JPH0552143A - Exhaust emission control device - Google Patents
Exhaust emission control deviceInfo
- Publication number
- JPH0552143A JPH0552143A JP20946091A JP20946091A JPH0552143A JP H0552143 A JPH0552143 A JP H0552143A JP 20946091 A JP20946091 A JP 20946091A JP 20946091 A JP20946091 A JP 20946091A JP H0552143 A JPH0552143 A JP H0552143A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen sensor
- oxygen
- way catalyst
- air
- fuel ratio
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、空燃比を調整する調整
装置と内燃機関の排気側に三元触媒を備えた排ガス浄化
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying device having an adjusting device for adjusting an air-fuel ratio and a three-way catalyst on the exhaust side of an internal combustion engine.
【０００２】[0002]
【従来の技術】本出願人は、空燃比を調整する調整装置
と、内燃機関の排気側に三元触媒とを備えた排ガス浄化
装置において、三元触媒の前流側と内燃機関の排気側と
の間に第１酸素センサを設け、三元触媒の後流側にメタ
ン不活性またはメタン低活性の第２酸素センサを設け、
第１酸素センサと第２酸素センサからの出力信号により
調整装置を制御する制御装置を設けた排ガス浄化装置を
先に提案した。2. Description of the Related Art The applicant of the present invention discloses an exhaust gas purifying apparatus having an adjusting device for adjusting an air-fuel ratio and a three-way catalyst on the exhaust side of an internal combustion engine. And a first oxygen sensor between the two, and a methane-inactive or low-methane second oxygen sensor behind the three-way catalyst,
The exhaust gas purifying apparatus provided with the control device for controlling the adjusting device based on the output signals from the first oxygen sensor and the second oxygen sensor was previously proposed.
【０００３】この排ガス浄化装置は、第２酸素センサに
よって三元触媒の最適浄化領域を検出し、第１酸素セン
サの空燃比の制御点をこの検出した最適浄化領域内に移
動させ、この移動した空燃比の制御点で制御装置が調整
装置を制御することにより、空燃比制御を行うものであ
る。This exhaust gas purifying apparatus detects the optimum purification region of the three-way catalyst by the second oxygen sensor, moves the control point of the air-fuel ratio of the first oxygen sensor to the detected optimum purification region, and moves it. The air-fuel ratio is controlled by the control device controlling the adjusting device at the air-fuel ratio control point.
【０００４】これにより、三元触媒の初期的なメタン活
性の低下による最適浄化領域の移動の際に、この移動と
共に、第１酸素センサの空燃比制御点が移動するため、
常に最適な空燃比制御を行うことができる。As a result, the air-fuel ratio control point of the first oxygen sensor moves with the movement of the optimum purification region due to the initial decrease in the methane activity of the three-way catalyst.
Optimal air-fuel ratio control can always be performed.
【０００５】上記空燃比制御方法において、三元触媒の
後流側に設けられる第２酸素センサは、三元触媒の最適
浄化流域、特にメタン活性が落ちた最適浄化流域と常に
一致させるために、この第２酸素センサの特性は、メタ
ン低活性もしくはメタン不活性の性能が必要である。In the above air-fuel ratio control method, the second oxygen sensor provided on the downstream side of the three-way catalyst always matches the optimum purification flow region of the three-way catalyst, especially the optimum purification flow region in which the methane activity has decreased. The characteristics of this second oxygen sensor require performance of methane low activity or methane inactivity.
【０００６】ところが、通常のジルコニア型酸素センサ
は、図５に示すように、約３００℃を超えると、メタン
の酸化活性が急激に増大する傾向がある。そのため、通
常、このジルコニア型酸素センサを、三元触媒の後流側
にある煙道に取り付けた場合には、この酸素センサの温
度は３００℃を超えて、メタン低活性の性能は得ること
はできなかった。However, as shown in FIG. 5, in a normal zirconia-type oxygen sensor, when it exceeds about 300 ° C., the oxidation activity of methane tends to rapidly increase. Therefore, normally, when this zirconia-type oxygen sensor is attached to the flue on the downstream side of the three-way catalyst, the temperature of the oxygen sensor exceeds 300 ° C, and low methane performance cannot be obtained. could not.
【０００７】[0007]
【発明の目的】そこで、本発明は、上記空燃比制御方法
において、ジルコニア型酸素センサでも、メタン低活性
もしくはメタン不活性の性能が必要とされる第２酸素セ
ンサとして使用できる排ガス浄化装置を提供するもので
ある。SUMMARY OF THE INVENTION Therefore, the present invention provides an exhaust gas purifying apparatus which can be used as a second oxygen sensor in the above-mentioned air-fuel ratio control method, even in the case of a zirconia type oxygen sensor which requires low methane activity or methane inactivity. To do.
【０００８】[0008]
【課題を解決するための手段】本発明の排ガス浄化装置
は、空燃比を調整する調整装置と内燃機関の排気側に三
元触媒を備え、三元触媒の前流側と内燃機関の排気側と
の間の前流側煙道に第１酸素センサを設け、三元触媒の
後流側の後流側煙道のジルコニア型第２酸素センサを設
け、第１酸素センサと第２酸素センサからの出力信号に
より調整装置を制御する制御装置とを設け、第２酸素セ
ンサによって三元触媒の最適浄化領域を検出し、第１酸
素センサの空燃比の制御点をこの検出した最適浄化領域
内に移動させ、この移動した空燃比の制御点で制御装置
が調整装置を制御することにより空燃比制御を行なう排
ガス浄化装置において、前記ジルコニア型第２酸素セン
サが、一端が閉塞した筒状の酸素検知素子と、酸素検知
素子の外周面に設けた外部電極と、酸素検知素子の内周
面に設けた内部電極と、前記各電極に接続されたリ−ド
線と、酸素検知素子を披嵌する筒状の支持部とこの支持
部と一体に設けられた冷却フィンとよりなる金属製のハ
ウジング部材と、第２酸素センサを後流側煙道に取付け
るためにハウジング部材の外周面に設けられた取付け部
材と、ハウジング部材の外周面と取付け部材との間に設
けられた断熱材とよりなるものである。An exhaust gas purifying apparatus of the present invention comprises an adjusting device for adjusting an air-fuel ratio and a three-way catalyst on the exhaust side of an internal combustion engine, and a front side of the three-way catalyst and an exhaust side of the internal combustion engine. Between the first oxygen sensor and the second oxygen sensor, the first oxygen sensor is provided in the flue on the upstream side between the and, and the zirconia-type second oxygen sensor is provided in the flue on the downstream side of the three-way catalyst. And a control device for controlling the adjusting device according to the output signal of 1., the second oxygen sensor detects the optimum purification region of the three-way catalyst, and the control point of the air-fuel ratio of the first oxygen sensor is within the detected optimum purification region. In the exhaust gas purifying device that moves the air-fuel ratio and the controller controls the adjusting device at the moved air-fuel ratio control point, the zirconia-type second oxygen sensor detects a cylindrical oxygen with one end blocked. Element and the outer peripheral surface of the oxygen sensing element. External electrodes, internal electrodes provided on the inner peripheral surface of the oxygen sensing element, lead wires connected to the electrodes, a cylindrical support portion for fitting the oxygen sensing element, and this support portion A metal housing member including a cooling fin provided in the housing, an attachment member provided on the outer peripheral surface of the housing member for attaching the second oxygen sensor to the flue side flue, and an outer peripheral surface of the housing member And a heat insulating material provided between the member and the member.
【０００９】[0009]
【作 用】上記構成の排ガス浄化装置におけるジルコニ
ア型第２酸素センサでは、酸素検知素子を被嵌している
筒状の支持部が、冷却フィンによって冷却され、これに
より酸素検知素子も低い温度となる。また、煙道とは、
断熱材を介して取付け部材によって取付けているため、
煙道の高い温度も伝わらないため、酸素検知素子の温度
が上がらない。したがって、排ガスの温度が高いにも拘
らず、ジルコニア型第２酸素センサの温度は３００℃よ
りも低い値となる。このため、メタン低活性の性能を得
ることができる。[Operation] In the zirconia-type second oxygen sensor in the exhaust gas purifying apparatus having the above-described configuration, the cylindrical support portion in which the oxygen detecting element is fitted is cooled by the cooling fins, and the oxygen detecting element also has a low temperature. Become. What is a flue?
Since it is mounted by the mounting member via the heat insulating material,
Since the high temperature of the flue is not transmitted, the temperature of the oxygen detection element does not rise. Therefore, although the temperature of the exhaust gas is high, the temperature of the zirconia-type second oxygen sensor becomes a value lower than 300 ° C. Therefore, the performance of low activity of methane can be obtained.
【００１０】[0010]
【実施例】以下、本発明の一実施例を図面に基づいて説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１１】図１は、本実施例の空燃比制御システム１
０のブロック図である。FIG. 1 is an air-fuel ratio control system 1 of this embodiment.
It is a block diagram of 0.
【００１２】符号１２は、燃料供給管である。この燃料
供給管１２から都市ガス１３Ａが供給され、空気供給管
１４から空気が供給される。Reference numeral 12 is a fuel supply pipe. City gas 13A is supplied from the fuel supply pipe 12, and air is supplied from the air supply pipe 14.
【００１３】符号１６はスロットルである。Reference numeral 16 is a throttle.
【００１４】符号１８はバイパス弁であって、このバイ
パス弁１８はモジュールモータにより動作する。Reference numeral 18 is a bypass valve, which is operated by a module motor.
【００１５】符号２０は、ガスエンジンである。Reference numeral 20 is a gas engine.
【００１６】符号２２は、ガスエンジンの排気側に設け
られた三元触媒である。Reference numeral 22 is a three-way catalyst provided on the exhaust side of the gas engine.
【００１７】符号２４は、ガスエンジン２０の排気側と
三元触媒の前流側との間に設けられた第１酸素センサで
ある。この第１酸素センサ２４はメタン活性の酸素セン
サである。Reference numeral 24 is a first oxygen sensor provided between the exhaust side of the gas engine 20 and the upstream side of the three-way catalyst. The first oxygen sensor 24 is a methane active oxygen sensor.
【００１８】符号２６は、三元触媒の後流側に設けられ
た酸素センサである。この第２酸素センサ２６はジルコ
ニア型のメタン低活性酸素センサである。Reference numeral 26 is an oxygen sensor provided on the downstream side of the three-way catalyst. The second oxygen sensor 26 is a zirconia-type methane low active oxygen sensor.
【００１９】符号２７は、第１酸素センサ及び第２酸素
センサ２６からの出力電圧に応じて、バイパス弁１８の
モジュールモータを動作させる制御装置である。Reference numeral 27 is a control device for operating the module motor of the bypass valve 18 in accordance with the output voltage from the first oxygen sensor and the second oxygen sensor 26.
【００２０】次に、図２に基づいて、ジルコニア型第２
酸素センサ２６の詳細な構造について説明する。Next, based on FIG. 2, the second zirconia type
The detailed structure of the oxygen sensor 26 will be described.
【００２１】符号２８は、ジルコニア型のセンサ素子で
ある。このジルコニア型センサ素子は、一端が閉塞され
た筒状であって、その外周面に外部電極３０が設けら
れ、その内周面に内部電極３２が設けられている。この
外部電極３２からリード線３４が接続されている。ま
た、内部電極３２にもリード線３６が接続されている。Reference numeral 28 is a zirconia type sensor element. This zirconia-type sensor element has a tubular shape with one end closed, an outer electrode 30 is provided on the outer peripheral surface thereof, and an inner electrode 32 is provided on the inner peripheral surface thereof. A lead wire 34 is connected from the external electrode 32. A lead wire 36 is also connected to the internal electrode 32.
【００２２】符号３８は、筒状のセンサ素子２８の内部
に設けられたヒータである。このヒータ３８は、セラミ
ックヒータよりなり、センサ素子２８を加熱するための
ものである。また、このヒータ３８に通電するために、
リード線４０，４２が設けられている。Reference numeral 38 is a heater provided inside the cylindrical sensor element 28. The heater 38 is made of a ceramic heater and is for heating the sensor element 28. Further, in order to energize the heater 38,
Lead wires 40 and 42 are provided.
【００２３】符号４４は、熱伝導性のよいステンレス製
または、ニッケル製のハウジング部材である。このハウ
ジング部材は筒状のセンサ素子２８を被嵌する一端が開
口した筒状の支持部と、この支持部４６と一体に設けら
れた冷却フィン４８とよりなる。Reference numeral 44 is a housing member made of stainless steel or nickel having good heat conductivity. The housing member is composed of a tubular support portion having one end opened into which the tubular sensor element 28 is fitted, and a cooling fin 48 provided integrally with the support portion 46.
【００２４】符号５０は、支持部４６の周面に設けられ
た、リード線３４，３６，４０，４２を導出するための
導出口である。Reference numeral 50 is a lead-out port provided on the peripheral surface of the support portion 46 for leading out the lead wires 34, 36, 40, 42.
【００２５】符号５２は、筒状の支持部４６の外周面に
設けられた取付け部材である。この取付け部材５２は、
三元触媒２２の後流側に設けられた煙道５４に取付ける
ための取付け具であって、その外周面に雄ネジが設けら
れており、煙道５４に螺合するようになっている。Reference numeral 52 is a mounting member provided on the outer peripheral surface of the cylindrical support portion 46. This mounting member 52 is
A fixture for attaching to a flue 54 provided on the downstream side of the three-way catalyst 22. A male screw is provided on the outer peripheral surface of the fixture to be screwed into the flue 54.
【００２６】符号５６は取付け部材５２と支持部４０と
の間に設けられた断熱部材である。この断熱部材は、例
えばセラミックや窒化ホウ素よりなり、煙道５４からの
熱を遮断する。Reference numeral 56 is a heat insulating member provided between the mounting member 52 and the support portion 40. The heat insulating member is made of ceramic or boron nitride, for example, and blocks heat from the flue 54.
【００２７】符号５８は、支持部４６の先端に設けられ
た、排ガスが通過するための複数個の孔である。この孔
５８から侵入した排ガスが、センサ素子２８に至る。Reference numeral 58 is a plurality of holes provided at the tip of the support portion 46 for allowing exhaust gas to pass therethrough. The exhaust gas that has entered through the holes 58 reaches the sensor element 28.
【００２８】上記構成の第２酸素センサ２６であると、
冷却フィン４８を設けることにより、センサ素子２８を
囲んでいる支持部４０が冷却され、センサ素子２８も低
い温度となる。また、煙道５４からの熱も、断熱部材５
６によって遮断されて、センサ素子２８に伝わることが
なく、その温度は低くなる。これにより、ジルコニア型
酸素センサであっても、この第２酸素センサ２６は、メ
タン低活性の性能を維持することができる。With the second oxygen sensor 26 having the above structure,
By providing the cooling fins 48, the support portion 40 surrounding the sensor element 28 is cooled, and the sensor element 28 also has a low temperature. In addition, the heat from the flue 54 also serves as the heat insulating member 5.
It is blocked by 6 and is not transmitted to the sensor element 28, and its temperature becomes low. As a result, even with the zirconia-type oxygen sensor, the second oxygen sensor 26 can maintain the performance of low methane activity.
【００２９】次に、上記構成の第２酸素センサ２６を使
用した場合の、センサ素子２８の温度と、煙道５４を通
る排ガス温度との関係を本出願人は実験した結果を図３
のグラフに示す。Next, when the second oxygen sensor 26 having the above-mentioned structure is used, the present applicant has conducted an experiment on the relationship between the temperature of the sensor element 28 and the temperature of the exhaust gas passing through the flue 54.
Is shown in the graph.
【００３０】これによると、冷却フィン４８のために、
排ガス温度が高いにも拘らず、センサ素子２８の温度
は、３００℃より低い値になっている。このため、この
第２酸素センサ２６は、排ガス温度が高い温度になって
も、センサ素子２８がメタンに感度のない領域にあると
いうことが証明された。According to this, because of the cooling fins 48,
Despite the high exhaust gas temperature, the temperature of the sensor element 28 is lower than 300 ° C. Therefore, it has been proved that the second oxygen sensor 26 has the sensor element 28 in a region insensitive to methane even when the exhaust gas temperature becomes high.
【００３１】次に、上記構成の空燃比制御システム１０
における動作状態を説明する。Next, the air-fuel ratio control system 10 having the above structure.
The operating state in FIG.
【００３２】図４のグラフは、メタン活性の低下した三
元触媒２２の排ガス中の各ガス濃度と、第１酸素センサ
２４及び第２酸素センサ２６の特性を示している。The graph of FIG. 4 shows the concentration of each gas in the exhaust gas of the three-way catalyst 22 with reduced methane activity and the characteristics of the first oxygen sensor 24 and the second oxygen sensor 26.
【００３３】上記構成の空燃比制御システム１０である
と、第２酸素センサ２６の急変点と三元触媒２２の最適
浄化領域とが、常に一致しているため、この第２酸素セ
ンサ２６の急変点を制御装置２８が検出する。In the air-fuel ratio control system 10 having the above-described structure, the sudden change point of the second oxygen sensor 26 and the optimum purification region of the three-way catalyst 22 always coincide with each other. The controller 28 detects the point.
【００３４】制御装置２８は、第１酸素センサ２４の空
燃比の制御点（制御電圧）を第２酸素センサ２６の急変
点に合せる。図４においては、制御電圧をＡ点からＢ点
に移動させる。これにより、三元触媒２２の劣化した状
態の最適浄化領域に合せることができる。The controller 28 adjusts the air-fuel ratio control point (control voltage) of the first oxygen sensor 24 to the sudden change point of the second oxygen sensor 26. In FIG. 4, the control voltage is moved from point A to point B. As a result, it is possible to match the optimum purification region where the three-way catalyst 22 is deteriorated.
【００３５】すなわち、第２酸素センサ２６を利用する
際には、第２酸素センサ２６の出力電圧がある一定値を
超えたか、もしくは超えないかで、リーン側かリッチ側
かを判断する。そして、第２酸素センサ２６を利用する
ことにより、測定した排ガスがリーン側かリッチ側かを
判断し、第１酸素センサ２４の空燃比の制御点を三元触
媒２２の最適浄化領域に追従さすことができる。That is, when the second oxygen sensor 26 is used, it is determined whether the output voltage of the second oxygen sensor 26 is lean or rich depending on whether or not it exceeds a certain value. Then, by using the second oxygen sensor 26, it is determined whether the measured exhaust gas is on the lean side or the rich side, and the control point of the air-fuel ratio of the first oxygen sensor 24 is made to follow the optimum purification region of the three-way catalyst 22. be able to.
【００３６】これにより、三元触媒の劣化状態に係わら
ず、長期的に安定な浄化性能を得ることができる。As a result, stable purification performance can be obtained for a long period of time regardless of the deterioration state of the three-way catalyst.
【００３７】特に、本発明の場合、第２酸素センサ２６
として、ジルコニア型酸素センサを使用し、冷却フィン
４８等を設けることにより、このセンサ素子２８の温度
を２５０℃以下に保っているため、メタン酸化活性が低
下している。したがって、ジルコニア型酸素センサであ
っても、メタン低活性の酸素センサとして使用すること
ができる。Particularly in the case of the present invention, the second oxygen sensor 26
As a zirconia-type oxygen sensor, the temperature of the sensor element 28 is kept at 250 ° C. or lower by using the cooling fin 48 and the like, so that the methane oxidation activity is lowered. Therefore, even a zirconia-type oxygen sensor can be used as an oxygen sensor with low methane activity.
【００３８】[0038]
【発明の効果】上記構成の排ガス浄化装置であると、第
２酸素センサにジルコニア型酸素センサを用いても、冷
却フィンや断熱材を設けることにより、酸素検知素子の
温度が、メタン低活性領域の温度内（３００℃）より低
い温度となっているため、メタン低活性酸素センサとし
て使用することができる。According to the exhaust gas purifying apparatus having the above-mentioned structure, even if a zirconia type oxygen sensor is used as the second oxygen sensor, the temperature of the oxygen detecting element is kept in the methane low active region by providing the cooling fin and the heat insulating material. Since the temperature is lower than the temperature (300 ° C.), it can be used as a methane low active oxygen sensor.
【００３９】このため、常に、第２酸素センサはメタン
活性の落ちた三元触媒の最適浄化領域を追従することが
できる。Therefore, the second oxygen sensor can always follow the optimum purification region of the three-way catalyst in which the methane activity has dropped.
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】本実施例の第２酸素センサの半縦断面図であ
る。FIG. 2 is a semi-longitudinal sectional view of a second oxygen sensor of this embodiment.
【図３】本実施例の第２酸素センサを使用した場合のセ
ンサ素子の温度と排ガスの温度の関係を示したグラフで
ある。FIG. 3 is a graph showing the relationship between the temperature of the sensor element and the temperature of exhaust gas when the second oxygen sensor of this example is used.
【図４】第１酸素センサ、第２酸素センサの出力電圧及
びガス濃度との関係を示したグラフである。FIG. 4 is a graph showing the relationship between the output voltage and gas concentration of the first oxygen sensor and the second oxygen sensor.
【図５】ジルコニア型酸素センサのメタン酸化活性の状
態を示すグラフである。FIG. 5 is a graph showing a state of methane oxidation activity of a zirconia-type oxygen sensor.
１０……空燃比制御システム １２……燃料供給管 １４……空気供給管 １６……スロットル １８……バイパス弁 ２０……ガスエンジン ２２……三元触媒 ２４……第１酸素センサ ２６……第２酸素センサ ２７……制御装置 ２８……センサ素子 ３０……外部電極 ３２……内部電極 ３４……リード線 ３６……リード線 ３８……ヒータ ４４……ハウジング部材 ４６……支持部 ４８……冷却フィン ５２……取付け部材 ５４……後流側煙道 ５６……断熱部材 10 ... Air-fuel ratio control system 12 ... Fuel supply pipe 14 ... Air supply pipe 16 ... Throttle 18 ... Bypass valve 20 ... Gas engine 22 ... Three-way catalyst 24 ... First oxygen sensor 26 ... 2 Oxygen sensor 27 ...... Control device 28 ...... Sensor element 30 ...... External electrode 32 ...... Internal electrode 34 ...... Lead wire 36 ...... Lead wire 38 ...... Heater 44 ...... Housing member 46 ...... Support portion 48 ...... Cooling fin 52 ... Mounting member 54 ... Wake-side flue 56 ... Insulation member
Claims (1)
気側に三元触媒を備え、 三元触媒の前流側と内燃機関の排気側との間の前流側煙
道に第１酸素センサを設け、 三元触媒の後流側の後流側煙道のジルコニア型第２酸素
センサを設け、 第１酸素センサと第２酸素センサからの出力信号により
調整装置を制御する制御装置とを設け、 第２酸素センサによって三元触媒の最適浄化領域を検出
し、 第１酸素センサの空燃比の制御点をこの検出した最適浄
化領域内に移動させ、 この移動した空燃比の制御点で制御装置が調整装置を制
御することにより空燃比制御を行なう排ガス浄化装置に
おいて、 前記ジルコニア型第２酸素センサが、 一端が閉塞した筒状の酸素検知素子と、 酸素検知素子の外周面に設けた外部電極と、 酸素検知素子の内周面に設けた内部電極と、 前記各電極に接続されたリ−ド線と、 酸素検知素子を披嵌する筒状の支持部とこの支持部と一
体に設けられた冷却フィンとよりなる金属製のハウジン
グ部材と、 第２酸素センサを後流側煙道に取付けるためにハウジン
グ部材の外周面に設けられた取付け部材と、 ハウジング部材の外周面と取付け部材との間に設けられ
た断熱材とよりなることを特徴とする排ガス浄化装置。1. An adjusting device for adjusting an air-fuel ratio and a three-way catalyst on an exhaust side of an internal combustion engine, wherein a first side flue between a front side of the three-way catalyst and an exhaust side of the internal combustion engine is provided. A controller for providing an oxygen sensor, a zirconia-type second oxygen sensor for a flue on the downstream side of the three-way catalyst, and a controller for controlling the adjusting device based on output signals from the first oxygen sensor and the second oxygen sensor; The optimum purification region of the three-way catalyst is detected