EP2020716B1 - Multipoint ignition device - Google Patents
Multipoint ignition device Download PDFInfo
- Publication number
- EP2020716B1 EP2020716B1 EP20070021929 EP07021929A EP2020716B1 EP 2020716 B1 EP2020716 B1 EP 2020716B1 EP 20070021929 EP20070021929 EP 20070021929 EP 07021929 A EP07021929 A EP 07021929A EP 2020716 B1 EP2020716 B1 EP 2020716B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ignition device
- opening
- intermediate member
- multipoint ignition
- multipoint
- 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.)
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Links
- 239000000463 material Substances 0.000 claims description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 4
- 230000001747 exhibiting effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H01T13/46—Sparking plugs having two or more spark gaps
- H01T13/462—Sparking plugs having two or more spark gaps in series connection
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.
- a multipoint ignition device according to the preamble portion of claim 1 is known from JP2-238176A .
- 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.
- This invention has been designed in consideration of these problems in the prior art, and it is an object thereof to provide a heat value adjustment method for a multipoint ignition device.
- 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. A part of at least one of the plurality of intermediate members is exposed to the opening.
- a part of the intermediate member connected to the electrode pair is exposed to the opening, which constitutes a part of a combustion chamber.
- 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.
- 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 formed from a conductive material is connected to each of the plurality of electrode pairs 2, and by holding the intermediate members 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 extends to a peripheral edge of the opening 3, and a tip end surface thereof is exposed to an inner peripheral surface of the opening 3.
- the heat value can be adjusted by modifying the surface area of this part (to be referred to hereafter as the "exposure area").
- the exposure area of the intermediate member 6 should be increased.
- the amount of heat received by the intermediate member 6 from the combustion gas increases, making the temperature of the electrode pair 2 less likely to fall, and thus the heat value of the multipoint ignition device can be reduced.
- a projection amount X by which the intermediate member 6 is caused to project into the opening 3 may be increased, as shown in FIG. 3 , or a width W of the exposed part of the intermediate member 6 may be increased, as shown in FIG. 4 .
- a height H of the exposed part of the intermediate member 6 may also be increased provided that electric leakage from the intermediate member 6 into the cylinder head and cylinder block does not occur.
- the heat value may be reduced further by bending a tip end surface 6s of the projecting part to increase the surface area thereof, as shown in FIG. 5 .
- Any surface may be bent as long as it belongs to the projecting part.
- the surface area of the projecting part may also be increased by forming grooves, indentations, projections and the like on the surface instead of bending the surface.
- the exposure area of the intermediate member 6 should be reduced, in contrast to a case in which the heat value is reduced.
- the intermediate member 6 may be completely buried in the interior of the head gasket 1, as shown in FIG. 6 , to make the exposure area of the intermediate member 6 zero.
- the intermediate member 6 extends to the peripheral edge of the opening 3 so as to be exposed to the opening 3, but a side hole extending in the diametrical direction of the opening 3 or a groove extending in the circumferential direction of the opening 3 may be formed in the inner peripheral surface of the opening 3 such that a part of the intermediate member 6 is exposed to the opening 3 via the side hole or groove.
- all of the intermediate members 6 have the same exposure area, but when the heat value required for each electrode pair 2 is different, the exposure area of the intermediate member 6 may be modified according to its position.
- the electrode pair 2 on an exhaust port side has a higher temperature than the electrode pair 2 on an intake port side, and therefore, by reducing the exposure area of the intermediate member 6 disposed on the exhaust port side, the heat value can be raised.
- FIGs. 7 and 8 may be employed where appropriate in addition to the constitutions described above.
- FIG. 7 shows a constitution in which the intermediate member 6 is formed from a plurality of materials having different thermal conductivity values, thereby enabling wider-range heat value adjustment.
- the part of the intermediate member 6 that is connected to the electrode pair 2 and the vicinity of the part that is exposed to the opening 3 are formed from the same material as the electrode pair 2, i.e. a material exhibiting excellent heat resistance such as nickel, whereas a part 6b on the opposite side of the opening 3 is formed from a material having high thermal conductivity such as copper.
- the entire intermediate member 6 may be formed from a material having high thermal conductivity, such as copper.
