JPH11344463A - Oxygen concentration sensor - Google Patents
Oxygen concentration sensorInfo
- Publication number
- JPH11344463A JPH11344463A JP10152395A JP15239598A JPH11344463A JP H11344463 A JPH11344463 A JP H11344463A JP 10152395 A JP10152395 A JP 10152395A JP 15239598 A JP15239598 A JP 15239598A JP H11344463 A JPH11344463 A JP H11344463A
- Authority
- JP
- Japan
- Prior art keywords
- protective cover
- gas
- oxygen concentration
- concentration sensor
- exhaust gas
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、酸素濃度センサに
関し、特に、酸素濃度センサの検出素子を保護する保護
カバーの構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen concentration sensor, and more particularly, to a structure of a protective cover for protecting a detection element of the oxygen concentration sensor.
【０００２】[0002]
【従来技術】排気ガスの酸素濃度を検出する酸素濃度セ
ンサにおいては、排気ガス中のカーボン等の異物が検出
素子に付着し検出精度が悪化するのを防止するために、
検出素子を覆うように保護カバーが配設されている。こ
の保護カバーには、排気ガスを検出素子へと導くために
その側面にガス導入口が設けられているが、このガス導
入口から異物が入り込むため、保護カバー側面のうち排
気ガスの流れに対し下流に位置する側面にガス導入孔を
設け、ガス導入口から異物が入り込むのを抑制したもの
が知られている（実開平２−１３５６４９号公報）。こ
の酸素濃度センサにあっては、排気ガスは保護カバーの
下流側より取り込まれ、検出素子に導かれる。そして、
保護カバーの下流側は排気ガスの圧力は低く、異物の密
度も低いため、異物の少ない排気ガスが検出素子へと導
かれる。2. Description of the Related Art In an oxygen concentration sensor for detecting the oxygen concentration of exhaust gas, in order to prevent foreign matter such as carbon in the exhaust gas from adhering to a detection element and deteriorating the detection accuracy,
A protection cover is provided so as to cover the detection element. This protective cover is provided with a gas inlet on its side to guide the exhaust gas to the detection element, but foreign matter enters through this gas inlet, so that the flow of exhaust gas on the side of the protective cover is restricted. It is known that a gas inlet hole is provided on a side surface located downstream to prevent foreign matter from entering through the gas inlet hole (Japanese Utility Model Laid-Open No. 2-135649). In this oxygen concentration sensor, exhaust gas is taken in from the downstream side of the protective cover and guided to the detection element. And
Since the pressure of the exhaust gas is low and the density of the foreign matter is low on the downstream side of the protective cover, the exhaust gas with little foreign matter is guided to the detection element.
【０００３】しかしながら、この酸素濃度センサにおい
ては、ガス導入孔から排気ガスを導入するとともにこの
ガス導入孔から排気ガスを排出しているため、保護カバ
ー内の排気ガスの交換が悪く、検出精度が低下するとい
う問題があり、そこで、本出願人は、保護カバー側面の
うち被検出ガスの流れに対し下流に位置する側面にガス
導入孔を設け、更に、保護カバー底面にガス排出孔を設
けた酸素濃度センサを先に提案した（特願平９−１９０
０３２）。この提案の酸素濃度センサよれば、ガス導入
孔から保護カバー内に流入した排気ガスは、保護カバー
底面に設けられたガス排出孔から排出され、このため、
保護カバー内の排気ガスの交換が良好になり、酸素濃度
センサの検出精度が向上する。[0003] However, in this oxygen concentration sensor, since the exhaust gas is introduced from the gas introduction hole and the exhaust gas is discharged from the gas introduction hole, the exchange of the exhaust gas in the protective cover is poor, and the detection accuracy is low. Therefore, the present applicant has provided a gas introduction hole on the side of the protective cover that is located downstream of the flow of the gas to be detected, and further provided a gas exhaust hole on the bottom of the protective cover. An oxygen concentration sensor was proposed earlier (Japanese Patent Application No. Hei 9-190).
