EP2655866A1 - Laserzündeinrichtung für eine brennkraftmaschine - Google Patents
Laserzündeinrichtung für eine brennkraftmaschineInfo
- Publication number
- EP2655866A1 EP2655866A1 EP11776168.4A EP11776168A EP2655866A1 EP 2655866 A1 EP2655866 A1 EP 2655866A1 EP 11776168 A EP11776168 A EP 11776168A EP 2655866 A1 EP2655866 A1 EP 2655866A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- protective layer
- laser
- ignition device
- laser ignition
- combustion chamber
- 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
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 67
- 239000011241 protective layer Substances 0.000 claims abstract description 62
- 239000007788 liquid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000002745 absorbent Effects 0.000 claims description 3
- 239000002250 absorbent Substances 0.000 claims description 3
- 229920000298 Cellophane Polymers 0.000 claims description 2
- 239000013013 elastic material Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 claims description 2
- 229920006255 plastic film Polymers 0.000 claims description 2
- 239000005871 repellent Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 235000011837 pasties Nutrition 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229920001651 Cyanoacrylate Polymers 0.000 description 1
- 239000004830 Super Glue Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000011990 functional testing Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P23/00—Other ignition
- F02P23/04—Other physical ignition means, e.g. using laser rays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
Definitions
- the invention relates to a laser ignition device for an internal combustion engine comprising an ignition laser with a combustion chamber window and a
- a laser ignition device is known, for example, from WO 2005/0066488 A1.
- the ignition laser has a combustion chamber window which is transparent to the laser pulses emitted by the ignition laser. To protect the combustion chamber window from contamination or damage during operation
- combustion chamber window is not protected in the period between the functional test in production and the first commissioning of the
- the combustion chamber window can be contaminated by unclean work environment in the workshop, impurities in the plug shaft, condensation during the starting process of the cold engine or splash oil from the internal combustion engine. After prolonged periods of inactivity, especially particulate matter or condensation can adversely affect the service life of the combustion chamber window or even result in a malfunction of the laser ignition device.
- the combustion chamber window of an ignition laser is effectively protected against soiling up to the first operation, which adversely affect the service life of the combustion chamber window or even result in a malfunction of the laser ignition system.
- the combustion chamber window by attaching the protective layer according to the invention before longer
- the protective layer in a
- Combustion chamber destroyed and removed together with the exhaust gas from the combustion chamber.
- the protective layer which absorbs the laser pulse.
- the protective layer heats up strongly due to the energy transported by the laser pulse and burns thermally even at the first laser pulses. Subsequent further laser pulses then ignite the fuel-air mixture in the combustion chamber without energy losses.
- the protective layer for the laser pulse is transparent.
- the protective layer burns residue-free together with the fuel. It is also favorable if the protective layer consists of an absorbent material. With the absorbent material, liquid, oily or pasty impurities are absorbed and, together with the protective layer,
- a further embodiment provides that the protective layer
- dirt-repellent material for example, by the so-called
- a protective layer for example a plastic film on the surface of which roll off liquid impurities, is used, only very small amounts of the substances deposit on it and the laser pulse allows the combustion chamber window to run its way on first operation with little energy loss.
- the protective layer consists of an elastic material and this protective film is mounted radially biased on the ignition laser. If the ignition laser now burns a hole in the center of the film, the protective film tears due to its residual stress. The radial bias causes cracking from the inside to the outside and it becomes the adhering to the protective film dirt and the protective film itself to the outside
- a manufacturing technology simple solution is to apply the protective layer as a liquid.
- a liquid can easily be on it
- combustion chamber windows are sprayed or the combustion chamber window is wetted by immersing the ignition laser in the liquid with this.
- the laser ignition system according to the invention works even better when a diaphragm is arranged between the protective layer and the combustion chamber window.
- the protective layer is disposed at a distance from the combustion chamber window, so that it is protected during the burn-off process and second is the
- Laser pulse is greatest at the ignition point, it is ensured that the protective layer burns quickly and residue-free. The greater the distance from the ignition point, the thinner the protective layer should be.
- a further embodiment of the laser ignition system according to the invention provides that the protective layer is arranged in an ignition point. As a result, as already explained above, the secure burning off of the protective layer is ensured.
- a manufacturing technology simple solution is when the protective layer is curved.
- a convex-shaped protective layer By using a convex-shaped protective layer, it is possible in a particularly simple manner to arrange the protective layer in the ignition point. This is the protective layer when attaching or as
- the protective layer is integrated into a pre-chamber cap.
