JPH0410586B2 - - Google Patents
Info
- Publication number
- JPH0410586B2 JPH0410586B2 JP58060848A JP6084883A JPH0410586B2 JP H0410586 B2 JPH0410586 B2 JP H0410586B2 JP 58060848 A JP58060848 A JP 58060848A JP 6084883 A JP6084883 A JP 6084883A JP H0410586 B2 JPH0410586 B2 JP H0410586B2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- solid electrolyte
- oxygen sensor
- concentration battery
- flange
- 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.)
- Expired - Lifetime
Links
- 239000001301 oxygen Substances 0.000 claims description 107
- 229910052760 oxygen Inorganic materials 0.000 claims description 107
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 105
- 239000007784 solid electrolyte Substances 0.000 claims description 60
- 239000004020 conductor Substances 0.000 claims description 21
- 229910052573 porcelain Inorganic materials 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 13
- 239000012212 insulator Substances 0.000 description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910017563 LaCrO Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000011787 zinc oxide Substances 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
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4071—Cells and probes with solid electrolytes for investigating or analysing gases using sensor elements of laminated structure
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)
Description
【発明の詳細な説明】
本発明は固体電解質濃淡電池を用いて酸素濃度
を検知する酸素センサに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oxygen sensor that detects oxygen concentration using a solid electrolyte concentration battery.
従来の、例えば自動車排ガス中の酸素濃度を検
出する酸素センサとして、排ガスの温度が約300
℃以下と低い時でも作動させるためにヒーターを
内蔵した加熱センサ、あるいは空燃比が空気過剰
の状態で用いるいわゆるリーンバーンセンサ等が
提案されている。これらのセンサの素子形状とし
ては固体電解質が有底円筒の形状の他、板状の固
体電解質を積層した形状も提案されている。しか
し従来の板状の固体電解質を積層したセンサ素子
は、素子をセンサーのハウジング等の金具に固定
するためにセメントで埋込む等の構造を用いてお
り、製造しにくい上、耐久性に乏しいものであつ
た。 Conventional oxygen sensors detect the oxygen concentration in automobile exhaust gas, for example, when the exhaust gas temperature is approximately 300°C.
A heating sensor with a built-in heater that operates even at temperatures as low as below 0.degree. C., or a so-called lean burn sensor that is used when the air-fuel ratio is in excess of air, have been proposed. As for the element shape of these sensors, in addition to a shape in which the solid electrolyte is a cylinder with a bottom, a shape in which plate-shaped solid electrolytes are stacked has also been proposed. However, conventional sensor elements in which plate-shaped solid electrolytes are laminated use a structure such as embedding with cement to fix the element to metal fittings such as the sensor housing, which is difficult to manufacture and has poor durability. It was hot.
また、板状の固体電解質を有する酸素センサ素
子において、該酸素センサ素子の端部に磁器製フ
ランジを固着し、該フランジが固着された酸素セ
ンサ素子をハウジングに組み込むようになした例
（例えば特開昭58−27052号公報）が、また、板状
の固体電解質を有する酸素センサ素子にヒータを
一体に設けた例（特開昭55−116248号公報）がそ
れぞれ知られている。 Furthermore, in an oxygen sensor element having a plate-shaped solid electrolyte, a ceramic flange is fixed to the end of the oxygen sensor element, and the oxygen sensor element with the flange fixed is incorporated into a housing (for example, a special There are also known examples in which a heater is integrated with an oxygen sensor element having a plate-shaped solid electrolyte (Japanese Patent Application Laid-open No. 55-116248).
然しながら、このような板状の固体電解質を有
する酸素センサ素子に設けられた電極やヒータに
接続するリード線の接続構造は、固体電解質板上
の電極上のリード部にリード線をロウ付してお
り、製造困難で量産的でないばかりでなく、自動
車のように振動の激しい環境で用いるには耐久性
について、信頼性に欠ける等の欠点があつた。 However, the connection structure of the lead wires connected to the electrodes and heaters provided on such an oxygen sensor element having a plate-shaped solid electrolyte is such that the lead wires are brazed to the lead portions on the electrodes on the solid electrolyte plate. Not only is it difficult to manufacture and cannot be mass-produced, but it also has drawbacks such as lack of durability and reliability when used in environments with strong vibrations such as automobiles.
