel to escape from the injection opening.
  • the pressurization of the valve control piston is carried out by changing the pressure conditions within a first valve control chamber, which via a
  • Inlet channel is connected to a high pressure accumulator (common rail).
  • a high pressure accumulator common rail.
  • an outlet channel is opened which is connected to a second valve control chamber which is continuously connected to the first valve control chamber. Therefore, the pressure in the first valve control chamber drops and the hydraulic force on the valve control piston decreases.
  • a large-volume end member connected to the valve control piston must be moved within the first valve control chamber. Due to the stroke movement of the end member, the amount of fuel injected cannot be sufficiently minimized during the pre-injection. With the main injection it is also disadvantageous that a large volume of fuel within the first
  • Valve control chamber must be displaced by the end member when the valve control piston moves away from the injection opening. This prevents an increased speed of movement of the valve control piston and thus also of the nozzle needle during the main injection.
  • valve control unit for a fuel injector, in particular for a common rail injector, points to minimizing the quantity pre-injected fuel and to increase the speed of movement of the valve control piston, the characterizing features of claim 1.
  • the end member is composed of an inner and an outer member. Both components are displaceable relative to one another and connected to the valve control piston. When the drain channel is opened and fuel escapes from the first valve control chamber into the second valve control chamber, both components of the end member can move within the first valve control chamber. In the pre-injection, both components move together by a short stroke, while in the
  • valve control piston must be pushed out of the first valve control room.
  • the valve control piston can therefore only perform a small stroke. This keeps the pre-injected amount of fuel low. With the main injection, however, only the inner one moves
  • the valve control piston can therefore be moved with increased movement speed and a larger stroke.
  • the first valve control chamber has a first stop to limit the movement of the outer member in the direction of the second valve control chamber and a second stop to limit the movement of the inner member in
  • valve control unit An embodiment of the valve control unit according to the invention is shown in the drawing and explained in the following description.
  • the figure shows a longitudinal section through a valve control unit according to the invention.
  • valve control unit 1 is in an idle state in which the injection opening is closed, which is not shown in the figure.
  • a housing body 2 of the valve control unit 1 has a first valve control chamber 3 and a second valve control chamber 4 as the central object.
  • the movement of a valve control piston 5 can be influenced by changing the pressure conditions within the valve control rooms 3 and 4.
  • the valve control piston 5 has an end member 6, which comprises an inner member in the form of a piston section 7 and an outer member in the form of a control ring 8.
  • the control ring 8, which is concentric with the piston section 7, is displaceably arranged on an outer peripheral surface 9 of the piston section 7.
  • a compression spring 10 presses the control ring 8 with an annular surface 11 against a counter surface 12.
  • a mounting plate 13 b is fixedly connected to the piston section 7 by means of a fastening screw 13 a and has the counter surface 11 for supporting the compression spring 10.
  • the control ring 8 is therefore fastened under pretension.
  • a housing part 14 connected to the housing body 2 has a pressure chamber 15 which is connected to a high-pressure accumulator (common rail) via a connection channel 16.
  • the pressure chamber 15 has an inlet bore 17 through which fuel can escape. Fuel can flow into the first valve control chamber 3 by means of an inlet channel in the form of an inlet throttle 18.
  • the inlet bore 17 enables a high-pressure fuel (diesel fuel) Bottom 19 of the control ring 8 can be pressurized. If a valve ball 20, which is part of a conventional solenoid valve (not shown in the figure), releases an outlet channel in the form of an outlet throttle 21, the pressure drops within the second one
  • Valve control room As a result, the pressure within the first valve control chamber 3 also decreases. Fuel can flow out in the direction of arrow 22.
  • the end member 6 with an outer diameter d 2 therefore initially shifts by the stroke h ⁇ .
  • the control ring 8 therefore comes into contact with the ring surface 11 on a wall surface 23 of the first valve control chamber 3. Because of the stop, the control ring 8 cannot move any further in the direction of the outlet channel 21. Only a small amount of fuel is pre-injected.
  • the piston section 7 with an outer diameter di can additionally move by the stroke h G - h x .
  • the total stroke is designated with h G.
  • a member of the end member 6, namely the piston section 7, moves with a cross-sectional area that is reduced in comparison to the total cross-sectional volume of the end member 6. Less volume of fuel has to be forced out of the first valve control chamber 3 into the second valve control chamber 4.
  • the piston section 7 can therefore move faster than the entire end member 6 with its greater structural extension. Overall, it is therefore achieved that a smaller amount of fuel is expelled during the pilot injection and that an increased movement speed of the valve control piston 5 is possible during the main injection.
  • the nozzle needle (not shown) closes as a result of the movement of the valve control piston 5 in the direction of arrow 24, the piston section 7 initially moves away from the second valve control chamber 4 in the reverse order to the opening process. Then the control ring 8 is moved back into its rest position, so that the injection opening is closed again.

