JPH046460A - Oxygen-concentration sensor - Google Patents
Oxygen-concentration sensorInfo
- Publication number
- JPH046460A JPH046460A JP2107514A JP10751490A JPH046460A JP H046460 A JPH046460 A JP H046460A JP 2107514 A JP2107514 A JP 2107514A JP 10751490 A JP10751490 A JP 10751490A JP H046460 A JPH046460 A JP H046460A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- resistance
- temperature
- cell
- oxygen concentration
- 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
- 239000001301 oxygen Substances 0.000 claims abstract description 47
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 47
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000007784 solid electrolyte Substances 0.000 claims description 15
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 230000032258 transport Effects 0.000 claims 1
- 238000005086 pumping Methods 0.000 abstract description 20
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 abstract 3
- 238000001514 detection method Methods 0.000 description 10
- 239000004020 conductor Substances 0.000 description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 150000002926 oxygen Chemical class 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は酸素濃度センサ、特に酸素イオン伝導性固体電
解質を用いた酸素濃度センサに係る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an oxygen concentration sensor, and particularly to an oxygen concentration sensor using an oxygen ion conductive solid electrolyte.
ご従来の技術：
第８図を参照して従来の酸素濃度センサを説明する。セ
ンシング素子１のポンピングセル１０１ は酸素イオン
伝導性固体電解質であるジルコニアからなり、ヒータ１
０２ との間にチャンバ１０３を形成し、ポンピングセ
ル１０１はチャンバ１０３内から酸素を吸い出し、周囲
に放出する。この酸素吸い出しの際にポンピングセル１
０１中を流れる電流は、周囲ガス中の酸素濃度に比例す
る。この電流が酸素濃度センサの出力となる。Conventional technology: A conventional oxygen concentration sensor will be explained with reference to FIG. The pumping cell 101 of the sensing element 1 is made of zirconia, which is an oxygen ion conductive solid electrolyte, and the heater 1
02, and the pumping cell 101 sucks out oxygen from inside the chamber 103 and releases it to the surroundings. During this oxygen suction, pumping cell 1
The current flowing through 01 is proportional to the oxygen concentration in the surrounding gas. This current becomes the output of the oxygen concentration sensor.
このセンサは、精度を保証するためにはチャンバ１０３
内外の酸素濃度の比を一定に保つ必要がある。This sensor must be installed in chamber 103 to ensure accuracy.
It is necessary to keep the ratio of internal and external oxygen concentrations constant.
（センサ端子間の電圧）
（起電力）＋（センサ内部抵抗にかかる電圧）〔ここに
起電力は、チャンバ１０３内外の酸素濃度比に対応する
〕
の関係があるので、検出回路２において、センシング素
子１の内部抵抗Ｒ３と電流検出抵抗Ｒ３との比率と同じ
比率の抵抗Ｒ３，Ｒ２を組み合わせることによって起電
力（チャンバ１０３内外の酸素濃度比）を一定にしてい
る。(voltage between sensor terminals) (electromotive force) + (voltage applied to sensor internal resistance) [Here, the electromotive force corresponds to the ratio of oxygen concentration inside and outside the chamber 103] Therefore, in the detection circuit 2, the sensing By combining resistors R3 and R2 having the same ratio as the internal resistance R3 of the element 1 and the current detection resistor R3, the electromotive force (ratio of oxygen concentration inside and outside the chamber 103) is kept constant.
上記において、センシング素子１の温度が変化すると、
内部抵抗Ｒｓが変化して起電力を一定にできず、正確な
酸素濃度測定ができなくなるという問題がある。In the above, when the temperature of the sensing element 1 changes,
There is a problem in that the internal resistance Rs changes and the electromotive force cannot be kept constant, making it impossible to accurately measure oxygen concentration.
そこで、本発明は、温度が変化しても起電力を一定に保
ち、正確な酸素濃度測定ができるようにすることを目的
とする。Therefore, an object of the present invention is to maintain the electromotive force constant even when the temperature changes, and to enable accurate oxygen concentration measurement.
