JPS641665B2 - - Google Patents
Info
- Publication number
- JPS641665B2 JPS641665B2 JP7358481A JP7358481A JPS641665B2 JP S641665 B2 JPS641665 B2 JP S641665B2 JP 7358481 A JP7358481 A JP 7358481A JP 7358481 A JP7358481 A JP 7358481A JP S641665 B2 JPS641665 B2 JP S641665B2
- Authority
- JP
- Japan
- Prior art keywords
- high voltage
- voltage
- voltage diode
- ignition device
- spark plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000008188 pellet Substances 0.000 claims description 36
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims 6
- 238000010030 laminating Methods 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 27
- 229910052710 silicon Inorganic materials 0.000 description 27
- 239000010703 silicon Substances 0.000 description 27
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 150000003376 silicon Chemical class 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
- F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Description
本発明は内燃機関用点火装置に係り、特に点火
コイルから供給される高電圧エネルギを高圧ダイ
オードによつて分配し複数の点火プラグへ配電す
る内燃機関用点火装置の高圧ダイオードの取付構
造に関する。
第１図は、例えば特開昭55−112870号公報等に
知られる様に、従来の自動車用４気筒エンジンの
点火系回路図である。点火コイル１の一次コイル
２及び３の共通端子はバツテリ４の正極端子に接
続され、他端はそれぞれダイオードＤ５，Ｄ６を
介してパワートランジスタＱ１，Ｑ２のコレクタ
に接続されている。パワートランジスタＱ１，Ｑ
２のベースは増幅器５の小信号増幅部６に接続さ
れエミツタは接地されている。増幅器５の小信号
増幅部６には入力端子７，８が設けられており電
気信号S1，S2が入力される。
一方、点火コイル１の二次コイル９の出力端１
０は高圧ダイオードＤ１のカソードと高圧ダイオ
ードＤ２のアノードに接続され、高圧ダイオード
D1のアノードはエンジンの第１気筒の点火プラ
グＰ１に接続され、高圧ダイオードＤ２のカソー
ドは第２気筒の点火プラグＰ２に接続されてい
る。また、二次コイル９の出力端１１は高圧ダイ
オードＤ３のカソードと高圧ダイオードＤ４のア
ノードに接続され、高圧ダイオードＤ３のアノー
ドは第３気筒の点火プラグＰ３に接続され、高圧
ダイオードＤ４のカソードは第４気筒の点火プラ
グＰ４に接続されている。
第２図は第１図に示した点火系回路の動作を説
明するタイムチヤートである。増幅器５の入力端
子７及び８からエンジンの回転に同期した電気信
号Ｓ１及びＳ２が入力される。電気信号Ｓ１の値
は時間Ｔ１〜Ｔ２及びＴ５〜Ｔ６の間では１であ
り、電気信号Ｓ２の値は時間Ｔ３〜Ｔ４及びＴ７
〜Ｔ８の間で１となる。このようにＳ１，Ｓ２の
値を交互に１にすると、パワートランジスタＱ１
とＱ２が交互に導通状態となつて一次コイル２及
び３に交互に電流Ｉ１及びＩ２が流れる。なお、
この電流Ｉ１及びＩ２の波形は図に示す如く鋸歯
状となつている。
一次コイル２に流れた電流Ｉ１が遮断された時
は第１図の実線で示す極性の高電圧Ａ１が発生す
る。この高電圧Ａ１は高圧ダイオードＤ１とＤ４
を通して点火プラグＰ１とＰ４にこの高電圧が印
加され、点火プラグＰ１とＰ４に火花放電Ｖ１と
Ｖ４が発生する。また、一次コイル３に流れた電
流Ｉ２が遮断された時は二次コイル６に第１図波
線で示す極性の高電圧Ａ２が発生する。この高電
圧Ａ２は高圧ダイオードＤ２とＤ３を通して点火
プラグＰ２とＰ３に印加され、点火プラグＰ２と
Ｐ３に火花放電Ｖ２とＶ３が発生する。
ここで、第１気筒と第４気筒のピストンはクラ
ンク角で360度異なつた位置関係にあり、第１気
筒の点火時期では第４気筒は排気行程となつてい
る。従つて、上記の如く第１気筒の点火プラグＰ
１と第４気筒の点火プラグＰ４に火花放電が同時
に発生してもエンジンの運転に支障をきたすこと
はない。同様なことが第２気筒と第３気筒の点火
プラグに関しても言える。なお、第６図の最下段
にはクランク角度と上記点火時期との関係が示さ
れており、クランクが２回転する間に各点火プラ
グに２回ずつ火花放電が発生し、最初の状態に復
帰する。
ところで、高圧ダイオードＤ１乃至Ｄ４にはエ
ンジンの運転中点火プラグＰ１乃至Ｐ４の放電電
圧に等しい電圧が逆方向に印加される。例えば、
第１気筒の点火時期、即ち時間Ｔ２においては高
圧ダイオードＤ４には点火プラグＰ４の放電電圧
が逆方向に印加される。この点火プラグの放電電
圧は運転条件及びエンジンによつて異なるが、高
い場合には30KV程度になる。このため、高圧ダ
イオードＤ１乃至Ｄ４の逆方向耐電圧は30KV以
上必要となる。
