JP6517088B2 - Ignition device for internal combustion engine - Google Patents

Ignition device for internal combustion engine Download PDF

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JP6517088B2
JP6517088B2 JP2015117895A JP2015117895A JP6517088B2 JP 6517088 B2 JP6517088 B2 JP 6517088B2 JP 2015117895 A JP2015117895 A JP 2015117895A JP 2015117895 A JP2015117895 A JP 2015117895A JP 6517088 B2 JP6517088 B2 JP 6517088B2
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島田　直樹
直樹 島田
崇明 柳井
崇明 柳井
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Hitachi Astemo Hanshin Ltd
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Description

本発明は、自動車両に搭載される内燃機関用点火装置に関する。   The present invention relates to an ignition device for an internal combustion engine mounted on a motor vehicle.

車両搭載の内燃機関用点火装置は、古典的な電流遮断原理により点火コイルの二次側に高電圧を発生させて点火プラグに放電を生じさせるものである。その概略構成を図５に示す。内燃機関用点火装置１０１は、点火コイル１０２の一次側（一次コイル１０２ａの高圧側）に車載バッテリー等の直流電源が供給され、二次側（二次コイル１０２ｂ）に点火プラグ１０３が接続され、エンジン（内燃機関）の動作を統括的に制御する内燃機関制御装置（ＥＣＵ）等から供給される点火信号によってスイッチング素子１０４のＯＮ・ＯＦＦを制御することで、一次コイル１０２ａへの通電・遮断が適宜な燃焼タイミングで制御され、一次電流遮断時に発生する高電圧によって点火プラグ１０３の放電が行われる（図６を参照）。   The internal combustion engine ignition device mounted on a vehicle generates high voltage on the secondary side of the ignition coil according to the classical current interruption principle to cause discharge in the ignition plug. The schematic configuration is shown in FIG. In the internal combustion engine ignition device 101, a DC power source such as an on-vehicle battery is supplied to the primary side (high voltage side of the primary coil 102a) of the ignition coil 102, and the spark plug 103 is connected to the secondary side (secondary coil 102b). By controlling ON / OFF of the switching element 104 by an ignition signal supplied from an internal combustion engine control unit (ECU) or the like that controls the operation of the engine (internal combustion engine) in an integrated manner, energization / shutoff of the primary coil 102a is realized. The ignition plug 103 is discharged by a high voltage generated at the time of interruption of the primary current, which is controlled at an appropriate combustion timing (see FIG. 6).

また、一次電流の通電時（スイッチング素子１０４がＯＦＦからＯＮに変わった時）には、一次電流遮断時（スイッチング素子１０４がＯＮからＯＦＦに変わった時）とは逆極性の電圧が二次側に発生するので、この点火プラグ１０３の放電時とは逆極性の電圧（以下、ＯＮ電圧という）によって点火プラグ１０３に放電が生じることが無いよう、点火プラグ１０３の放電経路の適所（例えば、二次コイル１０２ｂの点火プラグ非接続側と一次コイル１０２ａの高圧側との間）に、ＯＮ電圧防止用ダイオード２０１ｃが設けられている。   In addition, when the primary current flows (when the switching element 104 changes from OFF to ON), the voltage of the opposite polarity to that when the primary current is interrupted (when the switching element 104 changes from ON to OFF) is the secondary side Therefore, the discharge path of the spark plug 103 can be properly positioned (for example, two) so that the spark plug 103 is not discharged by a voltage (hereinafter referred to as ON voltage) having the opposite polarity to that of the spark plug 103. An ON voltage preventing diode 201c is provided between the spark plug non-connecting side of the next coil 102b and the high voltage side of the primary coil 102a).

このＯＮ電圧は、点火コイルの巻数比により定まる誘導成分に応じた電圧（図６中、Ｖ１で示す）であるが、通電開始直後にはパルス状の振動電圧が生じている。これは、スイッチング素子１０４のＯＮ時に、一次コイル１０２ａの持つ容量成分への突入電流によって電流値が急激に変化し、点火コイル１０２の二次側に発生するパルス状の高電圧が誘導成分と容量成分による共振を起こすためである。例えば、誘導成分によるＯＮ電圧Ｖ１が５００Ｖ程度であっても、通電開始直後の振動電圧が重畳された電圧Ｖ２は１０００Ｖを超える場合もある。   This ON voltage is a voltage (indicated by V1 in FIG. 6) corresponding to the induction component determined by the turn ratio of the ignition coil, but a pulse-like oscillating voltage is generated immediately after the start of energization. This is because when the switching element 104 is turned on, the rush current to the capacitive component of the primary coil 102a causes a sudden change in the current value, and the pulsed high voltage generated on the secondary side of the ignition coil 102 is the inductive component and the capacitance This is to cause resonance due to the component. For example, even if the ON voltage V1 due to the induction component is about 500 V, the voltage V2 on which the oscillating voltage immediately after the start of energization is superimposed may exceed 1000 V.