本発明は、上記目的を達成するために、酸素イオン伝導
性固体電解質の一方の側面は雰囲気に開放されて接し、
他方の側面は酸素分子拡散制限手段を介して雰囲気に接
し、該固体電解質の両側面間に電圧を印加して該酸素分
子拡散制限手段側から開放側へ酸素を輸送し、両端側の
酸素濃度比を一定にし、その電流れる電流を検出して雰
囲気中の酸素濃度を測定する酸素濃度センサにおいて、
該固体電解質の抵抗−温度特性を補償する抵抗−温度特
性を有する電気抵抗素子を、該固体電解質と直列に接続
し、該固体電解質と該電気抵抗素子の結合体の両端に一
定電圧を印加することを特徴とする酸素濃度センサを提
供する。In order to achieve the above object, the present invention has one side surface of an oxygen ion conductive solid electrolyte that is open and in contact with the atmosphere,
The other side is in contact with the atmosphere via an oxygen molecule diffusion restriction means, and a voltage is applied between both sides of the solid electrolyte to transport oxygen from the oxygen molecule diffusion restriction means side to the open side, thereby reducing the oxygen concentration at both ends. In the oxygen concentration sensor, which measures the oxygen concentration in the atmosphere by keeping the ratio constant and detecting the current flowing,
An electrical resistance element having resistance-temperature characteristics that compensates for the resistance-temperature characteristics of the solid electrolyte is connected in series with the solid electrolyte, and a constant voltage is applied across the combination of the solid electrolyte and the electrical resistance element. An oxygen concentration sensor is provided.
本発明では、ポンピングセル１０１ と逆の温度−抵抗
特性を持つ抵抗素子１０４をポンピングセルと電気的に
直列に接続したことによって、センサ温度が変わっても
、ポンピングセル１０１の内部抵抗Ｒ５と抵抗素子１０
４の抵抗Ｒ０の合成抵抗が変わらない。したがって、セ
ンシング素子１の温度に関わらず、起電力を一定に保つ
ことができ、正確な酸素濃度測定が可能である。In the present invention, by electrically connecting the resistance element 104 having temperature-resistance characteristics opposite to that of the pumping cell 101 in series with the pumping cell, even if the sensor temperature changes, the internal resistance R5 of the pumping cell 101 and the resistance element 10
The combined resistance of the four resistors R0 remains unchanged. Therefore, the electromotive force can be kept constant regardless of the temperature of the sensing element 1, and accurate oxygen concentration measurement is possible.
第１図にセンサの模式的構成、第２図にアッセンブリ構
成を示す。FIG. 1 shows a schematic configuration of the sensor, and FIG. 2 shows an assembly configuration.
１はセンシング素子で、第１図では正面図とともに平面
図、側面図も描かれている。1 is a sensing element, and FIG. 1 shows a front view, a plan view, and a side view.
１０１はポンピングセルである。ポンピングセル１０１
は板状のジルコニア等の酸素イオン伝導性固体電解質で
、その裏表面にそれぞれ多孔質の薄膜状貴金属電極１０
１１ 、１０１２を設けている。101 is a pumping cell. Pumping cell 101
is a plate-shaped oxygen ion conductive solid electrolyte such as zirconia, and a porous thin film noble metal electrode 10 is provided on the back surface of the solid electrolyte.
11 and 1012 are provided.
１０２はヒータである。ヒータ１０２は板状の電気絶縁
材料の表面に電熱線１０２１を印刷したものである。102 is a heater. The heater 102 is a plate-shaped electrically insulating material with heating wires 1021 printed on the surface thereof.
１０２２ 、１０２３は電熱線１０２１の端子である。1022 and 1023 are terminals of the heating wire 1021.
