JPS63144221A - Temperature measurement type plug by infrared ray - Google Patents
Temperature measurement type plug by infrared rayInfo
- Publication number
- JPS63144221A JPS63144221A JP29128586A JP29128586A JPS63144221A JP S63144221 A JPS63144221 A JP S63144221A JP 29128586 A JP29128586 A JP 29128586A JP 29128586 A JP29128586 A JP 29128586A JP S63144221 A JPS63144221 A JP S63144221A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- center electrode
- insulator
- layer
- pipe
- 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
- 238000009529 body temperature measurement Methods 0.000 title description 6
- 239000013307 optical fiber Substances 0.000 claims abstract description 41
- 239000012212 insulator Substances 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 238000002485 combustion reaction Methods 0.000 claims description 19
- 239000010410 layer Substances 0.000 claims description 13
- 239000011241 protective layer Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 229920006362 Teflon® Polymers 0.000 abstract description 11
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 229920006231 aramid fiber Polymers 0.000 abstract description 3
- 229920001296 polysiloxane Polymers 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005452 bending Methods 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 abstract 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
- 238000005476 soldering Methods 0.000 abstract 1
- 239000004809 Teflon Substances 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910001179 chromel Inorganic materials 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000809 Alumel Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229940056932 lead sulfide Drugs 0.000 description 1
- 229910052981 lead sulfide Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Radiation Pyrometers (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、点火プラグに組み込まれエンジンの燃焼室
からの熱により中心電極先端内面より放射される赤外線
を検出して温度を測るプラグに係り、特には赤外線を伝
達するに光ファイバを用いて行なう温度計測形プラグに
関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a plug that is incorporated into a spark plug and measures temperature by detecting infrared rays emitted from the inner surface of the tip of the center electrode by heat from the combustion chamber of the engine. In particular, the present invention relates to a temperature measuring plug that uses an optical fiber to transmit infrared rays.
［従来の技術］
一般にエンジンにあっては、燃焼室内の温度を連続的に
測定してエンジンの稼働状態を精密に診断することが行
なわれている。このため従来では点火プラグにＣＡ（ア
ルメル−・り［Ｉメル）熱雷対を一体的に組み込んで熱
雷対からの出力により燃焼室内の温度を検出していた。[Prior Art] Generally speaking, in engines, the temperature within the combustion chamber is continuously measured to precisely diagnose the operating state of the engine. For this reason, in the past, a CA (alumel/Imel) thermal lightning pair was integrally incorporated into the ignition plug, and the temperature inside the combustion chamber was detected based on the output from the thermal lightning pair.
この場合、高圧コードからのノイズによりＥＦＩ燃料噴
射システムが誤動作したり、熱電対の出力にハイテンシ
ョンが加わるので、ペンレコーダによる温度測定記録が
困難である。これを防ぐためＣＡ（アルメル−クロメル
）熱雷対をシリコフチ１−ブで被覆し、さらにステンレ
スメツシュによりシールドしたうえで接地している。In this case, the EFI fuel injection system may malfunction due to noise from the high voltage cord, and high tension is applied to the output of the thermocouple, making it difficult to record temperature measurements using a pen recorder. To prevent this, the CA (alumel-chromel) thermal lightning pair is covered with a silicone tube, further shielded with a stainless steel mesh, and then grounded.
また、他のものでは、ＣＡ（アルメル−クロメル）熱雷
対の出力を発光ダイオードから成る変換器を介して光信
号に変え、エンジンから記録計の近辺まで延出した光フ
ァイバにより光７１ｆ′ａ換ムに送信している。In another method, the output of a CA (alumel-chromel) thermal lightning pair is converted into an optical signal via a converter consisting of a light emitting diode, and an optical fiber extending from the engine to the vicinity of the recorder converts the output of a CA (alumel-chromel) thermal lightning pair into an optical signal. sending to another computer.
［発明が解決しようとする問題点］
ところが、前者では、接地するのにシリコンチューブや
ステンレスメツシュなどの余分な部材を要し、組み立て
が煩雑になるとともにコスト的にも不利である。[Problems to be Solved by the Invention] However, the former requires extra members such as a silicone tube and stainless steel mesh for grounding, making assembly complicated and being disadvantageous in terms of cost.