このように、スイッチング素子１０４のＯＮ時には、点火コイル１０２の誘導成分に応じた本来のＯＮ電圧に振動電圧が重畳されるため、ＯＮ電圧防止用ダイオード２０１ｃの逆方向には、ＯＮ電圧Ｖ１よりも遙かに高い電圧Ｖ２が印加されることとなる。定格上の耐電圧がＶ２以上のＯＮ電圧防止用ダイオード２０１ｃであれば、ＯＮ電圧による点火プラグ１０３の放電を防げるはずであるが、通電開始直後に生ずるパルス状の高電圧は立ち上がりが早く、ＯＮ電圧防止用ダイオード２０１ｃで抑制できない場合もあるため、振動電圧に起因した点火プラグ１０３の異常放電が生ずる危険性がある。このように、正規の点火時期（点火信号のＯＦＦタイミング）以前に点火プラグが放電してしまい、混合ガスに着火すると、内燃機関の出力減、あるいはエンジン回転の不調をもたらす可能性があり、最悪の場合は内燃機関が損傷してしまう。   As described above, when the switching element 104 is ON, the oscillating voltage is superimposed on the original ON voltage according to the induction component of the ignition coil 102. Therefore, in the reverse direction of the ON voltage preventing diode 201c, the ON voltage V1 is higher than the ON voltage V1. A much higher voltage V2 will be applied. If the rated voltage withstanding voltage is V2 or more, the ON voltage prevention diode 201c should prevent the discharge of the spark plug 103 due to the ON voltage, but the pulsed high voltage generated immediately after the start of energization starts quickly. Since the voltage can not be suppressed by the voltage preventing diode 201c, there is a risk that abnormal discharge of the spark plug 103 may occur due to the oscillating voltage. Thus, if the spark plug is discharged before the regular ignition timing (ignition signal OFF timing) and the mixed gas is ignited, the output of the internal combustion engine may decrease or the engine rotation may malfunction, which is the worst. In this case, the internal combustion engine is damaged.

上述したような一次コイルへの通電開始直後に生ずるパルス状のＯＮ電圧による点火プラグ１０３の異常放電を防止するために、一次コイルへの通電・遮断を制御するＩＧＢＴのゲートに印加するゲート電圧を微調整して、一次コイルに流れる一次電流が徐々に大きくなるようにすることで、一次コイルへの通電開始直後に、二次側に発生する振動電圧を抑制するようにした点火装置が提案されている（例えば、特許文献１を参照）。   In order to prevent the abnormal discharge of the spark plug 103 due to the pulse-like ON voltage generated immediately after the start of energization to the primary coil as described above, the gate voltage applied to the gate of the IGBT that controls energization / shutdown to the primary coil An ignition device has been proposed in which the oscillating voltage generated on the secondary side is suppressed immediately after the start of energization to the primary coil by finely adjusting the primary current flowing in the primary coil to gradually increase. (See, for example, Patent Document 1).

特開２００８−２９１７２８号公報JP, 2008-291728, A

しかしながら、特許文献１に記載されたような点火装置においては、定電流源とＮＰＮトランジスタを用いて、線形領域の狭いＩＧＢＴに印加するゲート電圧を高精度に調整する必要があることから、ＩＧＢＴのゲート電圧制御によって一次コイルの微小電流を制御できる十分な精度を持つ回路を実現するためには、複雑な回路構成が必要となる上に、ディスクリート部品のちょっとした器差が要求性能を満たさなくなる可能性があることから、製造上の歩留まりが悪く、高コストになると考えられる。   However, in the ignition device as described in Patent Document 1, it is necessary to precisely adjust the gate voltage applied to the narrow IGBT in the linear region by using a constant current source and an NPN transistor. In order to realize a circuit with sufficient accuracy that can control the minute current of the primary coil by gate voltage control, a complicated circuit configuration is required, and a slight difference between discrete components may not meet the required performance. It is considered that the manufacturing yield is low and the cost is high.

しかも、特許文献１に記載された点火装置では、ディスクリート部品等の経年劣化による特性変化で、一次コイルへの微小電流制御が正常に行われなくなる危険性もあり、点火装置としての動作信頼性も高いとは言えない。   Moreover, in the igniter described in Patent Document 1, there is a risk that the minute current control to the primary coil can not be normally performed due to the characteristic change due to the aged deterioration of the discrete parts etc., and the operation reliability as the igniter is also It can not be said that it is expensive.

そこで、本発明は、ＯＮ電圧防止用ダイオードによる異常放電防止機能を高い信頼性で実現できると共に、比較的単純な構成でコストも抑えられる内燃機関用点火装置の提供を目的とする。   SUMMARY OF THE INVENTION It is an object of the present invention to provide an ignition device for an internal combustion engine which can realize an abnormal discharge prevention function by an ON voltage prevention diode with high reliability and can suppress the cost with a relatively simple configuration.

上記課題を解決するために、請求項１に係る発明は、気筒毎に設けられる１つの点火プラグと、一次電流が流れる一次コイルと、該一次コイルと磁気的に結合しており、一次電流の遮断時に高電圧が発生して、前記点火プラグに二次電流を流す二次コイルと、を備える点火コイルと、前記点火プラグの放電経路に設けられ、前記点火コイルの一次電流遮断時に二次側に発生する電圧とは逆極性のＯＮ電圧を防止するＯＮ電圧防止用ダイオードと、前記点火コイルの一次コイルに流れる一次電流の通電・遮断を、メイン点火信号のＯＮ・ＯＦＦタイミングに基づいて切り替えるメインスイッチング素子と、前記メイン点火信号のＯＮタイミングに基づいてメインスイッチング素子がメイン一次電流の通電を開始する前に、二次側にパルス電圧を発生させない程度のサブ一次電流を、一次コイルからメインスイッチング素子を経ないバイパス通電路に流すことで、一次コイルの浮遊容量成分に充電を行うＯＮ電圧抑制手段と、を設け、前記ＯＮ電圧抑制手段は、前記バイパス通電路に設けられ、入力されるサブ点火信号に応じてサブ一次電流の流量を制御するサブスイッチング素子と、内燃機関制御装置より供給される点火信号を受け、少なくとも点火信号のＯＮタイミングから予め定めたメイン点火遅延時間が経過するまで、二次側にパルス電圧を発生させない程度のサブ一次電流をバイパス通電路に流し、点火信号のＯＦＦタイミングでサブ一次電流を遮断するサブ点火信号を生成し、前記サブスイッチング素子へ供給するサブ点火信号生成手段と、前記内燃機関制御装置からの点火信号を受け、該点火信号のＯＮタイミングをメイン点火遅延時間だけ遅らせたメイン点火信号を生成し、前記メインスイッチング素子へ供給するメイン点火信号生成手段と、で構成し、前記サブ点火信号生成手段は、サブ一次電流を徐々に増加させるようなサブ点火信号を生成することで、コイルの二次側に急峻な高電圧が生じないソフトＯＮ制御を行うようにしたことを特徴とする。 In order to solve the above problems, the invention according to claim 1 is magnetically coupled to one spark plug provided for each cylinder, a primary coil through which a primary current flows, and the primary coil, and An ignition coil comprising: a secondary coil generating a high voltage at the time of shutoff and passing a secondary current to the spark plug; and a discharge path of the spark plug provided on the discharge path, the secondary side at the time of interruption of the primary current of the ignition coil The ON voltage prevention diode that prevents the ON voltage of the reverse polarity to the voltage generated in the main coil, and the main switch switching on / off of the primary current flowing to the primary coil of the ignition coil based on the ON / OFF timing of the main ignition signal A pulse voltage is applied to the secondary side before the main switching element starts to energize the main primary current based on the switching element and the ON timing of the main ignition signal. Was not much of sub-primary current generated, by flowing from the primary coil to the bypass current path is not through the main switching element, and the ON voltage suppression means for charging the stray capacitance component of the primary coil, the provided, the ON voltage suppressing means A sub switching element provided in the bypass current path and controlling a flow rate of a sub primary current according to an input sub ignition signal, and an ignition signal supplied from the internal combustion engine control device; A sub-ignition signal that causes a sub-primary current not to generate a pulse voltage on the secondary side to the bypass conduction path until a predetermined main ignition delay time has elapsed from the timing, and cuts off the sub-primary current at the OFF timing of the ignition signal. Means for generating an ignition signal and supplying the same to the switching element, and a point from the internal combustion engine control device Main ignition signal generating means for receiving a signal, delaying the ON timing of the ignition signal by the main ignition delay time, and supplying the main ignition signal to the main switching element, and the sub ignition signal generating means By generating a sub ignition signal that gradually increases the sub primary current, it is characterized in that soft ON control is performed in which a steep high voltage is not generated on the secondary side of the coil .