032). According to the proposed oxygen concentration sensor, the exhaust gas flowing into the protection cover from the gas introduction hole is discharged from the gas discharge hole provided on the bottom surface of the protection cover.
The replacement of the exhaust gas in the protective cover is improved, and the detection accuracy of the oxygen concentration sensor is improved.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上記提案の
酸素濃度センサにおいては、保護カバー底面に設けられ
たガス排出孔近傍において、ガス流路内の圧力と保護カ
バー内の圧力との圧力差が小さいため、ガス排出孔から
排気ガスが排出されにくく、まだ、酸素濃度センサの検
出精度に改善の余地があった。In the oxygen concentration sensor proposed above, the pressure difference between the pressure in the gas flow path and the pressure in the protective cover near the gas exhaust hole provided on the bottom surface of the protective cover. Because of its small size, exhaust gas is hardly discharged from the gas discharge holes, and there is still room for improvement in the detection accuracy of the oxygen concentration sensor.
【０００５】また、保護カバーは円柱状に形成されてい
るため、保護カバーが排気ガスの流れの抵抗になり、保
護カバー周辺の圧力が増加する。このため、保護カバー
まわりの排気ガスの流れは、保護カバー上流側側面では
保護カバーの表面に沿う流線が、途中で保護カバーの表
面から剥がれ、流れの剥離が生じる。そして、保護カバ
ーの下流側には渦流が発生し、この渦流によって排気ガ
ス中の異物がガス導入孔より保護カバー内に流入してし
まう。これにより、検出素子に異物が付着してしまうと
いう問題があり、酸素濃度センサの検出精度に改善の余
地があった。[0005] Further, since the protective cover is formed in a columnar shape, the protective cover becomes a resistance to the flow of the exhaust gas, and the pressure around the protective cover increases. For this reason, in the flow of the exhaust gas around the protective cover, a streamline along the surface of the protective cover on the upstream side surface of the protective cover peels off from the surface of the protective cover on the way, and the flow is separated. Then, a vortex is generated on the downstream side of the protective cover, and foreign matter in the exhaust gas flows into the protective cover from the gas introduction hole due to the vortex. As a result, there is a problem that foreign matter adheres to the detection element, and there is room for improvement in detection accuracy of the oxygen concentration sensor.
【０００６】そこで、本発明は、保護カバー内の被検出
ガスの交換を良好にし、検出精度を向上させることがで
きる酸素濃度センサを提供することを第１の目的とし、
検出素子への異物の付着を抑制し、検出精度を向上させ
ることができる酸素濃度センサを提供することを第２の
目的とする。Accordingly, it is a first object of the present invention to provide an oxygen concentration sensor capable of improving the exchange of a gas to be detected in a protective cover and improving the detection accuracy.
It is a second object of the present invention to provide an oxygen concentration sensor capable of suppressing adhesion of foreign matter to a detection element and improving detection accuracy.
【０００７】[0007]
【課題を解決するための手段】請求項１に記載の発明で
は、上記第１の目的を達成するために、ガス流路内を流
れる被検出ガスの酸素濃度を検出する検出素子と、該検
出素子を覆うように配置される保護カバーとを備え、該
保護カバー側面のうち被検出ガスの流れに対し下流に位
置する側面にガス導入孔を設けるとともに、前記保護カ
バー底面にガス排出孔を設けた酸素濃度センサにおい
て、前記ガス排出孔より上流側の前記保護カバー底面に
前記ガス排出孔近傍の圧力を低下するベンチュリー壁を
形成したことを要旨としている。According to the first aspect of the present invention, to achieve the first object, a detecting element for detecting an oxygen concentration of a gas to be detected flowing in a gas flow path, A protective cover disposed so as to cover the element, a gas inlet hole is provided on a side surface of the protective cover side surface located downstream with respect to the flow of the gas to be detected, and a gas exhaust hole is provided on the bottom surface of the protective cover. In the oxygen concentration sensor, the gist is that a venturi wall for reducing the pressure near the gas exhaust hole is formed on the bottom surface of the protective cover upstream of the gas exhaust hole.
