JP3104291B2 - NOX sensor - Google Patents
NOX sensorInfo
- Publication number
- JP3104291B2 JP3104291B2 JP03132885A JP13288591A JP3104291B2 JP 3104291 B2 JP3104291 B2 JP 3104291B2 JP 03132885 A JP03132885 A JP 03132885A JP 13288591 A JP13288591 A JP 13288591A JP 3104291 B2 JP3104291 B2 JP 3104291B2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- chamber
- sensor
- electrodes
- pump
- 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 - Fee Related
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＮＯX センサに関す
る。The present invention relates, on the NO X sensor.
【０００２】[0002]
【従来の技術】或る雰囲気中に含有される窒素酸化物例
えば、エンジン等の内燃機関から排出される排気ガス中
に含まれるＮＯ、ＮＯ2 等の窒素酸化物（以下「Ｎ
ＯX 」という）の濃度を検出するセンサとしてＮＯX セ
ンサがある。このＮＯX センサは、濃淡電池式のセンサ
で、ガス中の酸素濃度を検出するＯ2 センサを基本とし
て構成されている。2. Description of the Related Art Nitrogen oxides contained in a certain atmosphere, for example, nitrogen oxides such as NO and NO 2 contained in exhaust gas discharged from an internal combustion engine such as an engine (hereinafter referred to as "N
As a sensor for detecting the concentration of O X "hereinafter) is NO X sensor. This NO X sensor is a concentration cell type sensor and is basically configured based on an O 2 sensor that detects the oxygen concentration in gas.
【０００３】[0003]
【発明が解決しようとする課題】ところで、従来の濃淡
電池式のＮＯX センサは、被測定ガス中の任意のＮＯX
濃度変化に対する出力変化が当該ガス中の酸素の分圧の
影響を受けるために一定ではなく、被測定ガス中の酸素
分圧が既知であることが必要であり、この酸素分圧を検
出するためのセンサを必要とし、しかも、検出された酸
素分圧に基づいてＮＯX 濃度を補正する必要があり、Ｎ
ＯX 濃度を検出することが困難である。また、高酸素分
圧領域における任意のＮＯX 濃度変化による出力変化が
小さく、検出感度が低下する等の問題がある。[SUMMARY OF THE INVENTION Incidentally, NO X sensor of a conventional concentration cell type may be any of the NO X in the measurement gas
The output change with respect to the concentration change is not constant because it is affected by the partial pressure of oxygen in the gas, and the oxygen partial pressure in the gas to be measured needs to be known. sensor requires, moreover, it is necessary to correct the NO X concentration based on the detected oxygen partial pressure, N
It is difficult to detect the OX concentration. Also, output change due to any of the NO X concentration change in the high oxygen partial pressure region is small, there is a problem that the detection sensitivity is lowered.
【０００４】本発明は上述の点に鑑みてなされたもの
で、窒素酸化物の濃度を簡単に検出することが可能なＮ
ＯX センサを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been developed in view of the fact that N can easily detect the concentration of nitrogen oxide.
It is intended to provide an OX sensor.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に本発明によれば、酸素イオン伝導性固体電解質部材に
より大気を導入する第１室と被測定ガスを導入する第
２、第３室とを形成し、第１室と第２及び第３室との隔
壁を挟んで夫々電極を設けて第１、第２の酸素センサを
形成し、第２、第３室の各側壁の内外面に夫々電極を設
けてこれらの各室内の酸素を室外に汲み出す第１、第２
の酸素ポンプを形成し、前記第２室と第３室とを酸素イ
オンの伝導を遮断する絶縁部材により画成し、前記第２
の酸素ポンプの第３室内における電極に導入された被測
定ガス中の窒素酸化物を窒素と酸素とに分解する触媒を
担持し、前記第１の酸素センサの出力を設定値に保持す
べく前記第１の酸素ポンプを制御し、前記第２の酸素セ
ンサの出力を前記設定値とすべく前記第２の酸素ポンプ
を制御し、これらの第１及び第２の酸素ポンプの制御電
流の差により前記窒素酸化物の濃度を検出するように構
成したものである。According to the present invention, in order to achieve the above object, a first chamber for introducing atmospheric air and a second and third chamber for introducing a gas to be measured by an oxygen ion conductive solid electrolyte member. And first and second oxygen sensors are formed by providing electrodes respectively with a partition between the first chamber and the second and third chambers interposed therebetween, and inner and outer surfaces of respective side walls of the second and third chambers. The first and second pumps are provided with electrodes to pump oxygen in each of these chambers out of the room.