本発明はこれらの欠点を解決するために完成さ
れたもので、第１の発明は板状の固体電解質と、
該固体電解質の表面に設けられた測定電極と、該
固体電解質に密接しまたは該固体電解質とともに
酸素濃淡電池を構成する他の固体電解質に密接
し、かつ前記測定電極と分離した基準電極とで酸
素濃淡電池を構成し、該酸素濃淡電池を構成する
固体電解質、または該酸素濃淡電池に隣接する固
体電解質に密接してヒータを設けた酸素センサ素
子において、該ヒータのリード線と電気的に接続
する導電体を大気側面に有する磁器製フランジを
前記酸素センサ素子の端部で固着し、該フランジ
が固着された前記酸素センサ素子をハウジングに
組込んだことを基本的な構成とする酸素センサで
ある。 The present invention was completed to solve these drawbacks, and the first invention is a plate-shaped solid electrolyte,
A measurement electrode provided on the surface of the solid electrolyte and a reference electrode that is in close contact with the solid electrolyte or in close contact with another solid electrolyte constituting an oxygen concentration battery together with the solid electrolyte and are separate from the measurement electrode are used to measure oxygen. In an oxygen sensor element that constitutes a concentration battery and has a heater provided in close proximity to the solid electrolyte constituting the oxygen concentration battery or the solid electrolyte adjacent to the oxygen concentration battery, the oxygen sensor element is electrically connected to the lead wire of the heater. The oxygen sensor has a basic configuration in which a porcelain flange having a conductor on the atmospheric side is fixed at the end of the oxygen sensor element, and the oxygen sensor element with the flange fixed is incorporated into a housing. .
第１の発明の酸素センサでは、酸素センサ素子
に酸素ポンプを構成する１対の電極を設けて、こ
の電極間に直流電圧を印加して直流の電気量に比
例した量の酸素を固体電解質の一方の側に移動さ
せることができる。 In the oxygen sensor of the first invention, the oxygen sensor element is provided with a pair of electrodes constituting an oxygen pump, and a DC voltage is applied between the electrodes to pump oxygen into the solid electrolyte in an amount proportional to the amount of DC electricity. It can be moved to one side.
この構成においては酸素濃淡電池を構成する電
極のうち少なくとも１つと、酸素ポンプを構成す
る電極のうちの少なくとも１つとを同一のものと
することができる。 In this configuration, at least one of the electrodes that make up the oxygen concentration battery and at least one of the electrodes that make up the oxygen pump can be the same.
さらに第１の発明の酸素センサは、酸素濃淡電
池を構成する電極のうちの少なくとも１つ、およ
び／または酸素ポンプを構成する電極のうちの少
なくとも１つをヒータと兼用することができる。 Furthermore, in the oxygen sensor of the first invention, at least one of the electrodes that make up the oxygen concentration battery and/or at least one of the electrodes that make up the oxygen pump can also be used as a heater.
第２の発明は、酸素濃淡電池に隣接する絶縁層
に密接してヒータを設けた酸素センサ素子におい
て、該ヒータのリード線と電気的に接続する導電
体を大気側面に有する磁器製フランジを前記酸素
センサ素子の端部で固着し、該フランジが固着さ
れた前記酸素センサ素子をハウジングに組込んだ
ことを基本的な構成とする酸素センサである。 A second invention is an oxygen sensor element in which a heater is provided in close contact with an insulating layer adjacent to an oxygen concentration battery, in which a porcelain flange having a conductor on the atmospheric side that is electrically connected to a lead wire of the heater is provided. This oxygen sensor has a basic configuration in which the oxygen sensor element is fixed at the end thereof and the oxygen sensor element, to which the flange is fixed, is assembled into a housing.
この構成においては酸素センサ素子に酸素ポン
プを構成する１対の電極を設けることができ、さ
らに酸素濃淡電池を構成する電極のうちの少なく
とも１つと酸素センサを構成する電極のうちの少
なくとも１つを同一のものとすることができる。 In this configuration, the oxygen sensor element can be provided with a pair of electrodes constituting the oxygen pump, and furthermore, at least one of the electrodes constituting the oxygen concentration battery and at least one of the electrodes constituting the oxygen sensor can be provided. They can be the same.
本発明の酸素センサは、上記のいずれの構成に
おいても磁器製フランジの表面に設けられた導電
体に磁器製フランジの形状で位置決めされた金属
端子を押圧して導電的に接続させてハウジングに
組込むことが望ましい。 In any of the above configurations, the oxygen sensor of the present invention is assembled into a housing by pressing a metal terminal positioned in the shape of a porcelain flange to the conductor provided on the surface of the porcelain flange to conductively connect it. This is desirable.
本発明の実施例を第１図ないし第１１図を用い
て詳細に説明する。 Embodiments of the present invention will be described in detail with reference to FIGS. 1 to 11.
本発明で用いる酸素センサ素子は、例えばその
展開図である第１図に示すような板状の固体電解
質を用いた積層された素子である。第１図に示す
ような素子１の構造は以下のようになつている。 The oxygen sensor element used in the present invention is a stacked element using plate-shaped solid electrolytes, as shown in FIG. 1, which is a developed view, for example. The structure of the element 1 shown in FIG. 1 is as follows.