【０００８】上記請求項１に記載の発明によれば、ベン
チュリー壁によりガス排出孔近傍の圧力が下がり、ガス
排出孔近傍におけるガス流路内の圧力と保護カバー内の
圧力との圧力差が大きくなるため、ガス排出孔から被検
出ガスが排出され易く、ガス排出孔から排出されるガス
量およびガス導入孔から保護カバー内に流入するガス量
が多くなるため、保護カバー内のガスの交換が良好にな
る。According to the first aspect of the present invention, the pressure in the vicinity of the gas discharge hole is reduced by the venturi wall, and the pressure difference between the pressure in the gas passage near the gas discharge hole and the pressure in the protective cover is large. As a result, the gas to be detected is easily discharged from the gas discharge hole, and the amount of gas discharged from the gas discharge hole and the amount of gas flowing into the protective cover from the gas inlet hole are increased. Become good.
【０００９】また、請求項２に記載の発明では、上記第
２の目的を達成するために、ガス流路内を流れる被検出
ガスの酸素濃度を検出する検出素子と、該検出素子を覆
うように配置される保護カバーとを備え、該保護カバー
側面のうち被検出ガスの流れに対し下流に位置する側面
にガス導入孔を設けるとともに、前記保護カバー底面に
ガス排出孔を設けた酸素濃度センサにおいて、前記ガス
導入孔が設けられる前記保護カバー側面を流線形状に形
成したことを要旨としている。According to the second aspect of the present invention, in order to achieve the second object, a detecting element for detecting an oxygen concentration of a gas to be detected flowing in a gas flow path, and a cover for covering the detecting element. An oxygen concentration sensor comprising: a protective cover disposed on a side of the protective cover; a gas introduction hole provided on a side surface of the side surface of the protective cover located downstream with respect to the flow of the gas to be detected; and a gas exhaust hole provided on a bottom surface of the protective cover. Wherein the side surface of the protective cover provided with the gas introduction hole is formed in a streamline shape.
【００１０】上記請求項２に記載の発明によれば、保護
カバーの被検出ガスに対する抵抗が低下し、保護カバー
周辺の圧力増加が緩和される。したがって、保護カバー
まわりの被測定ガスの流れは、保護カバーの表面に沿う
流線が途中で保護カバーの表面から剥がれることはな
く、保護カバーの下流側に渦流が発生することを抑制で
きるため、被検出ガス中の異物がガス導入孔より保護カ
バー内に流入することを抑制できる。According to the second aspect of the invention, the resistance of the protective cover to the gas to be detected is reduced, and the pressure increase around the protective cover is reduced. Therefore, the flow of the gas to be measured around the protective cover does not cause the streamline along the surface of the protective cover to be separated from the surface of the protective cover on the way, and it is possible to suppress the generation of a vortex downstream of the protective cover, Foreign matter in the detected gas can be suppressed from flowing into the protective cover from the gas introduction hole.
【００１１】[0011]
【発明の実施の形態】以下、図１及び図２の図面を用い
て本発明における内燃機関の排気管に取り付けられた酸
素濃度センサの実施の形態について説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an oxygen concentration sensor attached to an exhaust pipe of an internal combustion engine according to the present invention will be described below with reference to FIGS.
【００１２】図１は、本実施の形態における酸素濃度セ
ンサの取付構造を示す図である。この図において、矢印
Ｑは、ガス流路としての排気管１０内を流れる被検出ガ
スとしての排気ガスの流れ方向を示すものである。ま
た、図２は、図１におけるＡ視の図である。FIG. 1 is a diagram showing a mounting structure of an oxygen concentration sensor according to the present embodiment. In this figure, the arrow Q indicates the flow direction of the exhaust gas as the gas to be detected flowing in the exhaust pipe 10 as the gas flow path. FIG. 2 is a diagram viewed from A in FIG.
