JP4297067B2 - Exhaust gas recirculation device - Google Patents

Exhaust gas recirculation device Download PDF

Info

Publication number
JP4297067B2
JP4297067B2 JP2005073080A JP2005073080A JP4297067B2 JP 4297067 B2 JP4297067 B2 JP 4297067B2 JP 2005073080 A JP2005073080 A JP 2005073080A JP 2005073080 A JP2005073080 A JP 2005073080A JP 4297067 B2 JP4297067 B2 JP 4297067B2
Authority
JP
Japan
Prior art keywords
catalyst
exhaust
exhaust manifold
exhaust gas
peripheral surface
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 - Fee Related
Application number
JP2005073080A
Other languages
Japanese (ja)
Other versions
JP2006257905A (en
Inventor
忠司 戸田
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP2005073080A priority Critical patent/JP4297067B2/en
Priority to EP06005000A priority patent/EP1703116B1/en
Priority to CNB2006100574779A priority patent/CN100570148C/en
Publication of JP2006257905A publication Critical patent/JP2006257905A/en
Application granted granted Critical
Publication of JP4297067B2 publication Critical patent/JP4297067B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • 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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Silencers (AREA)

Description

本発明は内燃機関の排気還流装置に関する。   The present invention relates to an exhaust gas recirculation device for an internal combustion engine.

内燃機関の運転時に発生する排気中の窒素酸化物を低減させるべく、燃焼室内から排気通路へ排出された排気ガスを吸気通路に還流させることで、燃焼温度の上昇を抑制する排気還流（Exhaust Gas Recirculation ）装置（以下、ＥＧＲ装置と称する）が知られている。こうしたＥＧＲ装置を採用することにより、燃焼温度の上昇を抑制し、窒素酸化物の発生を抑えることができる反面、排気中に含まれる未燃の炭化水素の発生量が増加し、ＥＧＲ装置を構成する各装置に炭化水素が堆積することで同各装置が劣化してしまう。そこで、例えば特許文献１のように、炭化水素を酸化除去する触媒をＥＧＲ装置内に配設するものがある。
特開平１１−１２５１４８ Exhaust recirculation (Exhaust Gas) that suppresses the rise in combustion temperature by recirculating exhaust gas discharged from the combustion chamber to the exhaust passage to the intake passage to reduce nitrogen oxides generated during operation of the internal combustion engine Recirculation) devices (hereinafter referred to as EGR devices) are known. By adopting such an EGR device, it is possible to suppress the rise in combustion temperature and suppress the generation of nitrogen oxides, but the amount of unburned hydrocarbons contained in the exhaust increases, and the EGR device is configured. As the hydrocarbons accumulate on each device, the devices deteriorate. Therefore, for example, as disclosed in Patent Document 1, there is one in which a catalyst for oxidizing and removing hydrocarbons is provided in an EGR device.
JP-A-11-125148

ところが、冷間始動時などのように触媒の温度が低く同触媒が活性化されていない場合には、未燃の炭化水素を十分に酸化除去することができない。こうした問題に対して、例えば触媒を加熱するためのヒータを設けることにより同触媒の温度を上昇させる技術がある。しかしながらこの場合には、部品点数が増えることによって、ＥＧＲ装置の大型化やコストの増加といった新たな問題が生じることとなる。   However, when the temperature of the catalyst is low and the catalyst is not activated, such as during cold start, unburned hydrocarbons cannot be sufficiently oxidized and removed. For example, there is a technique for increasing the temperature of the catalyst by providing a heater for heating the catalyst. However, in this case, a new problem such as an increase in the size of the EGR device and an increase in cost occurs due to an increase in the number of parts.

本発明は、こうした実情に鑑みてなされたものであって、その目的は、簡易な構成によって触媒温度を速やかに上昇させることのできる排気還流装置を提供することにある。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide an exhaust gas recirculation apparatus capable of quickly raising the catalyst temperature with a simple configuration.

以下、上記目的を解決するための手段及びその作用効果について記載する。
請求項１に記載の発明は、内燃機関の排気を吸気通路に還流させる排気還流通路に炭化水素を酸化除去する触媒部を備える排気還流装置であって、前記触媒部は前記内燃機関の排気通路の外周面である、前記内燃機関の排気マニホルドの外周面に当接されてなることをその要旨とする。 Hereinafter, means for solving the above-described object and its operation and effects will be described.
The invention according to claim 1 is an exhaust gas recirculation device comprising a catalyst portion for oxidizing and removing hydrocarbons in an exhaust gas recirculation passage for recirculating exhaust gas of an internal combustion engine to an intake passage, wherein the catalyst portion is an exhaust passage of the internal combustion engine. The gist of this is that it is in contact with the outer peripheral surface of the exhaust manifold of the internal combustion engine, which is the outer peripheral surface of the internal combustion engine .