The second chamber and the third chamber are defined by an insulating member that blocks conduction of oxygen ions.
A catalyst for decomposing nitrogen oxides in the gas to be measured introduced into the electrodes in the third chamber of the oxygen pump into nitrogen and oxygen, and maintaining the output of the first oxygen sensor at a set value. A first oxygen pump is controlled, and the second oxygen pump is controlled so that the output of the second oxygen sensor becomes the set value. The difference between the control currents of the first and second oxygen pumps It is configured to detect the concentration of the nitrogen oxide.
【０００６】[0006]
【作用】第１室に大気を、第２、第３室に被測定ガスを
導入し、第１室と第２室間に設けられた第１の酸素セン
サにより当該第２室内の酸素濃度を検出し、当該酸素濃
度が常に設定値となるように当該第２室内の第１の酸素
ポンプを制御する。第３室内に導入された被測定ガス中
に含有される窒素酸化物は、第２の酸素ポンプの電極に
担持された触媒の作用により窒素と酸素とに分解され、
従って、当該第３室内の酸素量は、第２室内の酸素量よ
りも前記分解された分量だけ増加する。第１室と第３室
との間に設けられた第２の酸素センサの出力が前記設定
値となるように当該第３室の第２の酸素ポンプを制御す
る。そして、第２、第１の酸素ポンプの制御電流の差を
検出する。この検出せる電流差により被測定ガス中の窒
素酸化物の濃度を検出する。The atmosphere is introduced into the first chamber, the gas to be measured is introduced into the second and third chambers, and the oxygen concentration in the second chamber is measured by a first oxygen sensor provided between the first and second chambers. Then, the first oxygen pump in the second chamber is controlled so that the detected oxygen concentration always becomes a set value. Nitrogen oxides contained in the gas to be measured introduced into the third chamber are decomposed into nitrogen and oxygen by the action of the catalyst carried on the electrode of the second oxygen pump,
Therefore, the amount of oxygen in the third chamber is greater than the amount of oxygen in the second chamber by the decomposed amount. The second oxygen pump in the third chamber is controlled so that the output of the second oxygen sensor provided between the first chamber and the third chamber becomes the set value. Then, a difference between the control currents of the second and first oxygen pumps is detected. The concentration of nitrogen oxide in the gas to be measured is detected from the detected current difference.
【０００７】[0007]
【実施例】以下本発明の一実施例を添付図面に基づいて
詳述する。図１においてＮＯX センサ１の本体２は、細
長い箱形をなし、中央の隔壁２ａを挟んで両側に細長い
室３と、当該室３よりも小さい２つの室４、５とが長手
方向に沿って設けられており、室３は、一端が隔壁６に
より閉塞され、他端が開口され、室４の閉塞端２ｄの一
部は隔壁７により形成されている。また、室４と５と
は、隔壁８により画成され、且つ同じ形状及び大きさに
形成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, a main body 2 of the NO X sensor 1 has an elongated box shape, and an elongated chamber 3 and two chambers 4 and 5 smaller than the chamber 3 are arranged along a longitudinal direction on both sides of a central partition wall 2a. One end of the chamber 3 is closed by a partition 6, the other end is opened, and a part of the closed end 2 d of the chamber 4 is formed by a partition 7. The chambers 4 and 5 are defined by a partition wall 8 and have the same shape and size.
【０００８】本体２は、酸素イオン伝導性固体電解質部
材により形成されており、隔壁６〜８は、前記酸素イオ
ンの流れを遮断する絶縁部材により形成されている。酸
素イオン伝導性固体電解質部材は、例えば、酸化ジルコ
ニウム（ＺｒＯ2 ）に少量の酸化イットリウム（Ｙ2 Ｏ
3 ）を固溶したものがある。隔壁６は、室３の一端にお
いて中央の隔壁２ａの先端と側壁２ｂの先端との間を遮
断絶縁し、隔壁７は、室４の閉塞端２ｄと中央の隔壁２
ａの先端との間を絶縁し、隔壁８は、一端が中央の隔壁
２ａを、他端が側壁２ｃを夫々貫通して室４と５とを絶
縁しており、隔壁２ａと側壁２ｂ、２ｃとの間及び室４
と５との間における酸素イオンの伝導を遮断している。
また、側壁２ｃには室４、５に連通する孔２ｅ、２ｆが
穿設されており、これらの孔２ｅ、２ｆは、同径とされ
ている。The main body 2 is formed of an oxygen ion conductive solid electrolyte member, and the partitions 6 to 8 are formed of an insulating member for blocking the flow of oxygen ions. The oxygen ion conductive solid electrolyte member is formed, for example, by adding a small amount of yttrium oxide (Y 2 O) to zirconium oxide (ZrO 2 ).