ジルコニア磁器等よりなる固体電解質２の両面
に、例えば白金よりなる多孔質層の１対の電極
３，４が設けられていて酸素濃淡電池を構成して
いる。この電極３，４はそれぞれリード線が設け
られており、そのリード線の先端部３′，４′は積
層された素子１の端面に露出するようになつてい
る。そして電極３は例えばスピネル等よりなる多
孔質セラミツク層５を介して被測定ガスに接触
し、測定電極となる。多孔質セラミツク層５はジ
ルコニア等によりなる気密層６で囲まれている。
電極４は中空部７に露呈しており、中空部７は気
密層８および別の気密層９で囲まれている。中空
部７には標準ガス、例えば大気が入り込むように
なつていて電極４は基準電極となる。そしてさら
に別の気密層１０の表面には加熱用のヒータ１１
が設けられており、ヒータ１１の両端１１′，１
１′は素子１の端面に露出するようになつている。
ヒータ１１に通電される電流は交流でも直流でも
よい。直流のときは気密層９，１０は例えばアル
ミナ磁器等の絶縁体でもよく、交流のときは気密
層９，１０はジルコニア磁器等の固体電解質でも
よい。 A pair of electrodes 3 and 4 made of porous layers made of, for example, platinum are provided on both sides of a solid electrolyte 2 made of zirconia porcelain or the like to constitute an oxygen concentration battery. Each of the electrodes 3 and 4 is provided with a lead wire, and the tips 3' and 4' of the lead wires are exposed at the end faces of the stacked elements 1. The electrode 3 comes into contact with the gas to be measured through a porous ceramic layer 5 made of spinel or the like, and becomes a measuring electrode. The porous ceramic layer 5 is surrounded by an airtight layer 6 made of zirconia or the like.
The electrode 4 is exposed in a hollow part 7 , which is surrounded by a gas-tight layer 8 and a further gas-tight layer 9 . A standard gas, for example, the atmosphere, enters the hollow portion 7, and the electrode 4 serves as a reference electrode. Further, a heater 11 for heating is provided on the surface of another airtight layer 10.
are provided at both ends 11', 1 of the heater 11.
1' is exposed at the end face of the element 1 .
The current applied to the heater 11 may be alternating current or direct current. In the case of direct current, the airtight layers 9 and 10 may be made of an insulator such as alumina porcelain, and in the case of alternating current, the airtight layers 9 and 10 may be made of a solid electrolyte such as zirconia porcelain.
そして素子１は破線で示すフランジ取付部１２
の位置に磁器製のフランジが取付けられる。 The element 1 has a flange mounting portion 12 indicated by a broken line.
A porcelain flange is installed at the position.
フランジは例えば平面図の第２Ａ図、正面図の
第２Ｂ図、側面図の第２Ｃ図、下面図の第２Ｄ図
に示すように素子に取り付けられている。すなわ
ちフランジ１３は素子１にガラス層、無機接着剤
等で固定されているか、あるいは焼成前の成形体
または仮焼品を接合し焼成して１体に結合されて
いる。フランジ表面には素子端面に露出している
電極または導電体の先端部に導電的に接触する導
電体が設けられている。例えば第１図に示すよう
な素子１に第２Ａ図ないし第２Ｄ図に示すような
フランジを取付ける場合、電極３，４より連なる
リード線の先端３′，４′はフランジ表面上の導電
体１４，１５に導電的に接続している。そして抵
抗体１１の両端１１′，１１′はフランジ表面上の
導電体１６，１７に導電的に接続している。フラ
ンジの材質はアルミナ等の絶縁性磁器でもよく、
ジルコニア等の固体電解質磁器でもよい。ただし
耐熱性と、ある程度の絶縁性が要求されるので磁
器とする必要がある。導電体の材質はニツケル、
銀、金、白金、ロジウム、パラジウム、インジウ
ム、ルテニウム、タングステン、モリブデン等の
金属あるいはこれらの合金が耐久性に優れて好ま
しいが、この他の化合物導電体、例えば酸化亜
鉛、LaCrO3、LaB6、SiC等でもよい。 The flange is attached to the element as shown in, for example, FIG. 2A in a plan view, FIG. 2B in a front view, FIG. 2C in a side view, and FIG. 2D in a bottom view. That is, the flange 13 is fixed to the element 1 with a glass layer, an inorganic adhesive, or the like, or is bonded into a single body by joining and firing a molded body or a calcined product before firing. A conductor is provided on the flange surface to conductively contact the tip of the electrode or conductor exposed on the end face of the element. For example, when attaching a flange as shown in FIGS. 2A to 2D to the element 1 shown in FIG. , 15. Both ends 11', 11' of the resistor 11 are electrically conductively connected to conductors 16, 17 on the surface of the flange. The material of the flange may be insulating porcelain such as alumina.
