JP2007127064A - Exhaust emission control device for internal combustion engine - Google Patents

Exhaust emission control device for internal combustion engine Download PDF

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JP2007127064A
JP2007127064A JP2005320785A JP2005320785A JP2007127064A JP 2007127064 A JP2007127064 A JP 2007127064A JP 2005320785 A JP2005320785 A JP 2005320785A JP 2005320785 A JP2005320785 A JP 2005320785A JP 2007127064 A JP2007127064 A JP 2007127064A
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exhaust
catalyst device
sub
internal combustion
combustion engine
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JP4477570B2 (en
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Shigeki Miyashita
茂樹 宮下
Masakazu Yamamoto
正和 山本
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Denso Corp
Toyota Motor Corp
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Denso Corp
Toyota Motor Corp
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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
    • F01N3/18—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
    • 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
    • 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
    • F01N13/0093—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 of the same type
    • 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
    • F01N13/011—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 purifying devices arranged in parallel
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/107—More than one exhaust manifold or exhaust collector
    • 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
    • F01N3/101—Three-way 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
    • F01N3/105—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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/108—Auxiliary reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • F02D17/023—Cutting-out the inactive cylinders acting as compressor other than for pumping air into the exhaust system
    • 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
    • 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
    • F01N2340/02—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the distance of the apparatus to the engine, or the distance between two exhaust treating apparatuses
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Silencers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To improve deterioration of exhaust emission at a time of engine start and deterioration of fuel consumption during partial cylinder operation in an exhaust emission control device for an internal combustion engine separating all cylinders of a multiple cylinder internal combustion engine into two cylinder groups, provided with exhaust passages to each cylinder group from an exhaust manifold to an exhaust merging part, and provided with a main catalyst device on a downstream side of the exhaust merging part. <P>SOLUTION: A first auxiliary catalyst device 9a is arranged in one 6a of two exhaust passages on an upstream side of the exhaust merging part 7, a second auxiliary catalyst device 9b is arranged in another 6b of two exhaust passages. Quantity of catalyst carried by the second auxiliary catalyst device is kept smaller than quantity of catalyst carried by the first auxiliary catalyst device. The engine is operated by only one cylinder group 1a corresponding to one exhaust passage at a time of engine start. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、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.

例えばＶ型内燃機関のような多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれに排気マニホルドを設ける場合には、各排気マニホルドから排気合流部までは、気筒群毎に排気通路が設けられる。排気合流部の下流側には、主触媒装置が配置され、機関高負荷時の多量の排気ガスを浄化することができる。しかしながら、主触媒装置は、機関本体から遠くに位置するために、排気ガスが温度低下して流入することとなり、機関低負荷時のように元々の排気ガス温度が低いと、かなり低温度の排気ガスが主触媒装置へ流入して触媒活性化程度を悪化させ、排気ガスを十分に浄化することができなくなる。従って、機関低負荷時の排気ガスを浄化するためには、機関本体からそれほど遠くない位置に副触媒装置を配置することが必要となる。   For example, when all the cylinders of a multi-cylinder internal combustion engine such as a V-type internal combustion engine are divided into two cylinder groups and each is provided with an exhaust manifold, an exhaust passage is provided for each cylinder group from each exhaust manifold to the exhaust junction. Is provided. A main catalyst device is disposed on the downstream side of the exhaust merging portion, and a large amount of exhaust gas at the time of high engine load can be purified. However, since the main catalyst device is located far from the engine body, the exhaust gas flows in at a reduced temperature. If the original exhaust gas temperature is low, such as when the engine is under a low load, the exhaust gas at a considerably low temperature is used. The gas flows into the main catalyst device to deteriorate the degree of catalyst activation, and the exhaust gas cannot be sufficiently purified. Therefore, in order to purify the exhaust gas at the time of low engine load, it is necessary to dispose the sub-catalyst device at a position not far from the engine body.

副触媒装置を二つの排気通路の一方だけに配置して、機関低負荷時には、副触媒装置が配置された一方の排気通路に対応する気筒群だけを運転する（一部気筒運転）ことが提案されている（例えば、特許文献１参照）。   Proposed to place the sub-catalyst device in only one of the two exhaust passages and operate only the cylinder group corresponding to the one exhaust passage in which the sub-catalyst device is placed when the engine is under low load (partial cylinder operation) (For example, refer to Patent Document 1).

特開平７−１３３７１６JP-A-7-133716 特開２００１−２２７３６９JP 2001-227369 A

前述の技術では、機関始動時において全気筒運転が実施されると、副触媒装置が配置されていない他方の排気通路に対応する気筒群から排出される排気ガスは、機関始動時において主触媒装置の触媒が活性化していないために、殆ど浄化されることなく大気中へ放出されてしまう。また、一部気筒運転から全気筒運転へ切り換えられた直後から主触媒装置での排気ガスの浄化を可能とするために、一部気筒運転中において運転気筒の燃焼空燃比をリッチにして、このリッチ空燃比の排気ガス中に含まれる未燃燃料を非運転気筒から排出される空気に含まれる酸素によって主触媒装置で燃焼させることにより主触媒装置を触媒活性化温度に維持することも提案されているが、これでは、一部気筒運転において運転気筒の燃料消費が悪化してしまう。   In the above-described technique, when all cylinders are operated at the time of starting the engine, the exhaust gas discharged from the cylinder group corresponding to the other exhaust passage in which the sub-catalyst device is not disposed is the main catalyst device at the time of starting the engine. Since the catalyst is not activated, it is released into the atmosphere with almost no purification. In addition, in order to enable exhaust gas purification in the main catalyst device immediately after switching from partial cylinder operation to full cylinder operation, the combustion air-fuel ratio of the operating cylinder is made rich during partial cylinder operation. It has also been proposed to maintain the main catalyst device at the catalyst activation temperature by burning the unburned fuel contained in the rich air-fuel ratio exhaust gas with oxygen contained in the air discharged from the non-operating cylinder in the main catalyst device. However, in this case, the fuel consumption of the operating cylinder is deteriorated in the partial cylinder operation.