3 ) There is a solid solution. The partition 6 insulates and insulates between the end of the central partition 2a and the tip of the side wall 2b at one end of the chamber 3, and the partition 7 is connected to the closed end 2d of the chamber 4 and the central partition 2
a partition wall 8 has one end penetrating the center partition wall 2a and the other end penetrating the side wall 2c to insulate the chambers 4 and 5 from each other, and the partition wall 2a and the side walls 2b and 2c are insulated. Between and room 4
And 5 are blocked from conducting oxygen ions.
Holes 2e and 2f communicating with the chambers 4 and 5 are formed in the side wall 2c, and these holes 2e and 2f have the same diameter.
【０００９】中央の隔壁２ａの室４、５内の壁面には電
極１１、１３が設けられており、当該隔壁２ａの室３内
の壁面にはこれらの電極１１、１３と対抗して電極１
２、１４が設けられている。更に、側壁２ｃの室４、５
内の壁面には電極１５、１７が設けられており、当該側
壁２ｃの外面には電極１５、１７と対抗して電極１６、
１８が設けられている。これらの電極１１〜１８は、例
えば、白金（Ｐｔ）により形成されている。また、室４
内の電極１５にはＮＯX を分解するための触媒例えば、
Ｃｕ／ゼオライト触媒２０が担持されている。このＣｕ
／ゼオライト触媒２０は、室４内の酸素濃度が過剰な状
態においても導入された排気ガス中に含有されるＮＯX
を、Ｎ2 とＯ2 とに分解する。また、この側壁２ｃには
ヒータ２３が内蔵されており、昇温特性の改善、Ｃｕ／
ゼオライト触媒２０及びセンサ温度の安定化を図るよう
になっている。Electrodes 11 and 13 are provided on the inner walls of the chambers 4 and 5 of the central partition 2a, and the electrodes 1 and 13 are provided on the inner wall of the chamber 3 of the partition 2a in opposition to these electrodes 11 and 13.
2 and 14 are provided. Furthermore, the chambers 4 and 5 of the side wall 2c
Electrodes 15 and 17 are provided on the inner wall surface, and electrodes 16 and 17 are provided on the outer surface of the side wall 2 c in opposition to the electrodes 15 and 17.
18 are provided. These electrodes 11 to 18 are formed of, for example, platinum (Pt). Room 4
Catalysts such as for decomposing NO X in the electrode 15 of the inner,
A Cu / zeolite catalyst 20 is supported. This Cu
/ The zeolite catalyst 20 is capable of reducing the NO x contained in the exhaust gas introduced even when the oxygen concentration in the chamber 4 is excessive.
Is decomposed into N 2 and O 2 . Further, a heater 23 is built in the side wall 2c to improve the temperature rising characteristic and to improve the Cu /
The temperature of the zeolite catalyst 20 and the temperature of the sensor are stabilized.
【００１０】電極１１、１２とこれらの両電極間に介在
された隔壁２ａ、電極１３、１４とこれらの両電極間に
介在された隔壁２ａとにより夫々酸素センサ２５、２６
が形成される。また、電極１５、１６とこれらの両電極
間に介在された側壁２ｃ、電極１７、１８とこれらの両
電極間に介在された側壁２ｃとにより夫々酸素ポンプ２
７、２８が形成される。そして、これらの酸素センサ２
５、２６は、ＮＯX 検出回路の電圧検出部に、酸素ポン
プ２７、２８は、当該ＮＯX 検出回路のポンプ電流制御
部（何れも図示せず）に接続される。The oxygen sensors 25, 26 are respectively formed by the electrodes 11, 12 and the partition 2a interposed between these two electrodes, and the electrodes 13, 14 and the partition 2a interposed between these two electrodes.
