EP2379859A1 - Bougie d'allumage par laser dans une chambre de précombustion - Google Patents

Bougie d'allumage par laser dans une chambre de précombustion

Info

Publication number
EP2379859A1
EP2379859A1 EP09764786A EP09764786A EP2379859A1 EP 2379859 A1 EP2379859 A1 EP 2379859A1 EP 09764786 A EP09764786 A EP 09764786A EP 09764786 A EP09764786 A EP 09764786A EP 2379859 A1 EP2379859 A1 EP 2379859A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
region
prechamber
receiving
cylinder head
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Withdrawn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
EP09764786A
Other languages
German (de)
English (en)
Inventor
Markus Kraus
Martin Weinrotter
Pascal Woerner
Juergen Raimann
Friedrich Gruber
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.)
Innio Jenbacher GmbH and Co OG
Robert Bosch GmbH
Original Assignee
GE Jenbacher GmbH and Co OHG
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 GE Jenbacher GmbH and Co OHG, Robert Bosch GmbH filed Critical GE Jenbacher GmbH and Co OHG
Publication of EP2379859A1 publication Critical patent/EP2379859A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/12—Engines characterised by precombustion chambers with positive ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • F02B19/1004—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder details of combustion chamber, e.g. mounting arrangements
    • F02B19/1009—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder details of combustion chamber, e.g. mounting arrangements heating, cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • F02B19/1019—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber
    • F02B19/108—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a spark plug for an internal combustion engine, having an antechamber for receiving an ignitable medium, and having a receiving area for means for coupling laser radiation into the prechamber.
  • Such a spark plug is already known from DE 10 2006 018 973 Al.
  • the known system has the disadvantage that when increasing the prechamber volume to increase the ignition energy and a larger focal length for focusing the laser radiation used must be selected, provided that the ignition in the volume increase of the prechamber channels in the preferred range of the overflow channels should remain, which realize a fluid or plasma connection to a combustion chamber of the internal combustion engine to be ignited.
  • a disadvantage of using the larger focal length is in particular the reduction of the optical power density in the ignition point, which i.a. Laser pulses with increased energy required for a reliable ignition.
  • Prechamber contained to increase flammable fluid Compared to the conventional devices in which the prechamber extends substantially in a spatial direction relative to an end face of an ignition device adjoining the prechamber, the volume increase of the prechamber according to the invention is made possible, in particular, by the provision of the rear chamber volume region according to the invention.
  • the back chamber volume region according to the invention represents that volume fraction of the prechamber which does not lie in a first spatial direction, ie in relation to the end face of the ignition device adjoining the prechamber. away from the ignition device, like the pre-chambers of known systems, but in a second, the first spatial direction substantially opposite spatial direction.
  • this configuration according to the invention results in that the entire pre-chamber volume at least partially surrounds the combustion-chamber-side end region of the spark plug.
  • the volume center of gravity of the prechamber volume in contrast to a conventional system, is displaced in the direction of an end of the spark plug facing away from the combustion chamber due to the specially arranged rear chamber volume range.
  • the inventive configuration of the spark plug provides the increase in volume and thus the increase of the ignition energy with the same focal length of a focusing optics used.
  • a particularly efficient combustion of the ignitable medium within the prechamber is given according to an embodiment of the present invention when the rear chamber volume region of the prechamber surrounds the receiving region in an annular and / or toroidal manner.
  • the cross section of the annular receiving area surrounding Schuttingvolumens may also have other forms in addition to a circular or semicircular shape, which are usually selected depending on the desired flow conditions in the pre-chamber, etc.
  • an inlet valve for introducing a fluid, such as e.g. the flammable medium, directly into the antechamber (so-called rinsed pre-chamber)
  • a fluid such as e.g. the flammable medium
  • the exact geometry of the Hintercrovolumens or the Schuttingvolumen limiting wall sections of the prechamber be adapted to the special guidance of the fluid flow, in particular be formed asymmetrically.
  • a diameter of an annularly formed rear chamber volume region can decrease or also expand with increasing angular distance starting from the location of the inlet valve.
  • the rear chamber volume region according to the invention does not extend around the entire circumference of the receiving region of the spark plug, but only over one or more parts of the circumference.
