EP1029173B1 - Ventilsteuereinheit für ein kraftstoffeinspritzventil - Google Patents
Ventilsteuereinheit für ein kraftstoffeinspritzventil 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
Links
Images
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
-
- 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
- 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.
Landscapes
- 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
- Fig. 1
- einen Längsschnitt durch eine erfindungsgemäße Ventilsteuereinheit;
- Fig. 2
- einen Längsschnitt durch ein weiteres Endglied eines Ventilsteuerkolbens für eine Ventilsteuereinheit gemäß Figur 1.
Claims (6)
- Ventilsteuereinheit für ein Kraftstoffeinspritzventil, mit zwei miteinander in Verbindung stehenden Ventilsteuerräumen (5, 8), in deren erstem mit einem Zulaufkanal (6) für Kraftstoff verbundenen Ventilsteuerraum (5) ein Endglied (13; 20) eines druckbeaufschlagbaren Ventilsteuerkolbens (3) derart verfahrbar ist, dass der Strömungsquerschnitt für einen Kraftstoffaustausch aus dem ersten Ventilsteuerraum (5) in den zweiten, mit einem verschließbaren Ablaufkanal (9) verbundenen Ventilsteuerraum (8) veränderbar ist, dadurch gekennzeichnet, dass in dem Endglied (13; 20) des Ventilsteuerkolbens (3) ein Drosselkanal (17; 21, 22) für den Kraftstoffaustausch zwischen den Ventilsteuerräumen (5, 8) ausgebildet ist, wobei der Drosselkanal (17; 21, 22) einen gegenüber dem Zulaufkanal (6) verringerten Strömungsquerschnitt aufweist.
- Ventilsteuereinheit nach Anspruch 1, dadurch gekennzeichnet, dass der Drosselkanal (17; 21, 22) quer zur Längsachse des Ventilsteuerkolbens (3) angeordnet ist und sich von einer Außenumfangsfläche (18) des Endglieds (13) des Ventilsteuerkolbens (3) bis zur Stirnseite (14) des Endglieds (13) des Ventilsteuerkolbens (3) erstreckt.
- Ventilsteuereinheit nach Anspruch 1, dadurch gekennzeichnet, dass der Drosselkanal durch einen ersten innerhalb des Endglieds (20) des Ventilsteuerkolbens (3) quer zur Längsachse des Ventilsteuerkolbens (3) verlaufenden Kanalabschnitt (21) und einen zweiten Kanalabschnitt (22) gebildet ist, der mit dem ersten Kanalabschnitt (21) durchgängig verbunden ist und sich in Richtung der Längsachse des Ventilsteuerkolbens (3) bis zur Stirnseite (23) des Endglieds (20) des Ventilsteuerkolbens (3) erstreckt.
- Ventilsteuereinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Randbereiche (16), die den zum ersten Ventilsteuerraum (5) gerichteten Durchgang (7) begrenzen, Anschlagflächen (15) für Gegenflächen des Endglieds (13; 20) des Ventilsteuerkolbens (3) bilden.
- Ventilsteuereinheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich der Ventilsteuerkolben (3) zu seinem Endglied (13; 20) hin verjüngt.
- Ventilsteuereinheit nach Anspruch 5, dadurch gekennzeichnet, dass die Verjüngung in einem stufenartigen Übergang des Ventilsteuerkolbens (3) in einen zylindrischen, zu dem Ventilsteuerkolben (3) koaxialen Endabschnitt mit einem gegenüber dem Ventilsteuerkolben (3) verringerten Außendurchmesser besteht.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19826719 | 1998-06-16 | ||
DE19826719A DE19826719A1 (de) | 1998-06-16 | 1998-06-16 | Ventilsteuereinheit für ein Kraftstoffeinspritzventil |
PCT/DE1999/001661 WO1999066192A1 (de) | 1998-06-16 | 1999-06-08 | Ventilsteuereinheit für ein kraftstoffeinspritzventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1029173A1 EP1029173A1 (de) | 2000-08-23 |
EP1029173B1 true EP1029173B1 (de) | 2003-10-08 |
Family
ID=7871001
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99936421A Expired - Lifetime EP1029173B1 (de) | 1998-06-16 | 1999-06-08 | Ventilsteuereinheit für ein kraftstoffeinspritzventil |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1029173B1 (de) |
JP (1) | JP2002518629A (de) |
KR (1) | KR20010022916A (de) |
DE (2) | DE19826719A1 (de) |
WO (1) | WO1999066192A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19963920B4 (de) * | 1999-12-31 | 2005-01-13 | Robert Bosch Gmbh | Injektor für ein Common-Rail-Kraftstoffeinspritzsystem mit schiebergesteuertem Zulaufkanal und direkter Kopplung von Steuerkolben und Düsenkanal |
DE10033426B4 (de) * | 2000-07-10 | 2004-10-14 | Robert Bosch Gmbh | Injektor/Düsennadel-Kombination mit steuerraumseitiger Kopplung |
WO2002044546A1 (de) * | 2000-11-28 | 2002-06-06 | Siemens Aktiengesellschaft | Steuerraum und steuerkolben für ein enspritzventil einer brennkraftmaschine |
DE10152230A1 (de) * | 2001-10-20 | 2003-04-30 | Bosch Gmbh Robert | Hochdruckfester Injektorkörper |
DE10155406A1 (de) * | 2001-11-10 | 2003-05-22 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
DE10163693A1 (de) * | 2001-12-21 | 2003-07-10 | Orange Gmbh | Einspritzinjektor für Brennkraftmaschinen |
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 |
EP2085604A1 (de) | 2008-02-04 | 2009-08-05 | Robert Bosch GmbH | Injektor zum Einspritzen von Kraftstoff |
DE102009000283A1 (de) | 2008-02-04 | 2009-08-06 | Robert Bosch Gmbh | Injektor zum Einspritzen von Kraftstoff |
DE102012221470A1 (de) * | 2012-11-23 | 2014-05-28 | Robert Bosch Gmbh | Brennstoffeinspritzventil |
EP2808532B1 (de) * | 2013-05-30 | 2017-08-16 | Delphi International Operations Luxembourg S.à r.l. | Kraftstoffeinspritzer |
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 (it) * | 1989-03-03 | 1992-01-23 | Weber Srl | Perfezionamento ai dispositivi di iniezione del combustibile ad azio namento elettromagnetico per motori a ciclo diesel |
IT1250900B (it) * | 1991-12-24 | 1995-04-21 | Elasis Sistema Ricerca Fiat | Valvola di iniezione del combustibile a comando elettromagnetico. |
IT1261149B (it) * | 1993-12-30 | 1996-05-09 | Elasis Sistema Ricerca Fiat | Valvola di dosaggio per il comando dell'otturatore di un iniettore di combustibile |
GB9508623D0 (en) * | 1995-04-28 | 1995-06-14 | Lucas Ind Plc | "Fuel injection nozzle" |
JPH0932683A (ja) * | 1995-07-14 | 1997-02-04 | Isuzu Motors Ltd | 内燃機関の燃料噴射装置 |
-
1998
- 1998-06-16 DE DE19826719A patent/DE19826719A1/de not_active Withdrawn
-
1999
- 1999-06-08 WO PCT/DE1999/001661 patent/WO1999066192A1/de not_active Application Discontinuation
- 1999-06-08 JP JP2000554981A patent/JP2002518629A/ja active Pending
- 1999-06-08 KR KR1020007001521A patent/KR20010022916A/ko not_active Application Discontinuation
- 1999-06-08 DE DE59907284T patent/DE59907284D1/de not_active Expired - Fee Related
- 1999-06-08 EP EP99936421A patent/EP1029173B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE19826719A1 (de) | 1999-12-23 |
DE59907284D1 (de) | 2003-11-13 |
EP1029173A1 (de) | 2000-08-23 |
WO1999066192A1 (de) | 1999-12-23 |
JP2002518629A (ja) | 2002-06-25 |
KR20010022916A (ko) | 2001-03-26 |
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