高圧ダイオードＤ１乃至Ｄ４は上記の逆方向耐
電圧を得るために第３図に示すような構造を有し
ている。即ち、逆方向耐電圧が約1.5KVのシリコ
ンペレツト１０１を20〜30枚程積層し、この積層
したものの両端に電極１０２及びリード線１０３
を取付け、これらをガラスモールド１０４にて一
体にモールドした構成となつている。
次に、上記のような構造の高圧ダイオードＤ１
乃至Ｄ４に印加される逆方向電圧をEoとした場
合に、各シリコンペレツト１０１に印加される電
圧について説明する。印加電圧の周波数が低い場
合には各シリコンペレツト１０１に電圧は均等に
分但される。例えば、シリコンペレツトの数をｎ
とすれば各シリコンペレツト１０１に印加される
電圧Eo1は＝Eo／ｎとなる。しかし、点火装置に
おいては点火プラグで火花放電を発生する時に、
立上り時間が10nS程度の高周波電圧が高圧ダイ
オードＤ１乃至Ｄ４に印加される。このため、各
シリコンペレツト１０１に印加される電圧は均等
にならず、点火プラグＰ１〜Ｐ４に接続されてい
る側のシリコンペレツト１０１に電圧が集中的に
印加される現象が発生する。従つて、これらのシ
リコンペレツト１０１には前述したEo1＝Eo／ｎ
に比べ著しく大きな電圧が印加される。この結
果、シリコンペレツト１０１の積層枚数を増加し
ても、点火プラグに使用した場合の実質的逆方向
耐電圧は大幅に増加させることができない欠点が
生じる。従つて、点火エネルギを上記構造の高圧
ダイオードによつて分配し、複数の点火プラグに
配電する内燃機関用点火装置を実用化するには上
記の欠点を解決しなければならない。即ち、点火
プラグで火花放電を発生した時の高周波電圧に対
しても、30KV以上の逆方向耐電圧が確保できる
ような高圧ダイオード及びその取付方法の開発が
要請されている。
本発明の目的は上記の欠点に鑑み、高圧ダイオ
ードを構成するシリコンペレツトに加わる電圧を
均一化して分担させた小形で耐電圧性能の優れた
内燃機関用点火装置を提供するにある。
本発明により上記の目的は、高圧ダイオードを
構成するシリコンペレツトの点火プラグに接続さ
れる側に近接して導電性の電極を設け、この電極
を高圧ダイオードの点火プラグに接続される側の
出力端と同電位として前記シリコンペレツトの分
布容量を大きくすることにより、高周波電圧印加
時の電圧集中を緩和することによつて達成され
る。
以下、本発明の実施例を図面に従つて説明す
る。
第４図は本発明に係る内燃機関用点火装置の一
実施例を示した断面図である。但し第１図と同様
あるいは同一構成部分は同一符号を用いて示して
ある。
ボビン１２に一次コイル２，３が巻回され、こ
の一次コイル２の巻始めは一次端子１３にその巻
終り及び一次コイル３の巻始めは共に一次端子１
４に、また一次コイル３の巻終りは一次端子１５
に接続されている。一方、二次コイル９は合成樹
脂製のケース１６に収納されて一次コイル２，３
の外周に装着されている。この二次コイル９は２
つのボビン１７に積層巻回された後、直列接続さ
れて前記ケース１６内に収納されている。
二次コイル９の巻終り端１０，１１はケース１
６に取付けられた二次端子１８，１９にそれぞれ
接続されている。また、二次コイル９を収納した
ケース１６の中央孔に前記一次コイル２，３を巻
回したボビン１２が挿入され、しかる後にエポキ
シ系樹脂組成物２０を真空中にて含浸させて加熱
硬化させてある。一次コイル２，３を巻回したボ
ビン１２の中央孔にはＬ字形の硅素鋼板を積層し
たコア２１を挿入し、ケース１６を包囲するコア
２２と組合わせて一組の閉磁路鉄心が形成されて
いる。
高圧ダイオードＤ１〜Ｄ４は第３図に示したも
のと同一のもので、合成樹脂製のケース２３内に
収納され、各高圧ダイオードの一端はケース２３
に一体に成形された高圧端子２４，２５，２６，
２７にそれぞれ接続されている。また、高圧ダイ
オードＤ１，Ｄ２の他端はケース２３に取付けら
れたダイオード端子２８に、高圧ダイオードＤ
３，Ｄ４の他端は同様にダイオード端子２９に接
続されている。このケース２３内にもエポキシ系
樹脂組成物２０を注入した後、加熱硬化させて高
圧ダイオード部が形成される。更に、前記ダイオ
ード端子２８，２９は前記二次端子１８，１９に
接続し、上記全ての構成部分は合成樹脂３０で一
体に被覆して点火コイル１が形成される。
第５図は第４図で示した高圧ダイオードの取付
部分の詳細を示した図であり、本実施例の特徴部
分である。即ち、高圧端子２４（高圧端子２５，
２６，２７も同じ）は高圧ダイオードＤ１（Ｄ
２，Ｄ３，Ｄ４も同じ）のガラスモールド１０４
の外径より約２mm大きな内径の笠状部分（導電性
電極）１０５を有している。この高圧ダイオード
Ｄ１の高圧端子２４に接続される側の一部は、全
長の約30％の部分を上記した笠状部分１０５内に
入り込むように取付けられている。なお、他の高
圧ダイオードＤ２〜Ｄ４についても同様である。
第５図に示したように高圧ダイオードＤ１〜Ｄ
４を取付けると、高圧端子の笠状部分１０５と、
高圧ダイオードの高圧端子２４〜２７に近い側の
シリコンペレツト１０１との間の分布容量が大き
くなる。この分布容量の増大によつて、点火プラ
グＰ１〜Ｐ４で火花放電を発生させた時の高周波
電圧が高圧ダイオードＤ１〜Ｄ４に印加された時
に、高圧端子２４〜２７に近い側のシリコンペレ
ツト１０１に電圧が集中するのを防止することが
できる。
次に上記の電圧集中防止効果について説明す
る。高圧ダイオードＤ１〜Ｄ４（以下Ｄ１で代表
する）に立上り時間10nS程度の電圧が印加され
た場合、各シリコンペレツト１０１の分担電圧に
ついて考える場合、シリコンペレツト１０１と高
圧端子２４との間は静電容量で等価して考えるこ
とができる。このような考え方で、立上り時間
10nSの急峻波の電圧を高圧ダイオードＤ１に印
加した場合の各シリコンペレツト１０１に印加さ
