EP1555425A1 - Einspritzventil - Google Patents
Einspritzventil Download PDFInfo
- Publication number
- EP1555425A1 EP1555425A1 EP04105636A EP04105636A EP1555425A1 EP 1555425 A1 EP1555425 A1 EP 1555425A1 EP 04105636 A EP04105636 A EP 04105636A EP 04105636 A EP04105636 A EP 04105636A EP 1555425 A1 EP1555425 A1 EP 1555425A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle needle
- pressure
- injection valve
- control piston
- control
- 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
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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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/161—Means for adjusting injection-valve lift
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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
- 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
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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
Definitions
- the invention is based on an injection valve of an internal combustion engine according to the preamble of claim 1 more defined type.
- Such an injection valve is known from DE 102 05 970 A1 known and used for injecting fuel into one Combustion chamber of an internal combustion engine.
- the injection valve known from DE 102 05 970 A1 comprises a valve housing in which on the one hand a nozzle module and on the other hand a valve control module is arranged.
- the Nozzle module is designed as a so-called coaxial vario nozzle and includes an outer nozzle needle attached to a valve body is guided, as well as an inner nozzle needle, which in the outer nozzle needle is guided.
- the outer nozzle needle acts on the combustion chamber side with first injection openings or Spray holes together and the inner nozzle needle acts on the combustion chamber side with second injection openings or spray holes together.
- Valve control module that controls a fluid pressure in a valve control chamber prevails and on the injection openings opposite end faces of the two nozzle needles or by control piston of the same acts.
- a pressure change in the valve control room experienced the two nozzle needles an axial offset, depending on the in the valve control room adjusted fluid pressure with the outer nozzle needle co-operating injection holes and possibly also cooperating with the inner nozzle needle Injection openings are released.
- valve control room To set a pressure level in the valve control room this is on the one hand via a so-called inlet throttle with a fuel supply line and on the other hand via a so-called outlet throttle with a valve chamber of the valve control module connected in which one with a valve seat cooperating valve closure member is arranged.
- Opening the valve closing member learns the valve chamber of the Valve control module and thus also to the nozzle needles adjacent valve control chamber a pressure relief, so that the injection openings can be released.
- An opening of the inner nozzle needle takes place in the known Injection valve exclusively depending on the Position of the valve closing member of the valve control module.
- the injection valve according to the invention with the features after the preamble of claim 1, wherein the injection valve the second nozzle needle with a control piston cooperates, facing away from the second nozzle needle End face is subjected to the fuel delivery pressure, wherein the end face is larger than the second pressure surface of second nozzle needle and on the control piston a driver is arranged to open the second nozzle needle with the first nozzle needle cooperates, offers the advantage of a simple, taking place over the needle stroke of the first nozzle needle Control of the second nozzle needle and an opening the second nozzle needle without applying the same with the prevailing in the valve control chamber fluid pressure.
- There one Decoupling of the inner nozzle needle and the outer nozzle needle with respect to the closing direction acting fluid pressure takes place in the valve control room is also an unwanted Opening the inner nozzle needle, especially in the Starting case and excluded over the entire delivery pressure range.
- the injection valve according to the invention can in particular Be part of a common rail injection system and the Fuel injection into a combustion chamber of a diesel internal combustion engine serve a motor vehicle.
- the injection valve for providing the fuel delivery pressure connected to a pressure accumulator, the a so-called common rail forms, which provide for the fuel delivery pressure for all injectors the relevant internal combustion engine is used.
- control piston is a rod with a formed the driver ring collar.
- a Control piston provides a component with a simple Geometry and can easily with the second Nozzle needle be brought into operative connection.
- the injection valve is a for actuating the driver Serving stroke of the first nozzle needle in response to the Fuel delivery pressure adjustable.
- a resilient component is due to the fuel delivery pressure, the on the second nozzle needle facing away from the end face acts, compressible with increasing fuel delivery pressure is.
- the maximum compression of the spring-elastic component is for example a few tenths of a millimeter.
- the driver formed on the control piston a axial offset, so that the first nozzle needle or a Control sleeve of the first nozzle needle depending on the change of Fuel delivery pressure a smaller or larger stroke must run to the driver of the control piston to Plant to come.
- the spring-elastic component can, for example, a Spiral spring, a planar bending element or a compression body be.
