JPH0752615Y2 - Device for mounting oxygen sensor for internal combustion engine - Google Patents
Device for mounting oxygen sensor for internal combustion engineInfo
- Publication number
- JPH0752615Y2 JPH0752615Y2 JP5907189U JP5907189U JPH0752615Y2 JP H0752615 Y2 JPH0752615 Y2 JP H0752615Y2 JP 5907189 U JP5907189 U JP 5907189U JP 5907189 U JP5907189 U JP 5907189U JP H0752615 Y2 JPH0752615 Y2 JP H0752615Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- exhaust gas
- oxygen sensor
- pipe
- sensor element
- 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
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- Measuring Oxygen Concentration In Cells (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【考案の詳細な説明】 〈産業上の利用分野〉 本考案は、排気中の酸素濃度を検出するために使用され
る内燃機関用酸素センサを排気管に取り付けるための取
付け装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a mounting device for mounting an oxygen sensor for an internal combustion engine used for detecting the oxygen concentration in exhaust gas to an exhaust pipe.
〈従来の技術〉 従来の内燃機関用酸素センサとして、例えば、第５図及
び第６図に示すようなものがある（特開昭63−262559号
公報等参照）。<Prior Art> Conventional oxygen sensors for internal combustion engines include, for example, those shown in FIGS. 5 and 6 (see Japanese Patent Laid-Open No. 63-262559).
即ち、例えばアルミナ等の絶縁基板5A上に、平面略コ字
状に形成された一端閉塞の大気導入孔5F形成用の例えば
固体電解質からなるシート5Bと、触媒としての作用を併
せ持つ白金製の内側電極5C及び外側電極5Dとを設けた酸
素イオン伝導性のジルコニア板5Eとを順次積層して構成
されるセンサ素子部５を、センサ素子部５の中間部から
基端部にかけて、ワッシャ6,タルク層７及びガラス層８
を介してホルダ９に保持する。ホルダ９の先端部には、
センサ素子部５を保護するためのプロテクタ10を取付け
てあり、該プロテクタ10には、排気導入用のスリット10
aが形成してある。11,12はそれぞれインナキャップとア
ウタキャップである。That is, for example, on an insulating substrate 5A made of alumina or the like, a sheet 5B made of, for example, a solid electrolyte for forming an air introduction hole 5F with one end closed in a substantially U-shaped plane, and a platinum inner side that also has a function as a catalyst A sensor element portion 5 constituted by sequentially laminating an oxygen ion conductive zirconia plate 5E provided with an electrode 5C and an outer electrode 5D is provided with a washer 6 and a talc from a middle portion to a base end portion of the sensor element portion 5. Layer 7 and glass layer 8
It is held in the holder 9 via. At the tip of the holder 9,
A protector 10 for protecting the sensor element portion 5 is attached, and the protector 10 has a slit 10 for introducing exhaust gas.
a is formed. 11 and 12 are an inner cap and an outer cap, respectively.
かかる構成の酸素センサ13は、第７図に示すようにホル
ダ９に螺合させたエキゾーストナット14を介して排気管
15壁部に固定して先端部を排気管内に臨ませて取付けら
れている。The oxygen sensor 13 having such a structure is provided with an exhaust pipe 14 through an exhaust nut 14 screwed to a holder 9 as shown in FIG.
