JPS62234887A - Contamination-proof burning sensor - Google Patents
Contamination-proof burning sensorInfo
- Publication number
- JPS62234887A JPS62234887A JP7655986A JP7655986A JPS62234887A JP S62234887 A JPS62234887 A JP S62234887A JP 7655986 A JP7655986 A JP 7655986A JP 7655986 A JP7655986 A JP 7655986A JP S62234887 A JPS62234887 A JP S62234887A
- Authority
- JP
- Japan
- Prior art keywords
- window
- combustion
- spark plug
- spark
- discharge
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 claims description 25
- 230000003287 optical effect Effects 0.000 claims 1
- 239000011800 void material Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000003365 glass fiber Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 235000006693 Cassia laevigata Nutrition 0.000 description 1
- 241000735631 Senna pendula Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229940124513 senna glycoside Drugs 0.000 description 1
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
- Spark Plugs (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
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燃焼火炎光の検出装置に係り、特に
上記検出装置を実装した場合の経時変化対策に係るもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a detection device for combustion flame light of an internal combustion engine, and particularly to countermeasures against changes over time when the above detection device is installed.
内燃機関の燃焼火炎光を外部に導出して利用するという
試みは各方面で検討されている。この場合、耐熱性の高
い光導体１例えば石英ガラスミツド等３燃焼室壁に開口
する形で投書するため、その先端部の燃焼火炎と接する
面がカーボア、オイルミスト等により汚損され、燃焼光
の透光性が低下するという問題があった。この解決手段
として特開昭５７−１６３８４２では、光導体の先端を
きのこ状にして燃焼室内に突き出し、その表面を混合気
流によって清浄させ１京らにきのこ状光導体中心部に中
央電極を設けて点火プラグとし、放電゛、火・元をきの
こ状の表面を沿面放電させることにより汚れをとること
が提案されている。Attempts to extract and utilize the combustion flame light from an internal combustion engine to the outside are being considered in various fields. In this case, since the highly heat-resistant light guide 1, such as quartz glass mid 3, is posted in the form of an opening on the combustion chamber wall, the surface in contact with the combustion flame at its tip is contaminated with carbore, oil mist, etc., and the combustion light is transmitted through the light guide. There was a problem that the luminosity decreased. As a solution to this problem, Japanese Patent Application Laid-Open No. 57-163842 proposes a method in which the tip of the light guide is made into a mushroom shape, protrudes into the combustion chamber, its surface is cleaned by the air mixture, and a central electrode is provided at the center of the mushroom-shaped light guide. It has been proposed to use a spark plug to remove dirt by causing a creeping discharge on the mushroom-shaped surface of the spark plug.
しかし、上記のごとき方法の場合、構造、構成が複雑で
実用性に難点がある。However, in the case of the above-mentioned method, the structure and composition are complicated and there are problems in practicality.
本発明の目的とするところは、前記した燃焼火炎光検出
のための窓部の汚れの影響を回避する実用的、かつ、普
偏的な解決手段を提示することにある。An object of the present invention is to provide a practical and universal solution for avoiding the influence of dirt on the window for detecting combustion flame light.
特に点火プラグと一体となった燃焼光検出装置の先導体
窓部の汚れを積極的にとり去る手段を提示することにあ
る。In particular, it is an object of the present invention to provide a means for actively removing dirt from a guide window of a combustion light detection device integrated with a spark plug.
上記目的は光導体の燃焼室側端部を点火プラグの中心電
極と外側電極で形成τる火花放電ギャップの仝隙部まで
突き出すように構成することによって達成される。This object is achieved by configuring the light guide so that its end on the side of the combustion chamber projects into the gap of the spark discharge gap formed by the center electrode and the outer electrode of the spark plug.
上記窓部に付着している成分を分析すると大半はカーボ
ンである。この付着カーボンＨ３Ｏ０〜６００Ｃ以上に
加熱すると燃えてなくなることが知られている。点火プ
ラグの電極間の放電火花は１０００〜２０００Ｃ程度ま
で瞬時的ＶＣ達するので。Analysis of the components adhering to the window section reveals that most of the components are carbon. It is known that if this attached carbon H3O is heated to 0 to 600C or higher, it will burn out. The discharge spark between the electrodes of a spark plug reaches an instantaneous VC of about 1000 to 2000C.
この放電火花を利用して付着カーボアを焼失させること
が９距である。The ninth point is to use this discharge spark to burn off the attached carbore.