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

Abstract

The invention relates to a valve control unit (1) for a fuel injection valve, comprising two interconnected valve control compartments (3, 4). An end member (6) of a mobile valve control piston (5) can move in the first compartment (3) which is connected to an input channel (18). The second valve control compartment (4) is connected to a pluggable output channel (21). Said end member (6) is composed of an internal component (7) and an external component which can move relatively to each other. When the valve control piston moves, only the external component (8) moves to perform pre-injection and only the internal component (7) moves to perform main injection. The quantity of pre-injected fuel can be further minimised while simultaneously allowing an increase in the displacement speed of the valve control piston (5) during main injection.

Description

Ventilsteuereinheit für ein KraftstoffeinspritzventilValve control unit for a fuel injector
Stand der TechnikState of the art
Die Erfindung geht aus von einer Ventilsteuereinheit für ein Kraftstoffeinspritzventil , insbesondere für einen Common-Rail- Injektor, nach der Gattung des Patentanspruchs 1.The invention relates to a valve control unit for a fuel injection valve, in particular for a common rail injector, according to the preamble of patent claim 1.
Eine derartige Ventilsteuereinheit ist beispielsweise aus der EP 0 661 442 AI bekannt.Such a valve control unit is known for example from EP 0 661 442 AI.
Derartige Ventilsteuereinheiten sind dazu vorgesehen, den Einspritzvorgang bei der Vor- und Haupteinspritzung von Kraftstoff (Dieselkraftstoff) bei Common-Rail-Injektoren zu kontrollieren. Mittels der Ventilsteuereinheit wird die Druckbeaufschlagung des einen Endes eines verschieblich gelagerten Ventilsteuerkolbens der Ventilsteuereinheit beeinflußt. Das andere Ende des Ventilsteuerkolbens kann auf eine Düsennadel einwirken, so daß die Düsennadel entweder eine Einspritzöffnung abdichtet oder aber den Austritt von Kraftstoff aus der Einspritzöff ung zuläßt . Bei der bekannten Ventilsteuereinheit wird die Druckbeaufschlagung des Ventilsteuerkolbens durch Änderung der Druckverhältnisse innerhalb eines ersten Ventilsteuerraums durchgeführt, der über einenValve control units of this type are intended to control the injection process during the pre-injection and main injection of fuel (diesel fuel) in common-rail injectors. By means of the valve control unit, the pressurization of one end of a displaceably mounted valve control piston of the valve control unit is influenced. The other end of the valve control piston can act on a nozzle needle, so that the nozzle needle either seals an injection opening or allows fuel to escape from the injection opening. In the known valve control unit, the pressurization of the valve control piston is carried out by changing the pressure conditions within a first valve control chamber, which via a
Zulaufkanal mit einem Hochdruckspeicher (common rail) verbunden ist. Beim Ansteuern der Ventilsteuereinheit wird ein Ablaufkanal geöffnet, der an einen zweiten mit dem ersten Ventilsteuerraum durchgängig verbundenen Ventilsteuerraum angeschlossen ist. Deshalb sinkt der Druck im ersten Ventilsteuerraum, und die hydraulische Kraft auf den Ventilsteuerkolben nimmt ab. Nachteiligerweise muß innerhalb des ersten Ventilsteuerraums ein großvolumiges mit dem Ventilsteuerkolben verbundenes Endglied bewegt werden. Aufgrund der Hubbewegung des Endglieds kann bei der Voreinspritzung die eingespritzte Menge an Kraftstoff nicht ausreichend minimiert werden. Bei der Haupteinspritzung ist es ebenfalls von Nachteil, daß ein großes Volumen an Kraftstoff innerhalb des erstenInlet channel is connected to a high pressure accumulator (common rail). When the valve control unit is actuated, an outlet channel is opened which is connected to a second valve control chamber which is continuously connected to the first valve control chamber. Therefore, the pressure in the first valve control chamber drops and the hydraulic force on the valve control piston decreases. Disadvantageously, a large-volume end member connected to the valve control piston must be moved within the first valve control chamber. Due to the stroke movement of the end member, the amount of fuel injected cannot be sufficiently minimized during the pre-injection. With the main injection it is also disadvantageous that a large volume of fuel within the first
