JPS6280552A - Oxygen sensor for internal-combustion engine - Google Patents
Oxygen sensor for internal-combustion engineInfo
- Publication number
- JPS6280552A JPS6280552A JP60219213A JP21921385A JPS6280552A JP S6280552 A JPS6280552 A JP S6280552A JP 60219213 A JP60219213 A JP 60219213A JP 21921385 A JP21921385 A JP 21921385A JP S6280552 A JPS6280552 A JP S6280552A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- solid electrolyte
- spacer
- substrate
- oxygen concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4071—Cells and probes with solid electrolytes for investigating or analysing gases using sensor elements of laminated structure
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野〉
本発明は、酸素センサに関し、特に内燃機関の排気管に
装着して該機関に供給される混合気の空燃比と密接な関
係にある排気中の酸素濃度を測定し、空燃比フィードバ
ック制御におけるフィードバック信号の提供などに用い
るものに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an oxygen sensor, and particularly relates to an oxygen sensor that is attached to an exhaust pipe of an internal combustion engine to detect the exhaust gas, which is closely related to the air-fuel ratio of the mixture supplied to the engine. This device measures the oxygen concentration in air and is used for providing feedback signals in air-fuel ratio feedback control.
〈従来の技術〉
従来、この種の酸素センサとして、酸素濃度の高い領域
（空燃比リーン領域）から低い領域（空燃比リッチ領域
）まで広範囲に測定できるものが、例えばＳＡＥ ｐａ
ｐｅｒ ８５０３７８において示されである。<Conventional Technology> Conventionally, as this type of oxygen sensor, one that can measure a wide range of oxygen concentration from a high oxygen concentration region (air-fuel ratio lean region) to a low oxygen concentration region (air-fuel ratio rich region) has been used, for example, SAE pa
per 850378.
かかる酸素センサとしては例えば第３図に示すようなも
のがある（特願昭６０−１６７４４０号参照）。An example of such an oxygen sensor is the one shown in FIG. 3 (see Japanese Patent Application No. 60-167440).
図において、酸素センサは、例えば白金で構成された加
熱ヒータ４１を埋設したアルミナ等からなる基板４２上
に、一対の白金からなる測定電極４３゜４４を並設し、
これら測定電極４３．４４上に酸素濃度に応じて抵抗値
が変化するチタニア或いは酸化コバルト等の酸化物半導
体４５を印刷して形成される酸素濃度検出部４６を有す
る。また、ジルコニア等からなる酸素イオン伝導性の固
体電解質４７の両面に一対の白金からなるポンプ電極４
８．４９を設けて形成される酸素ポンプ部５０を有して
いる。In the figure, the oxygen sensor includes a pair of measurement electrodes 43 and 44 made of platinum arranged side by side on a substrate 42 made of alumina or the like in which a heater 41 made of platinum is embedded, for example.
An oxygen concentration detection section 46 is formed by printing an oxide semiconductor 45 such as titania or cobalt oxide whose resistance value changes depending on the oxygen concentration on these measurement electrodes 43 and 44. Furthermore, a pair of pump electrodes 4 made of platinum are provided on both sides of an oxygen ion conductive solid electrolyte 47 made of zirconia or the like.
It has an oxygen pump section 50 formed by providing 8.49.
そして、該酸素ポンプ部５０を、熱伝導性の良好な例え
ばアルミナで枠状に形成したスペーサ５１を介して酸素
濃度検出部４６の上方に積層して、酸素濃度検出部４６
と酸素ポンプ部５０との間に密閉された間隙部５２が設
けられ、かつ、この間隙部５２に機関排気を導入するた
めの導入孔５３が酸素ポンプ部５０の固体電解質４７に
形成されている。尚、前記スペーサ５１の外周にはガラ
ス製の接着剤５５が充填され、間隙部５２の密閉性を確
保すると共に、基板４２及びスペーサ５１と固体電解質
４７とを接着固定するようにしである。ここで、スペー
サ５１と基板４２とは同時焼成して結合されるため、間
隙部５２の密閉性はスペーサ５１と固体電解質４７とを
接着することによって確保されるものである。Then, the oxygen pump section 50 is stacked above the oxygen concentration detection section 46 via a spacer 51 formed into a frame shape of, for example, alumina having good thermal conductivity.
A sealed gap portion 52 is provided between the oxygen pump portion 50 and the oxygen pump portion 50, and an introduction hole 53 for introducing engine exhaust gas into the gap portion 52 is formed in the solid electrolyte 47 of the oxygen pump portion 50. . The outer periphery of the spacer 51 is filled with a glass adhesive 55 to ensure sealing of the gap 52 and to adhesively fix the solid electrolyte 47 to the substrate 42 and the spacer 51. Here, since the spacer 51 and the substrate 42 are bonded by simultaneous firing, the airtightness of the gap 52 is ensured by adhering the spacer 51 and the solid electrolyte 47.
かかる構成によれば、間隙部５２内の酸素量の変化に応
じて酸化物半導体４５の抵抗値が変化することから、こ
の抵抗値変化に基づいて間隙部５２内の雰囲気を検出し
、この検出結果に応じて間隙部５２内の雰囲気を一定（
例えば理論空燃比）に保つように酸素ポンプ部５０に流
す電流量を制御し、その時の電流量から排気中の酸素濃
度が検出できる。According to this configuration, since the resistance value of the oxide semiconductor 45 changes according to a change in the amount of oxygen in the gap 52, the atmosphere in the gap 52 is detected based on this change in resistance value, and the atmosphere in the gap 52 is detected. Depending on the result, the atmosphere in the gap 52 is kept constant (
For example, the amount of current flowing through the oxygen pump section 50 is controlled to maintain the stoichiometric air-fuel ratio), and the oxygen concentration in the exhaust gas can be detected from the amount of current at that time.
例えば、排気中の酸素４度の高いリーン領域での空燃比
を検出する場合には、外側のポンプ電極４８を陽極、間
隙部５２側のポンプ電極４９を陰極にして電圧を印加す
る。すると、電流に比例した酸素（酸素イオン０２−）
が間隙部５２内から外側に汲み出される。そして、印加
電圧が所定値以上になると、流れる電流は限界値に達し
、この限界電流値を測定することにより排気中の酸素濃
度、言い換えれば空燃比を検出できる。逆に、ポンプ電
極４８を陰極、ポンプ電極４９を陽極にして間隙部５２
内に酸素を汲み入れるようにすれば、排気中の酸素濃度
の低い空燃比リッチ領域での検出ができる。For example, when detecting the air-fuel ratio in a lean region where oxygen in the exhaust gas is high at 4 degrees Celsius, a voltage is applied using the outer pump electrode 48 as an anode and the pump electrode 49 on the gap 52 side as a cathode. Then, oxygen (oxygen ion 02-) proportional to the current
is pumped out from within the gap 52. Then, when the applied voltage exceeds a predetermined value, the flowing current reaches a limit value, and by measuring this limit current value, the oxygen concentration in the exhaust gas, in other words, the air-fuel ratio can be detected. Conversely, the pump electrode 48 is used as a cathode and the pump electrode 49 is used as an anode to form the gap 52.
By pumping oxygen into the exhaust gas, detection can be performed in the air-fuel ratio rich region where the oxygen concentration in the exhaust gas is low.
このようにして、上記内燃機関用酸素センサは、広範囲
な酸素濃度領域で測定することができ、広域空燃比セン
サーとも呼ばれるものである。In this way, the oxygen sensor for internal combustion engines can measure oxygen concentration in a wide range of regions, and is also called a wide range air-fuel ratio sensor.
〈発明が解決しようとする問題点）
ところで、かかる内燃機関用酸素センサにおいては、間
隙部５２を形成するスペーサ５１の外周面と固体電解質
４７及び基板４２とによって囲まれるコの字状の間隙に
前記のようにガラス製の接着剤５５を充填して、間隙部
５２の密閉性を確保すると共に、固体電解質４７と基板
４２とを接着固定していた。(Problems to be Solved by the Invention) In this internal combustion engine oxygen sensor, a U-shaped gap surrounded by the outer peripheral surface of the spacer 51 forming the gap 52, the solid electrolyte 47, and the substrate 42 is As described above, the glass adhesive 55 was filled to ensure the airtightness of the gap 52 and to adhesively fix the solid electrolyte 47 and the substrate 42.
このため、固体電解質４７と基板４２との熱膨張率差に
より温度サイクルで接着剤５５．固体電解質４７及び基
板４２にひび割れが発生することがあり、これにより酸
素イオンの伝導性が変化したり間隙部の密閉性が損なわ
れて、酸素濃度検出の特性不良が生じるという惧れがあ
った。Therefore, due to the difference in thermal expansion coefficient between the solid electrolyte 47 and the substrate 42, the adhesive 55. Cracks may occur in the solid electrolyte 47 and the substrate 42, which may change the conductivity of oxygen ions or impair the sealing of the gap, leading to concerns that the characteristics of oxygen concentration detection may deteriorate. .
本発明は上記問題点に鑑みなされたものであり、温度サ
イクルによって酸素センサの特性不良が発生することを
防止して、長期に亘って安定した酸素濃度検出が行える
内燃機関用酸素センサを提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and provides an oxygen sensor for an internal combustion engine that can prevent the characteristic defects of the oxygen sensor from occurring due to temperature cycles and can stably detect oxygen concentration over a long period of time. The purpose is to
く問題点を解決するための手段〉
そのため本発明では、スペーサと固体電解質との接合面
をすり合わせて密着面を形成し、かつ、基板及び固体電
解質の基端を固定部材により一体的に挟持するようにす
る。Means for Solving the Problems> Therefore, in the present invention, the joint surfaces of the spacer and the solid electrolyte are rubbed together to form a close contact surface, and the base ends of the substrate and the solid electrolyte are integrally held by a fixing member. Do it like this.
く作用〉
かかる構成によると、スペーサと基板とは同時焼成され
て結合されるものであるから、間隙部の密閉性がスペー
サと固体電解質との接合面のすり合わせによって確保で
き、かつ、固定部材により基板及び固体電解質が保持さ
れるため、接着剤を廃止することが可能となる。従って
、熱膨張に対する自由度が増し、間隙部の密閉性を確保
しつつ基板及び固体電解質のひび割れが防止される。According to this configuration, since the spacer and the substrate are bonded by simultaneous firing, the sealing performance of the gap can be ensured by rubbing the joint surfaces of the spacer and the solid electrolyte, and the fixing member Since the substrate and solid electrolyte are retained, it is possible to eliminate adhesives. Therefore, the degree of freedom with respect to thermal expansion is increased, and cracking of the substrate and solid electrolyte is prevented while ensuring sealing of the gap.
〈実施例〉
以下に本発明の一実施例を図面に基づいて説明する。尚
、従来例と同一要素には同一符号を付して説明を省略す
る。<Example> An example of the present invention will be described below based on the drawings. Incidentally, the same elements as those in the conventional example are given the same reference numerals and the explanation thereof will be omitted.
第１図に本実施例における内燃機関用酸素センサのセン
サ素子部２１を示す。FIG. 1 shows a sensor element section 21 of an oxygen sensor for an internal combustion engine in this embodiment.
図に示すように、酸素ポンプ部５ｏを構成する固体重解
質４７とスペーサ５１との接合面を研磨して密着面６０
を形成する。As shown in the figure, the bonding surface between the solid polymer 47 and the spacer 51 constituting the oxygen pump section 5o is polished to form a contact surface 60.
form.
そして、かかる密着面６０によってスペーサ５１と酸素
ポンプ部５０とを密着積層させたセンサ素子部２１を、
第２図の全体断面図に示すようにその中間部で２つのワ
ッシャ２２．２３及びガラスＭ２４を介してホルダ２５
によって保持する。前記ホルダ２５先端側外周には、ス
リット２６ａを有するプロテクタ２６がセンサ素子部２
１先端部を覆うようにして嵌合し、またホルダ２５基端
側外周は、円筒状のアウタキャンプ２７に嵌合挟持され
ている。Then, the sensor element part 21 in which the spacer 51 and the oxygen pump part 50 are laminated in close contact with each other by the contact surface 60 is formed.
As shown in the overall sectional view of FIG. 2, the holder 25
held by. A protector 26 having a slit 26a is provided on the outer periphery of the distal end of the holder 25 to protect the sensor element portion 2.
The outer periphery of the holder 25 on the proximal end side is fitted and held in a cylindrical outer camp 27 so as to cover the distal end portion of the holder 25 .