従って、本発明の目的は、多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒群毎に排気通路が設けられ、排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、機関始動時の排気エミッションの悪化及び一部気筒運転時の燃料消費の悪化を改善することである。   Accordingly, an object of the present invention is to divide all the cylinders of a multi-cylinder internal combustion engine into two cylinder groups, and provide an exhaust passage for each cylinder group from each exhaust manifold to the exhaust merging portion, downstream of the exhaust merging portion. In the exhaust emission control device for an internal combustion engine in which the main catalyst device is arranged, it is to improve the deterioration of exhaust emission at the time of engine start and the deterioration of fuel consumption at the time of partial cylinder operation.

本発明による請求項１に記載の内燃機関の排気浄化装置は、多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、二つの前記排気通路の他方には第二副触媒装置が配置され、前記第二副触媒装置の触媒担持量は、前記第一副触媒装置の触媒担持量より少なくされ、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする。   According to a first aspect of the present invention, there is provided an exhaust emission control device for an internal combustion engine, wherein all cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to an exhaust merge section. In the exhaust gas purification apparatus for an internal combustion engine provided with a main catalyst device downstream of the exhaust gas merging portion, a first sub catalyst device is provided in one of the two exhaust passages upstream of the exhaust gas merging portion. A second sub-catalyst device is disposed in the other of the two exhaust passages, and the amount of the catalyst supported by the second sub-catalyst device is less than the amount of the catalyst supported by the first sub-catalyst device. Only the cylinder group corresponding to the one exhaust passage is operated.

本発明による請求項２に記載の内燃機関の排気浄化装置は、多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、二つの前記排気通路の他方には第二副触媒装置が配置され、前記第一副触媒装置の熱容量は、前記第二副触媒装置の熱容量より小さくされ、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする。   According to a second aspect of the present invention, there is provided an exhaust gas purification apparatus for an internal combustion engine, wherein all cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to an exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine provided with a main catalyst device downstream of the exhaust gas merging portion, a first sub catalyst device is provided in one of the two exhaust passages upstream of the exhaust gas merging portion. A second sub-catalyst device is disposed on the other of the two exhaust passages, and the heat capacity of the first sub-catalyst device is made smaller than the heat capacity of the second sub-catalyst device. Only the cylinder group corresponding to the exhaust passage is operated.

本発明による請求項３に記載の内燃機関の排気浄化装置は、多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、二つの前記排気通路の他方には第二副触媒装置が配置され、前記第一副触媒装置の触媒は、前記第二副触媒装置の触媒より低温活性とされ、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする。   According to a third aspect of the present invention, there is provided an exhaust purification system for an internal combustion engine, wherein all cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to an exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine provided with a main catalyst device downstream of the exhaust gas merging portion, a first sub catalyst device is provided in one of the two exhaust passages upstream of the exhaust gas merging portion. A second sub-catalyst device is disposed in the other of the two exhaust passages, and the catalyst of the first sub-catalyst device is activated at a lower temperature than the catalyst of the second sub-catalyst device, and when the engine is started, Only the cylinder group corresponding to one exhaust passage is operated.

本発明による請求項４に記載の内燃機関の排気浄化装置は、多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、二つの前記排気通路の他方には第二副触媒装置が配置され、対応する排気マニホルドから前記第一副触媒装置までの排気経路長は、対応する排気マニホルドから前記第二副触媒装置までの排気経路長より短くされ、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする。   According to a fourth aspect of the present invention, there is provided an exhaust emission control device for an internal combustion engine, wherein all cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to an exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine provided with a main catalyst device downstream of the exhaust gas merging portion, a first sub catalyst device is provided in one of the two exhaust passages upstream of the exhaust gas merging portion. A second sub-catalyst device is disposed in the other of the two exhaust passages, and an exhaust path length from the corresponding exhaust manifold to the first sub-catalyst device is from the corresponding exhaust manifold to the second sub-catalyst device. The length of the exhaust path is shorter than that until the engine is started, and only the cylinder group corresponding to the one exhaust path is operated.

本発明による請求項５に記載の内燃機関の排気浄化装置は、請求項４に記載の内燃機関の排気浄化装置において、前記第二副触媒装置は、前記排気合流部の直上流側において前記他方の排気通路に配置されていることを特徴とする。   An internal combustion engine exhaust gas purification apparatus according to a fifth aspect of the present invention is the internal combustion engine exhaust gas purification apparatus according to the fourth aspect, wherein the second sub-catalyst device is located on the other side immediately upstream of the exhaust gas merging portion. It is arrange | positioned in the exhaust passage of this.

本発明による請求項６に記載の内燃機関の排気浄化装置は、多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、前記排気合流部の直下流側には第二副触媒装置が配置され、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする。   According to a sixth aspect of the present invention, there is provided an exhaust gas purification apparatus for an internal combustion engine, wherein all cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to an exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine provided with a main catalyst device downstream of the exhaust gas merging portion, a first sub catalyst device is provided in one of the two exhaust passages upstream of the exhaust gas merging portion. The second sub-catalyst device is disposed immediately downstream of the exhaust merging portion, and only the cylinder group corresponding to the one exhaust passage is operated when the engine is started.

