JPH0442488Y2 - - Google Patents
Info
- Publication number
- JPH0442488Y2 JPH0442488Y2 JP1986153584U JP15358486U JPH0442488Y2 JP H0442488 Y2 JPH0442488 Y2 JP H0442488Y2 JP 1986153584 U JP1986153584 U JP 1986153584U JP 15358486 U JP15358486 U JP 15358486U JP H0442488 Y2 JPH0442488 Y2 JP H0442488Y2
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel ratio
- exhaust
- exhaust gas
- ratio detector
- 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
Links
Landscapes
- Exhaust Silencers (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、エンジンの空燃比検出装置に関し、
特に、排気通路に配設する空燃比検出器の取付部
の構造に関するものである。[Detailed description of the invention] (Field of industrial application) The present invention relates to an air-fuel ratio detection device for an engine.
In particular, the present invention relates to the structure of a mounting portion of an air-fuel ratio detector disposed in an exhaust passage.
（従来の技術）
従来より、エンジンに供給された混合気の空燃
比を排気ガスの成分濃度から検出し、エンジンに
供給する空燃比制御を行うについて、例えば、多
気筒エンジンの排気系をデユアルマニホールドで
形成し、排気通路間の隔壁に排気通路を連通する
切欠を設け、この切欠に空燃比検出器を取付ける
ようにした構造が、実公昭56−27394号公報に見
られるように公知である。(Prior art) Conventionally, the air-fuel ratio of the air-fuel mixture supplied to the engine is detected from the component concentration of exhaust gas, and the air-fuel ratio supplied to the engine is controlled. For example, the exhaust system of a multi-cylinder engine is equipped with a dual manifold. As seen in Japanese Utility Model Publication No. 56-27394, a structure is known in which a notch is provided in the partition wall between the exhaust passages to communicate the exhaust passages, and an air-fuel ratio detector is attached to this notch.
そして、前記空燃比検出器は、高温の排気ガス
に接触して反応温度を維持し検出精度を確保する
とともに、各気筒の排気ガスと均等に接触してエ
ンジン全体の平均値を検出して全体としての制御
精度の向上を図ることが要求される。 The air-fuel ratio detector contacts the high-temperature exhaust gas to maintain the reaction temperature and ensure detection accuracy, and also contacts the exhaust gas of each cylinder evenly to detect the average value of the entire engine. Therefore, it is necessary to improve the control accuracy.
（考案が解決しようとする問題点）
しかして、排気系の比較的下流側に検出器を配
設すると、各気筒の排気ガスと均等に接触するこ
とになるが、排気ガス温度の低下によつて反応温
度が低くなるものであり、低負荷領域等の排気ガ
ス温度の低い領域では充分な反応温度に達せず、
良好な空燃比の検出が行えない恐れがある。(Problem that the invention attempts to solve) However, if the detector is placed relatively downstream in the exhaust system, it will come into contact with the exhaust gas of each cylinder equally, but due to the decrease in exhaust gas temperature, Therefore, the reaction temperature becomes low, and in areas where the exhaust gas temperature is low, such as in low load areas, a sufficient reaction temperature cannot be reached.
There is a possibility that a good air-fuel ratio cannot be detected.
また、排気通路の上流側の部分においては、排
気ガスの混合が不十分で各気筒の排気ガスに均等
に接触させることが困難であるとともに、独立し
た排気通路の隔壁に各排気通路を連通する切欠を
形成してこの切欠に臨んで空燃比検出器を配設す
ることは、複数の独立排気通路が入組んで構成さ
れている部分への取付構造の形成が煩雑であり、
取付性の面から好ましくない。 In addition, in the upstream part of the exhaust passage, the exhaust gas is not sufficiently mixed and it is difficult to make it come into contact with the exhaust gas of each cylinder evenly, and each exhaust passage is connected to an independent partition wall of the exhaust passage. Forming a notch and arranging the air-fuel ratio sensor facing the notch requires a complicated installation structure in a part where a plurality of independent exhaust passages are intricately constructed.
Unfavorable from the viewpoint of installation.
