EP1544457A1 - Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor - Google Patents
Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor Download PDFInfo
- Publication number
- EP1544457A1 EP1544457A1 EP04105772A EP04105772A EP1544457A1 EP 1544457 A1 EP1544457 A1 EP 1544457A1 EP 04105772 A EP04105772 A EP 04105772A EP 04105772 A EP04105772 A EP 04105772A EP 1544457 A1 EP1544457 A1 EP 1544457A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- firing pin
- combustion chamber
- fuel mixture
- combustion engine
- air
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 29
- 239000000446 fuel Substances 0.000 title claims abstract description 13
- 239000000203 mixture Substances 0.000 title claims abstract description 13
- 238000010304 firing Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 230000004323 axial length Effects 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 239000004020 conductor Substances 0.000 description 5
- 210000002381 plasma Anatomy 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000012811 non-conductive material Substances 0.000 description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000010909 process residue Substances 0.000 description 1
- 230000003716 rejuvenation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/50—Sparking plugs having means for ionisation of gap
-
- 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
- F02P23/045—Other physical ignition means, e.g. using laser rays using electromagnetic microwaves
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/40—Sparking plugs structurally combined with other devices
Definitions
- the invention relates to a device for igniting an air-fuel mixture in one Internal combustion engine by means of a high - frequency power source according to the preamble of Main claim.
- spark plug represents a common part of internal combustion engines for motor vehicles.
- the spark plug is inductively by means of an ignition coil a sufficiently high electrical voltage is supplied, so that a spark at the end the spark plug in the combustion chamber of the internal combustion engine forms around the combustion of the Air-fuel mixture to initiate.
- this conventional spark plug When operating this conventional spark plug can voltages up to thirty kilovolts occur due to the combustion process residues such as soot, oil or coal as well Ashes of fuel and oil occur under certain thermal conditions electrically are conductive. However, at these high voltages no over- or Breakdowns on the insulator of the spark plug occur, so that the electrical resistance of the Insulator even at the high temperatures occurring during the life of the spark plug should not change.
- the known candle tips have the particular disadvantage that the tip in the Usually with a very small cylindrical diameter, e.g. less than 0.5 mm, is formed. Although this can be a technically achievable maximum field strength, at a given Performance, however, this thin needle-shaped tip of the firing pin is very sensitive to mechanical effects, e.g. by bending during engine installation, so that it should only have a very short length. In addition, here at the operation through the inevitable burning off the life of the spark plug because of the small volume undesirably shortened.
- the candle tip is mechanically more robust, they are sharp and very sharp pointed geometries, e.g. cylindrical with a flat end or a candle tip with a crown shape,
- the following disadvantages in common With increasing operating time, the peaks rounded by the burnup and the amount of field strength maximum goes back with it.
- the tip is mechanically robust and, however, designed without a sharp point at the front, e.g. according to the non-prepublished DE 102 39 412 with a hemisphere, one has over the service life by the erosion no significant change in shape, but it was from the outset waived a possible high field strength amount.
- the invention relates to a device for igniting an air-fuel mixture in an internal combustion engine by means of a high frequency electrical energy source, with a Coaxial waveguide structure, in which the high-frequency electrical energy can be coupled and with one end into the respective combustion chamber of a cylinder of the internal combustion engine protrudes, wherein at this end by a high voltage potential, a microwave plasma can be generated.
- the firing pin according to the mark of Claim 1 is formed so that the firing pin with a at least partially or is provided over the entire axial length extending inner hole.
- the end of the firing pin projecting into the combustion chamber preferably has a cross section in the form of a half-torus ring. But it is also a cross section in the form of a quarter torus ring or a flat design possible.
- Burnup e.g. at a calculated surface ratio of a hemisphere to the half-torus of ca.1,3, the material requirement by the tubular shape but much lower and more expensive and more stable metals or metal alloys can for example, platinum, are used.
- the weight of the spark plug tip is lower, so even with a desired relatively long peak projection mechanical vibration amplitudes (spring-mass system) have significantly smaller values and thus are better in terms of quality.
- FIG. 1 shows a schematic view of a device known per se for high-frequency ignition of an air-fuel mixture in an internal combustion engine, which has components of a so-called high-frequency spark plug 1.
- a device known per se for high-frequency ignition of an air-fuel mixture in an internal combustion engine which has components of a so-called high-frequency spark plug 1.
- an RF generator 2 and possibly also dispensable amplifier 3 available, which generate the high-frequency oscillations as a microwave source.
- an inductive coupling 4 of the high-frequency oscillations is shown in a coaxial waveguide structure constructed as a ⁇ eff / 4 resonator 5 as an essential component of the high-frequency spark plug 1.
