JP2008175197A - Plasma type igniter - Google Patents
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Abstract
Description
本発明は、内燃機関の点火に用いられるプラズマ式点火装置の電磁ノイズ防止対策に関するものである。 The present invention relates to a measure for preventing electromagnetic noise in a plasma ignition device used for ignition of an internal combustion engine.
自動車エンジン等の内燃機関において、図１１（ａ）に示すような通常のスパークプラグ１０ｚを用いた点火装置は、バッテリ３１ｚとイグニッションスイッチ３２ｚと点火コイル３３ｚと電子制御装置（ＥＣＵ）３５ｚとイグナイタ（トランジスタ）３４ｚと整流素子２１ｚとスパークプラグ１０ｚとで構成されている。
図１１（ｂ）に示すように、イグニッションスイッチ３２ｚが投入され、ＥＣＵ３５ｚからの点火信号により、バッテリ３１ｚから低電圧の一次電圧が点火コイル３３ｚの一次コイル３３１ｚに印加され、次いで、イグナイタ３４ｚのスイッチングによって一次電圧が遮断されると点火コイル３３ｚ内の磁界が変化し、点火コイル３３ｚの二次コイル３３２ｚに−１０〜−３０ｋＶの二次電圧が発生し、中心電極１１０ｚと接地電極１３１ｚとで放電が起こり、高温域が狭い範囲で発生する。この時、二次コイル３３２ｚには、２ｍｓ程度の放電期間に３５ｍＡ程度のダイオード２１ｚで整流された電流が流れ、約３５ｍＪのエネルギーが放出される。通常のスパークプラグ１０ｚによる点火では、この高温域が点火源となって圧縮混合気の着火爆発が励起される。
In an internal combustion engine such as an automobile engine, an ignition device using a normal spark plug 10z as shown in FIG. 11A includes a battery 31z, an ignition switch 32z, an ignition coil 33z, an electronic control unit (ECU) 35z, an igniter ( Transistor) 34z, rectifying element 21z, and spark plug 10z.
As shown in FIG. 11B, the ignition switch 32z is turned on, and a low voltage primary voltage is applied from the battery 31z to the primary coil 331z of the ignition coil 33z by the ignition signal from the ECU 35z, and then the igniter 34z is switched. When the primary voltage is interrupted by this, the magnetic field in the ignition coil 33z changes, and a secondary voltage of −10 to −30 kV is generated in the secondary coil 332z of the ignition coil 33z, and discharge occurs between the center electrode 110z and the ground electrode 131z. Occurs in a narrow high temperature range. At this time, a current rectified by the diode 21z of about 35 mA flows in the secondary coil 332z during a discharge period of about 2 ms, and energy of about 35 mJ is released. In the normal ignition by the spark plug 10z, this high temperature region serves as an ignition source to excite the ignition explosion of the compressed mixture.
これに対して、図１０（ａ）に示すようなプラズマ式点火装置１ｘは、第１のバッテリ３１ｘと、イグニッションスイッチ３２ｘと点火コイル３３ｘと電子制御装置（ＥＣＵ）３５ｘとイグナイタ（トランジスタ）３４ｘと整流素子２１ｘとを含む放電用電源回路３ｘと、第２のバッテリ４１ｘと、抵抗４２ｘとプラズマ発生用コンデンサ４３ｘと整流素子２２ｘとを含むプラズマ発生用電源回路４ｘとが接続されたプラズマ式点火プラグ１０ｘとによって構成されている。
図１０（ｂ）に示すように、イグニッションスイッチ３２ｘが投入され、ＥＣＵ３５ｘからの点火信号により、第１のバッテリ３１ｘから低電圧の一次電圧が点火コイル３３ｘの一次コイル３３１ｘに印加され、イグナイタ３４ｘのスイッチングによって一次電圧が遮断されると、点火コイル３３ｘ内の磁界が変化し、点火コイル３３ｘの二次コイル３３２ｘに−１０〜−３０ｋＶの二次電圧が発生する。
更に、中心電極１１０ｘと接地電極１３１ｘとの間の放電距離２０１ｘに比例する放電電圧に達し、放電が開始する瞬間に、第１のバッテリ３１ｘとは別に設けたプラズマ発生用バッテリ４１ｘからプラズマ発生用コンデンサ４３ｘに蓄えられたエネルギーを中心電極１１０ｘと接地電極１５４ｘとの間に形成された放電空間１４０ｘ内に一気に放出し、放電空間１４０ｘ内の気体を高温高圧のプラズマ状態として噴射する。この時、約１００ｍＪの高いエネルギーが放出される。
プラズマ式点火装置１ｘによる点火では、このような極めて高いエネルギーによって、容積的に大きな範囲の高温域が発生する上に、指向性に富んだ火炎核が着火源となって圧縮混合気の着火爆発が励起される。
そこで、プラズマ式点火装置１ｘは、直噴エンジンの燃焼において希薄な混合気を燃焼させるため、点火プラグの付近に濃い混合気が集まるようにして、燃焼を容易にする成層燃焼への応用が期待されている。
In contrast, a plasma ignition device 1x as shown in FIG. 10A includes a first battery 31x, an ignition switch 32x, an ignition coil 33x, an electronic control unit (ECU) 35x, and an igniter (transistor) 34x. A plasma ignition plug in which a discharge power supply circuit 3x including a rectifying element 21x, a second battery 41x, a resistor 42x, a plasma generating capacitor 43x, and a plasma generating power supply circuit 4x including a rectifying element 22x are connected. 10x.
As shown in FIG. 10 (b), the ignition switch 32x is turned on, and a low voltage primary voltage is applied from the first battery 31x to the primary coil 331x of the ignition coil 33x by the ignition signal from the ECU 35x. When the primary voltage is cut off by switching, the magnetic field in the ignition coil 33x changes, and a secondary voltage of −10 to −30 kV is generated in the secondary coil 332x of the ignition coil 33x.
Furthermore, when a discharge voltage proportional to the discharge distance 201x between the center electrode 110x and the ground electrode 131x is reached and discharge starts, the plasma generating battery 41x provided separately from the first battery 31x is used for generating plasma. The energy stored in the capacitor 43x is discharged at once into the discharge space 140x formed between the center electrode 110x and the ground electrode 154x, and the gas in the discharge space 140x is injected as a high-temperature and high-pressure plasma state. At this time, high energy of about 100 mJ is released.
In the ignition by the plasma igniter 1x, such extremely high energy generates a high-temperature region in a large volume range, and a flame nucleus having a high directivity serves as an ignition source to ignite the compressed air-fuel mixture. The explosion is excited.
Therefore, the plasma ignition device 1x is expected to be applied to stratified combustion that facilitates combustion by collecting a rich air-fuel mixture in the vicinity of the ignition plug in order to burn a lean air-fuel mixture in the combustion of a direct injection engine. Has been.
しかし、プラズマ式点火装置１ｘにおいては、プラズマ発生用コンデンサ４３ｘ内に蓄えられたエネルギーを瞬時にプラズマ式点火プラグへ供給するので、図１０（ｂ）に示すように８μｓｅｃ程度の放電期間に１２０Ａ程度の大電流が流れる。これがエンジンの回転に応じて周期的に繰り返されるので、高周波の電磁ノイズが発生する。
この様な電磁ノイズは車両に搭載された電子制御装置の誤動作等を引き起こし、エンジンの失火に至る虞がある。
そこで、かかる電磁ノイズの防止方法として、特許文献１には、プラズマ発生用配線上でプラズマ式点火プラグの可及的近傍にステアリングダイオードを介装し、プラズマ発生用配線をシールド線で構成することにより、放電用電源からの給電電圧の低下を招くことなく、電磁ノイズを遮断する方法が開示されている。
However, in the plasma ignition device 1x, the energy stored in the plasma generating capacitor 43x is instantaneously supplied to the plasma ignition plug, so that the discharge period of about 8 μsec is about 120 A as shown in FIG. 10B. Large current flows. Since this is periodically repeated according to the rotation of the engine, high-frequency electromagnetic noise is generated.
Such electromagnetic noise may cause malfunction or the like of an electronic control device mounted on the vehicle, leading to engine misfire.
Therefore, as a method for preventing such electromagnetic noise, Patent Document 1 discloses that a steering diode is interposed as close as possible to the plasma ignition plug on the plasma generation wiring, and the plasma generation wiring is configured by a shield wire. Thus, a method for shutting off electromagnetic noise without causing a decrease in the power supply voltage from the discharge power supply is disclosed.
