EP1511934B1 - Injektor zum einspritzen von kraftstoff - Google Patents
Injektor zum einspritzen von kraftstoff Download PDFInfo
- Publication number
- EP1511934B1 EP1511934B1 EP03756968A EP03756968A EP1511934B1 EP 1511934 B1 EP1511934 B1 EP 1511934B1 EP 03756968 A EP03756968 A EP 03756968A EP 03756968 A EP03756968 A EP 03756968A EP 1511934 B1 EP1511934 B1 EP 1511934B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diameter
- inlet
- outlet
- injector according
- spray orifice
- 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 - Fee Related
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
- 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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1846—Dimensional characteristics of 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
- 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
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1806—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for characterised by the arrangement of discharge orifices, e.g. orientation or size
- F02M61/1833—Discharge orifices having changing cross sections, e.g. being divergent
-
- 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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/007—Cleaning
- F02M65/008—Cleaning of injectors only
Definitions
- the present invention relates to an injector for injection of fuel in a combustion chamber of an internal combustion engine through at least one spray hole.
- injectors for injecting fuel in a combustion chamber are injection holes, through which the fuel is injected into the combustion chamber, usually cylindrical educated. So far, here were one or two Spray holes provided. For an improved exhaust behavior To achieve the internal combustion engine has been proposed, the To manufacture injection holes of smaller diameter and at the same time increase the number of spray holes. extensive However, motor investigations have shown that when using contaminated fuel, which for example an increased concentration of co-formulants like Zinc, copper, etc. as well as their compounds contains deposits (Coking) at the outlet opening of the spray holes form. This will cause the flow through the spray holes decreases, so that the injection quantity decreases in the engine and the power of the engine thus continuously decreases. This problem occurs especially at large and maximum Load conditions where very high temperatures prevail.
- the document DE 198 54 828 A1 discloses an injector for injecting of fuel in a combustion chamber known which at least one injection hole with an inlet opening and a Has outlet opening.
- the injection hole cross section expands facing outward in the direction of the valve seat surface Page, d. H. towards the combustion chamber of the internal combustion engine, which makes it possible already in the injection port to generate a cavitation or turbulence, so that the Fuel jet significantly closer to the nozzle decays.
- each injection hole with a device for the targeted generation of cavitation provided at the outlet opening to be stored in operation Remove deposits or the formation of deposits to prevent.
- the invention is thus aware of cavitation generated, i. it will be deliberately steam bubbles at the injection hole generated by falling below the vapor pressure, which then targeted at the outlet of the injection hole, where the unwanted deposits occur to be imploded. in this connection arise at these points pressure waves of several thousand bar, whereby the spray holes freed of deposits or a deposit is prevented from the beginning.
- a device for self-cleaning the outlet openings of the spray nozzles are provided.
- the device for targeted production cavitation by design of the geometric dimensions the injection hole integrated into the injection hole.
- the injection hole shape is somewhat unfavorable in terms of flow designed so that to a certain extent a targeted cavitation occurs.
- This is a flow-related Cavitation achieved by virtue of the shape the spray hole the flow is no longer able to follow the given geometry of the injection hole, so that cavitation occurs.
- the injection hole has on average a barrel-like shape on. Under a barrel-like shape according to the invention thereby a form understood, which is in the direction of flow first expanded and then rejuvenated. hereby can by simple geometric design of the spray hole the imploding of the cavitation bubbles to the outlet opening of the spray hole are laid to the unwanted deposits to avoid.
- the injection hole preferably has a symmetrical Barrel shape up. More preferably, the inlet cross-sectional area the barrel-shaped injection run greater or equal the outlet cross-sectional area. Further preferred are the inlet cross-sectional area and the outlet cross-sectional area respectively circular, wherein an inlet diameter is equal to or larger than an outlet diameter.
- the ratio of the inlet diameter to a maximum Diameter of the barrel-shaped injection hole between 0.9 and 0.95. It is at a ratio inlet diameter to maximum diameter of the barrel-shaped injection hole of 0.91 a safe prevention of deposits possible.
- the inlet diameter is between 5 ⁇ m to 25 ⁇ m smaller than the maximum diameter of the barrel Injection port. At a difference of the inlet diameter to the maximum diameter of at least 10 microns can deposits safely prevented. Further preferred is Ratio of the inlet diameter to the outlet diameter of the barrel-shaped injection hole between 1 and 1.3, in particular at 1.1.
- the injection hole is the ratio of the injection hole length to a mean diameter of the spray hole less than or equal 6.5.
- the average diameter is the average Diameter over the length of the spray hole.
- Invention can the coking tendency of the spray hole thereby be reduced, that at the outlet opening a sharp edge is formed. That is, at the outlet port no rounding of the edge is made, so that one sharp transition between the spray hole and the combustion chamber is available. This sharp transition prevents deposition co-formulants while ensuring that that cavitation bubbles occur at the injection hole edge and there can implode.