れる電圧を計算した結果第６図に示すようにな
る。
この第６図の例はシリコンペレツト１０１を30
枚積層して高圧ダイオードを構成した場合のもの
で、横軸はシリコンペレツトの枚数を示し、図中
左が点火プラグ側、右が二次コイル側を示してお
り、縦軸は各シリコンペレツトの電圧分担率を示
The present invention relates to an ignition system for an internal combustion engine, and more particularly to a high-voltage diode mounting structure for an ignition system for an internal combustion engine that distributes high-voltage energy supplied from an ignition coil to a plurality of spark plugs using a high-voltage diode. FIG. 1 is an ignition system circuit diagram of a conventional four-cylinder automobile engine, as known from, for example, Japanese Patent Application Laid-open No. 55-112870. A common terminal of primary coils 2 and 3 of ignition coil 1 is connected to a positive terminal of battery 4, and the other end is connected to the collectors of power transistors Q1 and Q2 via diodes D5 and D6, respectively. Power transistor Q1, Q
The base of 2 is connected to the small signal amplification section 6 of the amplifier 5, and the emitter is grounded. The small signal amplification section 6 of the amplifier 5 is provided with input terminals 7 and 8, and electrical signals S 1 and S 2 are input thereto. On the other hand, the output end 1 of the secondary coil 9 of the ignition coil 1
0 is connected to the cathode of high voltage diode D1 and the anode of high voltage diode D2, and
The anode of D1 is connected to the spark plug P1 of the first cylinder of the engine, and the cathode of the high-pressure diode D2 is connected to the spark plug P2 of the second cylinder. Further, the output end 11 of the secondary coil 9 is connected to the cathode of the high voltage diode D3 and the anode of the high voltage diode D4, the anode of the high voltage diode D3 is connected to the spark plug P3 of the third cylinder, and the cathode of the high voltage diode D4 is connected to the third cylinder spark plug P3. It is connected to the 4-cylinder spark plug P4. FIG. 2 is a time chart explaining the operation of the ignition system circuit shown in FIG. Electric signals S1 and S2 synchronized with the rotation of the engine are inputted from input terminals 7 and 8 of the amplifier 5. The value of the electrical signal S1 is 1 between times T1-T2 and T5-T6, and the value of the electrical signal S2 is 1 between times T3-T4 and T7.
It becomes 1 between T8 and T8. When the values of S1 and S2 are alternately set to 1 in this way, the power transistor Q1
and Q2 alternately become conductive, and currents I1 and I2 alternately flow through the primary coils 2 and 3. In addition,
