JPS62222159A - Oxygen sensor - Google Patents
Oxygen sensorInfo
- Publication number
- JPS62222159A JPS62222159A JP61066663A JP6666386A JPS62222159A JP S62222159 A JPS62222159 A JP S62222159A JP 61066663 A JP61066663 A JP 61066663A JP 6666386 A JP6666386 A JP 6666386A JP S62222159 A JPS62222159 A JP S62222159A
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- hollow cylindrical
- oxygen sensor
- solid electrolyte
- electrode
- 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
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 46
- 239000001301 oxygen Substances 0.000 title claims abstract description 46
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 230000002093 peripheral effect Effects 0.000 claims abstract description 15
- 239000007784 solid electrolyte Substances 0.000 claims description 34
- 238000010438 heat treatment Methods 0.000 claims description 25
- 239000007789 gas Substances 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000007787 solid Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 42
- 238000005259 measurement Methods 0.000 description 21
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 8
- 239000000446 fuel Substances 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 101100313164 Caenorhabditis elegans sea-1 gene Proteins 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007723 die pressing method Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/4067—Means for heating or controlling the temperature of the solid electrolyte
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、例えば内燃機関の排気中におりる酸素濃度を
測定する酸素センサに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oxygen sensor that measures the oxygen concentration in the exhaust gas of an internal combustion engine, for example.
［従来の技術］
従来より、公害防止、燃費向上を目的として、内燃機関
の排気中の酸素分圧を測定し、該測定値に基づいた内燃
機関の空燃比フィードバック制御が行なわれている。こ
のような排気中の酸素分圧の測定は、例えば、ジルコニ
ア、イツトリア固溶体等の酸素イオン伝導性の固体電解
質層からなる酸素センサにより行なわれる。上記酸素セ
ンサとしては、例えば、実開昭６０−１００６５８号公
報等が提案されている。すなわら、内外同心に円筒状に
形成された内側電極および外側電極と、前記内外電極の
間隙に介在させた酸素イオン伝導性固体電解質層とを設
（プ、外側の面に測定ガスを、内側の面に基準酸素源と
しての大気を各々導入して測定ガス中の酸素分圧を測定
するものである。[Prior Art] Conventionally, for the purpose of preventing pollution and improving fuel efficiency, oxygen partial pressure in the exhaust gas of an internal combustion engine has been measured, and air-fuel ratio feedback control of the internal combustion engine has been performed based on the measured value. Such measurement of the oxygen partial pressure in the exhaust gas is carried out using, for example, an oxygen sensor made of an oxygen ion conductive solid electrolyte layer such as zirconia or yttria solid solution. As the above-mentioned oxygen sensor, for example, Japanese Utility Model Application Publication No. 100658/1983 has been proposed. That is, an inner electrode and an outer electrode formed in a cylindrical shape concentrically on the inner and outer sides, and an oxygen ion conductive solid electrolyte layer interposed in the gap between the inner and outer electrodes are provided. The atmosphere is introduced into the inner surface as a reference oxygen source to measure the oxygen partial pressure in the measurement gas.
［発明が解決しようとする問題点］
しかし、固体電解質層の内側の面に基準大気を測定ガス
と混合することなく導入するためには、例えば該固体電
解質層の内側に包み込まれた棒状の芯材に大気導入路と
なる溝を形成するスリットを設けたグリーンシートを巻
き付けて焼結し、基準大気導入路を形成する必要がある
。すなわち、上述した酸素分圧測定用の固体電解質層を
なすグリーンシートと、上記スリットを有するスペーサ
としてのグリーンシートとの少なくとも２層を同心円状
に焼結する必要がある。このように、複数のグリーンシ
ートを歪みなく同心円状とする作業は極めて困難なため
、製造工程における工数の増加を招き、生産性が低下し
てしまうという問題点があった。[Problems to be Solved by the Invention] However, in order to introduce the reference atmosphere to the inner surface of the solid electrolyte layer without mixing it with the measurement gas, it is necessary to introduce, for example, a rod-shaped core wrapped inside the solid electrolyte layer. It is necessary to form a reference air introduction path by wrapping a green sheet with slits that form grooves that will become air introduction paths around the material and sintering it. That is, it is necessary to concentrically sinter at least two layers: the green sheet forming the solid electrolyte layer for oxygen partial pressure measurement described above and the green sheet serving as the spacer having the slits. As described above, it is extremely difficult to form a plurality of green sheets into concentric circles without distortion, which leads to an increase in the number of man-hours in the manufacturing process, resulting in a decrease in productivity.