Ventilsteuerraums durch das Endglied verdrängt werden muß, wenn sich der Ventilsteuerkolben von der Einspritzöffnung wegbewegt. Dies verhindert eine erhöhte Bewegungsgeschwindigkeit des Ventilsteuerkolbens und damit auch der Düsennadel bei der Haupteinspritzung.Valve control chamber must be displaced by the end member when the valve control piston moves away from the injection opening. This prevents an increased speed of movement of the valve control piston and thus also of the nozzle needle during the main injection.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Ventilsteuereinheit für ein Kraftstoff-, einspritzventil, insbesondere für einen Common-Rail-Injektor, weist zur Minimierung der Menge voreingespritzten Kraftstoffs und zur Erhöhung der Bewegungsgeschwindigkeit des Ventilsteuerkolbens die kennzeichnenden Merkmale des Patentanspruchs 1 auf.The valve control unit according to the invention for a fuel injector, in particular for a common rail injector, points to minimizing the quantity pre-injected fuel and to increase the speed of movement of the valve control piston, the characterizing features of claim 1.
Das beim Stand der Technik vorhandene einteiligeThe one-piece existing in the prior art
Endglied setzt sich erfindungsgemäß aus einem inneren und einem äußeren Bauglied zusammen. Beide Bauglieder sind relativ zueinander verschieblich und mit dem Ventilsteuerkolben verbunden. Bei Öffnung des Ablaufkanals und bei Austritt von Kraftstoff aus dem ersten Ventilsteuerraum in den zweiten Ventilsteuerraum können sich beide Bauglieder des Endglieds innerhalb des ersten Ventilsteuerraums verschieben. Bei der Voreinspritzung verschieben sich beide Bauglieder gemeinsam um einen geringen Hub, während sich bei derAccording to the invention, the end member is composed of an inner and an outer member. Both components are displaceable relative to one another and connected to the valve control piston. When the drain channel is opened and fuel escapes from the first valve control chamber into the second valve control chamber, both components of the end member can move within the first valve control chamber. In the pre-injection, both components move together by a short stroke, while in the
Haupteinspritzung lediglich das innere Bauglied um einen weiteren Hub bewegt. Dies hat zur Folge, daß bei der Voreinspritzung infolge der Bewegung des Ventilsteuerkolbens zunächst ein größeres Volumen an Kraftstoff durch das Endglied (inneres und äußeresMain injection only moves the inner member by another stroke. This has the consequence that in the pre-injection due to the movement of the valve control piston, a larger volume of fuel through the end member (inner and outer
Bauglied) aus dem ersten Ventilsteuerraum herausgedrängt werden muß. Der Ventilsteuerkolben kann daher nur einen geringen Hub ausführen. Die voreingespritzte Menge an Kraftstoff wird dadurch gering gehalten. Bei der Haupteinspritzung bewegt sich dagegen nur das innereMember) must be pushed out of the first valve control room. The valve control piston can therefore only perform a small stroke. This keeps the pre-injected amount of fuel low. With the main injection, however, only the inner one moves
Bauglied des Endglieds, so daß ein geringeres Volumen an Kraftstoff aus dem ersten Ventilsteuerraum herausgedrängt werden muß. Der Ventilsteuerkolben kann daher mit erhöhter Bewegungsgeschwindigkeit und einem größeren Hub verfahren werden. Bei einer bevorzugten Ausführungsform weist der erste Ventilsteuerraum einen ersten Anschlag zur Begrenzung der Bewegung des äußeren Bauglieds in Richtung des zweiten Ventilsteuerraums und einen zweiten Anschlag zur Begrenzung der Bewegung des inneren Bauglieds inMember of the end member, so that a smaller volume of fuel must be forced out of the first valve control chamber. The valve control piston can therefore be moved with increased movement speed and a larger stroke. In a preferred embodiment, the first valve control chamber has a first stop to limit the movement of the outer member in the direction of the second valve control chamber and a second stop to limit the movement of the inner member in
