WO2017065310A1 - 点火装置 - Google Patents
点火装置 Download PDFInfo
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- WO2017065310A1 WO2017065310A1 PCT/JP2016/080651 JP2016080651W WO2017065310A1 WO 2017065310 A1 WO2017065310 A1 WO 2017065310A1 JP 2016080651 W JP2016080651 W JP 2016080651W WO 2017065310 A1 WO2017065310 A1 WO 2017065310A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P23/00—Other ignition
- F02P23/04—Other physical ignition means, e.g. using laser rays
- F02P23/045—Other physical ignition means, e.g. using laser rays using electromagnetic microwaves
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- 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
- F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
- F02P15/02—Arrangements having two or more sparking plugs
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- 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
- F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
- F02P15/08—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having multiple-spark ignition, i.e. ignition occurring simultaneously at different places in one engine cylinder or in two or more separate engine cylinders
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- 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
- F02P3/00—Other installations
- F02P3/01—Electric spark ignition installations without subsequent energy storage, i.e. energy supplied by an electrical oscillator
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- 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
- F02P9/00—Electric spark ignition control, not otherwise provided for
- F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
- F02P9/007—Control of spark intensity, intensifying, lengthening, suppression by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition
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- 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
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/22—Sparking plugs characterised by features of the electrodes or insulation having two or more electrodes embedded in insulation
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- 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
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
-
- 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
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/34—Sparking plugs characterised by features of the electrodes or insulation characterised by the mounting of electrodes in insulation, e.g. by embedding
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- 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
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/38—Selection of materials for insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/40—Sparking plugs structurally combined with other devices
- H01T13/44—Sparking plugs structurally combined with other devices with transformers, e.g. for high-frequency ignition
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/50—Sparking plugs having means for ionisation of gap
-
- 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
- H01T2/00—Spark gaps comprising auxiliary triggering means
- H01T2/02—Spark gaps comprising auxiliary triggering means comprising a trigger electrode or an auxiliary spark gap
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/52—Generating plasma using exploding wires or spark gaps
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
- H05H1/461—Microwave discharges
- H05H1/4622—Microwave discharges using waveguides
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
- H05H1/461—Microwave discharges
- H05H1/463—Microwave discharges using antennas or applicators
Definitions
- the present invention relates to an ignition device that is used in an internal combustion engine and ignites fuel.
- Patent Document 1 discloses a technique for expanding a flame ignited by irradiating a microwave after igniting fuel using a spark plug.
- Patent Document 2 an ignition device having a microwave resonance structure
- the ignition device of Patent Document 2 has a structure in which a microwave input from an external oscillator is boosted by a resonance structure, and a discharge is generated between a discharge electrode at the tip and a ground electrode. If a repetitive pulsed microwave is input from the outside, repetitive discharge can be performed and stable ignition can be performed. Moreover, since plasma (OH radicals) can be continuously supplied to the ignition region, lean combustion is possible. Since the diameter is about 4 mm, which is about 1/3 of a normal spark plug (diameter 12 mm), the diameter of the valve can be increased, which contributes to higher efficiency of the internal combustion engine. Moreover, since it has a small diameter, it is also suitable for an auxiliary ignition device for multipoint ignition.
- the ignition device of Patent Document 2 since the ignition device of Patent Document 2 has a small diameter, the volume of the discharge region is small. Therefore, when used for ignition of a fuel having inferior ignitability as compared with a large internal combustion engine or gasoline such as natural gas, the ignition power may be insufficient.
- an external circuit for example, a 50 ⁇ system
- a matching portion for matching the impedance of the resonance structure portion are provided inside the plug.
- impedance mismatch occurs due to a change in electrical resistance between the discharge electrode and the ground electrode, the microwave is reflected, and the microwave energy cannot be efficiently input to the plasma.
- measures such as microwave input waveform, level control, and circuit design in which impedance mismatching is unlikely to occur are taken, a fundamental solution is also desired.
- the present invention has been made in view of the above points.
- the present invention provides a rectangular parallelepiped first substrate and a second substrate, and one or a plurality of intermediate substrates provided between the first substrate and the second substrate and having a longer side shorter than the first and second substrates.
- the first substrate is provided with an input portion for receiving electromagnetic waves from the outside, a first electrode portion, and an electromagnetic wave transmission line for connecting the input portion and the first electrode portion on the surface on the intermediate substrate side.
- the second substrate is provided with an electromagnetic wave resonance part and a second electrode part electrically connected to the electromagnetic wave resonance part on the surface on the intermediate substrate side, the first electrode part, the second electrode part, and the electromagnetic wave transmission
- Each of the part of the line and the part of the resonance part is opposed to each other with a space at a place where the intermediate substrate is not provided.