また、棒状の芯材を使用した場合には、酸素センサの熱
容量が大きくなる。したがって、酸素センサを測定に適
した温度に保つために電極部分を加熱するヒータの発熱
量を大きく設定する必要がおり、ヒータの消費電力が増
加すると共にその耐久性も低下するという問題もめった
。Furthermore, when a rod-shaped core material is used, the heat capacity of the oxygen sensor increases. Therefore, in order to maintain the oxygen sensor at a temperature suitable for measurement, it is necessary to set the amount of heat generated by the heater that heats the electrode portion to a large value, which frequently causes the problem that the power consumption of the heater increases and its durability decreases.
本発明は、製造が容易で熱容量の小さな酸素センサの提
供を目的とする。An object of the present invention is to provide an oxygen sensor that is easy to manufacture and has a small heat capacity.
［問題点を解決するための手段］
上記問題を解決するためになされた本発明は、一端側を
開口しくＩ！２端側に閉鎖壁を設けると共に、外周面に
貫通孔を有する中空筒状体と、上記中空筒状体を包み、
内外面に少なくとも一対の電極を有する酸素イオン伝導
性の固体型ｗ４貿層と、
を備え、
しかも、上記固体電解質層の内面側の電極が上記中空筒
状体の貫通孔と対応する位置に配置されてなることを特
徴とする酸素センサを要旨とするものである。[Means for Solving the Problems] The present invention, which was made to solve the above problems, has an I! A hollow cylindrical body provided with a closing wall on the second end side and having a through hole on the outer peripheral surface, and wrapping the hollow cylindrical body,
an oxygen ion conductive solid type W4 layer having at least a pair of electrodes on the inner and outer surfaces thereof, and further, the electrode on the inner surface side of the solid electrolyte layer is arranged at a position corresponding to the through hole of the hollow cylindrical body. The gist of the present invention is an oxygen sensor characterized by:
中空筒状体は開口部から貫通孔を介して、上記固体電解
質層と１対の電極とからなる酸素濃淡電池に基準酸素源
としての大気を導入する基準気体導入路を構成するもの
である。中空筒状体は、例えば金型プレスもしくは押し
出し成型等により加工することができる。なお、材質は
、例えば、上記固体電解質層と熱膨張率の相違が少ない
セラミックス、金属等でもよい。例えば測定ガスが内燃
機関の排気である場合には、６００［’Ｃ］以上の高温
となるので、セラミックスを使用すると好適である。ま
た例えば、金属を使用する場合は、固体電解質層の内周
面の電極との間を絶縁する必要がある。The hollow cylindrical body constitutes a reference gas introduction path for introducing atmospheric air as a reference oxygen source into the oxygen concentration battery consisting of the solid electrolyte layer and a pair of electrodes from the opening through the through hole. The hollow cylindrical body can be processed, for example, by die pressing or extrusion molding. Note that the material may be, for example, ceramic, metal, or the like, which has a small difference in coefficient of thermal expansion from the solid electrolyte layer. For example, if the gas to be measured is exhaust gas from an internal combustion engine, the temperature will be higher than 600['C], so it is preferable to use ceramics. For example, when metal is used, it is necessary to insulate the solid electrolyte layer from the electrode on the inner peripheral surface.
固体電解質層は、酸素イオン伝導性を有するものでおる
。例えば、Ｙ２０３−ＺｒＯｚ 、ｃａ。The solid electrolyte layer has oxygen ion conductivity. For example, Y203-ZrOz, ca.
−Ｚ ｒｏｚ等でおってもよい。-Z roz etc. may be used.
電極は、例えば白金等の肖金属またはこれらにセラミッ
ク粉末を混合したガス透過質のものにより実現できる。The electrode can be realized by, for example, a metal such as platinum or a gas permeable material mixed with ceramic powder.
これらは、例えば、電極を厚膜印刷した固体電解黄体の
グリーンシートを、その内面側の電極か中空筒状体の貫
通孔と対応する位置に配設されるように、該中空筒状体
に巻き付けた後に治具により筒状に固定し、焼成一体化
することにより酸素センサとすることができる。For example, a green sheet of a solid electrolytic body on which electrodes are thickly printed is placed on the hollow cylindrical body so that the inner surface of the green sheet corresponds to the electrode or the through hole of the hollow cylindrical body. After being wound, it is fixed in a cylindrical shape using a jig, and is baked and integrated to form an oxygen sensor.
