EP2504565A1 - Bougie d'allumage laser et procédé permettant de faire fonctionner ladite bougie - Google Patents

Bougie d'allumage laser et procédé permettant de faire fonctionner ladite bougie

Info

Publication number
EP2504565A1
EP2504565A1 EP10770515A EP10770515A EP2504565A1 EP 2504565 A1 EP2504565 A1 EP 2504565A1 EP 10770515 A EP10770515 A EP 10770515A EP 10770515 A EP10770515 A EP 10770515A EP 2504565 A1 EP2504565 A1 EP 2504565A1
Authority
EP
European Patent Office
Prior art keywords
combustion chamber
spark plug
laser spark
region
heat sink
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
Application number
EP10770515A
Other languages
German (de)
English (en)
Other versions
EP2504565B1 (fr
Inventor
Martin Weinrotter
Pascal Woerner
Juergen Raimann
Martin Astner
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 EP2504565A1 publication Critical patent/EP2504565A1/fr
Application granted granted Critical
Publication of EP2504565B1 publication Critical patent/EP2504565B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

Definitions

  • the invention relates to a laser spark plug, in particular for a
  • combustion chamber facing end region arranged combustion chamber window.
  • the invention further relates to an operating method for such
  • Laser radiation is irradiated in a combustion chamber associated with the laser spark plug.
  • the deposits of combustion products affect reliable operation of the laser spark plugs and in particular reduce their service life.
  • this object is achieved in that means are provided for cooling a volume region located in the region of the combustion chamber window and / or a medium located in the volume region. According to the invention, it has been recognized that the precipitation of some combustion products, in particular of carbon and carbon compounds, which arise during operation of the laser spark plug, can be detected on the
  • combustion chamber facing surface of the combustion chamber window a successful - known per se - cleaning of this surface under exposure to
  • the means for cooling have a heat sink which has material with a relatively high thermal conductivity, in particular with a thermal conductivity of about 90 watts per Kelvin and meter at room temperature or more.
  • the heat sink may comprise nickel or a nickel alloy. It is also possible to form the entire heat sink entirely of nickel or a nickel alloy.
  • the heat sink is preferably permanently connected to the housing of the laser spark plug, for example by means of welding.
  • a particularly efficient and uniform cooling of the volume range of interest results according to the invention when the means for cooling, in particular the at least one heat sink, an optical axis of the laser spark plug surrounded, in particular concentrically surrounded.
  • the means for cooling in particular the at least one heat sink, an optical axis of the laser spark plug surrounded, in particular concentrically surrounded.
  • an inner diameter of the heat sink in the region of a front side of the heat sink facing the heat sink is smaller than an inner diameter of the heat sink in the region of a front side of the heat sink facing away from the combustion space.
  • heat conducting means are provided which allow heat to be dissipated from an end region of the laser spark plug facing towards the combustion chamber in the direction of a combustion chamber facing away end region, wherein the heat conducting means are preferably arranged in an interior of the laser spark plug and / or in at least one wall section a housing of the laser spark plug are integrated.
  • the cooling means according to the invention are particularly advantageously in good thermal contact with the heat conducting means, so that an efficient dissipation of heat from the region of the combustion chamber facing surface of the combustion chamber window into the region of the combustion chamber facing away from the combustion chamber
  • the heat conducting for example, in a further
  • the cooling means according to the invention may, in addition to one or more heat sinks u.a. also have a fluid-based cooling system in which
  • Combustion chamber window is removed using a fluid.
  • heat pipes heat pipes
  • heat pipes can advantageously also be integrated directly into a housing of the laser spark plug.
  • the method according to the invention provides that a volume region located in the region of the combustion chamber window and / or a medium located in the volume region is cooled, preferably to a temperature of approximately below 350 ° C. to approximately below 300 ° C.
  • Hydrocarbons for example in the form of soot
  • Hydrocarbons in this area, so that an optimal support for cleaning the combustion chamber window by means of laser radiation is possible.
  • Investigations by the applicant according to the invention favored carbon deposits on the surface of the combustion chamber window cause a simpler removal of other, inorganic combustion residues that occur during operation of the laser spark plug on the
  • the beam density of the laser radiation may be up to an order of magnitude lower compared to conventional Abinstitutsvorticiann in which no inventively introduced carbon compounds or carbon black on the combustion chamber facing surface of the combustion chamber window are present.
  • FIG. 1 shows schematically a partial cross section of a
  • FIG. 1a, 2b different embodiments of heat sinks for the
  • FIG. 3 shows a simplified flowchart of an embodiment of the method according to the invention.
  • FIG. 1 shows a first embodiment of the invention
  • Laser spark plug 100 in a partial cross section is used for example in internal combustion engines of motor vehicles or in stationary large gas engines to laser radiation 20 to a in A firing point ZP arranged in a combustion chamber 200 of the internal combustion engine can be focused in order to ignite an air / fuel mixture located in the combustion chamber 200.
  • the laser radiation 20 can be generated locally in the laser spark plug 100 in a manner known per se, for example by using a laser device 110, which i.a. a laser-active solid (not shown) and a passive Q-switching.
  • a laser device 110 which i.a. a laser-active solid (not shown) and a passive Q-switching.
  • the laser spark plug 100 can be bundled by the laser spark plug 100 from a laser source arranged remotely located laser source and irradiated to the ignition point ZP.
  • various combustion products in particular inorganic components, which originate, inter alia, from additives of the engine oil of the internal combustion engine, are deposited on the surface 120a of the combustion chamber window 120 of the laser spark plug 100 facing the combustion chamber 200.
  • Combustion chamber window 120 favors the cleaning. Investigations by the Applicant are by up to an order of magnitude smaller
  • Combustion chamber window 120 favors. In this way, therefore, the carbon compounds required for efficient cleaning can be particularly expedient from those produced during laser ignition