１０４は抵抗素子である。抵抗素子１０４は「コ」の字
形の切り欠きを持つ板状の物（正特性サーミスタ）で、
その抵抗値Ｒ丁は第３図に示すように温度に対して、ポ
ンピングセルの内部抵抗Ｒ３と逆の特性を持っている。104 is a resistance element. The resistive element 104 is a plate-shaped object (positive temperature coefficient thermistor) with a U-shaped notch.
As shown in FIG. 3, the resistance value R3 has a characteristic opposite to the internal resistance R3 of the pumping cell with respect to temperature.
この抵抗素子はポンピングセルの内部抵抗の温度特性を
補償するものを選択するが、例えば（Ｂａ−３ｒ−Ｐｂ
）Ｔｉｅ３焼結体などが用いられる。This resistance element is selected to compensate for the temperature characteristics of the internal resistance of the pumping cell. For example, (Ba-3r-Pb
) Tie3 sintered body etc. are used.
抵抗素子１０４は、ポンピングセル１０１ とヒータ１
０２に挟まれて積層され、その「コ」の字形の切り欠き
の部分は、チャンバ１０３ となっている。The resistance element 104 is connected to the pumping cell 101 and the heater 1
02 and the U-shaped notch serves as a chamber 103.
ポンピングセル１０１の電極１０１２と抵抗素子１０４
は、互いに接しており、電気的には直列に配置されてい
る。Electrode 1012 and resistance element 104 of pumping cell 101
are in contact with each other and are electrically arranged in series.
抵抗素子１０４には、端子１０４１が、ポンピングセル
１０１の電極１０１１には、端子１０１３が設けられて
いる。The resistance element 104 is provided with a terminal 1041, and the electrode 1011 of the pumping cell 101 is provided with a terminal 1013.
端子１０４１は接地されている。Terminal 1041 is grounded.
２は検出回路である。検出回路２はオペアンプ２０１、
定電圧電源２０２、電流検出抵抗ＲＩ 、調整抵抗Ｒ２
，Ｒ３から成る。電流検出抵抗Ｒ０は、端がポンピング
セル１０１の端子１０１３、オペアンプ２０１の入力２
０１１、出力端子２０と結線されており、他の一端がオ
ペアンプ２０１の出力２０１３、出力端子２０４と結線
されている。調整抵抗Ｒ２は、一端がオペアンプ２０１
の人力２０１２、調整抵抗Ｒ３と結線されており、他の
一端がオペアンプ２０１の出力２０１３と結線されてい
る。調整抵抗Ｒ３の上述のＲ２と結線されていない側は
、定電圧電源２０２の正電位側と結線されている。定電
圧電源２０２の負電位側は接地されている。2 is a detection circuit. The detection circuit 2 is an operational amplifier 201,
Constant voltage power supply 202, current detection resistor RI, adjustment resistor R2
, R3. The current detection resistor R0 has one end connected to the terminal 1013 of the pumping cell 101 and the input 2 of the operational amplifier 201.
011 is connected to the output terminal 20, and the other end is connected to the output 2013 of the operational amplifier 201 and the output terminal 204. One end of the adjustment resistor R2 is connected to the operational amplifier 201.
The other end is connected to the output 2013 of the operational amplifier 201. The side of the adjustment resistor R3 that is not connected to the above-mentioned R2 is connected to the positive potential side of the constant voltage power supply 202. The negative potential side of constant voltage power supply 202 is grounded.
ボンピングセル１０１の内部抵抗Ｒ５、抵抗素子の抵抗
ＲＴ、電流検出抵抗Ｒ１、調整抵抗Ｒ２，Ｒ３は、
（ＲＴ ＋Ｒ５）／Ｒ＋ ＝Ｒ３／Ｒ２の関係を持っ
ている。The internal resistance R5 of the bombing cell 101, the resistance RT of the resistance element, the current detection resistance R1, and the adjustment resistances R2 and R3 have a relationship of (RT + R5)/R+ = R3/R2.