Is formed. The electrodes 15 and 16 and the side walls 2c interposed between these two electrodes, and the electrodes 17 and 18 and the side walls 2c interposed between these two electrodes are used to form the oxygen pump 2 respectively.
7, 28 are formed. And these oxygen sensors 2
Numerals 5 and 26 are connected to a voltage detection unit of the NO X detection circuit, and oxygen pumps 27 and 28 are connected to a pump current control unit (neither is shown) of the NO X detection circuit.
【００１１】このＮＯX センサ１は、被測定ガスの雰囲
気中例えば、エンジンの排気ガス通路に配設され、室３
には他端から酸素濃度の基準となる大気が導入され、室
４、５内には孔２ｅ、２ｆを通して排気ガスが導入され
る。そして、室４内のＣｕ／ゼオライト触媒２０は、当
該室４内に導入された排気ガスに含有されるＮＯX を、
Ｎ2 とＯ2 とに分解し、酸素センサ２５は、電極１１と
１２とにより当該室４内の酸素濃度と大気が導入されて
いる室３の酸素濃度との差（酸素濃度差）により生じた
電位差を検出する。また、酸素ポンプ２７は、室４から
室外（排気ガス通路側）に酸素を汲み出して当該室４内
の酸素量を制御する。[0011] The NO X sensor 1, in an atmosphere of the measurement gas, for example, is disposed in an exhaust gas passage of the engine, the chamber 3
At the other end, an atmosphere serving as a reference for oxygen concentration is introduced, and exhaust gas is introduced into the chambers 4 and 5 through the holes 2e and 2f. Then, the Cu / zeolite catalyst 20 in the chamber 4 converts NO X contained in the exhaust gas introduced into the chamber 4 into NOx.
The oxygen sensor 25 is decomposed into N 2 and O 2, and the oxygen sensor 25 is caused by a difference (oxygen concentration difference) between the oxygen concentration in the chamber 4 and the oxygen concentration in the chamber 3 into which the atmosphere is introduced by the electrodes 11 and 12. The detected potential difference is detected. The oxygen pump 27 pumps oxygen from the chamber 4 to the outside (exhaust gas passage side) to control the amount of oxygen in the chamber 4.
【００１２】室５は、通常の酸素センサの構造を有し、
酸素センサ２６は、電極１３と１４とにより当該室５内
に導入された排気ガスに含有される酸素濃度と室３内の
大気中の酸素濃度との差（酸素濃度差）により生じた電
位差を検出する。また、酸素ポンプ２８は、酸素ポンイ
プ２７と同様に室５内の酸素を室外に汲み出して当該室
５内の酸素量を制御する。The chamber 5 has the structure of a normal oxygen sensor,
The oxygen sensor 26 detects a potential difference caused by a difference (oxygen concentration difference) between the concentration of oxygen contained in the exhaust gas introduced into the chamber 5 and the concentration of oxygen in the atmosphere in the chamber 3 by the electrodes 13 and 14. To detect. Further, the oxygen pump 28 controls the amount of oxygen in the chamber 5 by pumping oxygen in the chamber 5 to the outside like the oxygen pump 27.
【００１３】以下に作用を説明する。ＮＯX センサ１の
室４、５内には夫々孔２ｅ、２ｆから同一の排気ガスが
同量導入される。室５側の酸素センサ２６は、室３に導
入された大気中の酸素濃度と孔２ｆを通して室５内に導
入された排気ガス中の酸素濃度との濃度差に応じた電位
差Ｖ2 を発生する。そして、大気中の酸素濃度は、酸素
濃度の基準値とされる。前記ポンプ電流制御部は、前記
電位差Ｖ2 が常に設定値α（Ｖ）となるように酸素ポン
プ２８の電極１７、１８間に流す電流即ち、ポンプ電流
ＩP2を制御して室５内の酸素量を制御する。この室５内
の酸素は、側壁２ｃを通して室外に汲み出される。The operation will be described below. NO X sensor 1 of each hole 2e in the chamber 4,5, the same exhaust gas is introduced the same amount from 2f. The oxygen sensor 26 on the chamber 5 side generates a potential difference V 2 according to the difference between the oxygen concentration in the atmosphere introduced into the chamber 3 and the oxygen concentration in the exhaust gas introduced into the chamber 5 through the holes 2f. . The oxygen concentration in the atmosphere is set as a reference value of the oxygen concentration. The pump current control unit controls the current flowing between the electrodes 17 and 18 of the oxygen pump 28, that is, the pump current I P2 so that the potential difference V 2 always becomes the set value α (V), Control the amount. The oxygen in the chamber 5 is pumped out of the room through the side wall 2c.