The waveforms of the currents I1 and I2 have a sawtooth shape as shown in the figure. When the current I1 flowing through the primary coil 2 is interrupted, a high voltage A1 having the polarity shown by the solid line in FIG. 1 is generated. This high voltage A1 is connected to high voltage diodes D1 and D4.
This high voltage is applied to the spark plugs P1 and P4 through the spark plugs P1 and P4, and spark discharges V1 and V4 are generated at the spark plugs P1 and P4. Furthermore, when the current I2 flowing through the primary coil 3 is cut off, a high voltage A2 having the polarity indicated by the broken line in FIG. 1 is generated in the secondary coil 6. This high voltage A2 is applied to spark plugs P2 and P3 through high voltage diodes D2 and D3, and spark discharges V2 and V3 are generated at spark plugs P2 and P3. Here, the pistons of the first cylinder and the fourth cylinder are in a positional relationship that differs by 360 degrees in terms of crank angle, and the fourth cylinder is in the exhaust stroke at the ignition timing of the first cylinder. Therefore, as mentioned above, the spark plug P of the first cylinder
Even if spark discharge occurs simultaneously in the spark plugs P4 of the first and fourth cylinders, the operation of the engine will not be affected. The same thing can be said about the spark plugs of the second and third cylinders. The relationship between the crank angle and the above ignition timing is shown at the bottom of Figure 6. Spark discharge occurs twice in each spark plug during two revolutions of the crank, and the spark plug returns to its initial state. do. By the way, a voltage equal to the discharge voltage of the spark plugs P1 to P4 is applied in the opposite direction to the high voltage diodes D1 to D4 during operation of the engine. for example,
At the ignition timing of the first cylinder, that is, at time T2, the discharge voltage of the spark plug P4 is applied to the high voltage diode D4 in the opposite direction. The discharge voltage of this spark plug varies depending on the operating conditions and engine, but in high cases it is around 30KV. Therefore, the reverse withstand voltage of the high voltage diodes D1 to D4 is required to be 30 KV or more. The high voltage diodes D1 to D4 have a structure as shown in FIG. 3 in order to obtain the above-mentioned reverse withstand voltage. That is, about 20 to 30 silicon pellets 101 having a reverse dielectric strength of about 1.5 KV are stacked, and electrodes 102 and lead wires 103 are connected to both ends of the stack.