本発明による請求項１に記載の内燃機関の排気浄化装置によれば、排気合流部の上流側の二つの排気通路の一方には第一副触媒装置が配置され、二つの排気通路の他方には第二副触媒装置が配置され、第二副触媒装置の触媒担持量は、第一副触媒装置の触媒担持量より少なくされ、機関始動時には、一方の排気通路に対応する気筒群だけを運転するようになっている。それにより、機関始動時における一部気筒運転の排気ガスは、機関本体近くの一方の排気通路に配置されているために早期に触媒が活性化すると共に、触媒担持量の多い第一副触媒装置によって良好に浄化され、機関始動時の排気エミッションが悪化することはない。   According to the exhaust gas purification apparatus for an internal combustion engine according to the first aspect of the present invention, the first auxiliary catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and the other of the two exhaust passages. Is equipped with a second sub-catalyst device, the amount of catalyst supported by the second sub-catalyst device is less than the amount of catalyst supported by the first sub-catalyst device, and only the cylinder group corresponding to one exhaust passage is operated when the engine is started. It is supposed to be. As a result, the exhaust gas of the partial cylinder operation at the time of engine start is arranged in one exhaust passage near the engine body, so that the catalyst is activated early and the first auxiliary catalyst device with a large amount of catalyst supported Therefore, the exhaust emission at the time of starting the engine is not deteriorated.

また、一部気筒運転から全気筒運転へ切り換えられる際には、他方の排気通路に対応する気筒群の運転が開始されるが、機関本体近くの他方の排気通路には第二副触媒装置が配置されており、この時までには機関本体からの排気通路を介する伝熱により第二副触媒装置の温度は機関始動時に比較すれば上昇していているために、運転開始後直ぐに触媒が活性化して排気ガスを浄化することができる。こうして、一部気筒運転において主触媒装置を比較的高温度に維持するために燃焼空燃比をリッチにする必要はなく、一部気筒運転時の燃料消費の悪化を改善することができる。また、他方の排気通路に配置された第二副触媒装置は、未燃燃料等を比較的多く含む機関始動時の排気ガスを浄化する必要はないために、第一副触媒装置に比較して触媒担持量を少なくしており、それにより、第一副触媒装置と同様な高価な副触媒装置を他方の排気通路にも配置する場合に比較して、排気浄化装置のコストアップを抑制することができる。   Further, when switching from partial cylinder operation to full cylinder operation, the operation of the cylinder group corresponding to the other exhaust passage is started, but the second sub-catalyst device is provided in the other exhaust passage near the engine body. By this time, the temperature of the second sub-catalyst device has risen compared to the time when the engine is started due to heat transfer from the engine body through the exhaust passage, so that the catalyst is activated immediately after the start of operation. And exhaust gas can be purified. Thus, it is not necessary to make the combustion air-fuel ratio rich in order to maintain the main catalyst device at a relatively high temperature in the partial cylinder operation, and the deterioration of fuel consumption during the partial cylinder operation can be improved. Further, the second sub-catalyst device arranged in the other exhaust passage does not need to purify the exhaust gas at the time of starting the engine, which contains a relatively large amount of unburned fuel, etc. The amount of catalyst supported is reduced, thereby suppressing an increase in the cost of the exhaust purification device compared to the case where an expensive sub catalyst device similar to the first sub catalyst device is also arranged in the other exhaust passage. Can do.

本発明による請求項２に記載の内燃機関の排気浄化装置によれば、排気合流部の上流側の二つの排気通路の一方には第一副触媒装置が配置され、二つの排気通路の他方には第二副触媒装置が配置され、第一副触媒装置の熱容量は、第二副触媒装置の熱容量より小さくされ、機関始動時には、一方の排気通路に対応する気筒群だけを運転するようになっている。それにより、機関始動時における一部気筒運転の排気ガスは、機関本体近くの一方の排気通路に配置されているだけでなく熱容量を小さくされているためにさらに早期に触媒が活性化する第一副触媒装置によって良好に浄化され、機関始動時の排気エミッションが悪化することはない。   According to the exhaust gas purification apparatus for an internal combustion engine according to the second aspect of the present invention, the first sub catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and the other of the two exhaust passages is disposed. The second sub-catalyst device is arranged, and the heat capacity of the first sub-catalyst device is made smaller than the heat capacity of the second sub-catalyst device, and when starting the engine, only the cylinder group corresponding to one exhaust passage is operated. ing. As a result, the exhaust gas of the partial cylinder operation at the time of starting the engine is not only arranged in one exhaust passage near the engine body but also has a reduced heat capacity, so that the catalyst is activated earlier. The sub-catalyst device is well purified and the exhaust emission at the start of the engine does not deteriorate.

また、一部気筒運転から全気筒運転へ切り換えられる際には、他方の排気通路に対応する気筒群の運転が開始されるが、機関本体近くの他方の排気通路には第二副触媒装置が配置されており、この時までには機関本体からの排気通路を介する伝熱により第二副触媒装置の温度は機関始動時に比較すれば上昇していているために、運転開始後直ぐに触媒が活性化して排気ガスを浄化することができる。こうして、一部気筒運転において主触媒装置を比較的高温度に維持するために燃焼空燃比をリッチにする必要はなく、一部気筒運転時の燃料消費の悪化を改善することができる。また、他方の排気通路に配置された第二副触媒装置は、機関始動時の排気ガスを浄化する必要はないために、高価な材料を使用して第一副触媒装置のように低熱容量化しなくても良く、それにより、第一副触媒装置と同様な高価な副触媒装置を他方の排気通路にも配置する場合に比較して、排気浄化装置のコストアップを抑制することができる。   Further, when switching from partial cylinder operation to full cylinder operation, the operation of the cylinder group corresponding to the other exhaust passage is started, but the second sub-catalyst device is provided in the other exhaust passage near the engine body. By this time, the temperature of the second sub-catalyst device has risen compared to the time when the engine is started due to heat transfer from the engine body through the exhaust passage, so that the catalyst is activated immediately after the start of operation. And exhaust gas can be purified. Thus, it is not necessary to make the combustion air-fuel ratio rich in order to maintain the main catalyst device at a relatively high temperature in the partial cylinder operation, and the deterioration of fuel consumption during the partial cylinder operation can be improved. In addition, since the second sub-catalyst device arranged in the other exhaust passage does not need to purify the exhaust gas at the time of starting the engine, the second sub-catalyst device uses an expensive material to reduce the heat capacity like the first sub-catalyst device. Accordingly, it is possible to suppress an increase in the cost of the exhaust emission control device as compared with a case where an expensive sub catalyst device similar to the first sub catalyst device is also disposed in the other exhaust passage.