  • the rear chamber volume region according to the invention can also be subdivided into a plurality of segments spaced apart by a respective same angle along a circumferential direction of the receiving region, wherein the segments each form an "extension" of a conventional prechamber geometry in the direction of an end of the spark plug facing away from the combustion chamber.
  • a particularly preferred configuration of the spark plug according to the invention proposes a volume fraction of about 30% to about 70% of the total volume of the prechamber for the rear chamber volume range according to the invention in order to fully exploit the potential of the invention for increasing the ignition energy in the prechamber.
  • even smaller volume fractions of the back chamber volume region according to the invention already offer the advantages according to the invention (increase in the ignition energy while maintaining the focal length).
  • An efficient cooling of the spark plug according to the invention and optionally arranged in the receiving area means for coupling laser radiation in the antechamber is given according to an embodiment of the present invention, then if the rear chamber volume region, in particular radially, preferably radially inwardly, delimiting wall sections of the receiving region have at least one, preferably at least partially circumferential, cooling channel for receiving a cooling fluid.
  • the cooling channels according to the invention can very particularly advantageously cooperate with other existing cooling channels of the spark plug or a cylinder head, which is provided for receiving the spark plug according to the invention.
  • At least one inlet valve can be provided.
  • the inlet valve may preferably be arranged in such a way, in particular in a wall portion of the spark plug which delimits the rear chamber volume region radially outwards, that it allows the introduction of the fluid directly into the rear chamber volume region.
  • the provision of further inlet valves in different sections of the posterior chamber volume area or also of the remaining antechamber is likewise conceivable.
  • the spark plug according to the invention particularly advantageously has a coupling-in optical system for coupling the laser radiation into the prechamber, which is arranged in the receiving region of the spark plug.
  • the coupling optics can be supplied with the laser radiation used for the ignition either by an optical fiber device from a laser light source arranged remotely.
  • a laser device having a laser active solid state laser device for the local generation of the laser radiation in the spark plug, in particular in the receiving area may be arranged.
  • the laser device is advantageously provided coaxially with the spark plug in its receiving area.
  • passively Q-switched laser devices for installation in the spark plug according to the invention are proposed, which may be formed in particular monolithic.
  • the pre-chamber with the special rear chamber volume range “protrudes" the combustion chamber end of the laser device or the coupling optics, in contrast to conventional systems at least by some extent in the prechamber volume, whereby the maintenance of a relatively small focal length is possible without the ignition point Having to remove too far from overflow channels, which establish a fluid connection between the pre-chamber and a combustion chamber of the internal combustion engine on the one hand, the maximum possible ignition energy in the way of increasing the volume of the pre-chamber increases, while on the other hand, the losses resulting from the unburnt mixture from the prechamber into the combustion chamber resulting losses are minimized. Namely, such losses arise in particular when the ignition point is far away from the overflow channels, which is advantageously avoided by the present invention - despite an increased prechamber volume.
  • a wall section bounding the prechamber has at least one overflow channel enabling a fluid connection to a combustion chamber of the internal combustion engine, and that the coupling optical system and / or the laser device is designed so that the laser radiation is at least an ignition point is focused, which is arranged in the region of the overflow.
  • an even more uniform ignition of the ignitable medium located in the antechamber is advantageously provided according to a further variant of the invention if the coupling optics and / or the laser device are designed such that the laser radiation is at least one first ignition point in the rear chamber volume region and preferably at least one second ignition point simultaneously is focused in the region of the overflow.
  • the prechamber of the spark plug according to the invention in particular in an application in the field of stationary engines or large gas engines, etc. integral part of the spark plug or is formed by the spark plug itself, according to a further variant of the invention can also be provided that a pre-chamber, in particular combustion chamber side, limiting Wall section at least partially formed by the cylinder head and / or is an integral part of the cylinder head. That is, in this case, portions of the cylinder head and the spark plug suitably cooperate to form the pre-chamber of the present invention.
  • a wall section bounding the pre-chamber radially outwardly is at least partially formed by the cylinder head itself and / or is an integral part of the cylinder head.