３０１は外カバー、３０２は内カバー、３０３はカバー
ホルダである。外カバー３０１、内カバー３０２は、そ
れぞれ、ガス導入孔３０１１ 、３０２１が設けである
。301 is an outer cover, 302 is an inner cover, and 303 is a cover holder. The outer cover 301 and the inner cover 302 are provided with gas introduction holes 3011 and 3021, respectively.
外カバー３０１ と内カバー３０２、外カバー３０１
とカバーホルダ３０３はそれぞれ溶接によって結合され
ている。Outer cover 301, inner cover 302, outer cover 301
and cover holder 303 are each coupled by welding.
４０１はハウジング、４０２．４０４は無機接着剤、４
０３はガラス、４０５は導線部ハウジング、４０６はコ
ネクタホルダ、４０７はコネクタ、４０８はコネクタホ
ルダエンド、４０９はヒータ導線で、４０９１はヒータ
高圧側導線、４０９２はヒータ接地側導線である。401 is a housing, 402.404 is an inorganic adhesive, 4
03 is glass, 405 is a conductor housing, 406 is a connector holder, 407 is a connector, 408 is a connector holder end, 409 is a heater conductor, 4091 is a heater high voltage side conductor, and 4092 is a heater ground side conductor.
４１０は信号検出用導線で、４１０１は接地側導線、４
１０２は信号側導線である。410 is a signal detection conductor, 4101 is a grounding conductor, 4
102 is a signal side conducting wire.
上述の４０１〜４０８までの各構成要素は、円柱または
円筒形状を成し、第２図の如く配置されている。Each of the above-mentioned components 401 to 408 has a columnar or cylindrical shape and is arranged as shown in FIG.
ハウジング４０１ と導線部ハウジング４０５は溶接に
より結合され、導線部ハウジング４０５はコネクタホル
ダエンド４０８のところでカシメられている。The housing 401 and the conductor housing 405 are joined together by welding, and the conductor housing 405 is caulked at the connector holder end 408.
５はガスケットである。5 is a gasket.
ヒータ１０２ に通電してボンピングセル１０１を加熱
し、ボンピングセル１０１ に電流を流すと、電極１０
１２では、
０２″−４ｅ→２０２
の電気化学反応によってボンピングセル中へ酸素の注入
が起こる。When the heater 102 is energized to heat the bombing cell 101 and a current is passed through the bombing cell 101, the electrode 10
At 12, oxygen injection into the bombing cell occurs through the electrochemical reaction 02''-4e→202.
一方、電極１０１１では、
２０２−−０２ ＋ ４ ｅ
の反応によって酸素の放出が生じる。これは酸素ポンプ
作用として知られている。この酸素ポンプ作用によって
、チャンバ１０３内では、雰囲気中よりも酸素濃度が低
くなる。On the other hand, at the electrode 1011, oxygen is released due to the reaction 202-02+4e. This is known as oxygen pumping. Due to this oxygen pumping action, the oxygen concentration in the chamber 103 is lower than in the atmosphere.
ここで、チャンバ１０３内と雰囲気中の酸素濃度の比が
一定の時に、上述の酸素ポンプ作用に要する電流（以下
ボンピング電流と称す）は、雰囲気中の酸素濃度に比例
する。Here, when the ratio of the oxygen concentration in the chamber 103 and the atmosphere is constant, the current required for the above-mentioned oxygen pumping action (hereinafter referred to as a pumping current) is proportional to the oxygen concentration in the atmosphere.
ところで、ボンピングセル１０１の両端で酸素濃度が違
う場合、濃淡電池作用によって、ボンピングセル１０１
の端子間に起電力が発生する。したがってチャンバ１０
３内と雰囲気中の酸素濃度の比を一定にするには、上述
の起電力を一定にすれば良い。By the way, when the oxygen concentration is different at both ends of the bombing cell 101, the concentration cell action
An electromotive force is generated between the terminals. Therefore chamber 10
In order to keep the ratio of the oxygen concentration in the atmosphere and the inside of the atmosphere constant, the above-mentioned electromotive force may be kept constant.
