JPS6114535A - Pressure detecting device - Google Patents
Pressure detecting deviceInfo
- Publication number
- JPS6114535A JPS6114535A JP13482184A JP13482184A JPS6114535A JP S6114535 A JPS6114535 A JP S6114535A JP 13482184 A JP13482184 A JP 13482184A JP 13482184 A JP13482184 A JP 13482184A JP S6114535 A JPS6114535 A JP S6114535A
- Authority
- JP
- Japan
- Prior art keywords
- pressure sensor
- guide member
- ignition plug
- cylinder head
- outer periphery
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 abstract description 9
- 210000000078 claw Anatomy 0.000 abstract 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 8
- 239000000446 fuel Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
- G01L23/10—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by pressure-sensitive members of the piezoelectric type
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (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燃焼圧力の検出装置に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a combustion pressure detection device for an internal combustion engine.
（従来の技術）
内燃機関の燃費や出力の向上を図るうえで、実際の燃焼
状態を把握することは極めて有意義であり、たとえぼ燃
焼に重大な関係をもつ点火時期を燃焼状態に応じてフィ
ードバック制御することにより、ノッキングを回避しつ
つ最良燃費、出力を発生させることができる。(Conventional technology) In order to improve the fuel efficiency and output of internal combustion engines, it is extremely meaningful to understand the actual combustion state. By controlling the engine, it is possible to generate the best fuel efficiency and output while avoiding knocking.
燃焼状態を把握する方法として、シリンダ内での燃焼ガ
ス圧力を検出することがよく行なわれており、そのため
の手段として従来、たとえば第６図〜第８図に示すよう
なものが知られている（特公昭４１−５１５４号公報、
ＳＡＥテクニカルペーパー７５０８８３等）。Detecting the combustion gas pressure within the cylinder is often used as a method of determining the combustion state, and conventionally known means for this purpose include those shown in FIGS. 6 to 8. (Special Publication No. 41-5154,
SAE Technical Paper 750883, etc.).
シリンダヘッド１０に設けた点火栓ネジ孔１１には、点
火栓１２が螺合されるが、その際点火栓１２と取付座面
１４との間に座金としての圧力センサ１５を挟み込んで
共締めする。The ignition plug 12 is screwed into the ignition plug screw hole 11 provided in the cylinder head 10. At this time, a pressure sensor 15 as a washer is inserted between the ignition plug 12 and the mounting seat surface 14, and then they are tightened together. .
圧力センサ１５はリング型の中心電極１６を中心にして
その両面に２枚のピエゾ圧電索子１７と、さらにその外
側に上面電極１８と下面電極１９を順次積層したもので
、これらの内外周を絶縁性のモールド部材２０で一体に
固定しである。The pressure sensor 15 has a ring-shaped center electrode 16 at its center, two piezoelectric cords 17 on both sides, and an upper electrode 18 and a lower electrode 19 on the outside of the ring-shaped central electrode 16. They are fixed together with an insulating mold member 20.
中心電極１６からはリード線２１がモールド部材２０を
通して取り出される。A lead wire 21 is taken out from the center electrode 16 through the mold member 20.
圧力センサ１５は点火栓１２の座金として締め付けられ
ているため、シリンダ内の燃焼圧力が点火栓１２に作用
すると、その締付力が増減変化し、これにより圧電素子
１７の発生電荷が燃焼圧力に応じて変化するのである９
このようにして内燃機関の燃焼圧力を電気的信号として
正確に取り出すことかで外るのである。Since the pressure sensor 15 is tightened as a washer for the ignition plug 12, when the combustion pressure in the cylinder acts on the ignition plug 12, the tightening force increases or decreases, and as a result, the electric charge generated by the piezoelectric element 17 changes to the combustion pressure. In this way, the combustion pressure of the internal combustion engine can be accurately extracted as an electrical signal.