Richtung des zweiten Ventilsteuerraums auf. Durch die Ausbildung der beiden Anschläge wird die Bewegung der Bauglieder innerhalb des ersten Ventilsteuerraums in definierter und reproduzierbarer Weise durchgeführt. Es wird stets eine gleiche geringe Menge an Kraftstoff voreingespritzt, ohne die erhöhteDirection of the second valve control room. Through the formation of the two stops, the movement of the structural members within the first valve control chamber is carried out in a defined and reproducible manner. An equal small amount of fuel is always pre-injected without the increased
Bewegungsgeschwindigkeit bei der Haupteinspritzung zu beeinträchtigen .Affect the speed of movement during the main injection.
Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstands der Erfindung sind der Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the subject matter of the invention can be found in the description, the drawing and the claims.
Zeichnungdrawing
Ein Ausführungsbeispiel der erfindungsgemäßen Ventilsteuereinheit ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung erläutert .An embodiment of the valve control unit according to the invention is shown in the drawing and explained in the following description.
Die Figur zeigt einen Längsschnitt durch eine erfindungsgemäße Ventilsteuereinheit .The figure shows a longitudinal section through a valve control unit according to the invention.
Beschreibung des Ausführungsbeispiels Das Ausführungsbeispiel einer Ventilsteuereinheit 1 befindet sich in einem Ruhezustand, bei dem die Einspritzöffnung geschlossen ist, die in der Figur nicht gezeigt ist.Description of the embodiment The exemplary embodiment of a valve control unit 1 is in an idle state in which the injection opening is closed, which is not shown in the figure.
Zum Öffnen und Schließen der Einspritzöffnung weist ein Gehäusekörper 2 der Ventilsteuereinheit 1 als zentralen Gegenstand einen ersten Ventilsteuerraum 3 und einen zweiten Ventilsteuerraum 4 auf . Über die Änderung der Druckverhältnisse innerhalb der Ventilsteuerräume 3 und 4 kann die Bewegung eines Ventilsteuerkolbens 5 beeinflußt werden. Der Ventilsteuerkolben 5 besitzt ein Endglied 6, das ein inneres Bauglied in Form eines Kolbenabschnitts 7 und ein äußeres Bauglied in Form eines Steuerrings 8 umfaßt. Der zu dem Kolbenabschnitt 7 konzentrische Steuerring 8 ist verschieblich auf einer Außenumfangsfläche 9 des Kolbenabschnitts 7 angeordnet. Eine Druckfeder 10 preßt den Sreuerring 8 mit einer Ringfläche 11 gegen eine Gegenfläche 12. Mittels einer Befestigungsschraube 13a ist eine Befestigungsplatte 13b mit dem Kolbenabschnitt 7 fest verbunden und weist zur Abstützung der Druckfeder 10 die Gegenfläche 11 auf. Der Steuεrring 8 ist daher unter Vorspannung befestigt .To open and close the injection opening, a housing body 2 of the valve control unit 1 has a first valve control chamber 3 and a second valve control chamber 4 as the central object. The movement of a valve control piston 5 can be influenced by changing the pressure conditions within the valve control rooms 3 and 4. The valve control piston 5 has an end member 6, which comprises an inner member in the form of a piston section 7 and an outer member in the form of a control ring 8. The control ring 8, which is concentric with the piston section 7, is displaceably arranged on an outer peripheral surface 9 of the piston section 7. A compression spring 10 presses the control ring 8 with an annular surface 11 against a counter surface 12. A mounting plate 13 b is fixedly connected to the piston section 7 by means of a fastening screw 13 a and has the counter surface 11 for supporting the compression spring 10. The control ring 8 is therefore fastened under pretension.