Solid electrolyte porcelain such as zirconia may also be used. However, it must be made of porcelain because it requires heat resistance and a certain degree of insulation. The material of the conductor is nickel.
Metals such as silver, gold, platinum, rhodium, palladium, indium, ruthenium, tungsten, and molybdenum, or alloys thereof are preferred due to their excellent durability, but other compound conductors such as zinc oxide, LaCrO 3 , LaB 6 , SiC etc. may also be used.
本発明のフランジ付素子をケーシングする際
は、例えば第３図に示すように、素子１についた
フランジ１３が導電体１４に導電的に接触してい
るコンタクトリング１８と、導電体１６に導電的
に接触している金属性端子１９とではさまれ、ハ
ウジング２０と碍管２１との間に固定されてい
る。金属製端子１９は第４図に示すようにマイ
カ、アルミナ磁器等の絶縁体２２で位置を固定さ
れている。そして金属製端子１９は碍管２１、ワ
ツシヤー２３、碍管２４を介してキヤツプ２５と
碍管２４の間にある皿バネ２６によりフランジ１
３上の導電体１６に押圧されている。また金属製
端子１９は導線２７を介して引出線２８に導電的
に接続されており、外部の回路につながつてい
る。導電体１４はコンタクトリング１８、ハウジ
ング２０を介して接地されている。なお被測定ガ
スは先端カバー２９の開口部３０を通つて被測定
ガス側空間３１に入り、素子１の測定電極に達
し、一方大気はキヤツプ２５、ハウジング２０、
碍管２１、フランジ１３等の間のすきまから大気
側空間３２に入り、素子１の基準電極に達する。
このとき被測定ガス側空間３１と大気側空間３２
とはフランジ１３、コンタクトリング１８、ハウ
ジング２０により気密に遮断されている。 When casing the flanged element of the present invention, for example, as shown in FIG . It is sandwiched between the metal terminal 19 that is in contact with the housing 20 and the insulator tube 21 . As shown in FIG. 4, the metal terminal 19 is fixed in position with an insulator 22 such as mica or alumina porcelain. The metal terminal 19 is connected to the flange 1 by a disc spring 26 between the cap 25 and the insulator tube 24 via the insulator tube 21, washer 23, and insulator tube 24.
3 is pressed against the conductor 16 on top. Further, the metal terminal 19 is electrically conductively connected to a lead wire 28 via a conductive wire 27, and is connected to an external circuit. The conductor 14 is grounded via a contact ring 18 and a housing 20. Note that the gas to be measured enters the gas-to-be-measured space 31 through the opening 30 of the tip cover 29 and reaches the measurement electrode of the element 1 , while the atmosphere flows through the cap 25, housing 20,
It enters the atmosphere side space 32 through the gap between the insulator tube 21, the flange 13, etc., and reaches the reference electrode of the element 1 .
At this time, the measured gas side space 31 and the atmosphere side space 32
The flange 13, the contact ring 18, and the housing 20 are airtightly separated from the other parts.
本発明の酸素センサは以上の構造に限定される
ものではなく、その他の構造もある。例えば第５
Ａ図ないし第５Ｄ図に示すようなテーパーのつい
た素子３３を用いた構造ではフランジ３４の取付
け位置を決めやすい。またフランジ表面に設ける
導電体の数も任意であり、例えば酸素ポンプを有
する素子では酸素ポンプ用の電圧を印加するため
の導電体が必要であり、逆に加熱用ヒータを有し
ない素子ではそのための導電体は不要となる。ま
た、積層された素子の構造は例えば第６図ないし
第９図のような構造でもよい。ヒータ１１が酸素
濃淡電池を構成する固体電解質２と同一の板の上
に設けられた例を第６図に示す。このような構造
にすると固体電解質２を加熱するためにヒータ１
１に通電する電力を少なくすることができる。な
おこのような構造では酸素濃淡電池の起電力への
影響を少なくするために加熱用電流は交流とする
のがよい。 The oxygen sensor of the present invention is not limited to the above structure, and may have other structures. For example, the fifth
In a structure using a tapered element 33 as shown in FIGS. A to 5D, it is easy to determine the mounting position of the flange 34. The number of conductors provided on the flange surface is also arbitrary; for example, an element with an oxygen pump requires a conductor to apply voltage for the oxygen pump, and conversely, an element without a heater requires a conductor for that purpose. No conductor is required. Further, the structure of the stacked elements may be, for example, the structures shown in FIGS. 6 to 9. FIG. 6 shows an example in which the heater 11 is provided on the same plate as the solid electrolyte 2 constituting the oxygen concentration battery. With this structure, the heater 1 is used to heat the solid electrolyte 2.
1 can be reduced. In addition, in such a structure, the heating current is preferably alternating current in order to reduce the influence on the electromotive force of the oxygen concentration battery.
