EP2020717A2 - Dispositif d'allumage multi-points - Google Patents

Dispositif d'allumage multi-points Download PDF

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Publication number
EP2020717A2
EP2020717A2 EP07021930A EP07021930A EP2020717A2 EP 2020717 A2 EP2020717 A2 EP 2020717A2 EP 07021930 A EP07021930 A EP 07021930A EP 07021930 A EP07021930 A EP 07021930A EP 2020717 A2 EP2020717 A2 EP 2020717A2
Authority
EP
European Patent Office
Prior art keywords
intermediate member
opening
ignition device
multipoint ignition
electrode pair
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
EP07021930A
Other languages
German (de)
English (en)
Other versions
EP2020717A3 (fr
EP2020717B1 (fr
Inventor
Katsuaki Minami
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.)
Miyama Inc
Original Assignee
Miyama Inc
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 Miyama Inc filed Critical Miyama Inc
Publication of EP2020717A2 publication Critical patent/EP2020717A2/fr
Publication of EP2020717A3 publication Critical patent/EP2020717A3/fr
Application granted granted Critical
Publication of EP2020717B1 publication Critical patent/EP2020717B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01T13/46—Sparking plugs having two or more spark gaps
    • H01T13/462—Sparking plugs having two or more spark gaps in series connection
    • 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
    • H01T13/02—Details
    • H01T13/16—Means for dissipating heat