（ボンピングセル１０１の端子間の電圧）（起電力）＋
（ボンピングセル１０１の内部抵抗Ｒ５に加わる電圧）
の関係があるので、ボンピングセル１０１の内部抵抗Ｒ
ｓの変化に合わせてボンピングセル１０１の端子間の電
圧を変化させれば起電力が一定になる。(Voltage between terminals of bombing cell 101) (electromotive force) +
(Voltage applied to the internal resistance R5 of the bombing cell 101) Since there is a relationship, the internal resistance R of the bombing cell 101 is
If the voltage between the terminals of the bombing cell 101 is changed in accordance with the change in s, the electromotive force becomes constant.
オペアンプ２０１の人力２０１１と２０１２は同電位と
なり、
（ＲＴ ＋Ｒｓ ）／Ｒ１＝Ｒｓ ／Ｒ２（ＲＴ ＋Ｒ
ｓ ） ＝一定
の関係から、ボンピングセル１０１の端子間の電圧は、
ボンピングセル１０１の内部抵抗Ｒ８と同時に変化する
たｔ、起電力は常に一定となり、ボンピング電流は、セ
ンサ温度に関係無く雰囲気中の酸素濃度に比例する。ボ
ンピング電流は、出力端子２０３、２０４の端子間の電
位差にて検出される。The human power 2011 and 2012 of the operational amplifier 201 have the same potential, and (RT +Rs)/R1=Rs/R2(RT +R
s ) = From a constant relationship, the voltage between the terminals of the bombing cell 101 is:
Although the internal resistance R8 of the bombing cell 101 changes at the same time, the electromotive force is always constant, and the bombing current is proportional to the oxygen concentration in the atmosphere regardless of the sensor temperature. The bombing current is detected by the potential difference between the output terminals 203 and 204.
第４図に第二の実施例を示す。この実施例では、ヒータ
１０２を中にして、絶縁材１０５．１０６を介して、抵
抗素子１０４、ボンピングセル１０１を積層している。FIG. 4 shows a second embodiment. In this embodiment, a resistance element 104 and a bombing cell 101 are stacked with a heater 102 in between and insulating materials 105 and 106 interposed therebetween.
第５図に第三の実施例を示す。この実施例では、絶縁材
１０５を中にして、抵抗素子１０４、ボンピングセル１
０１で挟んで積層し、さらにその外側にヒータ１０２−
１． １０２−２を設けている。FIG. 5 shows a third embodiment. In this embodiment, the resistive element 104 and the bombing cell 1 are placed inside the insulating material 105.
The heater 102-
1. 102-2 is provided.
第６図に第四の実施例を示す。この実施例では、ヒータ
１０２ にピンホール１０２４を設け、チャンバ１０３
の開口部としている。FIG. 6 shows a fourth embodiment. In this embodiment, a pinhole 1024 is provided in the heater 102 and the chamber 103 is provided with a pinhole 1024.
It has an opening.
第７図に第五の実施例を示す。この実施例では、電極１
０１１上を多孔質層１０７て覆っている。FIG. 7 shows a fifth embodiment. In this example, electrode 1
011 is covered with a porous layer 107.
以上述べた実施例では、ボンピングセルの陰極と雰囲気
の間にスリット、ピンホール、多孔質を設けたが、これ
らは、酸素輸送を制限する手段であれば良い。In the embodiments described above, slits, pinholes, and porous materials were provided between the cathode of the bombing cell and the atmosphere, but these may be used as long as they limit oxygen transport.
