JPH0434327A - Combustion pressure sensor - Google Patents
Combustion pressure sensorInfo
- Publication number
- JPH0434327A JPH0434327A JP14077090A JP14077090A JPH0434327A JP H0434327 A JPH0434327 A JP H0434327A JP 14077090 A JP14077090 A JP 14077090A JP 14077090 A JP14077090 A JP 14077090A JP H0434327 A JPH0434327 A JP H0434327A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- diaphragm
- combustion
- combustion chamber
- washer member
- 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 51
- 239000012212 insulator Substances 0.000 claims description 18
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 10
- 229910001120 nichrome Inorganic materials 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 description 7
- 230000004043 responsiveness Effects 0.000 description 5
- 238000005219 brazing Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 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
- G01L23/221—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 for detecting or indicating knocks in internal combustion engines
- G01L23/222—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 for detecting or indicating knocks in internal combustion engines using piezoelectric devices
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、燃焼室内の圧力を測定する燃料圧力センサに
関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a fuel pressure sensor that measures pressure within a combustion chamber.
〈従来の技術〉
内＊ｓｎの燃焼室内の燃焼圧力を測定する燃焼圧力セン
サとしては、第４図に示したものが知られている。（実
公昭４０−１６４８４号公報参照）。７０は点火プラグ
であり、雄ねじ部７１で内燃機関のシリンダヘッドに取
り付けられる。<Prior Art> As a combustion pressure sensor for measuring the combustion pressure within the combustion chamber of *sn, the one shown in FIG. 4 is known. (Refer to Utility Model Publication No. 40-16484). Reference numeral 70 denotes a spark plug, which is attached to a cylinder head of an internal combustion engine by a male threaded portion 71.
７９は波形ダイヤフラムであり、７５は薄肉シリンダで
ある。薄肉シリンダ７５の内側には軸方向の歪みを検知
する歪みケージ７４が設けられる。79 is a corrugated diaphragm, and 75 is a thin-walled cylinder. A strain cage 74 is provided inside the thin-walled cylinder 75 to detect strain in the axial direction.
また、薄肉シリンダ７５の外側には、絶縁体７３を介し
て周方向の歪みを検出する歪みゲージ７２が設けられて
いる。歪みゲージ７２．−７４は図示しないホイートス
トンブリッジ回路に接続されている。Furthermore, a strain gauge 72 is provided on the outside of the thin cylinder 75 to detect strain in the circumferential direction via an insulator 73. Strain gauge 72. -74 is connected to a Wheatstone bridge circuit (not shown).
内燃機関が動作しているとき、燃焼室内で発生した燃焼
圧力は波形ダイヤフラム７９に伝えられる。波形ダイヤ
フラム７９は圧力によって変形し、この変形量に応じて
薄肉シリンダ７５が歪む。そして、薄肉シリンダ７５の
歪みは、歪みゲージ７２．７４に接続されたホイートス
トンブリッジ回路によって検出される。以上のようにし
て、燃焼室内の圧力の変化を電気信号として取り出すこ
とができる。When the internal combustion engine is operating, the combustion pressure generated within the combustion chamber is transferred to the corrugated diaphragm 79. The corrugated diaphragm 79 is deformed by the pressure, and the thin-walled cylinder 75 is deformed in accordance with the amount of this deformation. The strain in the thin-walled cylinder 75 is then detected by a Wheatstone bridge circuit connected to strain gauges 72,74. In the manner described above, changes in the pressure within the combustion chamber can be extracted as electrical signals.