（発明が解決しようとする問題点）
しかしながらこの場合、圧力センサ１５は点火栓１２を
取り外すときに一緒に外れやすく、また点火栓１２を締
め付ける際に圧力センサ１５が回ってリード線２１を損
傷することもあり、あるいは下面電極１９を取付座面１
４に対して完全に接触させにくく、とくにこれらは点火
栓１２の取付座面１４までの深さが深いほど顕着な問題
としてあられれる。(Problems to be Solved by the Invention) However, in this case, the pressure sensor 15 tends to come off when the spark plug 12 is removed, and the pressure sensor 15 turns when the spark plug 12 is tightened, damaging the lead wire 21. Alternatively, the lower electrode 19 may be attached to the mounting surface 1.
It is difficult to make complete contact with the spark plug 12, and this problem becomes more serious as the depth of the spark plug 12 to the mounting surface 14 increases.
またリードａ２１は点火栓１２の７α火ノイズを拾いや
すく、正確な燃焼圧力の測定に支障をきたすことがあっ
た。In addition, the lead a21 tends to pick up 7α noise from the spark plug 12, which sometimes interferes with accurate measurement of combustion pressure.
（問題点を解決するための手段）
本発明は、シリンダヘッドに螺合する点火栓の取付座面
に、リング型の圧力センサを挟み込み、この圧力センサ
の出力にょリシリンダ内圧を測定するようにした内燃機
関の圧力検出装置において、前記圧力センサの外周に円
筒状のガイド部材を結合し、このガイド部材をシリンダ
ヘッドの７α火栓挿入孔に挿入保持し、このガイド一部
材を介して圧力センサをシリンダヘッドに固定する。(Means for Solving the Problems) The present invention has a ring-shaped pressure sensor inserted between the mounting surface of the ignition plug that is screwed into the cylinder head, and the output of this pressure sensor measures the internal pressure of the cylinder. In a pressure detection device for an internal combustion engine, a cylindrical guide member is coupled to the outer periphery of the pressure sensor, this guide member is inserted and held in a 7α fire plug insertion hole of the cylinder head, and the pressure sensor is inserted through this guide member. Fix it to the cylinder head.
（作用）
シタ力って５．σ大検を着脱する際に圧力センサが回転
することがなく、また圧力センサを確実に取付座面に接
触させられる。(Function) Shita force is 5. The pressure sensor does not rotate when attaching and detaching the σ Daiken, and the pressure sensor can be securely brought into contact with the mounting seat surface.
（実施例）
以下本発明の第１実施例を！＠１図〜第４図にもとづい
て説明する。(Example) Below is a first example of the present invention! The explanation will be based on Figures 1 to 4.
圧力センサ１５の外周には円筒状のガイド部材３０が嵌
合される。ガイド部材３ｏは金Ｒ板をプレス成型したも
ので、シリンダへンド１ｏに形成した点火栓挿入孔３１
に挿入支持される。A cylindrical guide member 30 is fitted around the outer periphery of the pressure sensor 15 . The guide member 3o is press-molded from a metal R plate, and is inserted into the spark plug insertion hole 31 formed in the cylinder head 1o.
It is supported when inserted.
がイド部材３０は下部が絞り込まれた段付部３２となっ
ており、この段付部３２には圧力センサ１５の挿入を容
易にするため、スリット３３が形成しである。圧力セン
サ１５は段付８％３２に挿入保持され、かっガイド部材
３０の周面に内方に向けて切り起こした係止爪３４によ
り、」二下方向の位置決めがなされる。The guide member 30 has a stepped portion 32 with a narrowed lower portion, and a slit 33 is formed in the stepped portion 32 to facilitate insertion of the pressure sensor 15. The pressure sensor 15 is inserted and held in the stepped 8% 32, and is positioned in the downward direction by a locking pawl 34 cut and raised inward on the circumferential surface of the hook guide member 30.
ガイド部材３０の外周には複数の突起３５が設けられ、
シリンダヘッド１０の点火栓挿入孔３１に対する嵌合が
きっちりと行なわれるようにする。A plurality of protrusions 35 are provided on the outer periphery of the guide member 30,
The cylinder head 10 is tightly fitted into the spark plug insertion hole 31.