- a planar bending element or a compression body have the advantage of being compared to them to a coil spring a small space provided can be.
- an injection valve 10 is shown, the component a so-called common-rail injection system is and to inject fuel into a combustion chamber a diesel internal combustion engine of a motor vehicle serves.
- the injection valve 10 comprises as essential components a nozzle module 12 and only shown in principle Valve control module 14, which in the axial direction of Injector 10 is clamped to the nozzle module 12.
- the valve control module 14 is formed like a valve and represents a 2/2 valve, which is used to control a pressure level in a valve control chamber associated with the nozzle module 12 16 is used.
- the valve control module 14 for example, a piezoelectric actuator, the on a arranged in a valve chamber valve closure member Acts that the valve space of a pressure-relieved return chamber separates.
- the valve control module 14 also operated by means of an electromagnetic actuator be.
- the nozzle module 12 is a so-called coaxial Vario nozzle formed and has an optionally multi-part nozzle housing 18 in which a needle unit from a first, outer nozzle needle 20 and a second inner nozzle needle 22 is arranged.
- the outer nozzle needle 20 acts on its combustion chamber side End with a first row of to the combustion chamber of the internal combustion engine leading injection ports 24 together and is at its end facing away from the combustion chamber over its circumference guided on the nozzle housing 18.
- the inner nozzle needle 22 is in a the outer nozzle needle 20 by cross Axial channel 26 out and acts with her facing the combustion chamber End with a second row from to the combustion chamber the internal combustion engine leading injection openings or Spray holes 28 together.
- the outer nozzle needle 20 is further from an annulus 30, in which a fuel supply line 32nd opens with a high pressure accumulator 34 of the common rail injection system connected, which is a fuel delivery pressure provides.
- the high-pressure accumulator 34 is referred to as Common rail designed to control the fuel delivery pressure for several or all of the internal combustion engine assigned Injectors provides, each according to the executed in Figure 1 shown.
- a serving as an actuator essentially cup-shaped sleeve 34, on which in turn adjoins the valve control chamber 16.
- the valve control chamber 16 is on the one hand via a so-called Inlet throttle 36 with the fuel supply channel 32 and on the other via a so-called outlet throttle 38 with the valve chamber the valve control module 14 is connected.
- the inlet throttle 36 has a smaller diameter than the outlet throttle 38th
- At the outer nozzle needle 20 is at the combustion chamber side End of a first pressure level or surface 40 and on the inner Nozzle needle 22 is at the combustion chamber end of a second pressure stage or surface 42 is formed.
- the inner nozzle needle 22 acts on the spray holes 28 facing away from end face with a coil spring 44 together, also in the axial bore 26 of the outer nozzle needle 20 is inserted and attached to a rigid Washer 46 is supported, which is guided in the sleeve 34 and on which a control piston 48 acts, of which the second nozzle needle 22 remote end face to a control room 50th borders, which is designed as a transverse bore of the housing 18 and which is connected to the fuel supply line 32, so that in him the fuel delivery pressure prevails.
- the the inner nozzle needle 22 facing away from the end face of the control piston 48 is larger than the combustion chamber side arranged Pressure surface 42 of the inner nozzle needle 20th
- the spiral spring 44 is arranged in a spring space 54, the via a discharge line 56 with a return 58th the common rail injection system is connected.
- the control piston 48 is cylindrical and has a ring collar 52, which serves as a driver for the attack of Sleeve 34 is used at a stroke of the outer nozzle needle 20.
- the cylindrical portions of the control piston 48 on both sides of the Driver 52 each have the same diameter.
- the diameter of the control piston 48 on both sides of the driver 52 should be as small and the same size as possible Be as both diameters on the force and thus on the interpretation of acting on the inner nozzle needle 22 Spiral spring impact.
- the control piston 48 passes through the sleeve 34 in its bottom area and the valve control chamber 16, in which also the Driver 52 is arranged.
- the sleeve 34 has of the driver 52 is a distance a corresponding to the stroke that the outer nozzle needle 20 must travel to actuate of the control piston 48 and the inner nozzle needle 22 to trigger.
- the injection valve shown in Figure 1 operates in hereinafter described manner.