are attached, and these are integrally molded with a glass mold 104. Next, a high voltage diode D1 having the above structure is
The voltage applied to each silicon pellet 101 will be explained, assuming that the reverse voltage applied to D4 to D4 is Eo. When the frequency of the applied voltage is low, the voltage is distributed evenly to each silicon pellet 101. For example, the number of silicon pellets is n
Then, the voltage Eo1 applied to each silicon pellet 101 becomes =Eo/n. However, in an ignition system, when a spark discharge is generated by a spark plug,
A high frequency voltage with a rise time of about 10 nS is applied to the high voltage diodes D1 to D4. Therefore, the voltage applied to each silicon pellet 101 is not equal, and a phenomenon occurs in which the voltage is concentratedly applied to the silicon pellet 101 connected to the spark plugs P1 to P4. Therefore, these silicon pellets 101 have the above-mentioned Eo 1 =Eo/n
A voltage that is significantly larger than that applied is applied. As a result, even if the number of laminated silicon pellets 101 is increased, the actual reverse withstand voltage cannot be significantly increased when used in a spark plug. Therefore, in order to put into practical use an ignition system for an internal combustion engine in which ignition energy is distributed by high-voltage diodes having the above structure and distributed to a plurality of spark plugs, the above-mentioned drawbacks must be solved. That is, there is a demand for the development of a high voltage diode and its mounting method that can ensure a reverse withstand voltage of 30 KV or more even against the high frequency voltage generated when a spark discharge is generated by a spark plug. SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, an object of the present invention is to provide an ignition device for an internal combustion engine that is compact and has excellent withstand voltage performance, which equalizes and shares the voltage applied to the silicon pellets constituting the high-voltage diode. The above object of the present invention is to provide a conductive electrode close to the side of the silicon pellet constituting the high voltage diode that is connected to the spark plug, and to connect this electrode to the output side of the high voltage diode that is connected to the spark plug. This is achieved by increasing the distributed capacitance of the silicon pellet by setting it at the same potential as the end, thereby alleviating voltage concentration when high frequency voltage is applied. Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a sectional view showing an embodiment of an ignition device for an internal combustion engine according to the present invention. However, similar or identical components to those in FIG. 1 are indicated using the same reference numerals. Primary coils 2 and 3 are wound around the bobbin 12, and the beginning of the winding of the primary coil 2 is connected to the primary terminal 13, and the end of the winding of the primary coil 3 is connected to the primary terminal 13.
4, and the end of the primary coil 3 is connected to the primary terminal 15.
It is connected to the. On the other hand, the secondary coil 9 is housed in a case 16 made of synthetic resin, and the primary coils 2, 3
attached to the outer periphery of the This secondary coil 9 is 2
After being laminated and wound around two bobbins 17, they are connected in series and housed in the case 16. The winding ends 10 and 11 of the secondary coil 9 are connected to the case 1.
6 are connected to secondary terminals 18 and 19, respectively. Further, the bobbin 12 around which the primary coils 2 and 3 are wound is inserted into the center hole of the case 16 housing the secondary coil 9, and then impregnated with an epoxy resin composition 20 in a vacuum and cured by heating. There is. An L-shaped core 21 made of laminated silicon steel plates is inserted into the center hole of the bobbin 12 around which the primary coils 2 and 3 are wound, and combined with the core 22 surrounding the case 16, a set of closed magnetic circuit iron cores is formed. ing. The high-voltage diodes D1 to D4 are the same as those shown in FIG. 3, and are housed in a case 23 made of synthetic resin.
High voltage terminals 24, 25, 26, integrally molded with
27, respectively. Further, the other ends of the high voltage diodes D1 and D2 are connected to the diode terminals 28 attached to the case 23.
