JPH04141977A - Ignition plug for internal combustion engine - Google Patents
Ignition plug for internal combustion engineInfo
- Publication number
- JPH04141977A JPH04141977A JP2263048A JP26304890A JPH04141977A JP H04141977 A JPH04141977 A JP H04141977A JP 2263048 A JP2263048 A JP 2263048A JP 26304890 A JP26304890 A JP 26304890A JP H04141977 A JPH04141977 A JP H04141977A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- ignition
- ion current
- internal combustion
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 abstract description 13
- 239000000446 fuel Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000010891 electric arc Methods 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 239000012212 insulator Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction 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
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
- F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
- F02P17/12—Testing characteristics of the spark, ignition voltage or current
- F02P2017/125—Measuring ionisation of combustion gas, e.g. by using ignition circuits
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
- Spark Plugs (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、内燃機開用点火プラグに間し、特にイオン
電流検出用電極を内蔵した内燃機関用点火プラグに関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spark plug for starting an internal combustion engine, and more particularly to a spark plug for an internal combustion engine having a built-in electrode for detecting ionic current.
［従来の技術］
第２図は従来の内燃機関用点火プラグを示す構成図であ
る。図において、（１）は放電により燃焼の火種を作る
中心電極、く２）はこの中心電極（１）に対向して設け
られた接地電極、（３）は中心電極（１）を覆う碍子、
（４）はこの碍子（３）の一部を覆うハウジングであっ
て、このハウジング（４）に接地電極（２）が取り付け
られている。（５）は中心電極（１）の一端に取り付け
られた導電性のターミナルであって、このターミナル（
５）は逆流防止用ダイオード（６）を介して点火コイル
（７）に接続されると共にイオン電流検出用ダイオード
（８）、抵抗器（９）を介して直流電源〈１０）の負電
極に接続される。また、イオン電流検出用ダイオード（
８）のカソード側はコンデンサ（１１）及び抵抗器（１
２）を介して接地される。そしてコンデンサ（１１）と
抵抗器（１２）の接続点より出力端子（１３）が取り出
される。[Prior Art] FIG. 2 is a configuration diagram showing a conventional spark plug for an internal combustion engine. In the figure, (1) is a center electrode that generates combustion sparks by electric discharge, 2) is a ground electrode provided opposite to this center electrode (1), (3) is an insulator that covers the center electrode (1),
(4) is a housing that partially covers this insulator (3), and a ground electrode (2) is attached to this housing (4). (5) is a conductive terminal attached to one end of the center electrode (1), and this terminal (
5) is connected to the ignition coil (7) via a backflow prevention diode (6), and is also connected to the negative electrode of the DC power supply (10) via an ion current detection diode (8) and a resistor (9). be done. In addition, the ion current detection diode (
The cathode side of 8) is a capacitor (11) and a resistor (1).
2). Then, an output terminal (13) is taken out from the connection point between the capacitor (11) and the resistor (12).
次に、第２図に示した従来の内燃機関用点火プラグの動
作について説明する。内燃機関の回転に同期して点火コ
イル（ア）に負の高電圧が発生すると、この負の高電圧
がダイオード（６）を介し゛て中心電１ｔ（１）に供給
され、中心電極（１）と接地電極（２）との間に放電が
発生し、これにより点火プラグが点火する。この点火プ
ラグの点火により図示せずも内燃機間の気筒内の混合気
が燃焼すると、イオン電流が発生し、このイオン電流が
ダイオード（８）を介して出力端子く１３）に検出され
る。Next, the operation of the conventional spark plug for an internal combustion engine shown in FIG. 2 will be explained. When a negative high voltage is generated in the ignition coil (A) in synchronization with the rotation of the internal combustion engine, this negative high voltage is supplied to the center electrode 1t (1) via the diode (6), and the center electrode (1 ) and the ground electrode (2), which causes the spark plug to ignite. When the air-fuel mixture in the cylinder between the internal combustion engines (not shown) is ignited by the ignition of the spark plug, an ion current is generated, and this ion current is detected at the output terminal 13) via the diode (8).
［発明が解決しようとする課題］
従来の内燃線間用点火プラグは以上のように構成され、
イオン電流検出信号の経路と点火高電圧の経路を分離す
るため高耐圧のダイオード（６）、（８）を使用してい
るので、高価となり、また、点火高電圧の経路とイオン
電流検出信号の経路が同一のケーブル（１４）を共用し
、共通のインピーダンスを有するため点火時のノイズが
重なってイオンを涜の信号検出が困難になるという問題
点があった。[Problem to be solved by the invention] The conventional spark plug for internal combustion lines is configured as described above,
High-voltage diodes (6) and (8) are used to separate the ion current detection signal path and the ignition high voltage path, making them expensive. Since the same cable (14) is shared by the same route and the two have a common impedance, there is a problem in that noise at the time of ignition overlaps, making it difficult to detect a signal indicating ion interference.
この発明は上記のような問題点を解決するためになされ
たもので、安価で、イオン電流の検出が点火時のノイズ
に影響されない内燃機関用点火プラグを得ることを目的
とする。The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a spark plug for an internal combustion engine that is inexpensive and in which the detection of ion current is not affected by noise during ignition.
ＥＭＩＭを解決するための手段］
この発明に係る内燃機関用点火プラグは、放電により燃
焼の火種を作る中心電極及び接地電極と、燃焼により生
ずるイオン電流を検出する少なくとも１個の電極とを備
えたものである。Means for Solving EMIM] A spark plug for an internal combustion engine according to the present invention includes a center electrode and a ground electrode that generate a combustion spark through discharge, and at least one electrode that detects an ionic current generated by combustion. It is something.