Definitions

  • This invention relates to a multipoint ignition device used in a multipoint ignition engine having a plurality of ignition gaps in a single combustion chamber.
  • JP2-123281A and JP1-193080A disclose a multipoint ignition engine in which a plurality of electrode pairs constituting ignition gaps are disposed around a cylinder opening portion of an engine such that an air-fuel mixture in a combustion chamber is ignited from the plurality of ignition gaps. According to this constitution, in comparison with a case in which ignition is performed using a conventional spark plug that performs ignition only from the center of the combustion chamber, combustion of the air-fuel mixture in a peripheral edge portion of the combustion chamber is promoted, enabling improvements in engine output and fuel economy.
  • the heat value (heat radiation property) of the electrode pair in this multipoint ignition device must be set at an appropriate value to ensure that the temperature of the electrode pair is held within an appropriate range of 450°C to 1000°C, or more preferably 500°C to 850°C to leave a margin for error.
  • This invention has been designed in consideration of the problems in the prior art, and it is an object thereof to set the heat value of all electrode pairs in a multipoint ignition device appropriately to prevent pollution of the electrode pairs and the occurrence of pre-ignition.
  • a multipoint ignition device comprises: an interposed member interposed between a cylinder head and a cylinder block of an engine, having an opening in a position corresponding to a cylinder opening portion; and a plurality of intermediate members connected respectively to a plurality of electrode pairs and held by the interposed member. Respective heat values of the plurality of electrode pairs are set individually by varying a contact area between the plurality of intermediate members and the interposed member according to the respective disposal positions of the plurality of intermediate members.
  • the heat values of all of the electrode pairs in a multipoint ignition device can be set appropriately, and as a result, pollution of the electrode pairs and the occurrence of pre-ignition can be prevented.
  • FIG. 1 is a constitutional diagram of a multipoint ignition device according to this invention.
  • FIG. 2 is a partially enlarged view of the multipoint ignition device according to this invention.
  • FIGs. 3 to 8 are views illustrating a heat value adjustment method.
  • the heat radiation property of an electrode pair is expressed as a "heat value”, similarly to a conventional spark plug. Accordingly, a good heat radiation property is referred to as a "high heat value”, and a poor heat radiation property is referred to as a "low heat value”.
  • FIG. 1 shows the constitution of a multipoint ignition device according to this invention
  • FIG. 2 is a partially enlarged view thereof.
  • a multipoint ignition device is formed integrally with a head gasket 1 of an engine, and when the multipoint ignition device is sandwiched between a cylinder head and a cylinder block of the engine, a plurality of electrode pairs 2 are disposed around a cylinder opening portion.
  • Each electrode pair 2 is constituted by a current-carrying electrode 2a and an earth electrode 2b, and an ignition gap is formed between the electrodes 2a, 2b.
  • the head gasket 1 is formed with a plurality of openings 3, 4.
  • the largest, central opening 3 has a substantially identical diameter to the cylinder opening portion, and is formed in a position corresponding to the cylinder opening portion so as to form a part of a side wall of a combustion chamber when attached to the engine.
  • the openings 4 disposed on the periphery of the opening 3 are water holes connected to cooling water passages formed in the cylinder head and cylinder block.
  • An intermediate member 6 is connected to each of the plurality of electrode pairs 2, and by holding the intermediate member 6 in the head gasket 1, the plurality of electrode pairs 2 are held on the head gasket 1.
  • the electrode pairs 2 and intermediate members 6 are formed integrally from an identical material having a high heat resistance property, such as nickel, and although the boundary between the two members is not evident, for ease of description the thick part in the diametrical direction of the opening 3 will be referred to as the intermediate member 6, and the part that extends in a gently curving S shape from the intermediate member 6 to the two sides and projects partially into the opening 3 will be referred to as the electrode pair 2.
  • the plurality of electrode pairs 2 are electrically connected in series via the intermediate members 6. Hence, when a high secondary voltage is applied to a terminal 7, discharge occurs first in the ignition gap of the electrode pair 2 having the current-carrying electrode 2a that is connected to the terminal 7, after which discharge occurs in the adjacent electrode pair 2 thereto. Discharge then occurs around the opening 3 in sequence from the terminal 7 side until finally, discharge occurs in the ignition gap of the electrode pair 2 that is closest to an earth terminal 8.
  • each intermediate member 6 has an end portion 6s on the opening 3 side that extends to a peripheral edge of the opening 3 such that an end surface thereof is exposed to an inner peripheral surface of the opening 3.
  • the heat value of each electrode pair 2 is set individually by varying the contact area between the intermediate member 6 and the head gasket 1 and the surface area of the part of the intermediate member 6 that is exposed to the opening 3 (to be referred to hereafter as the "exposure area") according to the position in which the intermediate member 6 is disposed. For example, setting is performed such that the electrode pair 2 disposed in a position of the combustion chamber having a high wall surface temperature has a high heat value, whereas the electrode pair 2 disposed in a position having a low wall surface temperature has a low heat value.
  • the contact area between the intermediate member 6 that is connected to the electrode pair 2 and the head gasket 1 is modified by modifying at least one of a length L of the intermediate member 6, a width W of the intermediate member 6, and a height H (see FIG. 3 ) of the part that is not exposed to the opening 3.
  • At least one of the length L, width W and height H of the part of the intermediate member 6 connected to the electrode pair 2 that is buried in the head gasket 1 should be increased above that of the other electrode pairs 2, thereby increasing the contact area between the intermediate member 6 and the head gasket 1.
  • the heat of the electrode pair 2 escapes to the cylinder head and cylinder block of the engine through the intermediate member 6 and the head gasket 1 more easily, and thus the heat value of the electrode pair 2 can be raised.
  • the end portion 6s of the intermediate member 6 connected to the electrode pair 2 may be buried in the head gasket 1 completely.
  • the amount of heat received by the intermediate member 6 from combustion gas decreases, leading to a decrease in the temperature of the intermediate member 6 and an increase in the ease with which the heat of the electrode pair 2 escapes through the intermediate member 6.
  • the heat value of the electrode pair 2 can be raised further.
  • FIG. 5 shows an example in which the intermediate member 6 has been completely buried in the head gasket 1 and the width W of the intermediate member 6 has been increased to raise the heat value of the electrode pair 2 connected to the intermediate member 6.
  • the heat value of the electrode pair 2 may be raised even higher by implementing surface processing on the surface of the intermediate member 6 connected to the electrode pair 2 to improve the heat radiation property of the intermediate member 6 and thereby improve thermal conductivity from the intermediate member 6 to the head gasket 1.
  • surface processing implemented on the surface of the intermediate member 6 processing to plate the intermediate member 6 with a material (copper or platinum, for example) exhibiting higher thermal conductivity than the material of the intermediate member 6, processing to increase the contact area between the intermediate member 6 and the head gasket 1 by forming minute irregularities on the surface of the intermediate member 6, and so on may be employed.
  • the length L and height H of the end surface of the end portion 6s of the intermediate member 6 connected to the electrode pair 2, which is exposed to the opening 3, may be increased.
  • the end surface of the end portion 6s may be bent toward the inside of the head gasket 1 from the state shown in FIG. 3 , thereby increasing the exposure area of the intermediate member 6 to the opening 3.
  • the exposure area of the intermediate member 6 to the opening 3 is increased, the amount of heat transferred from the combustion gas to the electrode pair 2 via the intermediate member 6 increases, and thus the heat value of the electrode pair 2 can be lowered further.
  • the exposure area of the intermediate member 6 to the opening 3 is increased by bending the end surface of the end portion 6s.
  • the exposure area may also be increased by forming irregularities on the end surface, and therefore grooves, indentations, projections, and so on may be formed on the end surface of the end portion 6s instead of bending the end surface of the end portion 6s.
  • the upper surface or lower surface of the exposed end portion 6s may be bent instead of the end surface of the end portion 6s.
  • the exposure area of the intermediate member 6 to the opening 3 may be modified by modifying the length L or height H of the end portion 6s projecting into the opening 3, or by modifying a projection amount X into the opening 3.
  • the contact area between the intermediate member 6 and head gasket 1 is modified principally by modifying the dimensions of the intermediate member 6, but the method of modifying the contact area is not limited thereto.
  • the contact area between the intermediate member 6 and the head gasket 1 may be increased by forming irregularities on the surface of the intermediate member 6 or the inner surface of the head gasket 1 which contacts the intermediate member 6.
  • the contact area may be reduced by using these irregularities to form voids between the intermediate member 6 and head gasket 1 or dispose a thermal insulation material in the gaps.
  • the heat values of the electrode pairs 2 can be set individually, and by setting the heat values of all of the electrode pairs 2 appropriately, pollution of the electrode pairs 2 and the occurrence of pre-ignition can be prevented.
EP20070021930 2007-08-01 2007-11-12 Méthode pour définir individuellement les valeurs de chaleur respectives d'une pluralité d'électrodes Active EP2020717B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007200420A JP4079989B1 (ja) 2007-08-01 2007-08-01 多点点火装置