【００１３】図１に示すように、酸素濃度センサ２０
は、基部２１、フランジ２２、センサ素子２３、センサ
素子支持部２４、保護カバー２５等から構成されてい
る。そして、センサ素子２３を覆うように配置された保
護カバー２５は、酸素濃度センサ２０が排気管１０に取
り付けられた状態において、図２に示すように、その側
面が円弧よりも排気ガスの流れの方向（矢印Ｑの方向）
に膨出する曲面とした流線形状に形成されるとともに、
センサ素子支持部２４からセンサ素子２３の先方まで延
びるよう形成され、排気ガスの流れの下流側に位置する
側面の一部は開口されてガス導入孔としての側方開口部
２８が形成されている。また、保護カバー２５には、セ
ンサ素子２３の先方において底面が形成され、その底面
の一部は開口されてガス排出孔としての先端開口部２７
が形成されている。As shown in FIG. 1, the oxygen concentration sensor 20
Is composed of a base 21, a flange 22, a sensor element 23, a sensor element support 24, a protective cover 25, and the like. When the oxygen concentration sensor 20 is attached to the exhaust pipe 10, the side surface of the protective cover 25 arranged to cover the sensor element 23 has a smaller flow rate than the arc, as shown in FIG. Direction (direction of arrow Q)
It is formed in a streamline shape with a curved surface that swells into
A side opening 28 is formed to extend from the sensor element support portion 24 to the front of the sensor element 23, and a part of a side surface located downstream of the flow of the exhaust gas is opened to form a side opening 28 as a gas introduction hole. . A bottom surface is formed in the protective cover 25 in front of the sensor element 23, and a part of the bottom surface is opened to form a tip opening 27 as a gas exhaust hole.
Are formed.
【００１４】更に、保護カバー２５の内側には、中間保
護カバー３０が設けられており、中間保護カバー３０に
は、その全周にわたってガス導入孔としての内側開口部
３１が複数形成されている。また、酸素濃度センサ２０
が排気管１０に取り付けられた状態において、先端開口
部２７上流側の保護カバー２５底面には底面からガス流
路内へと延出する壁２６が形成されており、壁２６は、
図２に示すように、先端開口部２７よりも径の大きな半
円筒状とされている。Further, an intermediate protective cover 30 is provided inside the protective cover 25, and the intermediate protective cover 30 is provided with a plurality of inner openings 31 as gas introduction holes all around the intermediate protective cover 30. In addition, the oxygen concentration sensor 20
Is attached to the exhaust pipe 10, a wall 26 extending from the bottom surface into the gas flow path is formed on the bottom surface of the protective cover 25 on the upstream side of the distal end opening 27.
As shown in FIG. 2, it has a semi-cylindrical shape having a larger diameter than the distal end opening 27.
【００１５】なお、酸素濃度センサ２０を排気管１０に
取り付けるに当っては、排気管１０に取り付けられたボ
ルト１１がフランジ２２の穴２９を通るように酸素濃度
センサ２０を配置する。この時、側方開口部２８が排気
ガスの流れの下流側に位置するように酸素濃度センサ２
０を配置し、その後、ナット１２で締め付けることで酸
素濃度センサ２０を排気管１０に取り付ける。When attaching the oxygen concentration sensor 20 to the exhaust pipe 10, the oxygen concentration sensor 20 is arranged so that the bolt 11 attached to the exhaust pipe 10 passes through the hole 29 of the flange 22. At this time, the oxygen concentration sensor 2 is set so that the side opening 28 is located on the downstream side of the exhaust gas flow.
The oxygen concentration sensor 20 is attached to the exhaust pipe 10 by arranging 0 and then tightening with the nut 12.