上記固体電解質層は、例えば、その内面の電極近傍に発
熱体を厚膜印刷するよう構成してもよい。The solid electrolyte layer may be configured such that, for example, a heating element is thickly printed on the inner surface of the solid electrolyte layer near the electrodes.
また例えば、その外面の電極近傍に発熱体を厚膜印刷す
るよう構成することもできる。このように発熱体を設け
た場合には、電極近傍の温度を測定に好適な温度とする
ことができる。Further, for example, a heating element may be thickly printed on the outer surface near the electrodes. When the heating element is provided in this way, the temperature near the electrode can be set to a temperature suitable for measurement.
［作用］
本発明の酸素センサは、中空筒状体の開口部から貫通孔
を介して固体電解質店内面側の電極に至る基準気体導入
路を形成する。したがって、固体電解質層はその内面側
が基準気体に、一方、外面側が測定ガスに各々触れるの
で、両面に設けられた一対の電極間に流れる電流を計測
することにより測定ガス中の酸素分圧を求めることがで
きる。[Function] The oxygen sensor of the present invention forms a reference gas introduction path from the opening of the hollow cylindrical body to the electrode on the inner surface of the solid electrolyte store via the through hole. Therefore, since the inner surface of the solid electrolyte layer is in contact with the reference gas and the outer surface is in contact with the measurement gas, the oxygen partial pressure in the measurement gas can be determined by measuring the current flowing between a pair of electrodes provided on both sides. be able to.
このように、基準気体導入路を形成するためのスリット
を有するグリーンシー１〜等が不要となると共に、中空
筒状体を使用するので、簡単な構造で熱容量の小ざい酸
素センサを実現できる。In this way, the green sea 1 to etc. having slits for forming the reference gas introduction path are not required, and since a hollow cylindrical body is used, an oxygen sensor with a small heat capacity can be realized with a simple structure.
［実施例］
次に、本発明の第１実施例を第１図〜第５図に基づいて
説明する。なお、説明上各図は部分毎の縮尺が異なる。[Example] Next, a first example of the present invention will be described based on FIGS. 1 to 5. For convenience of explanation, the scale of each part in each figure is different.
第１図に示すように、第１実施例の酸素センサ１は、Ｚ
ｒＯ：ｚからなり゛、外周面に貫通孔２，３を有する中
空筒状体４を、基準電極５、測定電極６および発熱体７
を設けた固体電解質層８で被覆して構成されている。As shown in FIG. 1, the oxygen sensor 1 of the first embodiment has Z
A hollow cylindrical body 4 consisting of rO:z and having through holes 2 and 3 on its outer peripheral surface is connected to a reference electrode 5, a measuring electrode 6 and a heating element 7.
It is constructed by being covered with a solid electrolyte layer 8 provided with.
第１図のＡ−Ａ端面図で市る第２図に示すように、基準
電極５は、固体電解質層８の中空筒状体４に接する内周
面上の、上記貫通孔２，３に対応する位置に設けられて
いる。また、測定電極６は、固体電解質層８の外周面上
の、上記基準電極５に対向する位置に配設されている。As shown in FIG. 2 taken along the line A-A in FIG. are provided in corresponding positions. Furthermore, the measurement electrode 6 is disposed on the outer peripheral surface of the solid electrolyte layer 8 at a position facing the reference electrode 5 .
ざらに発熱体７は、固体電解質層８の外周面上であって
、上記測定電極６０両側に設けられている。Roughly speaking, the heating elements 7 are provided on the outer peripheral surface of the solid electrolyte layer 8 and on both sides of the measurement electrode 60.
基準電極５は固体電解質層８に設けられたスルーホール
を介して、第１図に示す基準電極端子１１に接続される
。また、測定電極６は測定電極端子１２に、発熱体７は
発熱体端子１３に各々接続される。The reference electrode 5 is connected to a reference electrode terminal 11 shown in FIG. 1 via a through hole provided in the solid electrolyte layer 8. Further, the measurement electrode 6 is connected to the measurement electrode terminal 12, and the heating element 7 is connected to the heating element terminal 13.