- the intermediate member 6 may be formed from a plurality of materials having different thermal conductivity values by forming the outer side of the intermediate member 6 from a material exhibiting excellent heat resistance, such as nickel, and burying a material having high thermal conductivity, such as copper, in the interior thereof (a shell structure).
- a material having high thermal conductivity, such as copper may be sandwiched from both sides by a material exhibiting excellent heat resistance, such as nickel (a sandwich structure).
- the material having high thermal conductivity, such as copper may be applied in the form of a metal powder so that distortion caused by differences in the thermal expansion coefficient of the different materials can be absorbed.
- FIG. 8 shows a constitution in which a holding portion 1s of the head gasket 1, which holds the intermediate member 6, is formed from an insulating material such as a ceramic, and a part 1e of the head gasket 1 other than the holding portion 1s is formed from a different insulating material to the material of the holding portion 1s.
- the part 1e other than the holding portion 1s by forming the part 1e other than the holding portion 1s from a material having high thermal conductivity, such as aluminum, the amount of heat radiated from the intermediate member 6 to the cylinder head and cylinder block through the head gasket 1 can be increased, enabling an increase in the heat value of the multipoint ignition device. Moreover, the amount of heat that is transferred from the cylinder head to the cylinder block through the head gasket 1 increases, and therefore knocking, which occurs when the temperature of the cylinder head becomes excessive, can be suppressed.
- a material having high thermal conductivity such as aluminum
- the part 1e other than the holding portion 1s may be formed from a material having low thermal conductivity, such as zirconia, to reduce the amount of heat that is radiated from the intermediate member 6 to the cylinder head and cylinder block through the head gasket 1.
Description
- 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.
- A multipoint ignition device according to the preamble portion of
claim 1 is known fromJP2-238176A -
JP2-123281A JP1-193080A - When the temperature of the electrode pair is lower than a self-cleaning temperature, carbon sticks to the vicinity of the electrode pair such that a spark can no longer fly from the electrode pair.
- Conversely, when the temperature of the electrode pair rises excessively, the electrode pair itself becomes a heat source, and therefore pre-ignition occurs, causing ignition before the spark flies. Hence, a method of adjusting the heat value of an ignition device to an appropriate value is also required in a multipoint ignition device such as that described above.
- This invention has been designed in consideration of these problems in the prior art, and it is an object thereof to provide a heat value adjustment method for a multipoint ignition device.
- A multipoint ignition device according to this invention 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. A part of at least one of the plurality of intermediate members is exposed to the opening.
- According to this invention, a part of the intermediate member connected to the electrode pair is exposed to the opening, which constitutes a part of a combustion chamber. Hence, by adjusting the exposure area of the intermediate member, the amount of heat received by the multipoint ignition device from the combustion gas can be adjusted, whereby the heat value of the multipoint ignition device can be adjusted.
-
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. - An embodiment of this invention will be described below with reference to the attached drawings.
-
FIG. 1 shows the constitution of a multipoint ignition device according to this invention, andFIG. 2 is a partially enlarged view thereof. In this embodiment, a multipoint ignition device is formed integrally with ahead 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 ofelectrode pairs 2 are disposed around a cylinder opening portion. Eachelectrode pair 2 is constituted by a current-carryingelectrode 2a and anearth electrode 2b, and an ignition gap is formed between theelectrodes - The
head gasket 1 is formed with a plurality ofopenings 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 theopening 3 are water holes connected to cooling water passages formed in the cylinder head and cylinder block. - An
intermediate member 6 formed from a conductive material is connected to each of the plurality ofelectrode pairs 2, and by holding theintermediate members 6 in thehead gasket 1, the plurality ofelectrode pairs 2 are held on thehead gasket 1. In this example, theelectrode pairs 2 andintermediate 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 theopening 3 will be referred to as theintermediate member 6, and the part that extends in a gently curving S shape from theintermediate member 6 to the two sides and projects partially into theopening 3 will be referred to as theelectrode pair 2. - The plurality of
electrode pairs 2 are electrically connected in series via theintermediate members 6. Hence, when a high secondary voltage is applied to aterminal 7, discharge occurs first in the ignition gap of theelectrode pair 2 having the current-carryingelectrode 2a that is connected to theterminal 7, after which discharge occurs in theadjacent electrode pair 2 thereto. Discharge then occurs around theopening 3 in sequence from theterminal 7 side until finally, discharge occurs in the ignition gap of theelectrode pair 2 that is closest to anearth terminal 8. - Further, each
intermediate member 6 extends to a peripheral edge of theopening 3, and a tip end surface thereof is exposed to an inner peripheral surface of theopening 3. In the multipoint ignition device according to this invention, the heat value can be adjusted by modifying the surface area of this part (to be referred to hereafter as the "exposure area"). - To describe the heat value adjustment method specifically, to reduce the heat value of the multipoint ignition device (to make the multipoint ignition device a hot type ignition device), the exposure area of the
intermediate member 6 should be increased. When the exposure area increases, the amount of heat received by theintermediate member 6 from the combustion gas increases, making the temperature of theelectrode pair 2 less likely to fall, and thus the heat value of the multipoint ignition device can be reduced. - To increase the exposure area of the
intermediate member 6, a projection amount X by which theintermediate member 6 is caused to project into theopening 3 may be increased, as shown inFIG. 3 , or a width W of the exposed part of theintermediate member 6 may be increased, as shown inFIG. 4 . A height H of the exposed part of theintermediate member 6 may also be increased provided that electric leakage from theintermediate member 6 into the cylinder head and cylinder block does not occur. - When the
intermediate member 6 is caused to project into theopening 3, the heat value may be reduced further by bending atip end surface 6s of the projecting part to increase the surface area thereof, as shown inFIG. 5 . Any surface may be bent as long as it belongs to the projecting part. The surface area of the projecting part may also be increased by forming grooves, indentations, projections and the like on the surface instead of bending the surface. - Conversely, to raise the heat value of the multipoint ignition device (to make the multipoint ignition device a cold type ignition device), the exposure area of the
intermediate member 6 should be reduced, in contrast to a case in which the heat value is reduced. To reduce the heat value further, theintermediate member 6 may be completely buried in the interior of thehead gasket 1, as shown inFIG. 6 , to make the exposure area of theintermediate member 6 zero. - It should be noted that in this embodiment, the
intermediate member 6 extends to the peripheral edge of theopening 3 so as to be exposed to theopening 3, but a side hole extending in the diametrical direction of theopening 3 or a groove extending in the circumferential direction of theopening 3 may be formed in the inner peripheral surface of theopening 3 such that a part of theintermediate member 6 is exposed to theopening 3 via the side hole or groove. - Further, in this embodiment all of the
intermediate members 6 have the same exposure area, but when the heat value required for eachelectrode pair 2 is different, the exposure area of theintermediate member 6 may be modified according to its position. For example, theelectrode pair 2 on an exhaust port side has a higher temperature than theelectrode pair 2 on an intake port side, and therefore, by reducing the exposure area of theintermediate member 6 disposed on the exhaust port side, the heat value can be raised. - Furthermore, to realize wider-range heat value adjustment, the constitutions shown in
FIGs. 7 and8 may be employed where appropriate in addition to the constitutions described above. -
FIG. 7 shows a constitution in which theintermediate member 6 is formed from a plurality of materials having different thermal conductivity values, thereby enabling wider-range heat value adjustment. In this example, the part of theintermediate member 6 that is connected to theelectrode pair 2 and the vicinity of the part that is exposed to theopening 3 are formed from the same material as theelectrode pair 2, i.e. a material exhibiting excellent heat resistance such as nickel, whereas apart 6b on the opposite side of theopening 3 is formed from a material having high thermal conductivity such as copper. - According to this constitution, the amount of heat that is radiated from the
intermediate member 6 to the cylinder head and cylinder block through thehead gasket 1 increases, and as a result, the heat value of the multipoint ignition device can be raised. When an even greater heat value is required, the entireintermediate member 6 may be formed from a material having high thermal conductivity, such as copper. - In addition to the constitution shown in