Ein mit dem Gehäusekörper 2 verbundenes Gehäuseteil 14 weist einen Druckraum 15 auf, der über einen Anschlußkanal 16 mit einem Hochdruckspeicher (common rail) in Verbindung steht. Der Druckraum 15 besitzt eine Zulaufbohrung 17, über die Kraftstoff austreten kann. Mittels eines Zulaufkanals in Form einer Zulaufdrossel 18 kann Kraftstoff in den ersten Ventilsteuerraum 3 strömen. Die Zulaufbohrung 17 ermöglicht es, daß unter Hochdruck stehender Kraftstoff (Dieselkraftstoff) eine Unterseite 19 des Steuerrings 8 druckbeaufschlagen kann. Wenn nun eine Ventilkugel 20, die Teil eines in der Figur nicht dargestellten herkömmlichen Magnetventils ist, einen Ablaufkanal in Form einer Ablaufdrossel 21 freigibt, sinkt der Druck innerhalb des zweitenA housing part 14 connected to the housing body 2 has a pressure chamber 15 which is connected to a high-pressure accumulator (common rail) via a connection channel 16. The pressure chamber 15 has an inlet bore 17 through which fuel can escape. Fuel can flow into the first valve control chamber 3 by means of an inlet channel in the form of an inlet throttle 18. The inlet bore 17 enables a high-pressure fuel (diesel fuel) Bottom 19 of the control ring 8 can be pressurized. If a valve ball 20, which is part of a conventional solenoid valve (not shown in the figure), releases an outlet channel in the form of an outlet throttle 21, the pressure drops within the second one
Ventilsteuerraums. Infolgedessen nimmt auch der Druck innerhalb des ersten Ventilsteuerraums 3 ab. Kraftstoff kann in Pfeilrichtung 22 abfließen. Das Endglied 6 mit einem Außendurchmesser d2 verschiebt sich daher zunächst um den Hub h^ . Der Steuerring 8 kommt daher mit der Ringfläche 11 an einer Wandfläche 23 des ersten Ventilsteuerraums 3 zur Anlage. Aufgrund des Anschlags kann sich der Steuerring 8 nicht weiter in Richtung des Ablaufkanals 21 bewegen. Es wird nur eine geringe Menge an Kraftstoff voreingespritzt. Bei der Haupteinspritzung kann anschließend der Kolbenabschnitt 7 mit einem Außendurchmesser di um den Hub hG - hx zusätzlich verfahren. Mit hG ist der Gesamthub bezeichnet. Bei der Haupteinspritzung bewegt sich ein Bauglied des Endglieds 6, nämlich der Kolbenabschnitt 7, mit einer im Vergleich zum gesamten Querschnittsvolumen des Endglieds 6 verringerten Querschnittsflache. Es muß weniger Volumen an Kraftstoff aus dem ersten Ventilsteuerraum 3 in den zweiten Ventilsteuerraum 4 hinausgedrängt werden. Der Kolbenabschnitt 7 kann sich daher schneller bewegen als das gesamte Endglied 6 mit seiner größeren baulichen Erstreckung. Insgesamt gesehen wird daher erreicht, daß eine geringere Menge an Kraftstoff bei der Voreinspritzung ausgestoßen wird und daß bei der Haupteinspritzung eine erhöhte Bewegungsgeschwindigkeit des Ventilsteuerkolbens 5 möglich ist . Beim Schließen der nicht gezeigten Düsennadel infolge der Bewegung des Ventilsteuerkolbens 5 in Pfeilrichtung 24 bewegt sich in umgekehrter Reihenfolge zum OffnungsVorgang der Kolbenabschnitt 7 zunächst wieder von dem zweiten Ventilsteuerraum 4 weg. Anschließend wird auch der Steuerring 8 in seine Ruhestellung zurückbewegt, so daß die Einspritzöffnung wieder geschlossen ist. Valve control room. As a result, the pressure within the first valve control chamber 3 also decreases. Fuel can flow out in the direction of arrow 22. The end member 6 with an outer diameter d 2 therefore initially shifts by the stroke h ^. The control ring 8 therefore comes into contact with the ring surface 11 on a wall surface 23 of the first valve control chamber 3. Because of the stop, the control ring 8 cannot move any further in the direction of the outlet channel 21. Only a small amount of fuel is pre-injected. In the case of the main injection, the piston section 7 with an outer diameter di can additionally move by the stroke h G - h x . The total stroke is designated with h G. During the main injection, a member of the end member 6, namely the piston section 7, moves with a cross-sectional area that is reduced in comparison to the total cross-sectional volume of the end member 6. Less volume of fuel has to be forced out of the first valve control chamber 3 into the second valve control chamber 4. The piston section 7 can therefore move faster than the entire end member 6 with its greater structural extension. Overall, it is therefore achieved that a smaller amount of fuel is expelled during the pilot injection and that an increased movement speed of the valve control piston 5 is possible during the main injection. When the nozzle needle (not shown) closes as a result of the movement of the valve control piston 5 in the direction of arrow 24, the piston section 7 initially moves away from the second valve control chamber 4 in the reverse order to the opening process. Then the control ring 8 is moved back into its rest position, so that the injection opening is closed again.