本発明に係る内燃機関用点火装置によれば、メインスイッチング素子がＯＮになるタイミングよりも早く、ＯＮ電圧抑制手段によって、一次コイルの浮遊容量成分に対して突入電流を抑えながら充電できるので、メインスイッチング素子がＯＮになってメイン一次電流が流れる始めるときに、一次コイルの浮遊容量成分への突入電流によって二次側に立ち上がりの早いパルス状の高電圧が発生することを抑制し、点火プラグが所定の燃焼タイミングよりも前に放電するような異常燃焼をＯＮ電圧防止用ダイオードによって確実に阻止できる。また、ＯＮ電圧抑制手段は、比較的廉価に構成できると共に、動作信頼性の高いものとなる。   According to the igniter for an internal combustion engine according to the present invention, the ON voltage suppressing means can charge the stray capacitance component of the primary coil while suppressing the rush current earlier than the timing when the main switching element is turned ON. When the switching element turns on and the main primary current starts to flow, the rush current to the stray capacitance component of the primary coil suppresses the generation of a pulse-like high voltage that rises quickly on the secondary side, and the spark plug The abnormal combustion which discharges before the predetermined combustion timing can be reliably prevented by the ON voltage preventing diode. Also, the ON voltage suppression means can be configured relatively inexpensively, and has high operation reliability.

本発明に係る内燃機関用点火装置の第１実施形態を示す概略構成図である。It is a schematic block diagram which shows 1st Embodiment of the internal combustion engine ignition device which concerns on this invention. 電流制限手段の構成説明図である。It is structure explanatory drawing of a current limiting means. 第１実施形態に係る内燃機関用点火装置が放電制御を行う場合の要部信号波形と点火コイルの出力波形を示すタイミングチャートである。It is a timing chart which shows the principal part signal waveform in case the ignition device for internal combustion engines concerning a 1st embodiment performs discharge control, and the output waveform of an ignition coil. 本発明に係る内燃機関用点火装置の第２実施形態を示す概略構成図である。It is a schematic block diagram which shows 2nd Embodiment of the internal combustion engine ignition device which concerns on this invention. ＯＮ電圧防止用ダイオードを用いた内燃機関用点火装置の従来例を示す概略構成図である。It is a schematic block diagram which shows the prior art example of the internal combustion engine ignition device which used the diode for ON voltage prevention. 従来例の内燃機関用点火装置が放電制御を行う場合の要部信号波形と点火コイルの出力波形を示すタイミングチャートである。It is a timing chart which shows the principal part signal waveform in case the ignition device for internal combustion engines of a conventional example performs discharge control, and the output waveform of an ignition coil.

次に、本発明に係る内燃機関用点火装置の実施形態を、添付図面に基づいて詳細に説明する。   Next, an embodiment of an internal combustion engine ignition device according to the present invention will be described in detail based on the attached drawings.

図１に示すのは、本発明の第１実施形態に係る内燃機関用点火装置１であり、点火コイル２によって、気筒毎に設けられる点火プラグ２を放電させるものである。点火コイル２の一次コイル２１は、車載バッテリー等の直流電源（ＶＢ＋）に接続され、一次電流Ｉ１が流れる通電経路の途中に設けたメインスイッチング素子４のオン・オフを制御することで、一次電流Ｉ１の通電・遮断を切り替える。なお、メインスイッチング素子４としては、高耐圧性および高速スイッチング性に優れたＩＧＢＴ（Insulated Gate Bipolar Transistor：絶縁ゲートバイポーラトランジスタ）を用いることができる。   FIG. 1 shows an ignition device 1 for an internal combustion engine according to a first embodiment of the present invention, in which an ignition coil 2 discharges an ignition plug 2 provided for each cylinder. The primary coil 21 of the ignition coil 2 is connected to a DC power supply (VB +) such as a car battery, and controls the on / off of the main switching element 4 provided in the middle of the conduction path through which the primary current I1 flows. Switch I1 on / off. As the main switching element 4, an IGBT (Insulated Gate Bipolar Transistor) which is excellent in high breakdown voltage and high-speed switching performance can be used.

一次コイル２１と鉄心を介して磁気的に結合している二次コイル２２の一方端は点火プラグ３と接続され、二次コイル２２の他方端はＯＮ電圧防止用ダイオード２３を介して直流電源供給ラインと接続される。よって、点火コイル２の一次電流遮断時に二次側に発生する電圧によって流れる二次電流Ｉ２は、ＯＮ電圧防止用ダイオード２３の順方向となり、図１中に記載した二次電流Ｉ２の向きとは逆方向に流れる。   One end of a secondary coil 22 magnetically coupled to the primary coil 21 through an iron core is connected to the spark plug 3, and the other end of the secondary coil 22 is supplied with DC power via an ON voltage preventing diode 23. Connected with the line. Therefore, the secondary current I2 flowing by the voltage generated on the secondary side when the primary current of the ignition coil 2 is interrupted is in the forward direction of the diode for preventing ON voltage 23, and the direction of the secondary current I2 described in FIG. It flows in the opposite direction.

一方、一次コイル２１への通電開始時に二次コイル２２に生ずる逆極性のＯＮ電圧は、ＯＮ電圧防止用ダイオード２３によって阻止されるはずであるが、メインスイッチング素子４のＯＮ時に、一次コイル２１の持つ浮遊容量成分への突入電流によって電流値が急激に変化し、点火コイル２の二次側に発生する高電圧が誘導成分と容量成分による共振を起こして、立ち上がりの早いパルス状の振動電圧が発生すると、ＯＮ電圧防止用ダイオード２３によって阻止できない可能性がある。   On the other hand, the ON voltage of reverse polarity generated in the secondary coil 22 at the start of energization of the primary coil 21 should be blocked by the ON voltage preventing diode 23, but when the main switching element 4 is ON, The rush current to the stray capacitance component causes a sudden change in the current value, and the high voltage generated on the secondary side of the ignition coil 2 causes resonance due to the inductive component and the capacitive component, and the pulse-like oscillating voltage rises quickly. If it occurs, it may not be blocked by the ON voltage preventing diode 23.

そこで、本実施形態に係る内燃機関用点火装置１には、ＯＮ電圧抑制手段５を設けることで、正規の点火時期以前に点火プラグ３が放電してしまうようなＯＮ電圧が二次側に生ずることを防止する。   Therefore, by providing the ON voltage suppressing means 5 in the ignition device 1 for an internal combustion engine according to the present embodiment, an ON voltage is generated on the secondary side such that the spark plug 3 is discharged before the regular ignition timing. To prevent that.

このＯＮ電圧抑制手段５は、メイン点火信号（後に詳述）のＯＮタイミングに基づいてメインスイッチング素子４がメイン一次電流Ｉ１ｍの通電を開始する前に、二次側にパルス電圧を発生させない程度のサブ一次電流Ｉ１ｓを、一次コイル２１からメインスイッチング素子４を経ないバイパス通電路５１に流すことで、一次コイル２１の浮遊容量成分に充電を行うものである。すなわち、メインスイッチング素子４がＯＮになって、メイン一次電流Ｉ１ｍとサブ一次電流Ｉ１ｓの和である一次電流Ｉ１が流れるようになったとき、一次コイル２１の浮遊容量成分への充電が済んでいるので、一次コイル２１の持つ容量成分への突入電流によって電流値が急激に変化することはなく、点火コイル１０２の二次側に振動電圧が発生することを防止できる。   The ON voltage suppression means 5 does not generate a pulse voltage on the secondary side before the main switching element 4 starts energizing the main primary current I1m based on the ON timing of the main ignition signal (described in detail later). By flowing the sub-primary current I1s from the primary coil 21 to the bypass conduction path 51 not passing through the main switching element 4, the stray capacitance component of the primary coil 21 is charged. That is, when the main switching element 4 is turned on and the primary current I1, which is the sum of the main primary current I1m and the sub-primary current I1s, flows, charging of the stray capacitance component of the primary coil 21 is completed. Therefore, the rush current to the capacitance component of the primary coil 21 does not cause a sudden change in the current value, and the generation of the oscillating voltage on the secondary side of the ignition coil 102 can be prevented.

上述したＯＮ電圧抑制手段５の機能を、本実施形態では、バイパス通電路５１に設けるサブスイッチング素子５２、バイパス通電路５１に設ける電流制限手段５３、メインスイッチング素子４のＯＮ・ＯＦＦを制御するメイン点火信号Ｓ１を生成するメイン点火信号生成手段５４によって実現する。   In the present embodiment, the sub switching element 52 provided in the bypass current path 51, the current limiting means 53 provided in the bypass current path 51, and the main for controlling ON / OFF of the main switching element 4 in this embodiment. This is realized by the main ignition signal generating means 54 that generates the ignition signal S1.

まず、サブスイッチング素子５２は、サブ点火信号Ｓ２のＯＮ・ＯＦＦタイミングに基づいて、バイパス通電路５１に流れるサブ一次電流Ｉ１ｓの通電・遮断を切り替えるものである。サブ点火信号Ｓ２として、エンジンを統括的に制御する内燃機関制御装置（ＥＣＵ）より供給される点火信号Ｓ０をそのまま用いることにより、点火タイミングを指示する点火信号Ｓ０のＯＮ・ＯＦＦタイミングでサブ一次電流Ｉ１ｓの通電・遮断を切り替えることができる。なお、サブスイッチング素子５２としても、高耐圧性および高速スイッチング性に優れたＩＧＢＴを用いることができる。   First, the sub switching element 52 switches on / off of the sub primary current I1s flowing through the bypass current path 51 based on the on / off timing of the sub ignition signal S2. By using the ignition signal S0 supplied from the internal combustion engine control unit (ECU) that controls the engine in an integrated manner as the sub ignition signal S2 as it is, the sub primary current at the ON / OFF timing of the ignition signal S0 instructing ignition timing. It is possible to switch on / off of I1s. Also as the sub switching element 52, an IGBT excellent in high withstand voltage and high speed switching can be used.

電流制限手段５３は、一次コイル２１からバイパス通電路５１に流れるサブ一次電流Ｉ１ｓを、二次側にパルス電圧を発生させない程度の微小電流値に抑制するものである。この電流制限手段５３としては、バイパス通電路５１に設けた電流制限抵抗５３ａ、あるいはバイパス通電路５１に設けたインダクタンス５３ｂによって、簡易且つ廉価に構成することができる（図２（ａ），（ｂ）を参照）。   The current limiting means 53 suppresses the sub primary current I1s flowing from the primary coil 21 to the bypass current path 51 to a minute current value that does not generate a pulse voltage on the secondary side. The current limiting means 53 can be configured simply and inexpensively by the current limiting resistor 53a provided in the bypass conducting path 51 or the inductance 53b provided in the bypass conducting path 51 (FIGS. 2A and 2B). See)).

メイン点火信号生成手段５４は、ＥＣＵからの点火信号Ｓ０を受け、点火信号Ｓ０のＯＮタイミングを予め定めたメイン点火遅延時間ｄだけ遅らせると共に、ＯＦＦタイミングは点火信号Ｓ０に同期させたメイン点火信号Ｓ１を生成し、メインスイッチング素子４へ供給する。これにより、既存のＥＣＵからの点火信号Ｓ０を用いて、サブ一次電流Ｉ１ｓの通電開始よりメイン点火遅延時間ｄだけ遅らせてメイン一次電流Ｉ１ｍが流れ始めるように制御でき、サブ一次電流Ｉ１ｓの通電終了と同期させてメイン一次電流Ｉ１ｍを遮断できる。   The main ignition signal generation means 54 receives the ignition signal S0 from the ECU and delays the ON timing of the ignition signal S0 by a predetermined main ignition delay time d, and the OFF timing is synchronized with the ignition signal S0. Are supplied to the main switching element 4. As a result, using the ignition signal S0 from the existing ECU, control can be performed so that the main primary current I1m starts to flow delayed by the main ignition delay time d from the start of energization of the sub primary current I1s, and termination of energization of the sub primary current I1s The main primary current I1m can be shut off in synchronization with

なお、新規にＥＣＵを設計してＯＮ電圧抑制手段５を設ける場合には、メイン点火信号生成手段５４の機能をＥＣＵに持たせておき、ＥＣＵが生成したメイン点火信号Ｓ１とサブ点火信号Ｓ２を、それぞれメインスイッチング素子４とサブスイッチング素子５２へ供給するようにしても構わない。   When the ECU is newly designed and the ON voltage suppressing means 5 is provided, the function of the main ignition signal generating means 54 is provided to the ECU, and the main ignition signal S1 and the sub ignition signal S2 generated by the ECU are Alternatively, they may be supplied to the main switching element 4 and the sub switching element 52, respectively.

上記のように構成した内燃機関用点火装置１による点火動作を、図３に示すタイミングチャートを参照しつつ説明する。   The ignition operation by the internal combustion engine ignition device 1 configured as described above will be described with reference to the timing chart shown in FIG.

ＥＣＵより供給される点火信号Ｓ０（サブ点火信号Ｓ２）がＯＮになる（信号電位がＬレベルからＨレベルに変化する）タイミングでサブスイッチング素子５２がＯＮとなり、バイパス通電路５１を経て一次電流Ｉ１が流れるようになる。このとき、バイパス通電路５１には電流制限手段５３が設けてあることで、バイパス通電路５１を流れるサブ一次電流Ｉ１ｓは、二次側に立ち上がりの早いパルス電圧を発生させない程度の小電流（例えば、数百ｍＡ程度）に抑えられている。   The sub switching element 52 is turned on at the timing when the ignition signal S0 (sub ignition signal S2) supplied from the ECU is turned on (the signal potential changes from L level to H level), and the bypass current path 51 passes through the primary current I1. Will flow. At this time, since the current limiting means 53 is provided in the bypass current path 51, the sub primary current I1s flowing through the bypass current path 51 has a small current (for example, a pulse current which does not rise quickly on the secondary side) And several hundred mA).

よって、点火コイル２の二次側に発生する電圧は、立ち上がりの早くない誘導成分に応じたＯＮ電圧Ｖ１よりも少し高い程度の電圧Ｖ３にとどめることができ、ＯＮ電圧防止用ダイオード２３によって確実に阻止できる。   Therefore, the voltage generated on the secondary side of the ignition coil 2 can be kept at a voltage V3 slightly higher than the ON voltage V1 according to the induction component not rising quickly, and the ON voltage prevention diode 23 reliably. You can stop it.

上記のように、バイパス通電路５１にサブ一次電流Ｉ１ｓを流し始めて、一次コイル２１の浮遊容量成分を充電するのに必要十分な時間として予め設定したメイン点火遅延時間ｄが経過すると、メイン点火信号Ｓ１がＯＮになり（信号電位がＬレベルからＨレベルに変化し）、このタイミングでメインスイッチング素子４がＯＮとなり、バイパス通電路５１へ分岐しない経路にメイン一次電流Ｉ１ｍが流れるようになる。このとき、一次コイル２１の浮遊容量成分は、メイン点火遅延時間ｄが経過するまでサブ一次電流Ｉ１ｓを流すことで充電されているので、メインスイッチング素子４がＯＮになっても、一次コイル２１の浮遊容量成分への突入電流は発生せず、二次側に生ずるＯＮ電圧はＶ１程度にとどまる。したがって、メインスイッチング素子４がＯＮになったタイミングで、点火コイル２の二次側に発生するＯＮ電圧も、ＯＮ電圧防止用ダイオード２３によって確実に阻止できる。   As described above, when the main ignition delay time d, which is set in advance as the time necessary for charging the stray capacitance component of the primary coil 21, starts to flow the sub primary current I1s in the bypass current path 51, the main ignition signal S1 is turned ON (the signal potential changes from L level to H level), and at this timing, the main switching element 4 is turned ON, and the main primary current I1m flows in a path which is not branched to the bypass conduction path 51. At this time, since the stray capacitance component of the primary coil 21 is charged by passing the sub primary current I1s until the main ignition delay time d elapses, even if the main switching element 4 is turned on, the stray capacitance component of the primary coil 21 is No rush current is generated to the stray capacitance component, and the ON voltage generated on the secondary side remains at about V1. Therefore, the ON voltage generated on the secondary side of the ignition coil 2 can be reliably blocked by the ON voltage prevention diode 23 at the timing when the main switching element 4 is turned ON.

