JPS61178561A - Ignitor for internal-combustion engine - Google Patents
Ignitor for internal-combustion engineInfo
- Publication number
- JPS61178561A JPS61178561A JP2048485A JP2048485A JPS61178561A JP S61178561 A JPS61178561 A JP S61178561A JP 2048485 A JP2048485 A JP 2048485A JP 2048485 A JP2048485 A JP 2048485A JP S61178561 A JPS61178561 A JP S61178561A
- Authority
- JP
- Japan
- Prior art keywords
- spark plug
- voltage
- discharge
- constant voltage
- combustion engine
- 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.)
- Granted
Links
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
- F02P9/00—Electric spark ignition control, not otherwise provided for
- F02P9/002—Control of spark intensity, intensifying, lengthening, suppression
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)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は内燃機関の点火装置に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an ignition device for an internal combustion engine.
最近の点火プラグの放電電圧は、内燃機関の高圧縮比化
、ターボチャージャーの採用等による圧縮圧力増大のた
め、高電圧化している。それに伴い、点火装置各部は、
耐電圧向上を図るため、大型化、重量化を余儀なくされ
ており、自動車の小型、軽量化という時代の趨勢に、逆
行した動きとなっている。このような背景から、点火プ
ラグの低電圧化に対する強い社会的ニードがある。Recently, the discharge voltage of spark plugs has become higher due to increased compression pressure due to higher compression ratios of internal combustion engines, adoption of turbochargers, etc. Along with this, each part of the ignition system,
In order to improve voltage resistance, they have been forced to become larger and heavier, a move that runs counter to the current trend of making automobiles smaller and lighter. Against this background, there is a strong social need for lower voltage spark plugs.
点火プラグの放電現象は、まず大気中に存在する電子が
、点火プラグギャップ間の高電界で加速され、間囲の空
気分子を破壊し、なだれを起こすことによって生起する
と考えられている。ところで、この放電の引き金となる
大気中の電子は、非常に希薄であるため、常にギャップ
間の放電しやすい位置に存在するとは限らず、このこと
が見掛は上、放電電圧をばらつかせている。The spark plug discharge phenomenon is thought to occur when electrons present in the atmosphere are accelerated by the high electric field between the spark plug gaps, destroy surrounding air molecules, and cause an avalanche. By the way, the electrons in the atmosphere that trigger this discharge are extremely rare, so they are not always present in the position between the gaps where it is easy to discharge. ing.
また従来、点火コイルの２次側と接地間に定電圧素子を
接続して、配電器内の異常放電を防止するものがある（
例えば、日本電装公開技報 整理番号３２−０４８およ
び３２−０４９．１９８３年１０月２０日発行）。In addition, conventionally, a constant voltage element is connected between the secondary side of the ignition coil and the ground to prevent abnormal discharge in the power distribution device.
For example, Nippon Denso Technical Report Reference Numbers 32-048 and 32-049, published October 20, 1983).
ところが、上述した従来のものでは、定電圧素子は配電
器内の異常放電を防止するためのものであるので、その
設定電圧は、異常放電の放電電圧の下限値と配電器及び
点火プラグの放電電圧の和のばらつきの上限値との間に
設定されており、点火プラグの放電電圧のばらつきは何
ら抑えることはできなかった。However, in the conventional device described above, the constant voltage element is used to prevent abnormal discharge within the power distributor, so the set voltage is determined by the lower limit of the discharge voltage for abnormal discharge and the discharge of the power distributor and spark plug. It was set between the upper limit of the variation in the sum of the voltages, and the variation in the discharge voltage of the spark plug could not be suppressed at all.
そこで、本発明は、見掛は上の放電電圧のばらつきを抑
えて、点火プラグの放電電圧を低く抑えるものである。Therefore, the present invention suppresses the apparent dispersion of the discharge voltage and suppresses the discharge voltage of the spark plug to a low level.
そのため本発明は、点火プラグの放電電圧のばらつきの
範囲内に設定電圧を持つ定電圧素子を点火プラグと並列
接続したものである。Therefore, in the present invention, a constant voltage element having a set voltage within the range of variations in discharge voltage of the spark plug is connected in parallel with the spark plug.
これにより、点火プラグに印加される電圧は定電圧素子
により放電電圧のばらつきの範囲内の設定値に抑制され
てこの状態で待機し、放電の条件がそろったところで放
電する。As a result, the voltage applied to the spark plug is suppressed by the constant voltage element to a set value within the range of dispersion of the discharge voltage, and the spark plug waits in this state, and discharges when the discharge conditions are met.