また、後者では、発光ダイオードの変換器がエンジンの
振動や熱的影響を受は易く、長期の使用に伴い破損する
おそれがある。Furthermore, in the latter case, the light emitting diode converter is easily affected by engine vibration and heat, and there is a risk of damage over long-term use.
これらの問題を解消するために近年、光ファイバを点火
プラグ内に一体的に組み込み、この光ファイバによりエ
ンジンの燃焼室内で発生する赤外線を受けて温度に変換
することが考えられている。In order to solve these problems, in recent years it has been considered to integrate an optical fiber into the spark plug and use the optical fiber to receive infrared rays generated within the combustion chamber of the engine and convert it into temperature.
ところが、光ファイバは損傷を受は易い石英ガラスなど
から形成されているため補強性および可撓性などの性質
を有する保１層で被覆する必要がある。この場合には、
保護層のプラグに近接する部分は高い熱を受けるため、
こういった保Ｆｓ！ｒ！Ｊには耐熱性も要求される。However, since the optical fiber is made of quartz glass or the like, which is easily damaged, it is necessary to cover it with a protective layer having properties such as reinforcement and flexibility. In this case,
The part of the protective layer close to the plug receives high heat, so
These kind of protection Fs! r! Heat resistance is also required for J.
したがって、光ファイバを用いる場合には、光ファイバ
が補強、耐熱および可撓性をともに有する保護層を備え
た温度計測用プラグが登場することが持たれていた。Therefore, when an optical fiber is used, it has been anticipated that a temperature measuring plug will be developed in which the optical fiber is provided with a protective layer that has both reinforcement, heat resistance, and flexibility.
［発明の目的］
この発明はこのような期待に応じるべくなされ、その目
的は接地が不要になり、組み立ての煩雑さやコスト的な
不利をなくしたうえで、光ファイバを補強、耐熱および
可撓性をともに有する保護層により被覆でき光ファイバ
の保護効果を充分ならしめる優れた赤外線による温度計
測形プラグを提供するにある。[Purpose of the invention] This invention was made to meet these expectations, and its purpose is to eliminate the need for grounding, the complexity of assembly, and cost disadvantages, and to strengthen optical fibers, make them heat resistant and flexible. An object of the present invention is to provide an excellent infrared ray temperature measuring plug which can be coated with a protective layer having both of the above properties and has a sufficient protective effect on the optical fiber.
Ｅ問題点を解決するための手段］
この発明は、中心電極と、この中心電極を内部に保持す
る絶縁体と、この絶縁体を外周から支持するとともに、
前記中心電極の先端部との間に火花間隙を形成するよう
に先端に外側電極を突設した主体金具から成る点火プラ
グにおいて、前記中心電極に、先端部がエンジンの燃焼
室内に露出し且つ、一体に形成された管状部と、この管
状部内に熱良導性金属からなるパイプが嵌着されると共
にこのパイプ内に一端部が前記燃焼室からの熱により中
心電極先端内面より放射される赤外線を眞配管状部を介
して受けるように設けられ、他端部が前記絶縁体から外
部に出て光検出部に接続される光ファイバと、可撓性、
補強性および耐熱性をともに有する材料から形成されて
？ｉｉ記光ファイバを少なくとも前記絶縁体の付近に９
訳する部分から被覆する保護層を有する構成を採用して
いる。Means for Solving Problem E] This invention provides a center electrode, an insulator that holds the center electrode inside, supports the insulator from the outer periphery, and
A spark plug consisting of a metal shell having an outer electrode protruding from its tip so as to form a spark gap with the tip of the center electrode, wherein the tip of the center electrode is exposed within the combustion chamber of the engine; A tubular part is integrally formed, and a pipe made of a metal with good thermal conductivity is fitted into the tubular part, and one end of the pipe has an infrared ray radiated from the inner surface of the tip of the center electrode due to the heat from the combustion chamber. an optical fiber, the other end of which is provided to receive the optical fiber through a tubular portion, and whose other end extends outside the insulator and is connected to the photodetector;
Is it made from a material that is both reinforcing and heat resistant? ii. the optical fiber at least near the insulator;
A structure is adopted in which a protective layer is provided to cover the area to be translated.