15 It is attached to the wall with the tip facing the exhaust pipe.
これにより、排気管15内を第７図の矢印の方向から流れ
プロテクタ10内を通過する排気中の酸素濃度と大気導入
孔5Fに導入された大気中の酸素濃度との濃度差に応じて
内側電極5Cと外側電極5Dとの間に発生する超電力に基づ
き排気中の酸素濃度を検出し、機関に吸入される混合気
の空燃比を検出して空燃比フィードバック制御に用いて
いる。尚、排気温度が低い時の酸素センサの作動特性及
び応答性を向上させるために、絶縁基板5Aとシート5Bと
の間に図示しないが、絶縁シートで挟んだ加熱用ヒータ
を設けてセンサ素子部５を加熱し活性化できるようにな
っている。As a result, the inside of the exhaust pipe 15 flows in the direction of the arrow in FIG. 7 depending on the difference in concentration between the oxygen concentration in the exhaust passing through the protector 10 and the oxygen concentration in the atmosphere introduced into the atmosphere introduction hole 5F. The oxygen concentration in the exhaust gas is detected based on the super power generated between the electrode 5C and the outer electrode 5D, and the air-fuel ratio of the air-fuel mixture drawn into the engine is detected and used for air-fuel ratio feedback control. In order to improve the operating characteristics and responsiveness of the oxygen sensor when the exhaust temperature is low, although not shown between the insulating substrate 5A and the sheet 5B, a heating heater sandwiched between the insulating sheets is provided to provide the sensor element section. 5 can be heated and activated.
〈考案が解決しようとする課題〉 ところが、一般に酸素センサ13は排気管内の排気流に対
してその先端部が直角に取付けられているので、このよ
うな板状のセンサ素子の場合、電極部が片側にあるため
指向性を有し、また、プロテクタ10のスリット10aがセ
ンサ素子部５に対して略平行に設けられているので、第
８図に示すように排気流（矢印A,B,C方向）に対してセ
ンサ素子部５の電極部がどのような向きに取付けられて
いるかによって、センサ素子部５の電極面に対する排気
の当り方が異なる。このため、空燃比フィードバック制
御をしたときの排気成分、例えば窒素酸化物NOXの排出
量に第９図に示す如くバラツキが生じるという問題があ
った。<Problems to be Solved by the Invention> However, since the tip of the oxygen sensor 13 is generally attached at right angles to the exhaust flow in the exhaust pipe, in the case of such a plate-shaped sensor element, the electrode portion is Since it is on one side, it has directivity, and since the slit 10a of the protector 10 is provided substantially parallel to the sensor element portion 5, as shown in FIG. 8, the exhaust flow (arrows A, B, C The direction in which the exhaust gas hits the electrode surface of the sensor element portion 5 differs depending on the orientation of the electrode portion of the sensor element portion 5 with respect to the (direction). Therefore, there is a problem in that the exhaust amount of the exhaust component, for example, the nitrogen oxide NO x , when the air-fuel ratio feedback control is performed, varies as shown in FIG. 9.
本考案は上記の事情に鑑みなされたもので、排気流が板
状のセンサ素子部の側面からではなく先端側から当たる
ようにすることにより、取付け向きによらず酸素センサ
が一定の性能を発揮できるようにすることを目的とす
る。The present invention has been made in view of the above circumstances, and the exhaust gas impinges from the tip end side of the plate-shaped sensor element portion rather than the side surface thereof, so that the oxygen sensor exhibits a certain performance regardless of the mounting direction. The purpose is to be able to.
〈課題を解決するための手段〉 このため本考案では、排気中に臨ませた板状センサ素子
部により排気中の酸素濃度を検出する内燃機関用酸素セ
ンサを排気管に取付けるための取付け装置において、排
気管壁面に酸素センサを固定するエキゾーナットと、前
記センサ素子部周囲を覆うように前記エキゾーストナッ
トの排気管内側端面に固定される排気導入管とを備えて
構成され、前記排気導入管が、先端側に排気流に対して
対面する全面開口の排気導入部を有し、基端側近傍周壁
に、周方向に沿って複数の小孔を設けた排気排出部を有
する構成とした。<Means for Solving the Problems> Therefore, in the present invention, in a mounting device for mounting an oxygen sensor for an internal combustion engine, which detects an oxygen concentration in exhaust gas by a plate-shaped sensor element portion facing the exhaust gas, to an exhaust pipe. An exhaust nut for fixing an oxygen sensor to the exhaust pipe wall surface, and an exhaust introduction pipe fixed to the exhaust pipe inner end surface of the exhaust nut so as to cover the sensor element portion periphery, and the exhaust introduction pipe, An exhaust gas introduction portion having an entire opening facing the exhaust gas flow is provided on the tip end side, and an exhaust gas discharge portion having a plurality of small holes along the circumferential direction is provided on the peripheral wall near the base end side.