以下本発明を図に示す実施例について説明する。 The present invention will be described below with reference to embodiments shown in the drawings.
第１図において、■は図示しない内燃機関に取り付けら
れる一般的な点火プラグ、２はある一定電圧（例えば−
２２ＫＶ〜−２３ＫＶ）で抵抗が０となるバリスタ、ア
バランシュダイオードのような定電圧素子、３は内燃機
関の回転に同期して５のパワートランジスタにオン、オ
フ信号を送るイグナイタ、５はイグナイタ３よりのオン
、オフ信号に応じて点火コイル４の１次側の電流をオン
、オフするパワートランジスタである。なお、第１図に
は図示していないが、内燃機関が多気筒の場合は点火コ
イル４の２次側の定電圧素子２と各点火プラグ１との間
（第１図６の位置）に配電器が入る。In Fig. 1, ■ is a general spark plug attached to an internal combustion engine (not shown), and 2 is a certain voltage (for example -
A constant voltage element such as a varistor or avalanche diode whose resistance becomes 0 at 22KV to -23KV), 3 is an igniter that sends an on/off signal to the power transistor 5 in synchronization with the rotation of the internal combustion engine, 5 is from igniter 3 This is a power transistor that turns on and off the primary side current of the ignition coil 4 according to the on and off signals of the ignition coil 4. Although not shown in FIG. 1, if the internal combustion engine is a multi-cylinder engine, there is a A power distributor enters.
点火プラグの放電現象は、まず待機中に存在する電子が
、点火プラグギャップ間の高電界で加速され、周囲の空
気分子を破壊し、なだれを起こすことによって生起する
。ところが、この放電の引き金となる大気中の電子は、
非常に希薄であるため、点火プラグ１のような不均等電
界では、常に点火プラグｌのギャップ間の放電しやすい
位置に存在するとは限らず、点火コイル４の発生電圧の
ように一定の割合で上昇する電圧を印加する場合には放
電電圧がばらつくことになる。本実施例は設定電圧をこ
のばらつきの範囲内（配電器を有する場合には、配電器
及び点火プラグ１の放電電圧の和のばらつきの範囲内）
とした定電圧素子２を点火プラグｌと並列に挿入し、点
火プラグ１に印加される電圧を第２図の実線に示すよう
にある一定レベルでフラットにする。点火プラグ１の電
圧印加波形をこうすることにより、印加電圧が立ち上が
った直後には放電のための条件がそろわないが、それか
られずかに時間経過した後には、空気中の電子が熱運動
により移動し、放電しやすい領域、つまり点火プラグｌ
の電極のエツジ付近に入り、放電のための条件がそろい
放電が生起する。The spark plug discharge phenomenon occurs when electrons that are waiting are accelerated by the high electric field between the spark plug gaps, destroy surrounding air molecules, and cause an avalanche. However, the electrons in the atmosphere that trigger this discharge are
Because it is very dilute, in an uneven electric field like the one in the spark plug 1, it does not always exist in a position where it is easy to discharge between the gaps of the spark plug l, and the voltage generated in the ignition coil 4 does not always exist at a position where it is easy to discharge. When a rising voltage is applied, the discharge voltage will vary. In this embodiment, the set voltage is within this range of variation (if a power distribution device is provided, within the range of variation in the sum of the discharge voltages of the power distribution device and the spark plug 1).
A constant voltage element 2 is inserted in parallel with the spark plug 1, and the voltage applied to the spark plug 1 is flattened at a certain level as shown by the solid line in FIG. By setting the voltage application waveform of the spark plug 1 in this way, the conditions for discharge are not met immediately after the applied voltage rises, but after a short period of time, electrons in the air move due to thermal movement. However, the area where discharge is likely to occur, that is, the spark plug
The discharge occurs near the edge of the electrode, and the conditions for discharge are met.
この場合、定電圧素子２がないと放電波形は第２図の破
線のようになると考えられるため、定電圧素子を挿入し
ない場合に比べ高い電圧で放電することになる。第２図
の実線は実験結果であ、る。In this case, without the constant voltage element 2, the discharge waveform would be as shown by the broken line in FIG. 2, so that the discharge would occur at a higher voltage than in the case where the constant voltage element was not inserted. The solid line in FIG. 2 is the experimental result.