いわゆるリーンセンサーとして用いる素子の例
を第７図に示す。この構造では固体電解質２上に
酸素濃淡電池を構成する１対の電極３，４と、酸
素ポンプを構成する１対の電極３５，４がある。
但し一方の電極４は酸素濃淡電池を構成する１方
の電極４と酸素ポンプを構成する１方の電極４と
が兼用となつている。この構造では被測定ガスは
拡散孔３６を通りキヤビテイ３７に達するが、酸
素ポンプの働きでキヤビテイ３７内の酸素分圧を
実際の被測定ガスの酸素分圧より低くできるの
で、酸素分圧が理論空燃費の酸素分圧より高いリ
ーン雰囲気の排気ガスを発生するエンジンを制御
するために用いられる。酸素濃淡電池を構成する
１対の電極３，４が設けられている固体電解質２
と酸素ポンプを構成する固体電解質３８が別の板
となつている例を第８図に示す。このような構造
は第７図に示した構造の変形でありこの素子の作
用は第７図に示した例と同様である。 FIG. 7 shows an example of an element used as a so-called lean sensor. In this structure, on the solid electrolyte 2, there are a pair of electrodes 3, 4 constituting an oxygen concentration battery and a pair of electrodes 35, 4 constituting an oxygen pump.
However, one electrode 4 serves both as one electrode 4 constituting an oxygen concentration battery and as one electrode 4 constituting an oxygen pump. In this structure, the gas to be measured passes through the diffusion hole 36 and reaches the cavity 37, but the oxygen partial pressure in the cavity 37 can be made lower than the actual oxygen partial pressure of the gas to be measured by the action of the oxygen pump, so the oxygen partial pressure is lower than the theoretical one. It is used to control engines that generate exhaust gas in a lean atmosphere that is higher than the oxygen partial pressure of air and fuel consumption. A solid electrolyte 2 provided with a pair of electrodes 3 and 4 constituting an oxygen concentration battery
FIG. 8 shows an example in which the solid electrolyte 38 constituting the oxygen pump and the solid electrolyte 38 are separate plates. This structure is a modification of the structure shown in FIG. 7, and the operation of this element is similar to the example shown in FIG.
酸素濃淡電池の基準極側標準ガスとして大気を
用いない例を第９図に示す。２枚の固体電解質
２，３８のうちの一方に酸素濃淡電池を構成する
１対の電極３，４を設け、他の固体電解質３８に
酸素ポンプを構成する１対の電極４，３５を設
け、さらにこの２枚の固体電解質２，３８を積層
する。ここで２枚の固体電解質の間に入る電極４
は酸素濃淡電池を構成する一方の電極と酸素ポン
プを構成する一方の電極とを兼用している。そし
てこの電極４の周囲のガスは酸素ポンプの働きで
酸素分圧が常に０になるようにされ、酸素分圧０
の状態を基準分圧とする。このような構造の素子
では基準極として大気を用いる必要が無いので素
子構造が簡単になり好ましいものである。 FIG. 9 shows an example in which the atmosphere is not used as the standard gas on the reference electrode side of the oxygen concentration battery. One of the two solid electrolytes 2, 38 is provided with a pair of electrodes 3, 4 constituting an oxygen concentration battery, and the other solid electrolyte 38 is provided with a pair of electrodes 4, 35 constituting an oxygen pump, Furthermore, these two solid electrolytes 2 and 38 are laminated. Here, electrode 4 is inserted between two solid electrolytes.
serves both as one electrode constituting the oxygen concentration battery and as one electrode constituting the oxygen pump. Then, the oxygen partial pressure of the gas surrounding this electrode 4 is always kept at 0 by the action of the oxygen pump, and the oxygen partial pressure is 0.
The state of is the reference partial pressure. In an element having such a structure, there is no need to use the atmosphere as a reference pole, so the element structure is simple and preferred.
なお酸素ポンプの働きを逆にして基準極の酸素
分圧をほぼ大気圧に維持して用いてもよい。また
２枚の固体電解質２，３８を１枚とし、その固体
電解質の中に電極４、ヒータ１１を埋込んでもよ
い。 Note that the function of the oxygen pump may be reversed to maintain the oxygen partial pressure at the reference electrode at approximately atmospheric pressure. Alternatively, the two solid electrolytes 2 and 38 may be combined into one solid electrolyte, and the electrodes 4 and heater 11 may be embedded in the solid electrolyte.
酸素濃淡電池を構成する電極のうちの１つとヒ
ータとを兼ねた例を第１０図にしめす。固体電解
質２の片面ずつに測定電極３と基準電極４を設け
て酸素濃淡電池を構成し、基準電極４はヒータを
兼用している。 FIG. 10 shows an example in which one of the electrodes constituting the oxygen concentration battery also serves as a heater. A measuring electrode 3 and a reference electrode 4 are provided on each side of the solid electrolyte 2 to constitute an oxygen concentration battery, and the reference electrode 4 also serves as a heater.