  • the laser spark plug 100 therefore has means 130 for cooling the volume region 210 located in the combustion chamber-facing end region 100a and / or a medium located in the volume region 210, for example the combustion exhaust gases.
  • the cooling means 130 have at least one heat sink 131, which, as shown in FIG. 1, is approximately annular in shape and is preferably non-detachably connected to the housing 101 of the laser spark plug 100 in its end region 100a facing the combustion chamber.
  • the heat sink 131 preferably comprises material having a relatively high thermal conductivity, in particular a thermal conductivity of about 90 watts per Kelvin and meter at room temperature or more; For example, nickel or a nickel alloy can be used for this purpose.
  • the heat sink 131 surrounds an optical axis OA of the laser spark plug 100, in particular concentrically surrounds.
  • the heat sink 131 simultaneously serves to shield the surface 120a of the combustion chamber window 120 from combustion particles which originate in the region of the ignition point ZP, which could damage the combustion chamber window 120 when it strikes the surface 120a.
  • the heat sink 131 is substantially is formed annularly, and an inner diameter D1 of the heat sink 131 in the region of its combustion chamber facing end face 131 a is a maximum of about 105 percent to about 200 percent of a beam diameter DS ( Figure 2a) of the radiated by the laser spark plug 100 laser radiation 20th
  • Heat energy can in the housing 101 of the laser spark plug 100th
  • Heat conduction means 140 may be provided, which allow a dissipation of heat from the combustion chamber facing end portion 100a of the laser spark plug 100 in the direction of a combustion chamber facing away end portion 100b.
  • the heat-conducting means 140 preferably comprise nickel and / or copper and / or silver deposits 142 or inserts made of corresponding alloys, which are either arranged directly in the interior of the laser spark plug 100 or else integrated directly into at least one wall section of the housing 101 of the laser spark plug 100 could be.
  • the heat conducting means 140 may also comprise a fluid-based system, in particular also one or more heat pipes or the like.
  • the heat sink 131 is preferably insoluble, in particular materially bonded, so connected to the housing 101 of the laser spark plug 100 that it is in good thermal contact with the heat conducting means 140 or inserts 142.
  • the heat conducting means 140 have a contact region 141 which, when the laser spark plug 100 is installed in a cylinder head (not shown) of an internal combustion engine, makes good thermal contact with the engine
  • Figure 2a shows a plan view of the combustion chamber facing end face 131 a (Figure 1) of the heat sink 131st From Figure 2a it can be seen that the
  • Inner diameter D1 of the heat sink 131 in the region of the end face 131 a ( Figure 1) is only slightly larger than the beam diameter DS of
  • Inner diameter D1 is according to one embodiment a maximum of about 105 percent to about 200 percent of the beam diameter DS.
  • the inner diameter D1 of the heat sink 131 in the region of the combustion chamber facing end face 131 a ( Figure 1) is smaller than an inner diameter D2 of the heat sink 131 in the region of
  • FIG. 2b shows a top view of a further variant of a
  • Heat sink 131 in which a total of four radially extending slits 131 'are provided, which allow improved fluid communication between the combustion chamber 200 ( Figure 1) and surrounded by the heat sink 131 volume region 210, so that an efficient flushing of the volume range 210 with fresh gas is possible.
  • This advantageously prevents the formation of a residual gas cushion in the region of the surface 120a of the combustion chamber window 120, which contributes to the fact that the surface 120a of the combustion chamber window 120 does not become sooty due to premature quenching of the flame.
  • one or more bores may also be provided in the heat sink 131 in order to allow an improved fluid exchange between the combustion chamber 200 and the volume region 210.
  • FIG. 3 shows a flow chart of an embodiment of the method according to the invention.
  • a first step 300 the volume region 210 or a medium therein is cooled, preferably to a temperature of from below about 350 ° C. to below about 300 ° C. This advantageously results in precipitation of carbon or carbon compounds in the region of the surface 120a of the combustion chamber window 120th These carbon deposits allow a simpler cleaning of the combustion chamber window 120, which is accomplished in the further step 310 by applying laser pulses 20 of high power or energy density to the surface 120a of the combustion chamber window 120.
  • the required laser beam density for cleaning is generally dependent on the covering material.
  • inorganic coatings which are derived inter alia from the additives of motor oil and the like, are only with very high beam densities, which in conventional cleaning methods close to the
  • Destruction thresholds of the material of the combustion chamber window 120 are to be cleaned.
  • the introduction of carbon into the parasitic deposits of the combustion chamber window 120 which is made possible according to the invention, advantageously makes it possible to reduce the radiance required for cleaning.
  • CaS0 4 -containing deposits are conditioned by the addition of carbon compounds according to the invention such that advantageously only one up to about one
  • the construction of the combustion chamber-facing end region 100a of the laser spark plug 100 can be optimized so that efficient cooling of the volume region 210 is possible in order to produce semi-unburned hydrocarbon compounds in the region of the combustion chamber window 120.
  • Carbon components in the deposit of inorganic combustion residues that are imaged on the surface 120 advantageously enable efficient cleaning by means of laser radiation 20 without a simultaneous destruction of the combustion chamber window 120.
  • the means 130 for cooling according to the invention allow an efficient reduction of the temperature in the volume region 210 in front of the combustion chamber window 120, so that a controlled extinction of flames before the combustion chamber
  • Combustor window 120 is achieved at the laser ignition. It is beyond that important to transport a sufficient amount of fresh mixture to the combustion chamber window 120 so that it does not become a residual gas cushion before the combustion chamber
  • Combustion chamber window 120 comes, which prevents the window 120 from becoming soiled by premature quenching of the flame.
  • the formation of the residual gas cushion can be counteracted by the slit 131 '(FIG. 2b) provided in accordance with the invention in the heat sink 131 and / or by further bores in the heat sink 131.
  • the laser spark plug 100 according to the invention is preferred.