- a pre-chamber cap is the front side at one, the combustion chamber facing the end of the laser ignition device
- Ignition point to arrange. Since in the ignition point the energy density of the laser pulse at largest, burns the protective layer according to the invention with commissioning safely.
- Figure 1 is a schematic representation of an internal combustion engine with a
- FIG. 2 shows a first embodiment of the ignition laser according to the invention
- FIG. 3 shows a second embodiment of the ignition laser according to the invention
- Figure 4 shows a third embodiment of the ignition laser according to the invention
- An internal combustion engine carries the reference numeral 10 in FIG.
- Internal combustion engine 10 comprises a plurality of cylinders, of which only one is represented by the reference numeral 12 in the figure.
- a combustion chamber 14 of the cylinder 12 is limited by a piston 16.
- Fuel enters the combustion chamber 14 directly through an injector 18, which is connected to a fuel supply device 20. Or is in an intake (not shown) with the air premixed.
- the fuel-air mixture 22 is ignited in the combustion chamber 14 by means of a laser pulse 24 in an ignition point ZP.
- the laser pulse 24 is emitted by an ignition laser 26 into the combustion chamber 14.
- the ignition laser 26 is fed via a light guide device 28 from a pumping light source 30.
- a controller 32 controls, among other things, the pumping light source 30 and the injector 18.
- FIG. 2 shows a schematic longitudinal section through the combustion chamber 14 facing the end of the ignition laser 26.
- a housing 34 of the ignition laser 26 is made in two parts. It includes one
- Inner sleeve 36 and an outer sleeve 38 The outer sleeve 38 has at its, the combustion chamber 14 end facing a conclusion 40.
- the end 40 serves to press a combustion chamber window 42 against the inner sleeve 36 and so inner 44 of the inner sleeve 36 and the components (not shown) of the ignition 26, such as a Auslenk- or focusing optics or a laser-active solid against which To seal the combustion chamber 14.
- the outer sleeve 38 is provided with an internal thread which cooperates with a corresponding external thread on the inner sleeve 36.
- the threaded connection consisting of internal thread and external thread is indicated in its entirety by the reference numeral 46.
- the focusing optics focuses the laser pulse 24 to an ignition point ZP.
- the contour of the focused laser pulse 24 is indicated by conical dot-dashed envelope lines 50. These envelope lines 50 exit from the combustion chamber window 42 and intersect at the ignition point ZP.
- the outer sleeve 38 has an aperture 52 on the front side. This can be conical or cylindrical. A cone angle or a diameter of the diaphragm 52 is chosen so that it corresponds approximately to a cone angle or a diameter of the laser pulse 24.
- Membrane is attached to the front side of the outer sleeve 38 so that it closes the aperture 52 until a first start-up of the ignition laser 26 and thus the underlying combustion chamber window 42 from deposits and
- the protective layer 54 may be made of paper, Plastic, metal or rubber. It is also conceivable application of an oily or pasty liquid, which forms a protective layer directly on the combustion chamber window 42 and by the first laser pulse 24 or at
- Burning the fuel-air mixture 22 is burned away.
- FIG. 3 shows a section from the end of the laser ignition device according to the invention facing the combustion chamber 14 in longitudinal section.
- the section shows the combustion chamber window 42 with the end 40 of the outer sleeve 38 arranged in front of it.
- the aperture 52 is inserted in the end 40.
- the envelope lines 50 of the laser pulse 24 pass through the aperture 52 of the
- the protective layer 54 has a curvature, so that a vertex SP of the protective layer 54 lies in the ignition point ZP.
- the arched protective layer 54 can be applied as a prefabricated component or only be formed accordingly during application. For attachment offers in both cases, an adhesive method, for example with superglue.
- FIG. 1 A further embodiment of the laser ignition device according to the invention is shown in FIG.
- the drawing shows a longitudinal section through a
- Antechamber ignition laser 56 Like the previously described embodiments of the ignition laser 26, this includes a combustion chamber window 42 and a termination 40 in which an aperture 52 is arranged, so that the laser pulse 24, indicated by its envelope lines 50, can focus on the ignition point ZP. Furthermore, the prechamber laser spark plug 56 has an end cap 58. This is arranged so that together with the front side of the ignition laser 24 facing the combustion chamber, it forms an antechamber 59 which encloses the ignition point ZP. In the end cap 58 are
- Recesses 60 arranged, which allow a gas exchange of the pre-chamber 59 with the combustion chamber 14.
- the end cap 58 is screwed or welded onto the outer sleeve 38 of the ignition laser 26.