［作用］
この発明によれば、光ファイバを用いて燃焼室からの赤
外線を受けるようにしているので、高い絶縁性が得られ
電界、磁界の影響を受は難くなり、従来と相違して接地
が不要になり、゛組み立ての煩雑さやコスト的な不利が
なく、変換器の発光ダイオードがエンジン近傍に設けら
れているものと相違して、変換器の破損といったことが
なくなり、しかも光ファイバは、可撓性、補強性および
耐熱性をともに有する材料から形成された保護層で被覆
されていることから光ファイバにＩｎ傷が生ずるような
ことがなくなる。[Function] According to this invention, since an optical fiber is used to receive infrared rays from the combustion chamber, high insulation properties are obtained, making it difficult to be affected by electric and magnetic fields, and unlike conventional methods, it is difficult to ground. ``There is no need for assembly, there is no cost disadvantage, there is no possibility of damage to the converter unlike in the case where the light emitting diode of the converter is installed near the engine, and the optical fiber is Since the optical fiber is coated with a protective layer made of a material that has flexibility, reinforcing properties, and heat resistance, it is possible to prevent In from occurring on the optical fiber.
［発明の効果］
この発明によれば、光ファイバを用いて燃焼室からの赤
外線を受けるようにしているので、高い絶縁性が得られ
電界、磁界の影響を受は難くなり、従来と相違して接地
が不要になり、組み立ての煩雑さやコスト的な不利がな
く、ペンレコーダによる連ＶＣ温度測定が可能になり、
変換器の発光ダイオードがエンジンに設けられているも
のと相違して、変換器の破損といったことがなくなるう
えに、光ファイバは、可撓性、補強性および耐熱性をと
もに有する材料から形成された保護層で被覆されている
ことから光ファイバに損傷が生じず、充分な保護効果が
発揮されるものである。[Effects of the Invention] According to this invention, since an optical fiber is used to receive infrared rays from the combustion chamber, high insulation properties are obtained and the combustion chamber is less susceptible to the effects of electric and magnetic fields, which is different from conventional methods. It eliminates the need for grounding, eliminates the complexity of assembly and costs, and enables continuous VC temperature measurement using a pen recorder.
Unlike the case where the light emitting diode of the converter is installed in the engine, there is no risk of damage to the converter, and the optical fiber is made of a material that is flexible, reinforcing, and heat resistant. Since the optical fiber is coated with a protective layer, no damage occurs to the optical fiber, and a sufficient protective effect is exhibited.
［実施例］ 以下この発明の一実施例を図面を参照して説明する。[Example] An embodiment of the present invention will be described below with reference to the drawings.
まず、第１図および第２図において、１は絶縁体として
の碍子で、これの中心部には細長な挿通孔２を軸方向い
っばいに亘って形成している。この碍子１の挿通孔２に
は、−例として内径を１、ＯＩＩｌｍとする有底管状の
中心電極３を装着し、その有底管状部３ａの長さは記号
Ｍで示すように０．２ないし２．０１１＋ｌｌの寸法範
囲で外部に突出している。この中空の中心電極３内には
、例えば内径を０．３ないし０．４ｍｍとし、外径を０
．９ｍａ＋とする銅製のバイブ４を同心的に配設し、限
ろう付けにより固定している。さらに、このバイブ４内
には、フッ素を含有した石英ガラスから成り、コア５ａ
およびクラッド５ｂの径寸法をバイブ４の寸法に応じて
順に０．２ｍｍおよび０．３ｍｍとする光ファイバ５を
封入して接着剤により固定し、その左端部を有底管状部
３ａの底部に一体となるように密着させている。First, in FIGS. 1 and 2, reference numeral 1 denotes an insulator serving as an insulator, and an elongated insertion hole 2 is formed in the center of the insulator throughout the axial direction. A bottomed tubular center electrode 3 having an inner diameter of 1 and OIIlm, for example, is attached to the insertion hole 2 of the insulator 1, and the length of the bottomed tubular portion 3a is 0.2 as shown by the symbol M. It protrudes outward in a size range of 2.011+ll. Inside this hollow center electrode 3, the inner diameter is set to 0.3 to 0.4 mm, and the outer diameter is set to 0.