ところが、従来の方法では、電磁ノイズを遮断するためにプラズマ発生用配線に、シールド線を用いる必要があるので、プラズマ発生用配線の可撓性が低下し配線作業が困難となる。
また、シールドの不完全な所があれば電磁ノイズは漏れるので、放電用配線およびプラズマ発生用配線とプラグキャップとの全体をシールドする必要があり、近年の複雑化したエンジンルーム内で使用するには汎用性に欠け、搭載性が劣る。
しかも、シールドが広範囲に渡ると、シールド自身がアンテナとして機能し、電磁ノイズを発信してしまう虞もある。
However, in the conventional method, since it is necessary to use a shield wire for the plasma generation wiring in order to cut off electromagnetic noise, the flexibility of the plasma generation wiring is lowered and the wiring work becomes difficult.
In addition, electromagnetic noise will leak if there is an imperfect shield, so it is necessary to shield the discharge wiring, plasma generation wiring, and the plug cap as a whole, and it can be used in the recently complicated engine room. Lacks versatility and is inferior in mountability.
In addition, when the shield covers a wide area, the shield itself functions as an antenna and may cause electromagnetic noise.
更に、シールドとプラズマ発生用配線との間に形成される浮遊容量は、曲げによって不規則に変化するため、新たな電磁ノイズの発生源となる虞もある。
加えて、上記点火コイルと放電場としてのプラズマ式点火プラグとによって発信回路が形成され、上記点火コイルから二次電圧が加わり放電を開始する時に電磁ノイズが発生し、上記プラズマ発生用配線がアンテナとなって外部に漏れる虞もある。
しかしながら、上述した如く上記プラズマ発生用配線には大電流を流さなければならないので、上記プラズマ発生用配線上に抵抗を介装して放電開始時の電磁ノイズの発生を防止することはできない。
Furthermore, since the stray capacitance formed between the shield and the plasma generation wiring changes irregularly due to bending, it may become a new source of electromagnetic noise.
In addition, a transmission circuit is formed by the ignition coil and a plasma spark plug as a discharge field, and electromagnetic noise is generated when a secondary voltage is applied from the ignition coil to start discharge, and the plasma generation wiring is connected to the antenna. There is also a risk of leaking outside.
However, since a large current must flow through the plasma generation wiring as described above, it is impossible to prevent the generation of electromagnetic noise at the start of discharge by interposing a resistor on the plasma generation wiring.
そこで、本願発明は、かかる実情に鑑み、プラズマ式点火装置において、搭載が容易であると共に、不可避的に発生する電磁ノイズの外部への放出を防止する効果に優れたプラズマ式点火装置の提供を目的とするものである。 Therefore, in view of such circumstances, the present invention provides a plasma ignition device that is easy to mount and excellent in the effect of preventing the unavoidable generation of electromagnetic noise to the outside. It is the purpose.
請求項１の発明では、少なくとも１以上のバッテリと、上記バッテリの一次電圧を高圧の二次電圧に昇圧する点火コイルと、電子制御装置により開閉制御され上記点火コイルの作動を制御するイグナイタとを具備する放電用電源回路と、上記バッテリにより充電されるプラズマ発生用コンデンサを具備するプラズマ発生用電源回路と、内燃機関に装着され、上記放電用電源回路からの高電圧の印加と上記プラズマ発生用電源回路からの電力供給とにより、中心電極と絶縁碍子と接地電極とで形成された筒状の放電空間内の気体を高温高圧のプラズマ状態にして内燃機関の燃焼室内に噴射して点火するプラズマ式点火プラグと、上記放電用電源回路と上記中心電極とをつなぐ放電用配線と、上記プラズマ発生用電源回路と上記中心電極とをつなぐプラズマ発生用配線とによって構成されるプラズマ式点火装置であって、上記放電用配線上に設けられ上記プラズマ発生用電源回路からの電流の上記放電用電源回路への流入を阻止する第１の整流素子と、上記プラズマ発生用配線上に設けられ上記放電用電源回路からの電流の上記プラズマ発生用電源回路への流入を阻止する第２の整流素子と、上記プラズマ発生用電源回路と上記第２の整流素子との間に上記第２の整流素子と並列に介装される電磁ノイズ防止用コンデンサとを含んで電磁ノイズ低減回路部を構成し、上記電磁ノイズ低減回路部を上記中心電極の可及的近傍に設ける。 According to a first aspect of the present invention, there is provided at least one battery, an ignition coil that boosts the primary voltage of the battery to a high secondary voltage, and an igniter that is controlled by an electronic control unit to control the operation of the ignition coil. A discharge power supply circuit provided; a plasma generation power supply circuit including a plasma generation capacitor charged by the battery; and an application of a high voltage from the discharge power supply circuit and the plasma generation mounted on an internal combustion engine. Plasma that is ignited by injecting the gas in the cylindrical discharge space formed by the center electrode, the insulator and the ground electrode into a high-temperature and high-pressure plasma state into the combustion chamber of the internal combustion engine by supplying power from the power supply circuit A spark plug, a discharge wiring connecting the discharge power circuit and the center electrode, and connecting the plasma generating power circuit and the center electrode. A plasma ignition device configured with a plasma generation wiring, wherein the first rectification is provided on the discharge wiring and prevents current from the plasma generation power supply circuit from flowing into the discharge power supply circuit. An element, a second rectifier element provided on the plasma generation wiring and blocking current flowing from the discharge power supply circuit to the plasma generation power supply circuit, the plasma generation power supply circuit, and the second An electromagnetic noise reducing circuit unit including an electromagnetic noise preventing capacitor interposed in parallel with the second rectifying element between the rectifying element and the electromagnetic noise reducing circuit unit. Provide as close as possible.
請求項１の発明によれば、電磁ノイズ防止用コンデンサを第１の整流素子と第２の整流素子との間ではなく、プラズマ発生用電源と第２の整流素子との間で、プラズマ式点火プラグの中心電極の可及的近傍に設けることにより、電磁ノイズ防止用コンデンサによる放電電圧の減衰を伴うことなく、放電時に発生する高周波のノイズ電流のみをバイパスして電磁ノイズの外部への発信を防止できる。
従って、内燃機関においてプラズマ式点火プラグによる希薄混合気の成層燃焼が実現可能となる。
加えて、プラズマ発生用配線にシールド線を使用する必要がなくなるので、配線の作業性も向上する。
更に、複数の気筒によって構成される内燃機関の各気筒に装着されたプラズマ式点火プラグに接続される複数の配送線を一括でシールドし、接地電位を安定化することも可能となる。
According to the first aspect of the present invention, the electromagnetic noise prevention capacitor is not connected between the first rectifying element and the second rectifying element, but between the plasma generating power source and the second rectifying element. By providing it as close as possible to the center electrode of the plug, electromagnetic noise can be transmitted to the outside by bypassing only the high-frequency noise current generated during discharge without attenuation of the discharge voltage by the electromagnetic noise prevention capacitor. Can be prevented.
Accordingly, stratified combustion of a lean air-fuel mixture using a plasma ignition plug can be realized in an internal combustion engine.
In addition, since it is not necessary to use a shield wire for the plasma generating wiring, the workability of the wiring is improved.
Furthermore, it is also possible to stabilize a ground potential by collectively shielding a plurality of delivery lines connected to a plasma spark plug mounted on each cylinder of an internal combustion engine composed of a plurality of cylinders.