【００１６】次に、本実施の形態における酸素濃度セン
サの作用効果について説明する。図１の矢印Ｉに示すよ
うに、ガス流路内の排気ガスは、保護カバー２５の側方
開口部２８より保護カバー２５内に導入され、中間保護
カバー３０の内側開口部３１を介して、センサ素子２３
に導かれる。ここで、保護カバー２５下流側の圧力は低
く、排気ガス中の異物の密度が低いため、異物の少ない
排気ガスが保護カバー２５内に導入され、更に、側方開
口部２８より保護カバー２５内に導入された排気ガス中
の異物は中間保護カバー３０によって捕捉されるため、
排気ガス中の異物がセンサ素子２３に付着し酸素濃度セ
ンサ２０の検出精度が悪化するのが防止される。Next, the operation and effect of the oxygen concentration sensor according to this embodiment will be described. As shown by the arrow I in FIG. 1, the exhaust gas in the gas flow path is introduced into the protective cover 25 through the side opening 28 of the protective cover 25, and is passed through the inner opening 31 of the intermediate protective cover 30. Sensor element 23
It is led to. Here, since the pressure on the downstream side of the protective cover 25 is low and the density of foreign matter in the exhaust gas is low, exhaust gas with less foreign matter is introduced into the protective cover 25, and furthermore, the protective cover 25 is opened through the side opening 28. Since the foreign matter in the exhaust gas introduced into the airbag is caught by the intermediate protective cover 30,
Foreign matter in the exhaust gas is prevented from adhering to the sensor element 23 and the detection accuracy of the oxygen concentration sensor 20 is prevented from deteriorating.
【００１７】また、保護カバー２５内の排気ガスは、保
護カバー２５底面の先端開口部２７より排出される。こ
こで、保護カバー２５底面近傍の排気ガスの流れは、保
護カバー２５底面の先端開口部２７上流側に形成された
壁２６により、図１の矢印Ｏに示すように流れ、また、
先端開口部２７近傍では図２の矢印ｒのように流れる。
このベンチュリー壁としての壁２６により、先端開口部
２７近傍における流速は速くなり、先端開口部２７近傍
におけるガス流路内の圧力が低下し、保護カバー２５内
の圧力との圧力差が大きくなる。これにより、先端開口
部２７におけるベンチュリ効果が大きくなり、先端開口
部２７から排気ガスが排出され易くなって、先端開口部
２７から排出されるガス量および側方開口部２８から保
護カバー２５内に流入するガス量が多くなるため、保護
カバー２５内の排気ガスの交換が良好になる。Exhaust gas in the protective cover 25 is exhausted from an opening 27 at the bottom of the protective cover 25. Here, the flow of the exhaust gas near the bottom surface of the protective cover 25 flows as shown by an arrow O in FIG. 1 by a wall 26 formed on the upstream side of a tip opening 27 on the bottom surface of the protective cover 25.
In the vicinity of the distal end opening 27, the flow flows as indicated by an arrow r in FIG.
Due to the wall 26 as the venturi wall, the flow velocity in the vicinity of the distal end opening 27 is increased, the pressure in the gas passage near the distal end opening 27 is reduced, and the pressure difference from the pressure in the protective cover 25 is increased. As a result, the venturi effect at the distal end opening 27 increases, and the exhaust gas is easily discharged from the distal end opening 27, and the amount of gas discharged from the distal opening 27 and the side opening 28 into the protective cover 25. Since the amount of gas flowing in increases, the exchange of the exhaust gas in the protective cover 25 is improved.