Claims

Patentansprüche claims
1. Ventilsteuereinheit für ein Kraftstoffeinspritzventil ,1. valve control unit for a fuel injection valve,
mit zwei miteinander durchgängig verbundenen Ventilsteuerräumen (3, 4) , in deren erstem mit einem Zulaufkanal (18) für Kraftstoff verbundenenwith two valve control rooms (3, 4) which are connected to one another throughout, the first of which is connected to an inlet channel (18) for fuel
Ventilsteuerraum (3) ein Endglied (6) eines verschieblichen Ventilsteuerkolbens (5) verfahrbar ist, und wobei der zweite Ventilsteuerraum (4) mit einem verschließbaren Ablaufkanal (21) verbunden ist,Valve control chamber (3) an end member (6) of a displaceable valve control piston (5) can be moved, and wherein the second valve control chamber (4) is connected to a closable drain channel (21),
dadurch gekennzeichnet,characterized,
daß das Endglied (6) aus einem inneren (7) und einem äußeren (8) Bauglied aufgebaut ist, die relativ zueinander verschieblich sind.that the end member (6) is constructed from an inner (7) and an outer (8) member which are displaceable relative to one another.
2. Ventilsteuereinheit nach Anspruch 1, dadurch gekennzeichnet, daß die Bauglieder (7, 8) konzentrisch zueinander sind.2. Valve control unit according to claim 1, characterized in that the members (7, 8) are concentric with each other.
3. Ventilsteuereinheit nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das innere Bauglied (7) starr mit dem Ventilsteuerkolben (5) verbunden ist, und daß Mittel (10, 13a, 13b) zur Halterung des äußeren Bauglieds (8) unter Vorspannung auf dem inneren Bauglied (7) vorgesehen sind.3. Valve control unit according to claim 1 or 2, characterized in that the inner member (7) is rigidly connected to the valve control piston (5), and that means (10, 13a, 13b) for holding the outer Member (8) under tension on the inner member (7) are provided.
4. Ventilsteuereinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das innere Bauglied (7) ein Endabschnitt des Ventilsteuerkolbens (5) ist, der durch einen stufenartigen Übergang von einem größeren (d2) auf einen kleineren (dx) Außendurchmesser des4. Valve control unit according to one of the preceding claims, characterized in that the inner member (7) is an end portion of the valve control piston (5) by a step-like transition from a larger (d 2 ) to a smaller (d x ) outer diameter of the
Ventilsteuerkolbens (5) gebildet wird, und daß das äußere Bauglied (8) ein Steuerring ist.Valve control piston (5) is formed, and that the outer member (8) is a control ring.
5. Ventilsteuereinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß an einem Gehäusekörper (2) der Ventilsteuereinheit (1) ein erster Anschlag zur Begrenzung der Bewegung des äußeren Bauglieds (8) in Richtung des zweiten Ventilsteuerraums (4) und zweiter Anschlag zur5. Valve control unit according to one of the preceding claims, characterized in that on a housing body (2) of the valve control unit (1) has a first stop for limiting the movement of the outer member (8) in the direction of the second valve control chamber (4) and second stop
Begrenzung der Bewegung des inneren Bauglieds (7) in Richtung des zweiten Ventilsteuerraums (4) ausgebildet ist.Limiting the movement of the inner member (7) in the direction of the second valve control chamber (4) is formed.
6. Ventilsteuereinheit nach Anspruch 5, dadurch gekennzeichnet, daß die Anschläge innerhalb des ersten Ventilsteuerraums (3) ausgebildet sind. 6. Valve control unit according to claim 5, characterized in that the stops are formed within the first valve control chamber (3).
EP99919056A 1998-06-16 1999-03-10 Valve control unit for a fuel injection valve Expired - Lifetime EP1029172B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19826791A DE19826791A1 (en) 1998-06-16 1998-06-16 Valve control unit for a fuel injector
DE19826791 1998-06-16
PCT/DE1999/000641 WO1999066193A1 (en) 1998-06-16 1999-03-10 Valve control unit for a fuel injection valve

Publications (2)

Publication Number Publication Date
EP1029172A1 true EP1029172A1 (en) 2000-08-23
EP1029172B1 EP1029172B1 (en) 2003-09-03

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Application Number Title Priority Date Filing Date
EP99919056A Expired - Lifetime EP1029172B1 (en) 1998-06-16 1999-03-10 Valve control unit for a fuel injection valve

Country Status (7)