  • the inventive principle can also be realized in the form of a separate prechamber arrangement, in which the prechamber according to the invention has the above-described form as a separate component. That is, an inventive pre-chamber arrangement has a receiving area for a spark plug or means for coupling laser radiation, at least partially from the
  • the spark plug or means for coupling in laser radiation in this case can be used e.g. be screwed into the pre-chamber arrangement and are according to the invention Vorammergeometrie at least partially surrounded by the Hintercrovolumen Scheme.
  • the prechamber arrangement according to the invention can likewise be connected to the cylinder head of an internal combustion engine via a screw connection or else pluggable.
  • Figure 2a shows a partial cross section with a view in the longitudinal direction of the spark plug according to
  • FIG. 1 A first figure.
  • FIG. 2b shows a partial cross-section with a view in the longitudinal direction of a further embodiment of the spark plug according to the invention
  • Figure 2c shows a partial cross-section with a view in the longitudinal direction yet another
  • FIG. 3a shows a partial cross section of a first embodiment of a cylinder head according to the invention with a spark plug according to the invention
  • Figure 3b shows a partial cross-section of another embodiment of a cylinder head according to the invention with a spark plug according to the invention.
  • FIG. 1 schematically shows a first embodiment of a spark plug 100 according to the invention in a partial cross section.
  • the spark plug 100 is preferably used with internal combustion engines (not shown) operating at the lean limit, i. with an air ratio> 1.
  • internal combustion engines not shown
  • stationary large gas engines are operated at the lean limit in order to achieve the highest possible thermodynamic efficiency and at the same time to minimize nitrogen oxide (NOx) emissions.
  • NOx nitrogen oxide
  • a disadvantage of the operation at the lean limit is the low flame speed in the combustion chamber and the associated long burning time.
  • the considered large gas engines i.d.R. operated with highly turbulent combustion process. From a certain bore diameter, for example about 160mm, a high-energy ignition source is required to reliably and quickly start the combustion in a combustion chamber of the large gas engine.
  • the spark plug 100 has an antechamber 110, in which the ignition is introduced for a combustion chamber of an internal combustion engine containing the spark plug 100.
  • the prechamber 110 is charged in a manner known per se with an ignitable medium.
  • the ignitable medium contained in the pre-chamber 110 is ignited by methods described in more detail later.
  • high-energy ignition flares (not shown) through the fluid or plasma connection realizing overflow channels 112 into the combustion chamber 300 of the internal combustion engine.
  • the high-energy ignition torches reliably and quickly ignite the lean mixture present in the combustion chamber 300, which may also be ignited. is also characterized by a value range of the air ratio> 1.9.
  • the spark plug 100 has means for coupling laser radiation 135 into the prechamber 110.
  • the means for coupling laser radiation 135 into the pre-chamber 110 are formed by a laser device 130, which is associated with a coupling optics 131 at its combustion chamber end, which in addition to the spatial separation of the laser device 130 from the antechamber 110 at the same time for focusing of the Laser device 130 generates generated laser radiation 135 to the ignition point ZP, which is arranged as shown in Figure 1 in a combustion chamber side volume third of the antechamber 110.
  • a focusing lens and a combustion chamber window can also be designed separately.
  • the laser device 130 is preferably embodied as a passively Q-switched solid-state laser, to which only pumping light for optical pumping has to be supplied in a suitable manner in order to generate laser pulses with very high peak power, so-called giant pulses.
  • the pump light may be present to the laser device 130, e.g. be supplied from a remote pump light source (not shown) via a light guide device which is optically and possibly also mechanically connected to the spark plug 100 and arranged in their receiving area laser device 130, preferably at its end facing away from the combustion chamber 300.
  • the laser device 130 is preferably constructed monolithically, i. a laser-active solid and its associated passive Q-switching and input and output mirror and any existing optical amplifier, etc. are all integrated into a structural unit or arranged in or on a suitable optical medium.
  • the laser radiation 135 required for an ignition can also be generated directly by a laser light source arranged at a distance and supplied to the coupling optics 131 provided in the spark plug 100.
  • the spark plug 100 has a specially formed antechamber 110 which, with respect to an end face of an ignition device 130 adjacent to the prechamber 110, extends not only substantially in one spatial direction, namely toward the combustion chamber 300.
  • This part of the antechamber which is essentially known from conventional spark plugs, is identified in FIG. 1 by the curly bracket designated by the reference symbol V.
