JP2009257148A - Exhaust gas purifier of internal-combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas purifier of an internal combustion engine which can decrease unevenness in temperature of each of the sections of an exhaust gas purification means than before at the temperature-raise operation. <P>SOLUTION: The exhaust gas purifier 10 of the internal combustion engine 1 has a plurality of penetrating spaces S1 and a filter 12. The through spaces S1 extended from the inlet 12a side to the outlet 12b side is partitioned by a wall part 12c which allows the exhaust gas to permeate, and the function of the filter 12 is regenerated by temperature-raise operation. The operation of the injector 5 of the exhaust gas purifier 10 is controlled so that fuel can be supplied into an exhaust-gas passage 3 at the regeneration of the function of the filter 12. The exhaust-gas passage 3 has a bent part 3a, and the filter 12 is arranged in the part which is more downstream than the bent part 3a, and is continuous with the bent part 3a. A sealed part S2 is included in the plurality of penetrating spaces S1, wherein both the inlet 12a side and the outlet 12b side of the sealed part S2 are blocked. More sealed parts S2 are arranged on the inner peripheral part 14 at the downstream on the inner peripheral side of the bent part 3a of the filter 12 than on the outer peripheral part 13 at the downstream on the outer peripheral side of the bent part 3a of the filter 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、内燃機関の排気通路内に配置され、還元剤が供給されて目標温度まで昇温されることにより機能が再生される排気浄化手段を備えた内燃機関の排気浄化装置に関する。   The present invention relates to an exhaust emission control device for an internal combustion engine, which is provided in an exhaust passage of an internal combustion engine and includes an exhaust purification means whose function is regenerated by supplying a reducing agent and raising the temperature to a target temperature.

内燃機関の排気通路に配置され、排気中に含まれる粒子状物質（ＰＭ）を捕集して排気から粒子状物質を除去するフィルタが知られている。このようなフィルタに対しては、捕集した粒子状物質を酸化除去するために燃料などの還元剤を供給してフィルタを粒子状物質が酸化する目標温度まで昇温する昇温操作が所定の間隔で行われる。フィルタからの放熱が大きいとフィルタの昇温に必要な還元剤の量が多くなる。そこで、フィルタ外周部からの放熱を抑制すべく外周壁からフィルタの中心に向かって所定の長さに存在する流路の両端を全周に亘って閉塞させたフィルタが知られている（例えば、特許文献１参照）。   A filter that is disposed in an exhaust passage of an internal combustion engine and collects particulate matter (PM) contained in the exhaust and removes the particulate matter from the exhaust is known. For such a filter, a heating operation for supplying a reducing agent such as fuel to oxidize and remove the collected particulate matter to raise the temperature of the filter to a target temperature at which the particulate matter is oxidized is predetermined. Done at intervals. If the heat radiation from the filter is large, the amount of reducing agent required for increasing the temperature of the filter increases. Therefore, a filter is known in which both ends of a flow path existing at a predetermined length from the outer peripheral wall toward the center of the filter are closed over the entire circumference in order to suppress heat dissipation from the filter outer peripheral portion (for example, Patent Document 1).

特開２００３−１２６６２９号公報JP 2003-126629 A

フィルタや酸化触媒などの排気浄化手段が設けられている位置や状態によっては排気浄化手段に排気が偏って流入したり、排気浄化手段に還元剤が偏って供給されたりする場合がある。この場合、排気浄化手段には昇温操作時に温度が上昇し易い部分と温度が上昇し難い部分とが生じるが、特許文献１のフィルタのように両端が閉塞された流路を外周全体に同様に配置しても温度のばらつきを抑制することができない。   Depending on the position and state of the exhaust gas purification means such as a filter and an oxidation catalyst, the exhaust gas may flow unevenly into the exhaust gas purification means, or the reducing agent may be supplied unevenly to the exhaust gas purification means. In this case, the exhaust purification means has a part where the temperature is likely to rise during the temperature raising operation and a part where the temperature is difficult to rise. Even if it is arranged in the same position, variation in temperature cannot be suppressed.

そこで、本発明は、昇温操作時における排気浄化手段の各部の温度のばらつきを従来より小さくすることが可能な内燃機関の排気浄化装置を提供することを目的とする。   SUMMARY OF THE INVENTION An object of the present invention is to provide an exhaust gas purification apparatus for an internal combustion engine that can reduce the temperature variation of each part of the exhaust gas purification means during the temperature raising operation.

本発明の第１の内燃機関の排気浄化装置は、入口側から出口側に延びて排気が通過可能な壁部にて仕切られ、かつ前記入口側及び前記出口側の少なくともいずれか一方が閉塞された複数の貫通空間を有し、内燃機関の排気通路内に配置され、昇温操作により機能が再生される排気浄化手段と、前記排気浄化手段を前記昇温操作時の目標温度に昇温すべく前記排気浄化手段より上流の排気通路内に還元剤を供給する還元剤添加手段と、を備えた内燃機関の排気浄化装置において、前記排気通路が曲がり部を有し、前記曲がり部より上流に前記還元剤添加手段が配置されるとともに前記曲がり部より下流、かつ前記排気通路のうち前記曲がり部に続く部分に前記排気浄化手段が配置され、前記複数の貫通空間には、前記入口側及び前記出口側の両方が閉塞された密閉部が含まれ、前記排気浄化手段のうち前記曲がり部の内周側の下流に位置する内周部には、前記排気浄化手段のうち前記曲がり部の外周側の下流に位置する外周部よりも前記密閉部が多く設けられていることにより、上述した課題を解決する（請求項１）。   The exhaust gas purification apparatus for a first internal combustion engine of the present invention is partitioned by a wall portion that extends from the inlet side to the outlet side and through which exhaust can pass, and at least one of the inlet side and the outlet side is closed. A plurality of through spaces, disposed in the exhaust passage of the internal combustion engine, and regenerating the function by the temperature raising operation, and raising the temperature of the exhaust gas purification means to a target temperature at the time of the temperature raising operation. Therefore, in the exhaust gas purification apparatus for an internal combustion engine, a reducing agent adding means for supplying a reducing agent into the exhaust passage upstream of the exhaust purification means, the exhaust passage has a bent portion, and is upstream of the bent portion. The reducing agent addition means is disposed, and the exhaust purification means is disposed downstream of the bent portion and in a portion of the exhaust passage that continues to the bent portion, and the plurality of through spaces include the inlet side and the Both exit side A closed portion is included, and an inner peripheral portion located downstream of the bent portion on the inner peripheral side of the exhaust purification means is located downstream of an outer peripheral side of the bent portion of the exhaust purification means. The above-described problem is solved by providing the sealing portion more than the outer peripheral portion to be performed (Claim 1).

曲がり部より上流の排気通路内に還元剤が供給される場合、その還元剤を含む排気が曲がり部を通過すると遠心力によって還元剤が曲がり部の外周側に寄る。そのため、排気浄化手段の外周部には内周部よりも多くの還元剤が供給され、内周部の温度は外周部の温度と比較して低くなる。本発明の第１の排気浄化装置によれば、排気浄化手段の内周部には外周部よりも密閉部が多く設けられるので、内周部の放熱量を外周部の放熱量よりも小さくすることができる。そのため、昇温操作時における排気浄化手段の各部の温度のばらつきを従来より小さくすることができる。   When the reducing agent is supplied into the exhaust passage upstream of the bent portion, when the exhaust gas containing the reducing agent passes through the bent portion, the reducing agent approaches the outer peripheral side of the bent portion by centrifugal force. Therefore, more reducing agent is supplied to the outer peripheral portion of the exhaust gas purification means than the inner peripheral portion, and the temperature of the inner peripheral portion becomes lower than the temperature of the outer peripheral portion. According to the first exhaust purification device of the present invention, the inner peripheral portion of the exhaust purification means is provided with more sealed portions than the outer peripheral portion, so that the heat dissipation amount of the inner peripheral portion is made smaller than the heat dissipation amount of the outer peripheral portion. be able to. Therefore, the temperature variation of each part of the exhaust gas purifying means during the temperature raising operation can be made smaller than before.

本発明の第１の排気浄化装置の一形態において、前記排気浄化手段は、前記複数の貫通空間が鉛直方向と交差する方向に延びるように前記排気通路内に配置され、前記排気浄化手段の前記外周部のうち鉛直上方に位置する上部には、前記外周部のうち鉛直下方に位置する下部よりも前記密閉部が多く設けられていてもよい（請求項２）。還元剤は排気と比較して重いため、重力によって排気中の還元剤は排気流れの下側に寄る。そのため、排気浄化手段の外周部の上部よりも外周部の下部に還元剤が多く供給され、昇温操作時における外周部の上部の温度は外周部の下部の温度と比較して低くなる。この形態では、外周部の上部には、下部よりも密閉部が多く設けられるので、外周部の上部の放熱量を外周部の下部の放熱量よりも小さくできる。そのため、昇温操作時における排気浄化手段の各部の温度のばらつきをさらに小さくすることができる。   In one aspect of the first exhaust purification apparatus of the present invention, the exhaust purification means is disposed in the exhaust passage so that the plurality of through spaces extend in a direction intersecting a vertical direction, and the exhaust purification means includes the exhaust purification means. The upper part located vertically above the outer peripheral part may be provided with more of the sealing part than the lower part located vertically below the outer peripheral part (Claim 2). Since the reducing agent is heavier than the exhaust, the reducing agent in the exhaust moves closer to the lower side of the exhaust flow due to gravity. Therefore, more reducing agent is supplied to the lower part of the outer peripheral part than the upper part of the outer peripheral part of the exhaust gas purification means, and the temperature of the upper part of the outer peripheral part during the temperature raising operation is lower than the temperature of the lower part of the outer peripheral part. In this embodiment, since the upper portion of the outer peripheral portion is provided with more sealed portions than the lower portion, the heat dissipation amount at the upper portion of the outer peripheral portion can be made smaller than the heat dissipation amount at the lower portion of the outer peripheral portion. Therefore, the temperature variation of each part of the exhaust gas purification means during the temperature raising operation can be further reduced.

本発明の第２の内燃機関の排気浄化装置は、入口側から出口側に延びて排気が通過可能な壁部にて仕切られ、かつ前記入口側及び前記出口側の少なくともいずれか一方が閉塞された複数の貫通空間を有し、内燃機関の排気通路内に配置され、昇温操作により機能が再生される排気浄化手段と、前記排気浄化手段を前記昇温操作時の目標温度に昇温すべく前記排気浄化手段より上流の排気通路内に還元剤を供給する還元剤添加手段と、を備えた内燃機関の排気浄化装置において、前記排気浄化手段は、前記複数の貫通空間が鉛直方向と交差する方向に延びるように前記排気通路内に配置され、前記複数の貫通空間には、前記入口側及び前記出口側の両方が閉塞された密閉部が含まれ、前記排気浄化手段のうち鉛直上方に位置する上部には、前記排気浄化手段のうち鉛直下方に位置する下部よりも前記密閉部が多く設けられていることにより、上述した課題を解決する（請求項３）。   The exhaust gas purification apparatus for a second internal combustion engine of the present invention is partitioned by a wall portion extending from the inlet side to the outlet side and through which exhaust can pass, and at least one of the inlet side and the outlet side is closed. A plurality of through spaces, disposed in the exhaust passage of the internal combustion engine, and regenerating the function by the temperature raising operation, and raising the temperature of the exhaust gas purification means to a target temperature at the time of the temperature raising operation. Therefore, in the exhaust gas purification device for an internal combustion engine, the exhaust gas purification unit includes a reducing agent addition unit that supplies a reducing agent into an exhaust passage upstream of the exhaust gas purification unit. The plurality of through spaces include a sealed portion in which both the inlet side and the outlet side are closed, and are vertically above the exhaust purification unit. In the upper part, By the sealing portion is provided more than the lower positioned vertically below of gas control means, for solving the above problems (claim 3).

上述したように、排気中の還元剤は重力によって排気流れの下側に寄る。そのため、昇温操作時における排気浄化手段の上部の温度は、排気浄化手段の下部の温度よりも低くなる。本発明の第２の排気浄化装置では、排気浄化手段の上部に排気浄化手段の下部よりも多くの密閉部を設けるので、排気浄化手段の上部の放熱量を排気浄化手段の下部の放熱量より小さくできる。そのため、昇温操作時における排気浄化手段の各部の温度のばらつきを従来より小さくできる。   As described above, the reducing agent in the exhaust approaches the lower side of the exhaust flow due to gravity. Therefore, the temperature of the upper part of the exhaust purification unit during the temperature raising operation is lower than the temperature of the lower part of the exhaust purification unit. In the second exhaust purification device of the present invention, since more sealing portions are provided in the upper part of the exhaust purification means than in the lower part of the exhaust purification means, the heat radiation amount at the upper part of the exhaust purification means is made larger than the heat radiation amount at the lower part of the exhaust purification means. Can be small. Therefore, the temperature variation of each part of the exhaust gas purification means during the temperature raising operation can be made smaller than before.

本発明の第１又は第２の排気浄化装置の一形態において、前記排気浄化手段は、前記排気通路内に断熱部材を介して設置されていてもよい（請求項４）。また、前記排気通路のうち前記排気浄化手段が配置される部分は、前記排気通路を形成する外管と前記外管の内側に上流側及び下流側が閉塞される隙間を介して配置される内管とを備える二重管であり、前記排気浄化手段は、前記内管内に配置されていてもよい（請求項５）。このように断熱部材を介して排気浄化手段を設置したり、二重管の内管内に排気浄化手段を配置したりすることにより、排気浄化手段からの放熱量を低減できる。そのため、昇温操作時に消費される還元剤の量を低減できる。また、これらの形態では、断熱部材や二重管によって排気浄化手段からの放熱量を低減できるので、密閉部の数を低減できる。そのため、排気浄化手段の圧力損失を低減することができる。   In one form of the first or second exhaust purification apparatus of the present invention, the exhaust purification means may be installed in the exhaust passage via a heat insulating member (claim 4). The portion of the exhaust passage where the exhaust purification means is disposed is an outer tube that forms the exhaust passage and an inner tube that is disposed inside the outer tube through a gap that blocks the upstream side and the downstream side. And the exhaust gas purification means may be arranged in the inner pipe (Claim 5). Thus, the amount of heat released from the exhaust purification means can be reduced by installing the exhaust purification means via the heat insulating member or by arranging the exhaust purification means in the inner pipe of the double pipe. Therefore, the amount of reducing agent consumed during the temperature raising operation can be reduced. Moreover, in these forms, since the heat release from the exhaust gas purification means can be reduced by the heat insulating member or the double pipe, the number of sealed portions can be reduced. Therefore, the pressure loss of the exhaust purification unit can be reduced.

本発明の第１又は第２の排気浄化装置の一形態においては、前記排気浄化手段より上流、かつ前記還元剤添加手段が還元剤を供給する位置より下流の排気通路に設けられ、入口側から出口側に延びるとともに入口側及び出口側の少なくともいずれか一方が閉塞された複数の貫通空間を有し、それら複数の貫通空間には入口側及び出口側の両方が閉塞された密閉部が含まれている酸化触媒をさらに備え、前記酸化触媒の密閉部の個数は、前記排気浄化手段の密閉部の個数より多くてもよい（請求項６）。一般に排気浄化手段の上流に酸化触媒を設ける場合は、酸化触媒で還元剤を反応させて排気の温度を上昇させ、この排気で排気浄化手段の昇温操作を行う。この形態では、酸化触媒の密閉部の個数を排気浄化手段より多くするので、酸化触媒において還元剤が捕集され易くなり、これにより酸化触媒における還元剤の反応性を向上させることができる。そのため、排気浄化手段を速やかに昇温することができる。   In one form of the first or second exhaust purification device of the present invention, the exhaust purification device is provided in the exhaust passage upstream from the exhaust purification unit and downstream from the position where the reducing agent addition unit supplies the reducing agent, and from the inlet side. It has a plurality of penetrating spaces that extend to the outlet side and at least one of the inlet side and the outlet side is closed, and the plurality of through spaces include a sealed portion that is closed on both the inlet side and the outlet side. The number of sealed portions of the oxidation catalyst may be larger than the number of sealed portions of the exhaust gas purification means (claim 6). In general, when an oxidation catalyst is provided upstream of the exhaust purification means, the reducing agent is reacted with the oxidation catalyst to raise the temperature of the exhaust, and the exhaust purification means is heated with this exhaust. In this embodiment, since the number of sealed portions of the oxidation catalyst is larger than that of the exhaust gas purification means, the reducing agent can be easily collected in the oxidation catalyst, thereby improving the reactivity of the reducing agent in the oxidation catalyst. Therefore, the temperature of the exhaust gas purification unit can be quickly raised.

以上に説明したように、本発明の第１の排気浄化装置によれば、昇温操作時に還元剤が供給され難く温度が上昇し難い排気浄化手段の内周部に外周部よりも多くの密閉部を設けたので、内周部の放熱量を外周部より小さくし、昇温操作時における外周部と内周部の温度差を小さくできる。また、本発明の第２の排気浄化装置によれば、排気浄化手段の上部に下部よりも多くの密閉部を設けたので、上部の放熱量を下部より小さくし、昇温操作時における上部と下部の温度差を小さくできる。そのため、昇温操作時における排気浄化手段の各部の温度のばらつきを従来より小さくすることができる。   As described above, according to the first exhaust gas purification apparatus of the present invention, the inner periphery of the exhaust gas purification means that is difficult to be supplied with the reducing agent and the temperature is difficult to rise during the temperature raising operation is sealed more than the outer peripheral portion. Since the part is provided, the heat radiation amount of the inner peripheral part can be made smaller than that of the outer peripheral part, and the temperature difference between the outer peripheral part and the inner peripheral part during the temperature raising operation can be reduced. Further, according to the second exhaust purification device of the present invention, since the upper part of the exhaust purification unit is provided with more sealing parts than the lower part, the heat radiation amount of the upper part is made smaller than that of the lower part, The temperature difference at the bottom can be reduced. Therefore, the temperature variation of each part of the exhaust gas purifying means during the temperature raising operation can be made smaller than before.

（第１の形態）
図１は、本発明の第１の形態に係る排気浄化装置が組み込まれた内燃機関の要部を示している。図１に示した内燃機関（以下、エンジンと称することがある。）１は、車両に走行用動力源として搭載されるものであり、複数（図１では４つ）の気筒２と、各気筒２から排出された排気が導かれる排気通路３とを備えている。また、エンジン１は、不図示の吸気通路にコンプレッサ４ａが設けられるとともに排気通路３にタービン４ｂが設けられるターボ過給機４を備えている。排気通路３には、排気を浄化するための排気浄化装置１０が設けられている。図１に示したように排気通路３は曲がり部３ａを有しており、排気浄化装置１０は排気の流れ方向において曲がり部３ａの下流に配置されている。各気筒２には、気筒２内に燃料を噴射するためのインジェクタ５がそれぞれ設けられている。 (First form)
FIG. 1 shows a main part of an internal combustion engine in which an exhaust emission control device according to a first embodiment of the present invention is incorporated. An internal combustion engine (hereinafter sometimes referred to as an engine) 1 shown in FIG. 1 is mounted on a vehicle as a driving power source, and includes a plurality of (four in FIG. 1) cylinders 2 and each cylinder. And an exhaust passage 3 through which the exhaust discharged from 2 is guided. The engine 1 includes a turbocharger 4 in which a compressor 4a is provided in an unillustrated intake passage and a turbine 4b is provided in an exhaust passage 3. The exhaust passage 3 is provided with an exhaust purification device 10 for purifying exhaust. As shown in FIG. 1, the exhaust passage 3 has a bent portion 3a, and the exhaust purification device 10 is disposed downstream of the bent portion 3a in the exhaust flow direction. Each cylinder 2 is provided with an injector 5 for injecting fuel into the cylinder 2.

図２を参照して排気浄化装置１０について詳しく説明する。図２は、排気浄化装置１０を拡大して示す図である。排気浄化装置１０は、排気通路３の一部を形成するケーシング１１を備えている。図２に示したようにケーシング１１の内部には、排気中の粒子状物質（ＰＭ）を捕集する排気浄化手段としてのパティキュレートフィルタ（以下、フィルタと略称することがある。）１２が設けられている。図１及び図２に示したようにケーシング１１は、排気通路３のうち曲がり部３ａに続く部分を形成する。そのため、フィルタ１２は、排気通路３の曲がり部３ａの直後に配置される。   The exhaust purification device 10 will be described in detail with reference to FIG. FIG. 2 is an enlarged view of the exhaust purification device 10. The exhaust purification device 10 includes a casing 11 that forms a part of the exhaust passage 3. As shown in FIG. 2, a particulate filter (hereinafter sometimes abbreviated as a filter) 12 as an exhaust purification unit that collects particulate matter (PM) in the exhaust is provided in the casing 11. It has been. As shown in FIGS. 1 and 2, the casing 11 forms a portion of the exhaust passage 3 that follows the bent portion 3 a. Therefore, the filter 12 is disposed immediately after the bent portion 3 a of the exhaust passage 3.

フィルタ１２は、入口１２ａ側から出口１２ｂ側に延びる壁部１２ｃによって仕切られた複数の貫通空間Ｓ１を有している。壁部１２ｃは、例えばセラミック、アルミナ、シリカ−アルミナ、ゼオライト、コーディエライト、層状酸化物等の多孔質材料で構成される。壁部１２ｃの細孔径は、粒子状物質（ＰＭ）を十分に捕集可能な値に設定される。各貫通空間Ｓ１は、入口１２ａ側及び出口１２ｂ側の少なくともいずれか一方がプラグ１２ｄにて閉塞される。そして、これら複数の貫通空間Ｓ１には、入口１２ａ側及び出口１２ｂ側の両方がプラグ１２ｄで閉塞された密閉部Ｓ２が含まれている。図２に示したように密閉部Ｓ２は、フィルタ１２のうち曲がり部３ａの外周側の下流に位置する外周部１３よりも曲がり部３ａの内周側の下流に位置する内周部１４に多く設けられている。図３は、フィルタ１２を上流側、すなわち図２の左側から見た図である。図３に示したようにフィルタ１２では、入口１２ａ側が閉塞された貫通空間Ｓ１と、出口１２ｂが閉塞された貫通空間Ｓ１とが互い違いに並べられている。フィルタ１２の入口１２ａに導かれた排気ガスは、図２の矢印Ａで一例を示した経路を通り、出口１２ｂに導かれる。   The filter 12 has a plurality of through spaces S1 partitioned by a wall portion 12c extending from the inlet 12a side to the outlet 12b side. The wall portion 12c is made of a porous material such as ceramic, alumina, silica-alumina, zeolite, cordierite, or layered oxide. The pore diameter of the wall 12c is set to a value that can sufficiently collect the particulate matter (PM). In each through space S1, at least one of the inlet 12a side and the outlet 12b side is closed by a plug 12d. The plurality of through spaces S1 include a sealed portion S2 in which both the inlet 12a side and the outlet 12b side are closed with plugs 12d. As shown in FIG. 2, the sealing part S2 is more in the inner peripheral part 14 located downstream of the inner peripheral side of the bent part 3a than in the outer peripheral part 13 located downstream of the outer peripheral side of the bent part 3a in the filter 12. Is provided. FIG. 3 is a view of the filter 12 as viewed from the upstream side, that is, from the left side of FIG. As shown in FIG. 3, in the filter 12, the through space S <b> 1 in which the inlet 12 a side is closed and the through space S <b> 1 in which the outlet 12 b is closed are arranged alternately. The exhaust gas guided to the inlet 12a of the filter 12 is guided to the outlet 12b through a path indicated by an example of an arrow A in FIG.

インジェクタ５の動作は、エンジンコントロールユニット（ＥＣＵ）６にて制御される。ＥＣＵ６は、マイクロプロセッサ及びその動作に必要なＲＡＭ、ＲＯＭ等の周辺機器を含んだコンピュータとして構成され、エンジン１に設けられた各種センサからの出力信号に基づいてエンジン１の運転状態を制御する周知のコンピュータユニットである。ＥＣＵ６は、例えばエンジン１の回転数及び負荷に応じて気筒２内に供給すべき燃料量を算出し、この算出した燃料量の燃料がインジェクタ５から噴射されるように各インジェクタ５の動作をそれぞれ制御する。   The operation of the injector 5 is controlled by an engine control unit (ECU) 6. The ECU 6 is configured as a computer including a microprocessor and peripheral devices such as RAM and ROM necessary for its operation, and controls the operating state of the engine 1 based on output signals from various sensors provided in the engine 1. Computer unit. The ECU 6 calculates the amount of fuel to be supplied into the cylinder 2 according to, for example, the rotational speed and load of the engine 1, and controls the operation of each injector 5 so that the calculated amount of fuel is injected from the injector 5. Control.

フィルタ１２では排気中のＰＭが捕集されて保持されるが、フィルタ１２にて保持可能なＰＭの量には上限がある。そこで、ＥＣＵ６はフィルタ１２に保持されているＰＭが酸化除去される目標温度（例えば６００°Ｃ）にフィルタ１２を昇温する昇温操作を実行してフィルタ１２に保持されているＰＭを除去する。以降、この昇温操作をＰＭ再生と称することがある。フィルタ１２の昇温操作は、フィルタ１２に還元剤としての燃料を供給することにより行われる。そして、フィルタ１２への燃料の供給は、各気筒２の排気行程時にインジェクタ５から燃料を噴射させることにより行われる。周知のように排気行程時は気筒２と排気通路３とが連通しているため、この排気行程時にインジェクタ５から燃料を噴射させることにより排気通路３内に燃料を供給することができる。ＥＣＵ６は、ＰＭ再生を行うべき所定のＰＭ再生条件が成立したか否か判断し、ＰＭ再生条件が成立したと判断した場合は、ＰＭ再生が実行されるように各インジェクタ５の動作を制御する。このように制御されることにより、インジェクタ５が本発明の還元剤添加手段として機能する。なお、所定のＰＭ再生条件は、例えばエンジン１の運転時間の積算値が予め設定した所定値を超えた場合に成立したと判断される。この他、ＰＭ再生条件はエンジン１が搭載された車両の走行距離の積算値に基づいて成立したか否か判断してもよい。   The filter 12 collects and holds PM in the exhaust, but there is an upper limit to the amount of PM that can be held by the filter 12. Therefore, the ECU 6 performs a temperature raising operation for raising the temperature of the filter 12 to a target temperature (for example, 600 ° C.) at which the PM held in the filter 12 is oxidized and removed, thereby removing the PM held in the filter 12. . Hereinafter, this temperature raising operation may be referred to as PM regeneration. The temperature raising operation of the filter 12 is performed by supplying fuel as a reducing agent to the filter 12. The fuel is supplied to the filter 12 by injecting fuel from the injector 5 during the exhaust stroke of each cylinder 2. As is well known, since the cylinder 2 and the exhaust passage 3 communicate with each other during the exhaust stroke, fuel can be supplied into the exhaust passage 3 by injecting fuel from the injector 5 during the exhaust stroke. The ECU 6 determines whether or not a predetermined PM regeneration condition for performing PM regeneration is satisfied. If it is determined that the PM regeneration condition is satisfied, the ECU 6 controls the operation of each injector 5 so that PM regeneration is executed. . By being controlled in this way, the injector 5 functions as the reducing agent adding means of the present invention. It is determined that the predetermined PM regeneration condition is satisfied when, for example, the integrated value of the operation time of the engine 1 exceeds a predetermined value set in advance. In addition, the PM regeneration condition may be determined based on the integrated value of the travel distance of the vehicle on which the engine 1 is mounted.

図４は、ＰＭ再生時にフィルタ１２の直径方向各部に供給される燃料量及びＰＭ再生時におけるフィルタ１２の直径方向各部の温度の一例を示している。図４の横軸は、左端がフィルタ１２の内周側の端を示し、右端がフィルタ１２の外周側の端を示している。なお、図４には密閉部Ｓ２がフィルタ１２の外周に均等に配置されている場合にフィルタ１２の直径方向各部に供給される燃料量及びフィルタ１２の直径方向各部の温度を比較例として破線で示す。ＰＭ再生が実行されて排気通路３に燃料が供給されると、この燃料は排気とともにフィルタ１２に送られる。図１に示したようにフィルタ１２の上流には曲がり部３ａが設けられているので、燃料を含む排気が曲がり部３ａを通過すると遠心力で燃料が外側に寄る。そのため、図４に破線で示したようにフィルタ１２の外周に密閉部Ｓ２を均等に配置するとフィルタ１２の外周部１３には内周部１４よりも多くの燃料が供給され、これによりＰＭ再生時に内周部１４の温度と外周部１３の温度との差が大きくなる。   FIG. 4 shows an example of the amount of fuel supplied to each part in the diameter direction of the filter 12 during PM regeneration and the temperature of each part in the diameter direction of the filter 12 during PM regeneration. In the horizontal axis of FIG. 4, the left end indicates the inner peripheral end of the filter 12, and the right end indicates the outer peripheral end of the filter 12. In FIG. 4, when the sealed portion S <b> 2 is evenly arranged on the outer periphery of the filter 12, the amount of fuel supplied to each part in the diametrical direction of the filter 12 and the temperature of each part in the diametrical direction of the filter 12 are indicated by broken lines as a comparative example. Show. When PM regeneration is executed and fuel is supplied to the exhaust passage 3, the fuel is sent to the filter 12 together with the exhaust gas. As shown in FIG. 1, since the bent portion 3a is provided upstream of the filter 12, when the exhaust gas containing fuel passes through the bent portion 3a, the fuel is moved outward by centrifugal force. Therefore, as shown by a broken line in FIG. 4, when the sealing portion S2 is evenly arranged on the outer periphery of the filter 12, more fuel is supplied to the outer peripheral portion 13 of the filter 12 than the inner peripheral portion 14, thereby regenerating PM. The difference between the temperature of the inner peripheral portion 14 and the temperature of the outer peripheral portion 13 is increased.

一方、上述したように本発明ではフィルタ１２の密閉部Ｓ２が外周部１３より内周部１４に多く設けられている。この密閉部Ｓ２では内部の空気層によって熱が逃げることを抑制できるので、放熱量を低減できる。また、この密閉部Ｓ２の内部には燃料が供給されないので、図４に矢印Ｕ１で示したようにこれら密閉部Ｓ２の外側にある貫通空間Ｓ１に供給される燃料量を増加させることができる。そのため、図４に実線で示したようにＰＭ再生時にフィルタ１２の直径方向各部に供給される燃料量のばらつきを小さくできる。また、この際のフィルタ１２の直径方向各部の温度のばらつきを小さくできる。   On the other hand, as described above, in the present invention, the sealing portion S2 of the filter 12 is provided more in the inner peripheral portion 14 than in the outer peripheral portion 13. Since heat can be prevented from escaping by the internal air layer in the sealed portion S2, the amount of heat radiation can be reduced. Further, since fuel is not supplied into the sealed portion S2, the amount of fuel supplied to the through space S1 outside the sealed portion S2 can be increased as indicated by an arrow U1 in FIG. Therefore, as shown by the solid line in FIG. 4, the variation in the amount of fuel supplied to each part in the diameter direction of the filter 12 during PM regeneration can be reduced. Further, the temperature variation of each part in the diameter direction of the filter 12 at this time can be reduced.

以上説明したように、第１の形態の排気浄化装置１０によれば、フィルタ１２の内周部１４に外周部１３よりも多くの密閉部Ｓ２を設けたので、ＰＭ再生時におけるフィルタ１２の各部の温度のばらつきを従来より小さくすることができる。   As described above, according to the exhaust gas purification apparatus 10 of the first embodiment, since the inner peripheral portion 14 of the filter 12 is provided with more sealed portions S2 than the outer peripheral portion 13, each part of the filter 12 at the time of PM regeneration The temperature variation can be made smaller than in the past.

なお、各貫通空間Ｓ１が鉛直方向と交差する方向、例えば水平方向に延びるようにフィルタ１２が排気通路３内に配置されている場合は、外周部１３のうち鉛直下方に位置する下部よりも外周部１３のうち鉛直上方に位置する上部に密閉部Ｓ２を多く設けてもよい。燃料は、排気通路３内を搬送されている際に重力によって徐々に鉛直下方に移動するため、排気通路３の上部よりも排気通路３の下部の方が燃料の濃度が高くなる。そのため、外周部１３の上部よりも外周部１３の下部により多くの燃料が供給される。そこで、外周部１３の下部よりも外周部１３の上部に多くの密閉部Ｓ２を設ける。これにより、外周部１３の上部の放熱量を低減できる。また、外周部１３の上部に設けた密閉部Ｓ２の下側の貫通空間Ｓ１に供給される燃料量を増加させることができる。これにより、外周部１３の各部の温度のばらつきを小さくできる。そのため、ＰＭ再生時におけるフィルタ１２の各部の温度のばらつきをさらに小さくできる。   In the case where the filter 12 is arranged in the exhaust passage 3 so that each through space S1 extends in the direction intersecting the vertical direction, for example, in the horizontal direction, the outer periphery of the outer peripheral portion 13 is lower than the lower portion positioned vertically below. You may provide many sealing part S2 in the upper part located in the upper part of the part 13 vertically. The fuel gradually moves downward vertically due to gravity when it is transported in the exhaust passage 3, so that the concentration of the fuel is higher in the lower portion of the exhaust passage 3 than in the upper portion of the exhaust passage 3. Therefore, more fuel is supplied to the lower part of the outer peripheral part 13 than to the upper part of the outer peripheral part 13. Therefore, a larger number of sealed portions S2 are provided in the upper part of the outer peripheral part 13 than in the lower part of the outer peripheral part 13. Thereby, the heat dissipation of the upper part of the outer peripheral part 13 can be reduced. Further, it is possible to increase the amount of fuel supplied to the lower through space S1 provided in the upper portion of the outer peripheral portion 13 in the sealed portion S2. Thereby, the dispersion | variation in the temperature of each part of the outer peripheral part 13 can be made small. Therefore, the temperature variation of each part of the filter 12 during PM regeneration can be further reduced.

（第２の形態）
図５を参照して本発明の第２の形態に係る排気浄化装置１０について説明する。図５は、第１の形態の図２に対応する図であり、第２の形態に係る排気浄化装置１０を拡大して示している。この形態では、各貫通空間Ｓ１が鉛直方向と交差する方向、例えば水平方向に延びるようにフィルタ１２が排気通路３内に設けられる。なお、図５では、上が鉛直上方であり、下が鉛直下方である。それ以外は第１の形態と同じであるため、第１の形態と共通の部分には同一の符号を付して説明を省略する。 (Second form)
An exhaust emission control device 10 according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a view corresponding to FIG. 2 of the first embodiment, and shows the exhaust purification device 10 according to the second embodiment in an enlarged manner. In this embodiment, the filter 12 is provided in the exhaust passage 3 so that each through space S1 extends in a direction intersecting the vertical direction, for example, in the horizontal direction. In FIG. 5, the upper side is vertically upward and the lower side is vertically downward. Other than that, it is the same as the first embodiment, and therefore, the same reference numerals are given to the parts common to the first embodiment, and the description is omitted.

フィルタ１２においては、図５に示したように密閉部Ｓ２がフィルタ１２の下部２０よりもフィルタ１２の上部２１に多く設けられている。図６は、ＰＭ再生時に図５のフィルタ１２の直径方向各部に供給される燃料量及びＰＭ再生時における図５のフィルタ１２の直径方向各部の温度の一例を示している。図６の横軸は、左端がフィルタ１２の上側の端を示し、右端がフィルタ１２の下側の端を示している。なお、図６には密閉部Ｓ２がフィルタ１２の外周に均等に配置されている場合にフィルタ１２の直径方向各部に供給される燃料量及びフィルタ１２の直径方向各部の温度を比較例として破線で示す。上述したように、燃料は、排気によって搬送されている際に重力によって徐々に鉛直下方に移動するため、排気通路３の上部よりも排気通路３の下部の方が燃料の濃度が高くなる。そのため、密閉部Ｓ２をフィルタ１２の外周に均等に配置すると図６に破線で示したようにフィルタ１２の下部２０には上部２１よりも多くの燃料が供給され、これによりＰＭ再生時にフィルタ１２の下部２０の温度と上部２１の温度との差が大きくなる。   In the filter 12, as shown in FIG. 5, the sealing part S <b> 2 is provided more in the upper part 21 of the filter 12 than in the lower part 20 of the filter 12. FIG. 6 shows an example of the amount of fuel supplied to each part in the diameter direction of the filter 12 in FIG. 5 during PM regeneration and the temperature of each part in the diameter direction of the filter 12 in FIG. 5 during PM regeneration. In the horizontal axis of FIG. 6, the left end indicates the upper end of the filter 12, and the right end indicates the lower end of the filter 12. In FIG. 6, when the sealed portion S <b> 2 is evenly arranged on the outer periphery of the filter 12, the amount of fuel supplied to each part in the diametrical direction of the filter 12 and the temperature of each part in the diametrical direction of the filter 12 are indicated by broken lines as a comparative example. Show. As described above, the fuel gradually moves vertically downward due to gravity when being conveyed by the exhaust, and therefore the concentration of the fuel is higher in the lower portion of the exhaust passage 3 than in the upper portion of the exhaust passage 3. Therefore, when the sealing portion S2 is evenly arranged on the outer periphery of the filter 12, more fuel is supplied to the lower portion 20 of the filter 12 than the upper portion 21 as shown by a broken line in FIG. The difference between the temperature of the lower part 20 and the temperature of the upper part 21 increases.

一方、第２の形態ではフィルタ１２の密閉部Ｓ２を下部２０より上部２１に多く設けたので、上部２１の放熱量を低減できるとともに図６に矢印Ｕ２で示したように上部２１の密閉部Ｓ２の下側にある貫通空間Ｓ１に供給される燃料量を増加させることができる。そのため、図６に実線で示したようにＰＭ再生時にフィルタ１２の直径方向各部に供給される燃料量のばらつきを小さくできる。また、この際のフィルタ１２の直径方向各部の温度のばらつきを小さくできる。   On the other hand, in the second embodiment, since the sealing part S2 of the filter 12 is provided more in the upper part 21 than in the lower part 20, the heat radiation amount of the upper part 21 can be reduced and the sealing part S2 of the upper part 21 as shown by the arrow U2 in FIG. The amount of fuel supplied to the through space S1 on the lower side can be increased. Therefore, as shown by the solid line in FIG. 6, the variation in the amount of fuel supplied to each part in the diameter direction of the filter 12 during PM regeneration can be reduced. Further, the temperature variation of each part in the diameter direction of the filter 12 at this time can be reduced.

以上説明したように、第２の形態の排気浄化装置１０によれば、フィルタ１２の上部２１に下部２０よりも多くの密閉部Ｓ２を設けたので、ＰＭ再生時におけるフィルタ１２の各部の温度のばらつきを従来より小さくすることができる。   As described above, according to the exhaust emission control device 10 of the second embodiment, since the upper portion 21 of the filter 12 is provided with more sealed portions S2 than the lower portion 20, the temperature of each part of the filter 12 during PM regeneration The variation can be made smaller than before.

（第３の形態）
図７を参照して本発明の第３の形態に係る排気浄化装置１０について説明する。図７に示したようにこの形態では、フィルタ１２がケーシング１１内に断熱部材３０を介して設置されている点が異なり、それ以外は上述した各形態と同じである。そのため、図７において上述した各形態と共通の部分には同一の符号を付して説明を省略する。 (Third form)
An exhaust emission control device 10 according to a third embodiment of the present invention will be described with reference to FIG. As shown in FIG. 7, this embodiment is different from the above-described embodiments except that the filter 12 is installed in the casing 11 via a heat insulating member 30. Therefore, in FIG. 7, the same reference numerals are given to portions common to the above-described embodiments, and description thereof is omitted.

図７に示したように断熱部材３０は、ケーシング１１との接触面積及びフィルタ１２との接触面積がそれぞれ小さくなるようにフィルタ１２の外周に嵌め込まれる複数のリング部３０ａと、それらリング部３０ａを接続する接続部３０ｂとで形成されている。断熱部材３０は、例えばフィルタ１２の壁部１２ｃと同じ多孔質材料で形成される。リング部３０ａは、排気がケーシング１１とフィルタ１２との間の隙間を通過して抜けないように適宜の大きさを有している。   As shown in FIG. 7, the heat insulating member 30 includes a plurality of ring portions 30 a that are fitted on the outer periphery of the filter 12 so that the contact area with the casing 11 and the contact area with the filter 12 are reduced, and the ring portions 30 a. The connection part 30b to be connected is formed. The heat insulating member 30 is formed of the same porous material as the wall 12c of the filter 12, for example. The ring portion 30 a has an appropriate size so that the exhaust does not pass through the gap between the casing 11 and the filter 12.

第３の形態の排気浄化装置１０によれば、フィルタ１２とケーシング１１との間に断熱部材３０が設けられるので、フィルタ１２からの放熱を抑制できる。そのため、フィルタ１２に設ける密閉部Ｓ２の個数を減少させることができる。また、フィルタ１２の全体の温度が上昇し易いため、ＰＭ再生時に排気通路３内に供給する燃料量を低減できる。   According to the exhaust emission control device 10 of the third embodiment, since the heat insulating member 30 is provided between the filter 12 and the casing 11, heat radiation from the filter 12 can be suppressed. Therefore, the number of sealed portions S2 provided in the filter 12 can be reduced. Further, since the entire temperature of the filter 12 is likely to rise, the amount of fuel supplied into the exhaust passage 3 during PM regeneration can be reduced.

（第４の形態）
図８は、本発明の第４の形態に係る排気浄化装置１０を示している。なお、図８において上述した各形態と共通の部分には同一の符号を付して説明を省略する。図８に示したようにこの形態では、ケーシング１１が内管４０と外管４１とを有する二重管として構成されており、フィルタ１２が内管４０内に設けられている点が上述した形態と異なる。それ以外は、上述した各形態と同じである。内管４０と外管４１とは中心軸がほぼ同じ位置になるように配置される。内管４０と外管４１との間の隙間４２は、上流側及び下流側がそれぞれ閉塞されている。そのため、隙間４２が空気層となり、内管４０から外管４１への放熱を抑制することができる。 (4th form)
FIG. 8 shows an exhaust purification device 10 according to a fourth embodiment of the present invention. In addition, in FIG. 8, the same code | symbol is attached | subjected to the part which is common in each form mentioned above, and description is abbreviate | omitted. As shown in FIG. 8, in this embodiment, the casing 11 is configured as a double tube having an inner tube 40 and an outer tube 41, and the filter 12 is provided in the inner tube 40. And different. Other than that is the same as each form mentioned above. The inner tube 40 and the outer tube 41 are arranged so that the central axes are at substantially the same position. A gap 42 between the inner tube 40 and the outer tube 41 is closed on the upstream side and the downstream side, respectively. Therefore, the gap 42 becomes an air layer, and heat radiation from the inner tube 40 to the outer tube 41 can be suppressed.

第４の形態の排気浄化装置１０によれば、ケーシング１１を二重管構造にし、フィルタ１２をその二重管の内管４０内に配置したので、フィルタ１２から放熱を抑制できる。そのため、フィルタ１２に設ける密閉部Ｓ２の個数を減少させることができる。また、ＰＭ再生時に排気通路３内に供給する燃料量を低減できる。   According to the exhaust emission control device 10 of the fourth embodiment, since the casing 11 has a double pipe structure and the filter 12 is disposed in the inner pipe 40 of the double pipe, heat radiation from the filter 12 can be suppressed. Therefore, the number of sealed portions S2 provided in the filter 12 can be reduced. Further, the amount of fuel supplied into the exhaust passage 3 during PM regeneration can be reduced.

（第５の形態）
図９は、本発明の第５の形態に係る排気浄化装置１０を示している。なお、図９において上述した各形態と共通の部分には同一の符号を付して説明を省略する。図９は、この形態に係る排気浄化装置１０の概略を示している。図９に示したように、この形態では、フィルタ１２の上流であり、かつ排気通路３内に燃料が供給される位置より下流の排気通路３内に酸化触媒５０が設けられる点が上述した形態と異なる。それ以外は上述した各形態と同じである。 (5th form)
FIG. 9 shows an exhaust purification device 10 according to a fifth embodiment of the present invention. In FIG. 9, the same reference numerals are given to portions common to the above-described embodiments, and description thereof is omitted. FIG. 9 schematically shows the exhaust emission control device 10 according to this embodiment. As shown in FIG. 9, in this embodiment, the oxidation catalyst 50 is provided in the exhaust passage 3 upstream of the filter 12 and downstream of the fuel supply position in the exhaust passage 3. And different. Other than that is the same as each form mentioned above.

酸化触媒５０はフィルタ１２と同じ構造をしており、入口５０ａ側から出口５０ｂ側に延びるとともに入口５０ａ側及び出口５０ｂ側の少なくともいずれか一方が不図示のプラグで閉塞された複数の貫通空間をしている。これら複数の貫通空間には入口５０ａ側及び出口５０ｂ側の両方が閉塞された密閉部５１が含まれている。そして、酸化触媒５０には、フィルタ１２に設けられている密閉部Ｓ２より多い個数の密閉部５１が設けられる。酸化触媒５０では排気中の燃料が酸化反応するため、排気の温度が上昇する。そして、フィルタ１２のＰＭ再生は、酸化触媒５０で温度が上昇した排気を利用して行われる。   The oxidation catalyst 50 has the same structure as the filter 12 and extends from the inlet 50a side to the outlet 50b side, and at least one of the inlet 50a side and the outlet 50b side has a plurality of through spaces closed by plugs (not shown). is doing. The plurality of through spaces include a sealed portion 51 in which both the inlet 50a side and the outlet 50b side are closed. The oxidation catalyst 50 is provided with a larger number of sealing portions 51 than the sealing portions S2 provided in the filter 12. In the oxidation catalyst 50, the fuel in the exhaust undergoes an oxidation reaction, so that the temperature of the exhaust increases. The PM regeneration of the filter 12 is performed using the exhaust gas whose temperature has increased by the oxidation catalyst 50.

第５の形態に係る排気浄化装置１０によれば、酸化触媒５０の密閉部５１の個数がフィルタ１２の密閉部Ｓ２の個数より多いため、酸化触媒５０にて燃料が捕集され易くなる。そのため、酸化触媒５０における燃料の反応性を向上させることができる。従ってＰＭ再生時にフィルタ１２を速やかに昇温することができる。   According to the exhaust gas purification apparatus 10 according to the fifth embodiment, since the number of the sealing portions 51 of the oxidation catalyst 50 is larger than the number of the sealing portions S2 of the filter 12, fuel is easily collected by the oxidation catalyst 50. Therefore, the reactivity of the fuel in the oxidation catalyst 50 can be improved. Accordingly, the temperature of the filter 12 can be quickly raised during PM regeneration.

本発明は上述した各形態に限定されることなく、種々の形態にて実施することができる。例えば、本発明の排気浄化装置が備える排気浄化手段はパティキュレートフィルタに限定されない。例えば、担体に吸蔵還元型ＮＯｘ触媒を担持させた排気浄化触媒が設けられてもよいし、パティキュレートフィルタに吸蔵還元型ＮＯｘ触媒を担持させたものが設けられてもよい。吸蔵還元型ＮＯｘ触媒は排気中に含まれる硫黄酸化物で被毒されるため、触媒の温度を触媒から硫黄（Ｓ）成分が放出される目標温度に上昇させるとともに排気空燃比を理論空燃比又は理論空燃比よりリッチにするＳ再生が所定の間隔で行われる。このＳ再生時にも排気通路内に燃料が添加されるので、本発明によってＳ再生時における触媒の各部の温度のばらつきを小さくすることができる。   This invention is not limited to each form mentioned above, It can implement with a various form. For example, the exhaust gas purification means provided in the exhaust gas purification apparatus of the present invention is not limited to a particulate filter. For example, an exhaust purification catalyst in which a storage reduction type NOx catalyst is supported on a carrier may be provided, or a particulate filter in which a storage reduction type NOx catalyst is supported may be provided. Since the NOx storage reduction catalyst is poisoned by sulfur oxides contained in the exhaust, the temperature of the catalyst is raised to the target temperature at which the sulfur (S) component is released from the catalyst, and the exhaust air-fuel ratio is set to the stoichiometric air-fuel ratio or S regeneration that makes the air-fuel ratio richer than the stoichiometric air-fuel ratio is performed at predetermined intervals. Since the fuel is added to the exhaust passage even during the S regeneration, the present invention can reduce the temperature variation of each part of the catalyst during the S regeneration.

排気通路内に燃料を供給する手段はインジェクタに限定されない。例えば、排気通路にその内部に燃料を噴射する燃料添加弁を設け、フィルタなどの昇温操作時にこの燃料添加弁から排気通路内に燃料を供給してもよい。   The means for supplying fuel into the exhaust passage is not limited to the injector. For example, a fuel addition valve that injects fuel into the exhaust passage may be provided, and fuel may be supplied from the fuel addition valve into the exhaust passage during a temperature rising operation of a filter or the like.

本発明の第１の形態に係る排気浄化装置が組み込まれた内燃機関の概略を示す図。The figure which shows the outline of the internal combustion engine in which the exhaust gas purification apparatus which concerns on the 1st form of this invention was integrated. 図１の排気浄化装置を拡大して示す図。The figure which expands and shows the exhaust gas purification apparatus of FIG. パティキュレートフィルタを上流側から見た図。The figure which looked at the particulate filter from the upstream. ＰＭ再生時にフィルタの直径方向各部に供給される燃料量及びＰＭ再生時におけるフィルタの直径方向各部の温度の一例を示す図。The figure which shows an example of the amount of fuel supplied to each part of the diameter direction of a filter at the time of PM reproduction | regeneration, and the temperature of each part of the filter in the diameter direction at the time of PM reproduction | regeneration. 本発明の第２の形態に係る排気浄化装置を示す図。The figure which shows the exhaust gas purification apparatus which concerns on the 2nd form of this invention. ＰＭ再生時に図５のフィルタの直径方向各部に供給される燃料量及びＰＭ再生時における図５のフィルタの直径方向各部の温度の一例を示す図。FIG. 6 is a diagram showing an example of the amount of fuel supplied to each part in the diameter direction of the filter in FIG. 5 during PM regeneration and the temperature of each part in the diameter direction of the filter in FIG. 5 during PM regeneration. 本発明の第３の形態に係る排気浄化装置を示す図。The figure which shows the exhaust gas purification apparatus which concerns on the 3rd form of this invention. 本発明の第４の形態に係る排気浄化装置を示す図。The figure which shows the exhaust gas purification apparatus which concerns on the 4th form of this invention. 本発明の第５の形態に係る排気浄化装置を示す図。The figure which shows the exhaust gas purification apparatus which concerns on the 5th form of this invention.

符号の説明Explanation of symbols

１ 内燃機関
３ 排気通路
３ａ 曲がり部
５ インジェクタ（還元剤添加手段）
１０ 排気浄化装置
１２ パティキュレートフィルタ（排気浄化手段）
１２ａ 入口
１２ｂ 出口
１２ｃ 壁部
１３ 外周部
１４ 内周部
２０ 下部
２１ 上部
３０ 断熱部材
４０ 内管
４１ 外管
４２ 隙間
５０ 酸化触媒
５０ａ 入口
５０ｂ 出口
５１ 密閉部
Ｓ１ 貫通空間
Ｓ２ 密閉部 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 3 Exhaust passage 3a Bending part 5 Injector (reducing agent addition means)
10 exhaust purification device 12 particulate filter (exhaust purification means)
12a inlet 12b outlet 12c wall portion 13 outer peripheral portion 14 inner peripheral portion 20 lower portion 21 upper portion 30 heat insulating member 40 inner tube 41 outer tube 42 gap 50 oxidation catalyst 50a inlet 50b outlet 51 sealed portion S1 through space S2 sealed portion

Claims (6)

入口側から出口側に延びて排気が通過可能な壁部にて仕切られ、かつ前記入口側及び前記出口側の少なくともいずれか一方が閉塞された複数の貫通空間を有し、内燃機関の排気通路内に配置され、昇温操作により機能が再生される排気浄化手段と、前記排気浄化手段を前記昇温操作時の目標温度に昇温すべく前記排気浄化手段より上流の排気通路内に還元剤を供給する還元剤添加手段と、を備えた内燃機関の排気浄化装置において、
前記排気通路が曲がり部を有し、前記曲がり部より上流に前記還元剤添加手段が配置されるとともに前記曲がり部より下流、かつ前記排気通路のうち前記曲がり部に続く部分に前記排気浄化手段が配置され、
前記複数の貫通空間には、前記入口側及び前記出口側の両方が閉塞された密閉部が含まれ、
前記排気浄化手段のうち前記曲がり部の内周側の下流に位置する内周部には、前記排気浄化手段のうち前記曲がり部の外周側の下流に位置する外周部よりも前記密閉部が多く設けられていることを特徴とする内燃機関の排気浄化装置。 An exhaust passage of an internal combustion engine having a plurality of through spaces extending from an inlet side to an outlet side and partitioned by a wall portion through which exhaust can pass and at least one of the inlet side and the outlet side is closed An exhaust purification means disposed within the exhaust gas and having a function regenerated by a temperature raising operation; and a reducing agent in the exhaust passage upstream of the exhaust purification means to raise the temperature of the exhaust purification means to a target temperature during the temperature raising operation. An exhaust gas purifying device for an internal combustion engine comprising a reducing agent adding means for supplying
The exhaust passage has a bent portion, the reducing agent adding means is disposed upstream from the bent portion, and the exhaust purifying means is disposed downstream of the bent portion and in a portion of the exhaust passage following the bent portion. Arranged,
The plurality of through spaces include a sealed portion in which both the inlet side and the outlet side are closed,
In the exhaust purification means, the inner peripheral portion located downstream of the inner peripheral side of the bent portion has more of the sealing portion than the outer peripheral portion positioned downstream of the outer peripheral side of the bent portion of the exhaust purification means. An exhaust emission control device for an internal combustion engine, comprising: 前記排気浄化手段は、前記複数の貫通空間が鉛直方向と交差する方向に延びるように前記排気通路内に配置され、
前記排気浄化手段の前記外周部のうち鉛直上方に位置する上部には、前記外周部のうち鉛直下方に位置する下部よりも前記密閉部が多く設けられている請求項１に記載の内燃機関の排気浄化装置。 The exhaust purification means is disposed in the exhaust passage so that the plurality of through spaces extend in a direction intersecting the vertical direction,
2. The internal combustion engine according to claim 1, wherein an upper portion of the outer peripheral portion of the exhaust gas purification unit positioned vertically above is provided with more of the sealing portion than a lower portion of the outer peripheral portion positioned vertically below. Exhaust purification device. 入口側から出口側に延びて排気が通過可能な壁部にて仕切られ、かつ前記入口側及び前記出口側の少なくともいずれか一方が閉塞された複数の貫通空間を有し、内燃機関の排気通路内に配置され、昇温操作により機能が再生される排気浄化手段と、前記排気浄化手段を前記昇温操作時の目標温度に昇温すべく前記排気浄化手段より上流の排気通路内に還元剤を供給する還元剤添加手段と、を備えた内燃機関の排気浄化装置において、
前記排気浄化手段は、前記複数の貫通空間が鉛直方向と交差する方向に延びるように前記排気通路内に配置され、
前記複数の貫通空間には、前記入口側及び前記出口側の両方が閉塞された密閉部が含まれ、
前記排気浄化手段のうち鉛直上方に位置する上部には、前記排気浄化手段のうち鉛直下方に位置する下部よりも前記密閉部が多く設けられていることを特徴とする内燃機関の排気浄化装置。 An exhaust passage of an internal combustion engine having a plurality of through spaces extending from an inlet side to an outlet side and partitioned by a wall portion through which exhaust can pass and at least one of the inlet side and the outlet side is closed An exhaust purification means disposed within the exhaust gas and having a function regenerated by a temperature raising operation; and a reducing agent in the exhaust passage upstream of the exhaust purification means to raise the temperature of the exhaust purification means to a target temperature during the temperature raising operation. An exhaust gas purifying device for an internal combustion engine comprising a reducing agent adding means for supplying
The exhaust purification means is disposed in the exhaust passage so that the plurality of through spaces extend in a direction intersecting the vertical direction,
The plurality of through spaces include a sealed portion in which both the inlet side and the outlet side are closed,
An exhaust gas purification apparatus for an internal combustion engine, wherein an upper part of the exhaust gas purification unit located vertically above is provided with more of the sealing part than a lower part of the exhaust gas purification unit located vertically below. 前記排気浄化手段は、前記排気通路内に断熱部材を介して設置されている請求項１〜３のいずれか一項に記載の内燃機関の排気浄化装置。   The exhaust purification device for an internal combustion engine according to any one of claims 1 to 3, wherein the exhaust purification means is installed in the exhaust passage via a heat insulating member. 前記排気通路のうち前記排気浄化手段が配置される部分は、前記排気通路を形成する外管と前記外管の内側に上流側及び下流側が閉塞される隙間を介して配置される内管とを備える二重管であり、
前記排気浄化手段は、前記内管内に配置されている請求項１〜３のいずれか一項に記載の内燃機関の排気浄化装置。 Of the exhaust passage, the portion where the exhaust purification means is disposed includes an outer tube that forms the exhaust passage and an inner tube that is disposed inside the outer tube via a gap that blocks the upstream side and the downstream side. A double pipe with
The exhaust gas purification device for an internal combustion engine according to any one of claims 1 to 3, wherein the exhaust gas purification means is disposed in the inner pipe. 前記排気浄化手段より上流、かつ前記還元剤添加手段が還元剤を供給する位置より下流の排気通路に設けられ、入口側から出口側に延びるとともに入口側及び出口側の少なくともいずれか一方が閉塞された複数の貫通空間を有し、それら複数の貫通空間には入口側及び出口側の両方が閉塞された密閉部が含まれている酸化触媒をさらに備え、
前記酸化触媒の密閉部の個数は、前記排気浄化手段の密閉部の個数より多い請求項１〜５のいずれか一項に記載の排気浄化装置。 Provided in the exhaust passage upstream from the exhaust purification means and downstream from the position where the reducing agent addition means supplies the reducing agent, extends from the inlet side to the outlet side, and closes at least one of the inlet side and the outlet side. A plurality of through-spaces, and the plurality of through-spaces further includes an oxidation catalyst that includes a sealed portion in which both the inlet side and the outlet side are closed,
The exhaust emission control device according to any one of claims 1 to 5, wherein the number of sealed portions of the oxidation catalyst is greater than the number of sealed portions of the exhaust purification unit.

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