【００１８】更に、保護カバー２５側面は、流線形状に
形成されているため、保護カバー２５周辺の圧力増加が
緩和される。したがって、保護カバー２５まわりの排気
ガスの流れは、図２の矢印Ｒに示すように、保護カバー
２５の表面に沿う流線が保護カバー２５から剥離するこ
とはなく、保護カバー２５下流に渦流が発生することを
抑制できるため、排気ガス中の異物が側方開口部２８よ
り保護カバー２５内に流入することを抑制でき、排気ガ
ス中の異物がセンサ素子２３に付着し酸素濃度センサ２
０の検出精度が悪化するのが確実に防止される。Further, since the side surface of the protective cover 25 is formed in a streamline shape, an increase in pressure around the protective cover 25 is reduced. Therefore, the flow of the exhaust gas around the protective cover 25 does not cause the streamline along the surface of the protective cover 25 to separate from the protective cover 25 as shown by the arrow R in FIG. Since the generation can be suppressed, the foreign matter in the exhaust gas can be suppressed from flowing into the protective cover 25 through the side opening 28, and the foreign matter in the exhaust gas adheres to the sensor element 23 and the oxygen concentration sensor 2
Deterioration of the detection accuracy of 0 is reliably prevented.
【００１９】なお、本発明は、上記実施の形態に限られ
るものではなく、上記実施の形態では保護カバー２５に
中間保護カバー３０を設けたが、これをなくした構成と
しても良く、また、内燃機関の排気管に取り付けられた
酸素濃度センサについて示したが、例えば、排気ガスを
吸気管内に再循環させる排気ガス再循環通路を備えた内
燃機関の排気ガス再循環通路に取り付けられた、或い
は、吸気管に取り付けられた酸素濃度センサにも適用で
きることは言うまでもない。The present invention is not limited to the above embodiment. In the above embodiment, the protective cover 25 is provided with the intermediate protective cover 30, but the intermediate cover 30 may be omitted. Although the oxygen concentration sensor attached to the exhaust pipe of the engine has been shown, for example, attached to the exhaust gas recirculation path of an internal combustion engine having an exhaust gas recirculation path for recirculating exhaust gas into the intake pipe, or It goes without saying that the present invention can also be applied to an oxygen concentration sensor attached to the intake pipe.
【００２０】[0020]
【発明の効果】以上詳述したように、請求項１に記載の
発明によれば、ベンチュリー壁により、ガス排出孔から
排出されるガス量およびガス導入孔から保護カバー内に
流入するガス量が多くなり、保護カバー内のガスの交換
が良好になるため、酸素濃度センサの検出精度が向上す
る。As described in detail above, according to the first aspect of the present invention, the amount of gas discharged from the gas exhaust hole and the amount of gas flowing into the protective cover from the gas inlet hole are determined by the venturi wall. This increases the exchange of gas in the protective cover, thereby improving the detection accuracy of the oxygen concentration sensor.
【００２１】また、請求項２に記載の発明によれば、保
護カバーの下流側に渦流が発生することを抑制でき、被
検出ガス中の異物がガス導入孔より保護カバー内に流入
することを抑制できるため、酸素濃度センサの検出精度
が向上する。According to the second aspect of the present invention, it is possible to suppress the generation of a vortex downstream of the protective cover, and to prevent foreign substances in the detected gas from flowing into the protective cover from the gas introduction holes. Since it can be suppressed, the detection accuracy of the oxygen concentration sensor is improved.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本実施の形態における酸素濃度センサの取付構
造を示す図。FIG. 1 is a diagram showing a mounting structure of an oxygen concentration sensor according to an embodiment.
【図２】図１におけるＡ視の図である。FIG. 2 is a diagram viewed from A in FIG.