- the present invention can be used both with injectors Seat hole nozzles (VCO) as well as injectors with blind hole nozzles be used.
- VCO Vehicle Operator
- injectors with blind hole nozzles be used.
- the injection hole 1 has a symmetrical barrel shape.
- the injection hole 1 is symmetrical both to a plane containing the center axis of the spray hole as well as in a plane imaginary by the maximum diameter D max of the injection hole 1 level.
- the injection hole 1 has an inlet opening 2 and an outlet opening 3.
- the diameter D A of the inlet port 2 equal to the diameter D of the outlet opening 3, wherein the openings 2, 3 are circular.
- the injection hole 1 is in a known manner in a nozzle body 6 formed and at an injection-side end of a blind hole arranged.
- the blind hole comprises a valve seat surface, which released by means of a valve needle or is closed to perform an injection.
- the fuel enters the injection port at the inlet port 2 1 and flows from the outlet port 3 in a Combustion chamber 10 of an internal combustion engine a.
- the maximum diameter D max of the injection hole 1 is arranged at half the length L / 2 of the total length L of the injection hole.
- the ratio of the inlet diameter D Ein to the maximum diameter D max is 0.91. Since the inlet diameter D equal to the outlet diameter D A is Off, the ratio of inlet diameter to outlet diameter. 1
- the flow direction and the deflections at the injection hole 1 of the flow are indicated by the arrows in the figure. Due to the geometric shaping of the injection hole in barrel form, a strong deflection of the flow is generated at the inlet opening 2, so that cavitation bubbles 7 are formed.
- the inlet edge 4 of the inlet opening 2 is rounded with a predetermined radius R.
- the resulting cavitation bubbles 7 are entrained by the flow. Due to the large pressure differences in the injection hole 1, the cavitation bubbles implode, which is indicated in the figures by the reference numeral 8.
- the outlet opening 3 is freed from the deposits 9 occurring there.
- a self-cleaning of the injection hole 1 is possible.
- the inclination of the cavitation bubbles 7 for imploding at the outlet opening 3 can also be adjusted in a targeted manner by forming a sharp outlet edge 5.
- the outlet edge 5 is formed as a sharp edge.
- the injection hole 1 according to the second embodiment substantially corresponds to the first embodiment, with the difference that it is formed only symmetrically with respect to a plane through the center axis of the injection hole and asymmetrical with respect to a level equal to the length L / 2 of the wall thickness L of the nozzle body 6.
- the maximum diameter D max of the barrel-shaped injection hole 1 according to the second embodiment is arranged between the inlet opening 2 and the half length L / 2 of the injection hole 1 (see FIG.
- the ratio of the inlet diameter D Ein to the maximum diameter D max is 0.94. Further, the ratio of the inlet diameter D. A to the outlet diameter D of 1.05. Otherwise, this embodiment corresponds to the first embodiment, so that reference may be made to the description there.
- this is between the outer surface the nozzle body 6 and the injection hole 1 at the outlet opening 3 an outlet edge 5 is formed at an angle ⁇ , so that a sharp-edged transition from the spray hole to the combustion chamber 10 results.
- the injection hole is 1 widening in the direction of flow, more precisely conically widening, formed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- Figur 1
- eine schematische Schnittansicht eines Spritzlochs gemäß einem ersten Ausführungsbeispiel der vorliegenden Erfindung,
- Figur 2
- eine vergrößerte Ansicht der Auslasskante des Spritzlochs von Figur 1,
- Figur 3
- eine schematische Schnittansicht eines Spritzlochs gemäß einem zweiten Ausführungsbeispiel der vorliegenden Erfindung und
- Figur 4
- eine schematische Schnittansicht eines Spritzlochs gemäß einem nicht erfindungsgemäßen Beispiel.
Claims (9)
- Injektor zum Einspritzen von Kraftstoff in einen Brennraum (10) durch wenigstens ein Spritzloch (1) mit einer Einlassöffnung (2) und einer Auslassöffnung (3), wobei das Spritzloch (1) eine Einrichtung zur gezielten Erzeugung von Kavitation an der Auslassöffnung (3) aufweist, um im Betrieb auftretenden Ablagerungen (9) an der Auslassöffnung (3) zu entfernen, wobei
die Einrichtung zur gezielten Erzeugung von Kavitation durch spezielle geometrische Ausbildung der Form des Einspritzlochs in das Einspritzloch integriert ist,
dadurch gekennzeichnet, dass das Spritzloch (1) eine im Schnitt tonnenartige Form aufweist, welcher sich in Durchflussrichtung erst erweitert und dann wieder verjüngt. - Injektor nach Anspruch 1, dadurch gekennzeichnet, dass eine Einlassquerschnittsfläche des tonnenförmigen Spritzlochs (1) größer oder gleich einer Auslassquerschnittsfläche ist.