請求項２の発明では、少なくとも１以上のバッテリと、上記バッテリの一次電圧を高圧の二次電圧に昇圧する点火コイルと、電子制御装置により開閉制御され上記点火コイルの作動を制御するイグナイタとを具備する放電用電源回路と、上記バッテリにより充電されるプラズマ発生用コンデンサを具備するプラズマ発生用電源回路と、内燃機関に装着され、上記放電用電源回路からの高電圧の印加と上記プラズマ発生用電源回路からの電力供給とにより、中心電極と絶縁碍子と接地電極とで形成された筒状の放電空間内の気体を高温高圧のプラズマ状態にして内燃機関の燃焼室内に噴射して点火するプラズマ式点火プラグと、上記放電用電源回路と上記中心電極とをつなぐ放電用配線と、上記プラズマ発生用電源回路と上記中心電極とをつなぐプラズマ発生用配線とによって構成されるプラズマ式点火装置であって、上記放電用配線上に設けられ上記プラズマ発生用電源回路からの電流の上記放電用電源回路への流入を阻止する第１の整流素子と、上記プラズマ発生用配線上に設けられ上記放電用電源回路からの電流の上記プラズマ発生用電源回路への流入を阻止する第２の整流素子と、上記プラズマ発生用電源回路と上記第２の整流素子との間に上記第２の整流素子と並列に介装される上記プラズマ発生用コンデンサの一部または全部とを含んで電磁ノイズ低減回路部を構成し、上記電磁ノイズ低減回路部を上記中心電極の可及的近傍に設ける。 According to a second aspect of the present invention, there is provided at least one battery, an ignition coil that boosts the primary voltage of the battery to a high secondary voltage, and an igniter that is controlled by an electronic control device to control the operation of the ignition coil. A discharge power supply circuit provided; a plasma generation power supply circuit including a plasma generation capacitor charged by the battery; and an application of a high voltage from the discharge power supply circuit and the plasma generation mounted on an internal combustion engine. Plasma that is ignited by injecting the gas in the cylindrical discharge space formed by the center electrode, the insulator, and the ground electrode into a high-temperature and high-pressure plasma state into the combustion chamber of the internal combustion engine by supplying power from the power supply circuit A spark plug, a discharge wiring connecting the discharge power circuit and the center electrode, and connecting the plasma generating power circuit and the center electrode. A plasma ignition device configured with a plasma generation wiring, wherein the first rectification is provided on the discharge wiring and prevents current from the plasma generation power supply circuit from flowing into the discharge power supply circuit. An element, a second rectifier element provided on the plasma generation wiring and blocking current flowing from the discharge power supply circuit to the plasma generation power supply circuit, the plasma generation power supply circuit, and the second A part or all of the plasma generating capacitor interposed in parallel with the second rectifying element between the rectifying element and the electromagnetic noise reducing circuit part. Provided as close as possible to the center electrode.
請求項２の発明によれば、プラズマ発生用コンデンサをプラズマ発生用電源と第２の整流素子との間で、プラズマ式点火プラグの中心電極の可及的近傍に設けることにより、プラズマ発生用コンデンサが電磁ノイズ低減用コンデンサとして機能し、プラズマ発生用コンデンサによる放電電圧の減衰を伴うことなく、放電時に発生する高周波のノイズ電流のみをバイパスして電磁ノイズの外部への発信を防止できる。
従って、内燃機関においてプラズマ式点火プラグによる希薄混合気の成層燃焼が実現可能となる。
加えて、プラズマ発生用コンデンサを電磁ノイズ低減用コンデンサとして兼用できるので、プラズマ式点火装置の小型化が可能となり搭載性が更に向上する。
According to the invention of claim 2, the plasma generating capacitor is provided as close as possible to the center electrode of the plasma ignition plug between the plasma generating power source and the second rectifying element. Functions as a capacitor for reducing electromagnetic noise, and bypasses only high-frequency noise current generated at the time of discharge without attenuation of the discharge voltage by the plasma generating capacitor, thereby preventing electromagnetic noise from being transmitted to the outside.
Accordingly, stratified combustion of a lean air-fuel mixture using a plasma ignition plug can be realized in an internal combustion engine.
In addition, since the plasma generating capacitor can also be used as an electromagnetic noise reducing capacitor, the plasma ignition device can be miniaturized and the mountability is further improved.
請求項３の発明では、上記電磁ノイズ低減回路部を上記プラズマ式点火プラグの周辺に配設したケース内に載置する。 According to a third aspect of the present invention, the electromagnetic noise reduction circuit section is placed in a case disposed around the plasma ignition plug.
上記電磁ノイズ低減回路部を構成する上記第１の整流素子と、上記第２の整流素子と上記電磁ノイズ低減用コンデンサとをバラバラに載置すると上記プラズマ式点火プラグでの放電より発生した電磁ノイズが第２の整流素子に伝わり、更に第２の整流素子から外部に広がってしまう。
請求項３の発明によれば、上記第１の整流素子と、上記第２の整流素子と上記電磁ノイズ低減用コンデンサとを一つのケースにまとめることで上記電磁ノイズ低減回路部を上記プラズマ式点火プラグの中心電極の可及的近傍に装着することが容易にできる上に、プラズマ式点火プラグの体格をあまり大きくすることなくの電磁ノイズの放出を防止できる。 従って、搭載が容易であると共に電磁ノイズ放出防止効果に優れたプラズマ式点火装置が実現できる。
When the first rectifying element, the second rectifying element, and the electromagnetic noise reducing capacitor constituting the electromagnetic noise reducing circuit unit are placed apart, the electromagnetic noise generated by the discharge of the plasma ignition plug Is transmitted to the second rectifying element and further spreads from the second rectifying element to the outside.
According to a third aspect of the present invention, the electromagnetic noise reduction circuit unit is integrated with the plasma ignition by combining the first rectifying element, the second rectifying element, and the electromagnetic noise reducing capacitor in one case. It can be easily mounted as close as possible to the center electrode of the plug, and emission of electromagnetic noise can be prevented without increasing the size of the plasma ignition plug. Accordingly, it is possible to realize a plasma ignition device that is easy to mount and excellent in the effect of preventing electromagnetic noise emission.
請求項４の発明では、上記ケースは、少なくとも上記第１の整流素子と上記第２の整流素子とを上記内燃機関のエンジンブロックに穿設されたプラグホール内に載置する。 According to a fourth aspect of the present invention, the case places at least the first rectifying element and the second rectifying element in a plug hole formed in an engine block of the internal combustion engine.
請求項４の発明によれば、上記エンジンブロックが電磁シールドとして作用し、発生した電磁ノイズの外部へのリークを遮断できる。
従って、上記放電用電源回路と上記プラズマ発生用電源回路と上記放電用配線と上記プラズマ発生用配線とに渡って上記プラズマ点火式装置全体を完全にシールドせずとも良く、プラズマ式点火装置の搭載性が更に向上する。
According to the invention of claim 4, the engine block acts as an electromagnetic shield, and the leakage of the generated electromagnetic noise to the outside can be blocked.
Therefore, it is not necessary to completely shield the entire plasma ignition device across the discharge power supply circuit, the plasma generation power supply circuit, the discharge wiring, and the plasma generation wiring. The property is further improved.
請求項５の発明では、上記ケースは、樹脂からなる絶縁部材によって、上記電磁ノイズ低減回路部をその内側に保持し、上記電磁ノイズ低減回路部に含まれるコンデンサに接続され該コンデンサを接地状態する電磁シールドによって、上記ケースの表面の全部または一部を覆う。 According to a fifth aspect of the present invention, the case holds the electromagnetic noise reduction circuit section inside by an insulating member made of resin, and is connected to a capacitor included in the electromagnetic noise reduction circuit section to ground the capacitor. All or part of the surface of the case is covered with an electromagnetic shield.
請求項５の発明によれば、上記第２の整流素子に接続されている上記プラズマ発生用配線に大電流が流れたときに電磁ノイズが発生しても、上記電磁シールドによって上記ケースの外部へ漏れるのを防ぐことができる。
また、上記ケースは、樹脂によって上記電磁ノイズ低減回路部を保持するので、形状の自由度が高く、複雑な形状であっても容易に形成できる。
更に、上記ケースを用いることによってシールド容量の個体差を小さくすることができるので、多気筒エンジンに複数のプラズマ式点火プラグを装着した場合でも電磁シールド間に浮遊容量の差による電位差が発生することがなく、新たな電磁ノイズ発生原とならない。
従って、プラズマ式点火装置の更なる電磁ノイズ低減と搭載性の向上を図ることができる。
According to the invention of claim 5, even if electromagnetic noise is generated when a large current flows through the plasma generation wiring connected to the second rectifying element, the electromagnetic shield causes the outside of the case. Leakage can be prevented.
Moreover, since the said case hold | maintains the said electromagnetic noise reduction circuit part with resin, the freedom degree of a shape is high and it can form easily even if it is a complicated shape.
Furthermore, since the individual differences in the shield capacity can be reduced by using the above case, a potential difference due to the difference in stray capacity occurs between the electromagnetic shields even when multiple plasma ignition plugs are mounted on a multi-cylinder engine. There is no new source of electromagnetic noise.
Therefore, it is possible to further reduce electromagnetic noise and improve mountability of the plasma ignition device.
請求項６の発明では、上記電磁シールドは、少なくとも上記ケースの上記プラグホールから露出する範囲を覆うように施す。 According to a sixth aspect of the invention, the electromagnetic shield is provided so as to cover at least a range exposed from the plug hole of the case.
請求項６の発明によれば、上記エンジンブロック自体が電磁シールドとして作用するのに加えて、上記プラグホールから露出する部分に電磁シールドを施すことで電磁ノイズの漏れを更に防止できる。 According to the invention of claim 6, in addition to the engine block itself acting as an electromagnetic shield, leakage of electromagnetic noise can be further prevented by applying an electromagnetic shield to a portion exposed from the plug hole.