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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne une bougie d'allumage laser (100), en particulier pour un moteur à combustion interne d'un véhicule automobile, ladite bougie comprenant une fenêtre de chambre de combustion (120) agencée dans une zone d'extrémité (100a) en regard de la chambre de combustion. Selon l'invention, des moyens (130) sont conçus de manière à refroidir une zone de volume (210) se trouvant dans la zone de la fenêtre de chambre à combustion (120) et/ou un milieu se trouvant dans la zone de volume (210). Les moyens de refroidissement (130) comportent un corps de refroidissement qui présente un matériau dont la conductivité thermique est comparativement élevée, en particulier d'environ 90 watts par mètre-kelvin à la température ambiante ou à une température supérieure. Le corps de refroidissement (131) présente sensiblement la forme d'un anneau circulaire. Un diamètre intérieur (Dl) du corps de refroidissement (131) dans la zone d'une face frontale (131a) du corps de refroidissement (31) en regard de la chambre de combustion est inférieur à un diamètre intérieur (D2) du corps de refroidissement (131) dans la zone d'une face frontale du corps de refroidissement (131) opposé à la chambre de combustion. Des moyens thermoconducteurs (140) permettent une déviation de chaleur depuis une zone d'extrémité (100a) de la bougie d'allumage laser (100) en regard de la chambre de combustion en direction d'une zone d'extrémité (100b) opposée à la chambre de combustion.
EP10770515.4A 2009-11-23 2010-09-23 Bougie d'allumage laser et procédé permettant de faire fonctionner ladite bougie Not-in-force EP2504565B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009047010A DE102009047010A1 (de) 2009-11-23 2009-11-23 Laserzündkerze und Betriebsverfahren hierfür
PCT/EP2010/064053 WO2011060983A1 (fr) 2009-11-23 2010-09-23 Bougie d'allumage laser et procédé permettant de faire fonctionner ladite bougie