前記窓部にカーボンが付着し、その表面に混合気が滞留
すると、付着カーボン部の絶縁抵抗は層端に小きくなる
。したがって、点火プラグの両′電極間に前記カーボン
で汚損した窓部を突き出すと。When carbon adheres to the window portion and air-fuel mixture stagnates on its surface, the insulation resistance of the carbon-adhered portion becomes smaller at the layer edges. Therefore, when the carbon-stained window is protruded between both electrodes of the spark plug.
この窓部表面のカーボン部ｖｃａって火花が放電するこ
とになる。放電火花は窓部の一部のみを導路として放電
し、その部分のカーボンを焼き切るが。Sparks are discharged from the carbon portion vca on the surface of the window. The spark discharges only a part of the window as a conductor and burns off the carbon in that part.
次の火花放電では、また次の汚れている所を放電し、ラ
ンダムにしかも順次最も絶縁抵抗の小さいところ、すな
わち最も汚れているところご放電し自己清浄性を得るこ
とができる。In the next spark discharge, the next dirty spot is discharged, and the discharge is made randomly and sequentially to the spot with the lowest insulation resistance, that is, the spot that is the dirtiest, thereby achieving self-cleaning.
ｗＪ２図（ａ）、 （ｂ）Ｉｒｉ当方でこれまで検討し
てきた点火プラグ一体型燃焼センナの先導体窓部付近の
要部断面図である。光導体１は耐熱性に優れた石英ガラ
スファイバであり、点火プラグの中心電極２の中心軸部
を貫通ずる形で配設しである。点火プラグとしての火花
放電は、この中心電極２と外側電極３との微少ギャップ
間で行われる。第２図（ａ）の場合、８３部で、＠２図
（ｂ）の場合ｓｂ部で火花放・厄が行われる。石英ガラ
スファイバｌの先端部下なわち窓部１ａは凸レンズ状と
し、広い視野からの燃焼光が導入できるようになってい
る。しかし、このような構成のものの場合、前記したご
とく、窓部１ａが汚れ易く問題であった。wJ2 Figures (a) and (b) are sectional views of the main parts near the guide body window of the spark plug-integrated combustion senna that Iri has been considering so far. The light guide 1 is a quartz glass fiber with excellent heat resistance, and is disposed so as to pass through the center shaft of the center electrode 2 of the spark plug. Spark discharge as a spark plug occurs between the minute gap between the center electrode 2 and the outer electrode 3. In the case of Figure 2 (a), the 83rd part is where the spark release and misfortune are performed, and in the case of Figure 2 (b), the sb part is where the fireworks are released. The lower end of the quartz glass fiber l, that is, the window portion 1a, is shaped like a convex lens, so that combustion light can be introduced from a wide field of view. However, in the case of such a structure, as described above, the window portion 1a easily gets dirty, which is a problem.
以下、本発明の実施例を図面により詳細に説明する。第
１図ζ本発明になる点火プラグ一体型の燃焼センナの構
造図である。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a structural diagram of a combustion sensor integrated with a spark plug according to the present invention.
金属ケーシング１０の中に配設した電気的絶縁性を有し
た碍子１１．この碍子１１の中に配設した高電圧端子１
２．中心電極１３．この両者を貫通する形で配設された
石英ガラスファイバ１６、この囲者の気密結合を図った
導電性ガラス封着部１４％金属ケーシングｌＯの端部に
形成した外側１局１５より構成されている。石英ガラス
ファイバ１６の先端部すなわち窓部１６ａは、中心電極
１３の先端かられずかに突き出した形とし、この式部１
６ａの先端部と外側電＊ＸＳとは極く微少の間隙をもっ
て形成している。中心を極１３と外＠電極１５との間の
火花放電ギャップＳｏは通常の点火プラグと四様０．７
〜１．２頭程度の任意の値にセットＴｆ’Ｌば良く、前
記窓部１６ａの突き出しＪｉはこの火花放電ギャップＳ
ａよりわずかに小ざい値にする。したがって、このよう
な構成の場合。An insulator 11 having electrical insulation properties disposed within the metal casing 10. High voltage terminal 1 arranged inside this insulator 11
2. Center electrode 13. It consists of a quartz glass fiber 16 arranged to penetrate both of them, and an outer one 15 formed at the end of a 14% metal casing 10 with a conductive glass sealing part for airtight connection of this enclosure. There is. The tip of the silica glass fiber 16, that is, the window 16a, is shaped to slightly protrude from the tip of the center electrode 13.