請求項７の発明では、上記ケースは、上記プラズマ式点火プラグの頭部を覆うプラグキャップと一体的に形成する。 According to a seventh aspect of the present invention, the case is formed integrally with a plug cap that covers the head of the plasma ignition plug.
請求項７の発明によれば、電磁ノイズ低減回路部のプラズマ式点火プラグへの装着が容易にできる上に、プラズマ式点火プラグの体格をあまり大きくすることなくの電磁ノイズの発生を防止できる。
従って、搭載が容易であると共に電磁ノイズ発生防止効果に優れたプラズマ式点火装置が実現できる。
According to the invention of claim 7, it is possible to easily attach the electromagnetic noise reduction circuit section to the plasma spark plug, and to prevent generation of electromagnetic noise without enlarging the size of the plasma spark plug.
Therefore, it is possible to realize a plasma ignition device that is easy to mount and excellent in electromagnetic noise generation prevention effect.
請求項８の発明では、上記電磁ノイズ低減回路部と上記中心電極との距離を３０ｃｍ以下、より好ましくは１５ｃｍ以下に設定する。 In the invention of claim 8, the distance between the electromagnetic noise reduction circuit section and the center electrode is set to 30 cm or less, more preferably 15 cm or less.
電磁ノイズ低減回路部と中心電極との距離が長くなると両者を接続する配線も長くなり、電磁ノイズ低減回路部と中心電極との配線がアンテナとして機能し、点火コイルとプラズマ式点火プラグとこのアンテナとで発信回路を形成してしまう。
このため、電磁ノイズ低減回路と中心電極との距離が長いほど電磁ノイズは大きくなり、電磁ノイズ低減回路部と中心電極との距離を３０ｃｍよりも離した場合、電磁ノイズ低減用コンデンサによるノイズ電流の吸収ができなくなる。
請求項８の発明により、電磁ノイズ低減回路と中心電極との距離を上記範囲内に設定すれば、電磁ノイズ低減用コンデンサにより、ノイズ電流が有効に吸収され、プラズマ式点火装置による内燃機関の点火が実現可能となる。
When the distance between the electromagnetic noise reduction circuit section and the center electrode becomes longer, the wiring connecting the both becomes longer, and the wiring between the electromagnetic noise reduction circuit section and the center electrode functions as an antenna. The ignition coil, the plasma ignition plug, and this antenna And form a transmission circuit.
For this reason, the longer the distance between the electromagnetic noise reduction circuit and the center electrode, the larger the electromagnetic noise. When the distance between the electromagnetic noise reduction circuit section and the center electrode is more than 30 cm, the noise current generated by the electromagnetic noise reduction capacitor is reduced. Absorption is impossible.
According to the invention of claim 8, if the distance between the electromagnetic noise reduction circuit and the center electrode is set within the above range, the noise current is effectively absorbed by the electromagnetic noise reduction capacitor, and the internal combustion engine is ignited by the plasma ignition device. Is feasible.
請求項９の発明では、上記放電用配線は、高圧抵抗線によって形成する。 According to a ninth aspect of the present invention, the discharge wiring is formed by a high voltage resistance wire.
請求項９の発明によれば、高圧抵抗線の抵抗と浮遊容量との濾波作用によって放電用配線上における電磁ノイズの発生を防止できる。 According to invention of Claim 9, generation | occurrence | production of the electromagnetic noise on the wiring for discharge can be prevented by the filtering action of the resistance of a high voltage | pressure resistance wire, and a stray capacitance.
請求項１０の発明では、上記電磁ノイズ低減回路部は、上記中心電極に接続される第１のターミナルと上記放電用配線に接続される第２のターミナルと上記プラズマ発生用配線に接続される第３のターミナルとを具備し、上記電磁ノイズ低減回路部内において、上記第２のターミナルの取出方向と上記第３のターミナルの取出方向とが略直交する位置に載置する。 In a tenth aspect of the present invention, the electromagnetic noise reduction circuit section includes a first terminal connected to the center electrode, a second terminal connected to the discharge wiring, and a second terminal connected to the plasma generation wiring. 3 and is placed in a position in which the extraction direction of the second terminal and the extraction direction of the third terminal are substantially orthogonal in the electromagnetic noise reduction circuit section.
請求項１０の発明によれば、上記第２のターミナルに印加される高電圧の上記電磁ノイズ低減用コンデンサへのリークを防ぐことができる。
従って、プラズマ式点火装置の信頼性が更に向上する。
According to the invention of claim 10, it is possible to prevent leakage of the high voltage applied to the second terminal to the electromagnetic noise reducing capacitor.
Therefore, the reliability of the plasma ignition device is further improved.
以下、本発明の第１の実施形態について、図１、２を参照して説明する。
図１に示すように、本実施形態におけるプラズマ式点火装置１は、プラズマ式点火プラグ１０とプラグキャップ２内に設けられた電磁ノイズ低減回路部２０と放電用電源３とプラズマ発生用電源４と放電用配線３６とプラズマ発生用配線４４とで構成されている。
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the plasma ignition device 1 according to the present embodiment includes a plasma ignition plug 10, an electromagnetic noise reduction circuit unit 20 provided in a plug cap 2, a discharge power supply 3, and a plasma generation power supply 4. It is composed of a discharge wiring 36 and a plasma generation wiring 44.
プラズマ式点火プラグ１０は、エンジンブロック５１とシリンダーブロック５３とで形成される内燃機関の燃焼室５内に先端が露出するようにエンジンブロック５１に設けられたプラグホール５２内で装着されている。
プラズマ式点火プラグ１０は、導電性の金属材料からなる円柱状の中心電極１１０と上記中心電極１１０を絶縁保持する筒形の絶縁碍子１２０と絶縁碍子１２０を覆う有底筒状の金属製のハウジング１３０とによって構成されている。
中心電極１１０の基端側は中心電極ターミナル部１１１と導通している。
The plasma ignition plug 10 is mounted in a plug hole 52 provided in the engine block 51 so that the tip is exposed in the combustion chamber 5 of the internal combustion engine formed by the engine block 51 and the cylinder block 53.
The plasma ignition plug 10 includes a cylindrical center electrode 110 made of a conductive metal material, a cylindrical insulator 120 that insulates and holds the center electrode 110, and a bottomed cylindrical metal housing that covers the insulator 120. 130.
The proximal end side of the center electrode 110 is electrically connected to the center electrode terminal portion 111.
ハウジング１３０の先端部は、内側に向かって屈曲し、環状の接地電極開口部１３２を有する接地電極１３１となっている。
中心電極１１０の先端平面と絶縁碍子１２０の内側面と接地電極開口部１３２の内側面とで放電空間１４０を形成している。
ハウジング１３０の先端側外周部には、エンジンブロック５１に設けられたプラグホール５２に固定するとともにハウジング１３０とエンジンブロック５１とを電気的に接地状態とするためのハウジングネジ部１３２が形成され、基端側外周部にはネジ部１３２を締め付けるためのハウジング六角部１３３が形成されている。
The front end portion of the housing 130 is bent toward the inside to form a ground electrode 131 having an annular ground electrode opening 132.
A discharge space 140 is formed by the tip plane of the center electrode 110, the inner side surface of the insulator 120, and the inner side surface of the ground electrode opening 132.
A housing screw portion 132 for fixing the housing 130 and the engine block 51 to an electrically grounded state while being fixed to the plug hole 52 provided in the engine block 51 is formed on the outer peripheral portion on the front end side of the housing 130. A housing hexagonal portion 133 for fastening the screw portion 132 is formed on the outer peripheral portion on the end side.
プラグキャップ２は、本発明の要部である電磁ノイズ低減回路部２０と、電磁ノイズ低減回路部２０を覆うエポキシ樹脂等からなる絶縁樹脂モールド２５１と、プラズマ式点火プラグ１０の絶縁碍子頭部１２１に嵌着せしめるべく弾性部材により筒状に形成された絶縁シール部２５０と、中心電極ターミナル部１１１に接続される第１のターミナル２１０と、放電用配線３６の放電用配線ターミナル部３６１に接続される第２のターミナル２３０と、プラズマ発生用配線４４のプラズマ発生用配線ターミナル部４４１に接続される第３のターミナル２４０と、によって構成され、全体が電磁シールドを兼ねたケース２４によって覆われている。 The plug cap 2 includes an electromagnetic noise reduction circuit unit 20 that is a main part of the present invention, an insulating resin mold 251 made of epoxy resin or the like covering the electromagnetic noise reduction circuit unit 20, and an insulator head 121 of the plasma ignition plug 10. Insulating seal portion 250 formed in a cylindrical shape by an elastic member to be fitted to the first electrode 210, first terminal 210 connected to center electrode terminal portion 111, and discharge wiring terminal portion 361 of discharge wiring 36 The second terminal 230 and the third terminal 240 connected to the plasma generation wiring terminal portion 441 of the plasma generation wiring 44 are entirely covered by a case 24 that also serves as an electromagnetic shield. .
