JPH0424098Y2 - - Google Patents
Info
- Publication number
- JPH0424098Y2 JPH0424098Y2 JP1985110578U JP11057885U JPH0424098Y2 JP H0424098 Y2 JPH0424098 Y2 JP H0424098Y2 JP 1985110578 U JP1985110578 U JP 1985110578U JP 11057885 U JP11057885 U JP 11057885U JP H0424098 Y2 JPH0424098 Y2 JP H0424098Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- pipe
- main
- bypass
- branch
- 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
- 239000007789 gas Substances 0.000 claims description 37
- 239000001301 oxygen Substances 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 238000000746 purification Methods 0.000 claims description 16
- 230000003197 catalytic effect Effects 0.000 claims description 15
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 description 9
- 230000006866 deterioration Effects 0.000 description 8
- 239000000446 fuel Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000013021 overheating Methods 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は内燃機関などから排出される有害物質
を除去する排気ガス浄化装置に関するものであ
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an exhaust gas purification device for removing harmful substances emitted from internal combustion engines and the like.
自動車エンジンなどから排出される排気ガス中
の有害成分例えばHC，CO，NOX等を除去する
ためにその排気系に触媒コンバータを取り付ける
とが行われる。又、エンジンの空燃比をフイード
バツク制御するために酸素濃度センサが使用さ
れ、該センサも排気系に取り付けられる。
Catalytic converters are installed in the exhaust systems of automobile engines to remove harmful components such as HC, CO, and NOx from exhaust gases. Additionally, an oxygen concentration sensor is used to feedback control the air-fuel ratio of the engine, and this sensor is also attached to the exhaust system.
しかして、上記空燃比フイードバツク制御装置
を備えた排気ガス浄化装置においては酸素濃度セ
ンサの配置が重要である。すなわち、酸素濃度セ
ンサの暖機性、応答性と耐久性の相反する条件を
満足させる必要がある。 Therefore, in an exhaust gas purification device equipped with the air-fuel ratio feedback control device, the arrangement of the oxygen concentration sensor is important. That is, it is necessary to satisfy contradictory conditions of warm-up performance, responsiveness, and durability of the oxygen concentration sensor.
従来は暖機性と活性化温度を保証するために、
高空気量域に於ては過熱するのを覚悟のうえで酸
素センサと触媒コンバータをともに排気系の上流
部分に配置し、過熱領域での空燃比を過濃にする
ことにより排気ガス温度を下げ、熱劣化を減少さ
せる方法がとられてきた。
Conventionally, in order to guarantee warm-up and activation temperature,
The oxygen sensor and catalytic converter are both placed in the upstream part of the exhaust system, being prepared for overheating in the high air flow range, and the exhaust gas temperature is lowered by enriching the air-fuel ratio in the overheating range. , methods have been taken to reduce thermal degradation.
しかしながら、このような方法は燃費特性を悪
化させると同時に排気ガス浄化特性の悪化
（HC，COの増加）を伴い、満足できるものでは
なかつた。又、例えば、過熱防止のために酸素セ
ンサと触媒コンバータを排気系の下流部分に取付
けると耐久性は向上するものの暖機性や応答性に
問題があつた。 However, such a method is not satisfactory because it causes a deterioration in fuel consumption characteristics and a deterioration in exhaust gas purification characteristics (increase in HC and CO). Furthermore, for example, when an oxygen sensor and a catalytic converter are installed downstream of the exhaust system to prevent overheating, durability is improved, but there are problems with warm-up and responsiveness.
本考案は上記従来技術における問題点を解決す
るためのものであり、その目的とするところは酸
素センサ及び排気ガス浄化用触媒への熱負荷を過
大とならないように調節することにより酸素セン
サ及び排気ガス浄化用触媒が常に良好な性能特性
を有する排気ガス浄化装置を提供することにあ
る。 The present invention is intended to solve the above-mentioned problems in the conventional technology, and its purpose is to adjust the heat load to the oxygen sensor and exhaust gas purification catalyst so as not to become excessive. An object of the present invention is to provide an exhaust gas purification device in which a gas purification catalyst always has good performance characteristics.
すなわち本考案の排気ガス浄化装置は、排気ガ
ス主配管に上流側と下流側とを連結するバイパス
配管を設け、該主配管とバイパス配管によつて形
成される二つの分岐部のうち上流側の分岐部に、
車輌の運転状態に応じて該バイパス配管側の流路
を開閉すると共に該主配管側の流路を拡大又は縮
小することにより該主配管に流れる排気ガス流量
を増減する流量制御弁を配置し、且つ前記二つの
分岐部の間の前記主配管に酸素センサを取付け、
下流側の分岐部の更に下流側の前記主配管に触媒
コンバーターを接続したことを特徴とする。
That is, in the exhaust gas purification device of the present invention, a bypass pipe is provided in the exhaust gas main pipe to connect the upstream side and the downstream side, and of the two branch parts formed by the main pipe and the bypass pipe, the upstream side At the branch,
A flow control valve is arranged that opens and closes a flow path on the bypass piping side and increases or decreases the flow rate of exhaust gas flowing into the main piping by expanding or contracting the flow path on the main piping side according to the operating state of the vehicle, and attaching an oxygen sensor to the main pipe between the two branch parts,
The present invention is characterized in that a catalytic converter is connected to the main pipe further downstream of the downstream branch.
主配管、バイパス配管、分岐部及び触媒コンバ
ータの大きさや形状等の性状並びに触媒コンバー
タの数等は特に限定されない。車種などに応じて
選択するのが好ましい。 Properties such as the size and shape of the main piping, bypass piping, branch portion, and catalytic converter, as well as the number of catalytic converters, etc. are not particularly limited. It is preferable to select according to the vehicle type.
触媒成分は通常使用されるもの例えば白金、ロ
ジウム、パラジウム等を用いることができる。更
に触媒活性を増加させる成分例えばランタン、セ
リウム等を添加してもよい。 As the catalyst component, commonly used catalyst components such as platinum, rhodium, palladium, etc. can be used. Furthermore, components that increase the catalytic activity, such as lanthanum and cerium, may be added.
酸素センサも特に種類や性状は限定されないが
例えばジルコニア、イツトリア等の酸素イオン透
過性固体電解質を使用した限界電流式酸素センサ
などが好ましい。取付る位置は主配管、バイパス
配管、酸素センサの性状及び車種などによつて異
なるが、例えば二つの分岐部の央部又はその近傍
とするとよい。 Although the type and properties of the oxygen sensor are not particularly limited, a limiting current type oxygen sensor using an oxygen ion permeable solid electrolyte such as zirconia or yttoria is preferable. The mounting position varies depending on the main pipe, the bypass pipe, the properties of the oxygen sensor, the vehicle model, etc., but it is preferable to install it, for example, in the center of the two branch parts or in the vicinity thereof.
流量制御弁の種類は特に限定されない。この弁
は分岐部の適する位置に１個設けてバイパス配管
側を開閉すると共に主配管側の流路を拡大又は縮
小することにより主配管に流れる排気ガス流量を
増減してもよいし、又、前記二つの配管の分岐部
の適する位置に各々設けて前記と同様に機能させ
てもよい。 The type of flow control valve is not particularly limited. This valve may be installed at a suitable position in the branch to open and close the bypass piping side, and expand or contract the flow path on the main piping side to increase or decrease the flow rate of exhaust gas flowing into the main piping, or, They may be provided at appropriate positions of the branch portions of the two pipes and function in the same manner as described above.
空気量センサによつて検出した吸入空気量、エ
ンジン回転数、エンジン回転数×吸気管負圧、ス
ロツトル開度、排気ガス温等の車輌の運転状態に
応じた信号をコンピユータで処理して予じめ設定
したプログラムに従つてアクチユエータを作動さ
せ、低吸入空気量域では分岐部のバイパス配管側
を閉め、高吸入空気量域では反対にバイパス配管
側を開けると共に同じ分岐部の主配管側の流路を
狭くして排気ガスを触媒コンバータに流す。
A computer processes signals according to vehicle operating conditions such as intake air amount, engine speed, engine speed x intake pipe negative pressure, throttle opening, and exhaust gas temperature detected by the air amount sensor. The actuator is operated according to the set program to close the bypass piping side of the branch in the low intake air volume range, and to open the bypass piping side in the high intake air volume range, while also closing the bypass piping side of the branch part in the high intake air volume range. The path is narrowed to allow exhaust gas to flow to the catalytic converter.
以下の実施例において、図面に基づいて本考案
を更に詳細に説明する。なお、本考案は下記実施
例に限定されるものではない。
In the following examples, the present invention will be explained in more detail on the basis of the drawings. Note that the present invention is not limited to the following examples.
第１図は本考案の排気ガス浄化装置の一実施例
の概略図である。図中、１は主配管、２はバイパ
ス配管、３は放射用フイン、４は触媒コンバー
タ、５は酸素センサ、６は流量制御弁、７は空気
量センサ、８はコンピユータ、９はアクチユエー
タを示す。 FIG. 1 is a schematic diagram of an embodiment of the exhaust gas purification device of the present invention. In the figure, 1 is the main pipe, 2 is the bypass pipe, 3 is the radiation fin, 4 is the catalytic converter, 5 is the oxygen sensor, 6 is the flow control valve, 7 is the air amount sensor, 8 is the computer, and 9 is the actuator. .
空気量センサ７で検知された空気量が酸素セン
サ５及び触媒コンバータ４中の触媒の熱劣化が問
題とならない様に空気量例えば100m3／ｈである
場合には、コンピユータ８はアクチユエータ９
に、流量制御弁６がバイパス配管２を閉じる側
（第２図に示す）に作動する信号を出す。このた
め、主配管１内を流れる排気ガスは主配管１側に
のみ流れ、酸素センサ５及び触媒コンバータ４の
暖機性及び活性温度維持のために有効に作用す
る。 When the amount of air detected by the air amount sensor 7 is, for example, 100 m 3 /h so that thermal deterioration of the oxygen sensor 5 and the catalyst in the catalytic converter 4 does not become a problem, the computer 8 detects the amount of air detected by the actuator 9.
Then, the flow control valve 6 issues a signal that operates to close the bypass pipe 2 (as shown in FIG. 2). Therefore, the exhaust gas flowing inside the main pipe 1 flows only to the main pipe 1 side, which effectively acts to maintain the warm-up performance and activation temperature of the oxygen sensor 5 and the catalytic converter 4.
又、空気量が増加して、酸素センサ５及び触媒
の熱劣化が問題となるような空気量例えば100
m3／ｈを越える場合には、空気量センサ７の信号
をコンピユータ８が受け、アクチユエータ９を介
して流量制御弁６をバイパス配管２を開く側（第
３図に示す）に動かす。これにより排気ガスの一
部がバイパス配管２側に流れるため、主配管１側
を流れる排気ガス流量が減少し、酸素センサ５へ
の熱負荷が軽減できる。一方、触媒コンバータ４
内を流れる流量はこの様な状態に於ても減少する
ことはないが、バイパス配管側を流れる排気ガス
は、放熱用フイン３等で放熱が促進され冷やされ
てから触媒コンバータ４に達するため、合流後の
排気ガス温度が低下し、触媒への熱負荷も軽減で
きる。又、バイパス配管２の肉厚を薄くしたり、
放熱用フイン３に風を当てて冷却する等の手段を
用いることにより、上記作用を更に強めることが
できる。 In addition, if the amount of air increases and thermal deterioration of the oxygen sensor 5 and the catalyst becomes a problem, for example, 100
m 3 /h, the computer 8 receives a signal from the air amount sensor 7 and moves the flow control valve 6 via the actuator 9 to the side where the bypass pipe 2 is opened (as shown in FIG. 3). As a result, part of the exhaust gas flows to the bypass pipe 2 side, so the flow rate of the exhaust gas flowing through the main pipe 1 side is reduced, and the thermal load on the oxygen sensor 5 can be reduced. On the other hand, catalytic converter 4
Although the flow rate inside the bypass pipe does not decrease even under such conditions, the exhaust gas flowing through the bypass pipe is cooled by promoting heat dissipation by the heat dissipation fins 3, etc., and then reaches the catalytic converter 4. The temperature of the exhaust gas after merging decreases, and the heat load on the catalyst can also be reduced. Also, by reducing the thickness of the bypass piping 2,
The above effect can be further strengthened by using a method such as cooling the heat dissipating fins 3 by blowing wind on them.
本実施例では流量制御弁６を制御するために空
気量センサ７からの信号を用いたが、排気ガス温
度と相関のある他の因子例えばエンジン回転数と
負荷等を用いてもよいし、主配管１に排気ガス温
度を直接検知する温度センサを取付け、その信号
によつて流量制御弁６を作動させてもよい。又、
空気量信号に代つて、排気ガス圧力がある一定値
以上（例えば150mmＨｇ以上）となつた場合に、
その圧力によつて制御弁６が作動し、バイパス配
管２側に排気ガスの一部を流すようにすることも
できる。 In this embodiment, the signal from the air amount sensor 7 is used to control the flow rate control valve 6, but other factors correlated with the exhaust gas temperature, such as engine speed and load, may also be used, or the main A temperature sensor that directly detects the exhaust gas temperature may be attached to the pipe 1, and the flow rate control valve 6 may be operated in response to a signal from the temperature sensor. or,
Instead of the air amount signal, when the exhaust gas pressure exceeds a certain value (for example, 150 mmHg or more),
The control valve 6 may be actuated by the pressure to allow a portion of the exhaust gas to flow to the bypass pipe 2 side.
上述のように本考案の排気ガス浄化装置は、酸
素センサを取付けた排気ガス主配管に該酸素セン
サを迂回するバイパス配管を設け、前記主配管と
バイパス配管によつて形成される二つの分岐部の
うち上流側の分岐部に流量制御弁を配置したもの
であるため、主配管及びバイパス配管内を流れる
排気ガス流量を調節することにより過度の熱負荷
及び排気ガス中の被毒物による酸素センサ特性の
劣化を防ぎ且つその破損を防止する。又、酸素セ
ンサ特性の劣化に起因する排気ガス浄化性能の低
下を阻止する。更に、バイパス配管内を流れる排
気ガスを冷却することができるため過熱による排
気ガス浄化用触媒の浄化特性の劣化を軽減するこ
とができる。又、空燃比の過濃化の程度を小さく
できるため燃費特性及び排気ガス浄化特性
（HC，CO）を向上させる。
As described above, in the exhaust gas purification device of the present invention, the exhaust gas main pipe to which the oxygen sensor is attached is provided with a bypass pipe that bypasses the oxygen sensor, and the two branch parts formed by the main pipe and the bypass pipe are separated. Since a flow control valve is placed at the upstream branch of the system, the flow rate of exhaust gas flowing through the main piping and bypass piping can be adjusted to prevent excessive heat load and oxygen sensor characteristics caused by poisonous substances in the exhaust gas. to prevent deterioration and damage. Further, it prevents deterioration of exhaust gas purification performance due to deterioration of oxygen sensor characteristics. Furthermore, since the exhaust gas flowing through the bypass pipe can be cooled, deterioration of the purification characteristics of the exhaust gas purification catalyst due to overheating can be reduced. Furthermore, since the degree of over-enrichment of the air-fuel ratio can be reduced, fuel efficiency and exhaust gas purification characteristics (HC, CO) are improved.
本考案の装置は上記効果を奏するとともに、酸
素センサ及び排気ガス浄化用触媒の暖機性を維持
し、暖機後の活性化温度を充分保証することがで
きる。 The device of the present invention not only achieves the above-mentioned effects, but also maintains the warm-up performance of the oxygen sensor and the exhaust gas purification catalyst, and can sufficiently guarantee the activation temperature after warm-up.
第１図は本考案の排気ガス浄化装置の一実施例
の概略図、第２図は第１図に示す装置において流
量制御弁がバイパス配管を閉じる側に作動した状
態を示す部分拡大図、第３図は第１図に示す装置
において流量制御弁がバイパス配管を開ける側に
作動した状態を示す部分拡大図である。
図中、１……主配管、２……バイパス配管、３
……放射用フイン、４……触媒コンバータ、５…
…酸素センサ、６……流量制御弁、７……空気量
センサ、８……コンピユータ、９……アクチユエ
ータ。
Fig. 1 is a schematic diagram of an embodiment of the exhaust gas purification device of the present invention, and Fig. 2 is a partially enlarged view showing the device shown in Fig. 1 in which the flow control valve is operated to close the bypass pipe. FIG. 3 is a partially enlarged view showing a state in which the flow control valve is operated to open the bypass pipe in the apparatus shown in FIG. 1. In the diagram, 1...Main piping, 2...Bypass piping, 3
...Radiation fin, 4...Catalytic converter, 5...
...Oxygen sensor, 6...Flow rate control valve, 7...Air amount sensor, 8...Computer, 9...Actuator.
Claims (1)
バイパス配管を設け、該主配管とバイパス配管に
よつて形成される二つの分岐部のうち上流側の分
岐部に、車輌の運転状態に応じて該バイパス配管
側の流路を開閉すると共に該主配管側の流路を拡
大又は縮小することにより該主配管に流れる排気
ガス流量を増減する流量制御弁を配置し、且つ前
記二つの分岐部の間の前記主配管に酸素センサを
取付け、下流側の分岐部の更に下流側の前記主配
管に触媒コンバーターを接続したことを特徴とす
る排気ガス浄化装置。 A bypass pipe is provided in the exhaust gas main pipe that connects the upstream side and the downstream side, and the upstream branch of the two branch parts formed by the main pipe and the bypass pipe is equipped with a pipe that connects the upstream side and the downstream side. a flow control valve that opens and closes the flow path on the bypass piping side and increases or decreases the flow rate of exhaust gas flowing into the main piping by expanding or contracting the flow path on the main piping side; An exhaust gas purification device characterized in that an oxygen sensor is attached to the main pipe between the two, and a catalytic converter is connected to the main pipe further downstream of the branch on the downstream side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985110578U JPH0424098Y2 (en) | 1985-07-19 | 1985-07-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985110578U JPH0424098Y2 (en) | 1985-07-19 | 1985-07-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6218319U JPS6218319U (en) | 1987-02-03 |
| JPH0424098Y2 true JPH0424098Y2 (en) | 1992-06-05 |
Family
ID=30989703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985110578U Expired JPH0424098Y2 (en) | 1985-07-19 | 1985-07-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0424098Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716012Y2 (en) * | 1988-02-16 | 1995-04-12 | 日産自動車株式会社 | Exhaust purification device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52113101U (en) * | 1976-02-25 | 1977-08-27 | ||
| JPS52138106U (en) * | 1976-04-15 | 1977-10-20 | ||
| JPS5694815U (en) * | 1979-12-24 | 1981-07-28 |
-
1985
- 1985-07-19 JP JP1985110578U patent/JPH0424098Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6218319U (en) | 1987-02-03 |
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