また、内燃機関用酸素センサの取付け装置を、排気管壁
面に酸素センサを固定するエキゾーナットと、前記セン
サ素子部周囲を覆うように前記エキゾーストナットの排
気管内側端面に固定される排気導入管とを備えて構成
し、前記排気導入管が、前記センサ素子部に沿ってスト
レートな円筒形状をなし、その先端面に開口部が先端外
方側に突出したスリットを放射状に複数設けてなる排気
導入部を有し、前記エキゾーストナットに固定される基
端側近傍周壁に、周方向に沿って複数の小孔を設けた排
気排出部を有する構成とした。Further, the mounting device of the oxygen sensor for an internal combustion engine, an exhaust nut for fixing the oxygen sensor to the exhaust pipe wall surface, and an exhaust introduction pipe fixed to the exhaust pipe inner end surface of the exhaust nut so as to cover the sensor element portion periphery. The exhaust gas introducing pipe has a straight cylindrical shape along the sensor element portion, and an exhaust gas introducing portion is provided with a plurality of slits radially provided with an opening projecting outward from the distal end surface thereof. The exhaust gas discharge portion is provided with a plurality of small holes along the circumferential direction on the peripheral wall near the base end side fixed to the exhaust nut.
〈作用〉 上記のように構成した酸素センサ取付け装置によれば、
排気は排気導入管先端部から流入し、センサ素子部の周
囲をその先端側から基端側に向かって流れ排気導入管の
基端側排気排出部から排出されるようになる。これによ
り、センサ素子部の電極面の向きによって排気の当り方
が異なることがなくなる。<Operation> According to the oxygen sensor mounting device configured as described above,
Exhaust gas flows in from the front end portion of the exhaust introduction pipe, flows around the sensor element portion from the front end side toward the proximal end side, and is exhausted from the proximal end side exhaust discharge portion of the exhaust gas introduction pipe. As a result, the way in which the exhaust gas strikes does not differ depending on the orientation of the electrode surface of the sensor element portion.
〈実施例〉 以下、本考案の実施例を図面に基づいて説明する。尚、
従来と同一要素には同一符号を付して説明を省略する。<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. still,
The same elements as those of the related art will be designated by the same reference numerals and description thereof will be omitted.
本考案の第１実施例を示す第１図において、本実施例の
取付け装置は、酸素センサ13を排気管15壁面に固定する
エキゾーストナット14の排気管内側端面に、酸素センサ
13のプロテクタ10周囲を覆うようにして排気導入管21を
固着して構成される。該排気導入管21は、略Ｌ状に折曲
形成され、その先端の全面開口した先端開口部22は、排
気流（図中矢印で示す）に対して対面して設けられ排気
導入部になっている。また、エキゾーストナット14に固
着される排気導入管21の基端側近傍周壁には、周方向に
沿って排気排出部として複数の排気排出孔23が設けられ
ている。Referring to FIG. 1 showing a first embodiment of the present invention, the mounting device of the present embodiment is such that the oxygen sensor 13 is fixed to the wall surface of the exhaust pipe 15, and the oxygen sensor is attached to the exhaust pipe inner end surface.
An exhaust gas introducing pipe 21 is fixedly attached so as to cover around the protector 10 of 13. The exhaust introduction pipe 21 is bent into a substantially L shape, and a front end opening 22 at the entire front end thereof is provided so as to face the exhaust flow (indicated by an arrow in the figure) and serves as an exhaust introduction portion. ing. Further, a plurality of exhaust gas discharge holes 23 are provided as exhaust gas discharge portions along the circumferential direction on the peripheral wall near the base end side of the exhaust gas introduction pipe 21 fixed to the exhaust nut 14.
