EP1029173B1 - Valve control unit for a fuel injection valve - Google Patents
Valve control unit for a fuel injection valve Download PDFInfo
- Publication number
- EP1029173B1 EP1029173B1 EP99936421A EP99936421A EP1029173B1 EP 1029173 B1 EP1029173 B1 EP 1029173B1 EP 99936421 A EP99936421 A EP 99936421A EP 99936421 A EP99936421 A EP 99936421A EP 1029173 B1 EP1029173 B1 EP 1029173B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve control
- control piston
- end member
- valve
- control unit
- 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
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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
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- 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
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- 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
- F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
- F02M2547/008—Means for influencing the flow rate out of or into a control chamber, e.g. depending on the position of the needle
Definitions
- the invention relates to a valve control unit for Fuel injection valve, in particular for a common rail injector, according to the preamble of claim 1.
- Such a valve control unit is, for example, by EP_0_661_442_A1 or EP-A-0 753 659 have become known.
- Valve control units are provided for Pressurization of one end of a slidable to influence the stored valve control piston.
- the other The end of the valve spool can be placed on a nozzle needle act so that the nozzle needle either the Injection opening seals or the exit of Allows fuel from the injection port.
- valve control unit Pressurizing an end member of the valve spool by changing the pressure conditions within a first Valve control room carried out via an inlet channel is connected to a high-pressure accumulator (common rail).
- a drain channel to a second with the first valve control room consistently connected valve control room is connected, open. Therefore, the pressure in the first valve control room drops and thus the hydraulic force on the valve control piston.
- the first valve control chamber disadvantageously only has one small volume so that an opening of the drain channel a quick pressure drop within the first Valve control room results.
- valve control unit therefore only has one small volume of the first valve control space because of the Valve control piston in the area of the passage from the first to the second valve control room at a hydraulic stop (Fuel cushion) is present in this Passage area trained.
- a volume increase would with a hydraulic stop to a disadvantage Vibration behavior of the abutting one Guide the valve control piston.
- the exit of fuel in the second valve control room corresponds to the pressure loss within the Valve control room and only turns after a certain Time to a constant value.
- Valve control piston moves in the direction of the injection opening so that it is closed again. Because of the (with the drain channel open) considerable pressure loss within the first and second valve control spaces Movement of the valve control piston in the direction Injection opening (nozzle needle) only after a certain time reached when there is sufficient pressure within the first valve control room is rebuilt. at The termination of the injection process can therefore Injection opening with the nozzle needle is not high Speed to be closed because of such Movement of the valve control piston is not possible.
- valve control unit for a Fuel injection valve, in particular for a common rail injector, points for a faster closing process the nozzle needle to end the injection process characterizing features of claim 1.
- the fluidic connection between the first and second valve control chamber is through a throttle channel manufactured within the end member of the Valve control piston is formed.
- a throttle channel manufactured within the end member of the Valve control piston is formed.
- Flow guidance of the fuel from a high pressure accumulator (common rail) through the first valve control space in the outlet channel are the inlet channel and the throttle channel in Series connected in series.
- the Forming the throttle channel enables a mechanical Stop of the end member of the valve control piston Edge areas of the passage between the first and second Valve control chamber.
- the end member of the valve control piston can stop there and seal the drain opening so that Fuel only through the throttle channel in the second Valve control room and thus can get into the drain channel.
- the first Valve control room Due to the mechanical stop, the first Valve control room have a large volume without a Vibration behavior of the valve control piston can occur. This trained in comparison to the prior art Volume increase leads to this within the first Valve control room a slow pressure drop takes place. After closing the drain channel, only the pressure has to be increased within the smaller second valve control room the pressurization of the valve spool perform. The valve control piston can move the React the nozzle needle faster.
- valve control unit 1 is in an idle state in which the injection opening is closed, which is not shown in FIG. 1 .
- the valve control unit 1 has a housing body 2, in which a valve control piston 3 is slidably mounted. Above a pressurizable piston surface 4 is a first valve control chamber 5 is formed. About one Inlet channel in the form of an inlet throttle 6 is the first Valve control room 5 with a high pressure accumulator (common rail) connected. With the help of a passage 7 can fuel in reach a second valve control room 8.