The tip of 6a and the outer electrode *XS are formed with an extremely small gap. The spark discharge gap So between the center pole 13 and the outer @ electrode 15 is 0.7 in all directions compared to a normal spark plug.
It is sufficient to set Tf'L to an arbitrary value of about 1.2 heads, and the protrusion Ji of the window portion 16a is equal to this spark discharge gap S.
Set the value to be slightly smaller than a. So for such a configuration.
■方向からの燃焼光は外側電極１５によって遮られるの
で石英ガラスファイバ１６内Ｌ／ｃは４人されず、■方
向のごとき石英ガラスファイバ１６の中心軸の回転面方
向力、ら燃焼光が主に導入されることになる。したがっ
て、窓部１６ａはこのような方向からの光を導入できる
ように、この部分はコアークラッドからなるファイバで
なく、コアのみで２Ｉ４Ｐｊ、する必要がある。点火プ
ラグの放電火花は、火花放電ギャップＳｏ間のいずれか
の個所を飛ぶことになるが、この場合、窓部１６ａの表
面にカーホン等の付着物が付き汚損してくると、この付
着物によりその表面の絶縁抵抗が小ざくなってきて、ギ
ャップ５Ｇ（７Ｊ仝隙部？火花放電するより、この付着
物部に沿って放電する。すなわち、沿面放電の方がし易
くなり、活発に沿面放電が行われるようになる。したが
って、沿面放電した個所の窓部１６ａの表面は、放電火
花により付着物が焼き切られきれいになる。窓部１６ａ
の円周方向でこの沿面放電経路は随時変化する。Ｔなゎ
ち、付着物によって絶縁抵抗が小さくなっているところ
ほど火花放電し易いので、沿面放電によってきれいにな
った個所の窓部表面経路ＶＣは次の機会には放電せず、
汚損している個所を次々と沿面放電することになり、窓
ｆ！１１６ａの表面は常に沿面放電火花により清浄化さ
れることになる。Since the combustion light from the ■ direction is blocked by the outer electrode 15, the L/c inside the quartz glass fiber 16 is not affected by the quartz glass fiber 16, and the combustion light mainly comes from the rotational surface direction force of the central axis of the quartz glass fiber 16 in the ■ direction. It will be introduced in Therefore, in order for the window portion 16a to be able to introduce light from such a direction, this portion needs to be made of only the core, 2I4Pj, rather than a fiber made of core cladding. The discharge spark of the ignition plug will fly somewhere between the spark discharge gap So, but in this case, if the surface of the window portion 16a becomes contaminated with deposits such as carphones, this deposit may cause As the insulation resistance of the surface becomes smaller, discharge occurs along this deposited part rather than spark discharge in the gap 5G (7J gap). Therefore, the surface of the window portion 16a at the location where the creeping discharge has occurred is cleaned of the deposits by the discharge sparks.The surface of the window portion 16a is clean.
This creeping discharge path changes at any time in the circumferential direction. In other words, the lower the insulation resistance due to deposits, the more likely spark discharge will occur, so the window surface path VC that has been cleaned by creeping discharge will not be discharged the next time.
Creeping discharge occurs in the contaminated areas one after another, causing the window f! The surface of 116a will always be cleaned by creeping discharge sparks.
早】図に示した実施例の他の利点に、窓部】６ａの突き
出た部分が外側を極１５によってガードされているので
、増扱い中、あるいけエンジンに装着時等に窓！１６ａ
を破損することがなくなり増扱い易くなるという点であ
る。Another advantage of the embodiment shown in the figure is that the protruding part of the window part 6a is protected on the outside by the pole 15, so the window part 6a can be easily removed during expansion or when installed on an engine. 16a
This means that it will not be damaged and will be easier to handle.
第３図は本発明の他の応用例である。＠１面のものと異
なる点に外９１１１電極２０の形状である。■方向から
の燃焼光も纏入できるように視野孔２１を開口している
。この視野孔２１は石英ガラスファイバ１６とほぼ同軸
上に形成することが望ましい。そこでこの視野孔２１の
ＪＪＯ工姓を考慮して、外側電極２０の先端部に視野孔
２１を開口した外側電極チップ２０ａを接合するように
している。FIG. 3 shows another example of application of the present invention. The difference from the one on the first side is the shape of the outer 9111 electrode 20. The viewing hole 21 is opened so that combustion light from the direction (1) can also enter. It is desirable that the viewing hole 21 be formed substantially coaxially with the silica glass fiber 16. Therefore, in consideration of the JJO design of the viewing hole 21, an outer electrode chip 20a having a viewing hole 21 opened is bonded to the tip of the outer electrode 20.