なお、ケース２４は、全体を金属で形成しても良いし、樹脂で形成し、表面を金属メッキで覆って形成しても良い。ケース２４を金属で形成した場合には、ケース２４自身が電磁シールドとして機能し、樹脂で形成した場合には、金属メッキ部分が電磁シールドとして機能する。
加えて、一定形状のケース２４を用いることによってシールド容量の個体差を小さくすることができるので、多気筒エンジンに複数のプラズマ式点火プラグ１０を装着した場合でもシールド間に浮遊容量の差による電位差が発生することがなく、新たな電磁ノイズ発生原とならない。
The case 24 may be entirely formed of metal, or may be formed of resin, and the surface may be covered with metal plating. When the case 24 is made of metal, the case 24 itself functions as an electromagnetic shield. When the case 24 is formed of resin, the metal plating portion functions as an electromagnetic shield.
In addition, since the individual difference in the shield capacity can be reduced by using the case 24 having a fixed shape, even when a plurality of plasma ignition plugs 10 are mounted on the multi-cylinder engine, the potential difference due to the difference in the floating capacity between the shields. Does not occur and does not become a new source of electromagnetic noise.
電磁ノイズ低減回路部２０は、プラズマ発生用電源４からの電流の放電用電源３への流入を阻止する第１の整流素子２１と、放電用電源３からの電流のプラズマ発生用電源４への流入を阻止する第２の整流素子２２と、電磁ノイズ防止用コンデンサ２３とによって構成されている。 The electromagnetic noise reduction circuit unit 20 includes a first rectifier element 21 that prevents the current from the plasma generation power source 4 from flowing into the discharge power source 3, and the current from the discharge power source 3 to the plasma generation power source 4. A second rectifying element 22 for blocking inflow and an electromagnetic noise preventing capacitor 23 are included.
本実施形態においては、ケース２４はハウジング六角部１３３を介してエンジンブロック５１に接地されている。
更に、プラグキャップ２は、ゴムパッキング等の弾性部材６１を介して、プラグキャップ固定部材６０によってプラグホール５２内に挟持されている。
In the present embodiment, the case 24 is grounded to the engine block 51 via the housing hexagonal portion 133.
Further, the plug cap 2 is sandwiched in the plug hole 52 by the plug cap fixing member 60 through an elastic member 61 such as rubber packing.
電磁ノイズは、第２のターミナル２３０と中心電極１１１との配線長が長いほど大きくなる。従って、この距離は短いほど良く、プラグキャップ２内に電磁ノイズ低減回路部２０を載置することで、配線長を極めて短くすることができる。
プラグキャップ固定部材６０は金属でできており、エンジンブロック５１と電気的に接続している。
第２のターミナル２３０と中心電極１１１との配線長を短くし、発生する電磁ノイズの大きさを小さくすることに加えて、プラグホール５２内に電磁ノイズ発生源を収納することで、エンジンブロック５１がシールドとして機能し、電磁ノイズ発生源がケース２４とで二重にシールドされ、確実に電磁ノイズの漏れを防止できる。
The electromagnetic noise increases as the wiring length between the second terminal 230 and the center electrode 111 increases. Therefore, the shorter the distance, the better. By placing the electromagnetic noise reduction circuit unit 20 in the plug cap 2, the wiring length can be made extremely short.
The plug cap fixing member 60 is made of metal and is electrically connected to the engine block 51.
In addition to shortening the wiring length between the second terminal 230 and the center electrode 111 and reducing the magnitude of the generated electromagnetic noise, the electromagnetic noise generating source is accommodated in the plug hole 52, so that the engine block 51 Functions as a shield, and the electromagnetic noise generation source is double-shielded with the case 24, so that leakage of electromagnetic noise can be reliably prevented.
図２を参照して本発明の第１の実施形態における回路構成について詳述する。
放電用電源３は、第１のバッテリ３１、イグニッションキー３２、点火コイル３３、トランジスタからなるイグナイタ３４、電子制御装置３５によって構成されている。
バッテリ３１は、マイナス側が接地されている。イグニッションスイッチ３２が投入され、ＥＣＵ３５からの点火信号により、第１のバッテリ３１から低電圧の一次電圧が点火コイル３３の一次コイル３３１に印加され、イグナイタ３４のスイッチングによって一次電圧が遮断されると、点火コイル３３内の磁界が変化し、自己誘導作用により点火コイル３３の二次コイル３３２に−１０〜−３０ｋＶの負の二次電圧が誘起される。
プラズマ発生用電源４は、第２のバッテリ４１、抵抗体４２、プラズマ発生用コンデンサ４３によって構成されている。第２のバッテリ４１は、プラス側が接地されており、第２のバッテリ４１によりプラズマ発生用コンデンサ４３が充電される。
The circuit configuration in the first embodiment of the present invention will be described in detail with reference to FIG.
The discharge power source 3 includes a first battery 31, an ignition key 32, an ignition coil 33, an igniter 34 including a transistor, and an electronic control unit 35.
The battery 31 is grounded on the negative side. When the ignition switch 32 is turned on, a low voltage primary voltage is applied from the first battery 31 to the primary coil 331 of the ignition coil 33 by an ignition signal from the ECU 35, and when the primary voltage is cut off by switching of the igniter 34, The magnetic field in the ignition coil 33 changes, and a negative secondary voltage of −10 to −30 kV is induced in the secondary coil 332 of the ignition coil 33 by self-induction.
The plasma generating power source 4 includes a second battery 41, a resistor 42, and a plasma generating capacitor 43. The positive side of the second battery 41 is grounded, and the plasma generating capacitor 43 is charged by the second battery 41.
電磁ノイズ低減回路２０は、放電用配線３６と中心電極１１０との間で直列に設けられる第１の整流素子２２と、プラズマ発生用配線４４と上記中心電極１１０との間で直列に設けられる第２の整流素子２３と、プラズマ発生用電源４と第２の整流素子２２との間で上記第２の整流素子２２と並列に介装される電磁ノイズ防止用コンデンサ２３とを含んだ構成とする。
更に、第１の整流素子２１と第２の整流素子２２と電磁ノイズ防止用コンデンサ２３とをケース２４で覆い、電磁ノイズ防止用コンデンサ２３の接地側とケース２４とが接地電極１３１を介して接地する。
より好適には、放電用配線３６には高圧抵抗線が用いられ、第１の整流素子２１にはダイオードが用いられ、第２の整流素子２２には複数のダイオードを並列に接続した高圧ダイオードが用いられる。
The electromagnetic noise reduction circuit 20 includes a first rectifying element 22 provided in series between the discharge wiring 36 and the center electrode 110, and a first rectifier element 22 provided in series between the plasma generation wiring 44 and the center electrode 110. 2 rectifying elements 23, and an electromagnetic noise preventing capacitor 23 interposed between the plasma generating power source 4 and the second rectifying element 22 in parallel with the second rectifying element 22. .
Further, the first rectifying element 21, the second rectifying element 22 and the electromagnetic noise preventing capacitor 23 are covered with a case 24, and the ground side of the electromagnetic noise preventing capacitor 23 and the case 24 are grounded via the ground electrode 131. To do.
More preferably, a high-voltage resistance wire is used for the discharge wiring 36, a diode is used for the first rectifier element 21, and a high-voltage diode in which a plurality of diodes are connected in parallel is used for the second rectifier element 22. Used.
印加された上記二次電圧が中心電極１１０と接地電極１３１との放電電圧を超えると両電極間に放電が開始され、放電空間１４０内の気体が小領域でプラズマ状態となる。このプラズマ状態の気体は、導電性を有し、プラズマ発生用コンデンサ４３の両極間に蓄えられた電荷の放電を引き起こし、放電空間１４０内の気体の更なるプラズマ状態化を誘発、領域を拡大する。このプラズマ状態の気体は、高温・高圧となり、内燃機関の上記燃焼室５内へ噴射される。 When the applied secondary voltage exceeds the discharge voltage between the center electrode 110 and the ground electrode 131, discharge is started between the two electrodes, and the gas in the discharge space 140 becomes a plasma state in a small region. The gas in the plasma state has conductivity, causes discharge of electric charges stored between both electrodes of the plasma generating capacitor 43, induces further plasma state of the gas in the discharge space 140, and expands the region. . This plasma state gas becomes a high temperature and a high pressure, and is injected into the combustion chamber 5 of the internal combustion engine.
