JPH068799B2 - Oxygen concentration detector for exhaust gas purification system in gas engine - Google Patents
Oxygen concentration detector for exhaust gas purification system in gas engineInfo
- Publication number
- JPH068799B2 JPH068799B2 JP59080892A JP8089284A JPH068799B2 JP H068799 B2 JPH068799 B2 JP H068799B2 JP 59080892 A JP59080892 A JP 59080892A JP 8089284 A JP8089284 A JP 8089284A JP H068799 B2 JPH068799 B2 JP H068799B2
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- oxygen concentration
- exhaust gas
- insulating material
- heat insulating
- 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
- 239000007789 gas Substances 0.000 title claims description 21
- 239000001301 oxygen Substances 0.000 title claims description 13
- 229910052760 oxygen Inorganic materials 0.000 title claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 12
- 238000000746 purification Methods 0.000 title claims description 5
- 239000011810 insulating material Substances 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 239000007784 solid electrolyte Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 description 11
- 239000003054 catalyst Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、ガス機関における排気浄化システムの酸素濃
度検出装置、特にそのO2センサの取付部の構造に関する
ものである。Description: TECHNICAL FIELD The present invention relates to an oxygen concentration detection device for an exhaust gas purification system in a gas engine, and more particularly to a structure of a mounting portion of an O 2 sensor thereof.
〈従来の技術〉 自動車の排気ガス対策として、排気ガス中の酸素濃度を
検出して空燃比を制御することは周知であり、このため
に開発されたO2センサを自動車以外の一般の内燃機関や
ボイラ等の排気浄化システムに利用し、排気ガス中に含
まれるNOx、ＣＯ、ＨＣに有効な三元触媒と組合せて上
記の有害成分の浄化を行なうことも広く行なわれてい
る。この場合、三元触媒には空燃比がλ＝１の時にその
浄化作用が最も効果的に発揮される性質があるため、排
気ガス中の酸素濃度をO2センサを用いた酸素濃度検出装
置で検出して制御系にフィードバックし、触媒入口にお
ける排気ガスの空燃比がλ＝１となるように制御するこ
とが一般に行なわれる。<Prior art> It is well known that the air-fuel ratio is controlled by detecting the oxygen concentration in the exhaust gas as a measure for the exhaust gas of the automobile, and the O 2 sensor developed for this purpose is used for general internal combustion engines other than automobiles. It is also widely used to purify the above-mentioned harmful components in combination with a three-way catalyst effective for NOx, CO, and HC contained in the exhaust gas, by utilizing it in an exhaust purification system of a boiler or the like. In this case, since the three-way catalyst has the property that its purifying action is most effectively exhibited when the air-fuel ratio is λ = 1, the oxygen concentration in the exhaust gas can be detected by the oxygen concentration detecting device using the O 2 sensor. In general, it is detected and fed back to the control system so that the air-fuel ratio of the exhaust gas at the catalyst inlet becomes λ = 1.
上述のO2センサとして現在実用化されているのは、ほぼ
円筒状のジルコニア固体電解質を用いた濃淡電池型のも
のであって、一方の面を酸素濃度の基準となる大気側と
し、他方の面を排気ガス側として両面の酸素分圧の差に
よって起電力を生じさせる構造となっている。第５図は
このようなO2センサの一例を示したものであり、(1)は
上記の固体電解質からなるセラミック製のセンサ本体、
(2)は支持部材、(3)は先端に取付けられたシールドチュ
ーブ、(4)は保護スリーブ、(5)は接続コイル、(6)はリ
ード線である。支持部材(2)にはナット部(2a)とねじ部
(2b)が形成されており、これを利用して排気管等への取
付けが行なわれる。センサ本体(1)の内面は、支持部材
(2)と保護スリーブ(4)との間に形成される間隙(7)や保
護スリーブ(4)の末端の穴(8)等の空気流入孔を介して大
気と通じているが、取付面から保護スリーブ(4)の末端
までの長さＡは通常60mm程度の寸法となっている。What is currently put into practical use as the above-mentioned O 2 sensor is a concentration battery type that uses a substantially cylindrical zirconia solid electrolyte, one surface of which is the atmosphere side that serves as a reference for oxygen concentration, and the other is With the surface on the exhaust gas side, an electromotive force is generated by the difference in oxygen partial pressure on both surfaces. FIG. 5 shows an example of such an O 2 sensor, (1) is a ceramic sensor body made of the above solid electrolyte,
(2) is a support member, (3) is a shield tube attached to the tip, (4) is a protective sleeve, (5) is a connecting coil, and (6) is a lead wire. The support member (2) has a nut part (2a) and a screw part.