The other ends of 3 and D4 are similarly connected to the diode terminal 29. After injecting the epoxy resin composition 20 into this case 23, it is heated and cured to form a high-voltage diode portion. Furthermore, the diode terminals 28 and 29 are connected to the secondary terminals 18 and 19, and all the above components are integrally covered with a synthetic resin 30 to form the ignition coil 1. FIG. 5 is a diagram showing details of the mounting portion of the high voltage diode shown in FIG. 4, and is a characteristic portion of this embodiment. That is, the high voltage terminal 24 (high voltage terminal 25,
26 and 27) is the high voltage diode D1 (D
2, D3, and D4) glass mold 104
The cap-shaped portion (conductive electrode) 105 has an inner diameter approximately 2 mm larger than the outer diameter of the cap. A part of the high-voltage diode D1 connected to the high-voltage terminal 24 is attached so that about 30% of its total length is inserted into the above-described shaded part 105. Note that the same applies to the other high voltage diodes D2 to D4. As shown in Fig. 5, high voltage diodes D1 to D
4, the cap-shaped part 105 of the high voltage terminal and
The distributed capacitance between the high voltage diode and the silicon pellet 101 on the side closer to the high voltage terminals 24 to 27 becomes large. Due to this increase in distributed capacitance, when the high frequency voltage generated when spark discharge is generated by the spark plugs P1 to P4 is applied to the high voltage diodes D1 to D4, the silicon pellet 101 on the side closer to the high voltage terminals 24 to 27 It is possible to prevent voltage from concentrating on the Next, the above voltage concentration prevention effect will be explained. When a voltage with a rise time of about 10 ns is applied to the high-voltage diodes D1 to D4 (hereinafter referred to as D1), when considering the voltage shared by each silicon pellet 101, it is assumed that the voltage between the silicon pellet 101 and the high-voltage terminal 24 is static. It can be considered equivalent to capacitance. With this way of thinking, the rise time
The voltage applied to each silicon pellet 101 when a 10 nS steep wave voltage is applied to the high voltage diode D1 is calculated as shown in FIG. 6. In the example shown in Fig. 6, silicon pellets 101 are
The horizontal axis shows the number of silicon pellets, the left side of the figure shows the spark plug side, the right side shows the secondary coil side, and the vertical axis shows the number of silicon pellets. Indicates the voltage sharing ratio of
【表】
従来技術により取付けた高圧ダイオードは非常に
短時間で破壊するのに対し本実施例の方法で取付
けた高圧ダイオードは十分な耐電圧性能を有して
いることが分る。
本実施例によれば高圧ダイオードＤ１〜Ｄ４
（以下Ｄ１で代表する）をシリコンペレツト１０
１の高圧端子２４側が高圧端子２４に形成されて
いる笠状部分１０５の中に入るように取付けるこ
とによにり、、ガラスモールド１０４内のシリコ
ンペレツト１０１の分布容量を大きくして、高圧
端子２４側に位置するシリコンペレツト１０１へ
高電圧が集中することを防止する効果があり、高
圧ダイオードＤ１の耐電圧性能を飛躍的に向上さ
せる効果がある。従つて、シリコンペレツトを多
数積層した高圧ダイオードを用いることなく内燃
機関用点火装置を小形で且つ耐電圧性能の優れた
ものとする効果がある。
第７図は本発明に係る内燃機関用点火装置の他
の実施例の要部である高圧ダイオードの構造を示
すものである。但し第３図と同様あるいは同一構
成部分は同一符号を用いて示してある。本実施例
の高圧ダイオードでは、ガラスモールド１０４内
の１つの電極１０２に導電材から成る笠状部分１
０６を設け、この笠状部分により包囲されるペレ
ツト１０１の分布容量を大きくしてある。
この実施例ではガラスモールド１０４内に笠状
部分１０６を設けてあるため、高圧ダイオードを
点火プラグ側の高圧端子に取付ける際に、高圧端
子側に笠状部分を設ける必要がなくなり、従来か
らの高圧端子にそのまま本実施例の高圧ダイオー
ドを取付けて、先きの実施例と同様の効果を得る
ことができる。
以上の説明から明らかなように本発明によれ
ば、高圧ダイオードを構成するシリコンペレツト
の点火プラグに接続される側のシリコンペレツト
に近接して高圧ダイオードの出力端と同電位とな
る導電性の電極を設けることにより、高圧ダイオ
ードを構成するシリコンペレツトに加わる電圧を
均一化して分担させた小形で耐電圧性能の優れた
内燃機関用点火装置を提供することができる。[Table] It can be seen that the high voltage diode installed using the conventional technique breaks down in a very short time, whereas the high voltage diode installed using the method of this embodiment has sufficient withstand voltage performance. According to this embodiment, the high voltage diodes D1 to D4
(hereinafter referred to as D1) is silicon pellet 10