ところで、点火プラグ１と並列に定電圧素子２を挿入す
ることにより、点火プラグｌの印加電圧が設定電圧を越
す場合、点火コイル４のエネルギーがそちらに流れてし
まい、点火プラグ１に充分なエネルギーがいかない懸命
があるが、実際には点火コイル４のインダクタンスのた
め、点火コイル４の発生電圧が定電圧素子２の設定電圧
を超えるとすぐに定電圧素子２に点火コイル４のエネル
ギーが流れるわけではなく、点火プラグ１への電圧印加
からそのギャップ間での放電までの時間がかなり長くな
る場合を除き、大部分のエネルギーは点火コイル４にた
くわえられたまま、点火プラグ１のギャップ間での放電
と同時にそのギヤ・７プ間に供給され、定電圧素子２が
ない場合と比べ放電エネルギーはほとんど変化しない。By the way, by inserting a constant voltage element 2 in parallel with the spark plug 1, if the applied voltage of the spark plug l exceeds the set voltage, the energy of the ignition coil 4 will flow there, and the spark plug 1 will not have enough energy. However, due to the inductance of the ignition coil 4, as soon as the voltage generated by the ignition coil 4 exceeds the set voltage of the constant voltage element 2, the energy of the ignition coil 4 flows to the constant voltage element 2. Rather, most of the energy remains stored in the ignition coil 4 and is discharged across the gap of the spark plug 1, unless the time from application of voltage to the spark plug 1 to discharge across the gap is quite long. Simultaneously with the discharge, the discharge energy is supplied between the gears 7 and 7, and the discharge energy hardly changes compared to the case without the constant voltage element 2.
第３図は定電圧素子２を用いた場合と用いない場合との
点火プラグｌの放電電圧を比較した一実施例である。左
半分が定電圧素子２を用いた場合、右半分が定電圧素子
２を用いない場合であるが、定電圧素子２を用いた場合
には、その設定電圧以上で放電が起こっていないのに対
し、定電圧素子２を用いない場合にはそれより高い重用
で放電が起こっており、定電圧素子２を用いることによ
り放電電圧の低減がなっていることがわかる。FIG. 3 is an example in which the discharge voltage of the spark plug 1 is compared between when the constant voltage element 2 is used and when the constant voltage element 2 is not used. The left half is when constant voltage element 2 is used, and the right half is when constant voltage element 2 is not used, but when constant voltage element 2 is used, even though no discharge occurs above the set voltage. On the other hand, when the constant voltage element 2 is not used, discharge occurs at a higher duty than that, and it can be seen that the discharge voltage is reduced by using the constant voltage element 2.
なお、定電圧素子２としてバリスタを用いた場合には、
これはセラミックであるので、第４図に示す如（点火プ
ラグ１のアルミナ碍子１ａと一体に成形してもよい。こ
の場合、定電圧素子２は各点火プラグ１ごとに並列に挿
入されることになる。Note that when a varistor is used as the constant voltage element 2,
Since this is ceramic, it may be molded integrally with the alumina insulator 1a of the spark plug 1 as shown in FIG. become.
第４図において、１ｂは点火プラグ１の中心電極、１ｃ
は点火プラグ１の接地電極であって、接地側ハウジング
１ｄに固着されている。また、バリスタよりなる定電圧
素子２は碍子１ａの中間部分において、中心電極１ｂと
接地側ハウジング１ｄとの間に配置されている。In FIG. 4, 1b is the center electrode of the spark plug 1, 1c
is a ground electrode of the spark plug 1, which is fixed to the ground side housing 1d. Further, a constant voltage element 2 made of a varistor is arranged in the middle portion of the insulator 1a between the center electrode 1b and the ground side housing 1d.
以上述べたように本発明においては、点火プラグに印加
される電圧が、定電圧素子により放電電圧のばらつきの
範囲内の設定値に抑制されてこの状態で待機し、放電の
条件がそろったところで放電するから、見掛は上の放電
電圧のばらつきを抑えて、点火プラグの放電電圧を低く
抑えることができるという優れた効果がある。As described above, in the present invention, the voltage applied to the spark plug is suppressed by the constant voltage element to a set value within the range of dispersion of the discharge voltage, and waits in this state, and when the discharge conditions are met, Since the spark plug discharges, it has the excellent effect of suppressing the apparent dispersion of the discharge voltage and keeping the discharge voltage of the spark plug low.
第１図は本発明装置の一実施例を示す電気回路図、第２
図は上記実施例における点火プラグの印加電圧波形図、
第３図は定電圧素子の有無による点火プラグの放電電圧
の実験例を示す波形図、第４図は本発明装置の他の実施
例における点火プラグを示す半断面正面図である。
１・・・点火プラグ、１ａ・・・アルミナ碍子、■ｂ・
・・中心電極、１ｄ・・・接地側ハウジング、２・・・
定電圧素子、４・・・点火コイル。FIG. 1 is an electric circuit diagram showing one embodiment of the device of the present invention, and FIG.