第４図は＠３（２）を＜ｐ；）方向から見た因であり、
窓部１６ａが見える構成となっている。どの視野孔２１
が小ざいほど窓部１６ａの沿面放電する面積は大きくな
るので、窓部１６Ｈの許容汚れ量と燃焼光導入視野範囲
との兼ね合いで最適値を任意に決定する必要がある。Figure 4 shows the cause of @3(2) viewed from <p;) direction,
The window portion 16a is configured to be visible. which viewing hole 21
The smaller the value, the larger the surface area of the window 16a where creeping discharge occurs. Therefore, it is necessary to arbitrarily determine the optimum value in consideration of the permissible amount of contamination of the window 16H and the combustion light introduction viewing range.
以上の結果から明らかなように、ｇａｍ、！４図に示し
た実施例社燃焼光導入視野範囲の拡大と窓部の沿面放電
による付着物清浄化とを両立できるという効果を有して
いる。As is clear from the above results, gam,! The embodiment shown in FIG. 4 has the effect of being able to simultaneously expand the viewing range through which the combustion light is introduced and clean the deposits by creeping discharge on the window portion.
以上の本発明ＶＣより、点火プラグと一体となった燃焼
センナの利点を有効に利用し、燃焼光の光導体である石
英ガラスファイバの窓部に付Ｎする汚れを窓部沿面放電
火花によって焼き取ることができ、経ｆ＊ｆ化の少ない
、信頼性の高い燃焼セン？ｆ−楕築することができる。According to the above-mentioned VC of the present invention, the advantage of the combustion sensor integrated with the spark plug is effectively used, and the dirt attached to the window of the quartz glass fiber, which is the light guide of the combustion light, is burned off by creeping sparks of the window. Is it a highly reliable combustion sensor that can be used to remove fuel and has less f*f change? An f-ellipse can be constructed.
第１図は本発明の実施例の構造図である。Ｗｃ２同は従
来例の要部断面図である。第３図は本発明の他の実施例
であり、第４図はその側面図である。
１３・・・中心電極、１５・・・外側電極、１６・・・
石英ガ代理人 弁理士 小川勝男 ″′
第１ 躬
■
？、３ｆｎ
％４ｆ２FIG. 1 is a structural diagram of an embodiment of the present invention. Wc2 is a sectional view of a main part of a conventional example. FIG. 3 shows another embodiment of the present invention, and FIG. 4 is a side view thereof. 13... Center electrode, 15... Outer electrode, 16...
Quartz Ga agent patent attorney Katsuo Ogawa ″′ 1st error ■ ?, 3fn %4f2
Claims (1)
ファイバ状の光導体を有した点火プラグ一体型の燃焼セ
ンサにおいて、 前記光導体の燃焼室側端部を点火プラグの中心電極と外
側電極で形成する火花放電ギャップの空隙部まで突き出
すように構成したことを特徴とする汚損抑止式燃焼セン
サ。[Scope of Claims] 1. In a spark plug-integrated combustion sensor having an optical fiber-shaped light guide disposed so as to pass through a central shaft portion of the spark plug, an end portion of the light guide on the combustion chamber side. A contamination-preventing combustion sensor characterized in that it is configured to protrude into a void of a spark discharge gap formed by a center electrode and an outer electrode of a spark plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7655986A JPS62234887A (en) | 1986-04-04 | 1986-04-04 | Contamination-proof burning sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7655986A JPS62234887A (en) | 1986-04-04 | 1986-04-04 | Contamination-proof burning sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62234887A true JPS62234887A (en) | 1987-10-15 |
Family
ID=13608603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7655986A Pending JPS62234887A (en) | 1986-04-04 | 1986-04-04 | Contamination-proof burning sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62234887A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006526142A (en) * | 2003-03-13 | 2006-11-16 | キストラー ホールディング アクチエンゲゼルシャフト | Automatic clean optical sensor |
| JP2015043278A (en) * | 2013-08-26 | 2015-03-05 | 株式会社島津製作所 | Plug built-in type optical measuring probe and optical measuring device including the same |
-
1986
- 1986-04-04 JP JP7655986A patent/JPS62234887A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006526142A (en) * | 2003-03-13 | 2006-11-16 | キストラー ホールディング アクチエンゲゼルシャフト | Automatic clean optical sensor |
| JP2015043278A (en) * | 2013-08-26 | 2015-03-05 | 株式会社島津製作所 | Plug built-in type optical measuring probe and optical measuring device including the same |
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