(2b) is formed, and it is used to attach to an exhaust pipe or the like. The inner surface of the sensor body (1) is a support member.
(2) and the protective sleeve (4) are communicated with the atmosphere through a gap (7) formed between the protective sleeve (4) and an air inlet hole such as a hole (8) at the end of the protective sleeve (4). The length A from the end to the end of the protective sleeve (4) is usually about 60 mm.
〈発明が解決しようとする問題点〉 上記のように、O2センサは大気中の酸素濃度を基準とす
るものであるため、O2センサの外周部には常に新鮮な大
気が供給される必要があり、自動車の場合には走行風の
利用などによって大気を流通させることができる。しか
し、ガス機関の場合は据付形の設備であるためO2センサ
の外周の空気が澱みやすく、O2センサの出力に誤差が出
る可能性がある。特に排気ガスの持つ熱エネルギーを回
収する方式の設備の場合には、排気管にO2センサの外部
長よりも厚い50〜100mm程度の断熱材が巻かれ、しかもO
2センサは制御の応答遅れをなくすために三元触媒の近
くに配置されるためO2センサが断熱材の中に埋れてしま
い、O2センサ外周の空気の流通が極めて悪く検出出力の
誤差が大きくなりやすいものであり、適正な制御が期待
できなくなるという問題点があった。<Problems to be Solved by the Invention> As described above, since the O 2 sensor is based on the oxygen concentration in the atmosphere, it is necessary to always supply fresh air to the outer peripheral portion of the O 2 sensor. In the case of an automobile, the atmosphere can be circulated by using traveling wind. However, in the case of gas engine O 2 the outer periphery of the air tends stagnation sensor for an installation type facilities, there is a possibility that an error may be observed in the output of the O 2 sensor. Particularly in the case of equipment that recovers the thermal energy of exhaust gas, the exhaust pipe is wrapped with a heat insulating material of about 50 to 100 mm, which is thicker than the external length of the O 2 sensor.
Since the 2 sensor is placed near the three-way catalyst to eliminate the control response delay, the O 2 sensor is buried in the heat insulating material, and the air circulation around the O 2 sensor is extremely poor, resulting in an error in the detection output. Since it tends to be large, there is a problem that proper control cannot be expected.
本発明は上述のような問題点に着目し、O2センサの外周
に強制送風することにより常に正確な検出出力の得られ
る排気浄化システムの酸素濃度検出装置を提供すること
を目的としてなされたものである。The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an oxygen concentration detection device for an exhaust gas purification system that can always obtain an accurate detection output by forcibly blowing air around the O 2 sensor. Is.
〈問題点を解決するための手段〉 上記の目的を達成するために、本発明は、ガス機関にお
いて断熱材によって覆われた排気管の所定箇所に断熱材
で覆われないセンサ取付部を形成して第５図に例示した
ようなタイプのO2センサを取付けるとともに、このO2セ
ンサの外周に向けて空気を強制送風する送風手段を設け
たことを特徴としている。<Means for Solving the Problems> In order to achieve the above object, the present invention forms a sensor mounting portion not covered with a heat insulating material at a predetermined position of an exhaust pipe covered with a heat insulating material in a gas engine. In addition to mounting an O 2 sensor of the type illustrated in FIG. 5, air blowing means for forcibly blowing air toward the outer circumference of the O 2 sensor is provided.
〈実施例〉 以下、図面に示した実施例により本発明を具体的に説明
する。<Examples> Hereinafter, the present invention will be described in detail with reference to Examples shown in the drawings.
第１図は第１の実施例の概略構造図を示すものであり、
(11)はガスを燃料として運転されるガス機関、(12)は機
関(11)により駆動される発電機等の負荷装置、(13)は機
関(11)の排気管、(14)は断熱材、(15)はセンサ取付部で
ある。断熱材(14)は図では断面で示してあるが、実際は
排気管(13)の外周の全体にラギングされており、その一
部に断熱材(14)のないセンサ取付部(15)が形成されてい
る。(16)はセンサ取付部(15)に取付けられたO2センサ、
(17)はセンサ取付部(15)より下流側において排気管(13)
に形成された触媒収納部であり、触媒収納部(17)の内部
には三元触媒(18)が設けられ、O2センサ(16)は先端のシ
ールドチューブ(3)を排気管(13)の内部に突出させた状
態で固定されている。(21)は機関(11)等の設備一式を収
納しているキュービクル形のパッケージ、(22)は空気取
入口、(23)は空気出口、(24)は換気ファンであり、換気
ファン(24)は空気取入口(22)の内側に配置され、しかも
センサ取付部(15)に送風が当たる位置に設けられてお
り、排気管(13)はパッケージ(21)の外部に導出されてい
る。FIG. 1 is a schematic structural diagram of the first embodiment,
(11) is a gas engine operated with gas as fuel, (12) is a load device such as a generator driven by the engine (11), (13) is an exhaust pipe of the engine (11), and (14) is heat insulation. Material (15) is a sensor mounting portion. Although the heat insulating material (14) is shown in cross section in the figure, it is actually lagging the entire outer circumference of the exhaust pipe (13), and a sensor mounting part (15) without the heat insulating material (14) is formed in a part of it. Has been done. (16) is the O 2 sensor mounted on the sensor mounting part (15),
(17) is the exhaust pipe (13) downstream from the sensor mounting part (15)
The three-way catalyst (18) is provided inside the catalyst storage part (17), and the O 2 sensor (16) connects the shield tube (3) at the tip to the exhaust pipe (13). It is fixed in a state of protruding inside the. (21) is a cubicle type package that stores a set of equipment such as an engine (11), (22) is an air intake, (23) is an air outlet, (24) is a ventilation fan, and a ventilation fan (24 ) Is arranged inside the air intake port (22) and is provided at a position where the sensor mounting portion (15) is blown with air, and the exhaust pipe (13) is led out of the package (21).
本実施例は上述のように構成されているので、換気ファ
ン(24)を運転するとパッケージ(21)内の空気全体の換気
と機関(11)等に対する冷却が行なわれるが、同時に風の
一部がセンサ取付部(15)に送られてO2センサ(16)の外周
には新しい空気が供給される。従って基準となる酸素濃
度は常に正常値に保たれ、O2センサ(16)の検出出力に誤
差が生ずることが防止されるのである。Since this embodiment is configured as described above, when the ventilation fan (24) is operated, the entire air in the package (21) is ventilated and the engine (11) and the like are cooled, but at the same time, a part of the wind is blown. Is sent to the sensor mounting portion (15), and fresh air is supplied to the outer circumference of the O 2 sensor (16). Therefore, the reference oxygen concentration is always kept at a normal value, and an error is prevented from occurring in the detection output of the O 2 sensor (16).
第２図は第２の実施例であって基本的な構成は第１図の
ものと同様であるが、センサ取付部(15)と換気ファン(2
4)との間に空気通路(25)を設けた点が異なっている。空
気通路(25)は、換気ファン(24)の風の一部が有効にセン
サ取付部(15)に送られるようにパイプやダクト類等を用
いて適宜形成されるものであり、センサ取付部(15)と換
気ファン(24)の位置関係に制約がある場合や両者の間に
障害物があるような場合に適している。FIG. 2 shows a second embodiment having the same basic configuration as that of FIG. 1, except that the sensor mounting portion (15) and the ventilation fan (2
The difference is that an air passage (25) is provided between the above and 4). The air passage (25) is appropriately formed by using pipes or ducts so that part of the wind of the ventilation fan (24) can be effectively sent to the sensor mounting portion (15). This is suitable when there is a restriction on the positional relationship between (15) and the ventilation fan (24) or when there is an obstacle between them.
以上の実施例はパッケージ(21)の換気を行なう換気ファ
ン(24)を利用したものであるが、第３図は、換気ファン
(24)を用いないで専用の送風ファン(26)を設けるととも
に、送風ファン(26)の風をセンサ取付部(15)まで送る送
風管(27)を設けた第３の実施例を示したものである。こ
の場合には、センサ取付部(15)の位置が自由に選択でき
る利点があり、また小形なファンで効率よくO2センサの
外周の換気を行なうことが可能となる。The above embodiment uses the ventilation fan (24) for ventilation of the package (21), but FIG. 3 shows the ventilation fan.
A third embodiment is shown in which a dedicated blower fan (26) is provided without using (24) and a blower pipe (27) is provided that sends the wind of the blower fan (26) to the sensor mounting portion (15). It is a thing. In this case, there is an advantage that the position of the sensor mounting portion (15) can be freely selected, and it is possible to efficiently ventilate the outer circumference of the O 2 sensor with a small fan.
ところで、排気管(13)のラギングに用いられる断熱材(1
4)には、アスベスト繊維のような不燃性材料をバインダ
で結合したものが一般に用いられており、排気管(13)の
熱によってバインダが気化してO2センサ(16)の周辺に漂
い、O2センサ(16)が気化ガスの影響を受けて正常な検出
値を示さなくなることがあり、この現象は設備が新しい
時に特に著しい。By the way, the heat insulating material (1
In 4), a non-combustible material such as asbestos fiber bonded with a binder is generally used, and the binder is vaporized by the heat of the exhaust pipe (13) and drifts around the O 2 sensor (16). The O 2 sensor (16) may be affected by the vaporized gas and may not show a normal detection value, and this phenomenon is particularly remarkable when the equipment is new.
第４図はこのような不都合を防止した第４の実施例であ
り、センサ取付部(15)にO2センサ(16)と断熱材(14)との
間を遮断する遮蔽筒(30)を設けたものである。遮蔽筒(3
0)は断熱材(14)の厚さ以上の長さを有する片側が開放し
た有底筒状であって、例えばO2センサ(16)とともに排気
管(13)に共締めして取付けられ、遮蔽筒(30)内には上述
したような適宜の送風手段、例えば送風管(27)によって
空気が送られるようになっている。本実施例はこのよう
に構成されているので、断熱材(14)から発生するバイン
ダの気化ガスがO2センサ(16)に達してO2センサ(16)の動
作に悪影響を与えることは確実に防止されるのである。FIG. 4 shows a fourth embodiment which prevents such an inconvenience. The sensor mounting portion (15) is provided with a shield cylinder (30) for blocking between the O 2 sensor (16) and the heat insulating material (14). It is provided. Shield tube (3
(0) is a bottomed cylinder with one side having a length equal to or greater than the thickness of the heat insulating material (14), and is attached together with the exhaust pipe (13) together with the O 2 sensor (16), Air is blown into the shield cylinder (30) by the above-mentioned appropriate blower means, for example, the blower pipe (27). Since this embodiment is configured as described above, it is ensuring that the vaporized gas of the binder generated from the heat insulating material (14) is an adverse effect on the operation of the O 2 sensor O 2 sensor reaches the (16) (16) Will be prevented.
なお、断熱材(14)の厚さが過大な場合は、O2センサ(16)
のリード線(6)が熱の澱みにより熱損する虞があるた
め、例えば、遮蔽筒(30)の長さを断熱材(14)の厚さより
も短くし、遮蔽筒(30)の外端より外側となる断熱材(14)
の穴の内周面を拡開状（テーパ状）としてその拡開状穴
の内周面にアルミニウム箔などを貼り、外気との換気が
良好に行なわれるような構造とすることが望ましい。If the insulation (14) is too thick, the O 2 sensor (16)
Since the lead wire (6) of the above may be thermally lost due to heat stagnation, for example, the length of the shielding tube (30) is made shorter than the thickness of the heat insulating material (14) so that the outer end of the shielding tube (30) is Outer insulation (14)
It is desirable that the inner peripheral surface of the hole is expanded (tapered) and an aluminum foil or the like is attached to the inner peripheral surface of the expanded hole so that ventilation with the outside air can be performed well.
〈発明の効果〉 以上の各実施例の説明からも明らかなように、本発明
は、O2センサ取付部に送風手段によって強制送風するよ
うにしているので、厚い断熱材が使用される大形のガス
機関においても、O2センサ外周には常に新しい空気が供
給されて基準となる酸素濃度が正常に保たれ、O2センサ
の検出出力に誤差が生ずることが防止されるのである。<Effects of the Invention> As is apparent from the above description of each embodiment, since the present invention is configured to forcibly blow air to the O 2 sensor mounting portion by the air blowing means, a large heat insulating material is used. Even in the gas engine described above, fresh air is constantly supplied to the outer circumference of the O 2 sensor to keep the reference oxygen concentration normal, thereby preventing an error in the detection output of the O 2 sensor.
第１図は本発明の一実施例の概略側面図、第２図は他の
実施例の概略側面図、第３図は別の実施例の要部の断面
図、第４図は更に別の実施例の要部の拡大断面図、第５
図はO2センサの一例の一部の破断側面図である。 (11)……機関、(13)……排気管、(14)……断熱材、(15)
……センサ取付部、(16)……O2センサ、(24)……換気フ
ァン、(25)……空気通路、(26)……送風ファン、(27)…
…送風管、(30)……遮蔽筒。FIG. 1 is a schematic side view of an embodiment of the present invention, FIG. 2 is a schematic side view of another embodiment, FIG. 3 is a sectional view of a main part of another embodiment, and FIG. 5 is an enlarged sectional view of an essential part of the embodiment, FIG.
The figure is a partially cutaway side view of an example of the O 2 sensor. (11) …… Engine, (13) …… Exhaust pipe, (14) …… Insulation, (15)
…… Sensor mount, (16) …… O 2 sensor, (24) …… Ventilation fan, (25) …… Air passage, (26) …… Blower fan, (27)…
… Blower, (30) …… shielding cylinder.
Claims (1)
箇所に断熱材で覆われないセンサ取付部を形成し、酸素
イオン伝導性固体電解質を使用した濃淡電池型であって
空気流入孔を備えた保護スリーブを有するタイプのO2セ
ンサを取付けるとともに、このO2センサの外周に向けて
空気を強制送風する送風手段を設けたことを特徴とする
ガス機関における排気浄化システムの酸素濃度検出装
置。1. A concentration battery type using an oxygen ion conductive solid electrolyte in which a sensor mounting portion which is not covered with a heat insulating material is formed at a predetermined portion of an exhaust pipe covered with a thick heat insulating material and which has an air inlet hole. An oxygen concentration detection device for an exhaust gas purification system in a gas engine, characterized in that an O 2 sensor of a type having a protective sleeve provided is mounted, and a blower means for forcibly blowing air toward the outer periphery of the O 2 sensor is provided. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59080892A JPH068799B2 (en) | 1984-04-20 | 1984-04-20 | Oxygen concentration detector for exhaust gas purification system in gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59080892A JPH068799B2 (en) | 1984-04-20 | 1984-04-20 | Oxygen concentration detector for exhaust gas purification system in gas engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60224057A JPS60224057A (en) | 1985-11-08 |
| JPH068799B2 true JPH068799B2 (en) | 1994-02-02 |
Family
ID=13731007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59080892A Expired - Lifetime JPH068799B2 (en) | 1984-04-20 | 1984-04-20 | Oxygen concentration detector for exhaust gas purification system in gas engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH068799B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009042165A (en) * | 2007-08-10 | 2009-02-26 | Energy Support Corp | Gas analyzing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1536718A (en) * | 1975-03-31 | 1978-12-20 | Nissan Motor | Method of controlling air-fuel mixture in an internal combustion engine and a system therefor |
| JPS543686U (en) * | 1977-06-11 | 1979-01-11 | ||
| JPS5912602Y2 (en) * | 1977-06-14 | 1984-04-16 | トヨタ自動車株式会社 | Waterproof device for internal combustion engine oxygen concentration detector |
| JPS5534269U (en) * | 1978-08-28 | 1980-03-05 | ||
| JPS604125Y2 (en) * | 1979-07-31 | 1985-02-05 | 日本碍子株式会社 | oxygen concentration detector |
| JPS6040847Y2 (en) * | 1980-03-24 | 1985-12-10 | 大阪瓦斯株式会社 | Gas engine exhaust gas denitrification equipment |
| JPS6346841Y2 (en) * | 1981-03-06 | 1988-12-05 | ||
| JPS57150219U (en) * | 1981-03-16 | 1982-09-21 | ||
| JPS58172543A (en) * | 1982-04-02 | 1983-10-11 | Nippon Denso Co Ltd | Oxygen concentration detector |
| JPS58154460U (en) * | 1982-04-10 | 1983-10-15 | トヨタ自動車株式会社 | Oxygen sensor with heater |
-
1984
- 1984-04-20 JP JP59080892A patent/JPH068799B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60224057A (en) | 1985-11-08 |
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