．． Copper vibrators 4 of 9 ma+ are arranged concentrically and fixed by limited brazing. Furthermore, inside this vibrator 4, a core 5a made of fluorine-containing quartz glass is provided.
Then, an optical fiber 5 with a diameter of 0.2 mm and 0.3 mm in accordance with the size of the vibrator 4 is sealed in the cladding 5b and fixed with adhesive, and its left end is integrated into the bottom of the bottomed tubular part 3a. They are placed in close contact so that
この光ファイバ５の有底管状部３ａに対する密着面は軸
方向に垂直に切断することにより形成され、その切断面
は欠けやひけの無い円滑な面を形成し、良好な受光状態
が得られるようにしている。そして、中心電極３の図示
右端部はバイブ４とともに、碍子１の外部に所定寸法だ
け延出され、光ファイバ５の右端部は中心電極３および
バイブ４よりも碍子１の外部に延長されてこの延長部の
端部にはコネクタ６が接続されている。この場合、光フ
ァイバ５には、詳しくは第１図に示すようにバイブ４の
右端部からコネクタ６にかけてシリコン層Ａで被覆し、
このシリコンｆｆ１Ａはテフロンｌｉ！［３により被覆
されている。さらに、テフ［１ン層Ｂはアラミツド繊維
Ｃを介してテフロン層りにより被覆されている。The contact surface of the optical fiber 5 with respect to the bottomed tubular portion 3a is formed by cutting perpendicularly to the axial direction, and the cut surface forms a smooth surface without chips or sink marks, so that a good light receiving condition can be obtained. I have to. The right end of the center electrode 3 as shown in the figure is extended to the outside of the insulator 1 by a predetermined distance along with the vibrator 4, and the right end of the optical fiber 5 is extended to the outside of the insulator 1 further than the center electrode 3 and the vibrator 4. A connector 6 is connected to the end of the extension. In this case, the optical fiber 5 is coated with a silicon layer A from the right end of the vibrator 4 to the connector 6, as shown in FIG.
This silicon ff1A is Teflon Li! [Covered by 3. Furthermore, the Teflon layer B is covered with a Teflon layer via the aramid fiber C.
一方、８は碍子１の左端部外周に装着した主体金具で、
これは外周面に取付用の雄ねじ部８ａを形成するととも
に、外側電極９を一体に形成し、この外側電極９と中心
電極３の有底管状部３ａとの間に火花間隙９ａを設けて
いる。１０は挿通孔２内で中心電極３に接触状態に設け
た接続端子で、この端子１０には端子ナツト１２を介し
て高電圧発生装置（図示せず）に連結される導線１１が
接続されている。導線１１はテフロンチューブ１１ａに
より被覆され、この状態でテフロンチュー・ブ１１ａは
光ファイバ５のテフロン層りに束ねられるようにしてシ
リコンチューブ１１ｂにより覆われている。On the other hand, 8 is a main metal fitting attached to the outer periphery of the left end of the insulator 1.
This has a male screw part 8a for attachment formed on the outer peripheral surface, an outer electrode 9 is integrally formed, and a spark gap 9a is provided between this outer electrode 9 and the bottomed tubular part 3a of the center electrode 3. . Reference numeral 10 denotes a connection terminal provided in the insertion hole 2 in contact with the center electrode 3, and a conductor 11 connected to a high voltage generator (not shown) is connected to this terminal 10 via a terminal nut 12. There is. The conducting wire 11 is covered with a Teflon tube 11a, and in this state, the Teflon tube 11a is bundled with the Teflon layer of the optical fiber 5 and covered with a silicon tube 11b.