- the stability of ignition by an ignition device using microwaves can be improved.
- FIG. 1 is an external view of a spark plug according to a first embodiment of the present invention.
- (A) is an exploded perspective view with the case removed,
- (b) is a view showing the back side of the first substrate, and
- (c) is an enlarged view of the front end portion of the front side of the second substrate.
- the ignition plug which concerns on 2nd Embodiment of this invention is shown, (a) is a whole top view, (b) is AA sectional drawing of (a), (c) is the front view seen from the discharge part side, d) is a perspective view showing a resonance electrode.
- the spark plug 1 of the present embodiment includes a first substrate 13, an intermediate substrate 14, an intermediate substrate 15, and a second substrate 16 in order from the upper side, and these four substrates are in a rectangular parallelepiped shape. In the case 11. Further, each of the four substrates is made of an insulating material such as ceramic.
- the SMA connector 12 to which a coaxial cable 29 (see FIG. 7 and the like) for transmitting a microwave generated by an external oscillator (not shown) is connected is attached to the left short side of the first substrate 13.
- a metal pattern 13b that prevents microwaves from leaking to the outside is formed over the entire surface.
- an electrode 13a is formed on the short side at the right end, and a microwave transmission path 13c, which is a stripline-shaped metal pattern, electrically connects the electrode 13a and the SMA connector 12. Formed to connect.
- a resonance part 16a is formed on the upper surface of the second substrate 16, and a discharge electrode 16b is formed on the short side on the right side so as to be electrically connected to the resonance part 16a, while a ground electrode 16c is connected to the discharge electrode 16b. Separated but formed close together. Further, a metal pattern 16d that prevents the microwave flowing through the resonance part 16a from leaking outside is formed on the entire bottom surface of the second substrate.
- the intermediate substrates 14 and 15 are arranged so as to be sandwiched between the first substrate 13 and the second substrate 14, and the length of the long side is shorter than that of the first substrate 13 and the second substrate 14. For this reason, the right side of the lower surface of the first substrate 13 and the right side of the upper surface of the second substrate 13 face each other with a space therebetween. That is, the first electrode 13a, the discharge electrode 16b, a part of the microwave transmission path 13c, and a part of the resonance part 16a are opposed to each other with a space at a location where the intermediate substrate 14 is not provided. This space functions as a coupling portion 17 for guiding the microwave flowing through the microwave transmission path 13c of the first substrate 13 to the resonance portion 16 of the second substrate 14 by electric field coupling.
- a metal pattern that shields the microwave flowing through the microwave transmission path 13 c of the first substrate 13 from the second substrate 16 is formed on the upper surface of the intermediate substrate 15. The metal pattern may be formed on the lower surface of the intermediate substrate 14.
- the microwave input from the SMA connector 12 is transmitted through the microwave transmission path 13c. Then, the microwave is guided to the resonance part 16 of the second substrate 14 by electric field coupling through the coupling part 17.
- the resonance unit 16 has a microwave resonance structure, and the microwave induced in the resonance unit 16 is boosted and becomes a high potential at the discharge electrode 16b. As a result, discharge occurs between the discharge electrode 16b and the ground electrode 16c (hereinafter, this discharge is referred to as “first discharge”). Plasma is generated by the first discharge, and this is used as a seed fire, and discharge is generated between the electrodes 13a of the first substrate 13 (hereinafter, this discharge is referred to as “second discharge”).
- the distance between the discharge electrode 16b and the ground electrode 16c is, for example, 0.3 mm.
- the distance between the discharge electrode 16b and the electrode 13a is 4 mm as an example. Therefore, the discharge volume of the second discharge is larger than that of the first discharge.
- the spark plug of the present invention since the discharge gap length of the spark plug of the conventional microwave resonance structure of Patent Document 2 is 0.3 mm, the spark plug of the present invention has a larger discharge volume than the conventional product and can generate a large plasma.
- FIG. 6A is an equivalent circuit of a resonance structure portion of a spark plug having a conventional microwave resonance structure.
- a microwave is input from an external microwave oscillator
- a current flows through the capacitor C1 from the left to the right in FIG.
- a strong resonance current flows in the loop circuit formed by the reactance L and the capacitors C3 and C2 by resonating with the frequency of the microwave
- a high voltage is generated particularly at both ends of the capacitor C3.
- Dielectric breakdown occurs at both ends, and discharge generates plasma.
- Both ends of the capacitor C3 are equivalent to a state in which the resistor Rp is connected in parallel from the released state.
- the impedance is changed from an originally impedance matching state with the 50 ⁇ external circuit to an inconsistent state, so that the microwave is reflected.
- FIG. 6B is an equivalent circuit of the resonance structure portion of the spark plug 1 according to the first embodiment of the present invention.
- both ends of the resistors Rp1 and Rp2 are considered to be equivalent to the released state.
- a microwave is input from an external microwave oscillator, first, a current flows through the capacitor C1.
- a strong resonance current flows through the loop circuit formed by the capacitors C3 and C2 and the reactance L in resonance with the microwave frequency, a high voltage is generated particularly at both ends of the capacitor C3. Dielectric breakdown occurs at both ends of the capacitor C3 and discharge occurs to generate plasma (this corresponds to the first discharge described above).
- the resistor Rp1 is changed from the released state to the state connected in parallel.
- the reflectance resulting from plasma generation is about 80%, but in the spark plug 1 according to the first embodiment of the present invention, the reflectance is suppressed to about 10%. It was confirmed experimentally that it was possible.
- FIG. 7 is a diagram illustrating an example in which the spark plug 1 is used in place of a spark plug.
- FIG. 8 shows an example in which the spark plug 1 is provided on the side of the combustion chamber.
- four spark plugs 1 (1A to 1D) are inserted between the cylinder block 26 and the cylinder head 27 (usually at a location where a gasket is inserted).
- an annular receiving antenna 43 is formed on the top surface of the piston 25.
- a microwave is fed to the spark plug 1 to cause the above-mentioned “second discharge”.
- this second discharge is also derived from the receiving antenna 43, and a large discharge can be generated between the spark plug 1 and the receiving antenna 43. Thereby, suppression of knocking or the like can be achieved.
- microwaves have been described as an example of electromagnetic waves, but electromagnetic waves in other wavelength ranges may be used.
- the internal combustion engine to which the present ignition device is applied is assumed to be a reciprocating gasoline engine or a rotary gasoline engine for automobiles, but may be applied to, for example, an engine using natural gas as fuel or an engine using light oil as fuel. .
- the first discharge is generated between the discharge electrode 16b and the ground electrode 16c.
- the metal part of the case 11 functions as the ground electrode, and the discharge is generated between the discharge electrode 16b and the case 11. You may make it produce.
- FIG. 9 shows an ignition device for multipoint ignition according to a reference example.
- Microwaves transmitted by the coaxial cable 29 are radiated from the planar antenna 41 provided in the cylinder head toward the combustion chamber 42 and received by the receiving antennas 43a to 43d provided on the top surface of the piston 25.
- Each receiving antenna 43 is composed of an 8 to 9 mm square patch antenna and a resonating part.
- the microwave received by the patch antenna part is boosted by the resonating part and discharged at the tip of the resonating part. Yes.
- multipoint ignition is to be realized.
- the spark plug according to the second embodiment is configured by further bundling a plurality of substrates each having a structure in which the substrates 13 to 16 are stacked.
- an example of bundling 9 pieces in 3 rows each in the vertical and horizontal directions is shown.
- one short side of the first substrate 13 of the plurality of spark plugs 1 serves as an electromagnetic wave input unit.
- a connector for example, SMA connector 12 for connecting to the coaxial cable 31 connected to the electromagnetic wave oscillator may be provided in each of the input units, and each may be connected to an external electromagnetic wave oscillator. The connection may be made via a distributor.
- each input part (the opposite end of the electrode 13a of the transmission line 13c) is electrically connected, and connected to one external electromagnetic wave oscillation, and electromagnetic waves (microwaves) are transmitted to each ignition plug without going through a distributor. 1 may be transmitted.
- the spark plug of the third embodiment is a spark plug in which the equivalent circuit (see FIG.
- the spark plug 3 is connected to a hollow cylindrical case 30 and an input portion 33 that is substantially coaxial with the case 30 and connected at one end to an external electromagnetic wave oscillator MW.
- a center electrode 31 having an antenna portion 31a that radiates electromagnetic waves supplied from the input portion 33 at the end, and a shield that covers the shaft portion 31b having a smaller diameter than the antenna portion 31a that connects the antenna portion 31a of the center electrode 31 and the input portion 33 It comprises a pipe 33, and a resonance electrode 32 comprising a discharge part 32a covering the antenna part 31a and a cylindrical resonance part 32b covering the shield pipe 33. Then, the electromagnetic wave supplied from the resonance unit Re is boosted to increase the potential difference between the discharge unit 32a and the ground electrode 30a formed at the tip of the case 30, and the primary plasma SP1 is generated.
- the discharge part 32a which covers the antenna part 31a which comprises the resonance electrode 32 may be a cylindrical part, as shown in FIG.11 (d), it is comprised so that it may become a semicircle shape. And the discharge part 32a and the resonance part 32b are connected by the connection part 32c which notched leaving the circular arc part of about 15 thru
- the resonance electrode 32 is manufactured by cutting out a thin cylindrical metal material.
- the ground electrode 30a formed at the tip of the case 30 is preferably formed with a plurality of notches (slits S) as shown in FIGS. 11 (b) to 11 (c). The ignitability to the air-fuel mixture when installed can be improved.
- the shield pipe 33 is a shield for preventing the electromagnetic wave supplied from the shaft portion 31b to the resonance portion 32b from being capacitively coupled, and is electrically insulated from the center electrode 31 and the resonance electrode 32.
- One end of the shield pipe 33 is formed integrally with the input portion 33 and is fixed to the anti-ground electrode side of the case 30.
- a ceramic pipe, ceramic powder, or the like may be filled as an insulator between the inner peripheral surface of the shield pipe 33 and the outer peripheral surface of the center electrode 31 for insulation.
- the insulating pipe has a step on the inner peripheral surface of the case 30 so that the resonance electrode 32 can be positioned. It is preferable to arrange the insulating pipe 34 along the shape of the gap between the outer peripheral surface of the shield pipe 33 and the inner peripheral surface of the resonance part 32b.
- an electromagnetic wave (2.45 GHz microwave in this embodiment) supplied from the external electromagnetic wave oscillator MW is transmitted from the antenna portion 31a of the center electrode 31 to the resonance portion 32b of the resonance electrode 32 via the discharge portion 32a.
- the voltage is boosted by the resonance portion Re formed between the outer peripheral surface and the inner peripheral surface of the case 30, and the potential difference between the discharge portion 32a of the resonance electrode 32 and the ground electrode 30a is increased.
- primary plasma SP1 is generated between the discharge part 32a and the ground electrode 30a.
- the antenna unit 31a and the discharge unit 32a form a capacitor that is capacitively coupled.
- the generation of the primary plasma SP1 causes impedance mismatch, but electromagnetic waves passing through the center electrode 31 not passing through the resonance part Re are supplied from the antenna part 31a to the primary plasma SP1. SP1 is maintained and expanded.
- the supplied electromagnetic waves are supplied in pulses, and the primary plasma SP1 is generated at approximately the same timing as the ignition timing with a general spark plug from 5 microseconds. It is preferable to supply an electromagnetic wave with an oscillation time of 20 microseconds, and thereafter oscillate with an oscillation time of 10 nanoseconds to 500 nanoseconds as short as possible. In this embodiment, oscillation occurs at 50 nanoseconds.
- the duty ratio is 30 to 80%, preferably 40 to 60%, and in this embodiment, the duty ratio is 50%.
- the electromagnetic wave is oscillated 300 to 1000 times, preferably 600 to 800 times, and about 700 times in this embodiment.
- the primary plasma SP1 is maintained and expanded, and the plasma is generated only by electromagnetic waves.
- reliable combustion can be maintained in a so-called super-lean state with a high air-fuel ratio.