本発明の効果を確認するため比較例として、図３（ａ）、（ｂ）、（ｃ）に示す位置に電磁ノイズ低減用コンデンサ２３を配設した場合について各々検討を行った。
実施例１は、上記第１の実施形態として図１、図２に示した電磁ノイズ防止用コンデンサ２３を第２の整流素子２２とプラズマ発生用電源４との間で第２の整流阻止２２の極近傍に設けた場合のプラズマ式点火装置１についての試験結果を示す。
比較例１は、図３（ａ）に示すように、第１の整流素子２１と第２の整流素子２２との間で、プラズマ式点火プラグ１０よりも第２の整流素子２２側に電磁ノイズ低減用コンデンサ２３を配設した電磁ノイズ低減回路部２ａを用い、比較例２は、図３（ｂ）に示すように、第１の整流素子２１と第２の整流素子２２との間で、プラズマ式点火プラグ１０よりも第１の整流素子２１側に電磁ノイズ低減用コンデンサ２３を配設した電磁ノイズ低減回路２ｂを用い、比較例３は、図３（ｃ）に示すように第１の整流素子２１と第２の整流素子２２との間で、プラズマ式点火プラグ１０と同じ位置に電磁ノイズ低減用コンデンサ２３を配設した電磁ノイズ低減回路２ｃを用いた場合の試験結果を示す。
更に、本発明の第１の実施形態において、図５（ａ）に示すように電磁ノイズ低減用コンデンサ２３をプラズマ式点火プラグ１０よりも４０ｃｍ離して配置した場合の試験結果を比較例４として示し、図５（ｂ）に示すように、電磁ノイズ低減用コンデンサ２３とプラズマ式点火プラグ１０との距離を３０ｃｍ以内に配置した場合の試験結果を比較例５として示す。
In order to confirm the effect of the present invention, as a comparative example, the case where the electromagnetic noise reduction capacitor 23 is disposed at the position shown in FIGS. 3A, 3B, and 3C was examined.
In Example 1, as the first embodiment, the electromagnetic noise prevention capacitor 23 shown in FIGS. 1 and 2 is connected between the second rectifying element 22 and the plasma generating power source 4 by the second rectifying prevention 22. The test result about the plasma ignition device 1 when provided in the vicinity of the pole is shown.
In the first comparative example, as shown in FIG. 3A, the electromagnetic noise between the first rectifying element 21 and the second rectifying element 22 is closer to the second rectifying element 22 than the plasma spark plug 10. As shown in FIG. 3B, Comparative Example 2 uses the electromagnetic noise reduction circuit unit 2a in which the reduction capacitor 23 is disposed, and between the first rectifier element 21 and the second rectifier element 22, An electromagnetic noise reduction circuit 2b in which an electromagnetic noise reduction capacitor 23 is disposed closer to the first rectifying element 21 than the plasma spark plug 10 is used. In Comparative Example 3, the first example as shown in FIG. The test result when using the electromagnetic noise reduction circuit 2c in which the electromagnetic noise reduction capacitor 23 is disposed between the rectifying element 21 and the second rectifying element 22 at the same position as the plasma ignition plug 10 is shown.
Furthermore, in the first embodiment of the present invention, the test result when the electromagnetic noise reducing capacitor 23 is arranged 40 cm away from the plasma spark plug 10 as shown in FIG. As shown in FIG. 5B, the test result when the distance between the electromagnetic noise reduction capacitor 23 and the plasma ignition plug 10 is arranged within 30 cm is shown as Comparative Example 5.
表１に示すように、比較例１〜３のいずれの場合も、放電用配線３６からの放電電位が低下し、内燃機関の失火が起こった。
比較例１〜３の場合には、電磁ノイズ低減用コンデンサ２３により、電磁ノイズの低減のみならず放電電流がバイパスされてしまうものと考えられる。
本発明の第１の実施形態である実施例１の場合は、内燃機関の失火が起こらず、電磁ノイズの発生も見られなかった。
本発明の第１の実施形態においては、電磁ノイズ防止用コンデンサ２３による放電電圧の減衰を伴うことなく、点火コイル３３から二次電圧が加わり放電を開始する時に発生する高周波のイズ電流のみをバイパスして電磁ノイズの発生を防止できると考えられる。
As shown in Table 1, in any of Comparative Examples 1 to 3, the discharge potential from the discharge wiring 36 was lowered, and misfire of the internal combustion engine occurred.
In the case of Comparative Examples 1 to 3, it is considered that the electromagnetic noise reduction capacitor 23 bypasses the discharge current as well as the electromagnetic noise.
In the case of Example 1 which is the first embodiment of the present invention, the misfire of the internal combustion engine did not occur, and the generation of electromagnetic noise was not observed.
In the first embodiment of the present invention, only the high-frequency noise current generated when the secondary voltage is applied from the ignition coil 33 to start the discharge is bypassed without the attenuation of the discharge voltage by the electromagnetic noise prevention capacitor 23. Thus, it is considered that the generation of electromagnetic noise can be prevented.
ところが、本発明の第１の実施形態と回路的には同一構成であっても、比較例４の場合には、内燃機関の誤動作が起こり、比較例５の場合は、正常な動作であった。
このことから、電磁ノイズ防止用コンデンサ２３の載置位置を、プラズマ式点火プラグ１０との特定の距離内（比較例５においては３０ｃｍ以内）に載置することが極めて重要であるとの知見を得た。
However, even though the circuit configuration is the same as that of the first embodiment of the present invention, the malfunction of the internal combustion engine occurs in the case of the comparative example 4, and the normal operation is performed in the case of the comparative example 5. .
From this, it is found that it is extremely important to place the mounting position of the electromagnetic noise prevention capacitor 23 within a specific distance from the plasma ignition plug 10 (within 30 cm in the comparative example 5). Obtained.
図５に本発明の第２の実施形態を示す。なお、本発明の第１の実施形態と共通する部分につては図中に同じ符号を記したので、説明を省略する。（以下に示す他の実施形態においても同様である。）
本実施形態においては、第２のターミナル部２３０ｄとプラズマ発生用配線接続ターミナル２４０ｄとを互いに直交するような位置に配設してプラグキャップ２ｄの更なる小型化を図っている。
また、本実施形態においては、プラズマ式点火ノズル１０をエンジンブロック５１に螺結した後、プラグキャップ２ｄを差し込むだけで中心電極ターミナル部１１１が第１のターミナル部２１０に嵌着され、更に、絶縁碍子頭部１２１が絶縁部材２５０によって嵌着され、加えて、ハウジング六角部１３３とケース２４とが接地状態となるので、組み付けが極めて容易である。
FIG. 5 shows a second embodiment of the present invention. In addition, since the same code | symbol was described in the figure about the part which is common in the 1st Embodiment of this invention, description is abbreviate | omitted. (The same applies to other embodiments described below.)
In the present embodiment, the plug terminal 2d is further reduced in size by arranging the second terminal portion 230d and the plasma generation wiring connection terminal 240d at positions orthogonal to each other.
Further, in the present embodiment, after the plasma ignition nozzle 10 is screwed to the engine block 51, the center electrode terminal portion 111 is fitted to the first terminal portion 210 simply by inserting the plug cap 2d, and further the insulation is performed. Since the insulator head part 121 is fitted by the insulating member 250 and the housing hexagonal part 133 and the case 24 are in a grounded state, the assembly is extremely easy.
更に、電磁ノイズ低減回路部２０ｄを例えばアルミナや窒化アルミニウム等の放熱性の良い絶縁基板上に形成することにより、第１の整流素子２１、第２の整流素子２２、電磁ノイズ低減用コンデンサ２３の放熱性を良好にし、信頼性の向上を図ることも可能となる。
また、電磁ノイズ低減用コンデンサ２３と第３のターミナル部２４０の間に電磁ノイズが乗らないように注意する必要がある。
そこで、本実施形態では、電磁ノイズが発生する第１の整流素子２１とその配線から、電磁ノイズ低減用コンデンサ２３を離し、第２のターミナル部２３０ｄと第３のターミナル部２４０ｄとを離した構造としてある。
電磁ノイズ低減用コンデンサ２３を第３のターミナル２４０ｄの近傍に設けることにより、更に電磁ノイズの発生が低減できるとの知見を得た。
加えて、第２のターミナル２３０ｄと電磁ノイズ低減用コンデンサ２３との距離を離すことにより、第２のターミナル２３０ｄに印加される高圧の放電用電圧が電磁ノイズ低減用コンデンサ２３にリークするのを防止できる。
Further, by forming the electromagnetic noise reduction circuit portion 20d on an insulating substrate with good heat dissipation, such as alumina or aluminum nitride, the first rectifying element 21, the second rectifying element 22, and the electromagnetic noise reducing capacitor 23 are provided. It is also possible to improve heat dissipation and improve reliability.