- the coaxial line resonator 5 consists of an outer conductor 6 and an inner conductor 7, wherein the one so-called open or hot end 8 of the resonator 5 with an opposite the outer conductor 6 insulated firing pin 12, the ignition causes.
- the other so-called cold combustion chamber remote end 9 of the resonator. 5 a short circuit.
- the dielectric 10 between the outer conductor 6 and the inner conductor 7 consists essentially of air or of a suitable non-conductive material. Only for sealing the open end 8 of the resonator 5 to the combustion chamber is a seal 11 available.
- the seal 11 is also made of a non-conductive material that withstands the temperatures withstand in the combustion chamber, e.g. Ceramics. This is determined by the dielectric properties the filling material 10 or the seal 11 with the dimensions of the resonator. 5
- the principle of field enhancement in a coaxial resonator 5 of length (2n + 1) * ⁇ eff / 4 with n ⁇ O is used.
- the high-frequency signal generated by a sufficiently strong microwave source as a generator 2 and possibly the amplifier 3 is fed by the coupling 4, for example, inductive, capacitive, mixed from the two or through an aperture coupling in the resonator 5.
- the coupling 4 for example, inductive, capacitive, mixed from the two or through an aperture coupling in the resonator 5.
- the embodiment 3 shows a variant with an axially extending over the entire length Inner hole 13 and a Halbtorusring trained top surface 14.
- Das Inner hole 13 can also be at an outer cylindrical shape of the firing pin 12 inside take other forms, for example, an inner hole 13, which is the candle tip 14 rejuvenated.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Spark Plugs (AREA)
Abstract
Description
Claims (7)
- Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor mittels einer hochfrequenten elektrischen Energiequelle, miteiner koaxialen Wellenleiterstruktur, in die die hochfrequente elektrische Energie einkoppelbar ist und die mit einem Ende (8) in den jeweiligen Brennraum eines Zylinders des Verbrennungsmotors hineinragt, wobei an diesem Ende (8) durch ein hohes Spannungspotential ein Mikrowellenplasma erzeugbar ist, dadurch gekennzeichnet, dassdas eine Ende (8) der koaxialen Wellenleiterstruktur (5) als Zündstift (12) so ausgebildet ist, dass bei einem anstehenden Spannungspotential durch eine in den Brennraum hineinragende Feldstruktur ein freistehendes Plasma im Luft-Kraftstoff-Gemisch erzeugbar ist, und dassder Zündstift (12) mit einem sich zumindest teilweise über die axiale Länge erstreckenden Innenloch (13) versehen ist.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dassder Zündstift (12) mit einem sich die gesamte axiale Länge erstreckenden Innenloch (13) versehen ist.
- Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dassdas in den Brennraum hineinragende Ende als Kerzenspitze (14) des Zündstifts (12) einen Querschnitt in Form eines Halbtorusrings aufweist.
- Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dassdas in den Brennraum hineinragende Ende des Zündstifts (12) als Kerzenspitze (14) einen Querschnitt in Form eines Vierteltorusrings aufweist.
- Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dassdas in den Brennraum hineinragende Ende als Kerzenspitze (14) des Zündstifts (12) plan ausgeführt ist.
- Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dassder Zündstift (12) aus einem temperaturstabilen und zunderfesten Material mit relativ hoher elektrischer Leitfähigkeit, wie Platin, hergestellt ist.
- Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dassder Zündstift (12) aus einem temperaturstabilen und zunderfesten Material mit relativ geringer elektrischer Leitfähigkeit hergestellt ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003160192 DE10360192A1 (de) | 2003-12-20 | 2003-12-20 | Vorrrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor |
| DE10360192 | 2003-12-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1544457A1 true EP1544457A1 (de) | 2005-06-22 |
Family
ID=34485559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04105772A Withdrawn EP1544457A1 (de) | 2003-12-20 | 2004-11-15 | Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1544457A1 (de) |
| JP (1) | JP2005180435A (de) |
| DE (1) | DE10360192A1 (de) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7204220B2 (en) * | 2002-08-28 | 2007-04-17 | Robert Bosch Gmbh | Device for igniting an air-fuel mixture in an internal combustion engine by means of a high frequency electric energy source |
| CN102472240A (zh) * | 2009-08-06 | 2012-05-23 | 创想科学技术工程株式会社 | 混合器、匹配器、点火单元、及等离子体发生器 |
| EP2581998A1 (de) * | 2011-10-14 | 2013-04-17 | Delphi Automotive Systems Luxembourg SA | Zündkerze für Hochfrequenz-Zündsystem |
| EP3150841A4 (de) * | 2014-05-29 | 2017-06-21 | Imagineering, Inc. | Injektor mit eingebautem zündsystem |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5578092B2 (ja) * | 2011-01-20 | 2014-08-27 | 株式会社豊田中央研究所 | 内燃機関の点火装置 |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3868530A (en) * | 1973-07-05 | 1975-02-25 | Champion Spark Plug Co | Spark plug |
| US3926169A (en) * | 1974-06-21 | 1975-12-16 | Fuel Injection Dev Corp | Combined fuel vapor injector and igniter system for internal combustion engines |
| US5361737A (en) * | 1992-09-30 | 1994-11-08 | West Virginia University | Radio frequency coaxial cavity resonator as an ignition source and associated method |
| US5456241A (en) * | 1993-05-25 | 1995-10-10 | Combustion Electromagnetics, Inc. | Optimized high power high energy ignition system |
| US5510668A (en) * | 1994-04-18 | 1996-04-23 | Sandia Corporation | Spark gap with low breakdown voltage jitter |
| DE19723784C1 (de) * | 1997-06-06 | 1998-08-20 | Daimler Benz Ag | Schaltungsanordnung für die Zündung einer Brennkraftmaschine |
| JP2000230426A (ja) * | 1999-02-09 | 2000-08-22 | Honda Motor Co Ltd | マイクロ波点火装置を備えた内燃機関 |
| WO2001098643A2 (en) * | 2000-06-08 | 2001-12-27 | Knite, Inc. | Combustion enhancement system and method |
| DE10239412A1 (de) * | 2002-08-28 | 2004-03-18 | Robert Bosch Gmbh | Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor |
| DE10239411A1 (de) * | 2002-08-28 | 2004-03-18 | Robert Bosch Gmbh | Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor |
-
2003
- 2003-12-20 DE DE2003160192 patent/DE10360192A1/de not_active Withdrawn
-
2004
- 2004-11-15 EP EP04105772A patent/EP1544457A1/de not_active Withdrawn
- 2004-12-14 JP JP2004361775A patent/JP2005180435A/ja active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3868530A (en) * | 1973-07-05 | 1975-02-25 | Champion Spark Plug Co | Spark plug |
| US3926169A (en) * | 1974-06-21 | 1975-12-16 | Fuel Injection Dev Corp | Combined fuel vapor injector and igniter system for internal combustion engines |
| US5361737A (en) * | 1992-09-30 | 1994-11-08 | West Virginia University | Radio frequency coaxial cavity resonator as an ignition source and associated method |
| US5456241A (en) * | 1993-05-25 | 1995-10-10 | Combustion Electromagnetics, Inc. | Optimized high power high energy ignition system |
| US5510668A (en) * | 1994-04-18 | 1996-04-23 | Sandia Corporation | Spark gap with low breakdown voltage jitter |
| DE19723784C1 (de) * | 1997-06-06 | 1998-08-20 | Daimler Benz Ag | Schaltungsanordnung für die Zündung einer Brennkraftmaschine |
| JP2000230426A (ja) * | 1999-02-09 | 2000-08-22 | Honda Motor Co Ltd | マイクロ波点火装置を備えた内燃機関 |
| WO2001098643A2 (en) * | 2000-06-08 | 2001-12-27 | Knite, Inc. | Combustion enhancement system and method |
| DE10239412A1 (de) * | 2002-08-28 | 2004-03-18 | Robert Bosch Gmbh | Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor |
| DE10239411A1 (de) * | 2002-08-28 | 2004-03-18 | Robert Bosch Gmbh | Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 2000, no. 11 3 January 2001 (2001-01-03) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7204220B2 (en) * | 2002-08-28 | 2007-04-17 | Robert Bosch Gmbh | Device for igniting an air-fuel mixture in an internal combustion engine by means of a high frequency electric energy source |
| CN102472240A (zh) * | 2009-08-06 | 2012-05-23 | 创想科学技术工程株式会社 | 混合器、匹配器、点火单元、及等离子体发生器 |
| CN102472240B (zh) * | 2009-08-06 | 2014-10-29 | 创想科学技术工程株式会社 | 混合器、匹配器、点火单元、及等离子体发生器 |
| EP2581998A1 (de) * | 2011-10-14 | 2013-04-17 | Delphi Automotive Systems Luxembourg SA | Zündkerze für Hochfrequenz-Zündsystem |
| EP3150841A4 (de) * | 2014-05-29 | 2017-06-21 | Imagineering, Inc. | Injektor mit eingebautem zündsystem |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10360192A1 (de) | 2005-07-14 |
| JP2005180435A (ja) | 2005-07-07 |
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Legal Events
| Date | Code | Title | Description |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| AK | Designated contracting states |
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| AX | Request for extension of the european patent |
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| 17P | Request for examination filed |
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| AKX | Designation fees paid |
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| 17Q | First examination report despatched |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
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