第４図をＢ −８’方向に切断した状態を第３図に示す
。中空筒状体４は、外径３．２ ［ｍｍ］ 、内径１．
５ ［ｍｍ］の中空円筒であって、一端側は開口部１４
を、他端側は閉鎖壁１５を各々形成している。上記閉鎖
壁１５近傍の外周面には、２個の直径１ ［ｍｍ］の貫
通孔２，３が穿設されている。したがって、上記開口部
１４がら中空部１６を介して貫通孔２．３に至る基準気
体導入路が形成されている。このような中空筒状体４は
、金型プレスまたは押し出し成形により容易に加工でき
る。FIG. 3 shows a state in which FIG. 4 is cut in the B-8' direction. The hollow cylindrical body 4 has an outer diameter of 3.2 [mm] and an inner diameter of 1.2 mm.
5 [mm] hollow cylinder with an opening 14 at one end.
and the other end side forms a closing wall 15, respectively. Two through holes 2 and 3 each having a diameter of 1 mm are bored in the outer peripheral surface near the closing wall 15. Therefore, a reference gas introduction path is formed from the opening 14 to the through hole 2.3 via the hollow portion 16. Such a hollow cylindrical body 4 can be easily processed by die pressing or extrusion molding.
固体電解質層８は、第４図に示すように、Ｙ２Ｏ３〜Ｚ
ｒ０ｚ固溶体原料粉末に通常使用されるバインダを混合
したグリーンシート８ａがら得られる。該グリーンシー
ト８ａの一角部には、基準電極５を基準電極端子１１に
接続するためのスルーホール２１が穿設されている。The solid electrolyte layer 8, as shown in FIG.
A green sheet 8a is obtained by mixing the r0z solid solution raw material powder with a commonly used binder. A through hole 21 for connecting the reference electrode 5 to the reference electrode terminal 11 is bored in one corner of the green sheet 8a.
上記固体電解質層８の内周面となる上記グリーンシート
８ａの裏面には、ジルコニアを含む白金から成る厚ざ１
０［μｍ］の基準電極５が厚膜印刷される。On the back surface of the green sheet 8a, which becomes the inner circumferential surface of the solid electrolyte layer 8, there is a thickness plate made of platinum containing zirconia.
A reference electrode 5 of 0 [μm] is printed as a thick film.
一方、上記固体電解質層８の外周面となるグリーンシー
ト８ａの表面には、ジルコニアを含む白金から成る厚ざ
１０［μｍ］の基準電極端子１１、測定電極６および測
定電極端子１２が、まず厚膜印刷される。次に、白金を
含むアルミナから成る厚ざ２０［μｍ１の保護層２２が
、上記測定電極６の表面に厚膜印刷される。次に、アル
ミナから成る厚ざ３０［μｍ］の絶縁層２３が、上述し
た基準および測定電極端子１１．’１２の上面２４と、
測定電極６の上面２５とを除くグリーンシート８ａの表
面に亘って厚膜印刷される。ざらに、アルミナを含む白
金から成る厚ざ１０［μｍ］の発熱体７および発熱体電
極１３が、上記絶縁層２３の表面に厚膜印刷される。最
債に、シリカを含むアルミナから成る厚さ２０［μｍ］
の絶縁層２６が、上記発熱体電極１３の上面２７と、測
定電極の上面２８とを除く絶縁層２３の表面に亘って厚
膜印刷される。On the other hand, on the surface of the green sheet 8a, which is the outer peripheral surface of the solid electrolyte layer 8, a reference electrode terminal 11, a measurement electrode 6, and a measurement electrode terminal 12 made of platinum containing zirconia and having a thickness of 10 [μm] are placed. Film printed. Next, a protective layer 22 made of alumina containing platinum and having a thickness of 20 [μm1] is thickly printed on the surface of the measurement electrode 6. Next, an insulating layer 23 made of alumina and having a thickness of 30 μm is applied to the reference and measurement electrode terminals 11 . '12 upper surface 24,
A thick film is printed over the entire surface of the green sheet 8a except for the upper surface 25 of the measurement electrode 6. Roughly, a heating element 7 and a heating element electrode 13 made of platinum containing alumina and having a thickness of 10 μm are printed on the surface of the insulating layer 23 in a thick film. Most importantly, it is made of alumina containing silica and has a thickness of 20 [μm].
An insulating layer 26 is thickly printed over the entire surface of the insulating layer 23 except for the upper surface 27 of the heating element electrode 13 and the upper surface 28 of the measuring electrode.
上述のように厚膜印刷されたグリーンシート８ａの裏面
にジルコニアペーストを塗布し、上記基準電極５が中空
筒状体４の貫通孔２，３と対応する位置となるように、
中空筒状体４をグリーンシート８ａで被膜する。さらに
、真空引きをしながらラバープレスを行ない、グリーン
シート８ａを巻き付は厚着固定した後、大気中で焼成す
ることにより、第１図に示す酸素センサ１を得る。Zirconia paste is applied to the back surface of the green sheet 8a printed with a thick film as described above, so that the reference electrode 5 is located at a position corresponding to the through holes 2 and 3 of the hollow cylindrical body 4.
The hollow cylindrical body 4 is coated with a green sheet 8a. Furthermore, rubber pressing is performed while vacuuming, and after wrapping and fixing the green sheet 8a in a thick manner, the oxygen sensor 1 shown in FIG. 1 is obtained by firing in the atmosphere.
上記のようにして得られた酸素センサ１を、第５図に示
すように、ホルダ３２に、カーボングラフアイ１−１滑
石等の充填粉末３３、パツキン３４、かしめリング３５
により固定する。また、既述した各端子１１，１２．１
３に圧着端子金具３６をろう付けし、さらにリード線３
７を圧着する。その後、主体金具３８、保護外筒３９、
グロメット４０、プロテクタ４１を取り付けると、酸素
検出プローブ４２を構成できる。As shown in FIG. 5, the oxygen sensor 1 obtained as described above is placed in a holder 32 with a filling powder 33 such as carbon graphite 1-1 talc, a packing 34, and a caulking ring 35.
Fix it by. In addition, each terminal 11, 12.1 mentioned above
3, and then solder the crimp terminal fitting 36 to the lead wire 3.
Crimp 7. After that, the metal shell 38, the protective outer cylinder 39,
When grommet 40 and protector 41 are attached, oxygen detection probe 42 can be configured.
第１実施例の酸素センサ１は、中空筒状体４の開口部１
４から貫通孔２，３を介して基準電極５に大気が導入さ
れるので、基準気体導入路を構成するためのストック付
グリーンシート層等が不要となり、製造工数の低減によ
り生産性を向上できる。The oxygen sensor 1 of the first embodiment has an opening 1 of a hollow cylindrical body 4.
Since the atmosphere is introduced into the reference electrode 5 from 4 through the through holes 2 and 3, there is no need for a green sheet layer with stock to form the reference gas introduction path, and productivity can be improved by reducing manufacturing man-hours. .
また、中空筒状体４を使用したいるため、酸素センサ１
の熱容量が小さいので、発熱体７の熱効率が向上し、消
費電力を低減できる。In addition, since the hollow cylindrical body 4 is used, the oxygen sensor 1
Since the heat capacity of the heating element 7 is small, the thermal efficiency of the heating element 7 is improved and power consumption can be reduced.
さらに、発熱体７をグリーンシート８ａの表面に厚膜印
刷しているので、製造が極めて容易となる。Furthermore, since the heating element 7 is thickly printed on the surface of the green sheet 8a, manufacturing becomes extremely easy.
次に、本発明第２実施例を第６図に基づいて説明する。Next, a second embodiment of the present invention will be described based on FIG. 6.
第２実施例の特徴は、固体電解質層の内周面に発熱体を
設けたことでおる。The feature of the second embodiment is that a heating element is provided on the inner peripheral surface of the solid electrolyte layer.
第６図に示すように、固体電解質層の内周面となるグリ
ーンシート１０８ａの裏面には、基準電極１０５、絶縁
層１５２、発熱体１０７、絶縁層１５１がこの順に厚膜
印刷される。一方、固体電解質層の外周面となるグリー
ンシート１０８の表面には、測定電極１０６、保護層１
２２、絶縁層１５３、基準電極端子１１１、測定電極端
子１１２および発熱体端子１１３がこの順で厚膜印刷さ
れる。上述のように厚膜印刷されたグリーンシート１０
８ａの基準電極１０５が中空筒状体１０４の貫通孔１０
２と対応する位置となるように、中空筒状体１０４をグ
リーンシート１０８ａで被覆し、既述した第１実施例と
同様な方法で焼成すると、酸素センサを得る。なお、各
部材の成分は、既述した第１実施例と同様でおる。As shown in FIG. 6, a reference electrode 105, an insulating layer 152, a heating element 107, and an insulating layer 151 are thickly printed in this order on the back surface of the green sheet 108a, which is the inner peripheral surface of the solid electrolyte layer. On the other hand, on the surface of the green sheet 108, which is the outer peripheral surface of the solid electrolyte layer, a measuring electrode 106 and a protective layer 1
22, the insulating layer 153, the reference electrode terminal 111, the measurement electrode terminal 112, and the heating element terminal 113 are thick-film printed in this order. Green sheet 10 printed with thick film as described above
The reference electrode 105 of 8a is connected to the through hole 10 of the hollow cylindrical body 104.
The hollow cylindrical body 104 is covered with a green sheet 108a at a position corresponding to 2 and fired in the same manner as in the first embodiment described above to obtain an oxygen sensor. Note that the components of each member are the same as in the first embodiment described above.
上記構成の第２実施例は、グリーンシー１へ１０８ａに
対して発熱体１０７が基準電極１０５と同じ側の面に厚
膜印刷されているため、測定に適した温度に加熱する場
合の熱効率が極めて高い。このことは、低温度の測定ガ
スの酸素分圧を測定する場合でも、測定部が冷却されに
くいので、特に有効である。したがって、例えば、自動
車等の排気測定に使用した場合には、エンジン始動後、
速やかに測定を開始できる。In the second embodiment with the above configuration, the heating element 107 is thickly printed on the same side as the reference electrode 105 for the green sea 1 108a, so the thermal efficiency when heating to a temperature suitable for measurement is low. Extremely high. This is particularly effective even when measuring the oxygen partial pressure of the measurement gas at a low temperature, since the measuring section is not easily cooled. Therefore, for example, when used for measuring exhaust emissions from automobiles, etc., after starting the engine,
Measurement can be started immediately.
次に、本発明第３実施例を第７図に基づいて説明する。Next, a third embodiment of the present invention will be described based on FIG.
第３実施例は、第１実施例で既述した中空筒状体を空燃
比センサに応用したことを特徴とする。The third embodiment is characterized in that the hollow cylindrical body described in the first embodiment is applied to an air-fuel ratio sensor.
第７図に示すように、固体電解質層の内周面となるグリ
ーンシート２０８ａの裏面には、第２ポンプ電極２６２
、拡散律速層２６１、測定電極２０６、固体電解質層２
６３、基準電極２０５がこの順に厚膜印刷される。一方
、固体電解質層の外周面となるグリーンシート２０８ａ
の表面には、第１ポンプ電極２６４、絶縁層２２６、発
熱体２０７および絶縁層２２９がこの順で厚膜印刷され
る。上述のように厚膜印刷されたグリーンシート２０８
ａを既述した第１実施例と同様に中空筒状体２０４に巻
き付けた後、大気中にて焼成すると空燃比センサを得る
。As shown in FIG. 7, a second pump electrode 262 is provided on the back surface of the green sheet 208a, which is the inner peripheral surface of the solid electrolyte layer.
, diffusion control layer 261, measurement electrode 206, solid electrolyte layer 2
63, the reference electrode 205 is thick-film printed in this order. On the other hand, a green sheet 208a serving as the outer peripheral surface of the solid electrolyte layer
A first pump electrode 264, an insulating layer 226, a heating element 207, and an insulating layer 229 are thickly printed on the surface of the substrate in this order. Green sheet 208 printed with thick film as described above
A is wound around the hollow cylindrical body 204 in the same manner as in the first embodiment described above, and then fired in the atmosphere to obtain an air-fuel ratio sensor.
上記構成の第３実施例は、一層のグリーンシート２０８
ａの表面上に発熱体２０７を厚膜印刷により形成してい
る。このため、極めて容易に製造できる。The third embodiment of the above configuration has a single green sheet 208.
A heating element 207 is formed on the surface of a by thick film printing. Therefore, it can be manufactured extremely easily.
また、中空筒状体２０４と一層のグリーンシート２０８
とから構成されているので、熱容量が小ざくなり、発熱
体の消費電極を低減できると共に、その耐久性も向上で
きる。In addition, a hollow cylindrical body 204 and a green sheet 208
Since the heat capacity is small, the electrode consumption of the heating element can be reduced, and its durability can also be improved.
さらに、上述のような簡単な構成で、酸素濃淡電池素子
と酸素ポンプ素子とを組み合わせて、ポンプ電流がら空
燃比信号を検出できる。Furthermore, with the above-described simple configuration, an air-fuel ratio signal can be detected from the pump current by combining the oxygen concentration battery element and the oxygen pump element.