その後、ＥＣＵからの点火信号Ｓ０がＯＦＦになる（信号電位がＨレベルからＬレベルに変化する）タイミングで、メインスイッチング素子４とサブスイッチング素子５２が同時にＯＦＦとなり、一次電流Ｉ１（メイン一次電流Ｉ１ｍ＋サブ一次電流Ｉ１ｓ）が遮断されることで二次側に高電圧が発生し、点火プラグ３の放電ギャップに絶縁破壊が生じ、ＯＮ電圧防止用ダイオード２３の順方向へ二次電流Ｉ２が流れる。   Thereafter, at the timing when the ignition signal S0 from the ECU is turned off (the signal potential changes from H level to L level), the main switching element 4 and the sub switching element 52 are simultaneously turned off, and the primary current I1 (main primary current I1m + The interruption of the sub-primary current I1s) generates a high voltage on the secondary side, causing dielectric breakdown in the discharge gap of the spark plug 3 and causing the secondary current I2 to flow in the forward direction of the diode 23 for preventing ON voltage.

以上のように、本実施形態の内燃機関用点火装置１においては、ＯＮ電圧抑制手段５の機能によって、立ち上がりの早いパルス電圧が一次コイル２１の誘導成分によるＯＮ電圧に重畳されることを防ぎ、ＯＮ電圧防止用ダイオード２３によって防止できる程度のＯＮ電圧に抑制できる。そして、このＯＮ電圧防止用ダイオード２３が十分機能することで、一次コイル２１への通電時に発生するＯＮ電圧によって点火プラグ３に異常放電が生ずることを防止でき、燃焼制御の動作信頼性を高めることができる。   As described above, in the internal combustion engine ignition device 1 of the present embodiment, the function of the ON voltage suppression means 5 prevents the pulse voltage of the early rise from being superimposed on the ON voltage by the induction component of the primary coil 21. The ON voltage can be suppressed to a level that can be prevented by the ON voltage preventing diode 23. Then, the diode 23 for preventing the ON voltage sufficiently functions to prevent the occurrence of abnormal discharge in the spark plug 3 due to the ON voltage generated when the primary coil 21 is energized, thereby enhancing the operation reliability of the combustion control. Can.

しかも、電流制限手段５３は、電流制限抵抗５３ａやインダクタンス５３ｂで構成でき、メイン点火信号生成手段５４は、ＯＮ遅延・ＯＦＦ同期の遅延回路として、ディスクリート部品を用いた比較的単純なアナログ回路で構成できることから、ＯＮ電圧抑制手段５を設けることによる追加コストを抑えられる。   Moreover, the current limiting means 53 can be constituted by the current limiting resistor 53a and the inductance 53b, and the main ignition signal generating means 54 is constituted by a relatively simple analog circuit using discrete components as a delay circuit of ON delay and OFF synchronization. Since it is possible, the additional cost by providing the ON voltage suppression means 5 can be suppressed.

上述した第１実施形態の内燃機関用点火装置１は、バイパス通電路５１に電流制限手段５３を設けることで、サブ一次電流Ｉ１ｓを小電流に制限したが、これに限定されるものでは無い。例えば、図４に示す第２実施形態の内燃機関用点火装置１′のＯＮ電圧抑制手段５′は、サブ点火信号生成手段５５で生成したサブ点火信号Ｓ２′によってサブスイッチング素子５２′のゲート印加電圧を調整してコレクタ−エミッタ間を流れる電流の流量を抑制し、バイパス通電路５１を流れるサブ一次電流Ｉ１ｓを小電流に制限するものである。   The ignition device 1 for an internal combustion engine according to the first embodiment described above limits the sub primary current I1s to a small current by providing the current limiting means 53 in the bypass current path 51, but is not limited to this. For example, the ON voltage suppression means 5 'of the internal combustion engine ignition device 1' of the second embodiment shown in FIG. 4 applies the gate of the sub switching element 52 'by the sub ignition signal S2' generated by the sub ignition signal generation means 55. The voltage is adjusted to suppress the flow rate of the current flowing between the collector and the emitter, and the sub primary current I1s flowing through the bypass current path 51 is limited to a small current.

第２実施形態の内燃機関用点火装置１′では、ＯＮ電圧抑制手段５′の機能を、バイパス通電路５１に設けるサブスイッチング素子５２′、サブスイッチング素子５２′のＯＮ・ＯＦＦを制御するサブ点火信号Ｓ２′を生成するサブ点火信号生成手段５５、メインスイッチング素子４のＯＮ・ＯＦＦを制御するメイン点火信号Ｓ１を生成するメイン点火信号生成手段５４によって実現する。なお、メイン点火信号生成手段５４は、第１実施形態と同様の構成で構わない。   In the internal combustion engine ignition device 1 'of the second embodiment, the sub switching element 52' provided on the bypass current path 51 and the sub ignition for controlling the ON / OFF of the sub switching element 52 ' This is realized by a sub ignition signal generation unit 55 that generates a signal S2 'and a main ignition signal generation unit 54 that generates a main ignition signal S1 that controls ON / OFF of the main switching element 4. The main ignition signal generating means 54 may have the same configuration as that of the first embodiment.