かかる構造によれば、図の矢印方向から流れてくる排気
が、排気導入管21の先端開口部22から流入する。流入し
た排気は、図中矢印のように排気導入管21に沿ってプロ
テクタ10の先端側から基端側に向かって流れ、排気排出
孔23から排出される。そして、プロテクタ10の先端側か
ら基端側に流れながらプロテクタ10周囲から内部に流入
してセンサ素子部５に当たる。According to this structure, the exhaust gas flowing in the direction of the arrow in the drawing flows in from the front end opening portion 22 of the exhaust gas introduction pipe 21. The inflowing exhaust gas flows from the front end side to the base end side of the protector 10 along the exhaust gas introducing pipe 21 as indicated by an arrow in the figure, and is exhausted from the exhaust gas exhaust hole 23. Then, while flowing from the tip end side to the base end side of the protector 10, the protector 10 flows inward from around the protector 10 and hits the sensor element portion 5.
従って、センサ素子部５の電極面の向きに関係なく、排
気が略均等に電極部に当り電極部の指向性がなくなる。
これにより、空燃比フィードバック制御をしたときの排
気成分排出量のバラツキを無くすことができる。Therefore, regardless of the orientation of the electrode surface of the sensor element portion 5, the exhaust gas strikes the electrode portion substantially uniformly and the directivity of the electrode portion disappears.
As a result, it is possible to eliminate variations in the exhaust gas component emission amount when the air-fuel ratio feedback control is performed.
また、第２図に示すように、排気導入管31の先端開口部
32近傍の内壁に流入する排気に旋回流を与えるフィン34
を設けるようにすれば、電極面の指向性をなくせるのに
加えて、流入する排気が十分混合され、各気筒から排出
される排気中の酸素濃度のバラツキを解消でき、各気筒
の影響を除くことができる。尚、33は第１実施例と同様
に形成された排気排出孔である。In addition, as shown in FIG.
Fins 34 that give a swirl flow to the exhaust gas that flows into the inner wall near 32
In addition to eliminating the directivity of the electrode surface, the inflowing exhaust gas is sufficiently mixed, and the variation in the oxygen concentration in the exhaust gas discharged from each cylinder can be eliminated, and the influence of each cylinder can be eliminated. Can be excluded. Incidentally, 33 is an exhaust gas discharge hole formed in the same manner as in the first embodiment.
更に、第３図及び第４図に示すように、排気導入管41を
ストレートな円筒状として、先端部にその開口部が図に
示すように先端外方側に突出する形状の複数のスリット
42を放射状に設けて排気導入部を構成してもよい。尚、
排気排出部は、第１実施例と同様に排気導入管41基端側
近傍の側面に、周方向に沿って複数の排気排出孔43を設
けて構成してある。Further, as shown in FIGS. 3 and 4, the exhaust introduction pipe 41 is formed into a straight cylindrical shape, and a plurality of slits having a shape in which the opening portion at the tip portion protrudes outward from the tip end as shown in the figures.
42 may be provided radially to configure the exhaust gas introducing portion. still,
Similar to the first embodiment, the exhaust gas discharge portion is formed by providing a plurality of exhaust gas discharge holes 43 along the circumferential direction on the side surface near the base end side of the exhaust gas introduction pipe 41.
かかる構成によれば、第２実施例と同様にスリット42を
介して排気導入管41に流入した排気は旋回流になって、
プロテクタ10先端側から基端側に向かって流れ排気排出
孔43から排出されるので、排気が十分混合され各気筒の
影響を除くことができる。With this configuration, the exhaust gas that has flowed into the exhaust gas introduction pipe 41 through the slit 42 becomes a swirl flow as in the second embodiment.
Since the protector 10 flows from the front end side toward the base end side and is discharged from the exhaust gas discharge hole 43, the exhaust gas is sufficiently mixed and the influence of each cylinder can be eliminated.
尚、各実施例では、板状のジルコニア酸素センサに適用
した例を示したが、板状絶縁基板上に２つの電極を間隔
を設けて並設し、これら電極を多孔質のチタニア層で覆
う構成のチタニア酸素センサにも適用可能である。In each of the examples, an example of application to a plate-shaped zirconia oxygen sensor was shown, but two electrodes are arranged side by side on a plate-shaped insulating substrate and these electrodes are covered with a porous titania layer. It can also be applied to a titania oxygen sensor having a configuration.