本発明による請求項３に記載の内燃機関の排気浄化装置によれば、排気合流部の上流側の二つの排気通路の一方には第一副触媒装置が配置され、二つの排気通路の他方には第二副触媒装置が配置され、第一副触媒装置の触媒は、第二副触媒装置の触媒より低温活性とされ、機関始動時には、一方の排気通路に対応する気筒群だけを運転するようになっている。それにより、機関始動時における一部気筒運転の排気ガスは、機関本体近くの一方の排気通路に配置されているだけでなく低温活性の触媒を担持してさらに早期に触媒が活性化する第一副触媒装置によって良好に浄化され、機関始動時の排気エミッションが悪化することはない。   According to the exhaust gas purification apparatus for an internal combustion engine according to the third aspect of the present invention, the first auxiliary catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and the other of the two exhaust passages is disposed. Is provided with a second sub-catalyst device, the catalyst of the first sub-catalyst device is activated at a lower temperature than the catalyst of the second sub-catalyst device, and when starting the engine, only the cylinder group corresponding to one exhaust passage is operated. It has become. Thereby, the exhaust gas of the partial cylinder operation at the time of starting the engine is not only arranged in one exhaust passage near the engine body, but also carries a low-temperature active catalyst, and the catalyst is activated earlier. The sub-catalyst device is well purified and the exhaust emission at the start of the engine does not deteriorate.

また、一部気筒運転から全気筒運転へ切り換えられる際には、他方の排気通路に対応する気筒群の運転が開始されるが、機関本体近くの他方の排気通路には第二副触媒装置が配置されており、この時までには機関本体からの排気通路を介する伝熱により第二副触媒装置の温度は機関始動時に比較すれば上昇していているために、運転開始後直ぐに触媒が活性化して排気ガスを浄化することができる。こうして、一部気筒運転において主触媒装置を比較的高温度に維持するために燃焼空燃比をリッチにする必要はなく、一部気筒運転時の燃料消費の悪化を改善することができる。また、他方の排気通路に配置された第二副触媒装置は、機関始動時の排気ガスを浄化する必要はないために、第一副触媒装置のように高価な低温活性の触媒を担持しなくても良く、それにより、第一副触媒装置と同様な高価な副触媒装置を他方の排気通路にも配置する場合に比較して、排気浄化装置のコストアップを抑制することができる。   Further, when switching from partial cylinder operation to full cylinder operation, the operation of the cylinder group corresponding to the other exhaust passage is started, but the second sub-catalyst device is provided in the other exhaust passage near the engine body. By this time, the temperature of the second sub-catalyst device has risen compared to the time when the engine is started due to heat transfer from the engine body through the exhaust passage, so that the catalyst is activated immediately after the start of operation. And exhaust gas can be purified. Thus, it is not necessary to make the combustion air-fuel ratio rich in order to maintain the main catalyst device at a relatively high temperature in the partial cylinder operation, and the deterioration of fuel consumption during the partial cylinder operation can be improved. Further, the second sub-catalyst device arranged in the other exhaust passage does not need to purify the exhaust gas at the time of starting the engine, and therefore does not carry an expensive low-temperature active catalyst like the first sub-catalyst device. As a result, it is possible to suppress an increase in the cost of the exhaust emission control device as compared with a case where an expensive sub catalyst device similar to the first sub catalyst device is also disposed in the other exhaust passage.

本発明による請求項４に記載の内燃機関の排気浄化装置は、排気合流部の上流側の二つの排気通路の一方には第一副触媒装置が配置され、二つの排気通路の他方には第二副触媒装置が配置され、対応する排気マニホルドから第一副触媒装置までの排気経路長は、対応する排気マニホルドから第二副触媒装置までの排気経路長より短くされ、機関始動時には、一方の排気通路に対応する気筒群だけを運転するようになっている。それにより、機関始動時における一部気筒運転の排気ガスは、機関本体近くの一方の排気通路における排気マニホルドまでの排気経路長が短い位置に配置されて早期に触媒が活性化する第一副触媒装置によって良好に浄化され、機関始動時の排気エミッションが悪化することはない。   According to a fourth aspect of the present invention, there is provided an exhaust gas purification apparatus for an internal combustion engine, wherein the first sub-catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and the second exhaust passage is disposed in the other. Two sub-catalyst devices are arranged, and the exhaust path length from the corresponding exhaust manifold to the first sub-catalyst device is made shorter than the exhaust path length from the corresponding exhaust manifold to the second sub-catalyst device. Only the cylinder group corresponding to the exhaust passage is operated. As a result, the exhaust gas of the partial cylinder operation when starting the engine is arranged at a position where the exhaust path length to the exhaust manifold in one exhaust passage near the engine main body is short, and the catalyst is activated early. It is cleaned well by the device, and the exhaust emission at the start of the engine is not deteriorated.