- the second Valve control chamber 8 has passage 7 on one opposite end link connects to a Drain channel in the form of a drain throttle 9.
- the Flow restrictor 9 is in the state shown in FIG. 1 closed by a valve ball 10 of a solenoid valve, that is not shown in Figure 1.
- a drain opening 11 releases, fuel can escape in the direction of arrow 12 and fed into a storage container.
- the pressure within the second valve control chamber 8 decreases.
- the Pre-injection can be carried out by means of the valve control unit 1 perform in a known manner.
- the pressure within the first valve control space changes so that a End member of the valve control piston 3 moves such that an end face 14 of the end member 13 on stop faces 15 come from edge areas 16 of the passage 7 to the plant.
- Fuel can flow through a throttle channel in the form of a pass through further inlet throttle 17.
- the inlet throttle 17 extends from an outer peripheral surface 18 of the End member 13 to its end face 14.
- the end member 13 can stop against the edge regions 16 Fuel exchange between the first valve control chamber 5 and the second valve control chamber 8 occur.
- the Inlet throttle 6 and the other inlet throttle 17 are included connected in series.
- the flow inside the inlet throttle 17 is smaller than within the Inlet throttle 6.
- the first valve control chamber 5 is in Connection with the high pressure accumulator and owns inside its volume a pressure that the high pressure accumulator is comparable because a pressure equalization between the Valve control rooms 5 and 8 due to the volume ratio and the flow cross sections of the inlet throttles 6 and 17 can only be done slowly.
- valve control piston 3 Due to the design of the valve control piston 3 in terms of its end member 13 that to the Valve control piston 3 coaxial with reduced Outside diameter is formed, the free volume of the first valve control chamber 5 further enlarge.
- the Volume increase of the valve control room 5 supports in Connection with the mechanical stop the occurrence of a only slow pressure loss within the first Valve control room 5 when opening the drain opening 11. This has a positive effect on the high closing speed of the Valve control piston 3 or a nozzle needle, not shown out.
- FIG. 1 Another embodiment of an end member 20 of the valve control piston 3 is shown in FIG .
- the end member 20 has an inlet throttle 21 which runs transversely to the longitudinal axis of the valve control piston 3 and is connected in a T-shape to a further inlet throttle 22. Due to the entry of fuel into the inlet throttles 21 and 22, fuel can pass from the first valve control chamber 5 into the second valve control chamber 8.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Die Erfindung geht aus von einer Ventilsteuereinheit für ein
Kraftstoffeinspritzventil, insbesondere für einen Commonrail-Injektor,
nach der Gattung des Patentanspruchs 1.The invention relates to a valve control unit for
Fuel injection valve, in particular for a common rail injector,
according to the preamble of
Eine derartige Ventilsteuereinheit ist beispielsweise durch die EP_0_661_442_A1 oder die EP-A-0 753 659 bekanntgeworden.Such a valve control unit is, for example, by EP_0_661_442_A1 or EP-A-0 753 659 have become known.
Ventilsteuereinheiten sind dazu vorgesehen, die Druckbeaufschlagung des einen Endes eines verschieblich gelagerten Ventilsteuerkolbens zu beeinflussen. Das andere Ende des Ventilsteuerkolbens kann auf eine Düsennadel einwirken, so daß die Düsennadel entweder die Einspritzöffnung abdichtet oder aber den Austritt von Kraftstoff aus der Einspritzöffnung zuläßt.Valve control units are provided for Pressurization of one end of a slidable to influence the stored valve control piston. The other The end of the valve spool can be placed on a nozzle needle act so that the nozzle needle either the Injection opening seals or the exit of Allows fuel from the injection port.