以上本発明の実施例について説明したが、本発明はこの
ような実施例に何等限定されるものではなく、本発明の
要旨を逸脱しない範囲内において種々なる態様で実施し
得ることは勿論である。Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and it goes without saying that it can be implemented in various forms without departing from the gist of the present invention. .
［発明の効果］
本発明の酸素センサは、一端側を開口し外周面に貫通孔
を有する中空筒状体を基準気体導入路とし、該中空筒状
体を固体電解質層で被覆するという簡単な構造である。[Effects of the Invention] The oxygen sensor of the present invention uses a hollow cylindrical body that is open at one end and has a through hole on the outer peripheral surface as a reference gas introduction path, and is simple in that the hollow cylindrical body is covered with a solid electrolyte layer. It is a structure.
このため、中空筒状体を包む固体電解質層が一層で済む
ので、製造工数が減少して生産性が向上する。Therefore, only one solid electrolyte layer surrounding the hollow cylindrical body is required, reducing the number of manufacturing steps and improving productivity.
また、中空筒状体を使用するため、熱容Ｍが小さくなる
ので、酸素センサを活性化させるだめの発熱体の熱効率
が向上すると共に消費電力を低減できる。Further, since the hollow cylindrical body is used, the heat capacity M is reduced, so that the thermal efficiency of the heating element for activating the oxygen sensor is improved and power consumption can be reduced.
第１図は本発明第１実施例の斜視図、第２図は同じくそ
のＡ−Ａ端面図、第３図は同じくその中空筒状体の部分
破断図、第４図は本発明第１実施例の説明図、第５図は
それを用いた酸素検出プローブの部分破断図、第６図は
本発明第２実施例の説明図、第７図は本発明第３実施例
の説明図で必る。
１・・・酸素センサ
２．３・・・貫通孔
４・・・中空筒状体
５・・・基Ｑ−電極
６・・・測定電極
７・・・発熱体
８・・・固体電解質層
１４・・・開口部
１５・・・閉鎖壁FIG. 1 is a perspective view of the first embodiment of the present invention, FIG. 2 is an A-A end view thereof, FIG. 3 is a partially cutaway view of the hollow cylindrical body, and FIG. 4 is the first embodiment of the present invention. FIG. 5 is a partially cutaway diagram of an oxygen detection probe using the same, FIG. 6 is an explanatory diagram of the second embodiment of the present invention, and FIG. 7 is an explanatory diagram of the third embodiment of the present invention. Ru. 1...Oxygen sensor 2.3...Through hole 4...Hollow cylindrical body 5...Group Q-electrode 6...Measuring electrode 7...Heating element 8...Solid electrolyte layer 14 ...Opening 15...Closing wall
Claims (1)
周面に貫通孔を有する中空筒状体と、上記中空筒状体を
包み、内外面に少なくとも一対の電極を有する酸素イオ
ン伝導性の固体電解質層と、 を備え、 しかも、上記固体電解質層の内面側の電極が上記中空筒
状体の貫通孔と対応する位置に配置されてなることを特
徴とする酸素センサ。 ２ 上記固体電解質層が、その内面に発熱体を有する特
許請求の範囲第１項に記載の酸素センサ。 ３ 上記固体電解質層が、その外面に発熱体を有する特
許請求の範囲第１項に記載の酸素センサ。[Scope of Claims] 1. A hollow cylindrical body that is open at one end and provided with a closed wall at the other end and has a through hole on its outer peripheral surface, and at least a pair of electrodes surrounding the hollow cylindrical body and on the inner and outer surfaces. an oxygen ion conductive solid electrolyte layer having an oxygen ion conductivity, and an electrode on the inner surface side of the solid electrolyte layer is disposed at a position corresponding to the through hole of the hollow cylindrical body. sensor. 2. The oxygen sensor according to claim 1, wherein the solid electrolyte layer has a heating element on its inner surface. 3. The oxygen sensor according to claim 1, wherein the solid electrolyte layer has a heating element on its outer surface.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61066663A JPH0676988B2 (en) | 1986-03-24 | 1986-03-24 | Oxygen sensor |
| DE19873709516 DE3709516C2 (en) | 1986-03-24 | 1987-03-23 | Oxygen sensor |
| GB8706866A GB2190200B (en) | 1986-03-24 | 1987-03-23 | Oxygen sensor |
| US07/432,444 US4980042A (en) | 1986-03-24 | 1989-11-06 | Oxygen sensor and method of making it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61066663A JPH0676988B2 (en) | 1986-03-24 | 1986-03-24 | Oxygen sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62222159A true JPS62222159A (en) | 1987-09-30 |