  • the spark plug 100 according to the invention or its prechamber 110 additionally has a special rear chamber volume region 110a, which at least partially surrounds the receiving region 120 of the spark plug 100 in a combustion chamber end region 100a of the spark plug 100.
  • the rear chamber volume region 110a according to the invention forms, in addition to the previously described part V of the prechamber 110, a further part H, which extends in a further spatial direction, namely away from the combustion chamber 300, relative to the end face or, for example, a surface of the coupling optics 131.
  • the rear chamber volume region 110a according to the invention thus leads to an increase in volume of the pre-chamber 110 compared with conventional systems, which, as can be seen from FIG. 1, is formed by the two contiguous regions H, V.
  • the special arrangement of the rear chamber volume region 110a causes a volume center of gravity of the volume of the prechamber 110 to shift toward an end of the spark plug 100 facing away from the combustion chamber 300, and the combustion chamber end of the spark plug 100 or the laser device 130 into the Prechamber 110 protrudes.
  • the required to increase the maximum ignition energy volume of the prechamber 110 is increased while at the same time only a relatively small focal length for the focusing optics of the coupling optics 131 is required to channels ZP in the combustion chamber near volume third of the pre-chamber 110 or directly in the overflow 112, through which the laser-ignited ignitable medium exits into the combustion chamber 300 of the internal combustion engine. Accordingly, by using the prechamber configuration according to the invention, an increase in the volume of the prechamber 110 can take place, and yet existing focusing optics with a predetermined focal length, as known from conventional systems, can be maintained without removing the ignition point ZP from the overflow channels 112.
  • the spark plug 100 allows a very efficient ignition of the ignitable medium in the prechamber 110 and offers by the increased prechamber volume a maximum amount of ignition energy for the ignition of the usually lean mixture in the combustion chamber 300. Due to the usable according to the invention low focal length of the focusing optics results from the associated high power density of the laser radiation 135 in the ZP ZP safe ignition in the antechamber 110, and compared to conventional systems can thus also the Pulse energy of individual laser pulses can be reduced, which increases the service life of the laser device 130.
  • the particular arrangement of the laser device 130 projecting into the prechamber 110 can also promote automatic burnout of the combustion chamber side surface of the coupling optics 131 since the combustion chamber end region 100a of the spark plug 100 according to the invention is exposed on average to higher temperatures than is the case with conventional systems in which a combustion chamber window is arranged flush with the wall bounding the antechamber.
  • the rear chamber volume region 110a of the prechamber 110 surrounds the receiving region 120 in a ring shape, in particular in a torus shape.
  • the cross-section of the rear chamber volume 110a which surrounds the receiving area 120 in a ring-shaped manner may, in addition to a circular or semicircular shape, also have other shapes, the i.d.R. be selected depending on the desired flow conditions in the pre-chamber 110 and so on.
  • FIG. 2a A cross section of the combustion-chamber-side end region 100a of the spark plug 100 from FIG. 1, viewed in the longitudinal direction, is shown in FIG. 2a. It can be seen from FIG. 2a how the rear chamber volume region 110a according to the invention annularly surrounds wall sections 120a of the receiving region 120 of the spark plug 100 and thus significantly increases the pre-chamber volume in comparison to conventional arrangements.
  • the posterior chamber volume area 110a has a
  • the laser device 130 is enclosed by a wall section 120 a of the receiving region 120 (FIG. 1) which bounds the rear chamber volume region 110 a according to the invention radially inwards and is preferably designed in one piece with the remaining body of the spark plug 100.
  • FIG. 2b shows a cross-section of a corresponding embodiment of the spark plug according to the invention, in which two kidney-shaped segments together form the rear chamber volume region 110a according to the invention.
  • Cooling channels (not shown) or the like to provide the receiving area 120 of the spark plug 100 or disposed therein components 130, 131 to be able to cool more efficiently.
  • the wall sections 120a of the receiving region 120 may also have at least one, preferably at least partially circumferential, cooling channel (not shown) for receiving a cooling fluid.
  • the cooling channel is particularly preferably in fluid communication with further cooling channels of the spark plug 100 or of a cylinder head 200 accommodating the spark plug 100, cf. FIG. 3a.
  • FIG. 2c shows a partial cross section of a further embodiment the spark plug 100 according to the invention, in which the inlet valve 140 is arranged, in particular in a wall portion 120b of the spark plug 100 radially outwardly delimiting the rear chamber volume region 110a, allowing the introduction of the fluid directly into the rear chamber volume region 110a.
  • inlet valve 140 for charging the prechamber 110 with ignitable medium.
