JPH09105324A - Exhaust emission control device of internal combustion engine - Google Patents

Exhaust emission control device of internal combustion engine

Info

Publication number
JPH09105324A
JPH09105324A JP7261208A JP26120895A JPH09105324A JP H09105324 A JPH09105324 A JP H09105324A JP 7261208 A JP7261208 A JP 7261208A JP 26120895 A JP26120895 A JP 26120895A JP H09105324 A JPH09105324 A JP H09105324A
Authority
JP
Japan
Prior art keywords
lean
exhaust gas
internal combustion
combustion engine
catalyst
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
Application number
JP7261208A
Other languages
Japanese (ja)
Inventor
Toshifumi Hiratsuka
俊史 平塚
Yuichi Kitahara
雄一 北原
Takeshi Inoue
猛 井上
Hidehiro Iizuka
秀宏 飯塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Hitachi Automotive Systems Engineering Co Ltd
Original Assignee
Hitachi Ltd
Hitachi Car Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, Hitachi Car Engineering Co Ltd filed Critical Hitachi Ltd
Priority to JP7261208A priority Critical patent/JPH09105324A/en
Publication of JPH09105324A publication Critical patent/JPH09105324A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2046—Periodically cooling catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/05—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

PROBLEM TO BE SOLVED: To lower catalyst inlet exhaust temperature in small space, and enhance NOx purifying performance in operation by lean-burn by having a lean NOx catalyst for purifying NOx, and arranging a radiation means in an exhaust pipe connecting an engine and the lean NOx catalyst. SOLUTION: In a lean-burn engine capable of operating in a lean air fuel ratio than the theoretical air fuel ratio, a lean NOx catalyst 2 arranged in an exhaust emission control device is a honeycomb catalyst, and has the function for purifying NOx under an oxygen high concentration atmosphere in lean-burn. An engine 1 and the lean NOx catalyst 2 are connected with an exhaust pipe 3, and the exhaust pipe 3 has radiation plates 4 radially arranged in the position where air flows during running of a vehicle. The surface area of the exhaust pipe 3 is widened by the area of the radiation plates 4, part coming in contact with air is increased, catalyst inlet exhaust temperature is lowered, and NOx purifying performance in lean-burn is enhanced.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、自動車等の内燃機
関からの排気を浄化する装置に係り、特に、希薄燃焼が
可能である内燃機関からの排気中に含まれるＮＯｘ等の
有害物を浄化することが可能なリーンＮＯｘ触媒を備え
た内燃機関の排気浄化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for purifying exhaust gas from an internal combustion engine such as an automobile, and more particularly to purifying harmful substances such as NOx contained in exhaust gas from the internal combustion engine capable of lean combustion. The present invention relates to an exhaust emission control device for an internal combustion engine equipped with a lean NOx catalyst that can be used.

【０００２】[0002]

【従来の技術】今日、燃費向上等を目的としたリーンバ
ーンエンジンが実用化されている。リーンバーンエンジ
ンは理論空燃比時に比べ排気中に酸素が多く存在してい
るが、従来の三元触媒では酸素高濃度雰囲気下でＮＯｘ
を浄化しきれない。そのため、それに代わるリーンＮＯ
ｘ触媒が開発されている。2. Description of the Related Art Today, lean burn engines have been put into practical use for the purpose of improving fuel efficiency. Compared to the stoichiometric air-fuel ratio, the lean-burn engine has more oxygen in the exhaust gas, but the conventional three-way catalyst has NOx
Cannot be purified. Therefore, lean NO instead
x catalysts have been developed.

【０００３】リーンＮＯｘ触媒のＮＯｘ浄化率は、図２
に示すように、一般に触媒入口排気温度に対してピーク
を持つが、希薄燃焼時の触媒入口排気温度はピークより
高温側にある。The NOx purification rate of the lean NOx catalyst is shown in FIG.
As shown in, the temperature generally has a peak with respect to the exhaust gas temperature at the catalyst inlet, but the exhaust gas temperature at the catalyst inlet during lean combustion is on the higher temperature side than the peak.

【０００４】特開平7−127439 号公報によると、プリサ
イレンサを触媒より上流側に配置し、プリサイレンサで
の断熱膨張を利用して触媒入口排気温度を低下させて、
NOx浄化率のピークで触媒が使用されるようにしてい
る。According to Japanese Unexamined Patent Publication No. 7-127439, a pre-silencer is arranged upstream of the catalyst, and adiabatic expansion of the pre-silencer is used to lower the exhaust gas temperature at the catalyst inlet,
The catalyst is used at the peak of NOx purification rate.

【０００５】[0005]

【発明が解決しようとする課題】特開平7−127439 号公
報の方法を用いる場合、基本構造を変えねばならない。
他に、触媒入口排気温度を下げる手段としてエンジンか
ら触媒までの距離を長くするという方法が考えられる
が、自動車の床下の搭載空間の問題について考えると有
効な手段とはいえない。When using the method of Japanese Patent Laid-Open No. 7-127439, the basic structure must be changed.
Another possible method for lowering the exhaust gas temperature at the catalyst inlet is to increase the distance from the engine to the catalyst, but this is not an effective means when considering the problem of the mounting space under the floor of the automobile.

【０００６】本発明の目的は、希薄燃焼での運転時に触
媒入口排気温度を下げ、ＮＯｘの浄化性能を向上させる
ことにある。It is an object of the present invention to lower the exhaust gas temperature at the catalyst inlet at the time of operation in lean combustion to improve the NOx purification performance.

【０００７】[0007]

【課題を解決するための手段】上記目的は、希薄燃焼で
の運転時にＮＯｘを浄化できるリーンＮＯｘ触媒を備え
ている排気浄化装置で、内燃機関とリーンＮＯｘ触媒と
を接続する排気管に放熱手段を設けることにより達成さ
れる。The above object is to provide an exhaust gas purification apparatus equipped with a lean NOx catalyst capable of purifying NOx when operating in lean combustion, in which a heat radiation means is provided in an exhaust pipe connecting the internal combustion engine and the lean NOx catalyst. It is achieved by providing.

【０００８】本発明の内燃機関の排気浄化装置により、
低コストかつ小スペースで触媒入口排気温度を低下さ
せ、その結果、希薄燃焼による運転時のＮＯｘ浄化性能
を向上させることができる。According to the exhaust gas purifying apparatus for an internal combustion engine of the present invention,
The catalyst inlet exhaust gas temperature can be lowered at a low cost and in a small space, and as a result, the NOx purification performance during operation by lean combustion can be improved.

【０００９】[0009]

【発明の実施の形態】以下、本発明の実施例を説明す
る。Embodiments of the present invention will be described below.

【００１０】実施例１を図１で説明する。A first embodiment will be described with reference to FIG.

【００１１】図１で、エンジン１は、理論空燃比より希
薄な空燃比での運転が可能な内燃機関である。In FIG. 1, an engine 1 is an internal combustion engine capable of operating at an air-fuel ratio leaner than the stoichiometric air-fuel ratio.

【００１２】リーンＮＯｘ触媒２は、円形または楕円形
状をしたハニカム触媒で、希薄燃焼時の酸素高濃度雰囲
気下でＮＯｘを浄化する機能を有している。また、リー
ンＮＯｘ触媒２は金属性容器の中に固定された形で自動
車に設けられている。The lean NOx catalyst 2 is a honeycomb catalyst having a circular or elliptical shape, and has a function of purifying NOx in an oxygen high concentration atmosphere during lean combustion. Further, the lean NOx catalyst 2 is provided in the automobile while being fixed in a metallic container.

【００１３】エンジン１とリーンＮＯｘ触媒２は排気管
３で接続され、排気管３には、車両走行時に空気の流れ
る位置に放熱板４が放射状に設けられている。The engine 1 and the lean NOx catalyst 2 are connected by an exhaust pipe 3, and a heat radiating plate 4 is radially provided in the exhaust pipe 3 at a position where air flows when the vehicle is traveling.

【００１４】図２にリーンＮＯｘ触媒２の希薄空燃比時
の触媒入口排気温度に対するＮＯｘ浄化性能を表わす。FIG. 2 shows the NOx purification performance with respect to the exhaust gas temperature at the catalyst inlet when the lean NOx catalyst 2 has a lean air-fuel ratio.

【００１５】図２で、リーンＮＯｘ触媒２は、希薄空燃
比時に、ある温度Ｔ1(例えば２５０℃）にＮＯｘ浄化ピ
ークを持っている。また、放熱板取り付け前の希薄燃焼
時の走行で触媒入口排気温度の上限値Ｔ2 （例えば３７
０℃）はＮＯｘ浄化ピークより高温側にある。In FIG. 2, the lean NOx catalyst 2 has a NOx purification peak at a certain temperature T 1 (for example, 250 ° C.) at a lean air-fuel ratio. In addition, the upper limit value T 2 (for example, 37
(0 ° C.) is on the higher temperature side than the NOx purification peak.

【００１６】リーンＮＯｘ触媒２及び排気管３は、車両
走行時に空気の流れがあるため、外面が常に空気に触れ
ていることになり、触媒入口排気温度はその影響を受け
る。実施例１で図１のように放熱板４を取り付けると、
排気管３の表面積が放熱板４の分だけ広くなり空気に隣
接する部分が増える。そのため空気への熱伝達が高ま
り、放熱板取り付け前に比べ排気の熱が排気管３と放熱
板４を通して空気中により多く放出され、触媒入口排気
温度を低下させることが可能となる。これにより、触媒
入口排気温度の上限値Ｔ2 をＮＯｘ浄化率ピーク温度Ｔ
1 に近づけることができ、希薄燃焼時のＮＯｘ浄化性能
を向上させることができる。Since the lean NOx catalyst 2 and the exhaust pipe 3 have a flow of air when the vehicle is running, the outer surfaces of the lean NOx catalyst 2 and the exhaust pipe 3 are always in contact with the air, and the exhaust gas temperature at the catalyst inlet is affected by the influence. When the heat sink 4 is attached as shown in FIG. 1 in the first embodiment,
The surface area of the exhaust pipe 3 is increased by the amount of the heat dissipation plate 4, and the area adjacent to the air is increased. Therefore, heat transfer to the air is enhanced, and more heat of exhaust gas is released into the air through the exhaust pipe 3 and the heat radiating plate 4 than before the heat radiating plate is attached, so that the catalyst inlet exhaust gas temperature can be lowered. As a result, the upper limit value T 2 of the exhaust gas temperature at the catalyst inlet is set to the NOx purification rate peak temperature T
It is possible to approach 1 and improve the NOx purification performance during lean combustion.

【００１７】実施例２を図３で説明する。The second embodiment will be described with reference to FIG.

【００１８】図３で、エンジン１とリーンＮＯｘ触媒２
は排気管３で接続され、排気管３の車両走行時に空気の
流れる位置に、１枚の放熱板４を交互に数回曲げ蛇行し
た形状のものを排気管３の外側を１周させて設けてい
る。In FIG. 3, the engine 1 and the lean NOx catalyst 2 are shown.
Are connected by the exhaust pipe 3, and one heat radiating plate 4 is alternately bent and meandered several times at a position where the air flows when the vehicle is traveling. ing.

【００１９】本実施例２で、実施例１と同様の効果によ
り希薄燃焼時のＮＯｘ浄化性能を向上させることができ
る。In the second embodiment, the NOx purification performance during lean combustion can be improved by the same effect as in the first embodiment.

【００２０】実施例３を図４で説明する。A third embodiment will be described with reference to FIG.

【００２１】図４で、排気浄化装置は、実施例１の構造
に加え、放熱板４の外側に放熱板４を排気管３と挟んだ
形でより径の大きい管５が設けられている。4, in addition to the structure of the first embodiment, the exhaust gas purification apparatus is provided with a pipe 5 having a larger diameter outside the heat dissipation plate 4 with the heat dissipation plate 4 sandwiched between the exhaust pipe 3.

【００２２】実施例３で、実施例１と同様の効果により
希薄燃焼時のＮＯｘ浄化性能を向上させることができ
る。また、放熱板４が管５に覆われているため、何も覆
ってない場合と比較してみると強い構造に成り、石跳ね
等に対する強度を得ることができる。In the third embodiment, the NOx purification performance during lean combustion can be improved by the same effect as in the first embodiment. Further, since the heat dissipation plate 4 is covered with the pipe 5, it has a stronger structure as compared with the case where it is not covered with anything, and it is possible to obtain strength against stone bounce and the like.

【００２３】実施例４を図５で説明する。A fourth embodiment will be described with reference to FIG.

【００２４】図５で、排気浄化装置は、実施例１の構造
で、放熱板４はプレート状のものを排気管３に圧入等を
して設け、その放熱板４取り付け部を地面に対し鉛直方
向にダクト６が覆い、上流側に送風機７を設けている。
また温度を制御する手段として、リーンＮＯｘ触媒入口
部に温度センサ８，温度センサ８により送風機７の風量
を制御する電子制御装置（ＥＣＵ）９が設けられてい
る。In FIG. 5, the exhaust emission control device has the structure of the first embodiment, and the heat dissipation plate 4 is provided by pressing the exhaust pipe 3 into the exhaust pipe 3, and the installation part of the heat dissipation plate 4 is perpendicular to the ground. The duct 6 covers in the direction, and the blower 7 is provided on the upstream side.
As a means for controlling the temperature, a temperature sensor 8 and an electronic control unit (ECU) 9 for controlling the air volume of the blower 7 by the temperature sensor 8 are provided at the lean NOx catalyst inlet.

【００２５】実施例４で、送風機７で強制的に風を送る
ことにより触媒入口排気温度の上限値Ｔ2 をＮＯｘ浄化
率ピーク温度Ｔ1 に近づけることができる。またそれに
加え、温度センサ８が検出した触媒入口排気温度情報を
ＥＣＵ９に送りそれに基づきファン７の風量を調節する
ことによって、温度をＮＯｘ浄化率ピーク温度Ｔ1 付近
に制御することが可能となり、希薄燃焼時のＮＯｘ浄化
性能を向上させることができる。In the fourth embodiment, the upper limit value T 2 of the exhaust gas temperature at the catalyst inlet can be brought close to the NOx purification rate peak temperature T 1 by forcibly sending air by the blower 7. In addition to this, by sending the catalyst inlet exhaust gas temperature information detected by the temperature sensor 8 to the ECU 9 and adjusting the air volume of the fan 7 based on it, it becomes possible to control the temperature to near the NOx purification rate peak temperature T 1. The NOx purification performance during combustion can be improved.

【００２６】[0026]

【発明の効果】本発明の内燃機関の排気浄化装置で、実
施例１，２，３より、低コストかつ小スペースで触媒入
口排気温度を低下させ、希薄燃焼による運転時のＮＯｘ
浄化性能を向上させることができる。また、実施例４よ
り温度をよりＮＯｘ浄化率ピーク温度Ｔ1付近に制御す
ることができる。In the exhaust gas purification apparatus for an internal combustion engine according to the present invention, the catalyst inlet exhaust gas temperature can be lowered at a low cost and in a small space as compared with the first, second and third embodiments, and NOx during operation by lean combustion.
The purification performance can be improved. Further, the temperature can be controlled to be closer to the NOx purification rate peak temperature T 1 than in the fourth embodiment.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の実施例１の排気浄化装置の説明図。FIG. 1 is an explanatory diagram of an exhaust emission control device according to a first embodiment of the present invention.

【図２】希薄空燃比での触媒入口排気温度とＮＯｘ浄化
率の特性図。FIG. 2 is a characteristic diagram of a catalyst inlet exhaust temperature and a NOx purification rate at a lean air-fuel ratio.

【図３】本発明の実施例２の排気浄化装置の説明図。FIG. 3 is an explanatory diagram of an exhaust emission control device according to a second embodiment of the present invention.

【図４】本発明の実施例３の排気浄化装置の説明図。FIG. 4 is an explanatory diagram of an exhaust emission control device according to a third embodiment of the present invention.

【図５】本発明の実施例４の排気浄化装置の説明図。FIG. 5 is an explanatory diagram of an exhaust emission control device according to a fourth embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１…エンジン、２…リーンＮＯｘ触媒、３…排気管、４
…放熱板、５…管、６…ダクト、７…送風機、８…温度
センサ、９…電子制御装置。1 ... Engine, 2 ... Lean NOx catalyst, 3 ... Exhaust pipe, 4
... heat sink, 5 ... tube, 6 ... duct, 7 ... blower, 8 ... temperature sensor, 9 ... electronic control device.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 井上 猛 茨城県ひたちなか市高場2477番地 株式会 社日立カーエンジニアリング内 (72)発明者 飯塚 秀宏 茨城県日立市大みか町七丁目１番１号 株 式会社日立製作所日立研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Inoue 2477 Takaba, Hitachinaka City, Ibaraki Prefecture Hitachi Car Engineering Co., Ltd. (72) Inventor Hidehiro Iizuka 7, 1-1 Omikacho, Hitachi City Inside the Hitachi Research Laboratory, Hitachi Ltd.

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】希薄燃焼が可能である内燃機関と、前記内
燃機関より排出されるＮＯｘを浄化する機能を持つリー
ンＮＯｘ触媒を有する排気浄化装置において、車両の走
行時、前記リーンＮＯｘ触媒の入口における排気温度が
低下するように、前記内燃機関と前記リーンＮＯｘ触媒
とを接続する排気管に放熱手段を設けたことを特徴とす
る内燃機関の排気浄化装置。1. An exhaust gas purification apparatus having an internal combustion engine capable of lean combustion and a lean NOx catalyst having a function of purifying NOx discharged from the internal combustion engine, the inlet of the lean NOx catalyst when a vehicle is running. An exhaust gas purification apparatus for an internal combustion engine, wherein a heat radiating means is provided in an exhaust pipe connecting the internal combustion engine and the lean NOx catalyst so that the exhaust gas temperature in the exhaust gas is lowered. 【請求項２】請求項１において、前記放熱手段を車両の
走行時に空気の流れの影響を受ける位置に設けた内燃機
関の排気浄化装置。2. The exhaust gas purification device for an internal combustion engine as set forth in claim 1, wherein the heat radiation means is provided at a position affected by the flow of air when the vehicle is running. 【請求項３】請求項２において、前記放熱手段として放
熱板を用いた内燃機関の排気浄化装置。3. The exhaust gas purification device for an internal combustion engine according to claim 2, wherein a heat dissipation plate is used as the heat dissipation means. 【請求項４】請求項３において、前記放熱板を設けた排
気管の周りを前記排気管より径の大きい管で覆う内燃機
関の排気浄化装置。4. The exhaust gas purifying apparatus for an internal combustion engine according to claim 3, wherein the exhaust pipe provided with the heat dissipation plate is covered with a pipe having a diameter larger than that of the exhaust pipe. 【請求項５】請求項２，請求項３又は請求項４におい
て、送風機を設け、前記放熱手段を設けた部分を冷却す
る内燃機関の排気浄化装置。5. An exhaust gas purifying apparatus for an internal combustion engine according to claim 2, claim 3 or claim 4, wherein a blower is provided and a portion provided with the heat radiating means is cooled. 【請求項６】請求項５において、前記送風機の風量を調
節することにより触媒入口排気温度を制御する装置を備
えた内燃機関の排気浄化装置。6. The exhaust gas purification device for an internal combustion engine according to claim 5, comprising a device for controlling a catalyst inlet exhaust gas temperature by adjusting an air volume of the blower.
JP7261208A 1995-10-09 1995-10-09 Exhaust emission control device of internal combustion engine Pending JPH09105324A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7261208A JPH09105324A (en) 1995-10-09 1995-10-09 Exhaust emission control device of internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7261208A JPH09105324A (en) 1995-10-09 1995-10-09 Exhaust emission control device of internal combustion engine

Publications (1)

Publication Number Publication Date
JPH09105324A true JPH09105324A (en) 1997-04-22

Family

ID=17358651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7261208A Pending JPH09105324A (en) 1995-10-09 1995-10-09 Exhaust emission control device of internal combustion engine

Country Status (1)

Country Link
JP (1) JPH09105324A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014221580A (en) * 2013-05-13 2014-11-27 ヤンマー株式会社 Work vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014221580A (en) * 2013-05-13 2014-11-27 ヤンマー株式会社 Work vehicle

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