しかして、かよう構成された点火プラグは第３図に示す
エンジンのシリンダヘッド１３に主体金具８の雄ねじ部
８ａを介して螺着され、中心電極３の有底管状部３ａは
外側電極９とともに燃焼室１４内に露出している。この
エンジンにおいて、１５はシリンダ、１６はピストン、
１７は排気ボート、１８は吸気ボート、１９は排気弁、
２０は吸気弁である１、シかして、光ファイバ５のコネ
クタ６は硫化鉛ＰｂＳから成る光検出器２１、放射率補
償回路２２、アナログ−デジタルコンバータ２３、リニ
アライザー２４を順に介してデジタル用の表示装置２５
に接続されている。また、りニアライザー２４からはデ
ジタル−アナログコンバータ２６を介してペンレコーダ
２７に接続されている。Thus, the spark plug configured as described above is screwed into the cylinder head 13 of the engine shown in FIG. It is exposed within the combustion chamber 14. In this engine, 15 is a cylinder, 16 is a piston,
17 is an exhaust boat, 18 is an intake boat, 19 is an exhaust valve,
Reference numeral 20 denotes an intake valve 1, and the connector 6 of the optical fiber 5 is connected to a digital signal via a photodetector 21 made of lead sulfide PbS, an emissivity compensation circuit 22, an analog-to-digital converter 23, and a linearizer 24 in this order. Display device 25 for
It is connected to the. Further, the linearizer 24 is connected to a pen recorder 27 via a digital-to-analog converter 26.
しかして、エンジンの稼働状態では燃料が燃焼室１４内
で燃焼し、プラグ全体が昇温して燃焼室１４と同一の温
度になる。プラグ全体が昇温するに伴い中心電極３の有
底管状部３ａから比較的波長の長い熱輻射、すなわち赤
外線が発生し、この赤外線を光ファイバ５が受け、光フ
ァイバ５を通して検出器２１に送信する。この検出器２
１は赤外線を電気信号に変換し、この電気信号を放射率
補償回路２２により補償する。こうして補償された電気
信号はアナログ−デジタルコンバー、り２３およびリニ
アライザー２４を介して表示装置２５により燃焼室１４
内の温度がデジタル表示される。Therefore, when the engine is in operation, fuel burns in the combustion chamber 14, and the temperature of the entire plug rises to the same temperature as the combustion chamber 14. As the temperature of the entire plug rises, thermal radiation with a relatively long wavelength, that is, infrared rays, is generated from the bottomed tubular portion 3a of the center electrode 3, and this infrared rays are received by the optical fiber 5 and transmitted to the detector 21 through the optical fiber 5. do. This detector 2
1 converts infrared rays into an electric signal, and compensates this electric signal by an emissivity compensation circuit 22. The thus compensated electric signal is sent to the combustion chamber 10 by a display device 25 via an analog-to-digital converter, a linearizer 23, and a linearizer 24.
The temperature inside is displayed digitally.
と同時に、デジタル−アナログコンバータ２６を介して
ペンレコーダ２７により燃焼室１４内の温度が連続的に
記録される。At the same time, the temperature inside the combustion chamber 14 is continuously recorded by the pen recorder 27 via the digital-to-analog converter 26.
このように上記構成では、燃焼室１４内の温度を中心電
極３からの赤外線として捕え、この赤外線を光ファイバ
５により出力させるようにしたので、高絶縁性が得られ
るとともに、電界、磁界の影響を受は難くなり、従来と
相違して接地が不要になり、組み立ての煩雑さやコスト
的な不利がなく、ペンレコーダによる連続温度測定が可
能になる。In this way, in the above configuration, the temperature inside the combustion chamber 14 is captured as infrared rays from the center electrode 3, and this infrared rays are outputted through the optical fiber 5, so that high insulation properties are obtained and the influence of electric and magnetic fields is reduced. Unlike conventional methods, this method eliminates the need for grounding, eliminates the complexity of assembly and costs, and enables continuous temperature measurement using a pen recorder.