センサ素子部２１の基端部は、ガラス層２８を介して円
筒状のインナキャンプ２９によって保持されており、セ
ンサ素子部２１の測定電極４３．４４、ポンプ電極４８
．４９及びヒータ４１に接続する電極端子部３０がそれ
ぞれリードプレート３１を介してリードハ−ネス３２と
電気的に接続されている。尚、３３はリードプレート３
１とリードハーネス３２との接続部３４を保護するグロ
メット、３５はガスケツｌ−ホルダである。The base end of the sensor element section 21 is held by a cylindrical inner camp 29 via a glass layer 28, and the measurement electrodes 43, 44 and pump electrodes 48 of the sensor element section 21
．． 49 and the electrode terminal portion 30 connected to the heater 41 are electrically connected to the lead harness 32 via the lead plate 31, respectively. In addition, 33 is the lead plate 3
A grommet 35 protects a connecting portion 34 between the lead harness 32 and the lead harness 32, and 35 is a gasket L-holder.
このように、センサ素子部２１はその基端部が組み立て
時に固定部材としてのワッシャ２２．２３．ガラス層２
４．２８等によって固定保持される。このため、固体電
解質４７が枠状のスペーサ５１側に押し付けられて、ス
ペーサ５１と基板とは同時焼成によって結合されるので
、前記密着面６０によってスペーサ５１の内側に密閉さ
れた間隙部５２を形成する。In this way, the sensor element section 21 has its proximal end attached to the washers 22, 23, . glass layer 2
4.28 etc. is fixedly held. Therefore, the solid electrolyte 47 is pressed against the frame-shaped spacer 51, and the spacer 51 and the substrate are bonded by simultaneous firing, so that a sealed gap 52 is formed inside the spacer 51 by the contact surface 60. do.
かかる酸素センサによると、従来のように枠状のスペー
サ５１の外周に接着剤を充填する必要がないため、固体
電解質４７及び基板４２の熱膨張に対する自由度が増し
、温度サイクルによってひび割れを発生することが防止
できる。従って、間隙部５２の密閉性が確保されると共
に、酸素イオンの伝轟性が一定に保たれ、長期に亘って
安定した酸素濃度の検出ができる。According to this oxygen sensor, there is no need to fill the outer periphery of the frame-shaped spacer 51 with adhesive as in the conventional case, so the degree of freedom for thermal expansion of the solid electrolyte 47 and the substrate 42 is increased, and cracks may occur due to temperature cycles. This can be prevented. Therefore, the airtightness of the gap 52 is ensured, the propagation of oxygen ions is kept constant, and the oxygen concentration can be detected stably over a long period of time.
〈発明の効果〉
以上説明したように、本発明によると、スペーサと固体
電解質との接合面をすり合わせて密着面を形成し、かつ
、基板及び固体電解質の基端側を固定部材により一体的
に挟持したことにより、従来スペーサの外周に充填され
ていた接着剤を廃止することが可能となり、温度サイク
ルによる基板及び固体電解質のひび割れや間隙部の密閉
不良を防止できる。<Effects of the Invention> As explained above, according to the present invention, the joint surfaces of the spacer and the solid electrolyte are rubbed together to form a close contact surface, and the base end sides of the substrate and the solid electrolyte are integrally connected by the fixing member. By sandwiching the spacer, it is possible to eliminate the adhesive that was conventionally filled around the outer periphery of the spacer, and it is possible to prevent cracks in the substrate and solid electrolyte and poor sealing of the gap due to temperature cycling.
従って、温度サイクルによって酸素センサの特性不良が
発生することが防がれ、長期に亘って安定した酸素濃度
検出が行える内燃機関用酸素センサを提供することがで
きる。Therefore, it is possible to prevent characteristic defects of the oxygen sensor from occurring due to temperature cycles, and to provide an oxygen sensor for an internal combustion engine that can stably detect oxygen concentration over a long period of time.
第１図は本発明の実施例のセンサ素子部を示す断面図、
第２図は同上実施例を示す全体断面図、第３図は従来例
のセンサ素子部を示す断面図である。
２１・・・センサ素子部 ２２．２３・・・ワッシャ
２４、２８・・・ガラス層 ２５・・・ホルダ ４
２・・・基板４３、４４・・・測定電極 ４５・・・
酸化物半導体 ４６・・・酸素濃度検出部 ４７・
・・固体電解質 ４８．４９・・・ポンプ電極 ５
０・・・酸素ポンプ部 ５１・・・スペーサ ５２
・・・間隙部 ５３・・・導入孔 ６０・・・密着
面特許出願人 日本電子機器株式会社
代理人 弁理士 笹 島 冨二雄
第１図
第３図FIG. 1 is a cross-sectional view showing a sensor element portion of an embodiment of the present invention;
FIG. 2 is an overall sectional view showing the same embodiment, and FIG. 3 is a sectional view showing a sensor element portion of a conventional example. 21...Sensor element part 22.23...Washers 24, 28...Glass layer 25...Holder 4
2... Substrates 43, 44... Measuring electrodes 45...
Oxide semiconductor 46...Oxygen concentration detection section 47.
...Solid electrolyte 48.49...Pump electrode 5
0...Oxygen pump part 51...Spacer 52
...Gap portion 53...Introduction hole 60...Adhesive surface Patent applicant Japan Electronics Co., Ltd. Agent Patent attorney Fujio Sasashima Figure 1 Figure 3
Claims (1)
、該一対の測定電極上に酸素濃度に応じて抵抗値が変化
する酸化物半導体を積層して酸素濃度検出部を形成する
と共に、酸素イオン伝導性の固体電解質の両面に一対の
ポンプ電極を設けて形成される酸素ポンプ部を前記基板
と同時焼成される枠状のスペーサを介して前記酸素濃度
検出部上方に設け、かつ酸素濃度検出部と酸素ポンプ部
との間に形成される間隙部に機関排気を導入する導入孔
を前記固体電解質に形成してなる内燃機関用酸素センサ
において、前記スペーサと固体電解質との接合面をすり
合わせて密着面を形成し、かつ、基板及び固体電解質の
基端を固定部材により一体的に挟持したことを特徴とす
る内燃機関用酸素センサ。A pair of measurement electrodes are arranged in parallel on a substrate equipped with a heater, and an oxide semiconductor whose resistance value changes depending on the oxygen concentration is laminated on the pair of measurement electrodes to form an oxygen concentration detection section, An oxygen pump section formed by providing a pair of pump electrodes on both sides of an oxygen ion conductive solid electrolyte is provided above the oxygen concentration detection section via a frame-shaped spacer that is co-fired with the substrate, and the oxygen concentration detection section is In the oxygen sensor for an internal combustion engine, the solid electrolyte is provided with an introduction hole for introducing engine exhaust gas into the gap formed between the detection part and the oxygen pump part, and the joint surfaces of the spacer and the solid electrolyte are rubbed together. An oxygen sensor for an internal combustion engine, characterized in that the base end of the substrate and the solid electrolyte are integrally held between fixing members.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60219213A JPS6280552A (en) | 1985-10-03 | 1985-10-03 | Oxygen sensor for internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60219213A JPS6280552A (en) | 1985-10-03 | 1985-10-03 | Oxygen sensor for internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6280552A true JPS6280552A (en) | 1987-04-14 |
Family
ID=16731976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60219213A Pending JPS6280552A (en) | 1985-10-03 | 1985-10-03 | Oxygen sensor for internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6280552A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01259252A (en) * | 1988-04-09 | 1989-10-16 | Ngk Spark Plug Co Ltd | Gas sensor |
| JPH11248674A (en) * | 1998-02-26 | 1999-09-17 | Ngk Spark Plug Co Ltd | Gas sensor |
| JP2014519042A (en) * | 2011-06-08 | 2014-08-07 | アルファ モス エス．アー． | Chemical resistor type gas sensor with multi-layer structure |
-
1985
- 1985-10-03 JP JP60219213A patent/JPS6280552A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01259252A (en) * | 1988-04-09 | 1989-10-16 | Ngk Spark Plug Co Ltd | Gas sensor |
| JPH11248674A (en) * | 1998-02-26 | 1999-09-17 | Ngk Spark Plug Co Ltd | Gas sensor |
| JP2014519042A (en) * | 2011-06-08 | 2014-08-07 | アルファ モス エス．アー． | Chemical resistor type gas sensor with multi-layer structure |
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