酸素濃淡電池を構成している測定電極と基準電
極とが別の固体電解質に設けられている例を第１
１図に示す。この構造では、固体電解質２、固体
電解質よりなる気密層８，９はそれぞれの密着さ
れた界面に垂直に酸素イオンが通過できるように
なつており、
測定電極３、固体電解質２、固体電解質よりな
る気密層８，９、基準電極４により酸素濃淡電池
が構成されている。ヒータ１１が設けられている
気密層１０は固体電解質、絶縁層のいずれでもよ
い。 The first example is an example in which the measuring electrode and the reference electrode constituting the oxygen concentration battery are provided in different solid electrolytes.
Shown in Figure 1. In this structure, the solid electrolyte 2 and the airtight layers 8 and 9 made of the solid electrolyte are configured so that oxygen ions can pass perpendicularly to their closely-adhered interfaces, and the measurement electrode 3 is made of the solid electrolyte 2 and the solid electrolyte. The airtight layers 8 and 9 and the reference electrode 4 constitute an oxygen concentration battery. The airtight layer 10 provided with the heater 11 may be either a solid electrolyte or an insulating layer.
酸素濃淡電池を構成する測定電極と基準電極が
固体電解質の同じ面に設けられている例を第１２
図に示す。固体電解質２の上に設けられた測定電
極３は多孔質セラミツク層５を介して被測定ガス
に接し、基準電極４は気密層６，８で構成される
中空部７に臨んでおり大気に接している。気密層
９は固体電解質でも絶縁層でもよい。 The 12th example shows an example in which the measurement electrode and the reference electrode constituting the oxygen concentration battery are provided on the same surface of the solid electrolyte.
As shown in the figure. The measurement electrode 3 provided on the solid electrolyte 2 is in contact with the gas to be measured through the porous ceramic layer 5, and the reference electrode 4 is in contact with the atmosphere as it faces the hollow part 7 composed of airtight layers 6 and 8. ing. The airtight layer 9 may be a solid electrolyte or an insulating layer.
以上の説明から明らかなように、本発明の酸素
センサは、板状の固体電解質による酸素センサ素
子に磁器製のフランジを設けたので、素子をハウ
ジングに組込む工程が容易になり、さらに振動等
に対する耐久性が増し、その上磁器製フランジ上
に設けられた導電体を介して加熱用電流の供給を
行なうので信頼性の高い構成とすることができた
ものであり、本発明は産業の発達に寄与するとこ
ろ大なるものがある。 As is clear from the above description, in the oxygen sensor of the present invention, a porcelain flange is provided on an oxygen sensor element made of a plate-shaped solid electrolyte, which facilitates the process of assembling the element into a housing, and further improves resistance to vibrations, etc. The durability is increased, and since the heating current is supplied through the conductor provided on the porcelain flange, a highly reliable structure can be achieved. There is a lot to contribute.
第１図は本発明の素子の一具体例の展開を示す
説明図、第２Ａ図ないし第２Ｄ図は本発明のフラ
ンジ付素子の一具体例の平面図、正面図、側面
図、下面図を示す説明図、第３図は本発明の酸素
センサの組立構造を示す説明図、第４図は本発明
の金属端子を示す説明図、第５Ａ図ないし第５Ｄ
図は本発明のフランジ付素子の別の具体例の平面
図、正面図、側面図、下面図を示す説明図、第６
図ないし第１２図は本発明の素子の別の具体例の
展開を示す説明図である。
１…素子、２…固体電解質、３…測定電極、４
…基準電極、３′，４′…リード線の先端部、５…
多孔質セラミツク層、６，６′…気密層、７…中
空部、８…気密層、９…気密層、１０…気密層、
１１…ヒータ、１１′…ヒータの先端、１２…フ
ランジの取付部、１３…フランジ、１４，１５，
１６，１７…導電体、１８…コンタクトリング、
１９…金属製端子、２０…ハウジング、２１…碍
管、２２…絶縁体、２３…ワツシヤー、２４…碍
管、２５…キヤツプ、２６…皿バネ、２７…導
線、２８…引出線、２９…先端カバー、３０…開
口部、３１…被測定ガス側空間、３２…大気側空
間、３３…素子、３４…フランジ、３５…電極、
３５′…電極の先端部、３６…拡散孔、３７…キ
ヤビテイ、３８…固体電解質、３９…電極、３
９′…電極の先端部。
FIG. 1 is an explanatory diagram showing the development of a specific example of the element of the present invention, and FIGS. 2A to 2D are a plan view, a front view, a side view, and a bottom view of a specific example of the flanged element of the present invention. FIG. 3 is an explanatory diagram showing the assembly structure of the oxygen sensor of the present invention, FIG. 4 is an explanatory diagram showing the metal terminal of the present invention, and FIGS. 5A to 5D.