FIG. 7 , theintermediate member 6 may be formed from a plurality of materials having different thermal conductivity values by forming the outer side of theintermediate member 6 from a material exhibiting excellent heat resistance, such as nickel, and burying a material having high thermal conductivity, such as copper, in the interior thereof (a shell structure). Alternatively, a material having high thermal conductivity, such as copper, may be sandwiched from both sides by a material exhibiting excellent heat resistance, such as nickel (a sandwich structure). Further, the material having high thermal conductivity, such as copper, may be applied in the form of a metal powder so that distortion caused by differences in the thermal expansion coefficient of the different materials can be absorbed. -
FIG. 8 shows a constitution in which aholding portion 1s of thehead gasket 1, which holds theintermediate member 6, is formed from an insulating material such as a ceramic, and apart 1e of thehead gasket 1 other than theholding portion 1s is formed from a different insulating material to the material of theholding portion 1s. - According to this constitution, by forming the
part 1e other than theholding portion 1s from a material having high thermal conductivity, such as aluminum, the amount of heat radiated from theintermediate member 6 to the cylinder head and cylinder block through thehead gasket 1 can be increased, enabling an increase in the heat value of the multipoint ignition device. Moreover, the amount of heat that is transferred from the cylinder head to the cylinder block through thehead gasket 1 increases, and therefore knocking, which occurs when the temperature of the cylinder head becomes excessive, can be suppressed. - Conversely, to lower the heat value of the multipoint ignition device, the
part 1e other than theholding portion 1s may be formed from a material having low thermal conductivity, such as zirconia, to reduce the amount of heat that is radiated from theintermediate member 6 to the cylinder head and cylinder block through thehead gasket 1. - It should be noted that the specific heat value adjustment methods described above may be executed in appropriate combinations, and in so doing, wider-range heat value adjustment can be realized.
Claims (5)
- A multipoint ignition device in which a plurality of electrode pairs (2), each constituting an ignition gap, are disposed around a cylinder opening portion of an engine, comprising:an interposed member (1) interposed between a cylinder head and a cylinder block of the engine, having an opening (3) in a position corresponding to the cylinder opening portion;
anda plurality of intermediate members (6) connected respectively to the plurality of electrode pairs (2) and held by the interposed member (1),characterized in thata part of at least one of the plurality of intermediate members (6) is exposed to the opening (3). - The multipoint ignition device as defined in Claim 1, wherein the part exposed to the opening (3) projects into the opening (3).
- The multipoint ignition device as defined in Claim 2, wherein an irregularity is formed on a surface of the projecting part.
- The multipoint ignition device as defined in any one of Claim 1 to Claim 3, wherein the intermediate member (6) and the plurality of electrode pairs (2) are formed from materials having different thermal conductivity values, or the intermediate member (6) is formed from a plurality of materials having different thermal conductivity values.
- The multipoint ignition device as defined in any one of Claim 1 to Claim 4, wherein a holding portion (1s) of the interposed member (1), which holds the plurality of intermediate members (6), and a part (1e) of the interposed member (1) other than the holding portion (1s) are formed from materials having different thermal conductivity values.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007200420A JP4079989B1 (en) | 2007-08-01 | 2007-08-01 | Multi-point ignition device |
JP2007203838A JP4139847B1 (en) | 2007-08-06 | 2007-08-06 | Multi-point ignition device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2020716A2 EP2020716A2 (en) | 2009-02-04 |
EP2020716A3 EP2020716A3 (en) | 2011-12-21 |
EP2020716B1 true EP2020716B1 (en) | 2012-08-01 |
Family
ID=39870598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20070021929 Active EP2020716B1 (en) | 2007-08-01 | 2007-11-12 | Multipoint ignition device |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP2020716B1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57185689A (en) * | 1981-05-09 | 1982-11-15 | Nippon Soken | Multipoint ignition plug |
JPH01193080A (en) | 1988-01-29 | 1989-08-03 | Mazda Motor Corp | Ignition device for engine |
JPH02123281A (en) | 1988-10-31 | 1990-05-10 | Mazda Motor Corp | Ignition device for engine |
JPH02238176A (en) | 1989-03-09 | 1990-09-20 | Mazda Motor Corp | Ignition device for engine |
-
2007
- 2007-11-12 EP EP20070021929 patent/EP2020716B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2020716A2 (en) | 2009-02-04 |
EP2020716A3 (en) | 2011-12-21 |
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