In addition, it is necessary to be careful not to get electromagnetic noise between the electromagnetic noise reducing capacitor 23 and the third terminal unit 240.
Therefore, in the present embodiment, a structure in which the electromagnetic noise reducing capacitor 23 is separated from the first rectifying element 21 and the wiring thereof in which electromagnetic noise is generated, and the second terminal portion 230d and the third terminal portion 240d are separated. It is as.
It has been found that the generation of electromagnetic noise can be further reduced by providing the electromagnetic noise reducing capacitor 23 in the vicinity of the third terminal 240d.
In addition, the high-voltage discharge voltage applied to the second terminal 230d is prevented from leaking to the electromagnetic noise reduction capacitor 23 by increasing the distance between the second terminal 230d and the electromagnetic noise reduction capacitor 23. it can.
図６に、本発明の第３の実施形態を示す。
本実施形態においては、基本構造は第２の実施形態と同様であるが、電磁シールドとしてのケース２４ｅをエンジンブロック５１の上部に設けた固定部５１０に弾性部材６１を介して固着する構造とした点が相違する。
本実施形態においては、エンジンブロック５１が電磁シールドの機能を持ち、プラグホール５２内に閉じこめられた部分の電磁シールドを省略することができる。
このような構造にすることによって、プラグホール５２から露出下部分のみをケース２４ｅによって覆うだけで電磁ノイズの漏れを防止できる。
FIG. 6 shows a third embodiment of the present invention.
In this embodiment, the basic structure is the same as that of the second embodiment, but the case 24e as an electromagnetic shield is fixed to the fixing portion 510 provided on the upper part of the engine block 51 via the elastic member 61. The point is different.
In the present embodiment, the engine block 51 has a function of electromagnetic shielding, and the electromagnetic shielding of the portion confined in the plug hole 52 can be omitted.
With such a structure, leakage of electromagnetic noise can be prevented only by covering only the lower exposed portion of the plug hole 52 with the case 24e.
図７に、本発明の第４の実施形態を示す。
本実施形態においては、基本構造は第３の実施形態とほぼ同様であるが、第１の整流素子２１と第２の整流素子２２とをプラグホール５２内に位置するよう載置し、電磁ノイズ低減用コンデンサとして、プラズマ発生用電源回路４に含まれるプラズマ発生用コンデンサ４３ｆの一部または全部を第３のターミナル２４０の近傍に載置した点において相違する。
上述した本発明の第１〜第３の実施例においては、電磁ノイズ低減用コンデンサ２３として０．１〜１μＦの小さな容量のコンデンサを用いたが、本実施形態において、プラズマ発生用コンデンサ４３ｆとして２μＦのコンデンサを載置した。
この様な構造とすることで、プラズマ発生用コンデンサ４３ｆが大電流供給用の電源としての機能と電磁ノイズ低減用コンデンサとしての機能を兼用することができるのでよりプラズマ式点火装置の搭載性が向上する上に、エンジンブロック５１による電磁シールド効果が最大限に発揮され、更に電磁ノイズの漏れを防止できるとの知見を得た。
また、ケース２４ｆの形状を簡易な形状にすることができるので、製造が容易で実用性が極めて高い。
FIG. 7 shows a fourth embodiment of the present invention.
In this embodiment, the basic structure is substantially the same as that of the third embodiment, but the first rectifying element 21 and the second rectifying element 22 are placed so as to be positioned in the plug hole 52, and electromagnetic noise The difference is that a part or all of the plasma generating capacitor 43f included in the plasma generating power supply circuit 4 is placed in the vicinity of the third terminal 240 as a reducing capacitor.
In the first to third embodiments of the present invention described above, a capacitor having a small capacitance of 0.1 to 1 μF is used as the electromagnetic noise reducing capacitor 23. In this embodiment, 2 μF is used as the plasma generating capacitor 43f. The capacitor was mounted.
By adopting such a structure, the plasma generating capacitor 43f can function both as a power source for supplying a large current and as a capacitor for reducing electromagnetic noise, so that the mounting capability of the plasma ignition device is improved. In addition, the inventors have obtained knowledge that the electromagnetic shielding effect of the engine block 51 is maximized and leakage of electromagnetic noise can be prevented.
In addition, since the shape of the case 24f can be made simple, it is easy to manufacture and is extremely practical.
図８に、本発明の第５の実施形態を示す。上記実施形態においては、放電用回路３は第１のバッテリ３１を電源とし、プラズマ発生用回路４は第２のバッテリ４１を電源とする２電源を具備した構成について説明したが、図８に示すように、バッテリ３００のプラス側を接地し、マイナス側を放電用電源回路３ｈとプラズマ用電源回路４とに接続して、一つのバッテリ３００を放電用電源回路３とプラズマ用電源回路４とで共有する構成にすることも可能である。この際、点火プラグ３３ｇとイグナイタ３４ｇとの極性に留意しなければならない。本実施形態においても、上記実施形態と同様に電磁ノイズの低減を図ることが可能となる。 FIG. 8 shows a fifth embodiment of the present invention. In the above embodiment, the discharge circuit 3 has the first battery 31 as the power source, and the plasma generation circuit 4 has the two power sources that use the second battery 41 as the power source. Thus, the positive side of the battery 300 is grounded, the negative side is connected to the discharge power supply circuit 3 h and the plasma power supply circuit 4, and one battery 300 is connected to the discharge power supply circuit 3 and the plasma power supply circuit 4. A shared configuration is also possible. At this time, attention must be paid to the polarities of the spark plug 33g and the igniter 34g. Also in this embodiment, it is possible to reduce electromagnetic noise as in the above embodiment.
図９に本発明の第６の実施形態を示す。図９に示すように、多数の燃焼室を有する多気筒エンジンの場合に、複数のプラズマ式点火装置１０をディストリビュータ６等によって制御する構成としても、本発明の第１の実施形態と同様の効果が得られる。この場合複数のプラズマ発生用配線を一括してシールドすることにより更に電磁ノイズの低減を図ることも可能となる。 FIG. 9 shows a sixth embodiment of the present invention. As shown in FIG. 9, in the case of a multi-cylinder engine having a large number of combustion chambers, the same effects as those of the first embodiment of the present invention can be obtained even when the plurality of plasma ignition devices 10 are controlled by the distributor 6 or the like. Is obtained. In this case, electromagnetic noise can be further reduced by collectively shielding a plurality of wirings for plasma generation.
当然のことながら、本発明は上記実施形態に限定するものではなく、本発明の趣旨を逸脱しない範囲で適宜変更可能である。
例えば、上記実施形態の説明において上記放電用電源と上記プラズマ発生用電源を離れた状態で配設した場合について説明したが、当然のことながら、上記放電用電源と上記プラズマ発生用電源とを一体的に配設しても良い。
また、Ｄｃ-Ｄｃコンバータ等により第１のバッテリ３１と第２のバッテリ４１との電源電圧を適宜調整することも可能である。
As a matter of course, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist of the present invention.
For example, in the description of the above embodiment, the case where the discharge power source and the plasma generation power source are disposed apart from each other has been described, but it is natural that the discharge power source and the plasma generation power source are integrated. You may arrange | position.
It is also possible to adjust the power supply voltage of the first battery 31 and the second battery 41 as appropriate using a Dc-Dc converter or the like.