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Abstract
Description
図1乃至図5を参照して、本実施形態の点火プラグ1は、上側から順に第1基板13、中間基板14、中間基板15、第2基板16からなり、これらの4つの基板は直方体状のケース11に収納される。また、上記の4つの基板はいずれもセラミック等の絶縁材料からなる。
図9は、参考例に係る、多点点火用の点火装置である。同軸ケーブル29により伝送されたマイクロ波を、シリンダヘッドに設けた平面アンテナ41から燃焼室42に向けて放射させ、これをピストン25の頂面に設けた受信アンテナ43a~43dで受信するようにする。各受信アンテナ43は、8~9mm角の平面パッチアンテナと、共振部とからなり、パッチアンテナ部で受信したマイクロ波が共振部で昇圧されて、共振部の先端部で放電する構造となっている。これにより、多点点火を実現しようとするものである。
実施形態2の点火プラグは、図10に示すように、各基板13~16を積層して点火プラグを構成したものをさらに複数束ねて構成するようにしている。図例では縦横それぞれ3列とした9個を束ねた例をしめすが、4列16個等、これらに限られるものではない。
<実施形態3>
実施形態3の点火プラグは、実施形態1で説明した基盤型点火プラグ1の等価回路(図6(b)参照)を円筒形上で実現した点火プラグである。この点火プラグ3は、図11に示すように、中空円筒状のケース30と、ケース30と略同軸状で、一端が外部の電磁波発振器MWと接続される入力部33と連結されるとともに、他端に入力部33から供給される電磁波を放射するアンテナ部31aを形成した中心電極31と、中心電極31のアンテナ部31aと入力部33を連結するアンテナ部31aより小径の軸部31bを覆うシールドパイプ33と、アンテナ部31aを覆う放電部32aとシールドパイプ33を覆う筒状の共振部32bとからなる共振電極32とから構成される。そして、共振部Reで供給される電磁波が昇圧され放電部32aとケース30の先端に形成された接地電極30aとの間の電位差が高められ、1次プラズマSP1が生成される。
12 SMAコネクタ
13 第1基板
13a 電極
13c マイクロ波伝送路
14 中間基板
15 中間基板
16 第2基板
16a 共振部
16b 中心電極
16c 接地電極
3 点火装置(点火プラグ)
30 ケース
31 中心電極
31a アンテナ
31b 軸部
32 共振電極
32a 放電部
32b 共振部
32c 連結部
33 シールドパイプ
Claims (5)
- 直方体状の第1基板及び第2基板と、
第1基板及び第2基板の間に設けられ、長辺の長さが第1及び第2基板よりも短い1又は複数の中間基板と、を備え、
第1基板には、外部からの電磁波の入力を受ける入力部、第1電極部、及び入力部と第1電極部を接続する電磁波伝送線路が中間基板側の面に設けられ、
第2基板には、電磁波共振部、電磁波共振部と電気的に接続された第2電極部が中間基板側の面に設けられており、
第1電極部と第2電極部、及び電磁波伝送線路の一部と共振部の一部のそれぞれが、中間基板の設けられていない箇所において空間を隔てて対向することを特徴とする点火装置。 - 前記入力部が第1基板の一方の短辺側に設けられ、前記第1電極部が該第1基板の他方の短辺側に設けられたことを特徴とする請求項1に記載の点火装置。
- 前記電磁波伝送線路を流れる電磁波が電界結合により前記共振部に誘導され、該誘導された電磁波が共振部により昇圧されることによって前記第2電極部において第1の放電を生じさせ、
この第1の放電を契機として、第2電極部と前記第1電極部の間で該第1の放電よりも放電体積が大きな第2の放電を生じさせることによって点火を行うことを特徴とする請求項1又は2に記載の点火装置。 - 前記第2基板には、前記第2電極部に近接して接地電極部が設けられており、前記第1の放電が該第2電極部と該接地電極部との間で生じることを特徴とする請求項1乃至3のいずれか1項に記載の点火装置。
- 中空円筒状のケースと、
該ケースと略同軸状で、一端が外部の電磁波発振器と接続される入力部を形成するとともに、他端に入力部から供給される電磁波を放射するアンテナ部を形成した中心電極と、
該中心電極のアンテナ部と入力部を連結する軸部を覆うシールドパイプと、
前記アンテナ部を覆う放電部と前記シールドパイプを覆う筒状の共振部とからなる共振電極とから構成される点火装置。
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EP16855561.3A EP3364509A4 (en) | 2015-10-16 | 2016-10-17 | Ignition device |
US15/768,693 US20180298873A1 (en) | 2015-10-16 | 2016-10-17 | Igniter |
JP2017545508A JPWO2017065310A1 (ja) | 2015-10-16 | 2016-10-17 | 点火装置 |
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JP2011150830A (ja) * | 2010-01-20 | 2011-08-04 | Denso Corp | 高周波プラズマ点火装置 |
JP2012127286A (ja) * | 2010-12-16 | 2012-07-05 | Denso Corp | 高周波プラズマ点火装置 |
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DE102004058925A1 (de) * | 2004-12-07 | 2006-06-08 | Siemens Ag | Hochfrequenz-Plasmazündvorrichtung für Verbrennungskraftmaschinen, insbesondere für direkt einspritzende Otto-Motoren |
EP3037651A4 (en) * | 2013-08-21 | 2017-04-26 | Imagineering, Inc. | Ignition system for internal combustion engine, and internal combustion engine |
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JP2011150830A (ja) * | 2010-01-20 | 2011-08-04 | Denso Corp | 高周波プラズマ点火装置 |
JP2012127286A (ja) * | 2010-12-16 | 2012-07-05 | Denso Corp | 高周波プラズマ点火装置 |
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US20180298873A1 (en) | 2018-10-18 |
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