〈考案の効果〉 以上説明したように本考案によれば、排気導入管の先端
開口部を排気流に対面させて排気を導入し、酸素センサ
のプロテクタ先端側から排気を当てるようにした排気導
入管を取付けるようにしたので、センサ素子電極間の排
気流に対する指向性を無くすことができ、酸素センサの
取付け向きによる特性のバラツキを無くして酸素センサ
が一定の酸素濃度検出性能を発揮することができる。<Effects of the Invention> As described above, according to the present invention, the exhaust gas is introduced by making the tip opening of the exhaust gas introduction pipe face the exhaust gas flow and introducing the exhaust gas from the protector tip side of the oxygen sensor. Since the pipe is attached, the directivity for the exhaust flow between the sensor element electrodes can be eliminated, and the oxygen sensor can exhibit a constant oxygen concentration detection performance by eliminating the variation in characteristics due to the mounting direction of the oxygen sensor. it can.
また、ストレートな円筒状の先端面に、開口部が先端外
方側に突出するようなスリットを放射状に複数設けて排
気を導入して酸素センサのプロテクタ先端側から排気を
当てるようにした排気導入管をエキゾーストナットに取
付けるようにしたので、センサ素子電極間の排気流に対
する指向性を無くしてセンサ取付け向きに関係なく一定
の酸素濃度検出性能を発揮することができる効果に加え
て、排気を旋回流として導入でき、各気筒から排出され
る排気の濃度のバラツキ解消により、各気筒間の影響を
除ける効果を有する。In addition, the straight cylindrical tip surface is provided with a plurality of radial slits such that the openings project outward from the tip, so that exhaust gas is introduced and the exhaust gas is introduced from the protector tip side of the oxygen sensor. Since the pipe is attached to the exhaust nut, in addition to the effect that the directivity for the exhaust flow between the sensor element electrodes can be eliminated and constant oxygen concentration detection performance can be exhibited regardless of the sensor installation direction, the exhaust gas can be swirled. It can be introduced as a flow, and by eliminating the variation in the concentration of the exhaust gas discharged from each cylinder, it has the effect of eliminating the influence between the cylinders.
第１図は本考案の第１実施例を示す酸素センサ取付け状
態図、第２図は本考案の第２実施例の断面図、第３図は
本考案の第３実施例を示す外観正面図、第４図は同上第
３実施例の排気導入管の先端側から見た図、第５図は本
考案が適用されるセンサ素子部の断面図、第６図は従来
の酸素センサの要部判断面図、第７図は従来の酸素セン
サ取付け状態図、第８図は酸素センサ電極部の向きと排
気流との関係を説明する図、第９図は同上従来例におけ
る電極面の向きと窒素酸化物排出量との関係を示すグラ
フである。 ５…センサ素子部、14…エキゾーストナット 21,31,41…排気導入管、22,23…先端開口部 23,33,43…排気排出孔、42…スリットFIG. 1 is an oxygen sensor mounting state diagram showing a first embodiment of the present invention, FIG. 2 is a sectional view of a second embodiment of the present invention, and FIG. 3 is an external front view showing a third embodiment of the present invention. FIG. 4 is a view seen from the tip side of the exhaust introduction pipe of the third embodiment, FIG. 5 is a sectional view of a sensor element part to which the present invention is applied, and FIG. 6 is a main part of a conventional oxygen sensor. FIG. 7 is a view showing the state of attachment of a conventional oxygen sensor, FIG. 8 is a view for explaining the relationship between the direction of the oxygen sensor electrode portion and the exhaust flow, and FIG. 9 is the same as the direction of the electrode surface in the conventional example. It is a graph which shows the relationship with a nitrogen oxide discharge amount. 5 ... Sensor element part, 14 ... Exhaust nut 21,31,41 ... Exhaust gas introduction pipe, 22,23 ... Tip opening 23,33,43 ... Exhaust gas exhaust hole, 42 ... Slit
Claims (2)
排気中の酸素濃度を検出する内燃機関用酸素センサを排
気管に取付けるための取付け装置において、 排気管壁面に酸素センサを固定するエキゾーナットと、
前記センサ素子部周囲を覆うように前記エキゾーストナ
ットの排気管内側端面に固定される排気導入管とを備え
て構成され、 前記排気導入管が、先端側に排気流に対して対面する全