  • the portions of the posterior chamber volume area 110 a associated with the inlet valve 140 may also contain special means for guiding or
  • the or at least one inlet valve 140 may also be disposed in another area of the prechamber 110, i. outside the posterior chamber volume area 110a, e.g. by doing
  • An antechamber that is not associated with its own inlet valve 140 is also referred to as an "unspurged antechamber.”
  • the unspurged antechamber refers to the ignitable one Medium through the overflow channels 112 directly from the combustion chamber 300.
  • the un-purged prechamber does not allow Vorhuntindividuelle adjustment of the air ratio, ie regardless of the air ratio of the present in the combustion chamber 300 mixture.
  • the maximum ignition energy due to the prechamber ignition is given when there is an almost stoichiometric mixture in the prechamber 110 as the ignitable medium.
  • the coupling optics 131 (FIG. 1) and / or the laser device 130 are designed so that the laser radiation 135 reaches at least a first ignition point in the posterior chamber volume region 110a and, preferably simultaneously, at least a second ignition point ZP is focused in the region of the overflow channel 112, whereby an even faster and more uniform ignition in the pre-chamber 110 is given.
  • pre-chamber 110 of the spark plug 100 in particular for an application in the field of stationary engines or
  • the spark plug 100 itself is formed.
  • the spark plug 100 in this case has e.g. radially outwardly in its combustion chamber end portion 100a via suitable attachment means 150 such as e.g. a thread that allows a detachable connection of the spark plug 100 with a cylinder head of an internal combustion engine.
  • suitable attachment means 150 such as e.g. a thread that allows a detachable connection of the spark plug 100 with a cylinder head of an internal combustion engine.
  • suitable attachment means 150 such as e.g. a thread that allows a detachable connection of the spark plug 100 with a cylinder head of an internal combustion engine.
  • suitable attachment means 150 such as e.g. a thread that allows a detachable connection of the spark plug 100 with a cylinder head of an internal combustion engine.
  • suitable fasteners may be provided on the spark plug 100.
  • the special design of the antechamber is realized by a cooperation of correspondingly shaped sections of the spark plug 101, 102 and of a cylinder head 200 receiving it.
  • FIG. 3 a shows a variant of the invention in which the spark plug 101 itself only defines the rear chamber volume region 110 a according to the invention by wall sections 120 a, 120 b which are correspondingly shaped in its combustion chamber end region 100 a.
  • the further regions of the pre-chamber 110 are predetermined by the geometry of the cylinder head 200, with which the spark plug 101 can be connected via suitable connecting means 151, such as a screw connection.
  • the cylinder head 200 in particular has a wall section 211 which defines the geometry of the prechamber 110 in the region V according to FIG. 1 and which delimits the prechamber 110 on the combustion chamber side.
  • FIG. 3 a shows a variant of the invention in which the spark plug 101 itself only defines the rear chamber volume region 110 a according to the invention by wall sections 120 a, 120 b which are correspondingly shaped in its combustion chamber end region 100 a.
  • the further regions of the pre-chamber 110 are predetermined by the geometry of the cylinder head 200, with which the spark plug 101 can be
  • the wall section 211 is at least partially formed by the cylinder head and / or formed as an integral part of the cylinder head 200.
  • the wall section 211 further has the overflow channels 212, which establish a fluid connection between the prechamber 110 and the combustion chamber 300.
  • portions of the cylinder head 200 and the spark plug 101 suitably cooperate to form the pre-chamber 110 formed in accordance with the present invention.
  • a wall section 220b forming the antechamber 110 in particular the rear chamber volume region 110a, to be formed radially outwardly at least partially by the cylinder head 200 itself and / or is an integral part of the cylinder head 200, cf. FIG. 3b.
  • the spark plug 102 is connected via suitable connecting means 152, such as e.g. a screw connection with the cylinder head 200 connectable.
  • the antechamber 110 is also formed by the cooperation of correspondingly shaped regions of the spark plug and the cylinder head 200.
  • a screw connection for screwing the spark plug 100 into the cylinder head 200 is provided.
  • the prechamber volume may be adjusted as needed.
  • Ignition point ZP be adjusted in the antechamber 110 at the same focal length of the focusing optics.
  • a further variant of the invention comprises a pre-chamber arrangement (not shown) designed as a separate component, which has an antechamber with the geometry according to the invention and a receiving area for a spark plug or for means for coupling laser radiation which is at least partially surrounded by the rear chamber volume area.
  • the overflow channels 112 can be designed both as straight channels or, preferably, also as swirl channels, in order to achieve even better mixing of the prechamber mixture by way of generating a swirl flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