１ プラズマ式点火装置
１０ プラズマ式点火プラグ
１１０ 中心電極
１２０ 絶縁碍子
１３１ 接地電極
１４０ 放電空間
２ プラグキャップ
２０ 電磁ノイズ低減回路部
２１ 第１の整流素子
２２ 第２の整流素子
２３ 電磁ノイズ防止用コンデンサ
２４ ケース（電磁シールド）
２１０ 第１のターミナル
２３０ 第２のターミナル
２４０ 第３のターミナル
３ 放電用電源回路
３１、４１ バッテリ
３３ 点火コイル
３４ イグナイタ（トランジスタ）
３５ 電子制御装置（ＥＣＵ）
３６ 放電用配線
４ プラズマ発生用電源回路
４４ プラズマ発生用配線
４３ プラズマ発生用コンデンサ
DESCRIPTION OF SYMBOLS 1 Plasma type ignition device 10 Plasma type spark plug 110 Center electrode 120 Insulator 131 Ground electrode 140 Discharge space 2 Plug cap 20 Electromagnetic noise reduction circuit part 21 1st rectifier 22 Second rectifier 23 Electromagnetic noise prevention capacitor 24 Case (electromagnetic shield)
210 First terminal 230 Second terminal 240 Third terminal 3 Power supply circuits 31 and 41 for discharge Battery 33 Ignition coil 34 Igniter (transistor)
35 Electronic Control Unit (ECU)
36 Discharge wiring 4 Plasma generating power supply circuit 44 Plasma generating wiring 43 Plasma generating capacitor
Claims (10)
上記放電用配線上に設けられ上記プラズマ発生用電源回路からの電流の上記放電用電源回路への流入を阻止する第１の整流素子と、
上記プラズマ発生用配線上に設けられ上記放電用電源回路からの電流の上記プラズマ発生用電源回路への流入を阻止する第２の整流素子と、
上記プラズマ発生用電源回路と上記第２の整流素子との間に上記第２の整流素子と並列に介装される電磁ノイズ防止用コンデンサとを含んで電磁ノイズ低減回路部を構成し、
上記電磁ノイズ低減回路部を上記中心電極の可及的近傍に設けることを特徴とするプラズマ式点火装置。 A discharge power supply circuit comprising: at least one battery; an ignition coil that boosts the primary voltage of the battery to a high secondary voltage; and an igniter that is controlled by an electronic control unit to control the operation of the ignition coil. A plasma generation power supply circuit comprising a plasma generation capacitor charged by the battery; and application of a high voltage from the discharge power supply circuit and power supply from the plasma generation power supply circuit mounted on the internal combustion engine. A plasma ignition plug for injecting and igniting a gas in a cylindrical discharge space formed by a center electrode, an insulator and a ground electrode into a combustion chamber of an internal combustion engine in a high-temperature and high-pressure plasma state; Discharge wiring that connects the power supply circuit for power supply and the center electrode, and wiring for plasma generation that connects the power supply circuit for plasma generation and the center electrode A constructed plasma ignition system by,
A first rectifying element that is provided on the discharge wiring and prevents the current from the plasma generation power supply circuit from flowing into the discharge power supply circuit;
A second rectifying element that is provided on the plasma generation wiring and prevents the current from the discharge power supply circuit from flowing into the plasma generation power supply circuit;
An electromagnetic noise reduction circuit unit including an electromagnetic noise prevention capacitor interposed in parallel with the second rectifying element between the plasma generating power supply circuit and the second rectifying element;
A plasma ignition device characterized in that the electromagnetic noise reduction circuit section is provided as close as possible to the center electrode.
上記放電用配線上に設けられ上記プラズマ発生用電源回路からの電流の上記放電用電源回路への流入を阻止する第１の整流素子と、
上記プラズマ発生用配線上に設けられ上記放電用電源回路からの電流の上記プラズマ発生用電源回路への流入を阻止する第２の整流素子と、
上記プラズマ発生用電源回路と上記第２の整流素子との間に上記第２の整流素子と並列に介装される上記プラズマ発生用コンデンサの一部または全部とを含んで電磁ノイズ低減回路部を構成し、
上記電磁ノイズ低減回路部を上記中心電極の可及的近傍に設けることを特徴とするプラズマ式点火装置。 A discharge power supply circuit comprising: at least one battery; an ignition coil that boosts the primary voltage of the battery to a high secondary voltage; and an igniter that is controlled by an electronic control unit to control the operation of the ignition coil. A plasma generation power supply circuit comprising a plasma generation capacitor charged by the battery; and application of a high voltage from the discharge power supply circuit and power supply from the plasma generation power supply circuit mounted on the internal combustion engine. A plasma ignition plug for injecting and igniting a gas in a cylindrical discharge space formed by a center electrode, an insulator and a ground electrode into a combustion chamber of an internal combustion engine in a high-temperature and high-pressure plasma state; Discharge wiring that connects the power supply circuit for power supply and the center electrode, and wiring for plasma generation that connects the power supply circuit for plasma generation and the center electrode A constructed plasma ignition system by,
A first rectifying element that is provided on the discharge wiring and prevents the current from the plasma generation power supply circuit from flowing into the discharge power supply circuit;
A second rectifying element that is provided on the plasma generation wiring and prevents the current from the discharge power supply circuit from flowing into the plasma generation power supply circuit;
An electromagnetic noise reduction circuit unit including a part or all of the plasma generating capacitor interposed in parallel with the second rectifying element between the plasma generating power supply circuit and the second rectifying element; Configure
A plasma ignition device characterized in that the electromagnetic noise reduction circuit section is provided as close as possible to the center electrode.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007156178A JP4967835B2 (en) | 2006-12-20 | 2007-06-13 | Plasma ignition device |
| US11/896,534 US7387115B1 (en) | 2006-12-20 | 2007-09-04 | Plasma ignition system |
| DE102007000754A DE102007000754B4 (en) | 2006-12-20 | 2007-09-20 | plasma ignition |
| FR0758135A FR2910730B1 (en) | 2006-12-20 | 2007-10-08 | PLASMA IGNITION SYSTEM |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006342390 | 2006-12-20 | ||
| JP2006342390 | 2006-12-20 | ||
| JP2007156178A JP4967835B2 (en) | 2006-12-20 | 2007-06-13 | Plasma ignition device |
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| Publication Number | Publication Date |
|---|---|
| JP2008175197A true JP2008175197A (en) | 2008-07-31 |
| JP4967835B2 JP4967835B2 (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007156178A Expired - Fee Related JP4967835B2 (en) | 2006-12-20 | 2007-06-13 | Plasma ignition device |
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| JP (1) | JP4967835B2 (en) |
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| WO2010095694A1 (en) * | 2009-02-18 | 2010-08-26 | 日本特殊陶業株式会社 | Ignition device for plasma jet ignition plug |
| JP2010216467A (en) * | 2009-02-19 | 2010-09-30 | Denso Corp | Plasma ignition device |
| JP2011069272A (en) * | 2009-09-25 | 2011-04-07 | Ngk Insulators Ltd | Ignition device of internal combustion engine |
| WO2012005201A1 (en) * | 2010-07-07 | 2012-01-12 | イマジニアリング株式会社 | Plasma-generating apparatus |
| WO2012066708A1 (en) * | 2010-11-16 | 2012-05-24 | 日本特殊陶業株式会社 | Plasma ignition device and plasma ignition method |
| WO2012073564A1 (en) * | 2010-11-29 | 2012-06-07 | 日本特殊陶業株式会社 | Ignition device and structure for mounting same |
| JP2012159038A (en) * | 2011-02-01 | 2012-08-23 | Imagineering Inc | Shield structure of electromagnetic wave |
| JP2018159331A (en) * | 2017-03-23 | 2018-10-11 | 三菱電機株式会社 | High-frequency discharge ignition device |
| WO2020021105A1 (en) * | 2018-07-27 | 2020-01-30 | Rosenberger Hochfrequenztechnik Gmbh & Co. Kg | Apparatus for igniting a fuel mixture, transmission element for transmitting a high-voltage ignition voltage, ignition device, and circuit device |
| JP2020204319A (en) * | 2020-03-31 | 2020-12-24 | 加藤 克己 | Power supply |
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| US8528531B2 (en) | 2009-02-18 | 2013-09-10 | Ngk Spark Plug Co., Ltd. | Ignition apparatus of plasma jet ignition plug |
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| JP2012159038A (en) * | 2011-02-01 | 2012-08-23 | Imagineering Inc | Shield structure of electromagnetic wave |
| JP2018159331A (en) * | 2017-03-23 | 2018-10-11 | 三菱電機株式会社 | High-frequency discharge ignition device |
| US10320159B2 (en) | 2017-03-23 | 2019-06-11 | Mitsubishi Electric Corporation | High frequency discharge ignition device |
| WO2020021105A1 (en) * | 2018-07-27 | 2020-01-30 | Rosenberger Hochfrequenztechnik Gmbh & Co. Kg | Apparatus for igniting a fuel mixture, transmission element for transmitting a high-voltage ignition voltage, ignition device, and circuit device |
| US11588303B2 (en) | 2018-07-27 | 2023-02-21 | Rosenberger Hochfrequenztechnik Gmbh & Co. Kg | Apparatus for igniting a fuel mixture, transmission element for transmitting a high-voltage ignition voltage, ignition device, and circuit device |
| JP2020204319A (en) * | 2020-03-31 | 2020-12-24 | 加藤 克己 | Power supply |
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