また、光ファイバ５のバイブ４から延出する部分は、耐
熱、補強および可撓性を併有するシリコン層Ａ、テフロ
ン層Ｂ１アラミツド繊維層Ｃおよびテフロン層りにより
被覆したので、光ファイバ５はプラグに近接して高温度
の熱を受ける状態にあっても充分保護されるとともに、
コネクタ６の接続時などに光ファイバ５を曲げ伸ばしし
ても損傷や折損などの不都合が生ずることがない。しか
し更に万全を期して中心電極右端面部と九フＩイバーテ
フロン層を完全に金属パイプ２８の内部に於いて接着剤
で固定する。In addition, the part of the optical fiber 5 extending from the vibrator 4 is covered with a silicon layer A, a Teflon layer B, an aramid fiber layer C, and a Teflon layer, which have heat resistance, reinforcement, and flexibility, so that the optical fiber 5 can be plugged. It is fully protected even when exposed to high temperature heat in close proximity to
Even if the optical fiber 5 is bent and stretched when connecting the connector 6, etc., no inconvenience such as damage or breakage will occur. However, to be even more careful, the right end surface of the center electrode and the 9F Iverteflon layer are completely fixed inside the metal pipe 28 with adhesive.
また、発光ダイオードがエンジンに設けられているもの
と違って、発光ダイオードを含む変換器の破損といった
ことがなくなる。Moreover, unlike the case where the light emitting diode is provided in the engine, there is no chance of damage to the converter including the light emitting diode.
さらには、光ファイバ５は実施例上、気密な有底管状部
３ａの、内に収納されており、光ファイバ５に対するデ
ポジットの付着がなくなり、正確な温度測定が長期に亘
って行なわれ且つ、有底管状部３ａがプラグ内に組み込
まれているので、プラグ全体と同様の温度勾配を有する
ようになるため測定に高い信頼性が確保されるようにな
る。Furthermore, the optical fiber 5 is housed in the airtight bottomed tubular portion 3a in the embodiment, so that deposits are not attached to the optical fiber 5, and accurate temperature measurement can be performed over a long period of time. Since the bottomed tubular portion 3a is incorporated into the plug, it has the same temperature gradient as the entire plug, ensuring high reliability in measurement.
また、中心電橋３の有底管状部３ａの長さ寸法を０．２
ないし２．０＋ａｍの範囲に設定したので、燃焼室１４
内の燃焼に伴いスワール（渦流）が発生し、曲げモーメ
ントが有底管状部３ａに加わっても有底管状部３ａに折
損などの不都合が生ずる虞がないといった実施例上の効
果が得られる。In addition, the length dimension of the bottomed tubular portion 3a of the central electric bridge 3 is set to 0.2
Since it is set in the range of 2.0 to 2.0 + am, the combustion chamber 14
The advantageous effect of this embodiment is that even if a swirl (eddy current) is generated due to the combustion inside, and a bending moment is applied to the bottomed tubular portion 3a, there is no risk of breakage or other problems occurring in the bottomed tubular portion 3a.
なお、この発明の適用対象としてはガソリンエもよい。Note that this invention can also be applied to gasoline engines.
また、上記実施例では光ファイバ５の先端を有底管状部
３ａに密着させるようにしたが、その底部から１１１以
内の寸法範囲なら離すようにしてもよい。また、光ファ
イバ５に対する可撓、補強および耐熱性の各層は上記実
施例のように複数から成るものに限られず、場合によっ
ては単一の層から成るものでもよい。Further, in the above embodiment, the tip of the optical fiber 5 is brought into close contact with the bottomed tubular portion 3a, but it may be separated within a size range of 111 degrees from the bottom. Furthermore, the flexible, reinforcing, and heat-resistant layers for the optical fiber 5 are not limited to a plurality of layers as in the above embodiment, but may be a single layer in some cases.
その他、具体的な実施にあたっては発明の要旨を逸脱し
ない範囲で種々変更できる。In addition, various changes may be made in the specific implementation without departing from the gist of the invention.
図面はこの発明の一実施例を示し、第１図はプラグの全
体的な縦断面図、第２図は要部の拡大縦断面図、第３図
は全体的な温度測定システムを示すブロック図である。The drawings show one embodiment of the present invention; FIG. 1 is an overall longitudinal sectional view of the plug, FIG. 2 is an enlarged longitudinal sectional view of the main parts, and FIG. 3 is a block diagram showing the overall temperature measurement system. It is.
