DE102004030448A1 - Fuel injector - Google Patents
Fuel injector Download PDFInfo
- Publication number
- DE102004030448A1 DE102004030448A1 DE200410030448 DE102004030448A DE102004030448A1 DE 102004030448 A1 DE102004030448 A1 DE 102004030448A1 DE 200410030448 DE200410030448 DE 200410030448 DE 102004030448 A DE102004030448 A DE 102004030448A DE 102004030448 A1 DE102004030448 A1 DE 102004030448A1
- Authority
- DE
- Germany
- Prior art keywords
- valve
- needle
- pressure
- control
- fuel
- 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.)
- Withdrawn
Links
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
- 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
- F02M45/086—Having more than one injection-valve controlling discharge orifices
-
- 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
- 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
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0005—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using valves actuated by fluid 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
- 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
- F02M63/0045—Three-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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/46—Valves, e.g. injectors, with concentric valve bodies
Abstract
Eine Kraftstoff-Einspritzvorrichtung (1) mit einem Einspritzventil (8), dem Kraftstoff unter hohem Druck zuzuführen ist, wobei das Einspritzventil (8) eine äußere Ventilnadel (11) (oder Nadel oder Ventilkolben) aufweist, die rohrförmig ist und eine innere Ventilnadel (20) (oder Nadel, Ventilkolben) koaxial umgibt, deren unterer Endbereich zum Schließen und Freigeben von Einspritzöffnungen (12) ausgebildet ist, wobei die äußere Ventilnadel (11) im Betrieb in Abhängigkeit von ihrer Stellung die Zufuhr von Kraftstoff zu dem unteren Endbereich der inneren Ventilnadel (20) freigibt oder drosselt, wobei eine Steuerkammer (35) vorgesehen ist, die im Betrieb von einer Hochdruckleitung (5) für Kraftstoff her gefüllt wird, und wobei ein Steuerventil (40) vorgesehen ist, das für seine Betätigung mit einem Aktor (38) gekoppelt ist und das zur Beeinflussung des Drucks in der Steuerkammer (35) dient, und wobei das obere Ende der äußeren Ventilnadel (11) und der inneren Ventilnadel (20) eine untere Begrenzung der Steuerkammer (35) bildet und die Stellung der Ventilnadeln (11, 20) jeweils in Abhängigkeit vom Druck in ihrem unteren Endbereich und dem Druck in der Steuerkammer (35) hubgesteuert ist, ist dadurch gekennzeichnet, dass die Steuerkammer (35) über eine Zuflussdrossel (61) mit einer bei Betrieb Kraftstoff unter hohem Druck führenden Leitung verbunden ist, dass das Steuerventil (40) als 3/3-Wege-Ventil ausgebildet ist, von dem ein erster Anschluss (51) mit einem Bereich ...A fuel injection device (1) having an injection valve (8) to be supplied with fuel under high pressure, the injection valve (8) having an outer valve needle (11) (or needle or valve piston) which is tubular and an inner valve needle (11). 20) (or needle, valve piston) coaxially surrounds the lower end portion of which is formed to close and release injection ports (12), the outer valve needle (11), in use, depending on its position, supplying fuel to the lower end portion of the inner Valve needle (20) releases or throttles, wherein a control chamber (35) is provided, which is filled in operation by a high-pressure line (5) for fuel ago, and wherein a control valve (40) is provided, which for its operation with an actuator ( 38) is coupled and which serves to influence the pressure in the control chamber (35), and wherein the upper end of the outer valve needle (11) and the inner valve needle (20 ) forms a lower boundary of the control chamber (35) and the position of the valve needles (11, 20) in each case depending on the pressure in its lower end portion and the pressure in the control chamber (35) is stroke controlled, characterized in that the control chamber (35 ) is connected via an inflow throttle (61) with a high-pressure fuel in operation line, that the control valve (40) is designed as a 3/3-way valve, of which a first port (51) with an area .. ,
Description
Die Erfindung betrifft eine Kraftstoff-Einspritzvorrichtung nach dem Oberbegriff des Patentanspruchs 1.The The invention relates to a fuel injection device according to the Preamble of claim 1.