Publications (2)

Publication Number Publication Date
EP2504565A1 true EP2504565A1 (fr) 2012-10-03
EP2504565B1 EP2504565B1 (fr) 2017-11-15

Family

ID=43414915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10770515.4A Not-in-force EP2504565B1 (fr) 2009-11-23 2010-09-23 Bougie d'allumage laser et procédé permettant de faire fonctionner ladite bougie

Country Status (6)

Country Link
US (1) US8789497B2 (fr)
EP (1) EP2504565B1 (fr)
JP (1) JP5436693B2 (fr)
CN (1) CN102612595B (fr)
DE (1) DE102009047010A1 (fr)
WO (1) WO2011060983A1 (fr)

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
AT511930A1 (de) * 2011-09-06 2013-03-15 Ge Jenbacher Gmbh & Co Og Laserzündkerze
AT512038B1 (de) * 2011-12-23 2013-05-15 Ge Jenbacher Gmbh & Co Ohg Wärmeleitvorrichtung zur ableitung von wärme eines zündkerzengehäuses einer zündkerze
DE102012204582A1 (de) * 2012-03-22 2013-09-26 Robert Bosch Gmbh Laserzündkerze
US20140136085A1 (en) * 2012-11-15 2014-05-15 Ford Global Technologies, Llc Laser ignition and misfire monitor
US20160040644A1 (en) * 2012-11-15 2016-02-11 Ford Global Technologies, Llc Engine with laser ignition
JP6478509B2 (ja) 2014-07-31 2019-03-06 株式会社Ｓｏｋｅｎ レーザ点火装置
JP6491896B2 (ja) 2015-02-03 2019-03-27 株式会社Ｓｏｋｅｎ レーザ点火プラグ及びその製造方法
US9932956B2 (en) 2016-02-24 2018-04-03 Denso International America, Inc. Laser ignition device
EP3366914A3 (fr) 2017-02-06 2019-01-02 Ricoh Company Ltd. Dispositif laser et moteur à combustion interne

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JPS5588074U (fr) * 1978-12-14 1980-06-18
JPS59826B2 (ja) 1978-12-26 1984-01-09 株式会社リコー 静電印刷用導電性トナ−
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WO1987005364A1 (fr) * 1986-03-07 1987-09-11 Bennett Automotive Technology Pty. Ltd. Systeme d'allumage par laser
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AU6949298A (en) * 1997-04-21 1998-11-13 James W. Early Laser ignition
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US7114858B2 (en) * 2003-09-23 2006-10-03 The University Of Chicago Laser based ignition system for natural gas reciprocating engines, laser based ignition system having capability to detect successful ignition event; and distributor system for use with high-powered pulsed lasers
EP1519039A1 (fr) * 2003-09-23 2005-03-30 AVL List GmbH Laser solide déclenché à pompage optique
JP4354302B2 (ja) * 2004-02-27 2009-10-28 三菱重工業株式会社 着火時期変更時のレーザ焦点調整装置を備えたレーザ着火式エンジン
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Also Published As

Publication number Publication date
CN102612595B (zh) 2015-11-25
EP2504565B1 (fr) 2017-11-15
JP2013511658A (ja) 2013-04-04
US20130025549A1 (en) 2013-01-31
DE102009047010A1 (de) 2011-05-26
CN102612595A (zh) 2012-07-25
US8789497B2 (en) 2014-07-29
JP5436693B2 (ja) 2014-03-05
WO2011060983A1 (fr) 2011-05-26

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