Claims (1)
体と、この絶縁体を外周から支持するとともに、前記中
心電極の先端部との間に火花間隙を形成するように先端
に外側電極を突設した主体金具から成る点火プラグにお
いて、 前記中心電極に、先端部がエンジンの燃焼室内に露出し
且つ、一体に形成された管状部と、この管状部内に熱良
導性金属からなるパイプが嵌着されると共にこのパイプ
内に一端部が前記燃焼室からの熱により中心電極先端内
面より放射される赤外線を前記管底部を介して受けるよ
うに設けられ、他端部が前記絶縁体から外部に出て光検
出部に接続される光ファイバと、 可撓性、補強性および耐熱性をともに有する材料から形
成されて前記光ファイバを少なくとも前記絶縁体の付近
に位置する部分から被覆する保護層とを具備したことを
特徴とする赤外線による温度計測形プラグ。 ２）前記保護層は、互いに重合する状態に嵌め込まれた
三重層から成ることを特徴とする特許請求の範囲第１項
に記載の赤外線による温度計測形プラグ。(1) A center electrode, an insulator that holds the center electrode inside, and an outer electrode that supports the insulator from the outer periphery and is arranged at the tip to form a spark gap between the center electrode and the tip of the center electrode. In the spark plug, the center electrode has a tubular part formed integrally with the tip part exposed inside the combustion chamber of the engine, and a pipe made of a thermally conductive metal inside the tubular part. is fitted into this pipe, and one end is provided in this pipe so as to receive infrared rays emitted from the inner surface of the tip of the center electrode due to heat from the combustion chamber through the tube bottom, and the other end is provided from the insulator. An optical fiber that exits to the outside and is connected to the photodetector, and a protection that is made of a material that has flexibility, reinforcement, and heat resistance and that covers the optical fiber at least from a portion located near the insulator. An infrared temperature measuring plug characterized by comprising a layer. 2) The infrared thermometer plug according to claim 1, wherein the protective layer is comprised of three layers that are fitted in a mutually overlapping state.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29128586A JPS63144221A (en) | 1986-12-06 | 1986-12-06 | Temperature measurement type plug by infrared ray |
| BR8706629A BR8706629A (en) | 1986-12-06 | 1987-12-02 | THERMOMETRIC IGNITION CANDLE BY INFRARED RAYS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29128586A JPS63144221A (en) | 1986-12-06 | 1986-12-06 | Temperature measurement type plug by infrared ray |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63144221A true JPS63144221A (en) | 1988-06-16 |
| JPH0523704B2 JPH0523704B2 (en) | 1993-04-05 |
Family
ID=17766898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29128586A Granted JPS63144221A (en) | 1986-12-06 | 1986-12-06 | Temperature measurement type plug by infrared ray |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS63144221A (en) |
| BR (1) | BR8706629A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100811648B1 (en) | 2007-02-05 | 2008-03-11 | 주식회사 유라테크 | Teflon washer for glow plug and glow flug with teflon washer |
| AT524795B1 (en) * | 2021-07-21 | 2022-09-15 | Lec Gmbh | Device for measuring the electrode temperature of a spark plug |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61181879U (en) * | 1985-05-01 | 1986-11-13 |
-
1986
- 1986-12-06 JP JP29128586A patent/JPS63144221A/en active Granted
-
1987
- 1987-12-02 BR BR8706629A patent/BR8706629A/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61181879U (en) * | 1985-05-01 | 1986-11-13 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100811648B1 (en) | 2007-02-05 | 2008-03-11 | 주식회사 유라테크 | Teflon washer for glow plug and glow flug with teflon washer |
| AT524795B1 (en) * | 2021-07-21 | 2022-09-15 | Lec Gmbh | Device for measuring the electrode temperature of a spark plug |
| AT524795A4 (en) * | 2021-07-21 | 2022-09-15 | Lec Gmbh | Device for measuring the electrode temperature of a spark plug |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0523704B2 (en) | 1993-04-05 |
| BR8706629A (en) | 1988-07-19 |
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