［作用］
この発明においては、点火プラグ内に燃焼により生ずる
イオンを流を検出する少なくとも１個の電極を組み込み
、イオン電流検出信号の経路を点火高電圧の経路より分
離する。[Operation] In the present invention, at least one electrode for detecting the flow of ions generated by combustion is incorporated into the spark plug, and the path of the ion current detection signal is separated from the path of the ignition high voltage.
［実施例コ
以下、この発明の一実施例を図について説明する。第１
図はこの発明の一実施例を示す構成図であり、（１）〜
（５）、（７）、（９）〜（１３）は前述と同様のもの
である。本実施例では点火プラグ内にイオン電流検出用
電極（２ｏ）を組み込み、その一端が内燃機間の気筒内
に突出するようにする。そして電極（２０）の他端を信
号取り出しリード線（２１）を介して抵抗器（９）及び
コンデンサ（１１）の接続点に接続する。[Example 1] An example of the present invention will be described below with reference to the drawings. 1st
The figure is a configuration diagram showing one embodiment of the present invention, and (1) to
(5), (7), (9) to (13) are the same as described above. In this embodiment, an ion current detection electrode (2o) is built into the spark plug, and one end thereof protrudes into the cylinder between the internal combustion engines. Then, the other end of the electrode (20) is connected to the connection point of the resistor (9) and the capacitor (11) via a signal extraction lead wire (21).
次に、第１図に示したこの発明の一実施例の動作につい
て説明する。内燃機関の回転に同期して点火コイル（７
）に負の高電圧が発生すると、この負の高電圧が直接中
心電極（１）に供給され、中心電極（１）と接地電極（
２）との間にアーク放電が発生し、これにより点火プラ
グが点火する。Next, the operation of the embodiment of the present invention shown in FIG. 1 will be explained. The ignition coil (7
), this negative high voltage is directly supplied to the center electrode (1), and the center electrode (1) and the ground electrode (
2), an arc discharge occurs between the two and the spark plug ignites.
この点火プラグの点火により図示せずも内燃機関の気筒
内の混合気が燃焼すると、イオン電流が発生し、このイ
オン電流が電極（２０）で検出され出力端子（１３）に
検出信号として取りだされる。When the air-fuel mixture in the cylinder of the internal combustion engine (not shown) burns due to the ignition of the spark plug, an ionic current is generated, which is detected by the electrode (20) and output as a detection signal to the output terminal (13). be done.
尚、上記実施例ではイオン電流検出用電極を１個設けた
場合であるが、複数個設けてもよい。In the above embodiment, one ion current detection electrode is provided, but a plurality of electrodes may be provided.
Ｌ発明の効果］
以上のようにこの発明によれば、放電により燃焼の火種
を作る中心電極及び接地電極と、燃焼により生ずるイオ
ン電流を検出する少なくとも１個の電極とを備えたので
、高耐圧のダイオードの使用が不要となって安価となり
、しかもイオン電流検出信号の経路と点火高電圧の経路
とが分離され、点火時のノイズの影響を受けないのでイ
オン電流の信号検出が容易となる内燃機関用点火プラグ
が得られる効果がある。[Effects of the Invention] As described above, according to the present invention, since the center electrode and the ground electrode that generate the spark of combustion by electric discharge and at least one electrode that detects the ionic current generated by the combustion are provided, high withstand voltage can be achieved. Internal combustion technology that eliminates the need to use diodes, making it cheaper, and also makes it easier to detect ion current signals because the ion current detection signal path and ignition high voltage path are separated and are not affected by noise during ignition. This has the effect of providing an engine spark plug.
第１図はこの発明の一実施例を示す構成図、第２図は従
来の内燃線間用点火プラグを示す構成図である。
図において、（１）は中心電極、（２）は接地電極、（
２０）はイオン電流検出用電極である６尚、図中、同一
符号は同−又は相当部分を示す。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional internal combustion line spark plug. In the figure, (1) is the center electrode, (2) is the ground electrode, (
20) is an electrode for detecting ionic current 6. In the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
の電極と を備えたことを特徴とする内燃機関用点火プラグ。[Scope of Claims] A spark plug for an internal combustion engine, characterized by comprising a center electrode and a ground electrode that generate a combustion spark through electric discharge, and at least one electrode that detects an ionic current generated by combustion.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263048A JPH04141977A (en) | 1990-10-02 | 1990-10-02 | Ignition plug for internal combustion engine |
| KR1019910016625A KR950004615B1 (en) | 1990-09-27 | 1991-09-24 | Ignition plug for an internal combustion engine provided with an ionization current detector electrode |
| US07/764,744 US5180983A (en) | 1990-09-27 | 1991-09-24 | Ignition plug for an internal combustion engine provided with an ionization current detector electrode |
| DE4132285A DE4132285C2 (en) | 1990-09-27 | 1991-09-27 | Spark plug with an ionization current detector electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263048A JPH04141977A (en) | 1990-10-02 | 1990-10-02 | Ignition plug for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04141977A true JPH04141977A (en) | 1992-05-15 |
Family
ID=17384139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2263048A Pending JPH04141977A (en) | 1990-09-27 | 1990-10-02 | Ignition plug for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04141977A (en) |
-
1990
- 1990-10-02 JP JP2263048A patent/JPH04141977A/en active Pending
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