The figures are explanatory diagrams showing a plan view, a front view, a side view, and a bottom view of another specific example of the flanged element of the present invention, and
12 through 12 are explanatory diagrams showing the development of another specific example of the element of the present invention. 1 ...Element, 2...Solid electrolyte, 3...Measurement electrode, 4
...Reference electrode, 3', 4'...Tip of lead wire, 5...
Porous ceramic layer, 6, 6'... Airtight layer, 7... Hollow part, 8... Airtight layer, 9... Airtight layer, 10... Airtight layer,
DESCRIPTION OF SYMBOLS 11... Heater, 11'... Tip of heater, 12... Flange mounting part, 13... Flange, 14, 15,
16, 17... Conductor, 18... Contact ring,
19...Metal terminal, 20...Housing, 21...Insulator, 22...Insulator, 23...Washer, 24...Insulator tube, 25...Cap, 26...Disc spring, 27...Conductor, 28...Leader wire, 29...Tip cover, 30... Opening, 31... Measured gas side space, 32... Atmospheric side space, 33... Element, 34... Flange, 35... Electrode,
35'... Tip of electrode, 36... Diffusion hole, 37... Cavity, 38... Solid electrolyte, 39... Electrode, 3
9'...Tip of electrode.
Claims (1)
設けられた測定電極と、該固体電解質に密接しま
たは該固体電解質とともに酸素濃淡電池を構成す
る他の固体電解質に密接しかつ前記測定電極と分
離した基準電極とで酸素濃淡電池を構成し、該酸
素濃淡電池を構成する固体電解質または該酸素濃
淡電池に隣接する固体電解質に密接してヒータを
設けた酸素センサ素子において、該ヒータのリー
ド線と電気的に接続する導電体を大気側面に有す
る磁器製フランジを前記酸素センサ素子の端部で
固着し、該フランジが固着された前記酸素センサ
素子をハウジング２０に組込んだことを特徴とす
る酸素センサ。 ２ 酸素センサ素子に酸素ポンプを構成する１対
の電極が設けられている特許請求の範囲第１項記
載の酸素センサ。 ３ 酸素濃淡電池を構成する電極のうちの少なく
とも１つと、酸素ポンプを構成する電極のうちの
少なくとも１つを同一のものとした特許請求の範
囲第２項記載の酸素センサ。 ４ 酸素濃淡電池を構成する電極のうちの少なく
とも１つがヒータを兼ねる特許請求の範囲第１項
ないし第３項のいずれかに記載の酸素センサ。 ５ 酸素ポンプを構成する電極のうちの少なくと
も１つがヒータを兼ねる特許請求の範囲第２項な
いし第４項のいずれかに記載の酸素センサ。 ６ 磁器製フランジの表面に設けられた導電体に
磁器製フランジの形状で位置決めされた金属端子
を押圧して導電的に接触させてハウジングに組込
んだ特許請求の範囲第１項ないし第５項のいずれ
かに記載の酸素センサ。 ７ 板状の固体電解質と、該固体電解質の表面に
設けられた測定電極と、該固体電解質に密接しま
たは該固体電解質とともに酸素濃淡電池を構成す
る他の固体電解質に密接しかつ前記測定電極と分
離した基準電極とで酸素濃淡電池を構成し、該酸
素濃淡電池に隣接する絶縁層に密接してヒータを
設けた酸素センサ素子において、該ヒータのリー
ド線と電気的に接続する導電体を大気側面に有す
る磁器製フランジを前記酸素センサ素子の端部で
固着し、該フランジが固着された前記酸素センサ
素子をハウジングに組込んだことを特徴とする酸
素センサ。 ８ 酸素センサ素子に酸素ポンプを構成する１対
の電極が設けられている特許請求の範囲第７項記
載の酸素センサ。 ９ 酸素濃淡電池を構成する電極のうちの少なく
とも１つと、酸素ポンプを構成する電極のうちの
少なくとも１つとを同一のものとした特許請求の
範囲第７項記載の酸素センサ。 １０ 磁器製フランジの表面に設けられた導電体
に磁器製フランジの形状で位置決めされた金属端
子を押圧して導電的に接触させてハウジングに組
込んだ特許請求の範囲第７項ないし第９項のいず
れかに記載の酸素センサ。[Scope of Claims] 1. A plate-shaped solid electrolyte, a measuring electrode provided on the surface of the solid electrolyte, and a solid electrolyte that is in close contact with the solid electrolyte or in close contact with another solid electrolyte that constitutes an oxygen concentration battery together with the solid electrolyte. In the oxygen sensor element, the measuring electrode and a separate reference electrode constitute an oxygen concentration battery, and a heater is provided in close proximity to the solid electrolyte constituting the oxygen concentration battery or the solid electrolyte adjacent to the oxygen concentration battery. , a porcelain flange having a conductor on the atmospheric side that is electrically connected to the lead wire of the heater is fixed at the end of the oxygen sensor element, and the oxygen sensor element with the flange fixed is assembled into the housing 20. An oxygen sensor that is characterized by 2. The oxygen sensor according to claim 1, wherein the oxygen sensor element is provided with a pair of electrodes forming an oxygen pump. 3. The oxygen sensor according to claim 2, wherein at least one of the electrodes constituting the oxygen concentration battery and at least one of the electrodes constituting the oxygen pump are the same. 4. The oxygen sensor according to any one of claims 1 to 3, wherein at least one of the electrodes constituting the oxygen concentration battery also serves as a heater. 5. The oxygen sensor according to any one of claims 2 to 4, wherein at least one of the electrodes constituting the oxygen pump also serves as a heater. 