DE102007002281A1 - Injector for fuel injection system of internal-combustion engine in motor vehicle, has guidance for servo piston designed at separation element and limiting coupler space together with separation element and piston - Google Patents
Injector for fuel injection system of internal-combustion engine in motor vehicle, has guidance for servo piston designed at separation element and limiting coupler space together with separation element and piston Download PDFInfo
- Publication number
- DE102007002281A1 DE102007002281A1 DE200710002281 DE102007002281A DE102007002281A1 DE 102007002281 A1 DE102007002281 A1 DE 102007002281A1 DE 200710002281 DE200710002281 DE 200710002281 DE 102007002281 A DE102007002281 A DE 102007002281A DE 102007002281 A1 DE102007002281 A1 DE 102007002281A1
- Authority
- DE
- Germany
- Prior art keywords
- needle
- piston
- nozzle needle
- nozzle
- section
- 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.)
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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
- 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
- F02M47/025—Hydraulically 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
- 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
- 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
- F02M63/0028—Valves characterised by the valve actuating means hydraulic
- F02M63/0029—Valves characterised by the valve actuating means hydraulic using a pilot valve controlling a hydraulic chamber
-
- 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
- F02M2200/28—Details of throttles in fuel-injection apparatus
-
- 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
Description
Stand der TechnikState of the art
Die Erfindung betrifft einen Injektor für eine Kraftstoffeinspritzanlage einer Brennkraftmaschine, insbesondere in einem Kraftfahrzeug mit den Merkmalen des Oberbegriffs des Anspruchs 1.The The invention relates to an injector for a fuel injection system an internal combustion engine, in particular in a motor vehicle with the features of the preamble of claim 1.
Um möglichst geringe Schadstoffemissionen bei Brennkraftmaschinen erreichen zu können, ist es wichtig, eine gute Durchmischung von Kraftstoff und Luft zu erreichen, wobei die Schadstoffemissionen umso geringer sind, je besser das Kraftstoff-Luft-Gemisch aufbereitet ist. Eine mögliche Form der verbesserten Durchmischung von Kraftstoff während der Einspritzung in einen Brennraum kann beispielsweise durch das Prinzip der sogenannten Koaxial-Vario-Düse realisiert werden.Around lowest possible pollutant emissions from internal combustion engines It is important to get a good mix of fuel and air, with pollutant emissions all the more The better the fuel-air mixture is treated, the lower it is is. A possible form of improved mixing of fuel during injection into a combustion chamber For example, by the principle of the so-called coaxial Vario nozzle will be realized.
Eine
derartige Koaxial-Vario-Düse ist beispielsweise aus der
Weitere
Kraftstoffeinspritzeinrichtungen sind beispielsweise aus der
Nachteilig bei Kraftstoffeinspritzeinrichtungen nach dem Stand der Technik ist insbesondere eine schwierige Ansteuerung der Düsennadeln.adversely in fuel injectors according to the prior art is in particular a difficult control of the nozzle needles.
Vorteile der ErfindungAdvantages of the invention
Der erfindungsgemäße Injektor mit den Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil einer einfachen Ansteuerung von zumindest zwei unterschiedlichen Einspritzöffnungen, welche entweder mit einer als Hohlnadel ausgebildeten, äußeren Düsennadel oder eine koaxial in der äußeren Düsennadel angeordneten inneren Düsennadel zusammenwirken. Die einfache Ansteuerung wird dabei dadurch erreicht, dass in einem Kolbenabschnitt des Injektors ein Servokolben hubverstellbar angeordnet ist, welcher stirnseitig einenends einen Steuerraum und anderenends einen Kopplerraum axial begrenzt. Dieser Servokolben ist in einer an einem zwischen dem Kolbenabschnitt und einem Nadelabschnitt gelegenen Trennelement angeordneten Führung geführt, wobei die Führung zusammen mit dem Trennelement und dem Servokolben den Kopplerraum begrenzt. Um den Kopplerraum mit dem Steuerraum zu verbinden, ist in dem Trennelement eine Durchgangsöffnung vorgesehen. Auf der, dem Kolbenabschnitt abgewandten Seite des Trennelementes, sind oben erwähnte äußere und innere Düsennadeln hubverstellbar angeordnet, wobei eine Steuerung der inneren und/oder der äußeren Düsennadel durch eine Druckerhöhung bzw. eine Druckreduzierung im Nadelsteuerraum, hervorgerufen durch eine Hub- bzw. Senkbewegung des Servokolbens realisiert wird. Die Hub- bzw. Senkbewegung des Servokolbens wiederum wird durch eine Druckerhöhung bzw. eine Druckreduzierung im Steuerraum bewirkt, was beispielsweise über eine Steuereinrichtung, insbesondere über ein 2/2-Magnet-Ventil, sehr einfach zu steuern ist. Durch den erfindungsgemäßen Injektor kann somit eine besonders gute Anpassung der Öffnungscharakteristik zur Verbesserung der Durchmischung des Kraftstoff-Luft-Gemisches erreicht werden, was letztendlich zu geringeren Emissionen der Brennkraftmaschine führt.Of the Inventive injector with the features of Claim 1 has the advantage of a simple contrast Control of at least two different injection openings, which either with a trained as a hollow needle, outer Nozzle needle or coaxial in the outer nozzle needle arranged inner nozzle needle cooperate. The simple one Control is achieved in that in a piston portion of the Injector a servo piston is arranged strokeverstellbar, which at one end a control room and at the other end a coupler room axially limited. This servo piston is in one at an intermediate the piston portion and a needle portion located separating element arranged guided leadership, the leadership together with the separating element and the servo piston the coupler space limited. To connect the coupler room with the control room is provided in the separating element, a passage opening. On the, the piston section opposite side of the separating element, are above-mentioned outer and inner Nozzle needles arranged adjustable in stroke, with a control the inner and / or the outer nozzle needle through an increase in pressure or a pressure reduction in the needle control room, caused by a lifting or lowering movement of the servo piston is realized. The lifting or lowering movement of the servo piston in turn is due to an increase in pressure or a pressure reduction causes in the control room, which, for example via a control device, especially over a 2/2-solenoid valve, very easy to control is. By the injector according to the invention Thus, a particularly good adaptation of the opening characteristics to improve the mixing of the fuel-air mixture be achieved, which ultimately leads to lower emissions of the internal combustion engine leads.
Zweckmäßig ist nadelabschnittseitig am Trennelement und/oder an der inneren Düsennadel und/oder an der äußeren Düsennadel zumindest ein Hubanschlag, beispielsweise in der Art einer Hubanschlagfläche, vorgesehen, welcher einen Nadelhub und damit die Öffnungsbewegung der jeweiligen Nadel begrenzt. Durch Vorsehen eines derartigen Hubanschlages kann die Öffnungscharakteristik der Düsennadeln besonders gut angepasst werden, wodurch sich besonders geringe Emissionen, sowohl an Schadstoffen als auch an Geräuschen, erzielen lassen. Ein derartiger Hubanschlag kann beispielsweise in Form eines mehr oder weniger dicken Abstandselementes ausgebildet sein, wodurch es konstruktiv einfach und damit kostengünstig herzustellen ist.expedient is Nadeladelseitig on the separating element and / or on the inner Nozzle needle and / or on the outer nozzle needle at least one stroke stop, for example in the manner of a stroke stop surface, provided, which a needle stroke and thus the opening movement limited to the respective needle. By providing such Hubanschlages can the opening characteristics of the nozzle needles particularly well adapted, resulting in particularly low emissions, Both pollutants and noises, achieve to let. Such a stroke stop, for example in the form of a be formed more or less thick spacer element, whereby constructively simple and therefore inexpensive to manufacture is.
Bei einer vorteilhaften Weiterbildung der erfindungsgemäßen Lösung kann zwischen einem, den Servokolben umgebenden Hochdruckraum und dem Kopplerraum und/oder dem Nadelsteuerraum eine gedrosselte Verbindung vorgesehen sein. Eine derartige gedrosselte Verbindung kann beispielsweise dazu benutzt werden, die Öffnungs- und Schließgeschwindigkeiten der äußeren und der inneren Düsennadeln zu verlangsamen. Einen ähnlichen Einfluss auf das Öffnungsverhalten wie das des gedrosselten Verbindungspfades zwischen dem Hochdruckraum und dem Nadelsteuerraum kann auch die gedrosselte Verbindung zwischen dem Hochdruckraum und dem Kopplerraum haben. Es lässt sich somit die Öffnungs- bzw. Schließcharakteristik des erfindungsgemäßen Injektors besonders exakt einstellen.In an advantageous development of the solution according to the invention, a throttled connection can be provided between a high pressure space surrounding the servo piston and the coupling space and / or the needle control space. Such a throttled connection can be used, for example, to slow the opening and closing speeds of the outer and inner nozzle needles. A similar influence on the opening behavior as that of the throttled connection path between the high-pressure chamber and the needle control chamber can also ge throttled connection between the high-pressure chamber and the coupler room have. Thus, the opening or closing characteristic of the injector according to the invention can be set particularly precisely.
Weitere wichtige Merkmale und Vorteile des erfindungsgemäßen Injektors ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Further important features and advantages of the invention Injectors emerge from the subclaims, from the Drawings and from the associated figure description based on the drawings.
Zeichnungendrawings
Ausführungsbeispiele des erfindungsgemäßen Injektors sind in den Zeichnungen dargestellt und werden im folgenden näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Komponenten beziehen. Es zeigen, jeweils schematisch,embodiments of the injector according to the invention are in the drawings and are explained in more detail below, where like reference numerals refer to the same or similar or relate functionally identical components. Show, in each case schematically,
Beschreibung der AusführungsbeispieleDescription of the embodiments
Entsprechend
Eine
hydraulische Verbindung besteht darüber hinaus zwischen
dem Steuerraum
Die
beiden Längsenden des Servokolbens
Im
Nadelabschnitt
Betrachtet
man insbesondere die
Im
Nadelsteuerraum
Um
einen Nadelhub der inneren Düsennadel
Bei
der Ausführungsform des erfindungsgemäßen
Injektors
Im
Folgenden soll kurz die Funktionsweise des erfindungsgemäßen
Injektors
Vor einer Aktivierung
des erfindungsgemäßen Injektors
Before activation of the injector according to the invention
Zum
Schließen der Düsennadeln
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 102004015746 A1 [0003] DE 102004015746 A1 [0003]
- - DE 10337609 A1 [0004] - DE 10337609 A1 [0004]
- - DE 10338228 A1 [0004] - DE 10338228 A1 [0004]
- - WO 2004/003374 A1 [0004] WO 2004/003374 A1 [0004]
- - WO 2004/070192 A1 [0004] WO 2004/070192 A1 [0004]
- - WO 2005/068816 A2 [0004] WO 2005/068816 A2 [0004]
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710002281 DE102007002281A1 (en) | 2007-01-16 | 2007-01-16 | Injector for fuel injection system of internal-combustion engine in motor vehicle, has guidance for servo piston designed at separation element and limiting coupler space together with separation element and piston |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710002281 DE102007002281A1 (en) | 2007-01-16 | 2007-01-16 | Injector for fuel injection system of internal-combustion engine in motor vehicle, has guidance for servo piston designed at separation element and limiting coupler space together with separation element and piston |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102007002281A1 true DE102007002281A1 (en) | 2008-07-17 |
Family
ID=39509882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200710002281 Withdrawn DE102007002281A1 (en) | 2007-01-16 | 2007-01-16 | Injector for fuel injection system of internal-combustion engine in motor vehicle, has guidance for servo piston designed at separation element and limiting coupler space together with separation element and piston |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102007002281A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004003374A1 (en) | 2002-06-29 | 2004-01-08 | Robert Bosch Gmbh | Common rail injection system comprising a variable injector and booster device |
WO2004070192A1 (en) | 2003-02-05 | 2004-08-19 | Robert Bosch Gmbh | Fuel injection valve comprising two coaxial valve needles |
DE10338228A1 (en) | 2003-08-20 | 2005-03-10 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
DE10337609A1 (en) | 2003-08-16 | 2005-03-10 | Bosch Gmbh Robert | Fuel injection device, in particular for a direct injection internal combustion engine |
WO2005068816A2 (en) | 2004-01-15 | 2005-07-28 | Robert Bosch Gmbh | Valve for controlling liquids, in particular a fuel injection valve |
DE102004015746A1 (en) | 2004-03-31 | 2005-10-13 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engine has pressure chamber with volume variable through movement of at least one of two nozzle needles so that pressure chamber applies additional force on at least one nozzle needle |
-
2007
- 2007-01-16 DE DE200710002281 patent/DE102007002281A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004003374A1 (en) | 2002-06-29 | 2004-01-08 | Robert Bosch Gmbh | Common rail injection system comprising a variable injector and booster device |
WO2004070192A1 (en) | 2003-02-05 | 2004-08-19 | Robert Bosch Gmbh | Fuel injection valve comprising two coaxial valve needles |
DE10337609A1 (en) | 2003-08-16 | 2005-03-10 | Bosch Gmbh Robert | Fuel injection device, in particular for a direct injection internal combustion engine |
DE10338228A1 (en) | 2003-08-20 | 2005-03-10 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
WO2005068816A2 (en) | 2004-01-15 | 2005-07-28 | Robert Bosch Gmbh | Valve for controlling liquids, in particular a fuel injection valve |
DE102004015746A1 (en) | 2004-03-31 | 2005-10-13 | Robert Bosch Gmbh | Fuel injection valve for internal combustion engine has pressure chamber with volume variable through movement of at least one of two nozzle needles so that pressure chamber applies additional force on at least one nozzle needle |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R005 | Application deemed withdrawn due to failure to request examination |
Effective date: 20140117 |