- Injektor nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Spritzloch (1) eine symmetrische Tonnenform aufweist.
- Injektor nach Anspruch 3, dadurch gekennzeichnet, dass die Einlassquerschnittsfläche und die Auslassquerschnittsfläche kreisförmig sind und ein Einlassdurchmesser (DEin) gleich einem Auslassdurchmesser (DAus) ist.
- Injektor nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass ein Verhältnis des Einlassdurchmessers (DEin) zu einem maximalen Durchmesser (Dmax) des Spritzlochs (1) zwischen 0,9 und 0,95, insbesondere bei 0,91, liegt.
- Injektor nach einem der Ansprüche 1 bis4, dadurch gekennzeichnet, dass der Einlassdurchmesser (DEin) zwischen 5 µm bis 25 µm kleiner, insbesondere um 10 µm kleiner, als der maximale Durchmesser (DMAX) ist.
- Injektor nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, dass das Verhältnis des Einlassdurchmessers (DEin) zum Auslassdurchmesser (DAus) zwischen 1 und 1,1, insbesondere bei 1,05, liegt.
- Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Verhältnis der Spritzlochlänge (L) zu einem mittleren Durchmesser kleiner oder gleich 6,5 ist, wobei der mittlere Durchmesser ein durchschnittlicher Durchmesser über die Länge (L) des Spritzlochs (1) ist.
- Injektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass an der Auslassöffnung (3) eine scharfe Kante (5) ausgebildet ist und an der Kante (4) der Einlassöffnung (2) eine vorbestimmte Verrundung (R) ausgebildet ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002125683 DE10225683A1 (de) | 2002-06-10 | 2002-06-10 | Injektor zum Einspritzen von Kraftstoff |
DE10225683 | 2002-06-10 | ||
PCT/DE2003/001879 WO2003104640A1 (de) | 2002-06-10 | 2003-06-03 | Injektor zum einspritzen von kraftstoff |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1511934A1 EP1511934A1 (de) | 2005-03-09 |
EP1511934B1 true EP1511934B1 (de) | 2005-12-07 |
Family
ID=29718925
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03756968A Expired - Fee Related EP1511934B1 (de) | 2002-06-10 | 2003-06-03 | Injektor zum einspritzen von kraftstoff |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1511934B1 (de) |
JP (1) | JP4288233B2 (de) |
DE (2) | DE10225683A1 (de) |
WO (1) | WO2003104640A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE502007005272D1 (de) * | 2006-08-29 | 2010-11-18 | Continental Automotive Gmbh | Verfahren zur reduzierung von ablagerungen innerhalb eines spritzlochs einer kraftstoffeinspritzvorrichtung |
DE102008055069A1 (de) * | 2008-12-22 | 2010-07-01 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für Brennkraftmaschinen |
DE102009009796B3 (de) * | 2009-02-20 | 2010-10-07 | L'orange Gmbh | Verfahren zur Diagnose und/oder Steuerung von Brennkraftmaschinen, insbesondere Diesel-Brennkraftmaschinen |
JP5392026B2 (ja) * | 2009-11-24 | 2014-01-22 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP5830891B2 (ja) * | 2011-03-25 | 2015-12-09 | トヨタ自動車株式会社 | 燃料噴射弁 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2921455A1 (de) * | 1979-05-26 | 1980-11-27 | Daimler Benz Ag | Kraftstoffeinspritzventil fuer luftverdichtende einspritzbrennkraftmaschinen |
DE19854828A1 (de) * | 1998-11-27 | 2000-05-31 | Bosch Gmbh Robert | Kraftstoffeinspritzdüse für selbstzündende Brennkraftmaschinen |
DE10116714A1 (de) * | 2001-04-04 | 2002-10-10 | Volkswagen Ag | Kraftstoffeinspritzventil für Brennkraftmaschinen, vorzugsweise für hohe Strahlgeschwindigkeiten |
-
2002
- 2002-06-10 DE DE2002125683 patent/DE10225683A1/de not_active Ceased
-
2003
- 2003-06-03 WO PCT/DE2003/001879 patent/WO2003104640A1/de active IP Right Grant
- 2003-06-03 EP EP03756968A patent/EP1511934B1/de not_active Expired - Fee Related
- 2003-06-03 JP JP2004511686A patent/JP4288233B2/ja not_active Expired - Fee Related
- 2003-06-03 DE DE50301874T patent/DE50301874D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO2003104640A1 (de) | 2003-12-18 |
JP2005534844A (ja) | 2005-11-17 |
DE10225683A1 (de) | 2004-01-08 |
EP1511934A1 (de) | 2005-03-09 |
DE50301874D1 (de) | 2006-01-12 |
JP4288233B2 (ja) | 2009-07-01 |
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