また、一部気筒運転から全気筒運転へ切り換えられる際には、他方の排気通路に対応する気筒群の運転が開始されるが、機関本体近くの他方の排気通路には第二副触媒装置が配置されており、この時までには機関本体からの排気通路を介する伝熱により第二副触媒装置の温度は機関始動時に比較すれば上昇していているために、運転開始後直ぐに触媒が活性化して排気ガスを浄化することができる。こうして、一部気筒運転において主触媒装置を比較的高温度に維持するために燃焼空燃比をリッチにする必要はなく、一部気筒運転時の燃料消費の悪化を改善することができる。   Further, when switching from partial cylinder operation to full cylinder operation, the operation of the cylinder group corresponding to the other exhaust passage is started, but the second sub-catalyst device is provided in the other exhaust passage near the engine body. By this time, the temperature of the second sub-catalyst device has risen compared to the time when the engine is started due to heat transfer from the engine body through the exhaust passage, so that the catalyst is activated immediately after the start of operation. And exhaust gas can be purified. Thus, it is not necessary to make the combustion air-fuel ratio rich in order to maintain the main catalyst device at a relatively high temperature in the partial cylinder operation, and the deterioration of fuel consumption during the partial cylinder operation can be improved.

また、他方の排気通路に配置された第二副触媒装置の排気マニホルドまでの排気経路長は、一方の排気通路に配置された第一副触媒装置の排気マニホルドまでの排気経路長より長くされている。機関高負荷運転時等において気筒から排出される排気ガス温度が非常に高くなると、排気マニホルドまでの排気経路長が短くされた第一副触媒装置へは非常に高温度のまま排気ガスが流入して第一副触媒装置を溶損させる危険があるために、対応する気筒群の燃焼空燃比をリッチにして気筒から排出される排気ガス温度を低下させる必要がある。これに対して、排気マニホルドまでの排気経路長が長くされた第二副触媒装置へは、ある程度は温度低下した排気ガスしか流入せず、そのままでも溶損の危険が少ないために、対応する気筒群の燃焼空燃比をリッチにする機会を減少することができる。こうして、第一副触媒装置と同様な短い排気経路長として他方の排気通路に第二副触媒装置を配置する場合に比較して、溶損を防止するリッチ化での燃料消費を低減することができる。   Also, the exhaust path length to the exhaust manifold of the second sub-catalyst device arranged in the other exhaust passage is made longer than the exhaust path length to the exhaust manifold of the first sub-catalyst device arranged in one exhaust passage. Yes. If the exhaust gas temperature exhausted from the cylinder becomes extremely high during high engine load operation, etc., the exhaust gas flows into the first sub-catalyst device in which the exhaust path length to the exhaust manifold is shortened at a very high temperature. Therefore, it is necessary to reduce the temperature of the exhaust gas discharged from the cylinder by making the combustion air-fuel ratio of the corresponding cylinder group rich so that there is a risk of melting the first auxiliary catalyst device. On the other hand, since only the exhaust gas whose temperature has been lowered to a certain extent flows into the second auxiliary catalyst device having a long exhaust path length to the exhaust manifold, there is little risk of erosion, so the corresponding cylinder Opportunities to enrich the combustion air-fuel ratio of the group can be reduced. Thus, compared to the case where the second sub-catalyst device is arranged in the other exhaust passage with a short exhaust path length similar to that of the first sub-catalyst device, the fuel consumption in the enrichment that prevents melting damage can be reduced. it can.

本発明による請求項５に記載の内燃機関の排気浄化装置によれば、請求項４の内燃機関の排気浄化装置において、第二副触媒装置は、排気合流部の直上流側において他方の排気通路に配置されている。それにより、請求項４に記載の内燃機関の排気浄化装置と同様な効果が得られると共に、一部気筒運転時において、一方の排気通路を通過する排気ガスの一部が排気合流部を介して第二副触媒装置内へ流入するために、全気筒運転に備えて、第二副触媒装置の温度をさらに高めることができる。   According to the exhaust gas purification apparatus for an internal combustion engine according to claim 5 of the present invention, in the exhaust gas purification apparatus for the internal combustion engine according to claim 4, the second sub-catalyst device is the other exhaust passage on the upstream side of the exhaust merging portion. Is arranged. Thus, the same effect as that of the exhaust gas purification apparatus for an internal combustion engine according to claim 4 can be obtained, and at the time of partial cylinder operation, a part of the exhaust gas that passes through one exhaust passage passes through the exhaust junction. In order to flow into the second sub catalyst device, the temperature of the second sub catalyst device can be further increased in preparation for all cylinder operation.

本発明による請求項６に記載の内燃機関の排気浄化装置によれば、排気合流部の上流側の二つの排気通路の一方には第一副触媒装置が配置され、排気合流部の直下流側には第二副触媒装置が配置され、機関始動時には、一方の排気通路に対応する気筒群だけを運転するようになっている。それにより、機関始動時における一部気筒運転の排気ガスは、機関本体近くの一方の排気通路に配置されて早期に触媒が活性化する第一副触媒装置によって良好に浄化され、機関始動時の排気エミッションが悪化することはない。   According to the exhaust gas purification apparatus for an internal combustion engine according to claim 6 of the present invention, the first sub-catalyst device is disposed in one of the two exhaust passages on the upstream side of the exhaust gas merging portion, and directly downstream of the exhaust gas merging portion. Is provided with a second sub-catalyst device, and when the engine is started, only the cylinder group corresponding to one exhaust passage is operated. As a result, the exhaust gas of the partial cylinder operation at the time of engine start is well purified by the first sub-catalyst device that is arranged in one exhaust passage near the engine body and activates the catalyst at an early stage. Exhaust emissions will not deteriorate.

また、一部気筒運転から全気筒運転へ切り換えられる際には、他方の排気通路に対応する気筒群の運転が開始されるが、一部気筒運転中において、一方の排気通路を通過する排気ガスは排気合流部の直下流側の第二副触媒装置内へも流入して第二副触媒装置の温度を機関始動時に比較すればかなり高めているために、運転開始後直ぐに触媒が活性化して排気ガスを浄化することができる。こうして、一部気筒運転において主触媒装置を比較的高温度に維持するために燃焼空燃比をリッチにする必要はなく、一部気筒運転時の燃料消費の悪化を改善することができる。   In addition, when switching from partial cylinder operation to full cylinder operation, the operation of the cylinder group corresponding to the other exhaust passage is started. During partial cylinder operation, exhaust gas passing through one exhaust passage Flows into the second sub-catalyst device immediately downstream of the exhaust merging section, and the temperature of the second sub-catalyst device is considerably increased when compared to the engine start time. Therefore, the catalyst is activated immediately after the start of operation. Exhaust gas can be purified. Thus, it is not necessary to make the combustion air-fuel ratio rich in order to maintain the main catalyst device at a relatively high temperature in the partial cylinder operation, and the deterioration of fuel consumption during the partial cylinder operation can be improved.