ガイド部材３０の上部外周には、ゴム等の密着性のよい
材料で作られた円筒状のシール部材３６が嵌合される。A cylindrical seal member 36 made of a material with good adhesiveness, such as rubber, is fitted onto the upper outer periphery of the guide member 30 .
シール部材３Ｇの内周環状溝３８には、がイド部材３０
の上部外周に切り起こした係止爪３７が弾性接触し、シ
ール部材３６がガイド部材３０に対して軸方向に微摺動
可能になっている。The inner circumferential annular groove 38 of the sealing member 3G has a gap-like member 30.
A locking pawl 37 cut and raised on the outer periphery of the upper part makes elastic contact with the sealing member 36 so that the sealing member 36 can slightly slide relative to the guide member 30 in the axial direction.
点火栓１２はガイド部材３０の内部に挿入され、圧力セ
ンサ１５に対してガスケット３９を介して接触した状態
で、点火栓ネジ孔１１にしっかりと螺合される。The ignition plug 12 is inserted into the guide member 30 and firmly screwed into the ignition plug threaded hole 11 while in contact with the pressure sensor 15 via the gasket 39.
点火栓１２の上部にはプラグブーツ４０が嵌合され、こ
のと鰺プラグブーツ４０に形成した７ランノ部４１が前
記シール部材３６の上端に全周的に密着する。一方、シ
ール部材３６の下端は、シリンダヘッド１０の点火栓挿
入孔３１のボス＠１ｓ４２に全周的に密着し、これによ
り点火栓１２の付近つまりガイド部材３０の内外周に、
外部から雨水等が侵入するのを確実に防いでいる。A plug boot 40 is fitted into the upper part of the ignition plug 12, and a seven-run section 41 formed on the plug boot 40 is in close contact with the upper end of the sealing member 36 all around. On the other hand, the lower end of the sealing member 36 is in close contact with the boss @1s42 of the ignition plug insertion hole 31 of the cylinder head 10 all around, and as a result, near the ignition plug 12, that is, on the inner and outer peripheries of the guide member 30,
It reliably prevents rainwater etc. from entering from the outside.
圧力センサ１５は前述したものと実質的に同一に構成さ
れるが、中心電極１６に接続さレルリード線２１には保
護チューブ４３が嵌められたうえ、前記ガイド部材３０
の外周に設けられた止め兵４４に掛止され、この延長端
は前記シール部材３６に設けたリード線取出孔４５を気
密的に貫通して外部に取り出される。The pressure sensor 15 has substantially the same structure as that described above, but a protective tube 43 is fitted to the parallel lead wire 21 connected to the center electrode 16, and the guide member 30 is fitted with a protective tube 43.
The extended end of the seal member 36 is hooked to a stopper 44 provided on the outer periphery of the seal member 36, and the extended end thereof is taken out to the outside through a lead wire take-out hole 45 provided in the seal member 36 in an airtight manner.
なお、シリンダヘッド１０の点火栓挿入孔３１の一部に
は、リード線２１を導く縦溝４６が形成されており、前
記シール部材３６は縦溝４６の上端を覆うように、この
部分が膨出している。Note that a vertical groove 46 for guiding the lead wire 21 is formed in a part of the ignition plug insertion hole 31 of the cylinder head 10, and the sealing member 36 expands in this part so as to cover the upper end of the vertical groove 46. It's out.