まず、サブスイッチング素子５２′は、バイパス通電路５１に設けられ、入力されるサブ点火信号Ｓ２′に応じてサブ一次電流Ｉ１ｓ′の流量を制御するもので、耐圧特性およびスイッチング特性に優れたＩＧＢＴ等のパワートランジスタを用いることができる。但し、一次コイル２１からバイパス通電路５１に流れるサブ一次電流Ｉ１ｓ′は、一次コイル２１の容量成分への突入電流によって点火コイル２の二次側にパルス電圧を発生させない程度の微小電流値に抑制する必要があるので、ゲート−エミッタ間電圧によってコレクタ−エミッタ間電圧を直線的に制御できる線形領域が広い素子をサブスイッチング素子５２′として用いることが望ましい。   First, the sub switching element 52 'is provided in the bypass current path 51 and controls the flow rate of the sub primary current I1s' in accordance with the input sub ignition signal S2', and is an IGBT excellent in withstand voltage characteristics and switching characteristics Power transistors can be used. However, the sub-primary current I1s' flowing from the primary coil 21 to the bypass current path 51 is suppressed to a minute current value that does not generate a pulse voltage on the secondary side of the ignition coil 2 by the rush current to the capacitive component of the primary coil 21 It is desirable to use an element having a wide linear region which can control the collector-emitter voltage linearly by the gate-emitter voltage as the sub-switching element 52 '.

サブ点火信号生成手段５５は、ＥＣＵより供給される点火信号Ｓ０を受け、少なくとも点火信号Ｓ０のＯＮタイミング（信号の電位レベルがＬからＨに変化した時点）からメイン点火遅延時間ｄが経過するまで、点火コイル２の二次側にパルス電圧を発生させない程度のサブ一次電流Ｉ１ｓ′をバイパス通電路５１に流し、点火信号Ｓ０のＯＦＦタイミング（信号の電位レベルがＨからＬに変化した時点）でサブ一次電流Ｉ１ｓ′を遮断するサブ点火信号Ｓ２′を生成する。このサブ点火信号Ｓ２′は、サブスイッチング素子５２′のゲートへ供給され、ゲート−エミッタ間電圧を制御し、意図した小電流がサブ一次電流Ｉ１ｓ′としてバイパス通電路５１を流れるように、コレクタ−エミッタ間電圧を制御する。   The sub ignition signal generation unit 55 receives the ignition signal S0 supplied from the ECU, and at least until the main ignition delay time d elapses from the ON timing of the ignition signal S0 (when the potential level of the signal changes from L to H). The sub-primary current I1s' which does not generate a pulse voltage on the secondary side of the ignition coil 2 is supplied to the bypass current path 51, and the OFF timing of the ignition signal S0 (at the point when the potential level of the signal changes from H to L). A sub ignition signal S2 'is generated to interrupt the sub primary current I1s'. The sub ignition signal S2 'is supplied to the gate of the sub switching element 52' to control the voltage between the gate and the emitter, so that the intended small current flows in the bypass conduction path 51 as the sub primary current I1s'. Control the voltage between emitters.

かくして、第２実施形態に係る内燃機関用点火装置１′においても、上述した第１実施形態に係る内燃機関用点火装置１と同様に、ＯＮ電圧抑制手段５′の機能によって、立ち上がりの早いパルス電圧が一次コイル２１の誘導成分によるＯＮ電圧に重畳されることを防ぎ、ＯＮ電圧防止用ダイオード２３によって防止できる程度のＯＮ電圧に抑制できる。そして、このＯＮ電圧防止用ダイオード２３が十分機能することで、一次コイル２１への通電時に発生するＯＮ電圧によって点火プラグ３に異常放電が生ずることを防止でき、燃焼制御の動作信頼性を高めることができる。   Thus, in the internal combustion engine ignition device 1 'according to the second embodiment, too, as with the internal combustion engine ignition device 1 according to the first embodiment described above, a pulse with an early rise due to the function of the ON voltage suppression means 5'. The voltage can be prevented from being superimposed on the ON voltage due to the induction component of the primary coil 21, and the ON voltage can be suppressed to such an extent that the diode 23 can prevent the voltage. Then, the diode 23 for preventing the ON voltage sufficiently functions to prevent the occurrence of abnormal discharge in the spark plug 3 due to the ON voltage generated when the primary coil 21 is energized, thereby enhancing the operation reliability of the combustion control. Can.

なお、サブ点火信号生成手段５５によって生成するサブ点火信号Ｓ２′は、メイン点火遅延時間ｄが経過するまで、サブスイッチング素子５２′のコレクタ−エミッタ間電圧を所望の値に制御できる所定電圧を出力し続けるものに限らず、サブ一次電流Ｉ１ｍ′を徐々に増加させてゆきつつ、一次コイル２１の浮遊容量成分への充電を行うようにしても良い。かくすれば、サブ一次電流Ｉ１ｓ′の通電開始直後に、コイル２の二次側に急峻な高電圧が生じないソフトＯＮ制御を行うことができる。   The sub ignition signal S2 'generated by the sub ignition signal generation means 55 outputs a predetermined voltage capable of controlling the collector-emitter voltage of the sub switching element 52' to a desired value until the main ignition delay time d elapses. Not limited to the above, the sub-primary current I1m 'may be gradually increased while the stray capacitance component of the primary coil 21 may be charged. In this way, it is possible to perform the soft ON control in which no steep high voltage is generated on the secondary side of the coil 2 immediately after the start of energization of the sub primary current I1s'.

