WO2003104640A1 - Injektor zum einspritzen von kraftstoff - Google Patents
Injektor zum einspritzen von kraftstoff Download PDFInfo
- Publication number
- WO2003104640A1 WO2003104640A1 PCT/DE2003/001879 DE0301879W WO03104640A1 WO 2003104640 A1 WO2003104640 A1 WO 2003104640A1 DE 0301879 W DE0301879 W DE 0301879W WO 03104640 A1 WO03104640 A1 WO 03104640A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spray hole
- diameter
- injector according
- inlet
- outlet
- 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.)
- Ceased
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
- 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 injecting fuel into a combustion chamber of an internal combustion engine through at least one spray hole.
- injection holes through which the fuel is injected into the combustion chamber are usually cylindrical. So far, one or two spray holes have been provided. In order to achieve an improved exhaust gas behavior of the internal combustion engine, it has been proposed to make the spray holes with a smaller diameter and at the same time to increase the number of spray holes.
- extensive engine tests have shown that when contaminated fuel is used, which contains, for example, an increased concentration of co-formulants such as zinc, copper, etc. and their compounds, deposits (coking) form at the outlet opening of the spray holes. This will reduce the flow through the spray holes, reducing the amount of fuel injected into the engine and continually decreasing the performance of the engine. This problem occurs particularly in large and maximum load conditions where the temperatures are very high.
- each spray hole with a device for the targeted generation of cavitation at the outlet opening in order to remove deposits which have accumulated during operation or to prevent the deposits from forming.
- cavitation is therefore deliberately generated, that is to say, vapor bubbles are generated in a targeted manner at the spray hole by falling below the vapor pressure, which are then brought to implode specifically at the outlet of the spray hole, where the undesired deposits occur. This creates pressure waves of several thousand bar at these points, which clears the spray holes of deposits or prevents deposits from the start.
- a device for self-cleaning the outlet openings of the spray nozzles can be provided.
- the device for the targeted generation of cavitation is particularly preferably integrated into the spray hole by designing the geometric dimensions of the spray hole.
- the shape of the spray hole is fluidically less favorable, so that to a certain extent targeted cavitation occurs.
- Flow-related cavitation is achieved in that, due to the shape of the spray hole, the flow is no longer able to follow the predetermined geometry of the injection hole, so that cavitation occurs.
- the spray hole has a barrel-like shape in section.
- a barrel-like shape is understood to mean a shape which first widens in the flow direction and then tapers again.
- the imploding of the cavitation bubbles can be placed on the outlet opening of the spray hole by simple geometric design of the spray hole in order to prevent the undesired depositing. to avoid problems.
- the spray hole preferably has a symmetrical barrel shape.
- the inlet cross-sectional area of the barrel-shaped injection run is further preferably greater than or equal to the outlet cross-sectional area.
- the inlet cross-sectional area and the outlet cross-sectional area are each circular, an inlet diameter being equal to or greater than an outlet diameter.
- the ratio of the inlet diameter to a maximum diameter of the barrel-shaped spray hole is preferably between 0.9 and 0.95. With a ratio of the inlet diameter to the maximum diameter of the barrel-shaped spray hole of 0.91, deposits can be reliably prevented.
- the inlet diameter is particularly advantageously between 5 .mu.m to 25 .mu.m smaller than the maximum diameter of the barrel-shaped spray hole. If the inlet diameter differs from the maximum diameter by at least 10 ⁇ , deposits can be reliably prevented.
- the ratio of the inlet diameter to the outlet diameter of the barrel-shaped spray hole is furthermore preferably between 1 and 1.3, in particular at 1.1.
- Another preferred shape of the spray hole is when the spray hole has a shape that widens in the flow direction, in particular conically widens.
- the ratio of the spray hole length to an average diameter of the spray hole is less than or equal to 6.5.
- the average diameter is the average diameter over the length of the spray hole.
- the tendency towards coking of the spray hole can be reduced in that a sharp edge is formed at the outlet opening.
- the present invention can be used with injectors
- VCO Vehicle-to-air injectors with blind hole nozzles
- FIG. 1 shows a schematic sectional view of a spray hole according to a first exemplary embodiment of the present invention
- FIG. 2 shows an enlarged view of the outlet edge of the spray hole from FIG. 1,
- Figure 3 is a schematic sectional view of a spray hole according to a second embodiment of the present invention.
- Figure 4 is a schematic sectional view of a spray hole according to a third embodiment of the present invention.
- a spray hole 1 according to a first exemplary embodiment of the present invention is described below with reference to FIGS. 1 and 2.
- the spray hole 1 has a symmetrical barrel shape.
- the spray hole 1 is both symmetrical to a plane containing the central axis of the spray hole and symmetrical in a plane intended by the maximum diameter D max of the spray hole 1.
- the spray 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 spray hole 1 is formed in a known manner in a nozzle body 6 and is arranged on an injection-side end of a blind hole.
- the blind hole comprises a valve seat surface, which is released or closed by means of a valve needle in order to carry out an injection.
- the fuel enters the spray hole 1 at the inlet opening 2 and flows out of the outlet opening 3 into a combustion chamber 10 of an internal combustion engine.
- the maximum diameter D max of the spray hole 1 is arranged at half the length L / 2 of the total length L of the spray hole.