そこで、本考案は上記事情に鑑み、空燃比検出
器に各気筒の排気ガスが均等に接触するとともに
その取付性に優れたエンジンの空燃比検出装置を
提供することを目的とするものである。 SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide an air-fuel ratio detection device for an engine that allows exhaust gas from each cylinder to come into uniform contact with the air-fuel ratio detector and is easy to install.
（問題点を解決するための手段）
本考案の空燃比検出装置は、エンジンの各気筒
に各々独立して接続された排気通路の集合部の直
下流に空燃比検出器を設けるとともに、該空燃比
検出器の直上流の独立排気通路に各独立排気通路
を各々連通する連通部を設けたことを特徴とする
ものである。(Means for Solving the Problems) The air-fuel ratio detection device of the present invention is provided with an air-fuel ratio detector immediately downstream of the gathering part of the exhaust passages connected to each cylinder of the engine independently, and The present invention is characterized in that the independent exhaust passages immediately upstream of the fuel ratio detector are provided with communication portions that communicate with each of the independent exhaust passages.
（作用）
上記のような空燃比検出装置では、エンジンの
各気筒から排出された排気ガスは独立排気通路を
流下し、その集合部の直下流で高い排気ガス温度
の状態で空燃比検出器に接触するとともに、この
集合部の直上流の連通部によつて各独立排気通路
の排気ガスが流通混合し、各気筒の排気ガスが均
等に空燃比検出器に接触し、その反応温度も高く
検出精度に優れる。(Function) In the air-fuel ratio detection device as described above, the exhaust gas discharged from each cylinder of the engine flows down the independent exhaust passage, and directly downstream of the collecting part, the exhaust gas reaches the air-fuel ratio detector at a high exhaust gas temperature. At the same time, the exhaust gases from each independent exhaust passage are circulated and mixed by the communication section immediately upstream of this collecting section, and the exhaust gases from each cylinder are evenly contacted with the air-fuel ratio detector, and the reaction temperature is also detected to be high. Excellent accuracy.
また、集合部に空燃比検出器を配置することに
より、この空燃比検出器の取付けが容易に行える
ものである。 Further, by arranging the air-fuel ratio detector in the gathering part, the air-fuel ratio detector can be easily attached.
（実施例）
以下、図面に沿つて本考案の実施例を説明す
る。第１図は空燃比検出器を取付けた排気マニホ
ールドの正面図、第２図はその側面図である。(Example) Hereinafter, an example of the present invention will be described along with the drawings. FIG. 1 is a front view of an exhaust manifold equipped with an air-fuel ratio detector, and FIG. 2 is a side view thereof.
エンジン１のシリンダブロツク２上に設置され
たシリンダヘツド３には、各気筒（図の場合４気
筒）の排気ポート４ａ〜４ｄから排気ガスを導出
する排気マニホールド５が、上流端の取付フラン
ジ５ａで取付け固定される。この排気マニホール
ド５は各気筒に対してそれぞれ独立した独立排気
通路６ａ〜６ｄを備え、この独立排気通路６ａ〜
６ｄは下流側の集合部７に連通開口し、それぞれ
の独立排気通路６ａ〜６ｄを流下した排気ガスが
合流するように構成されている。排気ガスは排気
マニホールド５の下流端の流出口８から排出さ
れ、その取付フランシ５ｂが図示しない下流側の
排気系に接続される。 The cylinder head 3 installed on the cylinder block 2 of the engine 1 has an exhaust manifold 5 installed at the upstream end of the mounting flange 5a to guide exhaust gas from the exhaust ports 4a to 4d of each cylinder (four cylinders in the figure). Installed and fixed. This exhaust manifold 5 includes independent exhaust passages 6a to 6d for each cylinder, and these independent exhaust passages 6a to 6d.
6d is configured to communicate with the collecting portion 7 on the downstream side, so that the exhaust gases flowing down the respective independent exhaust passages 6a to 6d join together. Exhaust gas is discharged from an outlet 8 at the downstream end of the exhaust manifold 5, and its mounting flange 5b is connected to a downstream exhaust system (not shown).
そして、上記集合部７の直下流に空燃比検出器
９が取付けられている。この空燃比検出器９は基
部９ａが排気マニホールド５に固定され、棒状の
検出部９ｂが排気マニホールド５の外側から中心
部に向けて挿入され、この検出部９ｂに排気ガス
が接触するように設けられている。 An air-fuel ratio detector 9 is installed immediately downstream of the collecting section 7. This air-fuel ratio detector 9 has a base 9a fixed to the exhaust manifold 5, and a rod-shaped detection part 9b inserted from the outside of the exhaust manifold 5 toward the center, and is provided so that the exhaust gas comes into contact with the detection part 9b. It is being
また、前記空燃比検出器９が配設された集合部
７の直上流側の独立排気通路６ａ〜６ｄには、第
３図にも示すように、各独立排気通路６ａ〜６ｄ
を相互に連通する連通部１０が形成されている。
この連通部１０は、各独立排気通路６ａ〜６ｄの
隔壁５ｃに開口を形成することによつて構成され
ている。 In addition, as shown in FIG.
A communication portion 10 is formed to communicate with each other.
This communication portion 10 is constructed by forming an opening in the partition wall 5c of each independent exhaust passage 6a to 6d.
上記のような実施例においては、各気筒の排気
ポート４ａ〜４ｄから排出された排気ガスは、
各々独立排気通路６ａ〜６ｄを流下して、集合部
７近傍の連通部１０において相互に流通混合して
から集合部７に流入し、さらに混合して空燃比検
出器９の検出部９ｂに接触し、この排気ガス中の
酸素濃度等から空燃比が検出されるものである。 In the embodiment described above, the exhaust gas discharged from the exhaust ports 4a to 4d of each cylinder is
Each of them flows down the independent exhaust passages 6a to 6d, flows through and mixes with each other in the communication part 10 near the collecting part 7, flows into the collecting part 7, and mixes further, and comes into contact with the detection part 9b of the air-fuel ratio detector 9. However, the air-fuel ratio is detected from the oxygen concentration in the exhaust gas.
なお、上記独立排気通路６ａ〜６ｄの集合部７
までの長さは、排気干渉をなくして高速域で充填
効率が向上するように比較的長く設定されるもの
であり、前記連通部１０によつて各独立排気通路
６ａ〜６ｄが連通されるが、この連通部１０があ
つても高速時には排気流通量も増大しており、そ
の特性には殆ど影響を与えないものである。 In addition, the gathering part 7 of the independent exhaust passages 6a to 6d
The length is set to be relatively long so as to eliminate exhaust interference and improve charging efficiency in the high speed range, and each independent exhaust passage 6a to 6d is communicated with each other by the communication portion 10. Even if this communication section 10 is provided, the exhaust gas flow rate also increases at high speeds, and the characteristics are hardly affected.
（考案の効果）
上記のような本考案によれば、各々独立した排
気通路の集合部の直下流に空燃比検出器を設ける
とともに、該空燃比検出器の直上流に各独立排気
通路を各々連通する連通部を設けたことにより、
エンジンの各気筒から排気された排気ガスは高い
排気ガス温度の状態で空燃比検出器に接触すると
ともに、この集合部の直上流の連通部によつて各
独立排気通路の排気ガスが流通混合し、各気筒の
排気ガスが均等に空燃比検出器に接触し、高い検
出精度を得ることができる。(Effect of the invention) According to the invention as described above, an air-fuel ratio detector is provided immediately downstream of the gathering portion of each independent exhaust passage, and each independent exhaust passage is provided immediately upstream of the air-fuel ratio detector. By providing a communicating section,
Exhaust gas exhausted from each cylinder of the engine comes into contact with the air-fuel ratio detector at a high exhaust gas temperature, and the exhaust gas from each independent exhaust passage is circulated and mixed by the communication section immediately upstream of this collecting section. , the exhaust gas from each cylinder contacts the air-fuel ratio detector equally, making it possible to obtain high detection accuracy.
また、集合部に空燃比検出器を設置することに
より、この空燃比検出器の取付けが容易に行え取
付性に優れるものである。 Further, by installing the air-fuel ratio detector in the gathering part, the air-fuel ratio detector can be easily installed, and the installation is excellent.
第１図は本考案の一実施例における空燃比検出
器装置の正面図、第２図はその側面図、第３図は
第２図の−線に沿う断面端面図である。
１……エンジン、５……排気マニホールド、６
ａ〜６ｄ……独立排気通路、７……集合部、９…
…空燃比検出器、１０……連通部。
FIG. 1 is a front view of an air-fuel ratio detector device according to an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a cross-sectional end view taken along the line - in FIG. 1...Engine, 5...Exhaust manifold, 6
a to 6d...Independent exhaust passage, 7...Collection part, 9...
...Air-fuel ratio detector, 10...Communication section.
Claims (1)
続され、該独立排気通路の集合部の直下流に空燃
比検出器が設けられるとともに、該空燃比検出器
の直上流の独立排気通路に各独立排気通路を各々
連通する連通部が設けられたことを特徴とするエ
ンジンの空燃比検出装置。 An independent exhaust passage is connected to each cylinder of the engine, an air-fuel ratio detector is provided immediately downstream of the gathering part of the independent exhaust passage, and each independent exhaust passage is connected to the independent exhaust passage immediately upstream of the air-fuel ratio detector. An air-fuel ratio detection device for an engine, characterized in that a communication portion is provided that communicates each passage with the other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986153584U JPH0442488Y2 (en) | 1986-10-06 | 1986-10-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986153584U JPH0442488Y2 (en) | 1986-10-06 | 1986-10-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63115521U JPS63115521U (en) | 1988-07-26 |
| JPH0442488Y2 true JPH0442488Y2 (en) | 1992-10-07 |
Family
ID=31072600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986153584U Expired JPH0442488Y2 (en) | 1986-10-06 | 1986-10-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0442488Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE602005021706D1 (en) | 2005-07-01 | 2010-07-15 | Gifu Plastic Industry Co Ltd | FOLDING BOXES CREATED FROM ARTIFICIAL RESIN |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5836808Y2 (en) * | 1975-06-27 | 1983-08-19 | 川崎重工業株式会社 | motorcycle exhaust system |
| JPS58169112U (en) * | 1982-05-10 | 1983-11-11 | トヨタ自動車株式会社 | exhaust manifold |
-
1986
- 1986-10-06 JP JP1986153584U patent/JPH0442488Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63115521U (en) | 1988-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0143642Y2 (en) | ||
| US3938330A (en) | Exhaust manifold with sluice valve | |
| US4304208A (en) | Internal combustion engine | |
| WO2001034960A3 (en) | Method of monitoring the exhaust catalyst of an internal combustion engine | |
| JPH01193043A (en) | Two cycle internal combustion engine | |
| JP2007224877A (en) | Installation structure of exhaust sensor to exhaust pipe of internal combustion engine | |
| EP1213454A3 (en) | Exhaust manifold for internal combustion engine | |
| US6745561B2 (en) | Exhaust manifold for vehicle | |
| FR2767198B1 (en) | METHOD FOR CONTROLLING THE OPERATING CAPACITY OF A LAMBDA PROBE | |
| US5768890A (en) | Exhaust air rail manifold | |
| JPH01169350A (en) | Oxygen sensor | |
| JPH0442488Y2 (en) | ||
| JP3631859B2 (en) | Manifold converter | |
| JP4061677B2 (en) | Engine exhaust purification system | |
| JP2933644B2 (en) | Engine exhaust gas purification device | |
| JPH0627791Y2 (en) | Exhaust pipe | |
| JPH0143477Y2 (en) | ||
| JPS6146453Y2 (en) | ||
| JPS6335155Y2 (en) | ||
| JPS6115208Y2 (en) | ||
| JPH0521619Y2 (en) | ||
| JPH0541215Y2 (en) | ||
| JPH09280039A (en) | Exhaust manifold with o2 sensor | |
| JPH0224897Y2 (en) | ||
| JPS5836810Y2 (en) | Exhaust manifold for internal combustion engines |