Country Link
US (1) US6244245B1 (en)
EP (1) EP1029172B1 (en)
JP (1) JP2002518630A (en)
CN (1) CN1158456C (en)
CZ (1) CZ293709B6 (en)
DE (2) DE19826791A1 (en)
WO (1) WO1999066193A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1163440B1 (en) * 1999-03-18 2005-10-05 Delphi Technologies, Inc. Fuel injector
DE19945314A1 (en) * 1999-09-22 2001-04-05 Bosch Gmbh Robert Common rail injector
DE19963920B4 (en) * 1999-12-31 2005-01-13 Robert Bosch Gmbh Injector for a common-rail fuel injection system with a slide-controlled inlet channel and direct coupling of the control piston and the nozzle channel
DE10015268A1 (en) * 2000-03-28 2001-10-04 Siemens Ag Injector with bypass throttle
DE10031580A1 (en) * 2000-06-29 2002-01-17 Bosch Gmbh Robert Pressure-controlled control part for common rail injectors
DE10055267B4 (en) * 2000-11-08 2004-07-29 Robert Bosch Gmbh Pressure-controlled injector for high injection with slide throttles
JP3527214B2 (en) * 2001-04-26 2004-05-17 株式会社日本自動車部品総合研究所 Fuel injection valve
DE10122256A1 (en) * 2001-05-08 2002-11-21 Bosch Gmbh Robert Fuel injection device for internal combustion engines, in particular common rail injector, and fuel system and internal combustion engine
DE10154802A1 (en) * 2001-11-08 2003-05-22 Bosch Gmbh Robert Fuel injection device for an internal combustion engine
DE10211439A1 (en) * 2002-03-15 2003-10-02 Bosch Gmbh Robert Fuel injection device for an internal combustion engine
US7334741B2 (en) * 2005-01-28 2008-02-26 Cummins Inc. Fuel injector with injection rate control
DE102006034112A1 (en) * 2006-07-24 2008-01-31 Robert Bosch Gmbh fuel injector
US7748445B2 (en) * 2007-03-02 2010-07-06 National Oilwell Varco, L.P. Top drive with shaft seal isolation
WO2014193356A1 (en) * 2013-05-29 2014-12-04 International Engine Intellectual Property Company, Llc Fuel injector
JP6642478B2 (en) * 2017-02-22 2020-02-05 株式会社デンソー Fuel injection device
DE102018212665A1 (en) * 2018-07-30 2020-01-30 Robert Bosch Gmbh Piston pump and fuel delivery device for cryogenic fuels

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH495504A (en) * 1968-08-28 1970-08-31 Sopromi Soc Proc Modern Inject Fuel injection valve with electromagnetic actuation
DE1808650A1 (en) * 1968-11-13 1970-06-18 Bosch Gmbh Robert Fuel injector
US4640252A (en) * 1984-01-28 1987-02-03 Mazda Motor Corporation Fuel injection system for diesel engine
IT1261149B (en) * 1993-12-30 1996-05-09 Elasis Sistema Ricerca Fiat DOSING VALVE FOR THE CONTROL OF THE SHUTTER OF A FUEL INJECTOR
EP0807757A1 (en) * 1994-06-06 1997-11-19 Ganser-Hydromag Ag Fuel injection valve for internal combustion engines
GB9507115D0 (en) * 1995-04-06 1995-05-31 Lucas Ind Plc Fuel pumping apparatus
FI101739B1 (en) * 1996-08-16 1998-08-14 Waertsila Nsd Oy Ab An injection valve
JP3823391B2 (en) * 1996-08-31 2006-09-20 いすゞ自動車株式会社 Engine fuel injector
GB9713791D0 (en) * 1997-07-01 1997-09-03 Lucas Ind Plc Fuel injector
GB9714647D0 (en) * 1997-07-12 1997-09-17 Lucas Ind Plc Injector
DE19816316A1 (en) * 1998-04-11 1999-10-14 Bosch Gmbh Robert Fuel injection device for internal combustion engines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9966193A1 *

Also Published As

Publication number Publication date
DE59906857D1 (en) 2003-10-09
WO1999066193A1 (en) 1999-12-23
US6244245B1 (en) 2001-06-12
CZ2000116A3 (en) 2001-01-17
EP1029172B1 (en) 2003-09-03
DE19826791A1 (en) 1999-12-23
CZ293709B6 (en) 2004-07-14
JP2002518630A (en) 2002-06-25
CN1272163A (en) 2000-11-01
CN1158456C (en) 2004-07-21

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