L'invention concerne une bougie d'allumage (100) pour un moteur à combustion interne, comportant une chambre de précombustion (110) destinée à recevoir un agent inflammable, et une zone réceptrice (120) destinée à recevoir des moyens d'injection d'un faisceau laser (135) dans la chambre de précombustion (110). Selon l'invention, une partie de la chambre de précombustion (110) délimitant un espace (110a) situé derrière la chambre entoure au moins partiellement la zone réceptrice (120) dans une partie d'extrémité (100a) côté chambre de combustion de la bougie d'allumage (100).
EP09764786A 2008-12-16 2009-12-01 Bougie d'allumage par laser dans une chambre de précombustion Withdrawn EP2379859A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008062574A DE102008062574A1 (de) 2008-12-16 2008-12-16 Zündkerze
PCT/EP2009/066125 WO2010072519A1 (fr) 2008-12-16 2009-12-01 Bougie d'allumage par laser dans une chambre de précombustion

Publications (1)

Publication Number Publication Date
EP2379859A1 true EP2379859A1 (fr) 2011-10-26

Family

ID=41694080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09764786A Withdrawn EP2379859A1 (fr) 2008-12-16 2009-12-01 Bougie d'allumage par laser dans une chambre de précombustion

Country Status (3)

Country Link
EP (1) EP2379859A1 (fr)
DE (1) DE102008062574A1 (fr)
WO (1) WO2010072519A1 (fr)

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US11421601B2 (en) 2019-03-28 2022-08-23 Woodward, Inc. Second stage combustion for igniter

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US9476347B2 (en) 2010-11-23 2016-10-25 Woodward, Inc. Controlled spark ignited flame kernel flow in fuel-fed prechambers
US9172217B2 (en) 2010-11-23 2015-10-27 Woodward, Inc. Pre-chamber spark plug with tubular electrode and method of manufacturing same
US8584648B2 (en) 2010-11-23 2013-11-19 Woodward, Inc. Controlled spark ignited flame kernel flow
DE102011075559A1 (de) * 2011-05-10 2012-11-15 Robert Bosch Gmbh Laserzündkerze
AT512532B1 (de) 2012-09-26 2013-09-15 Ge Jenbacher Gmbh & Co Og Vorkammersystem für eine Brennkraftmaschine
US9856848B2 (en) 2013-01-08 2018-01-02 Woodward, Inc. Quiescent chamber hot gas igniter
US9765682B2 (en) 2013-06-10 2017-09-19 Woodward, Inc. Multi-chamber igniter
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