Bei der bekannten Ventilsteuereinheit wird die Druckbeaufschlagung eines Endglieds des Ventilsteuerkolbens durch Änderung der Druckverhältnisse innerhalb eines ersten Ventilsteuerraums durchgeführt, der über einen Zulaufkanal mit einem Hochdruckspeicher (common rail) verbunden ist. Beim Ansteuern der Ventilsteuereinheit wird ein Ablaufkanal, der an einen zweiten mit dem ersten Ventilsteuerraum durchgängig verbundenen Ventilsteuerraum angeschlossen ist, geöffnet. Deshalb sinkt der Druck im ersten Ventilsteuerraum und damit die hydraulische Kraft auf den Ventilsteuerkolben. Nachteiligerweise weist der erste Ventilsteuerraum nur ein geringes Volumen auf, so daß eine Öffnung des Ablaufkanals einen schnellen Druckverlust innerhalb des ersten Ventilsteuerraums zur Folge hat. Die bekannte Ventilsteuereinheit weist insbesondere deshalb nur ein geringes Volumen des ersten Ventilsteuerraums auf, weil der Ventilsteuerkolben im Bereich des Durchgangs vom ersten zum zweiten Ventilsteuerraum an einem hydraulischen Anschlag (Kraftstoffpolster) anliegt, der sich in diesem Durchgangsbereich ausbildet. Eine Volumenvergrößerung würde bei einem hydraulischen Anschlag zu einem nachteiligen Schwingungsverhalten des am Anschlag anliegenden Ventilsteuerkolbens führen.In the known valve control unit Pressurizing an end member of the valve spool by changing the pressure conditions within a first Valve control room carried out via an inlet channel is connected to a high-pressure accumulator (common rail). When the valve control unit is activated, a drain channel, to a second with the first valve control room consistently connected valve control room is connected, open. Therefore, the pressure in the first valve control room drops and thus the hydraulic force on the valve control piston. The first valve control chamber disadvantageously only has one small volume so that an opening of the drain channel a quick pressure drop within the first Valve control room results. The well-known In particular, valve control unit therefore only has one small volume of the first valve control space because of the Valve control piston in the area of the passage from the first to the second valve control room at a hydraulic stop (Fuel cushion) is present in this Passage area trained. A volume increase would with a hydraulic stop to a disadvantage Vibration behavior of the abutting one Guide the valve control piston.
Weiterhin ist der Austritt von Kraftstoff (Dieselkraftstoff) aus dem ersten Ventilsteuerraum über den zweiten Ventilsteuerraum in den Ablaufkanal lediglich über einen Spalt im Bereich des hydraulischen Anschlags möglich, indem zwischen dem Endglied des Ventilsteuerkolbens und Randbereichen des Durchgangs zwischen den beiden Steuerräumen Kraftstoff hindurchtreten kann. Der Austritt von Kraftstoff in den zweiten Ventilsteuerraum korrespondiert mit dem Druckverlust innerhalb des Ventilsteuerraums und stellt sich erst nach einer gewissen Zeit auf einen konstanten Wert ein.Furthermore, the leakage of fuel (diesel fuel) from the first valve control room via the second Valve control room in the drain channel via only one Gap in the area of the hydraulic stop possible by between the end member of the valve control piston and Marginal areas of the passage between the two Control rooms fuel can pass through. The exit of fuel in the second valve control room corresponds to the pressure loss within the Valve control room and only turns after a certain Time to a constant value.
Mit Hilfe einer erneuten Ansteuerung der Ventilsteuereinheit wird der Ablaufkanal wieder verschlossen. Durch einen Druckaufbau innerhalb der Ventilsteuerräume kann der Ventilsteuerkolben in Richtung der Einspritzöffnung bewegt werden, so daß diese wieder geschlossen wird. Aufgrund des (bei geöffnetem Ablaufkanal) erheblichen Druckverlustes innerhalb des ersten und zweiten Ventilsteuerraums wird eine Bewegung des Ventilsteuerkolbens in Richtung Einspritzöffnung (Düsennadel) erst nach einer gewissen Zeit erreicht, wenn nämlich ein ausreichender Druck innerhalb des ersten Ventilsteuerraums wieder aufgebaut ist. Bei Beendigung des Einspritzvorgangs kann daher die Einspritzöffnung mittels der Düsennadel nicht mit hoher Geschwindigkeit geschlossen werden, weil eine solche Bewegung des Ventilsteuerkolbens nicht möglich ist.With the help of a new control of the valve control unit the drain channel is closed again. Through a The pressure build-up within the valve control rooms can Valve control piston moves in the direction of the injection opening so that it is closed again. Because of the (with the drain channel open) considerable pressure loss within the first and second valve control spaces Movement of the valve control piston in the direction Injection opening (nozzle needle) only after a certain time reached when there is sufficient pressure within the first valve control room is rebuilt. at The termination of the injection process can therefore Injection opening with the nozzle needle is not high Speed to be closed because of such Movement of the valve control piston is not possible.
Die erfindungsgemäße Ventilsteuereinheit für ein
Kraftstoffeinspritzventil, insbesondere für einen Commonrail-Injektor,
weist für einen schnelleren Schließvorgang
der Düsennadel zur Beendigung des Einspritzvorgangs die
kennzeichnenden Merkmale des Patentanspruchs 1 auf.The valve control unit according to the invention for a
Fuel injection valve, in particular for a common rail injector,
points for a faster closing process
the nozzle needle to end the injection process
characterizing features of
Die strömungstechnische Verbindung zwischen dem ersten und zweiten Ventilsteuerraum wird durch einen Drosselkanal hergestellt, der innerhalb des Endglieds des Ventilsteuerkolbens ausgebildet ist. Hinsichtlich der Strömungsführung des Kraftstoffs von einem Hochdruckspeicher (common rail) durch den ersten Ventilsteuerraum hindurch in den Ablaufkanal sind der Zulaufkanal und der Drosselkanal in Reihe hintereinander geschaltet. Durch den Drosselkanal wird eine definierte Strömung von Kraftstoff zwischen Ventilsteuerräumen und dem Ablaufkanal gewährleistet. Die Ausbildung des Drosselkanals ermöglicht einen mechanischen Anschlag des Endglieds des Ventilsteuerkolbens an Randbereichen des Durchgangs zwischen dem ersten und zweiten Ventilsteuerraum. Das Endglied des Ventilsteuerkolbens kann dort anschlagen und die Ablauföffnung abdichten, so daß Kraftstoff nur über den Drosselkanal in den zweiten Ventilsteuerraum und damit in den Ablaufkanal gelangen kann. Aufgrund des mechanischen Anschlags kann der erste Ventilsteuerraum ein großes Volumen besitzen, ohne daß ein Schwingungsverhalten des Ventilsteuerkolbens auftreten kann. Diese im Vergleich zum Stand der Technik ausgebildete Volumenvergrößerung führt dazu, dazu innerhalb des ersten Ventilsteuerraums ein langsamer Druckabfall stattfindet. Nach Schließen des Ablaufkanals muß lediglich der Druck innerhalb des kleineren zweiten Ventilsteuerraum erhöht werden, um die Druckbeaufschlagung des Ventilsteuerkolbens durchzuführen. Der Ventilsteuerkolbens kann zur Bewegung der Düsennadel schneller reagieren.The fluidic connection between the first and second valve control chamber is through a throttle channel manufactured within the end member of the Valve control piston is formed. With regard to the Flow guidance of the fuel from a high pressure accumulator (common rail) through the first valve control space in the outlet channel are the inlet channel and the throttle channel in Series connected in series. Through the throttle channel a defined flow of fuel between Valve control rooms and the drain channel guaranteed. The Forming the throttle channel enables a mechanical Stop of the end member of the valve control piston Edge areas of the passage between the first and second Valve control chamber. The end member of the valve control piston can stop there and seal the drain opening so that Fuel only through the throttle channel in the second Valve control room and thus can get into the drain channel. Due to the mechanical stop, the first Valve control room have a large volume without a Vibration behavior of the valve control piston can occur. This trained in comparison to the prior art Volume increase leads to this within the first Valve control room a slow pressure drop takes place. After closing the drain channel, only the pressure has to be increased within the smaller second valve control room the pressurization of the valve spool perform. The valve control piston can move the React the nozzle needle faster.
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 The invention relates to the description of the Drawing and the claims can be removed.
Ausführungsbeispiele der erfindungsgemäßen Ventilsteuereinheit sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung erläutert. Embodiments of the invention Valve control unit are shown in the drawing and in the following description explains.
Es zeigen:
- Fig. 1
- einen Längsschnitt durch eine erfindungsgemäße Ventilsteuereinheit;
- Fig. 2
- einen Längsschnitt durch ein weiteres Endglied
eines Ventilsteuerkolbens für eine Ventilsteuereinheit
gemäß
Figur 1.
- Fig. 1
- a longitudinal section through a valve control unit according to the invention;
- Fig. 2
- 2 shows a longitudinal section through a further end member of a valve control piston for a valve control unit according to FIG. 1.
Das Ausführungsbeispiel einer Ventilsteuereinheit 1 befindet
sich in einem Ruhezustand, bei dem die Einspritzöffnung
geschlossen ist, die in der Figur 1 nicht gezeigt ist.The exemplary embodiment of a
Die Ventilsteuereinheit 1 weist einen Gehäusekörper 2 auf,
in dem ein Ventilsteuerkolben 3 verschieblich gelagert ist.
Oberhalb einer druckbeaufschlagbaren Kolbenfläche 4 ist ein
erster Ventilsteuerraum 5 ausgebildet. Über einen
Zulaufkanal in Form einer Zulaufdrossel 6 ist der erste
Ventilsteuerraum 5 mit einem Hochdruckspeicher (common rail)
verbunden. Mit Hilfe eines Durchgangs 7 kann Kraftstoff in
einen zweiten Ventilsteuerraum 8 gelangen. Der zweite
Ventilsteuerraum 8 besitzt an einem dem Durchgang 7
gegenüberliegenden Endglied eine Verbindung zu einem
Ablaufkanal in Form einer Ablaufdrossel 9 . Die
Ablaufdrossel 9 ist im dargestellten Zustand der Figur 1
durch eine Ventilkugel 10 eines Magnetventils geschlossen,
das in der Figur 1 nicht näher dargestellt ist. The
Wenn nun die Ablaufdrossel 9 mit Hilfe des Magnetventils
geöffnet wird, indem die Ventilkugel 10 eine Ablauföffnung
11 freigibt, kann Kraftstoff in Pfeilrichtung 12 austreten
und in ein Vorratsbehältnis geleitet werden. Der Druck
innerhalb des zweiten Ventilsteuerraums 8 nimmt ab. Die
Voreinspritzung läßt sich mittels der Ventilsteuereinheit 1
in bekannter Weise durchführen. Auch der Druck innerhalb des
ersten Ventilsteuerraums ändert sich, so daß sich ein
Endglied des Ventilsteuerkolbens 3 derart verschiebt, daß
eine Stirnfläche 14 des Endglieds 13 an Anschlagflächen 15
von Randbereichen 16 des Durchgangs 7 zur Anlage kommen.
Dabei kann Kraftstoff durch einen Drosselkanal in Form einer
weiteren Zulaufdrossel 17 hindurchtreten. Die Zulaufdrossel
17 erstreckt sich von einer Außenumfangsfläche 18 des
Endglieds 13 bis zu ihrer Stirnseite 14. Trotz eines
Anschlags des Endglieds 13 an den Randbereichen 16 kann ein
Kraftstoffaustausch zwischen dem ersten Ventilsteuerraum 5
und dem zweiten Ventilsteuerraum 8 auftreten. Die
Zulaufdrossel 6 und die weitere Zulaufdrossel 17 sind dabei
hintereinander in Reihe geschaltet. Der Durchfluß innerhalb
der Zulaufdrossel 17 ist dabei kleiner als innerhalb des
Zulaufdrossel 6. Der erste Ventilsteuerraum 5 steht in
Verbindung mit dem Hochdruckspeicher und besitzt innerhalb
seines Volumens einen Druck, der dem Hochdruckspeicher
vergleichbar ist, weil ein Druckausgleich zwischen den
Ventilsteuerräumen 5 und 8 aufgrund der Volumenverhältnisse
und der Strömungsquerschnitte der Zulaufdrosseln 6 und 17
nur langsam erfolgen kann.If now the
Beim Schließen der Einspritzöffnung mittels der
geschlossen. Innerhalb des ersten Ventilsteuerraums 5 ist
nahezu Hochdruck ausgebildet, so daß lediglich der zweite
Ventilsteuerraum 8 mit Hochdruck gefüllt werden muß, damit
der Ventilsteuerkolben 3 in Pfeilrichtung 19 bewegt wird.When closing the injection opening using the
closed. Inside the first
Aufgrund der Ausbildung des Ventilsteuerkolbens 3
hinsichtlich seines Endglieds 13, das zu dem
Ventilsteuerkolben 3 koaxial mit verringertem
Außendurchmesser gebildet ist, läßt sich das freie Volumen
des ersten Ventilsteuerraums 5 weiter vergrößern. Die
Volumenvergrößerung des Ventilsteuerraums 5 unterstützt in
Verbindung mit dem mechanischen Anschlag das Auftreten eines
nur langsamen Druckverlustes innerhalb des ersten
Ventilsteuerraums 5 bei Öffnung der Ablauföffnung 11. Dies
wirkt sich positiv auf eine hohe Schließgeschwindigkeit des
Ventilsteuerkolbens 3 bzw. einer nicht gezeigten Düsennadel
aus.Due to the design of the
In der Figur 2 ist eine andere Ausgestaltung eines Endglieds
20 des Ventilsteuerkolbens 3 gezeigt. Das Endglied 20 weist
eine quer zur Längsachse des Ventilsteuerkolbens 3
verlaufende Zulaufdrossel 21 auf, die T-förmig mit einer
weiteren Zulaufdrossel 22 verbunden ist. Durch den Eintritt
von Kraftstoff in die Zulaufdrosseln 21 bzw. 22 kann
Kraftstoff aus dem ersten Ventilsteuerraum 5 in den zweiten
Ventilsteuerraum 8 gelangen.Another embodiment of an
Claims (6)
- Valve control unit for a fuel injection valve, with two valve control spaces (5, 8) which are connected to one another and in the first valve control space (5) of which, connected to an inflow duct (6) for fuel, an end member (13; 20) of a pressure-loadable valve control piston (3) can be moved in such a way that a flow cross section for an exchange of fuel out of the first valve control space (5) into the second valve control space (8), connected to a closable outflow duct (9), can be varied, characterized in that a throttle duct (17; 21, 22) for the exchange of fuel between the valve control spaces (5, 8) is formed in the end member (13; 20) of the valve control piston (3), the throttle duct (17; 21, 22) having a flow cross section reduced in relation to the inflow duct (6).
- Valve control unit according to Claim 1, characterized in that the throttle duct (17; 21, 22) is arranged transversely to the longitudinal axis of the valve control piston (3) and extends from an outer circumferential surface (18) of the end member (13) of the valve control piston (3) as far as the end face (14) of the end member (13) of the valve control piston (3).
- Valve control unit according to Claim 1, characterized in that the throttle duct is formed by a first duct portion (21) running within the end member (20) of the valve control piston (3) transversely to the longitudinal axis of the valve control piston (3) and by a second duct portion (22) which is connected continuously to the first duct portion (21) which extends in the direction of the longitudinal axis of the valve control piston (3) as far as the end face (23) of the end member (20) of the valve control piston (3).
- Valve control unit according to one of the preceding claims, characterized in that edge regions (16) which delimit the passage (7) directed towards the first valve control space (5) form abutment surfaces (15) for countersurfaces of the end member (13; 20) of the valve control piston (3).
- Valve control unit according to one of the preceding claims, characterized in that the valve control piston (3) narrows towards its end member (13; 20).