上記構成によれば、炭化水素を酸化除去する触媒部が内燃機関の排気通路の外周面に当接されている。このため触媒部は、燃焼室から排出される高温の排気によって加熱され高温となっている排気通路の外周面から熱を直接受けることとなる。したがって、簡易な構成によって触媒温度を速やかに上昇させることができる。
特に、触媒部が内燃機関の排気通路のうちで最も上流に位置する排気マニホルドの外周面に当接されている。換言すれば、排気通路のうちで最も高温となる部分に触媒部が当接されている。このため、触媒温度をより速やかに上昇させることができる。 According to the above configuration, the catalyst portion for oxidizing and removing hydrocarbons is in contact with the outer peripheral surface of the exhaust passage of the internal combustion engine. For this reason, the catalyst part receives heat directly from the outer peripheral surface of the exhaust passage which is heated by the high-temperature exhaust gas discharged from the combustion chamber and has a high temperature. Therefore, the catalyst temperature can be quickly raised with a simple configuration.
In particular, the catalyst portion is in contact with the outer peripheral surface of the exhaust manifold located most upstream in the exhaust passage of the internal combustion engine. In other words, the catalyst portion is in contact with the highest temperature portion of the exhaust passage. For this reason, a catalyst temperature can be raised more rapidly.

内燃機関の排気マニホルドの外周面に触媒部を当接させる場合には、排気マニホルドを構成する各支管が独立している部分に同触媒部を配設すると、触媒部のうちで排気マニホルドと当接する部分と当接しない部分とが生じてしまう。この場合、触媒部のうちで排気マニホルドに当接しない部分は当接する部分に比べて加熱されにくいため、触媒部全体を均一に加熱することが困難となる。   When the catalyst part is brought into contact with the outer peripheral surface of the exhaust manifold of the internal combustion engine, if the catalyst part is arranged in a part where each branch pipe constituting the exhaust manifold is independent, the catalyst part and the exhaust manifold are contacted with each other. The part which contacts and the part which does not contact will arise. In this case, the portion of the catalyst portion that does not come into contact with the exhaust manifold is less likely to be heated than the portion that comes into contact, so that it becomes difficult to uniformly heat the entire catalyst portion.

この点請求項２に記載の発明によれば、前記触媒部が前記排気マニホルドを構成する各支管が集合する集合部の外周面に当接されている。このため、触媒部が排気マニホルドに一様に当接するようになり、同触媒部全体を均一に加熱することができる。 According to the second aspect of the present invention, the catalyst portion is in contact with the outer peripheral surface of the collecting portion where the branch pipes constituting the exhaust manifold are gathered. For this reason, a catalyst part comes to contact | abut uniformly to an exhaust manifold, and the whole catalyst part can be heated uniformly.

具体的には、請求項３に記載の発明によるように、前記触媒部が、その長手方向が前記排気マニホルドを構成する各支管の延びる方向に略直交するように配設されてなるといった構成を採用することができる。 Specifically, according to the invention described in claim 3 , the catalyst portion is configured such that the longitudinal direction thereof is disposed so as to be substantially orthogonal to the extending direction of each branch pipe constituting the exhaust manifold. Can be adopted.

このような構成によれば、触媒部と排気マニホルドとの接触面積を大きくすることができるとともに、排気還流装置全体をコンパクトにまとめることができる。
請求項４に記載の発明は、請求項１〜３のいずれか一項に記載の発明において、前記触媒部が前記排気通路の外周面の上方部分に当接されてなることをその要旨とする。
上記構成によれば、排気通路の外周面の上方部分、すなわち排気通路の外周面のうちで最も放熱量が多い部分に触媒部が当接されているため、触媒温度を効率的に上昇させることができる。 According to such a configuration, the contact area between the catalyst portion and the exhaust manifold can be increased, and the entire exhaust gas recirculation device can be compactly integrated.
The gist of the invention according to claim 4 is that, in the invention according to any one of claims 1 to 3, the catalyst portion is in contact with an upper portion of the outer peripheral surface of the exhaust passage. .
According to the above configuration, since the catalyst portion is in contact with the upper part of the outer peripheral surface of the exhaust passage, that is, the portion with the largest heat radiation amount in the outer peripheral surface of the exhaust passage, the catalyst temperature can be increased efficiently. Can do.