by the second oxygen sensor, the control point of the air-fuel ratio of the first oxygen sensor is moved to the detected optimum purification region, and at the moved control point of the air-fuel ratio, In an exhaust gas purifying apparatus for controlling an air-fuel ratio by controlling an adjusting device by a control device, the zirconia-type second oxygen sensor is provided on a cylindrical oxygen detection element with one end closed and on an outer peripheral surface of the oxygen detection element. External electrode and inner surface of oxygen sensing element Made of metal, which includes an internal electrode provided on the substrate, a lead wire connected to each electrode, a cylindrical support portion for fitting the oxygen detection element, and a cooling fin integrally provided with the support portion. The housing member, the mounting member provided on the outer peripheral surface of the housing member for mounting the second oxygen sensor on the downstream side flue, and the heat insulating material provided between the outer peripheral surface of the housing member and the mounting member. An exhaust gas purifying device characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20946091A JP3013270B2 (en) | 1991-08-21 | 1991-08-21 | Exhaust gas purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20946091A JP3013270B2 (en) | 1991-08-21 | 1991-08-21 | Exhaust gas purification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0552143A true JPH0552143A (en) | 1993-03-02 |
| JP3013270B2 JP3013270B2 (en) | 2000-02-28 |
Family
ID=16573243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20946091A Expired - Fee Related JP3013270B2 (en) | 1991-08-21 | 1991-08-21 | Exhaust gas purification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3013270B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7805992B2 (en) * | 2007-03-27 | 2010-10-05 | Honeywell International Inc. | Gas sensor housing for use in high temperature gas environments |
| US20120160468A1 (en) * | 2009-07-20 | 2012-06-28 | Sinvent As | Local Thermal Management |
| GB2579334A (en) * | 2020-03-27 | 2020-06-17 | Cummins Emission Solutions Inc | Insulation assembly for reductant delivery system for exhaust gas aftertreatment system |
| US11002700B2 (en) | 2017-11-21 | 2021-05-11 | Honeywell International Inc. | High temperature gas sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017128153B4 (en) * | 2017-11-28 | 2023-08-17 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Sensor arrangement and method for providing the same |
-
1991
- 1991-08-21 JP JP20946091A patent/JP3013270B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7805992B2 (en) * | 2007-03-27 | 2010-10-05 | Honeywell International Inc. | Gas sensor housing for use in high temperature gas environments |
| US20120160468A1 (en) * | 2009-07-20 | 2012-06-28 | Sinvent As | Local Thermal Management |
| EP2457423A4 (en) * | 2009-07-20 | 2015-12-16 | Sinvent As | LOCAL THERMAL MANAGEMENT |
| US11002700B2 (en) | 2017-11-21 | 2021-05-11 | Honeywell International Inc. | High temperature gas sensor |
| GB2579334A (en) * | 2020-03-27 | 2020-06-17 | Cummins Emission Solutions Inc | Insulation assembly for reductant delivery system for exhaust gas aftertreatment system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3013270B2 (en) | 2000-02-28 |
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