口発明の効果〕
本発明の酸素濃度センサは、酸素イオン伝導性固体電解
質の内部抵抗−温度特性を補償する電気抵抗素子を設け
たことにより、センサの出力が温度に依存せず、一定に
される効果がある。[Effects of the Invention] The oxygen concentration sensor of the present invention is provided with an electric resistance element that compensates for the internal resistance-temperature characteristics of the oxygen ion-conducting solid electrolyte, so that the output of the sensor is independent of temperature and is kept constant. It has the effect of
第１図は酸素濃度センサの模式的構成図、第２図は酸素
濃度センサの全体断面図、第３図はポンピングセルと電
気抵抗素子の抵抗−温度特性図、第４〜７図は酸素濃度
センサの他の実施例の模式断面図及び側面図、第８図は
従来技術の酸素濃度センサの模式的構成図である。
１０１・・・ボンピングセルベ １０２＝−・ヒータ
、１０３・・・チャンバ、 １０４・・・抵抗
素子。
第 １図
センシング素子
１０１ ボンピングセル
１０２ ヒータ
１０３ チャンバ
１０４ 抵抗素子
２ 検出回路
２０１ オペアンプ
温度
第３図
第４図
第
図
第
図
第
図
１０１ ボンピングセル
１０２ ヒータ
１０３ チャンバ
検出回路
２０１ オペアンプFigure 1 is a schematic configuration diagram of the oxygen concentration sensor, Figure 2 is an overall sectional view of the oxygen concentration sensor, Figure 3 is a resistance-temperature characteristic diagram of the pumping cell and electrical resistance element, and Figures 4 to 7 are oxygen concentration A schematic sectional view and a side view of another embodiment of the sensor, and FIG. 8 is a schematic configuration diagram of a conventional oxygen concentration sensor. 101...Bonping cell 102=--Heater, 103...Chamber, 104...Resistance element. Figure 1 Sensing element 101 Bumping cell 102 Heater 103 Chamber 104 Resistance element 2 Detection circuit 201 Operational amplifier temperature Figure 3 Figure 4 Figure Figure 101 Bumping cell 102 Heater 103 Chamber detection circuit 201 Operational amplifier
Claims (1)
に開放されて接し、他方の側面は酸素分子拡散制限手段
を介して雰囲気に接し、該固体電解質の両側面間に電圧
を印加して該酸素分子拡散制限手段側から開放側へ酸素
を輸送し、両端側の酸素濃度比を一定にし、その際流れ
る電流を検出して雰囲気中の酸素濃度を測定する酸素濃
度センサにおいて、該固体電解質の抵抗−温度特性を補
償する抵抗−温度特性を有する電気抵抗素子を、該固体
電解質と直列に接続し、該固体電解質と該電気抵抗素子
の結合体の両端に一定電圧を印加することを特徴とする
酸素濃度センサ。1. One side of the oxygen ion conductive solid electrolyte is open and in contact with the atmosphere, the other side is in contact with the atmosphere via an oxygen molecule diffusion limiting means, and a voltage is applied between both sides of the solid electrolyte to In an oxygen concentration sensor that transports oxygen from the oxygen molecule diffusion restriction means side to the open side, keeps the oxygen concentration ratio at both ends constant, and measures the oxygen concentration in the atmosphere by detecting the current flowing at this time, the solid electrolyte An electric resistance element having a resistance-temperature characteristic that compensates for the resistance-temperature characteristic is connected in series with the solid electrolyte, and a constant voltage is applied to both ends of the combination of the solid electrolyte and the electric resistance element. Oxygen concentration sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2107514A JPH046460A (en) | 1990-04-25 | 1990-04-25 | Oxygen-concentration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2107514A JPH046460A (en) | 1990-04-25 | 1990-04-25 | Oxygen-concentration sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH046460A true JPH046460A (en) | 1992-01-10 |
Family
ID=14461135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2107514A Pending JPH046460A (en) | 1990-04-25 | 1990-04-25 | Oxygen-concentration sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH046460A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1324028A1 (en) * | 1996-11-08 | 2003-07-02 | Ngk Spark Plug Co., Ltd | Method and apparatus for measuring oxygen concentration and nitrogen oxide concentration. |
-
1990
- 1990-04-25 JP JP2107514A patent/JPH046460A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1324028A1 (en) * | 1996-11-08 | 2003-07-02 | Ngk Spark Plug Co., Ltd | Method and apparatus for measuring oxygen concentration and nitrogen oxide concentration. |
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