- Valve control unit according to Claim 5, characterized in that the narrowing consists of a step-like transition of the valve control piston (3) into a cylindrical end portion coaxial to the valve control piston (3) and having an outside diameter reduced in relation to the valve control piston (3).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19826719A DE19826719A1 (en) | 1998-06-16 | 1998-06-16 | Valve control unit for a fuel injector |
| DE19826719 | 1998-06-16 | ||
| PCT/DE1999/001661 WO1999066192A1 (en) | 1998-06-16 | 1999-06-08 | Valve control unit for a fuel injection valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1029173A1 EP1029173A1 (en) | 2000-08-23 |
| EP1029173B1 true EP1029173B1 (en) | 2003-10-08 |
Family
ID=7871001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99936421A Expired - Lifetime EP1029173B1 (en) | 1998-06-16 | 1999-06-08 | Valve control unit for a fuel injection valve |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1029173B1 (en) |
| JP (1) | JP2002518629A (en) |
| KR (1) | KR20010022916A (en) |
| DE (2) | DE19826719A1 (en) |
| WO (1) | WO1999066192A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| DE10033426B4 (en) * | 2000-07-10 | 2004-10-14 | Robert Bosch Gmbh | Injector / nozzle needle combination with control room coupling |
| WO2002044546A1 (en) * | 2000-11-28 | 2002-06-06 | Siemens Aktiengesellschaft | Control chamber and control plunger for an injection valve of an internal combustion engine |
| DE10152230A1 (en) * | 2001-10-20 | 2003-04-30 | Bosch Gmbh Robert | High pressure resistant injector body |
| DE10155406A1 (en) * | 2001-11-10 | 2003-05-22 | Bosch Gmbh Robert | Fuel injection device for an internal combustion engine |
| DE10163693A1 (en) | 2001-12-21 | 2003-07-10 | Orange Gmbh | Injection injector for internal combustion engines |
| US20060196974A1 (en) * | 2005-03-01 | 2006-09-07 | Caterpillar Inc. | Fuel injector having a gradually restricted drain passageway |
| US7506825B2 (en) | 2006-05-31 | 2009-03-24 | Caterpillar Inc. | Fuel injector control system |
| DE102009000283A1 (en) | 2008-02-04 | 2009-08-06 | Robert Bosch Gmbh | Fuel injector, particularly common-rail injector for injecting fuel into combustion chamber of internal-combustion engine, has sealing edge that is formed at front wall of injection valve element |
| EP2085604A1 (en) | 2008-02-04 | 2009-08-05 | Robert Bosch GmbH | Fuel injector |
| DE102012221470A1 (en) * | 2012-11-23 | 2014-05-28 | Robert Bosch Gmbh | Fuel injector |
| EP2808532B1 (en) * | 2013-05-30 | 2017-08-16 | Delphi International Operations Luxembourg S.à r.l. | Fuel injector |
| GB201402921D0 (en) * | 2014-02-19 | 2014-04-02 | Delphi Int Operations Luxembourg Sarl | Fuel injector |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1232027B (en) * | 1989-03-03 | 1992-01-23 | Weber Srl | IMPROVEMENT IN THE INJECTION DEVICES OF THE ELECTROMAGNETIC FUEL FOR DIESEL CYCLE ENGINES |
| IT1250900B (en) * | 1991-12-24 | 1995-04-21 | Elasis Sistema Ricerca Fiat | ELECTROMAGNETICALLY OPERATED FUEL INJECTION VALVE. |
| IT1261149B (en) * | 1993-12-30 | 1996-05-09 | Elasis Sistema Ricerca Fiat | DOSING VALVE FOR THE CONTROL OF THE SHUTTER OF A FUEL INJECTOR |
| GB9508623D0 (en) * | 1995-04-28 | 1995-06-14 | Lucas Ind Plc | "Fuel injection nozzle" |
| JPH0932683A (en) * | 1995-07-14 | 1997-02-04 | Isuzu Motors Ltd | Fuel injection device of internal combustion engine |
-
1998
- 1998-06-16 DE DE19826719A patent/DE19826719A1/en not_active Withdrawn
-
1999
- 1999-06-08 WO PCT/DE1999/001661 patent/WO1999066192A1/en not_active Application Discontinuation
- 1999-06-08 DE DE59907284T patent/DE59907284D1/en not_active Expired - Fee Related
- 1999-06-08 EP EP99936421A patent/EP1029173B1/en not_active Expired - Lifetime
- 1999-06-08 KR KR1020007001521A patent/KR20010022916A/en not_active Application Discontinuation
- 1999-06-08 JP JP2000554981A patent/JP2002518629A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE59907284D1 (en) | 2003-11-13 |
| KR20010022916A (en) | 2001-03-26 |
| WO1999066192A1 (en) | 1999-12-23 |
| EP1029173A1 (en) | 2000-08-23 |
| JP2002518629A (en) | 2002-06-25 |
| DE19826719A1 (en) | 1999-12-23 |
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