By installing the high-voltage terminal 24 side of the first high-voltage terminal 24 into the cap-shaped part 105 formed on the high-voltage terminal 24, the distributed capacity of the silicon pellet 101 within the glass mold 104 is increased, and the high-voltage terminal 24 is This has the effect of preventing high voltage from concentrating on the silicon pellet 101 located on the terminal 24 side, and has the effect of dramatically improving the withstand voltage performance of the high voltage diode D1. Therefore, the ignition device for an internal combustion engine can be made compact and have excellent withstand voltage performance without using a high-voltage diode made of a large number of laminated silicon pellets. FIG. 7 shows the structure of a high voltage diode which is a main part of another embodiment of the ignition device for an internal combustion engine according to the present invention. However, similar or identical components to those in FIG. 3 are indicated using the same reference numerals. In the high voltage diode of this embodiment, one electrode 102 in a glass mold 104 is provided with a cap-shaped portion 1 made of a conductive material.
06 is provided to increase the distribution capacity of the pellets 101 surrounded by this cap-shaped portion. In this embodiment, a cap-shaped portion 106 is provided inside the glass mold 104, so when attaching a high-voltage diode to the high-voltage terminal on the spark plug side, there is no need to provide a cap-shaped portion on the high-voltage terminal side. By attaching the high voltage diode of this embodiment to the terminal as is, the same effects as in the previous embodiment can be obtained. As is clear from the above description, according to the present invention, the conductive material that is located close to the silicon pellet on the side connected to the spark plug of the silicon pellet constituting the high voltage diode has the same potential as the output end of the high voltage diode. By providing the electrodes, it is possible to provide an ignition device for an internal combustion engine that is compact and has excellent withstand voltage performance, which equalizes and shares the voltage applied to the silicon pellets constituting the high-voltage diode.
第１図は従来の自動車用４気筒エンジンに使用
される点火系回路図、第２図は第１図の点火系回
路の動作を説明するタイムチヤート図、第３図は
従来の高圧ダイオードの構造を示す概略断面図、
第４図は本発明に係る内燃機関用点火装置の一実
施例を示した断面図、第５図は第４図の高圧端子
に取付けられている高圧ダイオードの取付構造を
示した詳細図、第６図は従来と本実施例の高圧ダ
イオードを構成する各シリコンペレツトの電圧分
担率を示した比較線図、第７図は本発明に係る内
燃機関用点火装置の一実施例の要部である高圧ダ
イオードの構造を示した概略断面図である。
１……点火コイル、２，３……一次コイル、９
……二次コイル、２４，２５，２６，２７……高
圧端子、１０１……シリコンペレツト、１０２…
…電極、１０３……リード線、１０４……ガラス
モールド、１０５，１０６……笠状部分、Ｄ１，
Ｄ２，Ｄ３，Ｄ４……高圧ダイオード、Ｐ１，Ｐ
２，Ｐ３，Ｐ４……点火プラグ。
Figure 1 is an ignition system circuit diagram used in a conventional four-cylinder automobile engine, Figure 2 is a time chart explaining the operation of the ignition system circuit in Figure 1, and Figure 3 is the structure of a conventional high-pressure diode. A schematic cross-sectional view showing
FIG. 4 is a sectional view showing an embodiment of the ignition device for an internal combustion engine according to the present invention, FIG. 5 is a detailed view showing the mounting structure of the high voltage diode attached to the high voltage terminal of FIG. Fig. 6 is a comparison diagram showing the voltage sharing ratio of each silicon pellet constituting the high voltage diode of the conventional and this embodiment, and Fig. 7 shows the main part of an embodiment of the ignition device for an internal combustion engine according to the present invention. 1 is a schematic cross-sectional view showing the structure of a certain high voltage diode. 1...Ignition coil, 2, 3...Primary coil, 9
... Secondary coil, 24, 25, 26, 27 ... High voltage terminal, 101 ... Silicon pellet, 102 ...