- the ratio of the inlet diameter D Ein to the maximum diameter D ma ⁇ 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 direction of flow and the deflections at the spray hole 1 of the flow are indicated by the arrows in the figure.
- the geometric shaping of the spray hole in barrel shape causes a strong deflection of the flow at the inlet opening 2, so that cavitation bubbles 7 are created.
- the inlet edge 4 of the inlet opening 2 is rounded with a predetermined radius R.
- the tendency to cavitation is specifically increased by influencing the pressure and flow velocity.
- the resulting cavitation bubbles 7 are carried away by the flow.
- the cavitation bubbles implode due to the large pressure differences in the spray hole 1, which is identified in the figures by the reference symbol 8.
- a spray hole 1 according to a second exemplary embodiment of the present invention is described below with reference to FIG. 3. The same parts are identified with the same reference numerals as in the first exemplary embodiment.
- the spray hole 1 according to the second exemplary embodiment essentially corresponds to the first exemplary embodiment, with the difference that it is formed only symmetrically with respect to a plane through the central axis of the spray hole and asymmetrically with respect to a plane at the height L / 2 of the wall thickness L of the nozzle body 6.
- the maximum diameter D max of the barrel-shaped spray hole 1 according to the second exemplary embodiment is arranged between the inlet opening 2 and half the length L / 2 of the spray hole 1 (cf. FIG. 3).
- the ratio of the diameter D Einlass carefully- A to the maximum diameter D max amounts to 0.94.
- the ratio of the inlet diameter D E i, n is the outlet diameter D of 1.05. Otherwise, this exemplary embodiment corresponds to the first exemplary embodiment, so that reference can be made to the description there.
- a third exemplary embodiment according to the present invention is described below with reference to FIG. 4, parts being identified with the same reference numerals as in the previous exemplary embodiments.
- an outlet edge 5 with an angle ⁇ is formed between the outer surface of the nozzle body 6 and the spray hole 1 at the outlet opening 3, so that there is a sharp-edged transition from the spray hole to the combustion chamber 10.
- the spray hole 1 according to the fourth exemplary embodiment is designed to widen in the direction of flow, more precisely to widen conically.
- cavitation bubbles 7 are generated at the inlet opening, which cavitate as a result of the pressure increase when exiting the spray hole 1, so that any deposits 9 which may be present can be removed by means of the imploding cavitation bubbles 8.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03756968A EP1511934B1 (de) | 2002-06-10 | 2003-06-03 | Injektor zum einspritzen von kraftstoff |
| JP2004511686A JP4288233B2 (ja) | 2002-06-10 | 2003-06-03 | 燃料噴射用インジェクタ |
| DE50301874T DE50301874D1 (de) | 2002-06-10 | 2003-06-03 | Injektor zum einspritzen von kraftstoff |
| US11/008,415 US7490784B2 (en) | 2002-06-10 | 2004-12-09 | Injector for injecting fuel |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002125683 DE10225683A1 (de) | 2002-06-10 | 2002-06-10 | Injektor zum Einspritzen von Kraftstoff |
| DE10225683.7 | 2002-06-10 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/008,415 Continuation US7490784B2 (en) | 2002-06-10 | 2004-12-09 | Injector for injecting fuel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003104640A1 true WO2003104640A1 (de) | 2003-12-18 |
Family
ID=29718925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2003/001879 Ceased WO2003104640A1 (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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008025728A3 (de) * | 2006-08-29 | 2008-04-10 | Siemens Vdo Automotive Ag | Verfahren zur reduzierung von ablagerungen innerhalb eines spritzlochs einer kraftstoffeinspritzvorrichtung |
| DE102009009796B3 (de) * | 2009-02-20 | 2010-10-07 | L'orange Gmbh | Verfahren zur Diagnose und/oder Steuerung von Brennkraftmaschinen, insbesondere Diesel-Brennkraftmaschinen |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008055069A1 (de) * | 2008-12-22 | 2010-07-01 | Robert Bosch Gmbh | Kraftstoffeinspritzventil für 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 |
Citations (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 EP EP03756968A patent/EP1511934B1/de not_active Expired - Lifetime
- 2003-06-03 DE DE50301874T patent/DE50301874D1/de not_active Expired - Lifetime
- 2003-06-03 WO PCT/DE2003/001879 patent/WO2003104640A1/de not_active Ceased
- 2003-06-03 JP JP2004511686A patent/JP4288233B2/ja not_active Expired - Fee Related
Patent Citations (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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008025728A3 (de) * | 2006-08-29 | 2008-04-10 | Siemens Vdo Automotive Ag | Verfahren zur reduzierung von ablagerungen innerhalb eines spritzlochs einer kraftstoffeinspritzvorrichtung |
| DE102009009796B3 (de) * | 2009-02-20 | 2010-10-07 | L'orange Gmbh | Verfahren zur Diagnose und/oder Steuerung von Brennkraftmaschinen, insbesondere Diesel-Brennkraftmaschinen |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4288233B2 (ja) | 2009-07-01 |
| DE10225683A1 (de) | 2004-01-08 |
| JP2005534844A (ja) | 2005-11-17 |
| DE50301874D1 (de) | 2006-01-12 |
| EP1511934B1 (de) | 2005-12-07 |
| EP1511934A1 (de) | 2005-03-09 |
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