6. Claims 1 to 5, in which a metal terminal positioned in the shape of a porcelain flange is pressed against a conductor provided on the surface of the porcelain flange to make conductive contact therewith and incorporated into the housing. The oxygen sensor according to any of the above. 7 A solid electrolyte in the form of a plate, a measuring electrode provided on the surface of the solid electrolyte, and a solid electrolyte that is in close contact with the solid electrolyte or in close contact with another solid electrolyte that constitutes an oxygen concentration battery together with the solid electrolyte, and with the measuring electrode. In an oxygen sensor element that constitutes an oxygen concentration battery with a separated reference electrode and has a heater provided in close contact with an insulating layer adjacent to the oxygen concentration battery, the conductor electrically connected to the lead wire of the heater is connected to the atmosphere. An oxygen sensor characterized in that a porcelain flange provided on a side surface is fixed at an end of the oxygen sensor element, and the oxygen sensor element to which the flange is fixed is assembled into a housing. 8. The oxygen sensor according to claim 7, wherein the oxygen sensor element is provided with a pair of electrodes constituting an oxygen pump. 9. The oxygen sensor according to claim 7, wherein at least one of the electrodes constituting the oxygen concentration battery and at least one of the electrodes constituting the oxygen pump are the same. 10 Claims 7 to 9, in which a metal terminal positioned in the shape of the porcelain flange is pressed against a conductor provided on the surface of the porcelain flange to bring it into conductive contact and incorporated into the housing. The oxygen sensor according to any of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58060848A JPS59187252A (en) | 1983-04-08 | 1983-04-08 | Oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58060848A JPS59187252A (en) | 1983-04-08 | 1983-04-08 | Oxygen sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59187252A JPS59187252A (en) | 1984-10-24 |
| JPH0410586B2 true JPH0410586B2 (en) | 1992-02-25 |
Family
ID=13154201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58060848A Granted JPS59187252A (en) | 1983-04-08 | 1983-04-08 | Oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59187252A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0623728B2 (en) * | 1985-02-14 | 1994-03-30 | 日本碍子株式会社 | Electrochemical device and manufacturing method thereof |
| JPH0789109B2 (en) * | 1985-09-30 | 1995-09-27 | 本田技研工業株式会社 | Oxygen concentration detector |
| JPS63149555A (en) * | 1986-12-13 | 1988-06-22 | Ngk Spark Plug Co Ltd | Assembling structure of detection element |
| JPH01221654A (en) * | 1988-03-01 | 1989-09-05 | Japan Electron Control Syst Co Ltd | Enzyme sensor for internal combustion engine |
| US4980044A (en) * | 1989-03-31 | 1990-12-25 | General Motors Corporation | Oxygen sensor having a flat plate element and heater |
| JPH0754850Y2 (en) * | 1989-05-31 | 1995-12-18 | 京セラ株式会社 | Oxygen sensor with heater |
| JP4628920B2 (en) * | 2005-10-05 | 2011-02-09 | 日本碍子株式会社 | Gas sensor element |
| JP2009180634A (en) * | 2008-01-31 | 2009-08-13 | Ngk Insulators Ltd | Plate-like sensor element |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55116248A (en) * | 1979-02-23 | 1980-09-06 | Bosch Gmbh Robert | Electrochemical feeler for measuring oxygen content of gas |
| JPS5827052A (en) * | 1981-08-12 | 1983-02-17 | Mitsubishi Electric Corp | Oxygen gas sensor |
-
1983
- 1983-04-08 JP JP58060848A patent/JPS59187252A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55116248A (en) * | 1979-02-23 | 1980-09-06 | Bosch Gmbh Robert | Electrochemical feeler for measuring oxygen content of gas |
| JPS5827052A (en) * | 1981-08-12 | 1983-02-17 | Mitsubishi Electric Corp | Oxygen gas sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59187252A (en) | 1984-10-24 |
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