以下、本発明の一実施形態にかかる排気還流装置１０（以下、ＥＧＲ装置と称する）について、図１，２を参照して説明する。
図１に示されるように排気通路２０は、排気マニホルド２２を備えて構成されている。 Hereinafter, an exhaust gas recirculation device 10 (hereinafter referred to as an EGR device) according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the exhaust passage 20 includes an exhaust manifold 22.

排気マニホルド２２は、支管２２ａ１〜２２ａ４からなる支管部２２ａおよび各支管２２ａ１〜２２ａ４の集合する集合部２２ｂとを備える多岐管であって、図示しない内燃機関の燃焼室から排気を排気通路２０の下流へと導くものである。本実施形態では排気マニホルド２２を鉄系材料によって形成している。排気マニホルド２２の下流位置には図示しないターボチャージャが接続されている。   The exhaust manifold 22 is a manifold provided with a branch pipe portion 22a composed of the branch pipes 22a1 to 22a4 and a collecting portion 22b where the branch pipes 22a1 to 22a4 are gathered. It leads to. In the present embodiment, the exhaust manifold 22 is formed of an iron-based material. A turbocharger (not shown) is connected to the downstream position of the exhaust manifold 22.

一方、ＥＧＲ装置１０は、図１に示されるように、排気還流通路（以下、ＥＧＲ通路と称する）１２、触媒部１４、および図示しないＥＧＲクーラ等を備えて構成されている。
ＥＧＲ通路１２の排気上流側の一端が排気マニホルド２２と連通されるとともに、同ＥＧＲ通路１２の排気下流側の他端が図示しない吸気通路と連通されることによって、排気マニホルド２２と吸気通路とが連通されている。 On the other hand, as shown in FIG. 1, the EGR device 10 includes an exhaust gas recirculation passage (hereinafter referred to as an EGR passage) 12, a catalyst unit 14, an EGR cooler (not shown), and the like.
One end on the exhaust upstream side of the EGR passage 12 communicates with the exhaust manifold 22, and the other end on the exhaust downstream side of the EGR passage 12 communicates with an intake passage (not shown), whereby the exhaust manifold 22 and the intake passage are connected. It is communicated.

ＥＧＲ通路１２には、燃焼室から排出される未燃の炭化水素を酸化除去するための触媒部１４が備えられている。図１に示されるように、触媒部１４はＥＧＲ通路１２の軸方向（矢印Ｃ方向）に長い円筒形状をしており、その長手方向（矢印Ｃ方向）が排気マニホルド２２の各支管２２ａ１〜２２ａ４の延びる方向（矢印Ｍ方向）に直交する向きで排気マニホルド２２の集合部２２ｂの外周面上に当接されている。触媒部１４は図示しない貴金属触媒を内包する円筒形状のカバー１４ａ、同カバー１４ａを排気マニホルドに固定するためのブラケット１４ｂ、および同ブラケット１４ｂを排気マニホルド２２に固定するためのボルト１４ｃを備えている。排気マニホルド２２に形成された図示しないボルト穴にボルト１４ｃを締め付けることで、カバー１４ａはブラケット１４ｂを介して排気マニホルド２２に固定されている。   The EGR passage 12 is provided with a catalyst portion 14 for oxidizing and removing unburned hydrocarbons discharged from the combustion chamber. As shown in FIG. 1, the catalyst portion 14 has a cylindrical shape that is long in the axial direction (arrow C direction) of the EGR passage 12, and the longitudinal direction (arrow C direction) is the branch pipes 22 a 1 to 22 a 4 of the exhaust manifold 22. Is in contact with the outer peripheral surface of the collective portion 22b of the exhaust manifold 22 in a direction orthogonal to the direction in which the cylinder extends (the direction of the arrow M). The catalyst unit 14 includes a cylindrical cover 14a containing a precious metal catalyst (not shown), a bracket 14b for fixing the cover 14a to the exhaust manifold, and a bolt 14c for fixing the bracket 14b to the exhaust manifold 22. . The cover 14a is fixed to the exhaust manifold 22 via the bracket 14b by tightening a bolt 14c in a bolt hole (not shown) formed in the exhaust manifold 22.

具体的には、図２に示されるように、ブラケット１４ｂの形状は、円筒形状となっているカバー１４ａの下方部分の形状に合わせて半円形の凹型形状となっている。こうした構成によって、触媒部１４のカバー１４ａは排気マニホルド２２の外周面の上方部分に当接された状態にて取り付けられている。これら触媒部１４を構成するカバー１４ａ、ブラケット１４ｂ、ボルト１４ｃ、およびＥＧＲ通路１２はいずれも鉄系材料によって形成されている。本実施形態では、触媒部１４内に配設される触媒として高温になると活性化されて炭化水素の酸化除去性能が向上する貴金属触媒を採用している。   Specifically, as shown in FIG. 2, the shape of the bracket 14 b is a semicircular concave shape in accordance with the shape of the lower portion of the cover 14 a that is cylindrical. With this configuration, the cover 14 a of the catalyst unit 14 is attached in contact with the upper part of the outer peripheral surface of the exhaust manifold 22. All of the cover 14a, the bracket 14b, the bolt 14c, and the EGR passage 12 constituting the catalyst unit 14 are formed of an iron-based material. In this embodiment, a noble metal catalyst that is activated at a high temperature and improves the oxidation removal performance of hydrocarbons is employed as the catalyst disposed in the catalyst unit 14.

次に本発明にかかる排気還流装置１０の作用について説明する。
内燃機関の運転が開始されると、燃焼室から排出される高温の排気が排気マニホルド２２へと送り出されるようになる。高温の排気によって加熱されることにより排気マニホルド２２の温度は上昇する。特に排気マニホルド２２内での熱移動によって排気マニホルド２２の外周面のうちで上方部分の放熱量がその他の部分の放熱量よりも大きくなる。ここで、触媒部１４と排気マニホルド２２の外周面の上方部分とが当接しているため、触媒部１４の温度も排気マニホルド２２の温度が上昇するにつれて速やかに上昇することとなる。 Next, the operation of the exhaust gas recirculation device 10 according to the present invention will be described.
When the operation of the internal combustion engine is started, high-temperature exhaust discharged from the combustion chamber is sent to the exhaust manifold 22. The temperature of the exhaust manifold 22 rises by being heated by the high-temperature exhaust. In particular, due to heat transfer in the exhaust manifold 22, the heat radiation amount in the upper portion of the outer peripheral surface of the exhaust manifold 22 becomes larger than the heat radiation amount in the other portions. Here, since the catalyst part 14 and the upper part of the outer peripheral surface of the exhaust manifold 22 are in contact with each other, the temperature of the catalyst part 14 also rises rapidly as the temperature of the exhaust manifold 22 rises.

以上説明した本実施形態によれば、以下の効果が得られるようになる。
（１）図１，２に示されるように、炭化水素を酸化除去する触媒部１４のカバー１４ａが内燃機関の排気マニホルド２２の外周面に当接されている。このため、燃焼室から排出される高温の排気によって加熱され高温となる排気通路のうちで最も高温となる部分である排気マニホルド２２の外周面からカバー１４ａが熱を直接受けることとなる。したがって、簡易な構成によって触媒温度を速やかに上昇させることができる。 According to the embodiment described above, the following effects can be obtained.
(1) As shown in FIGS. 1 and 2, the cover 14 a of the catalyst unit 14 for oxidizing and removing hydrocarbons is in contact with the outer peripheral surface of the exhaust manifold 22 of the internal combustion engine. For this reason, the cover 14a receives heat directly from the outer peripheral surface of the exhaust manifold 22 which is the highest temperature portion of the exhaust passage heated by the high temperature exhaust gas discharged from the combustion chamber. Therefore, the catalyst temperature can be quickly raised with a simple configuration.

（２）排気マニホルド２２の外周面の上方部分、すなわち排気マニホルド２２の外周面のうちで最も放熱量が多い部分に触媒部１４が取り付けられているため、触媒温度を効果的に上昇させることができる。   (2) Since the catalyst part 14 is attached to the upper part of the outer peripheral surface of the exhaust manifold 22, that is, the part of the outer peripheral surface of the exhaust manifold 22 that has the largest amount of heat release, the catalyst temperature can be effectively increased. it can.

（３）内燃機関の排気マニホルドの外周面に触媒部を当接させる場合には、排気マニホルドを構成する各支管が独立している部分に同触媒部を配設すると、触媒部のうちで排気マニホルドと当接する部分と当接しない部分とが生じてしまう。この場合、触媒部のうちで排気マニホルドに当接しない部分は当接する部分に比べて加熱されにくいため、触媒部全体を均一に加熱することが困難となる。   (3) When the catalyst portion is brought into contact with the outer peripheral surface of the exhaust manifold of the internal combustion engine, if the catalyst portion is disposed in a portion where each branch pipe constituting the exhaust manifold is independent, the exhaust gas is exhausted in the catalyst portion. There will be a portion that contacts the manifold and a portion that does not contact the manifold. In this case, the portion of the catalyst portion that does not come into contact with the exhaust manifold is less likely to be heated than the portion that comes into contact, so that it becomes difficult to uniformly heat the entire catalyst portion.

この点本実施形態によれば、図１，２に示されるように、触媒部１４が排気マニホルド２２を構成する各支管２２ａ１〜２２ａ４が集合する集合部２２ｂの外周面に当接されている。このため、触媒部１４が排気マニホルド２２に一様に当接するようになり、同触媒部１４全体を均一に加熱することができる。   In this regard, according to this embodiment, as shown in FIGS. 1 and 2, the catalyst portion 14 is in contact with the outer peripheral surface of the collecting portion 22 b where the branch pipes 22 a 1 to 22 a 4 constituting the exhaust manifold 22 are gathered. For this reason, the catalyst part 14 comes to contact | abut uniformly to the exhaust manifold 22, and the same catalyst part 14 whole can be heated uniformly.

（４）触媒部１４が、その長手方向が各支管２２ａ１〜２２ａ４の延びる方向に略直交するように配設されている。このような構成によれば、触媒部１４と排気マニホルド２２との接触面積を大きくすることができるとともに、排気還流装置１０全体をコンパクトにまとめることができる。   (4) The catalyst part 14 is arrange | positioned so that the longitudinal direction may be substantially orthogonal to the direction where each branch pipe 22a1-22a4 is extended. According to such a configuration, the contact area between the catalyst unit 14 and the exhaust manifold 22 can be increased, and the entire exhaust gas recirculation device 10 can be compactly integrated.

（５）内燃機関の運転時において高温となる排気マニホルド２２の外周面に、同じく高温となる触媒部１４が当接されている。このため、これら高温となる部位が一箇所に集約されることにより、周辺部品に対する熱害対策、例えば熱遮蔽版を設けるなどの対策を簡易なものとすることができる。   (5) The catalyst portion 14 that also has a high temperature is in contact with the outer peripheral surface of the exhaust manifold 22 that has a high temperature during operation of the internal combustion engine. For this reason, by gathering these high temperature parts in one place, it is possible to simplify measures against heat damage to peripheral components, for example, providing a heat shielding plate.

なお、上記実施の形態は、以下のように変更して実施することもできる。
・上記触媒部１４の取り付け態様は、先の実施形態において例示した態様、すなわちカバー１４ａがブラケット１４ｂを介して排気マニホルド２２に固定されるものに限られない。例えば、カバー１４ａに取り付けられたブラケット１４ｂをシリンダヘッド等の排気マニホルド２２以外の部位に固定することで、ブラケットを介すことなくカバー１４ａが排気マニホルド２２の外周面に当接するようにしてもよい。この場合、排気マニホルド２２の外周面からカバー１４ａ内の触媒への熱の移動がより直接的に行われることで同触媒温度をより速やかに上昇させることができる。 In addition, the said embodiment can also be changed and implemented as follows.
-The attachment aspect of the said catalyst part 14 is not restricted to the aspect illustrated in previous embodiment, ie, the cover 14a being fixed to the exhaust manifold 22 via the bracket 14b. For example, by fixing the bracket 14b attached to the cover 14a to a portion other than the exhaust manifold 22 such as a cylinder head, the cover 14a may be brought into contact with the outer peripheral surface of the exhaust manifold 22 without using the bracket. . In this case, heat transfer from the outer peripheral surface of the exhaust manifold 22 to the catalyst in the cover 14a is more directly performed, so that the catalyst temperature can be increased more quickly.