【００１４】一方、室４側の酸素センサ２５は、室３に
導入された大気中の酸素濃度と室４内の酸素濃度との濃
度差に応じた電位差Ｖ1 を発生する。また、当該室４内
に導入された排気ガスに含有されるＮＯX は、Ｃｕ／ゼ
オライト触媒２０の作用によりＮ2 とＯ2 とに分解され
る。従って、室４内の酸素量は、導入された排気ガス中
の酸素と、前記ＮＯX の分解により発生した酸素とが存
在することとなり、当該室４内の酸素量は、室５内の酸
素量に比べて前記分解されて発生した酸素量だけ増加す
る。On the other hand, the oxygen sensor 25 on the chamber 4 side generates a potential difference V 1 according to the difference between the oxygen concentration in the atmosphere introduced into the chamber 3 and the oxygen concentration in the chamber 4. In addition, NO X contained in the exhaust gas introduced into the chamber 4 is decomposed into N 2 and O 2 by the action of the Cu / zeolite catalyst 20. Therefore, the oxygen content in the chamber 4, and the oxygen introduced in the exhaust gas, wherein becomes that the oxygen generated by the decomposition of the NO X present, oxygen content of the chamber 4, the oxygen in the chamber 5 It increases by the amount of oxygen generated by the decomposition compared to the amount.
【００１５】前記ポンプ電流制御部は、酸素センサ２５
により検出された前記電位差Ｖ1 が、室５側の酸素セン
サ２６により検出された電位差Ｖ2 と等しくなるように
電極１５、１６間に流すポンプ電流ＩP1を制御し、室４
内の酸素を側壁２ｃを通して室外に汲み出す。このとき
のポンプ電流ＩP1は、前記ポンプ電流ＩP2よりも大きい
値となる。従って、室４側の酸素ポンプ２７のポンプ電
流ＩP1と室５側の酸素ポンプ２８のポンプ電流ＩP2とを
比較し、その差ΔＩP （＝ＩP1−ＩP2）を演算すること
により排気ガス中のＮＯX 濃度（ｐｐｍ）を検出するこ
とができる。また、酸素ポンプ２７は、電極１５の表面
にＣｕ／ゼオライト触媒２０が担持されているために応
答性が向上し、排気ガス中のＮＯX 濃度の急激な変化に
対しても十分に追従することができる。The pump current control unit includes an oxygen sensor 25
The pump current I P1 flowing between the electrodes 15 and 16 is controlled so that the potential difference V 1 detected by the sensor 4 becomes equal to the potential difference V 2 detected by the oxygen sensor 26 on the chamber 5 side.
The oxygen inside is pumped outside through the side wall 2c. At this time, the pump current I P1 has a larger value than the pump current I P2 . Therefore, the pump current I P1 of the oxygen pump 27 on the chamber 4 side is compared with the pump current I P2 of the oxygen pump 28 on the chamber 5 side, and the difference ΔI P (= I P1 −I P2 ) is calculated. it is possible to detect the concentration of NO X in the gas (ppm). The oxygen pump 27, the Cu / zeolite catalyst 20 on the surface of the electrode 15 improves the responsiveness because it is supported also sufficiently follow the rapid change of the NO X concentration in the exhaust gas Can be.
【００１６】尚、本実施例においては、ＮＯX センサ１
の室４内に導入したＮＯX をＮ2 とＯ2 とに分解する触
媒として、Ｃｕ／ゼオライト触媒を使用した場合につい
て記述したが、これに限るものではなく、ＮＯX をＮ2
とＯ2 とに分解可能な触媒であれば他の触媒を使用して
もよく、また、当該触媒とＣｕ／ゼオライト触媒とを併
用してもよい。[0016] In the present embodiment, NO X sensor 1
Chamber 4 NO X introduced into the catalyst decomposed into N 2 and O 2, has been described for the case of using the Cu / zeolite catalyst is not limited to this, the NO X N 2
Other catalysts may be used as long as they can decompose into O 2 and O 2 , or the catalyst may be used in combination with a Cu / zeolite catalyst.
