EP1544457A1 - Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor - Google Patents

Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor Download PDF

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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Withdrawn
Application number
EP04105772A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ewald Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1544457A1 publication Critical patent/EP1544457A1/de
Withdrawn legal-status Critical Current

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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)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)
EP04105772A 2003-12-20 2004-11-15 Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor Withdrawn EP1544457A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10360192 2003-12-20
DE2003160192 DE10360192A1 (de) 2003-12-20 2003-12-20 Vorrrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor

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 (ja)
JP (1) JP2005180435A (ja)
DE (1) DE10360192A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
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 (en) * 2011-10-14 2013-04-17 Delphi Automotive Systems Luxembourg SA Spark plug for high frequency ignition system
EP3150841A4 (en) * 2014-05-29 2017-06-21 Imagineering, Inc. Injector having in-built ignition system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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
DE10239411A1 (de) * 2002-08-28 2004-03-18 Robert Bosch Gmbh Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor
DE10239412A1 (de) * 2002-08-28 2004-03-18 Robert Bosch Gmbh Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor

Patent Citations (10)

* Cited by examiner, † Cited by third party
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
DE10239411A1 (de) * 2002-08-28 2004-03-18 Robert Bosch Gmbh Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor
DE10239412A1 (de) * 2002-08-28 2004-03-18 Robert Bosch Gmbh Vorrichtung zum Zünden eines Luft-Kraftstoff-Gemischs in einem Verbrennungsmotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 11 3 January 2001 (2001-01-03) *

Cited By (5)

* Cited by examiner, † Cited by third party
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 (en) * 2011-10-14 2013-04-17 Delphi Automotive Systems Luxembourg SA Spark plug for high frequency ignition system
EP3150841A4 (en) * 2014-05-29 2017-06-21 Imagineering, Inc. Injector having in-built ignition system

Also Published As

Publication number Publication date
DE10360192A1 (de) 2005-07-14
JP2005180435A (ja) 2005-07-07

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