１０…排気管、１１…ボルト、１２…ナット、２０…酸
素濃度センサ、２１…基部、２２…フランジ、２３…セ
ンサ素子（検出素子）、２４…センサ素子支持部、２５
…保護カバー、２６…壁、２７…先端開口部（ガス排出
孔）、２８…側方開口部（ガス導入孔）、２９…穴、３
０…中間保護カバー、３１…内側開口部Reference Signs List 10 exhaust pipe, 11 bolt, 12 nut, 20 oxygen concentration sensor, 21 base, 22 flange, 23 sensor element (detection element), 24 sensor element support, 25
... Protective cover, 26 ... Wall, 27 ... Tip opening (gas discharge hole), 28 ... Side opening (gas introduction hole), 29 ... Hole, 3
0: Intermediate protective cover, 31: Inside opening
Claims (2)
度を検出する検出素子と、該検出素子を覆うように配置
される保護カバーとを備え、該保護カバー側面のうち被
検出ガスの流れに対し下流に位置する側面にガス導入孔
を設けるとともに、前記保護カバー底面にガス排出孔を
設けた酸素濃度センサにおいて、 前記ガス排出孔より上流側の前記保護カバー底面に前記
ガス排出孔近傍の圧力を低下するベンチュリー壁を形成
したことを特徴とする酸素濃度センサ。1. A detection element for detecting an oxygen concentration of a gas to be detected flowing in a gas flow path, and a protection cover disposed so as to cover the detection element. In an oxygen concentration sensor having a gas introduction hole provided on a side surface located downstream with respect to the flow and a gas exhaust hole provided on the bottom surface of the protective cover, the gas exhaust hole is provided on the bottom surface of the protective cover upstream of the gas exhaust hole. An oxygen concentration sensor characterized by forming a Venturi wall for reducing the pressure of the oxygen.
度を検出する検出素子と、該検出素子を覆うように配置
される保護カバーとを備え、該保護カバー側面のうち被
検出ガスの流れに対し下流に位置する側面にガス導入孔
を設けるとともに、前記保護カバー底面にガス排出孔を
設けた酸素濃度センサにおいて、 前記ガス導入孔が設けられる前記保護カバー側面を流線
形状に形成したことを特徴とする酸素濃度センサ。2. A detecting element for detecting an oxygen concentration of a gas to be detected flowing in a gas flow path, and a protective cover disposed so as to cover the detecting element. In an oxygen concentration sensor having a gas introduction hole provided on a side surface located downstream with respect to the flow and a gas exhaust hole provided on the bottom surface of the protection cover, the protection cover side surface provided with the gas introduction hole is formed in a streamline shape. An oxygen concentration sensor, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10152395A JPH11344463A (en) | 1998-06-02 | 1998-06-02 | Oxygen concentration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10152395A JPH11344463A (en) | 1998-06-02 | 1998-06-02 | Oxygen concentration sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11344463A true JPH11344463A (en) | 1999-12-14 |
Family
ID=15539587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10152395A Pending JPH11344463A (en) | 1998-06-02 | 1998-06-02 | Oxygen concentration sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11344463A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009250682A (en) * | 2008-04-02 | 2009-10-29 | Ngk Spark Plug Co Ltd | Gas sensor |
| JP2016109668A (en) * | 2014-11-26 | 2016-06-20 | 株式会社デンソー | Gas sensor attachment structure |
| WO2020241721A1 (en) * | 2019-05-29 | 2020-12-03 | 三菱ふそうトラック・バス株式会社 | Gas sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6288956U (en) * | 1985-11-26 | 1987-06-06 | ||
| JPS62186047U (en) * | 1986-05-20 | 1987-11-26 | ||
| JPH02135649U (en) * | 1989-04-12 | 1990-11-13 | ||
| JPH09281072A (en) * | 1996-12-25 | 1997-10-31 | Hitachi Ltd | Oxygen concentration detector |
-
1998
- 1998-06-02 JP JP10152395A patent/JPH11344463A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6288956U (en) * | 1985-11-26 | 1987-06-06 | ||
| JPS62186047U (en) * | 1986-05-20 | 1987-11-26 | ||
| JPH02135649U (en) * | 1989-04-12 | 1990-11-13 | ||
| JPH09281072A (en) * | 1996-12-25 | 1997-10-31 | Hitachi Ltd | Oxygen concentration detector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009250682A (en) * | 2008-04-02 | 2009-10-29 | Ngk Spark Plug Co Ltd | Gas sensor |
| JP2016109668A (en) * | 2014-11-26 | 2016-06-20 | 株式会社デンソー | Gas sensor attachment structure |
| WO2020241721A1 (en) * | 2019-05-29 | 2020-12-03 | 三菱ふそうトラック・バス株式会社 | Gas sensor |
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