Ein bekannter CR-Injektor mit KVD-Düse der Anmelderin wird über ein 2/3-Wege-Ventil und eine Ablaufsteuerung gesteuert. Die KVD-Düse (KVD = Koaxial-Vario-Düse) hat eine so genannte erste Ventilnadel oder äußere Ventilnadel, die im wesentlichen die Form eines kreiszylindrischen Hohlzylinders hat und koaxial eine so genannte zweite Ventilnadel oder innere Ventilnadel umgibt, die im wesentlichen bolzenförmig ist und mit ihrem im wesentlichen kegelförmigen unteren Endbereich Einspritzöffnungen für in einen Verbrennungsmotor einzuspritzenden Kraftstoff öffnet beziehungsweise verschließt. Die äußere Ventilnadel dient zur Steuerung des an die innere Ventilnadel gelangenden Drucks des Kraftstoffs. Die zylindrische Außenfläche der inneren Ventilnadel und die zylindrische Innenfläche der äußeren Ventilnadel berühren sich. Die oberen Endflächen der beiden Ventilnadeln bilden Kolbenflächen, die in eine gemeinsame Steuerkammer eingreifen. Die Steuerkammer wird vom CR-Druck her gefüllt (CR-Druck = Common-Rail-Druck). Bei hohem Druck in der Steuerkammer sind die beiden Ventilnadeln in ihrer unteren Endstellung und geschlossen. Wenn der Druck in der Steuerkammer abnimmt, so bewegt sich auf Grund des Flächenverhältnisses der Kolbenflächen der Ventilnadeln in der Steuerkammer und der Flächen der Druckstufen am jeweiligen unteren Ende (unter Berücksichtigung etwa vorhandener, auf die Ventilnadeln wirkender Federn) die äußere Ventilnadel zuerst nach oben und gibt den Druck des Kraftstoffs frei, der somit zu diesem Zeitpunkt zunächst noch von einer Dichtkante der inneren Ventilnadel aufgenommen wird, so dass zunächst noch keine Einspritzung erfolgt. Wenn der Druck in der Steuerkammer weiter abnimmt, so öffnet sich die innere Ventilnadel. Die Steuerung des Drucks in der Steuerkammer erfolgt durch ein Steuerventil, das den Druck in der Steuerkammer durch Ablassen von Kraftstoff über eine Abflussdrossel (A-Drossel) steuert. Das Steuerventil ist bei der bekannten Anordnung ein 2/3-Wege-Ventil.One known CR injector with KVD nozzle the applicant is about a 2/3-way valve and a sequencer controlled. The KVD nozzle (KVD = coaxial Vario nozzle) has a so-called first valve needle or outer valve needle, which is essentially the Has a shape of a circular cylindrical hollow cylinder and coaxial one so-called second valve needle or inner valve needle which surrounds essentially bolt-shaped is and with its substantially conical lower end portion injection openings for in one Internal combustion engine to be injected fuel opens or closes. The outer valve needle serves to control the pressure reaching the inner valve needle of the fuel. The cylindrical outer surface of the inner valve needle and the cylindrical inner surface the outer valve needle touch each other. The upper end surfaces the two valve needles form piston surfaces, which in a common Engage control chamber. The control chamber is filled by the CR pressure (CR pressure = Common rail pressure). At high pressure in the control chamber are the both valve pins in their lower end position and closed. When the pressure in the control chamber decreases, so does move to ground the area ratio the piston surfaces of Valve pins in the control chamber and the surfaces of the pressure stages at the respective lower end (considering approximately existing, acting on the valve needles springs) the outer valve needle First up and releases the pressure of the fuel, thus the at this time initially is received by a sealing edge of the inner valve needle, so that first no injection yet. When the pressure in the control chamber continues to decrease, so opens the inner valve needle. The control of the pressure in the control chamber is done by a control valve that controls the pressure in the control chamber by draining fuel over an outflow throttle (A throttle) controls. The control valve is on the known arrangement a 2/3-way valve.
Bei der bekannten Anordnung wird eine Mehrfachansteuerung für die Einspritzvorrichtung benötigt, um zu verhindern, dass bei einer längeren Ansteuerdauer für eine einzige Zylinderfüllung die innere Ventilnadel zu unerwünschten Zeiten öffnet. Mit der Mehrfachansteuerung wird das Druckniveau in der Steuerkammer künstlich hoch gehalten, so dass die Ventilnadel nicht öffnet.at The known arrangement requires a multiple drive for the injector to to prevent that at a longer driving time for one single cylinder filling the inner valve needle too unwanted Times open. With the multiple control, the pressure level in the control chamber artificially held high, so that the valve needle does not open.