Publications (3)

Publication Number Publication Date
EP2020717A2 true EP2020717A2 (fr) 2009-02-04
EP2020717A3 EP2020717A3 (fr) 2011-12-21
EP2020717B1 EP2020717B1 (fr) 2013-01-16

Family

ID=39381833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070021930 Active EP2020717B1 (fr) 2007-08-01 2007-11-12 Méthode pour définir individuellement les valeurs de chaleur respectives d'une pluralité d'électrodes

Country Status (3)

Country Link
EP (1) EP2020717B1 (fr)
JP (1) JP4079989B1 (fr)
CN (1) CN101359812B (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4535735A (en) * 1981-05-09 1985-08-20 Nippon Soken, Inc. Multi-gap spark ignition system
JPH02238176A (ja) * 1989-03-09 1990-09-20 Mazda Motor Corp エンジンの点火装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2325543Y (zh) * 1997-04-18 1999-06-23 冯顺满 多点式点火装置
US6161520A (en) * 1999-03-22 2000-12-19 The Gasket King Multiple spark ignition gasket
CN2481867Y (zh) * 2001-06-13 2002-03-13 栾金波 汽车发动机点火系

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4535735A (en) * 1981-05-09 1985-08-20 Nippon Soken, Inc. Multi-gap spark ignition system
JPH02238176A (ja) * 1989-03-09 1990-09-20 Mazda Motor Corp エンジンの点火装置

Also Published As

Publication number Publication date
EP2020717A3 (fr) 2011-12-21
JP2009036066A (ja) 2009-02-19
CN101359812A (zh) 2009-02-04
EP2020717B1 (fr) 2013-01-16
JP4079989B1 (ja) 2008-04-23
CN101359812B (zh) 2012-05-30

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