また、排気合流部の直下流側には第二副触媒装置が配置されており、第二副触媒装置の排気マニホルドまでの排気経路長は、一方の排気通路に配置された第一副触媒装置の排気マニホルドまでの排気経路長より長くされている。それにより、請求項４又は５に記載の内燃機関の排気浄化装置と同様に、第一副触媒装置と同様な短い排気経路長として他方の排気通路に第二副触媒装置を配置する場合に比較して、溶損を防止するリッチ化での燃料消費を低減することができる。   The second sub-catalyst device is disposed immediately downstream of the exhaust merging portion, and the length of the exhaust path to the exhaust manifold of the second sub-catalyst device is the first sub-catalyst device disposed in one exhaust passage. The exhaust path length to the exhaust manifold is longer. As a result, as in the exhaust gas purification device for an internal combustion engine according to claim 4 or 5, the second sub catalyst device is arranged in the other exhaust passage as a short exhaust path length similar to that of the first sub catalyst device. Thus, it is possible to reduce fuel consumption in enrichment that prevents melting damage.

図１は本発明による内燃機関の排気浄化装置の第一実施形態を示す概略図である。同図において、１ａはＶ型内燃機関の第一バンクであり、１ｂは第二バンクである。２ａは第一バンク１ａの第一吸気マニホルドであり、２ｂは第二バンク１ｂの第二吸気マニホルドである。第一吸気マニホルド２ａには第一吸気通路３ａが接続され、第一吸気マニホルド２ｂには第二吸気通路３ｂが接続される。第一吸気通路３ａ及び第二吸気通路３ｂには、それぞれスロットル弁４ａ，４ｂが配置され、第一バンク１ａ及び第二バンク１ｂの吸気量を互いに独立して制御可能となっている。   FIG. 1 is a schematic view showing a first embodiment of an exhaust gas purification apparatus for an internal combustion engine according to the present invention. In the figure, 1a is a first bank of the V-type internal combustion engine, and 1b is a second bank. 2a is a first intake manifold of the first bank 1a, and 2b is a second intake manifold of the second bank 1b. A first intake passage 3a is connected to the first intake manifold 2a, and a second intake passage 3b is connected to the first intake manifold 2b. Throttle valves 4a and 4b are arranged in the first intake passage 3a and the second intake passage 3b, respectively, and the intake air amounts of the first bank 1a and the second bank 1b can be controlled independently of each other.

５ａは第一バンク１ａの第一排気マニホルドであり、５ｂは第二バンク１ｂの第二排気マニホルドである。第一排気マニホルド５ａには第一排気通路６ａが接続され、第二排気マニホルド５ｂには第二排気通路６ｂが接続される。第一排気通路６ａ及び第二排気通路６ｂは排気合流部７において合流し、排気合流部７の下流側には主触媒装置８が配置されている。   5a is a first exhaust manifold of the first bank 1a, and 5b is a second exhaust manifold of the second bank 1b. A first exhaust passage 6a is connected to the first exhaust manifold 5a, and a second exhaust passage 6b is connected to the second exhaust manifold 5b. The first exhaust passage 6 a and the second exhaust passage 6 b merge at the exhaust merging portion 7, and the main catalyst device 8 is disposed downstream of the exhaust merging portion 7.

本Ｖ型内燃機関は、主に理論空燃比での運転を実施するものであり、主触媒装置８としては三元触媒装置が選択される。主触媒装置８は、比較的大型化されるが、車両床下に配置されるために車両搭載性の問題はない。こうして、機関高負荷時に各気筒から排出される多量の排気ガスは主触媒装置８によって良好に浄化することができる。しかしながら、機関低負荷時に各気筒から排出される排気ガスは、比較的低温度であり、これが主触媒装置８へ流入する時には、さらに温度低下するために、主触媒装置８を触媒活性化温度に維持することができなくなって、排気ガスの浄化が不十分となる。   The present V-type internal combustion engine mainly operates at a stoichiometric air-fuel ratio, and a three-way catalyst device is selected as the main catalyst device 8. Although the main catalyst device 8 is relatively large, there is no problem of vehicle mountability because it is disposed under the vehicle floor. Thus, a large amount of exhaust gas discharged from each cylinder at the time of high engine load can be purified well by the main catalyst device 8. However, the exhaust gas discharged from each cylinder when the engine is under a low load has a relatively low temperature. When the exhaust gas flows into the main catalyst device 8, the temperature further decreases, so that the main catalyst device 8 is brought to the catalyst activation temperature. It cannot be maintained, and exhaust gas purification becomes insufficient.

そのために、本実施形態では、第一排気通路４ａには三元触媒装置として第一副触媒装置９ａが配置され、第二排気通路４ｂには三元触媒装置として第二副触媒装置９ｂが配置されている。それにより、第一バンク１ａ及び第二バンク１ｂにおいて機関低負荷時の運転が実施されても、比較的低温度の排気ガスはそれほど温度低下することなく第一副触媒装置９ａ及び第二副触媒装置９ｂへ流入するために、それぞれに担持された触媒は活性化温度に維持され、この時の排気ガスを十分に浄化することができる。   Therefore, in the present embodiment, the first sub catalyst device 9a is disposed as the three-way catalyst device in the first exhaust passage 4a, and the second sub catalyst device 9b is disposed as the three-way catalyst device in the second exhaust passage 4b. Has been. Thereby, even if the first bank 1a and the second bank 1b are operated at the time of engine low load, the first sub-catalyst device 9a and the second sub-catalyst 9a and the second sub-catalyst do not decrease the temperature of the exhaust gas having relatively low temperature. In order to flow into the apparatus 9b, the catalyst carried on each is maintained at the activation temperature, and the exhaust gas at this time can be sufficiently purified.