... Electrode, 103 ... Lead wire, 104 ... Glass mold, 105, 106 ... Cap-shaped part, D1,
D2, D3, D4...High voltage diode, P1, P
2, P3, P4...Spark plug.
Claims (1)
レツトを複数個積層して成る高圧ダイオードを介
して点火プラグに配電する内燃機関用点火装置に
おいて、前記高圧ダイオードの点火プラグに接続
される側の出力端と同電位となる導電性電極を、
前記高圧ダイオードを構成する半導体ペレツトに
近接して設け、該導電性電極と半導体ペレツト間
に浮遊容量を形成させたことを特徴とする内燃機
関用点火装置。 ２ 高圧ダイオードの点火プラグに接続される側
の端部を一部包囲するような笠状に広がる形状の
導電性電極を、点火プラグに接続され且つ前記高
圧ダイオードの一端子が接続される高圧端子部に
設けたことを特徴とする特許請求の範囲第１項記
載の内燃機関用点火装置。 ３ 高圧ダイオードを構成する前記積層された半
導体ペレツトの一端部に取付けられたリード電極
に、前記半導体ペレツトの該リード電極側の一部
を包囲するような導電性電極を設け、該導電性電
極を前記半導体ペレツト及びリード電極と共にガ
ラスモールドで一体に被覆したことを特徴とする
特許請求の範囲第１項記載の内燃機関用点火装
置。[Scope of Claims] 1. An ignition device for an internal combustion engine that distributes high voltage supplied from an ignition coil to a spark plug via a high-voltage diode formed by laminating a plurality of semiconductor pellets, which is connected to the spark plug of the high-voltage diode. A conductive electrode that has the same potential as the output end on the side to be
An ignition device for an internal combustion engine, characterized in that the ignition device is provided close to a semiconductor pellet constituting the high voltage diode, and a stray capacitance is formed between the conductive electrode and the semiconductor pellet. 2. A high voltage terminal connected to the spark plug and to which one terminal of the high voltage diode is connected, a conductive electrode having a shape that spreads out in a cap shape so as to partially surround the end of the high voltage diode on the side connected to the spark plug. An ignition device for an internal combustion engine according to claim 1, characterized in that the ignition device is provided in a portion of the ignition device. 3. A conductive electrode is provided on a lead electrode attached to one end of the stacked semiconductor pellets constituting the high voltage diode so as to surround a part of the semiconductor pellet on the lead electrode side, and the conductive electrode is 2. The ignition device for an internal combustion engine according to claim 1, wherein the semiconductor pellet and the lead electrode are integrally covered with a glass mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7358481A JPS57188773A (en) | 1981-05-18 | 1981-05-18 | Ignition device of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7358481A JPS57188773A (en) | 1981-05-18 | 1981-05-18 | Ignition device of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57188773A JPS57188773A (en) | 1982-11-19 |
| JPS641665B2 true JPS641665B2 (en) | 1989-01-12 |
Family
ID=13522495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7358481A Granted JPS57188773A (en) | 1981-05-18 | 1981-05-18 | Ignition device of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57188773A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59144171U (en) * | 1983-03-17 | 1984-09-26 | 富士電機株式会社 | engine ignition circuit |
| JPS6079171A (en) * | 1983-10-06 | 1985-05-04 | Fuji Electric Co Ltd | Distributorless type igniter |
-
1981
- 1981-05-18 JP JP7358481A patent/JPS57188773A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57188773A (en) | 1982-11-19 |
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