- the valve closure member the valve control module 14 is closed, so that a drain of fuel from the valve control chamber 16 via the outlet throttle 38 is locked and in the valve control chamber 16 of the via the inlet throttle 36 acting fuel delivery pressure, d. H. the so-called rail pressure prevails.
- the control room 50 also affects the rail pressure, the inner nozzle needle 22 via the control piston 48, the disc 46 and the coil spring 44 holds in the closed position.
- the in the control room 50th prevailing pressure is always on the current Rail pressure.
- In the spring chamber 54 prevails over the Relief line 56, the so-called return pressure. This prevails in all operating conditions.
- valve control module 14 when the valve control module 14 is actuated, takes place a discharge of the valve control chamber 16 via the outlet throttle 38, whereby the outer nozzle needle 20 through the on the outer pressure stage 40 acting fluid pressure axial Displacement learns and thus to the combustion chamber of the internal combustion engine leading injection openings 24 releases.
- the inner nozzle needle 20 remains closed because the Pressure surface 42, on the open with the outer nozzle needle 20 the rail pressure acts, smaller than that in the control room 50 projecting end face of the control piston 48 is.
- the stroke a of the outer nozzle needle 20 is exclusively of the respective upcoming rail pressure dependent, wherein the Distance a decreases with increasing rail pressure, so that the inner nozzle needle 22 opens faster.
- valve control module 14 again in blocking position is brought, there is a closing of the outlet throttle 38, so that in the valve control chamber 16 via the inlet throttle 36 can rebuild the rail pressure. This causes a closing of the outer nozzle needle 20.
- a schematically indicated driving connection 60 arranged as a paragraph of the outer nozzle needle 20 may be formed.
- the control piston 48, the Disc 46 and the coil spring 44 are by the on the the inner nozzle needle 22 facing away from the end face of the control piston 48 acting fuel delivery pressure to its original position scaled back.
- FIG. 2 shows an alternative embodiment of a connection a control piston 48 to an inner nozzle needle 22nd in an injection valve of the detail shown in Figure 1 Kind shown.
- this is the combustion chamber facing away End of the inner nozzle needle 22 in a for actuating a outer nozzle needle serving sleeve 34 out.
- the one of a spring-elastic component forming planar bending element 64 is covered, for example is made of a spring plate and on which the control piston 48 acts, which passes through the sleeve 34.
- the rail pressure is increased, deformation occurs of the arranged in a spring chamber 54 bending element 64, which yields in the direction of the recess 62.
- FIG. 3 shows a further embodiment of a coupling an inner nozzle needle 22 to a control piston 48th in an injection valve of the detail shown in Figure 1 kind shown.
- the coupling device according to FIG. 3 differs itself from that of Figure 2 in that as a resilient Element between the inner nozzle needle 22nd and the control piston 48, for example, an elastic Plastic existing, in one of the control piston 48 and the inner nozzle needle 22 limited spring space 54 lying compression body is arranged, the at a Increase in rail pressure undergoes compression, so that the stroke of the outer nozzle needle or the sleeve 34, at the sleeve 34 to a driver 52 of the control piston 48th attacks, shrinks. With increasing rail pressure occurs thus an earlier opening of the inner nozzle needle 22nd
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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
Description
Claims (8)
- Einspritzventil einer Brennkraftmaschine, mit einem Düsenmodul (12), in dem eine erste, mit mindestens einer ersten Einspritzöffnung (24) zusammenwirkende Düsennadel (20) und eine zweite, mit mindestens einer zweiten Einspritzöffnung (28) zusammenwirkende, in der ersten Düsennadel (20) geführte Düsennadel (22) axial verschiebbar geführt sind, und mit einem Ventilsteuermodul (14), das einen Fluiddruck steuert, der in einem Ventilsteuerraum (16) zur Ansteuerung der ersten (20) und der zweiten (22) Düsennadel herrscht, wobei an der ersten Düsennadel (20) eine erste Druckfläche (40) und an der zweiten Düsennadel (22) eine zweite Druckfläche (42) ausgebildet ist, auf welche Druckflächen (40, 42) zur Unterstützung einer Öffnung der jeweiligen Düsennadel (20, 22) ein Kraftstoffförderdruck wirkt, dadurch gekennzeichnet, dass die zweite Düsennadel (22) mit einem Steuerkolben (48) zusammenwirkt, dessen der zweiten Düsennadel (22) abgewandte Stirnfläche mit dem Kraftstoffförderdruck beaufschlagt ist, wobei die der zweiten Düsennadel (22) abgewandte Stirnfläche des Steuerkolbens (48) größer ist als die zweite Druckfläche (42) der zweiten Düsennadel (22) und an dem Steuerkolben (48) ein Mitnehmer (52) angeordnet ist, der zum Öffnen der zweiten Düsennadel (22) mit der ersten Düsennadel (20) zusammenwirkt.