【００１７】[0017]
【発明の効果】以上説明したように本発明によれば、酸
素イオン伝導性固体電解質部材により大気を導入する第
１室と被測定ガスを導入する第２、第３室とを形成し、
第１室と第２及び第３室との隔壁を挟んで夫々電極を設
けて第１、第２の酸素センサを形成し、第２、第３室の
各側壁の内外面に夫々電極を設けてこれらの各室内の酸
素を室外に汲み出す第１、第２の酸素ポンプを形成し、
前記第２室と第３室とを酸素イオンの伝導を遮断する絶
縁部材により画成し、前記第２の酸素ポンプの第３室内
における電極に導入された被測定ガス中の窒素酸化物を
窒素と酸素とに分解する触媒を担持し、前記第１の酸素
センサの出力を設定値に保持すべく前記第１の酸素ポン
プを制御し、前記第２の酸素センサの出力を前記設定値
とすべく前記第２の酸素ポンプを制御し、これらの第１
及び第２の酸素ポンプの制御電流の差により前記窒素酸
化物の濃度を検出するようにしたので、前記被測定ガス
中に含有される窒素酸化物の濃度を簡単に、迅速且つ正
確に検出することが可能となり、窒素酸化物の濃度の急
激な変化に対しても追従し得る等の効果がある。As described above, according to the present invention, the first chamber for introducing the atmosphere and the second and third chambers for introducing the gas to be measured are formed by the oxygen ion conductive solid electrolyte member.
The first and second oxygen sensors are formed by providing electrodes respectively with the partition between the first chamber and the second and third chambers interposed therebetween, and the electrodes are provided on the inner and outer surfaces of each side wall of the second and third chambers respectively Forming first and second oxygen pumps for pumping oxygen in each of these chambers to the outside,
The second chamber and the third chamber are defined by an insulating member that blocks conduction of oxygen ions. And a catalyst that decomposes the oxygen into oxygen, controls the first oxygen pump to maintain the output of the first oxygen sensor at a set value, and sets the output of the second oxygen sensor to the set value The second oxygen pump is controlled to
And the concentration of the nitrogen oxide is detected by the difference between the control currents of the second oxygen pump and the second oxygen pump. This makes it possible to follow an abrupt change in the concentration of nitrogen oxides.
【図１】本発明に係るＮＯX センサの一実施例を示す要
部断面図である。FIG. 1 is a cross-sectional view of a principal part showing one embodiment of a NO X sensor according to the present invention.
１ ＮＯX センサ ２ 本体 ３ 大気導入室 ４、５ 被測定ガス導入室 １１〜１８ 電極 ２０ 触媒 ２３ ヒータ ２５、２６ 酸素センサ ２７、２８ 酸素ポンプ1 NO X sensor 2 body 3 air introducing chamber 4,5 measurement gas introduction chamber 11 to 18 electrode 20 catalyst 23 heaters 25 and 26 oxygen sensor 27 oxygen pump
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01N 27/416 G01N 27/419 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 7 , DB name) G01N 27/416 G01N 27/419
Claims (1)
大気を導入する第１室と被測定ガスを導入する第２、第
３室とを形成し、第１室と第２及び第３室との隔壁を挟
んで夫々電極を設けて第１、第２の酸素センサを形成
し、第２、第３室の各側壁の内外面に夫々電極を設けて
これらの各室内の酸素を室外に汲み出す第１、第２の酸
素ポンプを形成し、前記第２室と第３室とを酸素イオン
の伝導を遮断する絶縁部材により画成し、前記第２の酸
素ポンプの第３室内における電極に導入された被測定ガ
ス中の窒素酸化物を窒素と酸素とに分解する触媒を担持
し、前記第１の酸素センサの出力を設定値に保持すべく
前記第１の酸素ポンプを制御し、前記第２の酸素センサ
の出力を前記設定値とすべく前記第２の酸素ポンプを制
御し、これらの第１及び第２の酸素ポンプの制御電流の
差により前記窒素酸化物の濃度を検出することを特徴と
するＮＯX センサ。1. A first chamber for introducing air and second and third chambers for introducing a gas to be measured are formed by an oxygen ion conductive solid electrolyte member. The first and second oxygen sensors are formed by providing electrodes respectively with the partition wall interposed therebetween, and the electrodes are provided on the inner and outer surfaces of the side walls of the second and third chambers, respectively, and oxygen in each of these chambers is pumped out of the room. First and second oxygen pumps are formed, the second chamber and the third chamber are defined by an insulating member that blocks oxygen ion conduction, and are introduced to electrodes in the third chamber of the second oxygen pump. Carrying a catalyst for decomposing the nitrogen oxides in the measured gas into nitrogen and oxygen, controlling the first oxygen pump to maintain the output of the first oxygen sensor at a set value, The second oxygen pump is controlled so that the output of the second oxygen sensor becomes the set value. Beauty NO X sensor, characterized in that the difference of the control current of the second oxygen pump detects the concentration of the nitrogen oxides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03132885A JP3104291B2 (en) | 1991-06-04 | 1991-06-04 | NOX sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03132885A JP3104291B2 (en) | 1991-06-04 | 1991-06-04 | NOX sensor |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000181738A Division JP2001021535A (en) | 2000-01-01 | 2000-06-16 | NOx SENSOR |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04359144A JPH04359144A (en) | 1992-12-11 |
| JP3104291B2 true JP3104291B2 (en) | 2000-10-30 |
Family
ID=15091832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03132885A Expired - Fee Related JP3104291B2 (en) | 1991-06-04 | 1991-06-04 | NOX sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3104291B2 (en) |
Cited By (3)
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|---|---|---|---|---|
| DE102011016490A1 (en) * | 2011-04-08 | 2012-10-11 | Continental Automotive Gmbh | Sensor device for detecting a gas concentration and a particle concentration of an exhaust gas |
| KR101571388B1 (en) * | 2015-03-26 | 2015-11-24 | 미래화학 주식회사 | Pipe connection equipment without bolt |
| KR101945970B1 (en) | 2016-05-04 | 2019-02-11 | 칼 프로이덴베르크 카게 | Flange gasket, and gasket arrangement comprising a flange gasket of said type |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3050781B2 (en) * | 1995-10-20 | 2000-06-12 | 日本碍子株式会社 | Method and apparatus for measuring predetermined gas component in gas to be measured |
| JP3272215B2 (en) * | 1995-10-20 | 2002-04-08 | 日本碍子株式会社 | NOx sensor and NOx measuring method |
| US5948964A (en) * | 1995-10-20 | 1999-09-07 | Ngk Insulators, Ltd. | NOx sensor and method of measuring NOx |
| JPH1068346A (en) * | 1996-06-21 | 1998-03-10 | Ngk Insulators Ltd | Control method for engine exhaust gas system |
| JP3863974B2 (en) * | 1996-10-31 | 2006-12-27 | 株式会社日本自動車部品総合研究所 | Gas detector |
| US6068747A (en) * | 1997-03-10 | 2000-05-30 | Denso Corporation | Solid electrolyte gas sensor |
| EP1890139B1 (en) | 1998-02-20 | 2012-12-12 | NGK Spark Plug Co., Ltd. | NOx sensor system with control circuit unit |
| JP4698041B2 (en) * | 2001-02-28 | 2011-06-08 | 京セラ株式会社 | Air-fuel ratio sensor element |
| DE10156946A1 (en) * | 2001-11-20 | 2003-05-28 | Bosch Gmbh Robert | Sensor used for detecting soot particles in exhaust gas stream, comprises measuring electrodes arranged on substrate consisting of solid body electrolyte containing oxygen pump cells to which electrode pair is assigned |
| US6843900B2 (en) * | 2002-01-03 | 2005-01-18 | The Ohio State University | Potentiometric NOx sensors based on yttria-stabilized zirconia with zeolite modified electrode |
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1991
- 1991-06-04 JP JP03132885A patent/JP3104291B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011016490A1 (en) * | 2011-04-08 | 2012-10-11 | Continental Automotive Gmbh | Sensor device for detecting a gas concentration and a particle concentration of an exhaust gas |
| US9011659B2 (en) | 2011-04-08 | 2015-04-21 | Continental Automotive Gmbh | Sensor apparatus for detecting a gas concentration and a particle concentration of an exhaust gas |
| KR101571388B1 (en) * | 2015-03-26 | 2015-11-24 | 미래화학 주식회사 | Pipe connection equipment without bolt |
| KR101945970B1 (en) | 2016-05-04 | 2019-02-11 | 칼 프로이덴베르크 카게 | Flange gasket, and gasket arrangement comprising a flange gasket of said type |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04359144A (en) | 1992-12-11 |
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