本実施形態において、機関始動時、例えば、クランキングの開始から機関回転数がアイドル回転数に安定するまでの間、又は、クランキングの開始から燃料増量のアイドル運転が終了して機関暖機が完了するまでの間は、第一バンク１ａの気筒だけを運転し、第二バンク１ｂの気筒への燃料噴射を停止する一部気筒運転が実施される。それにより、第一副触媒装置９ａは、第一排気マニホルド５ａの直下流側に配置され、第一排気マニホルド５ａから第一副触媒装置９ａまでの排気経路長Ｌ１がかなり短くされているために、第一副触媒装置９ａへは第一バンク１ａの各気筒から排出される排気ガスが殆ど温度低下することなく流入し、第一副触媒装置９ａは早期に触媒活性化温度へ昇温される。こうして、第一副触媒装置９ａによって機関始動時の比較的多量の未燃燃料等を含む排気ガスを良好に浄化することができる。   In the present embodiment, when the engine is started, for example, from the start of cranking until the engine speed is stabilized at the idle speed, or from the start of cranking to the end of fuel increase idle operation, Until the completion, partial cylinder operation is performed in which only the cylinders of the first bank 1a are operated and fuel injection to the cylinders of the second bank 1b is stopped. As a result, the first sub catalyst device 9a is disposed immediately downstream of the first exhaust manifold 5a, and the exhaust path length L1 from the first exhaust manifold 5a to the first sub catalyst device 9a is considerably shortened. The exhaust gas discharged from each cylinder of the first bank 1a flows into the first sub catalyst device 9a with almost no temperature drop, and the first sub catalyst device 9a is heated to the catalyst activation temperature at an early stage. . Thus, the exhaust gas containing a relatively large amount of unburned fuel and the like at the time of starting the engine can be well purified by the first sub catalyst device 9a.

機関始動時の後に、一部気筒運転から第二バンク１ｂの気筒の運転を開始する全気筒運転へ切り換えられる時には、機関本体近くの第二排気通路６ｂに配置された第二副触媒装置９ｂは、この時までの機関本体からの第二排気通路６ｂを介する伝熱により、機関始動開始時に比較すれば昇温されているために、第二バンク１ｂからの排気ガスが流入すれば直ぐに触媒が活性化して排気ガスを浄化することができる。第二副触媒装置９ｂが昇温され易くするために、本実施形態においては、第二副触媒装置９ｂを第二排気マニホルド５ｂの直下流側に配置し、第二排気マニホルド５ｂから第二副触媒装置９ｂまでの排気経路長Ｌ２を第一副触媒装置９ａと同様にかなり短くしている。   When the engine is switched from the partial cylinder operation to the full cylinder operation for starting the operation of the cylinders of the second bank 1b after the engine is started, the second auxiliary catalyst device 9b disposed in the second exhaust passage 6b near the engine body is Because of the heat transfer through the second exhaust passage 6b from the engine main body up to this time, the temperature is raised compared to when the engine starts, so that the catalyst is immediately produced when the exhaust gas from the second bank 1b flows in. It can be activated to purify the exhaust gas. In order to make it easy to raise the temperature of the second sub catalyst device 9b, in the present embodiment, the second sub catalyst device 9b is arranged immediately downstream of the second exhaust manifold 5b, and the second sub catalyst device 9b is connected to the second sub manifold device 5b. The exhaust path length L2 to the catalyst device 9b is considerably shortened similarly to the first sub catalyst device 9a.

しかしながら、第二副触媒装置９ｂは、機関始動時の比較的多量に未燃燃料等を含む排気ガスを浄化する必要がないために、本実施形態においては、第二副触媒装置９ｂの触媒担持量は、第一副触媒装置９ａの触媒担持量より少なくされており、それにより、第一副触媒装置９ａと同様な高価な副触媒装置を第二排気通路６ｂにも配置する場合に比較して、排気浄化装置のコストアップを抑制している。   However, since the second sub catalyst device 9b does not need to purify exhaust gas containing unburned fuel or the like in a relatively large amount at the time of starting the engine, in the present embodiment, the catalyst support of the second sub catalyst device 9b is carried out. The amount is smaller than the amount of the catalyst supported by the first sub catalyst device 9a, thereby comparing with the case where an expensive sub catalyst device similar to the first sub catalyst device 9a is also arranged in the second exhaust passage 6b. Thus, an increase in the cost of the exhaust purification device is suppressed.

また、第二副触媒装置９ｂは機関始動時の排気ガスを浄化する必要がないために、第二副触媒装置９ｂの熱容量は、安価な材料を使用する等して、第一副触媒装置の熱容量より大きくして良く、それにより、第一副触媒装置と同様な高価な副触媒装置を第二排気通路６ｂにも配置する場合に比較して、排気浄化装置のコストアップを抑制することができる。   Further, since the second sub-catalyst device 9b does not need to purify the exhaust gas at the time of starting the engine, the heat capacity of the second sub-catalyst device 9b can be reduced by using an inexpensive material. It may be larger than the heat capacity, thereby suppressing an increase in the cost of the exhaust purification device as compared with the case where an expensive sub catalyst device similar to the first sub catalyst device is also arranged in the second exhaust passage 6b. it can.