- Einspritzventil nach Anspruch 1, dadurch gekennzeichnet, dass der Steuerkolben (48) eine Stange mit einem den Mitnehmer (52) bildenden Ringbund ist.
- Einspritzventil nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Steuerkolben (48) eine Steuerhülse (34) der ersten Düsennadel (20) und den Ventilsteuerraum (16) durchgreift, der an die Steuerhülse (34) grenzt.
- Einspritzventil nach Anspruch 1 bis 3, dadurch gekennzeichnet, dass ein zur Betätigung des Mitnehmers (52) dienender Hub (a) der ersten Düsennadel (20) in Abhängigkeit von dem Kraftstoffförderdruck einstellbar ist.
- Einspritzventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass zwischen dem Steuerkolben (48) und der zweiten Düsennadel (22) ein federelastisches Bauelement (44, 64, 68) angeordnet ist.
- Einspritzventil nach Anspruch 5, dadurch gekennzeichnet, dass das federelastische Bauelement (44, 64, 68) in einem druckentlasteten Federraum (54) angeordnet ist.
- Einspritzventil nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das federelastische Bauelement eine Spiralfeder (44), ein flächiges Biegeelement (64) oder ein Kompressionskörper (54) ist.
- Einspritzventil nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass ein Schließen der zweiten Düsennadel (22) über eine mit der ersten Düsennadel (20) zusammenwirkende Mitnahmeverbindung (60) erfolgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004002082 | 2004-01-15 | ||
DE200410002082 DE102004002082A1 (de) | 2004-01-15 | 2004-01-15 | Einspritzventil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1555425A1 true EP1555425A1 (de) | 2005-07-20 |
EP1555425B1 EP1555425B1 (de) | 2007-06-13 |
Family
ID=34609562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04105636A Ceased EP1555425B1 (de) | 2004-01-15 | 2004-11-09 | Einspritzventil |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1555425B1 (de) |
DE (2) | DE102004002082A1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001241370A (ja) * | 1999-12-22 | 2001-09-07 | Denso Corp | 燃料噴射弁 |
JP2002317727A (ja) * | 2001-04-19 | 2002-10-31 | Toyota Motor Corp | 燃料噴射装置 |
DE10205970A1 (de) | 2002-02-14 | 2003-09-04 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
WO2004083621A1 (de) * | 2003-03-21 | 2004-09-30 | Siemens Aktiengesellschaft | Einspritzventil mit hydraulisch betätigter nadel und hohlnadel und verfahren zum steuern einer einspritzung |
-
2004
- 2004-01-15 DE DE200410002082 patent/DE102004002082A1/de not_active Withdrawn
- 2004-11-09 EP EP04105636A patent/EP1555425B1/de not_active Ceased
- 2004-11-09 DE DE200450004077 patent/DE502004004077D1/de not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001241370A (ja) * | 1999-12-22 | 2001-09-07 | Denso Corp | 燃料噴射弁 |
JP2002317727A (ja) * | 2001-04-19 | 2002-10-31 | Toyota Motor Corp | 燃料噴射装置 |
DE10205970A1 (de) | 2002-02-14 | 2003-09-04 | Bosch Gmbh Robert | Kraftstoffeinspritzventil für Brennkraftmaschinen |
WO2004083621A1 (de) * | 2003-03-21 | 2004-09-30 | Siemens Aktiengesellschaft | Einspritzventil mit hydraulisch betätigter nadel und hohlnadel und verfahren zum steuern einer einspritzung |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 26 1 July 2002 (2002-07-01) * |
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 02 5 February 2003 (2003-02-05) * |
Also Published As
Publication number | Publication date |
---|---|
DE502004004077D1 (de) | 2007-07-26 |
EP1555425B1 (de) | 2007-06-13 |
DE102004002082A1 (de) | 2005-08-04 |
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