| JPH0676988B2 JPH0676988B2 (en) | 1994-09-28 |
Family
ID=13322362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61066663A Expired - Fee Related JPH0676988B2 (en) | 1986-03-24 | 1986-03-24 | Oxygen sensor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0676988B2 (en) |
| DE (1) | DE3709516C2 (en) |
| GB (1) | GB2190200B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01219662A (en) * | 1988-02-29 | 1989-09-01 | Ngk Spark Plug Co Ltd | Detecting element of oxygen |
| JPH01134252U (en) * | 1988-03-09 | 1989-09-13 | ||
| US5164068A (en) * | 1989-08-08 | 1992-11-17 | Nippondenso Co., Ltd. | Oxygen sensor |
| JP2001242130A (en) * | 2000-02-29 | 2001-09-07 | Kyocera Corp | Gas sensor element |
| JP2001289818A (en) * | 2000-01-31 | 2001-10-19 | Kyocera Corp | Air/fuel ratio sensor element |
| JP2002174619A (en) * | 2000-12-07 | 2002-06-21 | Kyocera Corp | Gas sensor |
| JP2002257784A (en) * | 2001-02-28 | 2002-09-11 | Kyocera Corp | Air-fuel ratio sensor element |
| JP2005201840A (en) * | 2004-01-19 | 2005-07-28 | Hitachi Ltd | Oxygen concentration detecting element |
| JP2005351737A (en) * | 2004-06-10 | 2005-12-22 | Hitachi Ltd | Oxygen concentration detection element |
| US9540282B2 (en) | 2012-03-16 | 2017-01-10 | Denso Corporation | Gas sensor element and its manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6426631B1 (en) * | 1999-04-28 | 2002-07-30 | Kyocera Corporation | Oxygen sensor device incorporating a heater therein |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3915828A (en) * | 1973-12-06 | 1975-10-28 | Westinghouse Electric Corp | Solid electrolyte cell assembly |
| US4428817A (en) * | 1982-08-12 | 1984-01-31 | Westinghouse Electric Corp. | Sensor cell structure for oxygen-combustibles gas mixture sensor |
| JPS60100658U (en) * | 1983-12-15 | 1985-07-09 | 日本電子機器株式会社 | oxygen sensor element |
| JPS60150449U (en) * | 1984-03-16 | 1985-10-05 | 日本碍子株式会社 | oxygen detector |
-
1986
- 1986-03-24 JP JP61066663A patent/JPH0676988B2/en not_active Expired - Fee Related
-
1987
- 1987-03-23 GB GB8706866A patent/GB2190200B/en not_active Expired
- 1987-03-23 DE DE19873709516 patent/DE3709516C2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01219662A (en) * | 1988-02-29 | 1989-09-01 | Ngk Spark Plug Co Ltd | Detecting element of oxygen |
| JPH01134252U (en) * | 1988-03-09 | 1989-09-13 | ||
| US5164068A (en) * | 1989-08-08 | 1992-11-17 | Nippondenso Co., Ltd. | Oxygen sensor |
| JP2001289818A (en) * | 2000-01-31 | 2001-10-19 | Kyocera Corp | Air/fuel ratio sensor element |
| JP2001242130A (en) * | 2000-02-29 | 2001-09-07 | Kyocera Corp | Gas sensor element |
| JP2002174619A (en) * | 2000-12-07 | 2002-06-21 | Kyocera Corp | Gas sensor |
| JP4646391B2 (en) * | 2000-12-07 | 2011-03-09 | 京セラ株式会社 | Gas sensor |
| JP2002257784A (en) * | 2001-02-28 | 2002-09-11 | Kyocera Corp | Air-fuel ratio sensor element |
| JP2005201840A (en) * | 2004-01-19 | 2005-07-28 | Hitachi Ltd | Oxygen concentration detecting element |
| JP2005351737A (en) * | 2004-06-10 | 2005-12-22 | Hitachi Ltd | Oxygen concentration detection element |
| US9540282B2 (en) | 2012-03-16 | 2017-01-10 | Denso Corporation | Gas sensor element and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2190200A (en) | 1987-11-11 |
| DE3709516A1 (en) | 1987-10-01 |
| GB2190200B (en) | 1989-11-22 |
| JPH0676988B2 (en) | 1994-09-28 |
| DE3709516C2 (en) | 1998-06-10 |
| GB8706866D0 (en) | 1987-04-29 |
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