以上、本発明に係る内燃機関用点火装置の実施形態を添付図面に基づいて説明したが、本発明は、これらの実施形態に限定されるものではなく、特許請求の範囲に記載の構成を変更しない範囲で、公知既存の等価な技術手段を転用することにより実施しても構わない。   As mentioned above, although the embodiment of the ignition device for internal combustion engines concerning the present invention was described based on an accompanying drawing, the present invention is not limited to these embodiments, and changes the composition as described in a claim In addition, the present invention may be implemented by diverting known existing technical means.

１ 内燃機関用点火装置
２ 点火コイル
２１ 一次コイル
２２ 二次コイル
２３ ＯＮ電圧防止用ダイオード
３ 点火プラグ
４ メインスイッチング素子
５ ＯＮ電圧抑制手段
５１ バイパス通電路
５２ サブスイッチング素子
５３ 電流制限手段
５４ メイン点火信号生成手段 DESCRIPTION OF SYMBOLS 1 Ignition device for internal combustion engines 2 Ignition coil 21 Primary coil 22 Diode for ON voltage prevention 3 Spark plug 4 Main switching element 5 ON voltage suppression means 51 Bypass conduction path 52 Sub switching element 53 Current restriction means 54 Main ignition signal Generation means

Claims (1)

気筒毎に設けられる１つの点火プラグと、
一次電流が流れる一次コイルと、該一次コイルと磁気的に結合しており、一次電流の遮断時に高電圧が発生して、前記点火プラグに二次電流を流す二次コイルと、を備える点火コイルと、
前記点火プラグの放電経路に設けられ、前記点火コイルの一次電流遮断時に二次側に発生する電圧とは逆極性のＯＮ電圧を防止するＯＮ電圧防止用ダイオードと、
前記点火コイルの一次コイルに流れる一次電流の通電・遮断を、メイン点火信号のＯＮ・ＯＦＦタイミングに基づいて切り替えるメインスイッチング素子と、
前記メイン点火信号のＯＮタイミングに基づいてメインスイッチング素子がメイン一次電流の通電を開始する前に、二次側にパルス電圧を発生させない程度のサブ一次電流を、一次コイルからメインスイッチング素子を経ないバイパス通電路に流すことで、一次コイルの浮遊容量成分に充電を行うＯＮ電圧抑制手段と、
を設け、
前記ＯＮ電圧抑制手段は、
前記バイパス通電路に設けられ、入力されるサブ点火信号に応じてサブ一次電流の流量を制御するサブスイッチング素子と、
内燃機関制御装置より供給される点火信号を受け、少なくとも点火信号のＯＮタイミングから予め定めたメイン点火遅延時間が経過するまで、二次側にパルス電圧を発生させない程度のサブ一次電流をバイパス通電路に流し、点火信号のＯＦＦタイミングでサブ一次電流を遮断するサブ点火信号を生成し、前記サブスイッチング素子へ供給するサブ点火信号生成手段と、
前記内燃機関制御装置からの点火信号を受け、該点火信号のＯＮタイミングをメイン点火遅延時間だけ遅らせたメイン点火信号を生成し、前記メインスイッチング素子へ供給するメイン点火信号生成手段と、
で構成し、
前記サブ点火信号生成手段は、サブ一次電流を徐々に増加させるようなサブ点火信号を生成することで、コイルの二次側に急峻な高電圧が生じないソフトＯＮ制御を行うようにしたことを特徴とする内燃機関用点火装置。 One spark plug provided for each cylinder,
An ignition coil comprising: a primary coil through which a primary current flows; and a secondary coil that is magnetically coupled to the primary coil and generates a high voltage when the primary current is shut off to cause a secondary current to flow through the spark plug. When,
An ON voltage prevention diode provided in the discharge path of the spark plug, for preventing an ON voltage of the reverse polarity to the voltage generated on the secondary side when the primary current of the ignition coil is interrupted;
A main switching element for switching on / off of a primary current flowing through a primary coil of the ignition coil based on ON / OFF timing of a main ignition signal;
Before the main switching element starts energizing the main primary current based on the ON timing of the main ignition signal, the sub-primary current which does not generate a pulse voltage on the secondary side does not pass from the primary coil to the main switching element ON voltage suppression means for charging the stray capacitance component of the primary coil by flowing in the bypass current path;
The provided
The ON voltage suppression means is
A sub switching element provided in the bypass current path and controlling a flow rate of a sub primary current according to an input sub ignition signal;
The sub-primary current not generating pulse voltage on the secondary side is bypassed until the main ignition delay time predetermined at least from the ON timing of the ignition signal elapses in response to the ignition signal supplied from the internal combustion engine control device. Sub-ignition signal generating means for generating a sub-ignition signal for interrupting the sub-primary current at the OFF timing of the ignition signal and supplying the sub-ignition signal to the sub-switching element;
Main ignition signal generation means for generating a main ignition signal which receives the ignition signal from the internal combustion engine control device, delays the ON timing of the ignition signal by the main ignition delay time, and supplies the main ignition signal to the main switching element;
Composed of
The sub-ignition signal generation means generates a sub-ignition signal that gradually increases the sub-primary current, thereby performing soft ON control in which no steep high voltage is generated on the secondary side of the coil. An ignition device for an internal combustion engine characterized by the present invention .
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11898528B2 (en) 2022-06-07 2024-02-13 Diamond & Zebra Electric Mfg. Co., Ltd. Ignition device

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* Cited by examiner, † Cited by third party
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DE112019000214T5 (en) * 2018-02-01 2020-08-13 Hitachi Automotive Systems, Ltd. Ignition device for internal combustion engine

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JPS6394080A (en) * 1986-10-08 1988-04-25 Hanshin Electric Co Ltd Low voltage distribution type igniter for internal combustion engine
DE19711204C2 (en) * 1997-03-18 1999-01-14 Bosch Gmbh Robert Circuit arrangement of an ignition output stage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11898528B2 (en) 2022-06-07 2024-02-13 Diamond & Zebra Electric Mfg. Co., Ltd. Ignition device

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