- the protective layer 54 is disposed in the end cap 58 to form a plane between termination 40 and the recesses 60 on which the ignition point ZP lies.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lasers (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010064023A DE102010064023A1 (de) | 2010-12-23 | 2010-12-23 | Laserzündeinrichtung für eine Brennkraftmaschine |
| PCT/EP2011/068906 WO2012084311A1 (de) | 2010-12-23 | 2011-10-27 | Laserzündeinrichtung für eine brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2655866A1 true EP2655866A1 (de) | 2013-10-30 |
| EP2655866B1 EP2655866B1 (de) | 2018-03-07 |
Family
ID=44883249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11776168.4A Not-in-force EP2655866B1 (de) | 2010-12-23 | 2011-10-27 | Laserzündeinrichtung für eine brennkraftmaschine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9347421B2 (de) |
| EP (1) | EP2655866B1 (de) |
| DE (1) | DE102010064023A1 (de) |
| WO (1) | WO2012084311A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008043961A1 (de) * | 2008-11-21 | 2010-05-27 | Robert Bosch Gmbh | Laserinduzierte Fremdzündung für eine Brennkraftmaschine |
| DE102010064023A1 (de) * | 2010-12-23 | 2012-06-28 | Robert Bosch Gmbh | Laserzündeinrichtung für eine Brennkraftmaschine |
| DE112015003101T5 (de) * | 2014-07-02 | 2017-03-30 | Mazda Motor Corporation | Steuergerät eines lasergezündeten motors |
| WO2016093214A1 (ja) | 2014-12-08 | 2016-06-16 | 株式会社デンソー | 点火装置並びにこれに用いられる超親水膜の製造方法 |
| US9574541B2 (en) | 2015-05-27 | 2017-02-21 | Princeton Optronics Inc. | Compact laser ignition device for combustion engine |
| EP3376021B1 (de) * | 2017-03-16 | 2022-05-04 | Ricoh Company, Ltd. | Laservorrichtung und verbrennungsmotor |
| CN113835310A (zh) * | 2021-09-29 | 2021-12-24 | 深圳市先地图像科技有限公司 | 一种光阑以及激光器 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4824495A (en) * | 1987-04-10 | 1989-04-25 | Martin Marietta Corporation | Combustible coatings as protective delay barriers |
| JPH09250438A (ja) * | 1996-03-14 | 1997-09-22 | Mitsubishi Heavy Ind Ltd | エンジン着火装置 |
| DE102004001554A1 (de) | 2004-01-10 | 2005-08-04 | Robert Bosch Gmbh | Vorrichtung zum Zünden einer Brennkraftmaschine |
| DE102005009285B3 (de) * | 2005-02-22 | 2006-09-21 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Fenstervorrichtung und Verwendung einer Fenstervorrichtung für ein Diagnosesystem für Verbrennungsvorgänge und für eine Brennkammer |
| DE102009026794A1 (de) * | 2009-06-05 | 2010-12-09 | Robert Bosch Gmbh | Laserzündeinrichtung |
| RU2362042C1 (ru) | 2008-01-28 | 2009-07-20 | Государственное образовательное учреждение высшего профессионального образования Московский государственный технический университет "МАМИ" | Лазерно-искровая свеча зажигания двигателя внутреннего сгорания |
| JP2010116841A (ja) * | 2008-11-13 | 2010-05-27 | Nippon Soken Inc | レーザ点火装置。 |
| DE102008043961A1 (de) | 2008-11-21 | 2010-05-27 | Robert Bosch Gmbh | Laserinduzierte Fremdzündung für eine Brennkraftmaschine |
| DE102010064023A1 (de) * | 2010-12-23 | 2012-06-28 | Robert Bosch Gmbh | Laserzündeinrichtung für eine Brennkraftmaschine |
-
2010
- 2010-12-23 DE DE102010064023A patent/DE102010064023A1/de not_active Withdrawn
-
2011
- 2011-10-27 EP EP11776168.4A patent/EP2655866B1/de not_active Not-in-force
- 2011-10-27 US US13/996,979 patent/US9347421B2/en not_active Expired - Fee Related
- 2011-10-27 WO PCT/EP2011/068906 patent/WO2012084311A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012084311A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012084311A1 (de) | 2012-06-28 |
| EP2655866B1 (de) | 2018-03-07 |
| DE102010064023A1 (de) | 2012-06-28 |
| US9347421B2 (en) | 2016-05-24 |
| US20130340696A1 (en) | 2013-12-26 |
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