Vorteile der ErfindungAdvantages of invention
Die erfindungsgemäße Einspritzvorrichtung mit den Merkmalen des Patentanspruchs 1 gestattet es durch die Verwendung eines 3/3-Wege-Ventils und einer Reihenschaltung von Drosseln, die zwei Ventilnadeln gestuft mit einer einzigen Ansteuerung zu öffnen.The Inventive injection device with The features of claim 1 allows it by use a 3/3-way valve and a series circuit of chokes, the Two valve needles stepped to open with a single control.
Die Ausführungsform nach Anspruch 2 hat eine einfache zuverlässige Konstruktion.The embodiment according to claim 2 has a simple reliable construction.
Zeichnungdrawing
Ausführungsbeispiele der erfindungsgemäßen Kraftstoffeinspritzvorrichtung sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigtembodiments the fuel injection device according to the invention are shown in the drawings and will be described in the following description explained in more detail. It shows
Beschreibung der Ausführungsbeispieledescription the embodiments
Das
Gehäuse
Der Öffnungsdruck
der inneren Ventilnadel
Das
Steuerventil
Der
Ventilschaft
Zusätzlich weist
das Steuerventil
Die
Wirkungsweise ist wie folgt:
Das Steuerventil
The control valve
Soll
der Druck in der Steuerkammer
Zum
Schließen
beider Ventilnadeln wird das Ventil
Anstatt
des in
Beispielsweise
zeigt
Somit
kann mit der beschriebenen Einspritzvorrichtung ohne Mehrfachansteuerung,
das heißt mit
einer einzigen konstanten Ansteuerung eines als 3/3-Wege-Ventils
ausgebildeten Steuerventils die äußere Ventilnadel
Claims (2)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410030448 DE102004030448A1 (en) | 2004-06-24 | 2004-06-24 | Fuel injector |
PCT/EP2005/051750 WO2006010650A1 (en) | 2004-06-24 | 2005-04-20 | Fuel injection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410030448 DE102004030448A1 (en) | 2004-06-24 | 2004-06-24 | Fuel injector |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102004030448A1 true DE102004030448A1 (en) | 2006-01-12 |
Family
ID=34965492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200410030448 Withdrawn DE102004030448A1 (en) | 2004-06-24 | 2004-06-24 | Fuel injector |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102004030448A1 (en) |
WO (1) | WO2006010650A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5860597A (en) * | 1997-03-24 | 1999-01-19 | Cummins Engine Company, Inc. | Injection rate shaping nozzle assembly for a fuel injector |
DE10122241A1 (en) * | 2001-05-08 | 2002-12-05 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
DE10222208A1 (en) * | 2002-05-18 | 2003-11-27 | Bosch Gmbh Robert | Fuel injection valve for combustion engine, has outer valve needle that is so moved in bore of housing that valve can be kept in intermediate position without resting at stop shoulder of inner valve needle |
DE10300385B3 (en) * | 2003-01-09 | 2004-06-17 | Robert Bosch Gmbh | Fuel injection device for internal combustion engine has 3/3-way valve using high pressure e.g. common-rail pressure, for rapid valve closure |
DE10335211A1 (en) * | 2003-08-01 | 2005-02-17 | Robert Bosch Gmbh | Fuel injection device for an internal combustion engine |
DE10338228A1 (en) * | 2003-08-20 | 2005-03-10 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
DE10338768A1 (en) * | 2003-08-25 | 2005-03-24 | Robert Bosch Gmbh | Fuel injector, for an IC motor, has a hollow sliding needle which controls the outer injection opening(s) at a valve seat and a coaxial sliding valve needle for the inner injection opening(s) |
-
2004
- 2004-06-24 DE DE200410030448 patent/DE102004030448A1/en not_active Withdrawn
-
2005
- 2005-04-20 WO PCT/EP2005/051750 patent/WO2006010650A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2006010650A1 (en) | 2006-02-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |