JP2007040149A - Exhaust emission control device of internal combustion engine - Google Patents

Exhaust emission control device of internal combustion engine Download PDF

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JP2007040149A
JP2007040149A JP2005224040A JP2005224040A JP2007040149A JP 2007040149 A JP2007040149 A JP 2007040149A JP 2005224040 A JP2005224040 A JP 2005224040A JP 2005224040 A JP2005224040 A JP 2005224040A JP 2007040149 A JP2007040149 A JP 2007040149A
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exhaust
oxidation catalyst
catalyst
internal combustion
stage oxidation
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Inventor
Hiroaki Fujita
博昭 藤田
Yoshihisa Takeda
好央 武田
Satoshi Hiranuma
智 平沼
Ritsuko Shinozaki
律子 篠▲崎▼
Reiko Domeki
礼子 百目木
Shinichi Saito
真一 斎藤
Yasuko Suzuki
康子 鈴木
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Mitsubishi Fuso Truck and Bus Corp
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Mitsubishi Fuso Truck and Bus Corp
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Priority to JP2005224040A priority Critical patent/JP2007040149A/en
Publication of JP2007040149A publication Critical patent/JP2007040149A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/04—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of an exhaust pipe, manifold or apparatus in relation to vehicle frame or particular vehicle parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the mountability onto a vehicle and the heat retaining property in a casing. <P>SOLUTION: The device is equipped with an inner wall which is arranged so as to partition into four chambers in a latticed manner the inside of a casing (18) in which exhaust from an internal combustion engine is led and to successively flow the exhaust from the internal combustion engine through each of four chambers, wherein a prior stage oxidation catalyst (28), a particulate filter (32), a selective reduction type NOx catalyst (42) for removing NOx in exhaust by adding aqueous urea and a post-stage oxidation catalyst (46) are sequentially stored from the chamber placed on the upstream side in the flow of exhaust in the casing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内燃機関の排気浄化装置に係り、詳しくは、アンモニアを還元剤として排気中の窒素酸化物を還元浄化させる触媒と排気中のパティキュレートを捕集するパティキュレートフィルタとを備えた排気浄化装置に関する。   The present invention relates to an exhaust gas purification apparatus for an internal combustion engine, and more specifically, an exhaust gas equipped with a catalyst for reducing and purifying nitrogen oxide in exhaust gas using ammonia as a reducing agent and a particulate filter for collecting particulates in the exhaust gas. The present invention relates to a purification device.

一般に、ディーゼルエンジンの如くリーン空燃比での燃焼が行われる内燃機関では、燃料が気筒内に取り込まれて圧縮された空気に噴射され、自発火によって燃焼するために、ＮＯｘ（窒素酸化物）の発生が顕著になる。そこで、このＮＯｘからＯ２（酸素）を奪ってＮ２（窒素）に還元させる技術が知られている。
この種の技術の一例としては、尿素を還元剤にして排気中のＮＯｘを選択還元する選択還元型ＮＯｘ触媒（ＳＣＲ触媒）が用いられている。具体的には、排気にユリア水（尿素水）を添加すると、尿素がＮＨ３（アンモニア）に変化する。そして、ＳＣＲ触媒内ではこのＮＨ３と排気中のＮＯｘとが結びついて水とＮ２とに分解され、ＮＯｘの浄化が行われる。 In general, in an internal combustion engine that performs combustion at a lean air-fuel ratio, such as a diesel engine, fuel is taken into a cylinder, injected into compressed air, and burned by self-ignition, so that NOx (nitrogen oxide) Occurrence becomes remarkable. Thus, a technique for depriving O 2 (oxygen) from this NOx and reducing it to N 2 (nitrogen) is known.
As an example of this type of technology, a selective reduction type NOx catalyst (SCR catalyst) that selectively reduces NOx in exhaust gas using urea as a reducing agent is used. Specifically, the addition of urea water (urea water) in the exhaust, urea changes to NH 3 (ammonia). In the SCR catalyst, this NH 3 and NOx in the exhaust are combined and decomposed into water and N 2 to purify NOx.

一方、このディーゼルエンジンでは、上記燃焼の故に排気中に含まれるパティキュレート（ＰＭ）の浄化も要求される。このＰＭについてはパティキュレートフィルタ（ＤＰＦ）にて捕集され、捕集されたＰＭは、ＤＰＦの強制再生、つまり、ＤＰＦの昇温によって強制的に焼却されて浄化される。
ここで、上述したＳＣＲ触媒或いはＤＰＦのいずれか一方を備えた単独のシステムではますます厳しくなる排出ガス規制への対応が困難になり得ることを鑑み、これらＳＣＲ触媒とＤＰＦとを組み合わせた排気浄化装置の技術が知られている（例えば、特許文献１参照）。
特表２００４−５３５９１１号公報 On the other hand, this diesel engine is also required to purify particulates (PM) contained in the exhaust gas because of the combustion. This PM is collected by a particulate filter (DPF), and the collected PM is forcibly incinerated and purified by forced regeneration of the DPF, that is, by raising the temperature of the DPF.
Here, in view of the fact that a single system equipped with either the above-mentioned SCR catalyst or DPF may make it difficult to comply with exhaust gas regulations that are becoming increasingly strict, exhaust purification that combines these SCR catalyst and DPF The technique of the apparatus is known (for example, refer to Patent Document 1).
JP-T-2004-535911

ところで、上述の排気浄化装置では、ＤＰＦとＳＣＲ触媒とは断面同士が向かい合って直列に配置され、これらＤＰＦとＳＣＲ触媒とが長筒状の筐体内に収納されている。このように、ＤＰＦとＳＣＲ触媒とを単純に組み合わせると、上記単独のシステムの約２倍の搭載スペースを要することになり、スペースに余裕の少ない車種には搭載が困難になるとの問題がある。   By the way, in the above-described exhaust purification device, the DPF and the SCR catalyst are arranged in series with their cross-sections facing each other, and the DPF and the SCR catalyst are housed in a long cylindrical casing. As described above, when the DPF and the SCR catalyst are simply combined, a mounting space that is approximately twice that of the single system described above is required, and there is a problem that it is difficult to mount in a vehicle type with a small space.

また、上述の排気浄化装置では、筐体の表面積が大きくなり、筐体内の保温性も悪化することになるが、この点についても課題が残されている。
本発明は、このような課題に鑑みてなされたもので、車両への搭載性及び筐体内の保温性の向上を図ることができる内燃機関の排気浄化装置を提供することを目的とする。 Moreover, in the above-described exhaust purification apparatus, the surface area of the housing is increased, and the heat retention in the housing is also deteriorated, but there is still a problem with this point.
The present invention has been made in view of such a problem, and an object of the present invention is to provide an exhaust gas purification apparatus for an internal combustion engine that can improve mounting properties on a vehicle and heat retention in a housing.

上記の目的を達成するべく、請求項１記載の内燃機関の排気浄化装置は、内燃機関からの排気が導入される筐体と、前記筐体の内部を格子状に４つの室に区切るとともに前記内燃機関からの排気が前記４つの各室を順次流れるように配設された内壁とを備え、前記筐体内における排気流れの上流側に位置する室から順に、前段酸化触媒、パティキュレートフィルタ、ユリア水の添加によって排気中のＮＯｘを浄化する選択還元型ＮＯｘ触媒、および後段酸化触媒が収納されていることを特徴としている。   In order to achieve the above object, an exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein a casing into which exhaust gas from the internal combustion engine is introduced, and the inside of the casing are partitioned into four chambers in a lattice shape, and And an inner wall arranged so that exhaust from the internal combustion engine sequentially flows through each of the four chambers, and in order from the chamber located upstream of the exhaust flow in the casing, a pre-stage oxidation catalyst, a particulate filter, a urea A selective reduction type NOx catalyst that purifies NOx in the exhaust gas by adding water and a post-stage oxidation catalyst are housed.

また、請求項２記載の発明では、前記筐体は、前記パティキュレートフィルタの出口近傍位置にて前記ユリア水を添加する添加手段と、前記パティキュレートフィルタから排出された排気が隣り合う前記選択還元型ＮＯｘ触媒に流れる際に前記前段酸化触媒の軸線および前記後段酸化触媒の軸線を含む平面近傍の位置まで迂回させる迂回路形成部とを備えていることを特徴としている。   Further, in the invention according to claim 2, the casing includes the selective reduction in which the urea water is added at a position in the vicinity of the outlet of the particulate filter, and the exhaust discharged from the particulate filter is adjacent. And a detour formation part that detours to a position in the vicinity of a plane including the axis of the front-stage oxidation catalyst and the axis of the rear-stage oxidation catalyst when flowing through the NOx catalyst.

更に、請求項３記載の発明では、前記筐体内に前段酸化触媒、パティキュレートフィルタ、選択還元型ＮＯｘ触媒、および後段酸化触媒の排気流れ方向が車両前後方向に対して略直交方向となるように各々配置され、前記後段酸化触媒が前記筐体の区切られた室のうちの車両前側で且つ下段に位置する室に配置されたことを特徴としている。   Furthermore, in the invention according to claim 3, the exhaust flow direction of the front stage oxidation catalyst, the particulate filter, the selective reduction type NOx catalyst, and the rear stage oxidation catalyst in the casing is substantially perpendicular to the vehicle longitudinal direction. Each of the rear-stage oxidation catalysts is disposed in a chamber located on the vehicle front side and in the lower stage among the chambers partitioned by the casing.

従って、請求項１記載の本発明の内燃機関の排気浄化装置によれば、前段酸化触媒、パティキュレートフィルタ、選択還元型ＮＯｘ触媒、及び後段酸化触媒が束ねられて筐体内に収納されているので、従来に比して筐体の表面積の最小化が図られる。この結果、排気浄化装置の重量が軽減され、車両への搭載性が向上する。また、筐体内の保温性が良好となり、排気浄化手段の活性が促進されて浄化率の向上に寄与する。   Therefore, according to the exhaust gas purification apparatus for an internal combustion engine of the first aspect of the present invention, the front stage oxidation catalyst, the particulate filter, the selective reduction type NOx catalyst, and the rear stage oxidation catalyst are bundled and housed in the casing. Thus, the surface area of the housing can be minimized as compared with the conventional case. As a result, the weight of the exhaust emission control device is reduced, and the mountability on the vehicle is improved. In addition, the heat retention in the housing is improved, and the activity of the exhaust gas purification means is promoted, contributing to the improvement of the purification rate.

また、請求項２記載の発明によれば、パティキュレートフィルタと選択還元型ＮＯｘ触媒との間には迂回路形成部が設けられており、ユリア水は、パティキュレートフィルタの軸線及び選択還元型ＮＯｘ触媒の軸線を含む平面に沿って選択還元型ＮＯｘ触媒に導入されるのではなく、前段酸化触媒の軸線及び後段酸化触媒の軸線を含む平面側を経てから選択還元型ＮＯｘ触媒に導入されている。よって、ユリア水の長い移動経路が確保されるので、ユリア水が排気中に均一に拡散され易くなってＮＯｘ浄化率がより一層向上する。   According to the second aspect of the present invention, the detour formation unit is provided between the particulate filter and the selective reduction type NOx catalyst, and urea water is supplied from the axis of the particulate filter and the selective reduction type NOx. Rather than being introduced into the selective catalytic reduction NOx catalyst along a plane including the axis of the catalyst, it is introduced into the selective catalytic reduction NOx catalyst after passing through the plane side including the axis of the preceding oxidation catalyst and the axis of the subsequent oxidation catalyst. . Therefore, since a long movement path of urea water is secured, urea water is easily diffused uniformly in the exhaust gas, and the NOx purification rate is further improved.

更に、請求項３記載の発明によれば、後段酸化触媒が車両前側の下段に位置させたので、排気を筐体の比較的前側の位置から排出することが可能となり、例えばトラックのスペアタイヤ等の後方架装物と排気導出口との距離が遠くなり、この架装物に対する熱害が回避可能となる。   Further, according to the third aspect of the invention, since the rear stage oxidation catalyst is located at the lower stage on the front side of the vehicle, the exhaust can be discharged from a relatively front side position of the housing, such as a spare tire for a truck. The distance between the rear bodywork and the exhaust outlet is increased, and thermal damage to the bodywork can be avoided.

以下、図面により本発明の実施形態について説明する。本実施形態に係る内燃機関の排気浄化装置は、例えば、図１に示されたトラック２に搭載されている。
同図に示されるように、当該トラック２にはキャブ４が備えられ、このキャブ４の下側には、はしご型のフレーム６が後方に向けて延設されている。また、キャブ４とフレーム６との間にはディーゼルエンジン８が配設されており（同図（ｂ））、このエンジン８の後側、詳しくはキャブ４の後面側であってフレーム６の右側部分には排気浄化装置１０が配設されている。なお、このフレーム６の左側部分の適宜位置には、燃料タンク１２、バッテリ１４やユリア水タンク１６が配設されている。そして、上記排気浄化装置１０には、エンジン８からの排気が導入されており、この導入された排気を浄化し、図示しないマフラを介して外部に放出する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The exhaust gas purification apparatus for an internal combustion engine according to the present embodiment is mounted, for example, on a truck 2 shown in FIG.
As shown in the figure, the truck 2 is provided with a cab 4, and a ladder-type frame 6 extends rearward under the cab 4. Further, a diesel engine 8 is disposed between the cab 4 and the frame 6 ((b) in the figure). The rear side of the engine 8, more specifically, the rear side of the cab 4 and the right side of the frame 6 is disposed. An exhaust purification device 10 is disposed in the portion. A fuel tank 12, a battery 14, and a urea water tank 16 are disposed at appropriate positions on the left side of the frame 6. Exhaust gas from the engine 8 is introduced into the exhaust gas purification device 10, and the introduced exhaust gas is purified and released to the outside through a muffler (not shown).

当該排気浄化装置１０は、図２に示されるように、立方体の筐体１８を備えている。この筐体１８にはトラック２の進行方向（前方向）に向けて延びた導入ポート２０が設けられており、導入ポート２０がエンジン８に接続されることにより、エンジン８からの排気は筐体１８内に導入される。
また、この筐体１８内には４つの円筒状の排気浄化手段が収納され、トラック２の幅方向に沿ってそれぞれ配設されている。具体的には、図２のＡ−Ａ線に沿う図３（ａ）に示されるように、エンジン８から上記マフラまでの排気の流れ方向でみて、前段酸化触媒２８、ＤＰＦ（パティキュレートフィルタ）３２、ＳＣＲ触媒（選択還元型ＮＯｘ触媒）４２、及び後段酸化触媒４６が順次介挿されている。 As shown in FIG. 2, the exhaust purification device 10 includes a cubic housing 18. The casing 18 is provided with an introduction port 20 extending in the traveling direction (forward direction) of the track 2. When the introduction port 20 is connected to the engine 8, exhaust from the engine 8 is exhausted to the casing. 18 is introduced.
Also, four cylindrical exhaust purification means are accommodated in the casing 18 and are arranged along the width direction of the track 2. Specifically, as shown in FIG. 3A along the line AA in FIG. 2, when viewed in the flow direction of the exhaust gas from the engine 8 to the muffler, the pre-stage oxidation catalyst 28, DPF (particulate filter) 32, an SCR catalyst (selective reduction type NOx catalyst) 42, and a post-stage oxidation catalyst 46 are sequentially inserted.

当該前段酸化触媒２８では、排気中のＮＯを酸化させてＮＯ２を生成しており、このＮＯ２を酸化剤としてＤＰＦ３２に供給している。また、ＤＰＦ３２は、排気の上流側と下流側とを連通させる複数個の通路が並設されているとともに、各通路の上流側の開口部分と下流側の開口部分とが交互に閉鎖されている。そして、このＤＰＦ３２では、排気中のパティキュレート（ＰＭ）を捕集して堆積させる一方、このＰＭと前段酸化触媒２８から供給されたＮＯ２との反応によって堆積したＰＭを燃焼する。 In the pre-stage oxidation catalyst 28, NO 2 in the exhaust is oxidized to generate NO 2 , and this NO 2 is supplied to the DPF 32 as an oxidant. The DPF 32 includes a plurality of passages that allow the upstream side and the downstream side of the exhaust to communicate with each other, and the upstream opening portion and the downstream opening portion of each passage are alternately closed. . The DPF 32 collects and deposits particulates (PM) in the exhaust gas, and combusts the PM deposited by the reaction between the PM and NO 2 supplied from the pre-stage oxidation catalyst 28.

次に、ＳＣＲ触媒４２は、添加されたＮＨ３を吸着させ、このＮＨ３を還元剤として排気中のＮＯｘを浄化している。また、後段酸化触媒４６では、ＳＣＲ触媒４２において余剰になることがあるＮＨ３を酸化させてＮ２を生成し、更に、ＤＰＦ３２によるＰＭの燃焼に伴って生じる場合があるＣＯを酸化させてＣＯ２を生成している。
そして、同図（ａ）に示される如く、前段酸化触媒２８の軸線が上記導入ポート２０に対し横向きに略直交して配置されており、ＤＰＦ３２は前段酸化触媒２８の車両後側にて平行に配置されている。また、ＳＣＲ触媒４２はＤＰＦ３２の下側に配置され、後段酸化触媒４６はＳＣＲ触媒４２の車両前側にＳＣＲ触媒４２と平行に配置されている。 Next, the SCR catalyst 42 adsorbs the added NH 3 and purifies NOx in the exhaust gas using the NH 3 as a reducing agent. Further, the post-stage oxidation catalyst 46 oxidizes NH 3 that may be excessive in the SCR catalyst 42 to generate N 2 , and further oxidizes CO that may be generated by the combustion of PM by the DPF 32 to produce CO 2. 2 is generated.
As shown in FIG. 6A, the axis of the front oxidation catalyst 28 is disposed substantially orthogonal to the introduction port 20 in the lateral direction, and the DPF 32 is parallel to the rear side of the front oxidation catalyst 28 in the vehicle. Has been placed. The SCR catalyst 42 is disposed below the DPF 32, and the rear oxidation catalyst 46 is disposed in front of the SCR catalyst 42 in parallel with the SCR catalyst 42.

より具体的には、筐体１８内は垂直壁２２及び平行壁２４によって略４等分に分割されている。この垂直壁（内壁）２２は、トラック２の上下方向に延びて配置されており、前段酸化触媒２８の入口側とＤＰＦ３２の出口側とを遮断する一方、前段酸化触媒２８の出口側とＤＰＦ３２の入口側とは遮断しない長さに構成されている。また、この垂直壁２２は、ＳＣＲ触媒４２の入口側と後段酸化触媒４６の出口側とを遮断する一方、ＳＣＲ触媒４２の出口側と後段酸化触媒４６の入口側とは遮断しない長さに構成されている。   More specifically, the inside of the housing 18 is divided into approximately four equal parts by the vertical wall 22 and the parallel wall 24. The vertical wall (inner wall) 22 is arranged extending in the vertical direction of the track 2 and blocks the inlet side of the front-stage oxidation catalyst 28 and the outlet side of the DPF 32, while the outlet side of the front-stage oxidation catalyst 28 and the DPF 32. It is configured to have a length that does not block the entrance side. The vertical wall 22 is configured to have a length that blocks the inlet side of the SCR catalyst 42 and the outlet side of the rear-stage oxidation catalyst 46, but does not block the outlet side of the SCR catalyst 42 and the inlet side of the rear-stage oxidation catalyst 46. Has been.

そして、図２のＢ−Ｂ線に沿う図３（ｂ）に示されるように、前段酸化触媒２８の入口側には導入ポート２０に連通する入口側通路２６が形成され、当該入口側通路２６は垂直壁２２及び遮蔽板（内壁）２５によって区画されている。なお、後段酸化触媒４６の出口側には下方向に向けて延びた導出ポート４８が設けられており、この導出ポート４８がテールパイプに接続されている。   As shown in FIG. 3B along the line BB in FIG. 2, an inlet side passage 26 communicating with the introduction port 20 is formed on the inlet side of the pre-stage oxidation catalyst 28, and the inlet side passage 26 Is partitioned by a vertical wall 22 and a shielding plate (inner wall) 25. A derivation port 48 extending downward is provided on the outlet side of the post-stage oxidation catalyst 46, and the derivation port 48 is connected to the tail pipe.

また、図２のＣ−Ｃ線に沿う図４（ａ）に示されるように、前段酸化触媒２８の出口側とＤＰＦ３２の入口側との間には連通路３０が形成され、更に、ＳＣＲ触媒４２の出口側と後段酸化触媒４６の入口側との間にも連通路４４が形成されている。
これに対し、平行壁（内壁）２４は、その法線方向がトラック２の高さ方向に向けて配置され、図３（ｂ）や図４（ａ）に示されるように、前段酸化触媒２８と後段酸化触媒４６とを遮断するとともに、ＤＰＦ３２とＳＣＲ触媒４２とを遮断し、更に、連通路３０と連通路４４とを遮断する長さに構成されている。 Further, as shown in FIG. 4A along line CC in FIG. 2, a communication passage 30 is formed between the outlet side of the pre-stage oxidation catalyst 28 and the inlet side of the DPF 32, and further, the SCR catalyst. A communication path 44 is also formed between the outlet side of 42 and the inlet side of the post-stage oxidation catalyst 46.
On the other hand, the parallel wall (inner wall) 24 is arranged so that the normal direction thereof is directed to the height direction of the track 2, and as shown in FIG. 3B and FIG. And the downstream oxidation catalyst 46, the DPF 32 and the SCR catalyst 42 are blocked, and the communication path 30 and the communication path 44 are blocked.

一方、上記遮蔽板２５は、図２のＤ−Ｄ線に沿う図４（ｂ）に示されるように、その法線方向がトラック２の幅方向に向けて配置されており、前段酸化触媒２８の入口側と後段酸化触媒４６の出口側とを覆うものの、ＤＰＦ３２の出口側とＳＣＲ触媒４２の入口側とは覆わない長さに構成されている。なお、ＤＰＦ３２の出口側にはユリア水を添加する添加インジェクタ（添加手段）３６が配設されている。この添加インジェクタ３６はユリア水タンク１６に接続され、その噴射口はＤＰＦ３２の出口側通路３４にてトラック２の前方向に向けて開口している。   On the other hand, as shown in FIG. 4B along the line D-D in FIG. 2, the shielding plate 25 is arranged with its normal direction facing the width direction of the track 2. However, the outlet side of the DPF 32 and the inlet side of the SCR catalyst 42 are not covered with each other. An addition injector (addition means) 36 for adding urea water is disposed on the outlet side of the DPF 32. The addition injector 36 is connected to the urea water tank 16, and its injection port opens toward the front side of the track 2 in the outlet side passage 34 of the DPF 32.

また、この出口側通路３４とＳＣＲ触媒４２の入口側通路４０との間には迂回路形成板（迂回路形成部）３５が配置されている。
具体的には、図２のＥ−Ｅ線に沿う図５（ａ）に示されるように、この迂回路形成板３５は、トラック２の前方向に向けて配置されている。すなわち、迂回路形成板３５は、添加インジェクタ３６を備えた筐体１８の面の内側部分から垂直壁２２を超え、前段酸化触媒２８及び後段酸化触媒４６の各軸線を含む平面近傍の位置にまで達する長さに構成されている。これにより、出口側通路３４と入口側通路４０との間にはユリア水の迂回路３８が形成される。 Further, a detour forming plate (detour forming unit) 35 is disposed between the outlet side passage 34 and the inlet side passage 40 of the SCR catalyst 42.
Specifically, as shown in FIG. 5A along the line EE in FIG. 2, the detour formation plate 35 is disposed toward the front direction of the track 2. That is, the detour formation plate 35 extends from the inner part of the surface of the housing 18 with the addition injector 36 to the position near the plane including the axes of the front-stage oxidation catalyst 28 and the rear-stage oxidation catalyst 46 from the vertical wall 22. It is configured to reach the length. Thereby, a detour 38 of urea water is formed between the outlet side passage 34 and the inlet side passage 40.

このように、本実施形態の排気浄化装置１０においては、図５（ｂ）に実線で示される如く、エンジン８からの排気は、導入ポート２０から入口側通路２６に達して前段酸化触媒２８に導入され（図３）、連通路３０を介してトラック２の前後方向に沿って移動してＤＰＦ３２に導入される（図４）。次いで、添加インジェクタ３６から排気中に添加されたユリア水は、出口側通路３４、迂回路３８及び入口側通路４０の順にて逆コ字状に移動した後、ＳＣＲ触媒４２に導入される（図５（ａ））。続いて、図５（ｂ）に破線で示される如く、ＳＣＲ触媒４２からの排気は連通路４４を介してトラック２の前後方向に沿って移動して後段酸化触媒４６に導入され（図４）、導出ポート４８を介して筐体１８内から排出される。   As described above, in the exhaust purification apparatus 10 of the present embodiment, as indicated by the solid line in FIG. 5B, the exhaust from the engine 8 reaches the inlet side passage 26 from the introduction port 20 and reaches the upstream oxidation catalyst 28. It is introduced (FIG. 3), moves along the front-rear direction of the track 2 through the communication path 30, and is introduced into the DPF 32 (FIG. 4). Next, urea water added to the exhaust gas from the addition injector 36 moves in an inverted U shape in the order of the outlet side passage 34, the detour path 38, and the inlet side passage 40, and is then introduced into the SCR catalyst 42 (FIG. 5 (a)). Subsequently, as indicated by a broken line in FIG. 5B, the exhaust gas from the SCR catalyst 42 moves along the front-rear direction of the track 2 through the communication path 44 and is introduced into the rear-stage oxidation catalyst 46 (FIG. 4). Then, the air is discharged from the housing 18 through the outlet port 48.

以上のように、本実施形態では、前段酸化触媒２８、ＤＰＦ３２、ＳＣＲ触媒４２及び後段酸化触媒４６が束ねられて筐体１８内に収納されているのである。よって、従来に比して筐体の表面積の最小化が図られる結果、排気浄化装置の製造コストの削減も図られるし、排気浄化装置の重量が軽減され、トラック２を始めとする各種の車両への搭載性が向上する。また、筐体１８内の保温性が良好となることから、上記排気浄化手段の活性が促進されて浄化率の向上に寄与する。   As described above, in the present embodiment, the front-stage oxidation catalyst 28, the DPF 32, the SCR catalyst 42, and the rear-stage oxidation catalyst 46 are bundled and housed in the housing 18. Therefore, as a result of minimizing the surface area of the housing as compared with the conventional case, the manufacturing cost of the exhaust purification device can be reduced, the weight of the exhaust purification device can be reduced, and various vehicles including the truck 2 can be achieved. Improves mounting capability. Moreover, since the heat retaining property in the housing 18 is improved, the activity of the exhaust gas purifying means is promoted and contributes to the improvement of the purification rate.

また、ＤＰＦ３２の出口側とＳＣＲ触媒４２の入口側との間には迂回路形成板３５が設けられており、添加インジェクタ３６からのユリア水は、ＤＰＦ３２の軸線及びＳＣＲ触媒４２の軸線を含む平面に沿って最短距離でＳＣＲ触媒４２内に導入されるのではなく、車体フレーム６から視て逆コ字状、つまり、前段酸化触媒２８の軸線及び後段酸化触媒４６の軸線を含む平面側を経てからＳＣＲ触媒４２内に導入されている。従って、ユリア水の長い移動経路が確保され、ユリア水が排気中に均一に拡散され易くなり、ＮＯｘ浄化率がより一層向上する。   Further, a bypass forming plate 35 is provided between the outlet side of the DPF 32 and the inlet side of the SCR catalyst 42, and urea water from the addition injector 36 is a plane including the axis line of the DPF 32 and the axis line of the SCR catalyst 42. Is not introduced into the SCR catalyst 42 at the shortest distance along the vertical axis, but is inverted U-shaped when viewed from the vehicle body frame 6, that is, through the plane side including the axis of the front-stage oxidation catalyst 28 and the axis of the rear-stage oxidation catalyst 46. To the SCR catalyst 42. Therefore, a long movement path of urea water is secured, and urea water is easily diffused uniformly in the exhaust gas, and the NOx purification rate is further improved.

更にまた、後段酸化触媒４６がＤＰＦ３２やＳＣＲ触媒４２よりもキャブ４寄り（車両前側）に位置しており、排気導出ポート４８も車両前側に位置できるので排気浄化装置１０の後方のスペース、例えばスペアタイヤやエアタンク等の後方架装物との距離が遠くなり、これら架装物に対する熱害が回避される。
以上で本発明の一実施形態についての説明を終えるが、本発明は上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更ができるものである。 Furthermore, since the rear-stage oxidation catalyst 46 is located closer to the cab 4 (vehicle front side) than the DPF 32 and the SCR catalyst 42, and the exhaust outlet port 48 can also be located on the vehicle front side, a space behind the exhaust purification device 10, for example, a spare The distance from the rear structure such as a tire or an air tank is increased, and thermal damage to the structure is avoided.
The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

例えば、上記実施形態では、前段酸化触媒２８がキャブ４の後面近傍に配置されているが、必ずしもこの形態に限定されるものではなく、図６に示される排気浄化装置５０であっても良い（第２実施形態）。
詳しくは、当該排気浄化装置５０では、上述した導入ポート２０よりも低い位置に導入ポート７０が設けられている。そして、図６のＡ−Ａ線に沿う図７（ａ）に示される如く、前段酸化触媒２８が上記導入ポート７０に対し横向きに配置されており、ＤＰＦ３２は前段酸化触媒２８の軸線の上側にて平行に配置され、ＳＣＲ触媒４２はＤＰＦ３２の車両前側にて平行に配置されている。更に、図６のＣ−Ｃ線に沿う図８（ａ）に示される如く、後段酸化触媒４６はＳＣＲ触媒４２の下側であって前段酸化触媒２８の車両前側に前段酸化触媒２８と平行に配置されている。 For example, in the above embodiment, the front-stage oxidation catalyst 28 is disposed in the vicinity of the rear surface of the cab 4, but the present invention is not necessarily limited to this form, and the exhaust purification device 50 shown in FIG. Second embodiment).
Specifically, in the exhaust purification device 50, the introduction port 70 is provided at a position lower than the introduction port 20 described above. As shown in FIG. 7A along the line AA in FIG. 6, the front-stage oxidation catalyst 28 is disposed laterally with respect to the introduction port 70, and the DPF 32 is located above the axis of the front-stage oxidation catalyst 28. The SCR catalyst 42 is arranged in parallel on the vehicle front side of the DPF 32. Further, as shown in FIG. 8A along the line C-C in FIG. 6, the rear-stage oxidation catalyst 46 is below the SCR catalyst 42 and in front of the front-stage oxidation catalyst 28 in parallel with the front-stage oxidation catalyst 28. Has been placed.

また、排気浄化装置５０では、筐体１８内は垂直壁５２及び平行壁５４の内壁によって略４等分に分割され、この平行壁５４は、前段酸化触媒２８の入口側とＤＰＦ３２の出口側とを遮断する一方、前段酸化触媒２８の出口側とＤＰＦ３２の入口側とは遮断しない長さに構成されている（図７（ａ）、図８（ａ））。また、平行壁５４は、ＳＣＲ触媒４２の出口側と後段酸化触媒４６の入口側とも遮断しない長さに構成されている。そして、前段酸化触媒２８の入口側には導入ポート７０に連通する入口側通路２６が形成され（図７（ａ））、当該入口側通路２６は平行壁５４及び遮蔽板７５、９６によって区画されている（図６のＢ−Ｂ線に沿う図７（ｂ）、図６のＥ−Ｅ線に沿う図９（ａ））。更に、前段酸化触媒２８の出口側とＤＰＦ３２の入口側との間には連通路８０が形成され、ＳＣＲ触媒４２の出口側と後段酸化触媒４６の入口側との間にも連通路９４が形成されている。これに対し、垂直壁５２は、ＤＰＦ３２とＳＣＲ触媒４２とを遮断し、更に、連通路８０と連通路９４とを遮断する長さに構成されている（図７（ａ）、図８（ａ））。   Further, in the exhaust purification device 50, the inside of the housing 18 is divided into approximately four equal parts by the inner walls of the vertical wall 52 and the parallel wall 54. The outlet side of the pre-stage oxidation catalyst 28 and the inlet side of the DPF 32 are configured to be not cut off (FIGS. 7A and 8A). Further, the parallel wall 54 has a length that does not block both the outlet side of the SCR catalyst 42 and the inlet side of the post-stage oxidation catalyst 46. An inlet side passage 26 communicating with the introduction port 70 is formed on the inlet side of the pre-stage oxidation catalyst 28 (FIG. 7A), and the inlet side passage 26 is partitioned by the parallel wall 54 and the shielding plates 75 and 96. (FIG. 7B along the BB line in FIG. 6 and FIG. 9A along the EE line in FIG. 6). Further, a communication path 80 is formed between the outlet side of the front-stage oxidation catalyst 28 and the inlet side of the DPF 32, and a communication path 94 is also formed between the outlet side of the SCR catalyst 42 and the inlet side of the rear-stage oxidation catalyst 46. Has been. In contrast, the vertical wall 52 is configured to have a length that blocks the DPF 32 and the SCR catalyst 42 and further blocks the communication path 80 and the communication path 94 (FIGS. 7A and 8A). )).

一方、上記遮蔽板７５、９６は、その法線方向がトラック２の上下方向に立って配置されており、遮蔽板７５は、前段酸化触媒２８の入口側と後段酸化触媒４６の出口側とを覆う長さに構成されている（図７（ｂ）、図９（ａ））。これに対し、遮蔽板９６は、遮蔽板７５よりも内側に配置され、後段酸化触媒４６の出口側を覆うものの、前段酸化触媒２８の入口側を覆わない長さに構成されている。   On the other hand, the shielding plates 75 and 96 are arranged such that the normal direction thereof stands in the vertical direction of the track 2, and the shielding plate 75 has an inlet side of the front-stage oxidation catalyst 28 and an outlet side of the rear-stage oxidation catalyst 46. It is configured to cover the length (FIGS. 7B and 9A). On the other hand, the shielding plate 96 is arranged on the inner side of the shielding plate 75 and has a length that covers the outlet side of the rear-stage oxidation catalyst 46 but does not cover the inlet side of the front-stage oxidation catalyst 28.

そして、ＤＰＦ３２の出口側通路８４とＳＣＲ触媒４２の入口側通路９０との間には迂回路形成板（迂回路形成部）８５が配置されている。図８（ｂ）に示されるように、迂回路形成板８５は、導出ポート４８を備えた筐体１８の面とは反対側の面の内側部分からトラック２の高さ方向に沿って延びて平行壁５４を超え、遮蔽板７５の向こう側に配置された前段酸化触媒２８及び後段酸化触媒４６の各軸線を含む平面近傍の位置にまで達する長さに構成されている。これにより、出口側通路８４と入口側通路９０との間にはユリア水の迂回路８８が形成される。   A detour forming plate (detour forming unit) 85 is disposed between the outlet side passage 84 of the DPF 32 and the inlet side passage 90 of the SCR catalyst 42. As shown in FIG. 8B, the detour formation plate 85 extends along the height direction of the track 2 from the inner portion of the surface opposite to the surface of the housing 18 provided with the outlet port 48. The length is such that it extends beyond the parallel wall 54 and reaches a position near the plane including the axes of the front-stage oxidation catalyst 28 and the rear-stage oxidation catalyst 46 disposed on the other side of the shielding plate 75. Thereby, a detour 88 of urea water is formed between the outlet side passage 84 and the inlet side passage 90.

このように、本実施形態の排気浄化装置５０においては、図９（ｂ）に実線で示される如く、エンジン８からの排気は、導入ポート７０から入口側通路２６に達して前段酸化触媒２８に導入され（図７）、連通路８０を介してトラック２の上下方向に沿って移動してＤＰＦ３２に導入される（図７（ｂ）、図８（ａ））。次いで、添加インジェクタ３６から排気中に添加されたユリア水は、出口側通路８４、迂回路８８及び入口側通路９０の順にて本体フレーム６から視てＵ字状に移動した後、ＳＣＲ触媒４２に導入される（図８（ｂ））。続いて、ＳＣＲ触媒４２からの排気は連通路９４を介してトラック２の上下方向に沿って移動して後段酸化触媒４６に導入され（図９（ａ））、導出ポート４８を介して筐体１８内から排出される。   As described above, in the exhaust purification device 50 of the present embodiment, as indicated by the solid line in FIG. 9B, the exhaust from the engine 8 reaches the inlet side passage 26 from the introduction port 70 and reaches the upstream oxidation catalyst 28. It is introduced (FIG. 7), moved along the vertical direction of the track 2 via the communication path 80, and introduced into the DPF 32 (FIGS. 7B and 8A). Next, urea water added to the exhaust gas from the addition injector 36 moves in a U shape as viewed from the main body frame 6 in the order of the outlet side passage 84, the detour 88 and the inlet side passage 90, and then enters the SCR catalyst 42. It is introduced (FIG. 8 (b)). Subsequently, the exhaust gas from the SCR catalyst 42 moves along the vertical direction of the track 2 via the communication path 94 and is introduced into the rear-stage oxidation catalyst 46 (FIG. 9A). 18 is discharged from the inside.

従って、本実施形態によれば、エンジン８側の制約等によって導入ポート７０を低い位置に設けたい場合にも対応可能となり、この場合にも、後段酸化触媒４６がＤＰＦ３２や前段酸化触媒２８よりも前方に位置し、導出ポート４８も車両前側に位置できるので、後方架装物に対する熱害が回避可能となる。
ところで、上記各実施形態では、４つの排気浄化手段の各軸線がトラック２の幅方向に沿って並列に配置されているが、４つの排気浄化手段の各軸線がトラック２の前後方向に沿って並列に配置されていても良い。また、立方体の筐体において、各外周面の中点を結んだ垂直壁や平行壁によって筐体内を区画する他、対向する角を結んで互いに直交する壁によって筐体内を区画しても良い。そして、これらの場合にも、車両への搭載性及び筐体内の保温性の向上を図ることができるとの効果を奏する。 Therefore, according to the present embodiment, it is possible to cope with the case where the introduction port 70 is desired to be provided at a low position due to restrictions on the engine 8 side. Since it is located in the front and the lead-out port 48 can also be located on the front side of the vehicle, it is possible to avoid heat damage to the rear body.
By the way, in each of the above-described embodiments, the axes of the four exhaust purification means are arranged in parallel along the width direction of the track 2, but the axes of the four exhaust purification means extend along the front-rear direction of the track 2. You may arrange | position in parallel. Further, in the cubic housing, the inside of the housing may be partitioned by vertical walls or parallel walls connecting the midpoints of the respective outer peripheral surfaces, or may be partitioned by walls orthogonal to each other by connecting opposite corners. And also in these cases, there exists an effect that the mounting property to a vehicle and the heat retention in a housing | casing can be aimed at.

更に、上記各実施形態では、ディーゼルエンジンに適用された排気浄化装置について説明されているが、当該エンジンに限定されるものではなく、本発明は、ＤＰＦとＳＣＲ触媒とを備えた総てのエンジンに適用可能である。   Furthermore, in each said embodiment, although the exhaust gas purification apparatus applied to the diesel engine is demonstrated, it is not limited to the said engine, This invention is all engines provided with DPF and SCR catalyst. It is applicable to.

本発明の一実施形態に係る内燃機関の排気浄化装置を搭載した車両の概略図である。1 is a schematic view of a vehicle equipped with an exhaust gas purification apparatus for an internal combustion engine according to an embodiment of the present invention. 図１の排気浄化装置の外観斜視図である。It is an external appearance perspective view of the exhaust gas purification apparatus of FIG. 図２のＡ−Ａ線及びＢ−Ｂ線に沿う矢視断面図である。It is arrow sectional drawing which follows the AA line and BB line of FIG. 図２のＣ−Ｃ線及びＤ−Ｄ線に沿う矢視断面図である。It is arrow sectional drawing which follows the CC line and DD line of FIG. 図２のＥ−Ｅ線に沿う矢視断面図、並びに排気流れの説明図である。FIG. 3 is a cross-sectional view taken along line EE in FIG. 2 and an explanatory diagram of an exhaust flow. 他の実施形態による排気浄化装置の外観斜視図である。It is an external appearance perspective view of the exhaust gas purification apparatus by other embodiment. 図６のＡ−Ａ線及びＢ−Ｂ線に沿う矢視断面図である。It is arrow sectional drawing which follows the AA line and BB line of FIG. 図６のＣ−Ｃ線及びＤ−Ｄ線に沿う矢視断面図である。It is arrow sectional drawing along the CC line and DD line of FIG. 図６のＥ−Ｅ線に沿う矢視断面図、並びに排気流れの説明図である。It is arrow sectional drawing along the EE line | wire of FIG. 6, and explanatory drawing of an exhaust flow.

符号の説明Explanation of symbols

８ 内燃機関
１０，５０ 排気浄化装置
１８ 筐体
２８ 前段酸化触媒
３２ ＤＰＦ（パティキュレートフィルタ）
３５，８５ 迂回路形成板（迂回路形成部）
３６ 添加インジェクタ（添加手段）
４２ ＳＣＲ触媒（選択還元型ＮＯｘ触媒）
４６ 後段酸化触媒 8 Internal combustion engine 10, 50 Exhaust gas purification device 18 Case 28 Pre-stage oxidation catalyst 32 DPF (particulate filter)
35,85 detour formation plate (detour formation section)
36 Additive injector (additive means)
42 SCR catalyst (selective reduction NOx catalyst)
46 Second-stage oxidation catalyst

Claims (3)

内燃機関からの排気が導入される筐体と、
前記筐体の内部を格子状に４つの室に区切るとともに前記内燃機関からの排気が前記４つの各室を順次流れるように配設された内壁とを備え、
前記筐体内における排気流れの上流側に位置する室から順に、前段酸化触媒、パティキュレートフィルタ、ユリア水の添加によって排気中のＮＯｘを浄化する選択還元型ＮＯｘ触媒、および後段酸化触媒が収納されていることを特徴とする内燃機関の排気浄化装置。 A housing into which exhaust from the internal combustion engine is introduced;
The interior of the housing is divided into four chambers in a lattice shape and includes an inner wall disposed so that exhaust from the internal combustion engine flows through the four chambers sequentially,
In order from the chamber located upstream of the exhaust flow in the casing, a pre-stage oxidation catalyst, a particulate filter, a selective reduction type NOx catalyst that purifies NOx in exhaust gas by adding urea water, and a post-stage oxidation catalyst are housed. An exhaust emission control device for an internal combustion engine. 前記筐体は、前記パティキュレートフィルタの出口近傍位置にて前記ユリア水を添加する添加手段と、前記パティキュレートフィルタから排出された排気が隣り合う前記選択還元型ＮＯｘ触媒に流れる際に前記前段酸化触媒の軸線および前記後段酸化触媒の軸線を含む平面近傍の位置まで迂回させる迂回路形成部とを備えていることを特徴とする請求項１に記載の内燃機関の排気浄化装置。   The casing includes the addition means for adding the urea water at a position near the outlet of the particulate filter, and the pre-oxidation when exhaust discharged from the particulate filter flows to the adjacent selective reduction type NOx catalyst. 2. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, further comprising: a detour forming unit configured to detour to a position near a plane including the axis of the catalyst and the axis of the second-stage oxidation catalyst. 前記筐体内に前段酸化触媒、パティキュレートフィルタ、選択還元型ＮＯｘ触媒、および後段酸化触媒の排気流れ方向が車両前後方向に対して略直交方向となるように各々配置され、前記後段酸化触媒が前記筐体の区切られた室のうちの車両前側で且つ下段に位置する室に配置されたことを特徴とする請求項１又は２に記載の内燃機関の排気浄化装置。   The front-stage oxidation catalyst, the particulate filter, the selective reduction type NOx catalyst, and the rear-stage oxidation catalyst are arranged in the casing so that the exhaust flow directions thereof are substantially perpendicular to the vehicle front-rear direction. The exhaust gas purification apparatus for an internal combustion engine according to claim 1 or 2, wherein the exhaust gas purification apparatus for an internal combustion engine according to claim 1 or 2, wherein the exhaust gas purification apparatus is disposed in a chamber located on a front side of the vehicle and in a lower stage among the chambers defined by the casing.
JP2005224040A 2005-08-02 2005-08-02 Exhaust emission control device of internal combustion engine Withdrawn JP2007040149A (en)

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