また、特開平１−２９６１３０号公報には、第５図の燃
焼圧力センサが示されている。８１は金属製の筒部であ
り、一方の端部に圧力導入口８２が設けられている。ま
た、筒部８１は、雄ねじ部８３により、燃焼室を囲むシ
リンダヘッド２０に設置されている。８７はダイヤフラ
ムであり、筒部８１と一体に成型される。８８はダイヤ
フラム８７の圧力導入口８２と反対側の表面にスパッタ
リングにより形成される歪抵抗素子である。８６はセン
サ回路であり、リード線８５によって歪抵抗素子８８と
接続されている。また、センサ回路８６の出力端子には
コード８９が接続される。Furthermore, Japanese Patent Laid-Open No. 1-296130 discloses a combustion pressure sensor shown in FIG. 5. 81 is a metal cylindrical portion, and a pressure introduction port 82 is provided at one end. Further, the cylindrical portion 81 is installed in the cylinder head 20 surrounding the combustion chamber by a male threaded portion 83. 87 is a diaphragm, which is molded integrally with the cylindrical portion 81. 88 is a strain resistance element formed by sputtering on the surface of the diaphragm 87 opposite to the pressure introduction port 82. A sensor circuit 86 is connected to the strain resistance element 88 by a lead wire 85. Further, a cord 89 is connected to the output terminal of the sensor circuit 86.
上記構成によると、燃焼の圧力は圧力導入口８２から筒
部８１内部に伝わり、ダイヤフラム８７に達する。この
圧力によってダイヤフラム８７が変形し、同時にダイヤ
フラム８７に形成されたｆ抵抗素子８８も変形する。そ
して、歪抵抗素子８８が変形すると、歪抵抗素子８８の
抵抗値が変化し、センサ回路８６によって抵抗値の変化
が検出される。さらに、センサ回路８６は歪抵抗素子８
８の抵抗値の変化を電気的に処理した後、電気信号を出
力端子からコード８９を通して出力する０以上のように
して、燃焼室内の圧力の変化を電気信号として取り出す
ことができる。According to the above configuration, the combustion pressure is transmitted from the pressure introduction port 82 to the inside of the cylindrical portion 81 and reaches the diaphragm 87. This pressure causes the diaphragm 87 to deform, and at the same time the f resistance element 88 formed on the diaphragm 87 also deforms. When the strain resistance element 88 deforms, the resistance value of the strain resistance element 88 changes, and the change in resistance value is detected by the sensor circuit 86. Further, the sensor circuit 86 is connected to the strain resistance element 8
After electrically processing the change in the resistance value of 8, the change in the pressure inside the combustion chamber can be extracted as an electric signal by outputting the electric signal from the output terminal through the cord 89.
〈発明が解決しようとする課題〉
しかしながら、第４図に示した装置によると、燃焼の圧
りによる波形ダイヤフラム７９の変形量は一旦、薄肉シ
リンダ７５の歪みに変換された後で、電気信号として検
出されるようｋなっていた。<Problems to be Solved by the Invention> However, according to the device shown in FIG. 4, the amount of deformation of the corrugated diaphragm 79 due to the pressure of combustion is converted into distortion of the thin-walled cylinder 75, and then converted into an electrical signal. It was set to be detected.
そのため、圧力に対する波形ダイヤフラム７９の変形量
もしくは薄肉シリンダ７５の歪み量の温度依存性、損失
による感変の低下、製造バラツキ等によって、燃焼の圧
力と電気信号との間に１対１の関係が成立しなくなる。Therefore, due to the temperature dependence of the amount of deformation of the corrugated diaphragm 79 or the amount of distortion of the thin-walled cylinder 75 with respect to pressure, the reduction in sensitivity due to loss, manufacturing variations, etc., there is a one-to-one relationship between the combustion pressure and the electrical signal. It will no longer be established.
その結果として、測定誤差が大きくなってしまう。さら
に、燃焼室から波形ダイヤフラム７９までの距離が長い
ため、センサとしての応答性が損われるという問題点が
あった。As a result, measurement errors become large. Furthermore, since the distance from the combustion chamber to the corrugated diaphragm 79 is long, there is a problem in that the responsiveness of the sensor is impaired.
また、第５図の装置によると、歪抵抗素子８８を正常に
動作する温度範囲は２５０［”Ｃ］以下である。従って
、燃焼の圧力を正しく検出するために歪抵抗素子８８も
しくはダイヤフラム８７付近を２５０［’Ｃ］以下に冷
却する必要があった。その結果、燃焼室とダイヤフラム
８７との距離が長くなってしまい、センサとしての応答
性を損うという問題点があった。Further, according to the device shown in FIG. 5, the temperature range in which the strain resistance element 88 normally operates is 250[''C] or lower. Therefore, in order to correctly detect the combustion pressure, It was necessary to cool the diaphragm 87 to below 250['C].As a result, the distance between the combustion chamber and the diaphragm 87 became long, which caused a problem in that the responsiveness of the sensor was impaired.
本発明は、上記問題点に鑑みて為されたものであり、測
定誤差が少なく、応答性に優れた燃焼圧力センサを提供
することを目的とする。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a combustion pressure sensor with less measurement error and excellent responsiveness.
〈課題を解決するための手段〉
本発明は、中心電極の周囲に形成された絶縁体と、側方
電極と電気的に接続され、前記絶縁体の周囲に形成され
る座金部材と、を有する点火プラグに内蔵された燃焼圧
力センサにおいて、前記絶縁体および前記座金部材の藺
であり、かつ前記中心電極および前記側方電極の間の点
火ギャップ近傍に設置されたニオブ酸リチウムからなる
圧電素子と、を備えることを特徴とする。<Means for Solving the Problems> The present invention includes an insulator formed around a center electrode, and a washer member electrically connected to the side electrodes and formed around the insulator. A combustion pressure sensor built into a spark plug includes a piezoelectric element made of lithium niobate, which is part of the insulator and the washer member, and is installed near the ignition gap between the center electrode and the side electrodes. It is characterized by comprising the following.
〈作用〉
点火プラグは、内燃機関の燃焼室に取り付けられる。燃
焼室内における燃焼の圧力は、点火プラグの絶縁体およ
び座金部材の間であり、かつ前記中心電極および前記側
方電極の門の点火ギヤツブｉ傍に設置されたニオブ酸リ
チウムからなる圧電素子に伝わる。この圧力によって、
圧電素子が変形し、電気信号を出力する。そして、この
電気信号を検出することによって、燃焼の圧力が測定さ
れる。また、本発明装置が内ｍ機関に取り付けられた時
、圧電素子の設＠位置は燃焼室近傍となるため、センサ
としての応答性が向上する。さらに、燃焼の圧力によっ
て生じた圧電素子の変形量は、他の物量的な変位量に変
換されることなく、電気信号として検出される。<Operation> A spark plug is attached to the combustion chamber of an internal combustion engine. The combustion pressure in the combustion chamber is transmitted to a piezoelectric element made of lithium niobate, which is located between the insulator and the washer member of the spark plug and is installed near the ignition gear lug of the gate of the center electrode and the side electrode. . This pressure causes
The piezoelectric element deforms and outputs an electrical signal. The combustion pressure is then measured by detecting this electrical signal. Further, when the device of the present invention is installed in an internal engine, the piezoelectric element is located near the combustion chamber, so that the response as a sensor is improved. Furthermore, the amount of deformation of the piezoelectric element caused by the pressure of combustion is detected as an electrical signal without being converted into any other amount of physical displacement.
なお、圧電素子が設置される位置は、燃１ｊ２時にはお
よそ３５０［”Ｃ］の高温になるが、ニオブ酸リチウム
が圧電性を失うキュリー温度は１２１０［’Ｃ］とざら
に高温である。そのため、ニオブ酸リチウムが圧電性を
失うことなく、燃焼の圧力を検出することができる。Note that the location where the piezoelectric element is installed is at a high temperature of approximately 350 ['C] at the time of combustion, but the Curie temperature at which lithium niobate loses its piezoelectricity is much higher at 1210 ['C]. , the pressure of combustion can be detected without lithium niobate losing its piezoelectricity.
〈実施例〉
第１図から第３図に基づいて、本発明の実施例について
説明する。第１図において、１０は点火プラグである。<Example> An example of the present invention will be described based on FIGS. 1 to 3. In FIG. 1, 10 is a spark plug.
１１は点火プラグ１０の中心電極である。１２は中心電
極１１の周囲に形成されたセラミック製の絶縁体である
。１３は絶縁体１２の周囲に形成された金属製の座金部
材であり、方の端部の外縁に雄ねじ部１５が形成されて
いる。11 is the center electrode of the spark plug 10. 12 is a ceramic insulator formed around the center electrode 11. Reference numeral 13 denotes a metal washer member formed around the insulator 12, and a male threaded portion 15 is formed at the outer edge of one end.
点火プラグ１０は雄ねじ部１５によって、燃焼室を囲む
シリンダヘッド２０に取り付けられる。The spark plug 10 is attached by a male thread 15 to a cylinder head 20 surrounding a combustion chamber.
１４は側方電極であり、座金部材１３に固定されるとと
もに、座金部材１３と電気的に接続されている。１はリ
ング状の圧ツノ検知部材であり、絶縁に設置されている
。そのため、点火プラグ１０がシリンダヘッド２０に取
り付けられたとき、圧力検知部材１は燃焼室近傍に設置
されることになる。14 is a side electrode, which is fixed to the washer member 13 and electrically connected to the washer member 13. Reference numeral 1 denotes a ring-shaped pressure horn detection member, which is installed insulated. Therefore, when the spark plug 10 is attached to the cylinder head 20, the pressure detection member 1 is installed near the combustion chamber.
５はニクロム線であり、アルミナなどのセラミックス材
料からなる管に覆われている。ニクロム線５によって、
圧力検知部材１とセンサ回路（図示省略）とが接続され
る。5 is a nichrome wire, which is covered with a tube made of a ceramic material such as alumina. By nichrome wire 5,
The pressure sensing member 1 and a sensor circuit (not shown) are connected.
次に、第２図に圧力検知部材１の断面斜視図を示す。図
中、２はニオブ酸リチウム単結晶からなるリング状の圧
電素子である。圧電素子２は厚み方向（図中の矢印Ａ）
に分極されている。７および８はｉｌｌ状の電極であり
、圧電素子２０両側の底面にＮｉにッケル）などの金属
材料をスパッタリングすることによって形成される。３
はリング状のダイヤフラムであり、電極８を介して圧電
素子２にアルミニウム系ろう材４によってろう付けされ
ている。なお、ダイヤフラム３は、絶縁体１２および座
金部材１３に接する形状となっている。また、圧電素子
２の内径はダイヤフラム３の内径に等しく、外径はダイ
ヤフラム３の外径よりも小さくなっている。Next, FIG. 2 shows a cross-sectional perspective view of the pressure sensing member 1. In the figure, 2 is a ring-shaped piezoelectric element made of lithium niobate single crystal. Piezoelectric element 2 is in the thickness direction (arrow A in the figure)
is polarized. 7 and 8 are ill-shaped electrodes, which are formed by sputtering a metal material such as Ni (nickel) on the bottom surface of both sides of the piezoelectric element 20. 3
is a ring-shaped diaphragm, which is brazed to the piezoelectric element 2 via an electrode 8 with an aluminum brazing material 4. Note that the diaphragm 3 is shaped to be in contact with the insulator 12 and the washer member 13. Further, the inner diameter of the piezoelectric element 2 is equal to the inner diameter of the diaphragm 3, and the outer diameter is smaller than the outer diameter of the diaphragm 3.
上記の圧力検知部材１の設置部分を、第３図を用いてさ
らに詳しく説明する。圧力検知部材１を座金部材１３と
絶縁物１２の間に挿入すると、ダイヤフラム３は所定位
置で座金部材１３と絶縁物１２に接する。この位置で、
円周状にアルミニウム系ろう材６でろう付けを施し、圧
力検知部材１と点火プラグ１０を固定する。以上によっ
て、圧電素子の一方の底面は、電極８、ダイヤフラム３
、座金部材１３、シリンダヘッド２０を介して車体に接
地される。また、電極７にはニクロム線５がろう付けに
よって接続され、圧電素子２から発生する電圧信号が取
り出される。The installation portion of the pressure sensing member 1 described above will be explained in more detail using FIG. 3. When the pressure sensing member 1 is inserted between the washer member 13 and the insulator 12, the diaphragm 3 contacts the washer member 13 and the insulator 12 at a predetermined position. At this position,
The pressure sensing member 1 and the spark plug 10 are fixed by brazing with an aluminum brazing material 6 in a circumferential manner. With the above, one bottom surface of the piezoelectric element is connected to the electrode 8 and the diaphragm 3.
, the washer member 13, and the cylinder head 20, and are grounded to the vehicle body. Further, a nichrome wire 5 is connected to the electrode 7 by brazing, and a voltage signal generated from the piezoelectric element 2 is extracted.
次に、上記の装置の作用を説明する。燃焼室内の燃焼の
圧力は、点火プラグ１０の絶縁体１２および座金部材１
３を押し上げるように作用するとともに、絶縁体１２と
座金部材１３との間に伝搬される。この圧力はダイヤフ
ラム３にも伝わり、ダイヤフラム３を押し上げるような
応力が加えられる。この圧力によってダイヤフラム３が
変形し、同時にダイヤプラム３に固定された圧電素子２
も変形する。圧電素子２は厚み方向に分極されているた
め、電極７及び８の間で電圧を発生する。このとき、電
極７の電圧がニクロム線５によって取り出され、センサ
回路（図示省略）によって検出される。この電圧を電気
的に処理することにより、燃焼室内の圧力を直接検出す
ることができる。Next, the operation of the above device will be explained. The combustion pressure in the combustion chamber is increased by the insulator 12 of the spark plug 10 and the washer member 1.
3 and is propagated between the insulator 12 and the washer member 13. This pressure is also transmitted to the diaphragm 3, and stress is applied to push the diaphragm 3 up. This pressure deforms the diaphragm 3, and at the same time the piezoelectric element 2 fixed to the diaphragm 3
It also transforms. Since the piezoelectric element 2 is polarized in the thickness direction, a voltage is generated between the electrodes 7 and 8. At this time, the voltage of the electrode 7 is taken out by the nichrome wire 5 and detected by a sensor circuit (not shown). By electrically processing this voltage, the pressure inside the combustion chamber can be directly detected.
なお、本実施例装置に圧電素子２と使用している物質は
ニオブ酸リチウムの単結晶である。ニオブ酸リチウムの
単結晶のキュリー温度（圧電性を失う温度）は１２１０
［’Ｃ］と高温であり、１０００［”０１以上の高温環
境中でも正常に圧電性を示す。また、単結晶であるため
、壁界面からの素子の破壊が考えられるが、およそ５５
０ ［”Ｃ］以下の温度環境下においては、壁界面の劣
化はほとんど生じない。一方、内燃ｌｌ！閏の動作中、
圧力検出部材１付近の温度はおよそ３５０ ［’Ｃ］で
ある。従って、特に圧力検知部材１を冷却する手段を講
じなくとも、圧電素子２を劣化させることなく燃焼の圧
力を検出することができる。The material used for the piezoelectric element 2 in the device of this embodiment is a single crystal of lithium niobate. The Curie temperature (temperature at which piezoelectricity is lost) of a single crystal of lithium niobate is 1210
['C] and shows normal piezoelectricity even in high-temperature environments of 1000 ['01 or higher.Also, since it is a single crystal, it is possible that the element may be destroyed from the wall interface, but
In a temperature environment below 0 [''C], there is almost no deterioration of the wall interface.On the other hand, during the operation of the internal combustion l!
The temperature near the pressure detection member 1 is approximately 350 ['C]. Therefore, the combustion pressure can be detected without deteriorating the piezoelectric element 2 without taking any particular measures to cool the pressure sensing member 1.
以上のように、本実施例によれば、点火プラグ１０の停
会部材１３と絶縁物１２との間であり、かつ点火ギャッ
プ１６近傍となる位置に、圧ツノ検知部材１を設置した
。そのため、燃焼室と圧力検知部材１との距離が矧くな
り、さらに燃焼の圧力による圧力検知部材１の変形量を
他の物理的変位量に変換するΦことなく、電気信号に変
換して検出できるため、測定誤差が減少されるとともに
、応答性が敏速になり、センサとしての性能が向上する
という効果が得られる。また、圧力検知部材１を点火プ
ラグ１０に一体的に設置したため、センサの取り付は口
などを新たに設ける必要がなくなり、燃焼圧力センサと
点火プラグが別体のときに比べ、燃焼室の構造が簡略化
できる。さらに、本実施例装置は、点火プラグを用いて
いるとともに、リング状の圧力検知部材１を用いた簡素
な構造で′あるため、製造が容易である。しかも、点火
プラグ１０をシリンダヘッド２０に取り付けるだけでｔ
！！焼の圧力を検出できるので、装着性が向上する。ま
た、圧力検出用の圧電素子２としてニオブ酸リチウムを
使用したため、新たに冷却手段を講じなくても、燃焼圧
力を検出でき、しかも耐久性が＾く長時間使用すること
ができるという効果が得られる。As described above, according to this embodiment, the pressure horn detection member 1 is installed at a position between the stop member 13 and the insulator 12 of the spark plug 10 and near the ignition gap 16. Therefore, the distance between the combustion chamber and the pressure sensing member 1 becomes narrow, and the amount of deformation of the pressure sensing member 1 due to combustion pressure is not converted into other physical displacement amounts, but is converted into an electrical signal and detected. As a result, measurement errors are reduced, responsiveness is quickened, and the performance of the sensor is improved. In addition, since the pressure detection member 1 is installed integrally with the spark plug 10, there is no need to create a new opening for installing the sensor, and the structure of the combustion chamber is can be simplified. Furthermore, since the device of this embodiment uses a spark plug and has a simple structure using the ring-shaped pressure sensing member 1, it is easy to manufacture. Moreover, just by attaching the spark plug 10 to the cylinder head 20,
! ! Since the burning pressure can be detected, the wearability is improved. In addition, since lithium niobate is used as the piezoelectric element 2 for pressure detection, combustion pressure can be detected without any additional cooling means, and it is durable and can be used for a long time. It will be done.
〈発明の効果〉
以上のように、本発明によれば、点火プラグの・座金部
材と絶縁体の間であり、中心電極および側方電極の間の
点火ギャップ近傍に、ニオブ酸リチウムからなる圧電素
子を設置して、燃焼の圧力を測定するようにした。その
ため、センサの応答性が良くなるとともに、圧電素子の
変形量を他の物理的な変位量に変換することなく、電気
信号に変換して検出できるので、測定の精度が向上する
という効果が得られる。また、内’ｍｓ＋関の燃焼室に
センサ取り付は部やセンサの冷却手段を新たに設ける必
要がなくなり、燃焼室の構造が簡略化でき、さらに、簡
素な構造であるため製造が容易であるとともに、装着性
が向上するという効果が得られる。<Effects of the Invention> As described above, according to the present invention, a piezoelectric material made of lithium niobate is provided between the washer member and the insulator of the spark plug, and near the ignition gap between the center electrode and the side electrodes. An element was installed to measure the combustion pressure. This improves the responsiveness of the sensor, and the amount of deformation of the piezoelectric element can be detected by converting it into an electrical signal without converting it into other physical displacement amounts, which has the effect of improving measurement accuracy. It will be done. In addition, there is no need to provide a new sensor mounting section or cooling means for the sensor in the combustion chamber of the internal combustion chamber, which simplifies the structure of the combustion chamber.Furthermore, the simple structure facilitates manufacturing. At the same time, the effect of improving wearability can be obtained.
一部を拡大した断面図、第４図は第１の従来例の断面図
、第５図は第２の従来例の断面図、である。
１・・・圧力検出部材、２・・・圧電素子、１２・・・
絶縁物、１３・・・座金部材。
第１図FIG. 4 is a cross-sectional view of a first conventional example, and FIG. 5 is a cross-sectional view of a second conventional example. 1... Pressure detection member, 2... Piezoelectric element, 12...
Insulator, 13... washer member. Figure 1
Claims (1)
された座金部材と、 を有する点火プラグに内蔵された燃焼圧力センサにおい
て、 前記絶縁体および前記座金部材の間であり、かつ前記中
心電極および前記側方電極の間の点火ギャップ近傍に設
置されたニオブ酸リチウムからなる圧電素子と、 を備えることを特徴とする燃焼圧力センサ。[Claims] A combustion device built into a spark plug, comprising: an insulator formed around a center electrode; a washer member electrically connected to a side electrode and formed around the insulator. A pressure sensor, comprising: a piezoelectric element made of lithium niobate installed between the insulator and the washer member and near the ignition gap between the center electrode and the side electrodes. Combustion pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14077090A JPH0434327A (en) | 1990-05-30 | 1990-05-30 | Combustion pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14077090A JPH0434327A (en) | 1990-05-30 | 1990-05-30 | Combustion pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0434327A true JPH0434327A (en) | 1992-02-05 |
Family
ID=15276344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14077090A Pending JPH0434327A (en) | 1990-05-30 | 1990-05-30 | Combustion pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0434327A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012132450A1 (en) | 2011-03-31 | 2012-10-04 | シチズンファインテックミヨタ株式会社 | Cylinder internal-pressure sensor for engine |
| WO2014034640A1 (en) | 2012-08-29 | 2014-03-06 | シチズンファインテックミヨタ株式会社 | Combustion pressure sensor |
| WO2014046048A1 (en) * | 2012-09-19 | 2014-03-27 | シチズンファインテックミヨタ株式会社 | Pressure detection device |
| WO2014050999A1 (en) * | 2012-09-27 | 2014-04-03 | シチズンファインテックミヨタ株式会社 | Functional component unit having combustion pressure sensor for internal combustion engine |
-
1990
- 1990-05-30 JP JP14077090A patent/JPH0434327A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012132450A1 (en) | 2011-03-31 | 2012-10-04 | シチズンファインテックミヨタ株式会社 | Cylinder internal-pressure sensor for engine |
| US8915125B2 (en) | 2011-03-31 | 2014-12-23 | Citizen Finetech Miyota Co., Ltd. | Cylinder internal-pressure sensor for engine |
| WO2014034640A1 (en) | 2012-08-29 | 2014-03-06 | シチズンファインテックミヨタ株式会社 | Combustion pressure sensor |
| CN104583744A (en) * | 2012-08-29 | 2015-04-29 | 西铁城精技美优达株式会社 | Combustion pressure sensor |
| JPWO2014034640A1 (en) * | 2012-08-29 | 2016-08-08 | シチズンファインデバイス株式会社 | Combustion pressure sensor |
| US9841356B2 (en) | 2012-08-29 | 2017-12-12 | Citizen Finedevice Co., Ltd. | Combustion pressure sensor |
| WO2014046048A1 (en) * | 2012-09-19 | 2014-03-27 | シチズンファインテックミヨタ株式会社 | Pressure detection device |
| JPWO2014046048A1 (en) * | 2012-09-19 | 2016-08-18 | シチズンファインデバイス株式会社 | Pressure detection device |
| WO2014050999A1 (en) * | 2012-09-27 | 2014-04-03 | シチズンファインテックミヨタ株式会社 | Functional component unit having combustion pressure sensor for internal combustion engine |
| JPWO2014050999A1 (en) * | 2012-09-27 | 2016-08-22 | シチズンファインデバイス株式会社 | Functional component unit with combustion pressure sensor for internal combustion engines |
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