以上のように構成したので、圧力センサ１′５は円筒状
のガイド部材３０と一体になり、ガイド部材３０をシリ
ンダヘッド１０の点火栓挿入孔３１に挿入することによ
り、取付座面１４に対して下面電極１９が正しく密着さ
せられる。この後、α火粉１２をガイド部材３０の内部
に挿入して点火栓ネジ孔１１に螺合するのであるが、こ
のときガイド部材３０は点火栓挿入孔３１にしっがりと
保持されているため、点火栓１２の締め付けに伴って圧
力センサ１５が回転することもない。With the above structure, the pressure sensor 1'5 is integrated with the cylindrical guide member 30, and by inserting the guide member 30 into the spark plug insertion hole 31 of the cylinder head 10, the pressure sensor 1'5 can be attached to the mounting seat surface 14. The lower surface electrode 19 can be brought into close contact with the lower surface electrode 19 properly. After this, the α powder 12 is inserted into the guide member 30 and screwed into the ignition plug screw hole 11, but at this time, the guide member 30 is firmly held in the ignition plug insertion hole 31. , the pressure sensor 15 does not rotate as the spark plug 12 is tightened.
そして点火栓１２にプラグブーツ４０を嵌めると、７ラ
ンノ部４１がシール部材３６の上端に密着し、かつシー
ル部材３６の下端がシリンダヘッド１０のボス部４２に
密着するため、外部からの雨水等の侵入を確実に防止で
きる。When the plug boot 40 is fitted to the spark plug 12, the seven-run no. 41 comes into close contact with the upper end of the seal member 36, and the lower end of the seal member 36 comes into close contact with the boss part 42 of the cylinder head 10, so that rainwater from the outside etc. It is possible to reliably prevent the intrusion of
次に第５図の実施例を説明すると、これは圧力センサ１
５のモールド部材２０に対してガイド部材３０の下端を
一体に埋め込んだものである。このようにすると、圧力
センサ１５とガイド部材３０が外れることがなく、取り
扱いが容易になる。Next, the embodiment shown in FIG. 5 will be explained. This is the pressure sensor 1.
The lower end of the guide member 30 is integrally embedded in the mold member 20 of No. 5. In this way, the pressure sensor 15 and the guide member 30 will not come off, making handling easier.
同様のことは、図示はしないが、前記第１の実施例にお
いで圧力センサ１５とガイド部材３０を嵌合の後接着し
たり、あるいは圧力センサ１５のモールド部材２０を金
属としてガイド部材３０とスポット溶接等により固着し
てもよい。ただしこの場合は、モールド部材２０と中心
電極１６及び圧電素子１７との間を絶縁する必要がある
。Although not shown, in the first embodiment, the pressure sensor 15 and the guide member 30 may be bonded together after they are fitted, or the mold member 20 of the pressure sensor 15 may be made of metal and the guide member 30 and the guide member 30 may be bonded together. It may be fixed by welding or the like. However, in this case, it is necessary to insulate between the mold member 20, the center electrode 16, and the piezoelectric element 17.
（発明の効果）
以上のように本発明によれば、シリンダヘッドの点火栓
挿入孔に挿入保持されるガイド部材に圧力センサを結合
したため、点火栓挿入孔が深くても圧力センサの装着性
がよく、その位置決めも容易に行うことができ、また点
火栓の着脱時に圧力センサが回転したり外れたりするこ
とがなく、シかも下面電極は取付座面に対して確実に接
触させることができ、さらにリード線はガイド部材によ
りてシールドされるので点火ノイズの影響を受けず
たに、常に正確な出力を取り出すことができ
る。(Effects of the Invention) As described above, according to the present invention, since the pressure sensor is coupled to the guide member that is inserted and held in the spark plug insertion hole of the cylinder head, the pressure sensor can be attached easily even if the spark plug insertion hole is deep. In addition, the pressure sensor does not rotate or come off when the spark plug is attached or removed, and the lower electrode can be securely brought into contact with the mounting seat. Furthermore, the lead wire is shielded by the guide member, so it is not affected by ignition noise.
As a result, you can always get accurate output.