面開口の排気導入部を有し、基端側近傍周壁に、周方向
に沿って複数の小孔を設けた排気排出部を有する構成で
ある内燃機関用酸素センサの取付け装置。1. A mounting device for mounting an oxygen sensor for an internal combustion engine, which detects an oxygen concentration in exhaust gas by means of a plate-shaped sensor element portion exposed to the exhaust gas, to an exhaust pipe, wherein the oxygen sensor is fixed to a wall surface of the exhaust pipe. Exhaust nut,
And an exhaust introduction pipe fixed to the exhaust pipe inner end surface of the exhaust nut so as to cover the periphery of the sensor element portion, wherein the exhaust introduction pipe has a front end side of an entire opening facing the exhaust flow. An oxygen sensor mounting device for an internal combustion engine, comprising an exhaust gas introduction portion, and an exhaust gas discharge portion having a plurality of small holes along the circumferential direction on a peripheral wall near the base end side.
排気中の酸素濃度を検出する内燃機関用酸素センサを排
気管に取付けるための取付け装置において、 排気管壁面に酸素センサを固定するエキゾーナットと、
前記センサ素子部周囲を覆うように前記エキゾーストナ
ットの排気管内側端面に固定される排気導入管とを備え
て構成され、 前記排気導入管が、前記センサ素子部に沿ってストレー
トな円筒形状をなし、その先端面に開口部が先端外方側
に突出したスリットを放射状に複数設けてなる排気導入
部を有し、前記エキゾーストナットに固定される基端側
近傍周壁に、周方向に沿って複数の小孔を設けた排気排
出部を有する構成である内燃機関用酸素センサの取付け
装置。2. A mounting device for mounting an oxygen sensor for an internal combustion engine, which detects an oxygen concentration in exhaust gas by means of a plate-shaped sensor element portion facing the exhaust gas, to an exhaust pipe, wherein the oxygen sensor is fixed to a wall surface of the exhaust pipe. Exhaust nut,
And an exhaust introduction pipe fixed to an exhaust pipe inner end surface of the exhaust nut so as to cover the periphery of the sensor element portion, wherein the exhaust introduction pipe has a straight cylindrical shape along the sensor element portion. A plurality of slits are provided on the tip end surface thereof, each of which has a plurality of slits radially outwardly projecting toward the tip tip end, and a plurality of slits are provided along the circumferential direction on a peripheral wall near the base end side fixed to the exhaust nut. A mounting device for an oxygen sensor for an internal combustion engine, which has a structure including an exhaust gas discharge portion provided with the small holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5907189U JPH0752615Y2 (en) | 1989-05-24 | 1989-05-24 | Device for mounting oxygen sensor for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5907189U JPH0752615Y2 (en) | 1989-05-24 | 1989-05-24 | Device for mounting oxygen sensor for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02149844U JPH02149844U (en) | 1990-12-21 |
| JPH0752615Y2 true JPH0752615Y2 (en) | 1995-11-29 |
Family
ID=31585249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5907189U Expired - Lifetime JPH0752615Y2 (en) | 1989-05-24 | 1989-05-24 | Device for mounting oxygen sensor for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0752615Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5408456B2 (en) * | 2011-03-31 | 2014-02-05 | トヨタ自動車株式会社 | Gas sensor |
| JP5641439B2 (en) * | 2011-08-29 | 2014-12-17 | 三菱自動車工業株式会社 | Gas sensor wet prevention device |
-
1989
- 1989-05-24 JP JP5907189U patent/JPH0752615Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02149844U (en) | 1990-12-21 |
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