JP2002309930A - Catalyst integral-type dual exhaust manifold - Google Patents
Catalyst integral-type dual exhaust manifoldInfo
- Publication number
- JP2002309930A JP2002309930A JP2001110775A JP2001110775A JP2002309930A JP 2002309930 A JP2002309930 A JP 2002309930A JP 2001110775 A JP2001110775 A JP 2001110775A JP 2001110775 A JP2001110775 A JP 2001110775A JP 2002309930 A JP2002309930 A JP 2002309930A
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- Prior art keywords
- catalyst
- upstream
- downstream
- dual exhaust
- exhaust manifold
- Prior art date
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- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、デュアル排気系を
構成する各排気系毎に触媒容器が設けられる触媒一体型
デュアルエキゾーストマニホールドに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst-integrated dual exhaust manifold in which a catalyst container is provided for each exhaust system constituting a dual exhaust system.
【０００２】[0002]
【従来の技術】触媒の活性を早期化するために、内燃機
関の排気ポートに近い場所に触媒を配置する近接触媒が
採用されるようになってきている。近接触媒では、温度
が高い状態のまま排気ガスが触媒に送られてコールド時
の触媒の昇温を促進することができ、活性を早期化して
排気ガス性能を向上させることができる。2. Description of the Related Art In order to accelerate the activity of a catalyst, a proximity catalyst in which a catalyst is disposed near an exhaust port of an internal combustion engine has been adopted. In the proximity catalyst, the exhaust gas is sent to the catalyst while the temperature is high, and the temperature rise of the catalyst at the time of cold can be promoted, the activity can be accelerated, and the exhaust gas performance can be improved.
【０００３】さらに、デュアル排気系を構成する各排気
系毎に触媒容器が設けられる触媒一体型デュアルエキゾ
ーストマニホールドも種々提案されている（例えば、特
開2000-18032等参照）。各排気系毎に触媒を設けること
で、排気干渉が抑制されて中低速トルクを向上させるこ
とができ、エンジン性能の向上が図れると同時に、触媒
一体型デュアルエキゾーストマニホールドの触媒容器を
内燃機関の排気ポートに近い場所に配置することで、排
気ガス性能も向上させることができ、排気ガス性能とエ
ンジン性能の両立を図ることが可能になると考えられて
いる。Further, various catalyst-integrated dual exhaust manifolds in which a catalyst container is provided for each exhaust system constituting a dual exhaust system have been proposed (for example, see Japanese Patent Application Laid-Open No. 2000-18032). By providing a catalyst for each exhaust system, exhaust interference can be suppressed and medium-low speed torque can be improved, engine performance can be improved, and at the same time, the catalyst container of the catalyst-integrated dual exhaust manifold can be used for exhaust gas from the internal combustion engine. It is considered that the exhaust gas performance can be improved by arranging it near the port, and it is possible to achieve both exhaust gas performance and engine performance.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、実際に
は、触媒一体型デュアルエキゾーストマニホールドの触
媒容器を内燃機関の排気ポートに近い場所に配置した場
合、例えば、４気筒エンジンでは一つの触媒容器の触媒
には２気筒分の排気ガスしか送られず、排気ガス流量が
減少してしまう。このため、触媒の昇温が遅くなりコー
ルド時に排気ガス性能が悪化する虞があった。触媒の昇
温を促進するために触媒容量を小さくすることも考えら
れるが、触媒容量を小さくすると、触媒の熱劣化が進み
易くなり耐久性能の点で問題が生じてしまう。また、デ
ュアル排気系を構成する排気系の間において触媒に流入
する排気ガス温度に差が生じるような場合、例えば、レ
イアウト上一部の排気管を長くする必要がある場合、流
入温度が低い方の排気系（排気管が長い側）の触媒の昇
温が遅くなってしまう問題が生じてしまう。However, in practice, when the catalyst container of the catalyst-integrated dual exhaust manifold is arranged near the exhaust port of the internal combustion engine, for example, in a four-cylinder engine, the catalyst of one catalyst container is used. , Only exhaust gas for two cylinders is sent, and the exhaust gas flow rate decreases. For this reason, there is a concern that the temperature rise of the catalyst is delayed and the exhaust gas performance is deteriorated at the time of cold. It is conceivable to reduce the catalyst capacity in order to promote the temperature rise of the catalyst. However, if the catalyst capacity is reduced, thermal deterioration of the catalyst is apt to proceed, which causes a problem in durability performance. Also, when there is a difference in the temperature of the exhaust gas flowing into the catalyst between the exhaust systems constituting the dual exhaust system, for example, when it is necessary to lengthen some exhaust pipes in the layout, the lower the inflow temperature is, However, there arises a problem that the temperature rise of the catalyst in the exhaust system (the side where the exhaust pipe is longer) becomes slow.
【０００５】本発明は上記状況に鑑みてなされたもの
で、排気ガス性能とエンジン性能の両立を図ることがで
きる触媒一体型デュアルエキゾーストマニホールドを提
供することを目的とする。The present invention has been made in view of the above circumstances, and has as its object to provide a catalyst-integrated dual exhaust manifold capable of achieving both exhaust gas performance and engine performance.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
の請求項１の本発明では、触媒一体型デュアルエキゾー
ストマニホールドにおいて、各触媒容器内に収容される
触媒を上流側触媒と下流側触媒とに分割して構成し、上
流側触媒の熱容量を小さくすることで、少ない排気ガス
量での触媒の早期活性性を確保し、熱負荷の少ない下流
側触媒により耐久性を確保する。According to the first aspect of the present invention, there is provided a dual exhaust manifold integrated with a catalyst, wherein the catalyst contained in each catalyst container is divided into an upstream catalyst and a downstream catalyst. By reducing the heat capacity of the upstream-side catalyst, early activation of the catalyst with a small amount of exhaust gas is secured, and durability is secured by the downstream-side catalyst with a small heat load.
【０００７】また、上記目的を達成するための請求項２
の本発明では、触媒一体型デュアルエキゾーストマニホ
ールドにおいて、デュアル排気系のうち放熱性が高い側
の排気系の触媒容器内に収容される触媒のみを上流側触
媒と下流側触媒とに分割して構成し、放熱性が高い側の
上流側触媒の熱容量を小さくすることで、少ない排気ガ
ス量での触媒の早期活性性を確保し、熱負荷の少ない下
流側触媒により耐久性を確保する。[0007] In order to achieve the above object, a second aspect of the present invention is provided.
In the present invention, in the catalyst-integrated dual exhaust manifold, only the catalyst housed in the catalyst container of the exhaust system on the high heat dissipation side of the dual exhaust system is divided into an upstream catalyst and a downstream catalyst. In addition, by reducing the heat capacity of the upstream catalyst on the higher heat radiation side, early activation of the catalyst with a small amount of exhaust gas is secured, and durability is secured by the downstream catalyst with a small heat load.
【０００８】そして、請求項３の発明では、触媒貴金属
としてパラジウムを含む上流側触媒として触媒の早期活
性性を一層向上させるようにしている。また、請求項４
の発明では、各排気系の配管を二重管で構成して放熱が
抑制された排気ガスを触媒に送るようにし、早期活性化
を促進するようにしている。また、請求項５の発明で
は、上流側触媒と下流側触媒との間に隙間を形成し、触
媒内の境界層の発達を上流側触媒と下流側触媒とで分断
すると共に上流側触媒を通った排気ガスを隙間で拡散し
て下流側触媒に流入させ、浄化効率を向上させるように
している。According to the third aspect of the present invention, the early-stage activity of the catalyst is further improved as an upstream catalyst containing palladium as a catalyst noble metal. Claim 4
According to the invention, the pipes of each exhaust system are constituted by double pipes, so that exhaust gas whose heat radiation is suppressed is sent to the catalyst, thereby promoting early activation. In the invention of claim 5, a gap is formed between the upstream catalyst and the downstream catalyst, and the development of the boundary layer in the catalyst is divided between the upstream catalyst and the downstream catalyst, and the development of the boundary layer is performed through the upstream catalyst. The exhaust gas diffuses in the gap and flows into the downstream catalyst to improve purification efficiency.
【０００９】また、請求項６の発明では、上流側触媒と
下流側触媒とを異なるセル数とすることで、下流側触媒
での排気ガスの拡散を促進して浄化効率を向上させるよ
うにしている。更に、請求項７、８の発明では、下流側
触媒に対して上流側触媒の熱容量が小さくなるように異
なる壁厚やウォッシュコート量で上流側触媒と下流側触
媒とを構成し、上流側触媒の早期活性性を優位にしてい
る。In the invention of claim 6, the upstream catalyst and the downstream catalyst have different numbers of cells, thereby promoting the diffusion of exhaust gas in the downstream catalyst and improving the purification efficiency. I have. Further, in the invention according to claims 7 and 8, the upstream catalyst and the downstream catalyst are formed with different wall thicknesses and wash coat amounts so that the heat capacity of the upstream catalyst is smaller than that of the downstream catalyst. Has an early activity advantage.
【００１０】[0010]
【発明の実施の形態】図１には本発明の第１実施形態例
に係る触媒一体型デュアルエキゾーストマニホールドの
構造説明、図２には排気管の断面、図３には排気ガスの
流通状況の概念を示してある。尚、図には４気筒エンジ
ンのエキゾーストマニホールドに適用した例を示してあ
るが、勿論、６気筒エンジン等他の多気筒エンジンに対
しても適用可能である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a structure of a catalyst-integrated dual exhaust manifold according to a first embodiment of the present invention, FIG. 2 shows a cross section of an exhaust pipe, and FIG. The concept is shown. Although FIG. 1 shows an example in which the present invention is applied to an exhaust manifold of a four-cylinder engine, the present invention is naturally applicable to other multi-cylinder engines such as a six-cylinder engine.
【００１１】図１に示すように、触媒一体型デュアルエ
キゾーストマニホールド（以下マニホールドと称する）
１は、図示しないエンジンに連結される連結フランジ２
を備え、エンジンの気筒につながる排気系の配管である
４本の排気管３，４，５，６が連結フランジ２にそれぞ
れ接続されている。エンジンに近接して第１触媒容器７
及び第２触媒容器８が配置され、１番気筒につながる排
気管３及び４番気筒につながる排気管６が第１触媒容器
７の入口部９に合流して連結され、２番気筒につながる
排気管４及び３番気筒につながる排気管５が第２触媒容
器８の入口部１０に合流して連結されている。即ち、１
番気筒につながる排気管３及び４番気筒につながる排気
管６の排気系と、２番気筒につながる排気管４及び３番
気筒につながる排気管５の排気系とによりデュアル排気
系が構成されている。As shown in FIG. 1, a catalyst-integrated dual exhaust manifold (hereinafter, referred to as a manifold)
1 is a connecting flange 2 connected to an engine (not shown)
And four exhaust pipes 3, 4, 5, and 6, which are pipes of an exhaust system connected to the cylinder of the engine, are connected to the connection flange 2, respectively. First catalyst container 7 close to engine
And an exhaust pipe 3 connected to the first cylinder and an exhaust pipe 6 connected to the fourth cylinder are joined and connected to the inlet portion 9 of the first catalyst container 7, and the exhaust gas connected to the second cylinder is provided. An exhaust pipe 5 connected to the pipe 4 and the third cylinder joins and is connected to the inlet 10 of the second catalyst container 8. That is, 1
A dual exhaust system is configured by an exhaust system of the exhaust pipe 3 connected to the No. 4 cylinder and the exhaust pipe 6 connected to the No. 4 cylinder, and an exhaust system of the exhaust pipe 4 connected to the No. 2 cylinder and the exhaust pipe 5 connected to the No. 3 cylinder. I have.
【００１２】一方、図２に示すように、排気管３，４，
５，６は、外管3b,4b,5b,6b と厚さが薄い内管3a,4a,5
a,6a との二重構造の管が採用されている。排気管３，
４，５，６を二重管とすることで、排気ガスの温度の低
下を抑制することができ、高温状態の排気ガスを第１触
媒容器７及び第２触媒容器８に送ることができる。尚、
排気管３，４，５，６は、二重管になっていなくてもよ
い。On the other hand, as shown in FIG.
5, 6 are outer tubes 3b, 4b, 5b, 6b and thin inner tubes 3a, 4a, 5b.
A double tube with a and 6a is adopted. Exhaust pipe 3,
By using the double tubes 4, 5, and 6, it is possible to suppress a decrease in the temperature of the exhaust gas, and it is possible to send the exhaust gas in a high temperature state to the first catalyst container 7 and the second catalyst container 8. still,
The exhaust pipes 3, 4, 5, and 6 need not be double pipes.
【００１３】図１に示すように、第１触媒容器７及び第
２触媒容器８の内部に収容される触媒１１は、上流側触
媒１２と下流側触媒１３とに分割して構成されている。
即ち、触媒１１は早期活性用の上流側触媒１２と、性能
及び耐久性確保用の下流側触媒１３とで構成されてい
る。As shown in FIG. 1, the catalyst 11 accommodated in the first catalyst container 7 and the second catalyst container 8 is divided into an upstream catalyst 12 and a downstream catalyst 13.
That is, the catalyst 11 includes an upstream catalyst 12 for early activation and a downstream catalyst 13 for ensuring performance and durability.
【００１４】上流側触媒１２と下流側触媒１３との間に
は金属繊維等がメッシュ状にされた緩衝材１５が配置さ
れ、上流側触媒１２と下流側触媒１３の間には隙間が形
成された状態になっている。また、上流側触媒１２と下
流側触媒１３の周囲にはセラミックス繊維等で作られた
保持材１６が配置されている。Between the upstream catalyst 12 and the downstream catalyst 13, a cushioning material 15 made of metal fibers or the like is arranged, and a gap is formed between the upstream catalyst 12 and the downstream catalyst 13. It is in a state of being left. A holding member 16 made of ceramic fibers or the like is disposed around the upstream catalyst 12 and the downstream catalyst 13.
【００１５】上流側触媒１２と下流側触媒１３は、触媒
貴金属として、例えば、プラチナ・ロジウム系やパラジ
ウム・ロジウム系、または、トリメタル系（プラチナ・
パラジウム・ロジウム系）が採用されている。好ましく
は、上流側触媒１２にパラジウムを含む構成とすること
で、早期活性化（ライトオフ性能）に対して一層有利と
なる。The upstream-side catalyst 12 and the downstream-side catalyst 13 are, for example, platinum-rhodium-based, palladium-rhodium-based, or trimetal-based (noble metal) as a catalytic noble metal.
(Palladium-rhodium) is used. Preferably, the upstream catalyst 12 contains palladium, which is more advantageous for early activation (light-off performance).
【００１６】そして、下流側触媒１３に対して上流側触
媒１２は熱容量が小さくなるように異なる壁厚によって
構成されている。熱容量は、触媒のセル数と壁厚と長さ
の関係により決まるため、例えば、上流側触媒１２のセ
ル数（例えば、900 セル) を下流側触媒１３のセル数
（例えば、400 セル）よりも多くすることで、上流側触
媒１２の壁厚を下流側触媒１３の壁厚より薄くして上流
側触媒１２の方が熱容量が小さくなるようにしている。
なお、下流側に比べて上流側触媒１２の熱容量を小さく
する手法は、壁厚の設定以外の手法を採用してもよく、
例えば、上流側触媒１２のウォッシュコート量を下流側
触媒１３のウォッシュコート量より薄くして上流側触媒
１２の熱容量を小さくすることも可能である。上流側触
媒１２の熱容量を小さくすることで、触媒容器がデュア
ル化されて１つの触媒容器を流れる排気ガス流量が減っ
ても触媒の早期活性化が可能になる。The upstream catalyst 12 has a different wall thickness from the downstream catalyst 13 so that the heat capacity is small. Since the heat capacity is determined by the relationship between the number of catalyst cells, the wall thickness, and the length, for example, the number of cells of the upstream catalyst 12 (for example, 900 cells) is made smaller than the number of cells of the downstream catalyst 13 (for example, 400 cells). By increasing the thickness, the wall thickness of the upstream catalyst 12 is made thinner than the wall thickness of the downstream catalyst 13 so that the heat capacity of the upstream catalyst 12 becomes smaller.
As a method for reducing the heat capacity of the upstream side catalyst 12 as compared with the downstream side, a method other than the setting of the wall thickness may be adopted.
For example, the heat capacity of the upstream catalyst 12 can be reduced by making the wash coat amount of the upstream catalyst 12 smaller than that of the downstream catalyst 13. By reducing the heat capacity of the upstream side catalyst 12, the catalyst can be activated early even if the catalyst container is dualized and the flow rate of exhaust gas flowing through one catalyst container decreases.
【００１７】下流側触媒１３に対して上流側触媒１２は
熱容量が小さくなるように構成されているため、上流側
触媒１２の早期活性性を向上させながら下流側触媒１３
の耐久性を確保することが容易となる。Since the heat capacity of the upstream catalyst 12 is smaller than that of the downstream catalyst 13, the upstream catalyst 12 is improved while the early activity of the upstream catalyst 12 is improved.
, It is easy to ensure the durability.
【００１８】尚、セル径ｒと触媒の長さＬとの関係であ
るＬ／ｒを３０以上に設定することが好ましい。また、
例えば、上流側触媒１２を２４mm以上の長さで必要触媒
容量未満の容量とし、好ましくは、３０mm以上でかつ必
要触媒容量の７０％未満とすることが好ましい。It is preferable to set L / r, which is the relationship between the cell diameter r and the length L of the catalyst, to 30 or more. Also,
For example, it is preferable that the upstream catalyst 12 has a length of 24 mm or more and less than the required catalyst capacity, and more preferably 30 mm or more and less than 70% of the required catalyst capacity.
【００１９】また、図３に示すように、上流側触媒１２
と下流側触媒１３の間には隙間が形成さた状態となって
いるため、上流側触媒１２を流れた排気ガスＧは、下流
側触媒１３に流入する時、隙間で再拡散すると共に上流
側触媒１２のセル内に生成される境界層を分断するた
め、下流側触媒１３内部での排気ガス拡散が進み、触媒
反応を促進し、浄化効率を促進することが可能となる。
さらに、セル数が異なる触媒の組み合わせとすることに
よっても上記境界層の破壊を促進することができ、上記
効果を増加させる。Further, as shown in FIG.
Since a gap is formed between the exhaust gas G flowing through the upstream catalyst 12 and the downstream catalyst 13, the exhaust gas G re-diffuses in the gap and flows into the upstream catalyst 12 when flowing into the downstream catalyst 13. Since the boundary layer generated in the cells of the catalyst 12 is divided, the diffusion of exhaust gas inside the downstream catalyst 13 proceeds, so that the catalytic reaction can be promoted and the purification efficiency can be promoted.
Further, the destruction of the boundary layer can be promoted by using a combination of catalysts having different numbers of cells, and the above effect is increased.
【００２０】上記構成のマニホールド１は、デュアル排
気系を構成する各排気系毎に設けられた第１触媒容器７
及び第２触媒容器８内に設けられた触媒を、上流側触媒
１２と下流側触媒１３に分割したため、一体の触媒に比
べて上流側触媒１２の容量を小さくすることができ、少
ない排気ガス流量で良好なライトオフ性能を確保するこ
とができる。また、下流側触媒１３を上流側触媒１２の
反応熱で効率よく活性させることもできる。また、上流
側触媒１２に比べて熱負荷の少ない下流側触媒１３によ
り耐久性を確保することができる。The manifold 1 having the above-described structure includes a first catalyst container 7 provided for each exhaust system constituting a dual exhaust system.
In addition, since the catalyst provided in the second catalyst container 8 is divided into the upstream catalyst 12 and the downstream catalyst 13, the capacity of the upstream catalyst 12 can be reduced as compared with the integrated catalyst, and the exhaust gas flow rate can be reduced. And good light-off performance can be secured. Further, the downstream catalyst 13 can be efficiently activated by the heat of reaction of the upstream catalyst 12. Further, durability can be ensured by the downstream catalyst 13 having a smaller heat load than the upstream catalyst 12.
【００２１】このため、デュアル排気系によりエンジン
の出力向上を図りながら、十分な触媒性能を確保するこ
とが可能になる。Therefore, it is possible to secure sufficient catalytic performance while improving the output of the engine by the dual exhaust system.
【００２２】図４に基づいて本発明の第２実施形態例を
説明する。図４には本発明の第２実施形態例に係る触媒
一体型デュアルエキゾーストマニホールドの構造説明を
示してある。図１に示した部材と同一部材には同一符号
を付して重複する説明は省略してある。A second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a structural description of a catalyst-integrated dual exhaust manifold according to a second embodiment of the present invention. The same members as those shown in FIG. 1 are denoted by the same reference numerals, and overlapping description is omitted.
【００２３】図４に示した触媒一体型デュアルエキゾー
ストマニホールド（以下マニホールドと称する）２１
は、レイアウト上等の制約により４番気筒につながる排
気管６だけが長くなった場合の構成を示してある。排気
管６だけが長くなった場合、１番気筒につながる排気管
３及び２番気筒につながる排気管４及び３番気筒につな
がる排気管５に比べて排気管６の放熱性が高くなる。こ
のため、触媒が昇温しにくい排気管３及び排気管６から
なる排気系の第１触媒容器７に収容される触媒のみを上
流側触媒１２と下流側触媒１３に分割した構成となって
いる。A catalyst-integrated dual exhaust manifold (hereinafter, referred to as a manifold) 21 shown in FIG.
Shows a configuration in which only the exhaust pipe 6 connected to the fourth cylinder becomes longer due to restrictions on layout and the like. When only the exhaust pipe 6 is long, the heat radiation of the exhaust pipe 6 is higher than that of the exhaust pipe 3 connected to the first cylinder, the exhaust pipe 4 connected to the second cylinder, and the exhaust pipe 5 connected to the third cylinder. For this reason, only the catalyst accommodated in the first catalyst container 7 of the exhaust system including the exhaust pipe 3 and the exhaust pipe 6 in which the temperature of the catalyst hardly rises is divided into the upstream catalyst 12 and the downstream catalyst 13. .
【００２４】図示の配置例に限らず、レイアウト上等の
制約により、第１触媒容器７もしくは第２触媒容器８が
エンジンから離れてされた場合も、エンジンから離れた
方の排気系の放熱性が高くなるため、離れた側の触媒容
器内の触媒のみを上流側触媒１２と下流側触媒１３に分
割した構成とされる。Not only in the arrangement example shown in the figure, but also in the case where the first catalyst container 7 or the second catalyst container 8 is separated from the engine due to restrictions on the layout or the like, the heat radiation of the exhaust system remote from the engine can be improved. Therefore, only the catalyst in the catalyst container on the distant side is divided into the upstream catalyst 12 and the downstream catalyst 13.
【００２５】放熱性が高い方の排気系は触媒のライトオ
フ性で不利になるが、上記構成のマニホールド２１は、
放熱性が高い排気管６を有する排気系の第１触媒容器７
に収容される触媒を上流側触媒１２と下流側触媒１３に
分割したので、一体の触媒に比べて上流側触媒１２の容
量を小さくすることができ、少ない排気ガス流量で良好
なライトオフ性能を確保することができるし、下流側触
媒１３を上流側触媒１２の反応熱で効率よく活性させる
こともできる。また、上流側触媒１２に比べて熱負荷の
少ない下流側触媒１３により耐久性を確保することがで
きる。更に、触媒を分割するのは流入する排気ガス温度
が低い方の排気系のみとしたため、触媒の分割を必要最
小限とすることができ、コストを効率良く抑制すること
ができる。The exhaust system having a higher heat radiation property is disadvantageous due to the light-off property of the catalyst.
Exhaust system first catalyst container 7 having exhaust pipe 6 with high heat dissipation
Is divided into an upstream catalyst 12 and a downstream catalyst 13, so that the capacity of the upstream catalyst 12 can be reduced as compared with the integrated catalyst, and good light-off performance can be achieved with a small exhaust gas flow rate. In addition, the downstream catalyst 13 can be efficiently activated by the reaction heat of the upstream catalyst 12. Further, durability can be ensured by the downstream catalyst 13 having a smaller heat load than the upstream catalyst 12. Furthermore, since the catalyst is divided only in the exhaust system having the lower exhaust gas temperature, the division of the catalyst can be minimized, and the cost can be reduced efficiently.
【００２６】このため、デュアル排気系によりエンジン
の出力向上を図りながら、十分な触媒性能を確保するこ
とが可能になると共に、レイアウト上の問題等デュアル
排気系の各排気系の長さが不等長になった場合であって
も効率良く性能を確保することが可能になる。For this reason, it is possible to ensure sufficient catalytic performance while improving the output of the engine by the dual exhaust system, and the length of each exhaust system of the dual exhaust system is unequal due to layout problems. Even if the length becomes long, it is possible to efficiently secure performance.
【００２７】[0027]
【発明の効果】請求項１の本発明は、デュアル排気系の
各触媒容器内に収容される触媒を上流側触媒と下流側触
媒とに分割して構成したので、早期活性化と性能及び耐
久性向上を両立させることができる。この結果、デュア
ル排気系によりエンジンの出力向上を図りながら、十分
な触媒性能を確保することが可能になる。According to the first aspect of the present invention, the catalyst accommodated in each catalyst container of the dual exhaust system is divided into an upstream catalyst and a downstream catalyst, so that early activation, performance and durability can be achieved. It is possible to achieve both improvement in performance. As a result, it is possible to secure sufficient catalytic performance while improving the output of the engine by the dual exhaust system.
【００２８】請求項２の本発明は、デュアル排気系のう
ち放熱性が高い側の排気系の触媒容器内に収容される触
媒のみを上流側触媒と下流側触媒とに分割して構成した
ので、必要最小限の触媒の分割により早期活性化と性能
及び耐久性向上を両立させることができる。この結果、
デュアル排気系によりエンジンの出力向上を図りなが
ら、十分な触媒性能を確保することが可能になると共
に、レイアウト上の問題等デュアル排気系の各排気系の
長さが不等長になった場合であってもコストを抑制しつ
つ効率良く性能を確保することが可能になる。According to the second aspect of the present invention, only the catalyst housed in the catalyst container of the exhaust system having the higher heat radiation of the dual exhaust system is divided into an upstream catalyst and a downstream catalyst. By dividing the catalyst into the minimum required, it is possible to achieve both early activation and improvement in performance and durability. As a result,
With the dual exhaust system, it is possible to ensure sufficient catalytic performance while improving the engine output, and when the length of each exhaust system of the dual exhaust system becomes unequal, such as layout problems. Even if there is, it is possible to efficiently secure performance while suppressing costs.
【００２９】請求項３の本発明は、触媒貴金属としてパ
ラジウムを含む上流側触媒としたので、上流側触媒の早
期活性性をより一層向上させることができる。また、請
求項４の本発明は、各排気系の配管は二重管で構成され
ているので、触媒に流入する排気ガスの温度低下を抑制
して早期活性性をより一層向上させることができる。ま
た、請求項５の本発明は、上流側触媒と下流側触媒との
間には隙間が形成されているので、上流側触媒と下流側
触媒の間で排気ガスが拡散され、浄化効率を向上させる
ことができる。According to the third aspect of the present invention, since the upstream catalyst contains palladium as a catalytic noble metal, the early activity of the upstream catalyst can be further improved. Further, according to the present invention of claim 4, since the piping of each exhaust system is constituted by a double pipe, it is possible to suppress a decrease in the temperature of the exhaust gas flowing into the catalyst and to further improve the early activity. . Further, according to the present invention, since a gap is formed between the upstream catalyst and the downstream catalyst, the exhaust gas is diffused between the upstream catalyst and the downstream catalyst, thereby improving the purification efficiency. Can be done.
【００３０】また、請求項６の本発明は、上流側触媒と
下流側触媒とを異なるセル数としているので、下流側触
媒での排気ガスの拡散を促進して浄化効率を向上させる
ことができる。また、請求項７、８の本発明は、下流側
触媒に対して上流側触媒の熱容量が小さくなるように異
なる壁厚やウォッシュコート量で上流側触媒と下流側触
媒とが構成されているので、上流側触媒の早期活性性を
向上させながら下流側触媒の耐久性を確保することが容
易となる。According to the sixth aspect of the present invention, since the upstream catalyst and the downstream catalyst have different numbers of cells, diffusion of exhaust gas at the downstream catalyst can be promoted to improve purification efficiency. . According to the present invention, the upstream catalyst and the downstream catalyst have different wall thicknesses and wash coat amounts so that the heat capacity of the upstream catalyst is smaller than that of the downstream catalyst. In addition, it becomes easy to secure the durability of the downstream catalyst while improving the early activity of the upstream catalyst.
【図１】本発明の第１実施形態例に係る触媒一体型デュ
アルエキゾーストマニホールドの構造説明図。FIG. 1 is a structural explanatory view of a catalyst-integrated dual exhaust manifold according to a first embodiment of the present invention.
【図２】排気管の断面図。FIG. 2 is a sectional view of an exhaust pipe.
【図３】排気ガスの流通状況の概念図。FIG. 3 is a conceptual diagram of a distribution state of exhaust gas.
【図４】本発明の第２実施形態例に係る触媒一体型デュ
アルエキゾーストマニホールドの構造説明図。FIG. 4 is a structural explanatory view of a catalyst-integrated dual exhaust manifold according to a second embodiment of the present invention.
１，２１ 触媒一体型デュアルエキゾーストマニホール
ド（マニホールド） ２ 連結フランジ ３，４，５，６ 排気管 ７ 第１触媒容器 ８ 第２触媒容器 ９，１０ 入口部 １１ 触媒 １２ 上流側触媒 １３ 下流側触媒 １５ 緩衝材 １６ 保持材1, 21 Catalyst-integrated dual exhaust manifold (manifold) 2 Connecting flange 3, 4, 5, 6 Exhaust pipe 7 First catalyst vessel 8 Second catalyst vessel 9, 10 Inlet 11 Catalyst 12 Upstream catalyst 13 Downstream catalyst 15 Cushioning material 16 holding material
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 3/28 Ｆ０１Ｎ 3/28 ３０１Ｊ 7/08 7/08 Ａ 7/10 7/10 (72)発明者 織田 英幸 東京都港区芝五丁目33番８号 三菱自動車 工業株式会社内 (72)発明者 出井 龍哉 東京都港区芝五丁目33番８号 三菱自動車 工業株式会社内 Ｆターム(参考） 3G004 BA00 DA02 DA12 3G091 AB01 BA02 FA04 GA06 GA16 GB01W HA03 HA08 HA11 HA12 HA47 HB02 Of the front page Continued (51) Int.Cl. 7 identification mark FI theme Court Bu (Reference) F01N 3/28 F01N 3/28 301J 7/08 7/08 A 7/10 7/10 (72) inventor Hideyuki Oda Tokyo 3-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Tatsuya Ide 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation F-term (reference) 3G004 BA00 DA02 DA12 DA12 3G091 AB01 BA02 FA04 GA06 GA16 GB01W HA03 HA08 HA11 HA12 HA47 HB02
Claims (8)
触媒容器が設けられる触媒一体型デュアルエキゾースト
マニホールドにおいて、各触媒容器内に収容される触媒
を上流側触媒と下流側触媒とに分割して構成したことを
特徴とする触媒一体型デュアルエキゾーストマニホール
ド。1. A catalyst integrated dual exhaust manifold in which a catalyst container is provided for each exhaust system constituting a dual exhaust system, wherein a catalyst contained in each catalyst container is divided into an upstream catalyst and a downstream catalyst. A dual exhaust manifold integrated with a catalyst, characterized in that it is constructed as follows.
触媒容器が設けられる触媒一体型デュアルエキゾースト
マニホールドにおいて、デュアル排気系のうち放熱性が
高い側の排気系の触媒容器内に収容される触媒のみを上
流側触媒と下流側触媒とに分割して構成したことを特徴
とする触媒一体型デュアルエキゾーストマニホールド。2. A dual exhaust system in which a catalyst container is provided for each of the exhaust systems constituting the dual exhaust system. A catalyst-integrated dual exhaust manifold, wherein only the catalyst is divided into an upstream catalyst and a downstream catalyst.
を特徴とする触媒一体型デュアルエキゾーストマニホー
ルド。3. The dual exhaust manifold integrated with a catalyst according to claim 1, wherein the upstream catalyst includes palladium as a catalytic noble metal.
する触媒一体型デュアルエキゾーストマニホールド。4. The catalyst-integrated dual exhaust manifold according to claim 1, wherein a pipe of each exhaust system is constituted by a double pipe.
ることを特徴とする触媒一体型デュアルエキゾーストマ
ニホールド。5. The dual exhaust manifold with integrated catalyst according to claim 1, wherein a gap is formed between the upstream catalyst and the downstream catalyst.
いることを特徴とする触媒一体型デュアルエキゾースト
マニホールド。6. The catalyst-integrated dual exhaust manifold according to claim 1, wherein the upstream catalyst and the downstream catalyst have different numbers of cells.
うに異なる壁厚により上流側触媒と下流側触媒とが構成
されていることを特徴とする触媒一体型デュアルエキゾ
ーストマニホールド。7. The upstream catalyst and the downstream catalyst according to claim 1 or 2, wherein the upstream catalyst and the downstream catalyst have different wall thicknesses so that the heat capacity of the upstream catalyst is smaller than that of the downstream catalyst. Dual exhaust manifold with integrated catalyst.
うに異なるウォッシュコート量にて上流側触媒と下流側
触媒とが構成されていることを特徴とする触媒一体型デ
ュアルエキゾーストマニホールド。8. The upstream catalyst and the downstream catalyst according to claim 1, wherein the upstream catalyst and the downstream catalyst have different wash coat amounts so that the heat capacity of the upstream catalyst is smaller than that of the downstream catalyst. A dual exhaust manifold with integrated catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001110775A JP2002309930A (en) | 2001-04-10 | 2001-04-10 | Catalyst integral-type dual exhaust manifold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001110775A JP2002309930A (en) | 2001-04-10 | 2001-04-10 | Catalyst integral-type dual exhaust manifold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002309930A true JP2002309930A (en) | 2002-10-23 |
Family
ID=18962479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001110775A Pending JP2002309930A (en) | 2001-04-10 | 2001-04-10 | Catalyst integral-type dual exhaust manifold |
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| Country | Link |
|---|---|
| JP (1) | JP2002309930A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1726798A2 (en) | 2005-05-25 | 2006-11-29 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust system, and engine device and vehicle with the same |
| US7454901B2 (en) | 2005-08-05 | 2008-11-25 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust system, and engine device and vehicle with the same |
| WO2013172129A1 (en) * | 2012-05-15 | 2013-11-21 | 日産自動車株式会社 | Exhaust gas discharge device for internal combustion engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06212966A (en) * | 1993-01-19 | 1994-08-02 | Toyota Motor Corp | Exhaust device of transverse v-engine |
| JPH11343840A (en) * | 1998-05-29 | 1999-12-14 | Nissan Motor Co Ltd | Exhaust emission control device for internal combustion engine |
| JP2001079355A (en) * | 1999-09-14 | 2001-03-27 | Daihatsu Motor Co Ltd | Device for cleaning exhaust gas of internal combustion engine |
-
2001
- 2001-04-10 JP JP2001110775A patent/JP2002309930A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06212966A (en) * | 1993-01-19 | 1994-08-02 | Toyota Motor Corp | Exhaust device of transverse v-engine |
| JPH11343840A (en) * | 1998-05-29 | 1999-12-14 | Nissan Motor Co Ltd | Exhaust emission control device for internal combustion engine |
| JP2001079355A (en) * | 1999-09-14 | 2001-03-27 | Daihatsu Motor Co Ltd | Device for cleaning exhaust gas of internal combustion engine |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1726798A2 (en) | 2005-05-25 | 2006-11-29 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust system, and engine device and vehicle with the same |
| US7418818B2 (en) | 2005-05-25 | 2008-09-02 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust system, and engine device and vehicle with the same |
| US7454901B2 (en) | 2005-08-05 | 2008-11-25 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust system, and engine device and vehicle with the same |
| WO2013172129A1 (en) * | 2012-05-15 | 2013-11-21 | 日産自動車株式会社 | Exhaust gas discharge device for internal combustion engine |
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