第１図は本発明の第１実施例の断面図、第２図も同じく
断面図、第３図はセンサ部分の拡大断面図、第４図はガ
イド部材の側面図、第５図はＭｔＪ２実施例の断面図、
第６図は従来例の断面図、第７図は同じくセンサ部分の
断面図、第８図はその平面図である。
１０・・・シリンダヘッド、１１・・・点火栓ネジ孔、
１２・・・７点火栓、１４・・・取付座面、１５・・・
圧力センサ、１６・・・中心電極、１７・・・圧電素子
、１８・・・上面電極、１９・・・下面電極、２０・・
・モールド部材、２１・・・リード線、３０・・・ガイ
ド部材、３１・・・点火栓挿入孔、３２・・・段付部、
３５・・・突起、３６・・・シール部材、４０・・・プ
ラグブーツ、４１・・・７ランノ部、４２・・・ボス部
、４３・・・保護チューブ、４５・・・リード線取出孔
、４６・・・縦溝。
特許出願人 日産自動車株式会社代理人 弁理士
後 藤 政 喜 □、−；
第１図
第２図
第４ 図Fig. 1 is a sectional view of the first embodiment of the present invention, Fig. 2 is also a sectional view, Fig. 3 is an enlarged sectional view of the sensor portion, Fig. 4 is a side view of the guide member, and Fig. 5 is the MtJ2 implementation. Example cross section,
FIG. 6 is a sectional view of the conventional example, FIG. 7 is a sectional view of the sensor portion, and FIG. 8 is a plan view thereof. 10... Cylinder head, 11... Ignition plug screw hole,
12...7 spark plug, 14...mounting seat, 15...
Pressure sensor, 16... Center electrode, 17... Piezoelectric element, 18... Top surface electrode, 19... Bottom surface electrode, 20...
- Mold member, 21... Lead wire, 30... Guide member, 31... Spark plug insertion hole, 32... Stepped part,
35...Protrusion, 36...Sealing member, 40...Plug boot, 41...7 run part, 42...Boss part, 43...Protection tube, 45...Lead wire extraction hole , 46... vertical groove. Patent Applicant Nissan Motor Co., Ltd. Agent Patent Attorney Masaki Goto □, -; Figure 1 Figure 2 Figure 4
Claims (1)
型の圧力センサを挟み込み、この圧力センサの出力によ
りシリンダ内圧を測定するようにした内燃機関の圧力検
出装置において、前記圧力センサの外周に円筒状のガイ
ド部材を結合し、このガイド部材をシリンダヘッドの点
火栓挿入孔に挿入保持し、このガイド部材を介して圧力
センサをシリンダヘッドに固定することを特徴とする圧
力検出装置。In a pressure detection device for an internal combustion engine, a ring-shaped pressure sensor is sandwiched between the mounting surface of an ignition plug that is screwed into the cylinder head, and the cylinder internal pressure is measured by the output of this pressure sensor. A pressure detection device comprising: a cylindrical guide member coupled to the cylinder head; the guide member inserted into and held in a spark plug insertion hole of a cylinder head; and a pressure sensor fixed to the cylinder head via the guide member.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13482184A JPS6114535A (en) | 1984-06-29 | 1984-06-29 | Pressure detecting device |
| US06/749,100 US4602506A (en) | 1984-06-29 | 1985-06-26 | Combustion pressure sensor arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13482184A JPS6114535A (en) | 1984-06-29 | 1984-06-29 | Pressure detecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6114535A true JPS6114535A (en) | 1986-01-22 |
| JPH0324977B2 JPH0324977B2 (en) | 1991-04-04 |
Family
ID=15137261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13482184A Granted JPS6114535A (en) | 1984-06-29 | 1984-06-29 | Pressure detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6114535A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2849192A1 (en) * | 2002-12-20 | 2004-06-25 | Siemens Vdo Automotive | Equipment for detecting the pressure in an engine combustion chamber, comprises functional component fixed to cylinder head with assistance of intermediate element which includes pressure detector |
-
1984
- 1984-06-29 JP JP13482184A patent/JPS6114535A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2849192A1 (en) * | 2002-12-20 | 2004-06-25 | Siemens Vdo Automotive | Equipment for detecting the pressure in an engine combustion chamber, comprises functional component fixed to cylinder head with assistance of intermediate element which includes pressure detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0324977B2 (en) | 1991-04-04 |
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