・上記触媒部１４の取り付け方向は、先の実施形態において例示した方向、すなわち触媒部１４が、その長手方向が各支管２２ａ１〜２２ａ４の延びる方向に略直交するように配設されてなるものに限られない。例えば触媒部１４が、その長手方向が各支管２２ａ１〜２２ａ４の延びる方向に沿って配設されてもよい。   The mounting direction of the catalyst part 14 is the direction exemplified in the previous embodiment, that is, the catalyst part 14 is arranged so that the longitudinal direction thereof is substantially orthogonal to the extending direction of the branch pipes 22a1 to 22a4. Not limited. For example, the catalyst part 14 may be arrange | positioned along the direction where the longitudinal direction extends each branch pipe 22a1-22a4.

・上記触媒部１４の取り付け位置は、先の実施形態において例示した位置、すなわち排気マニホルド２２を構成する各支管２２ａ１〜２２ａ４の集合する集合部２２ｂに限られない。例えば図３に示されるように、上記集合部２２ｂよりも排気の上流であって排気マニホルド２２Ａを構成する各支管２２ａ１〜２２ａ４がそれぞれ独立している部分に触媒部１４を取り付けてもよい。また図４に示されるように、触媒部１４の一部が排気マニホルド２２Ｂの外周面の上方部分から外れているものであってもよい。これらの場合も、排気マニホルド２２Ａ，２２Ｂと当接している部分を通じて触媒温度を上昇させることはできる。   -The attachment position of the catalyst part 14 is not limited to the position illustrated in the previous embodiment, that is, the aggregate part 22b where the branch pipes 22a1 to 22a4 constituting the exhaust manifold 22 gather. For example, as shown in FIG. 3, the catalyst unit 14 may be attached to a portion where the branch pipes 22a1 to 22a4 constituting the exhaust manifold 22A are independent of each other upstream of the collecting portion 22b. Further, as shown in FIG. 4, a part of the catalyst portion 14 may be detached from the upper portion of the outer peripheral surface of the exhaust manifold 22 </ b> B. Also in these cases, the catalyst temperature can be raised through the portions in contact with the exhaust manifolds 22A and 22B.

・上記触媒部１４の取り付け位置は、先の実施形態において例示した位置、すなわち排気マニホルド２２の外周面の上方部分に限られない。触媒部１４を取り付ける位置は、内燃機関のレイアウト等に応じて以下のように変更してもよい。例えば図５に示されるように、触媒部１４を排気マニホルド２２Ｃの外周面の下方部分に当接するように取り付けてもよい。また図６に示されるように、触媒部１４を排気マニホルド２２Ｄの外周面の側方部分に当接するように取り付けてもよい。触媒部１４の取り付け位置は、排気マニホルド２２から触媒部１４が受ける熱量の大きさや、内燃機関のレイアウト上の制約等を考慮して排気マニホルドの外周面のうちで最適な位置を採用することが望ましい。   The attachment position of the catalyst unit 14 is not limited to the position illustrated in the previous embodiment, that is, the upper portion of the outer peripheral surface of the exhaust manifold 22. The position where the catalyst unit 14 is attached may be changed as follows according to the layout of the internal combustion engine or the like. For example, as shown in FIG. 5, the catalyst unit 14 may be attached so as to contact the lower part of the outer peripheral surface of the exhaust manifold 22 </ b> C. Further, as shown in FIG. 6, the catalyst portion 14 may be attached so as to abut on the side portion of the outer peripheral surface of the exhaust manifold 22 </ b> D. For the mounting position of the catalyst unit 14, it is possible to adopt an optimal position on the outer peripheral surface of the exhaust manifold in consideration of the amount of heat received by the catalyst unit 14 from the exhaust manifold 22, restrictions on the layout of the internal combustion engine, and the like. desirable.

・上記触媒部１４の取り付け位置は、先の実施形態において例示した位置、すなわち排気マニホルド２２の外周面に限られない。例えば、排気通路２０のうち排気マニホルド以外の部分に取り付けてもよい。要するに、触媒部１４が内燃機関の排気通路２０の外周面に当接されてなるものであればよい。   The attachment position of the catalyst unit 14 is not limited to the position illustrated in the previous embodiment, that is, the outer peripheral surface of the exhaust manifold 22. For example, the exhaust passage 20 may be attached to a portion other than the exhaust manifold. In short, what is necessary is just to make the catalyst part 14 contact | abut to the outer peripheral surface of the exhaust passage 20 of an internal combustion engine.

本発明にかかる排気還流装置の平面図。The top view of the exhaust gas recirculation apparatus concerning this invention. 図１のＡ方向から見た排気還流装置の側面図。The side view of the exhaust gas recirculation apparatus seen from the A direction of FIG. 本発明にかかる排気還流装置の変形例を示す平面図。The top view which shows the modification of the exhaust gas recirculation apparatus concerning this invention. 本発明にかかる排気還流装置の他の変形例を示す平面図。The top view which shows the other modification of the exhaust gas recirculation apparatus concerning this invention. 本発明にかかる排気還流装置の他の変形例を示す側面図。The side view which shows the other modification of the exhaust gas recirculation apparatus concerning this invention. 本発明にかかる排気還流装置の他の変形例を示す側面図。The side view which shows the other modification of the exhaust gas recirculation apparatus concerning this invention.

符号の説明Explanation of symbols

１０…排気還流装置、１２，１２Ａ，１２Ｂ，１２Ｃ，１２Ｄ…排気還流通路、１４…触媒部、１４ａ…カバー、１４ｂ…ブラケット、１４ｃ…ボルト、２０…排気通路、２２，２２Ａ，２２Ｂ，２２Ｃ，２２Ｄ…排気マニホルド、２２ａ…支管部、２２ａ１，２２ａ２，２２ａ３，２２ａ４…支管、２２ｂ…集合部 DESCRIPTION OF SYMBOLS 10 ... Exhaust gas recirculation device, 12, 12A, 12B, 12C, 12D ... Exhaust gas recirculation passage, 14 ... Catalyst part, 14a ... Cover, 14b ... Bracket, 14c ... Bolt, 20 ... Exhaust passage, 22, 22A, 22B, 22C, 22D ... Exhaust manifold, 22a ... Branch pipe part, 22a1, 22a2, 22a3, 22a4 ... Branch pipe, 22b ... Collecting part

Claims (4)

内燃機関の排気を吸気通路に還流させる排気還流通路に炭化水素を酸化除去する触媒部を備える排気還流装置であって、
前記触媒部は前記内燃機関の排気通路の外周面である、前記内燃機関の排気マニホルドの外周面に当接されてなる
ことを特徴とする排気還流装置。 An exhaust gas recirculation device comprising a catalyst portion for oxidizing and removing hydrocarbons in an exhaust gas recirculation passage for recirculating exhaust gas of an internal combustion engine to an intake passage,
The exhaust gas recirculation apparatus, wherein the catalyst portion is in contact with an outer peripheral surface of an exhaust manifold of the internal combustion engine, which is an outer peripheral surface of an exhaust passage of the internal combustion engine . 前記触媒部は前記排気マニホルドを構成する各支管が集合する集合部の外周面に当接されてなる請求項１に記載の排気還流装置。  2. The exhaust gas recirculation apparatus according to claim 1, wherein the catalyst portion is in contact with an outer peripheral surface of a collecting portion where the branch pipes constituting the exhaust manifold gather. 前記触媒部は、その長手方向が前記排気マニホルドを構成する各支管の延びる方向に略直交するように配設されてなる請求項１または２に記載の排気還流装置。  3. The exhaust gas recirculation apparatus according to claim 1, wherein the catalyst portion is disposed so that a longitudinal direction thereof is substantially orthogonal to a direction in which each branch pipe constituting the exhaust manifold extends. 前記触媒部は前記排気通路の外周面の上方部分に当接されてなる請求項１〜３のいずれか一項に記載の排気還流装置。  The exhaust gas recirculation apparatus according to any one of claims 1 to 3, wherein the catalyst unit is in contact with an upper portion of an outer peripheral surface of the exhaust passage.
JP2005073080A 2005-03-15 2005-03-15 Exhaust gas recirculation device Expired - Fee Related JP4297067B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2005073080A JP4297067B2 (en) 2005-03-15 2005-03-15 Exhaust gas recirculation device
EP06005000A EP1703116B1 (en) 2005-03-15 2006-03-10 Exhaust gas recirculation unit for internal combustion engine
CNB2006100574779A CN100570148C (en) 2005-03-15 2006-03-15 The exhaust gas re-circulation apparatus that is used for internal-combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005073080A JP4297067B2 (en) 2005-03-15 2005-03-15 Exhaust gas recirculation device

Publications (2)

Publication Number Publication Date
JP2006257905A JP2006257905A (en) 2006-09-28
JP4297067B2 true JP4297067B2 (en) 2009-07-15

Family

ID=36202488

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005073080A Expired - Fee Related JP4297067B2 (en) 2005-03-15 2005-03-15 Exhaust gas recirculation device

Country Status (3)

Country Link
EP (1) EP1703116B1 (en)
JP (1) JP4297067B2 (en)
CN (1) CN100570148C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5550813B2 (en) * 2008-01-10 2014-07-16 ダイハツ工業株式会社 Exhaust gas recirculation device in internal combustion engine
FR2935435B1 (en) * 2008-08-29 2012-10-05 Peugeot Citroen Automobiles Sa RECIRCULATION LOOP OF EXHAUST GAS.
US8196568B2 (en) 2009-06-16 2012-06-12 Ford Global Technologies, Llc Cold start gas component retention system in EGR circuit with recirculated gas control
JP5494510B2 (en) * 2011-01-31 2014-05-14 三菱自動車工業株式会社 Exhaust gas recirculation device
JP5278458B2 (en) * 2011-01-31 2013-09-04 三菱自動車工業株式会社 Exhaust gas recirculation device
FR3005997B1 (en) * 2013-05-22 2015-06-19 Peugeot Citroen Automobiles Sa MOTOR VEHICLE ENGINE WITH EXHAUST GAS RECIRCULATION WITH IMPROVED COOLING
CN111170273B (en) * 2020-03-03 2023-08-15 大连海事大学 Combined cooling, heating and power supply system and power supply method based on ammonia energy ship
JP7400693B2 (en) * 2020-10-28 2023-12-19 マツダ株式会社 Engine exhaust circulation system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06100158B2 (en) * 1987-01-30 1994-12-12 三菱自動車工業株式会社 Exhaust gas recirculation system with filter for internal combustion engine with supercharger
JP3307502B2 (en) * 1993-07-06 2002-07-24 株式会社日本自動車部品総合研究所 Exhaust gas purification device
US5701736A (en) * 1994-12-19 1997-12-30 Nippon Soken, Inc. Apparatus for purifying exhaust gas
JPH11125148A (en) * 1997-10-23 1999-05-11 Mitsubishi Motors Corp Exhaust gas recirculation device
SE519922C2 (en) * 1998-12-07 2003-04-29 Stt Emtec Ab Device and process for exhaust purification and use of the device
JP3988028B2 (en) * 2002-01-28 2007-10-10 三菱自動車工業株式会社 EGR device for engine
JP2005073080A (en) 2003-08-26 2005-03-17 Nec Access Technica Ltd Foldable cellular phone

Also Published As

Publication number Publication date
EP1703116A2 (en) 2006-09-20
CN1834440A (en) 2006-09-20
JP2006257905A (en) 2006-09-28
EP1703116B1 (en) 2012-02-15
EP1703116A3 (en) 2007-06-27
CN100570148C (en) 2009-12-16

Similar Documents

Publication Publication Date Title
JP4297067B2 (en) Exhaust gas recirculation device
JP4709906B2 (en) Exhaust gas aftertreatment device
JP5985647B2 (en) Exhaust treatment device having an integral attachment
US20080092533A1 (en) Exhaust System for an Engine
JP2008169707A (en) Exhaust system of outboard motor
JP5404695B2 (en) Exhaust gas purification device layout structure for engine-driven work machines
US10500945B2 (en) Exhaust gas cleaning apparatus
JP2003214261A (en) Egr device for engine
US10526043B2 (en) Motorcycle exhaust with catalytic converter
JP2008285997A (en) Exhaust gas treatment device of engine
JP5202140B2 (en) Exhaust heat insulation cooling system
JP7024639B2 (en) Exhaust structure of internal combustion engine
SE519909C2 (en) Device for catalytic treatment of a gas flow
JP2003028008A (en) Egr device of internal combustion engine
JP2011074792A (en) Internal combustion engine
JP2007278156A (en) Exhaust device for engine
JP2007092706A (en) Engine
JP4769314B2 (en) Exhaust purification device for horizontal V bank type internal combustion engine
JP6979593B2 (en) engine
JP7028586B2 (en) Exhaust gas aftertreatment method and exhaust pipe of diesel engine
JP5623265B2 (en) Exhaust pipe connection structure
JP5118231B2 (en) Internal combustion engine structure
JP2012215112A (en) Engine
CN106401717B (en) Exhaust after treatment system
JP2008111374A (en) Egr gas recirculating device of engine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070808

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20080818

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080826

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20081216

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090121

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20090226

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20090324

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20090406

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120424

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120424

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130424

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140424

Year of fee payment: 5

LAPS Cancellation because of no payment of annual fees