The figure is a diagram of the applied voltage waveform of the spark plug in the above embodiment,
FIG. 3 is a waveform diagram showing an experimental example of discharge voltage of a spark plug with and without a constant voltage element, and FIG. 4 is a half-sectional front view showing a spark plug in another embodiment of the device of the present invention. 1... Spark plug, 1a... Alumina insulator, ■b.
...Center electrode, 1d...Ground side housing, 2...
Constant voltage element, 4...Ignition coil.
Claims (3)
電圧を持つ定電圧素子を点火プラグと並列接続した内燃
機関の点火装置。(1) An ignition system for an internal combustion engine in which a constant voltage element having a set voltage within the range of variations in discharge voltage of the spark plug is connected in parallel with the spark plug.
接地側ハウジングとの間に、碍子と一体成形して挿入し
たバリスタよりなる特許請求の範囲第１項記載の内燃機
関の点火装置。(2) The ignition device for an internal combustion engine according to claim 1, wherein the constant voltage element is a varistor that is integrally molded with an insulator and inserted between the center electrode of the spark plug and the ground side housing.
続した内燃機関の点火装置において、前記配電器及び前
記点火プラグの放電電圧の和のばらつきの範囲内に設定
電圧を持つ定電圧素子を、前記点火コイルの高圧側と接
地との間に接続した内燃機関の点火装置。(3) In an ignition system for an internal combustion engine in which each spark plug is connected to an ignition coil via a power distribution device, a constant voltage element having a set voltage within the range of variation in the sum of the discharge voltages of the power distribution device and the spark plug is provided. , an ignition system for an internal combustion engine connected between the high voltage side of the ignition coil and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60020484A JPH0680313B2 (en) | 1985-02-04 | 1985-02-04 | Internal combustion engine ignition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60020484A JPH0680313B2 (en) | 1985-02-04 | 1985-02-04 | Internal combustion engine ignition device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61178561A true JPS61178561A (en) | 1986-08-11 |
| JPH0680313B2 JPH0680313B2 (en) | 1994-10-12 |
Family
ID=12028403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60020484A Expired - Fee Related JPH0680313B2 (en) | 1985-02-04 | 1985-02-04 | Internal combustion engine ignition device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0680313B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140034967A1 (en) * | 2012-08-06 | 2014-02-06 | Denso Corporation | Diode |
| US9022010B2 (en) | 2012-02-08 | 2015-05-05 | Denso Corporation | Ignition system |
| US9127638B2 (en) | 2012-02-08 | 2015-09-08 | Denso Corporation | Control apparatus for internal combustion engine |
| US9702332B2 (en) | 2012-11-02 | 2017-07-11 | Denso Corporation | Ignition device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5794165B2 (en) * | 2012-02-08 | 2015-10-14 | 株式会社デンソー | Ignition device |
| JP5794214B2 (en) * | 2012-02-08 | 2015-10-14 | 株式会社デンソー | Control device for internal combustion engine |
| US9488151B2 (en) * | 2012-02-08 | 2016-11-08 | Denso Corporation | Ignition system |
| JP5900383B2 (en) * | 2013-03-08 | 2016-04-06 | 株式会社デンソー | Ignition device |
| JP5900418B2 (en) * | 2013-06-10 | 2016-04-06 | 株式会社デンソー | Spark plug for internal combustion engine |
| JP5907149B2 (en) | 2013-11-28 | 2016-04-20 | 株式会社デンソー | Control device for internal combustion engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60129091U (en) * | 1984-02-08 | 1985-08-29 | 三菱電機株式会社 | internal combustion engine ignition system |
-
1985
- 1985-02-04 JP JP60020484A patent/JPH0680313B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60129091U (en) * | 1984-02-08 | 1985-08-29 | 三菱電機株式会社 | internal combustion engine ignition system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9022010B2 (en) | 2012-02-08 | 2015-05-05 | Denso Corporation | Ignition system |
| US9127638B2 (en) | 2012-02-08 | 2015-09-08 | Denso Corporation | Control apparatus for internal combustion engine |
| US20140034967A1 (en) * | 2012-08-06 | 2014-02-06 | Denso Corporation | Diode |
| US9478672B2 (en) * | 2012-08-06 | 2016-10-25 | Denso Corporation | Diode |
| US9702332B2 (en) | 2012-11-02 | 2017-07-11 | Denso Corporation | Ignition device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0680313B2 (en) | 1994-10-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |