JP2000249003A - Egr cooler with exhaust gas purifying function - Google Patents
Egr cooler with exhaust gas purifying functionInfo
- Publication number
- JP2000249003A JP2000249003A JP11052645A JP5264599A JP2000249003A JP 2000249003 A JP2000249003 A JP 2000249003A JP 11052645 A JP11052645 A JP 11052645A JP 5264599 A JP5264599 A JP 5264599A JP 2000249003 A JP2000249003 A JP 2000249003A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- cooling
- egr cooler
- layer
- passage
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、エンジン、特に
ディーゼルエンジンにおける一部の排気ガスを吸気路側
に還流させる排気ガス還流通路（ＥＧＲ通路）に配設さ
れる排気浄化機能付きＥＧＲクーラーに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EGR cooler with an exhaust gas purifying function provided in an exhaust gas recirculation passage (EGR passage) for recirculating a part of exhaust gas in an engine, particularly in a diesel engine to an intake passage. is there.
【０００２】[0002]
【従来の技術】ディーゼルエンジンにおいて、ＥＧＲ通
路を介して一部の排気ガスを吸気路側に還流させること
によって、ＮＯｘを低減させるとともに、ＥＧＲ通路中
にＥＧＲクーラーを配設することにより、還流される排
気ガスの温度を低下させ、さらなるＮＯｘ低減を図るこ
とが知られている（例えば特開平６−６６２０８号公報
参照）。2. Description of the Related Art In a diesel engine, a part of exhaust gas is recirculated to an intake passage through an EGR passage to reduce NOx, and is recirculated by disposing an EGR cooler in the EGR passage. It is known that the temperature of exhaust gas is lowered to further reduce NOx (see, for example, JP-A-6-66208).
【０００３】[0003]
【発明が解決しようとする課題】上記のような従来のＥ
ＧＲ装置においては、ＥＧＲクーラーによって還流され
る排気ガスの温度を下げ、エンジンの筒内温度を下げた
上で排気還流率（ＥＧＲ率）を稼いでいたが、排気ガス
中のすすによってエンジン内部例えばピストンリング、
シリンダライナー、バルブシート面等の摩耗を促進し、
エンジンの耐久性を縮めてしまっていた。SUMMARY OF THE INVENTION As described above, the conventional E
In the GR device, the temperature of the exhaust gas recirculated by the EGR cooler is lowered, and the exhaust gas recirculation rate (EGR rate) is obtained after the temperature in the cylinder of the engine is lowered. piston ring,
Promotes wear on cylinder liners, valve seat surfaces, etc.
The durability of the engine had been reduced.
【０００４】本発明は、このような従来技術の問題点を
解消して、ＥＧＲクーラーにすすのトラップ（捕集）能
力と、その燃焼によって上昇した排気ガスの温度を低下
させるための冷却能力を併せ持たせることにより、高い
ＮＯｘ浄化性能とエンジンの耐久信頼性の向上を得るこ
とを目的とするものである。[0004] The present invention solves the above-mentioned problems of the prior art, and increases the soot trapping (capturing) capability of the EGR cooler and the cooling capability for lowering the temperature of the exhaust gas raised by the combustion. An object of the present invention is to obtain a high NOx purification performance and an improvement in the durability reliability of the engine by having both of them.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めに、本発明では、排気ガスを吸気路側に還流させるＥ
ＧＲ通路に配設されるＥＧＲクーラーを、排気ガス中の
すすを捕集、燃焼しＮＯｘを浄化する触媒層と排気ガス
を冷却させるガス冷却層との２層から構成したことを特
徴とするものである。In order to solve the above-mentioned problems, according to the present invention, exhaust gas is recirculated to an intake passage side.
The EGR cooler provided in the GR passage is characterized by comprising two layers of a catalyst layer for collecting and burning soot in the exhaust gas to purify NOx and a gas cooling layer for cooling the exhaust gas. It is.
【０００６】また、ＥＧＲクーラーを形成する触媒層と
冷却層の２層の間に断熱層を介在せせて各層を良好に作
動させるように構成している。更に、ＥＧＲクーラー本
体の外側部に冷却フィンを設けることによって冷却効率
を上昇させるように構成している。In addition, a heat insulation layer is interposed between the catalyst layer and the cooling layer forming the EGR cooler so that each layer can be operated well. Further, the cooling efficiency is increased by providing cooling fins on the outer side of the EGR cooler main body.
【０００７】上記の構成によれば、還流される排気ガス
中の残留酸素と捕集されたすすとの燃焼により触媒層で
のＮＯｘ浄化が促進される。また、すすの捕集、燃焼に
より、還流される排気ガス中のすす量が低減された吸気
がエンジンに供給されることから、その内部機構の摩耗
を防止してエンジンの寿命を延長することができる。[0007] According to the above configuration, the combustion of the residual oxygen in the recirculated exhaust gas and the collected soot promotes NOx purification in the catalyst layer. In addition, since the intake of soot with reduced soot in the recirculated exhaust gas is supplied to the engine by the collection and combustion of soot, it is possible to prevent wear of the internal mechanism and extend the life of the engine. it can.
【０００８】[0008]
【発明の実施の形態】次に、添付図面を参照して本発明
の実施の形態を説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【０００９】図１において、ディーゼルエンジン１の吸
気マニホルドに、エアクリーナ３を設けた吸気路２を接
続すると共に排気マニホルドに排気路４を接続し、この
排気路４の途中に触媒コンバータ５を設けている。In FIG. 1, an intake manifold 2 having an air cleaner 3 is connected to an intake manifold of a diesel engine 1 and an exhaust passage 4 is connected to an exhaust manifold. I have.
【００１０】６は排気路４の途中から分岐され、前記エ
アクリーナ３より後方の吸気路２の途中に接続され、一
部の排気ガスＧを吸気路２側に還流させる排気還流通
路、即ちＥＧＲ通路である。このＥＧＲ通路６の途中に
は、ＥＧＲ弁７、ＥＧＲクーラー８が夫々設けられてい
る。An exhaust gas recirculation passage 6 branches off from the middle of the exhaust passage 4 and is connected to a part of the intake passage 2 behind the air cleaner 3 to recirculate a part of exhaust gas G to the intake passage 2 side, that is, an EGR passage. It is. In the middle of the EGR passage 6, an EGR valve 7 and an EGR cooler 8 are provided, respectively.
【００１１】ＥＧＲクーラー８は図２、図３、図４に示
すように、本体８１がすすを捕集するとともに、ＮＯｘ
を浄化させるための焼結合金またはセラミックフォーム
に、Ｐｔ，Ｐｄ等の酸化活性を有する触媒を金属薄膜と
してコーティングした触媒層８２と、排気ガスＧを冷却
させるガス冷却層８３の２層から構成されている。そし
てこの２層の間には耐熱性断熱材からなる断熱層８４が
設けられている。As shown in FIGS. 2, 3 and 4, the EGR cooler 8 has a main body 81 that collects soot and a NOx.
A catalyst layer 82 in which a catalyst having an oxidizing activity such as Pt or Pd is coated as a metal thin film on a sintered alloy or ceramic foam for purifying the exhaust gas, and a gas cooling layer 83 for cooling the exhaust gas G. ing. A heat insulating layer 84 made of a heat-resistant heat insulating material is provided between the two layers.
【００１２】また、本体８１の一端には、排気ガスＧの
流入口８５と流出口８６が夫々設けられており、他端に
は、触媒層８２からの排気ガスＧを冷却層８３へ円滑に
導入するように外周部を湾曲状に形成された中間集合部
８７が設けられている。At one end of the main body 81, an inlet 85 and an outlet 86 for the exhaust gas G are provided, and at the other end, the exhaust gas G from the catalyst layer 82 is smoothly fed to the cooling layer 83. An intermediate assembly portion 87 having an outer peripheral portion formed into a curved shape so as to be introduced is provided.
【００１３】前記冷却層８３は、図３に示すように複数
の偏平に形成した管体を配置した排気ガス流路８３ａが
配設されており、それらの排気ガス流路８３ａの外周部
に冷却媒体としてのエンジン１の冷却水Ｗが導入される
冷却部８３ｂが形成されている。なお、排気ガス流路８
３ａは耐腐食性に富むＳＵＳ材で構成されるのが望まし
い。As shown in FIG. 3, the cooling layer 83 is provided with an exhaust gas passage 83a in which a plurality of flatly formed pipes are arranged, and a cooling layer is provided on the outer periphery of the exhaust gas passage 83a. A cooling portion 83b into which the cooling water W of the engine 1 as a medium is introduced is formed. The exhaust gas passage 8
3a is desirably made of a SUS material having high corrosion resistance.
【００１４】また、前記本体８１には冷却層８３へエン
ジン１からの冷却水Ｗを導入する流入口８３ｃと、この
冷却部８３から昇温した冷却水Ｗをエンジン１に戻す流
出口８３ｄが夫々設けられている。さらに、前記本体８
１の冷却層８３側の外側には冷却フィン８８を一体成形
により形成して空気冷却の効果が向上するように構成し
ている。The main body 81 has an inlet 83c for introducing cooling water W from the engine 1 into the cooling layer 83 and an outlet 83d for returning the cooling water W heated from the cooling section 83 to the engine 1. Is provided. Further, the main body 8
A cooling fin 88 is formed outside the first cooling layer 83 by integral molding to improve the air cooling effect.
【００１５】上述のように構成された本発明のＥＧＲク
ーラー８においては、還流される排気ガスＧは先づ流入
口８５より触媒層８２内に流入し、これによって排気ガ
スＧ中のすすが捕集され、更にその酸化反応によって排
気ガスＧ中の残留酸素によりそのすすは燃焼され、ＮＯ
ｘ浄化が促進される。In the EGR cooler 8 of the present invention configured as described above, the recirculated exhaust gas G first flows into the catalyst layer 82 from the inflow port 85, so that the soot in the exhaust gas G is captured. And the soot is combusted by the residual oxygen in the exhaust gas G by the oxidation reaction.
x Purification is promoted.
【００１６】すすの燃焼により温度の上昇した触媒層８
２からの排気ガスＧは、中間集合部８７を経由して隣接
して配置した冷却層８３の排気ガス流路８３ａ内に導入
され、この排気ガス流路８３ａの外部の冷却水Ｗによっ
て冷却され、そしてＥＧＲ制御弁７を経由して吸気路２
へ還流される。このように、本発明のＥＧＲクーラー８
では、排気ガスＧ中の残留酸素と捕集されたすすとの燃
焼により、ＮＯｘ浄化が促進され、ＮＯｘ低減が図られ
る。The catalyst layer 8 whose temperature has increased due to soot combustion.
The exhaust gas G from 2 is introduced into the exhaust gas passage 83a of the cooling layer 83 disposed adjacent via the intermediate collecting portion 87, and is cooled by the cooling water W outside the exhaust gas passage 83a. And the intake passage 2 via the EGR control valve 7
Refluxed to Thus, the EGR cooler 8 of the present invention
Then, combustion of the residual oxygen in the exhaust gas G and the collected soot promotes NOx purification and reduces NOx.
【００１７】また、すすの捕集、燃焼により、還流され
る排気ガスＧ中のすす量が低減されてエンジン内部のピ
ストンリング、シリンダライナー、バルブシート面等の
摩耗が防止される。Further, the amount of soot in the recirculated exhaust gas G is reduced by soot collection and combustion, and wear of the piston ring, cylinder liner, valve seat surface and the like inside the engine is prevented.
【００１８】また、ＣＯ2 濃度が増加するため、排気ガ
ス中の不活性成分が増えることで、実際の排気ガス還流
率（ＥＧＲ率）が増加し、テールパイプエミッションが
低下できる。さらに、必要還流排気ガス量が少なくなる
ことで、必要放熱容量が少なくなり、ＥＧＲクーラー自
体が小さくできる。Further, since the CO 2 concentration increases, the amount of inert components in the exhaust gas increases, so that the actual exhaust gas recirculation rate (EGR rate) increases and the tail pipe emission can be reduced. Further, since the required amount of recirculated exhaust gas is reduced, the required heat radiation capacity is reduced, and the EGR cooler itself can be reduced.
【００１９】また、ＥＧＲクーラー本体８１内を触媒層
８２と冷却層８３とに断熱層８４を介して２分割し、隣
合わせに配設したことにより、排気ガス浄化機能を備え
ながら、コンパクトな構造とすることができた。さら
に、本体８１の冷却層８３側にに冷却フィン８８を設け
たことで、ＥＧＲクーラーの冷却効率を向上できる。The inside of the EGR cooler body 81 is divided into two parts, a catalyst layer 82 and a cooling layer 83, via a heat insulating layer 84, and is disposed adjacent to each other. We were able to. Furthermore, by providing the cooling fins 88 on the cooling layer 83 side of the main body 81, the cooling efficiency of the EGR cooler can be improved.
【００２０】[0020]
【発明の効果】以上のように、本発明では、ＥＧＲクー
ラーを排気ガス中のすすを捕集、燃焼しＮＯｘを浄化す
る触媒層と排気ガスを冷却させるガス冷却層との２層か
ら構成したので、還流される排気ガス中の残留酸素と捕
集されたすすとの燃焼により触媒層でのＮＯｘ浄化が促
進され、ＮＯｘ低減が図られる。As described above, in the present invention, the EGR cooler is composed of two layers: a catalyst layer for collecting and burning soot in the exhaust gas to purify NOx and a gas cooling layer for cooling the exhaust gas. Therefore, the combustion of the residual oxygen in the recirculated exhaust gas and the collected soot promotes NOx purification in the catalyst layer, thereby reducing NOx.
【００２１】また、すすの捕集、燃焼により、還流され
る排気ガス中のすす量が低減され、エンジン内部のピス
トンリング、シリンダライナー、バルブシート面等の摩
耗が防止される。Further, the amount of soot in the recirculated exhaust gas is reduced by soot collection and combustion, and wear of the piston ring, cylinder liner, valve seat surface and the like inside the engine is prevented.
【００２２】また、ＣＯ2 濃度が増加するため、排気ガ
ス中の不活性成分が増えることで、実際の排気ガス還流
率（ＥＧＲ率）が増加しテールパイプエミッションが低
下できる。さらに、必要還流排気ガス量が少なくなるこ
とで、必要放熱容量が少なくなり、ＥＧＲクーラー自体
が小さくできる。Further, since the CO 2 concentration increases, the amount of inert components in the exhaust gas increases, so that the actual exhaust gas recirculation rate (EGR rate) increases and the tail pipe emission can be reduced. Further, since the required amount of recirculated exhaust gas is reduced, the required heat radiation capacity is reduced, and the EGR cooler itself can be reduced.
【００２３】また、ＥＧＲクーラー本体内を触媒層と冷
却層とに断熱層を介して２分割して配設したことによ
り、排気ガス浄化機能を備えながら、コンパクトな構造
とすることができる。さらに、冷却フィンを設けたこと
で、ＥＧＲクーラーの冷却効率の向上を図ることができ
る。Further, since the inside of the EGR cooler body is divided into two parts, a catalyst layer and a cooling layer, with a heat insulating layer interposed therebetween, a compact structure can be provided while having an exhaust gas purifying function. Further, by providing the cooling fins, the cooling efficiency of the EGR cooler can be improved.
【図１】本発明の実施の形態を示すエンジンの全体系統
図である。FIG. 1 is an overall system diagram of an engine showing an embodiment of the present invention.
【図２】同実施の形態のＥＧＲクーラーの要部破断して
示す平面図である。FIG. 2 is a plan view showing a main part of the EGR cooler of the embodiment in a cutaway manner.
【図３】同ＥＧＲクーラーの横断面図である。FIG. 3 is a cross-sectional view of the EGR cooler.
【図４】同ＥＧＲクーラーの外観斜視図である。FIG. 4 is an external perspective view of the EGR cooler.
１ エンジン ６ ＥＧＲ通路 ８ ＥＧＲクーラー ８１ 本体 ８２ 触媒層 ８３ 冷却層 ８４ 断熱層 ８８ 冷却フィン Reference Signs List 1 engine 6 EGR passage 8 EGR cooler 81 body 82 catalyst layer 83 cooling layer 84 heat insulating layer 88 cooling fin
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０１Ｎ 3/02 ３２１ Ｆ０１Ｎ 3/02 ３２１Ｈ 3/24 3/24 Ｓ Ｌ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F01N 3/02 321 F01N 3/02 321H 3/24 3/24 SL
Claims (3)
通路に配設されるＥＧＲクーラーを、排気ガス中のすす
を捕集、燃焼しＮＯｘを浄化する触媒層と排気ガスを冷
却させるガス冷却層との２層から構成したことを特徴と
する排気ガス浄化機能付きＥＧＲクーラー。An EGR system for recirculating exhaust gas to an intake passage.
An exhaust gas characterized in that the EGR cooler provided in the passage is composed of two layers: a catalyst layer for collecting and burning soot in the exhaust gas to purify NOx and a gas cooling layer for cooling the exhaust gas. EGR cooler with purification function.
却層との間に、断熱層を介設させたことを特徴とする排
気ガス浄化機能付きＥＧＲクーラー。2. The EGR cooler with an exhaust gas purifying function according to claim 1, wherein a heat insulating layer is provided between the catalyst layer and the cooling layer.
を配設した側のＥＧＲクーラーの本体の外側部に冷却フ
ィンを設けたことを特徴とする排気ガス浄化機能付きＥ
ＧＲクーラー。3. The E with exhaust gas purifying function according to claim 1, wherein cooling fins are provided on the outer side of the body of the EGR cooler on which the cooling layer is provided.
GR cooler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05264599A JP3937635B2 (en) | 1999-03-01 | 1999-03-01 | EGR cooler with exhaust gas purification function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05264599A JP3937635B2 (en) | 1999-03-01 | 1999-03-01 | EGR cooler with exhaust gas purification function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000249003A true JP2000249003A (en) | 2000-09-12 |
| JP3937635B2 JP3937635B2 (en) | 2007-06-27 |
Family
ID=12920587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05264599A Expired - Fee Related JP3937635B2 (en) | 1999-03-01 | 1999-03-01 | EGR cooler with exhaust gas purification function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3937635B2 (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040050267A (en) * | 2002-12-10 | 2004-06-16 | 현대자동차주식회사 | Exhaust gas reduction device |
| WO2005028848A1 (en) * | 2003-09-18 | 2005-03-31 | Behr Gmbh & Co. Kg | Exhaust-gas heat exchanger, in particular exhaust-gas cooler for exhaust gas recirculation in motor vehicles |
| JP2006125382A (en) * | 2004-09-28 | 2006-05-18 | Sadao Odajima | Engine device |
| WO2006100072A1 (en) | 2005-03-24 | 2006-09-28 | Behr Gmbh & Co. Kg | Exhaust gas heat exchanger, in particular an exhaust gas cooler for exhaust gas recirculation in a motor vehicle |
| WO2006100069A1 (en) * | 2005-03-24 | 2006-09-28 | Behr Gmbh & Co. Kg | Exhaust gas heat exchanger, in particular an exhaust gas cooler for exhaust gas recirculation in a motor vehicle |
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