また、第二副触媒装置９ｂは機関始動時の排気ガスを浄化する必要がないために、第二副触媒装置９ｂに担持させた触媒を、安価なものとして、第一副触媒装置に担持させた触媒より高温活性として良く、それにより、第一副触媒装置と同様な高価な副触媒装置を第二排気通路６ｂにも配置する場合に比較して、排気浄化装置のコストアップを抑制することができる。   Further, since the second sub-catalyst device 9b does not need to purify the exhaust gas when the engine is started, the catalyst carried on the second sub-catalyst device 9b is carried on the first sub-catalyst device as an inexpensive one. The catalyst can be activated at a higher temperature than the catalyst, thereby suppressing an increase in the cost of the exhaust purification device as compared with the case where an expensive sub catalyst device similar to the first sub catalyst device is also arranged in the second exhaust passage 6b. Can do.

図２は本発明による内燃機関の排気浄化装置の第二実施形態を示す概略図である。第一実施形態との違いについてのみ以下に説明する。本実施形態においては、第一排気マニホルド５ａから第一副触媒装置９ａまでの排気経路長Ｌ１は、第二排気マニホルド５ｂから第二副触媒装置９ｂ’までの排気経路長Ｌ２’より短くされ、好ましくは、第二副触媒装置９ｂ’は、排気合流部７の直上流側において第二排気通路６ｂに配置されている。   FIG. 2 is a schematic view showing a second embodiment of the exhaust gas purification apparatus for an internal combustion engine according to the present invention. Only differences from the first embodiment will be described below. In the present embodiment, the exhaust path length L1 from the first exhaust manifold 5a to the first auxiliary catalyst device 9a is shorter than the exhaust path length L2 ′ from the second exhaust manifold 5b to the second auxiliary catalyst device 9b ′. Preferably, the second sub-catalyst device 9 b ′ is disposed in the second exhaust passage 6 b on the immediately upstream side of the exhaust merging portion 7.

このような構成においても、一部気筒運転の機関始動時の排気ガスは、第一副触媒装置９ａにより良好に浄化される。また、機関始動時の後に、一部気筒運転から全気筒運転へ切り換えられる時には、機関本体近くの第二排気通路６ｂに配置された第二副触媒装置９ｂは、この時までの機関本体からの第二排気通路６ｂを介する伝熱により、機関始動開始時に比較すれば昇温されているために、第二バンク１ｂからの排気ガスが流入すれば直ぐに触媒が活性化して排気ガスを浄化することができる。さらに、第二副触媒装置９ｂ’が排気合流部７の直上流側に配置されていれば、一部気筒運転時において、第一バンク１ａからの排気ガスの一部が排気合流部７を介して第二副触媒装置９ｂ’へ逆方向に流入するために、全気筒運転に備えて、第二副触媒装置９ｂ’の温度をさらに高めることができる。   Even in such a configuration, the exhaust gas at the time of starting the engine in the partial cylinder operation is well purified by the first sub catalyst device 9a. When the engine is switched from partial cylinder operation to full cylinder operation after the engine is started, the second sub-catalyst device 9b disposed in the second exhaust passage 6b near the engine body is separated from the engine body up to this time. Due to heat transfer through the second exhaust passage 6b, the temperature is raised compared to when the engine is started. Therefore, as soon as the exhaust gas from the second bank 1b flows, the catalyst is activated to purify the exhaust gas. Can do. Further, if the second auxiliary catalyst device 9b ′ is disposed immediately upstream of the exhaust gas merging portion 7, a part of the exhaust gas from the first bank 1a is passed through the exhaust gas merging portion 7 during partial cylinder operation. Therefore, the temperature of the second sub-catalyst device 9b 'can be further increased in preparation for the full cylinder operation.

ところで、機関高負荷運転時等において気筒から排出される排気ガス温度が非常に高くなると、第一排気マニホルド５ａまでの排気経路長Ｌ１が短くされた第一副触媒装置９ａへは非常に高温度のまま排気ガスが流入して第一副触媒装置９ａを溶損させる危険があるために、第一バンク１ａの各気筒の燃焼空燃比をリッチにして気筒から排出される排気ガス温度を低下させる必要がある。本実施形態においては、第二排気通路６ｂに配置された第二副触媒装置９ｂ’の第二排気マニホルド５ｂまでの排気経路長Ｌ２’は、第一排気通路６ａに配置された第一副触媒装置９ａの第一排気マニホルド５ａまでの排気経路長Ｌ１より長くされているために、第二副触媒装置９ｂ’へは、ある程度温度低下した排気ガスしか流入せず、そのままでも溶損の危険が少ないために、第二バンク１ｂの各気筒の燃焼空燃比をリッチにする機会を減少することができる。こうして、第一副触媒装置９ａと同様な短い排気経路長Ｌ１として第二排気通路６ｂに第二副触媒装置９ｂ’を配置する場合に比較して、溶損を防止するリッチ化での燃料消費を低減することができる。   By the way, when the exhaust gas temperature exhausted from the cylinder becomes very high at the time of engine high load operation or the like, the first sub-catalyst device 9a to which the exhaust path length L1 to the first exhaust manifold 5a is shortened is very high temperature. Since there is a risk that the exhaust gas will flow in and the first sub-catalyst device 9a may be melted, the combustion air-fuel ratio of each cylinder in the first bank 1a is made rich to lower the exhaust gas temperature discharged from the cylinder. There is a need. In the present embodiment, the exhaust path length L2 ′ to the second exhaust manifold 5b of the second auxiliary catalyst device 9b ′ arranged in the second exhaust passage 6b is the first auxiliary catalyst arranged in the first exhaust passage 6a. Since the exhaust path length L1 to the first exhaust manifold 5a of the apparatus 9a is longer than the exhaust path length L1, only the exhaust gas whose temperature has decreased to some extent flows into the second auxiliary catalyst apparatus 9b ', and there is a risk of melting damage as it is. Therefore, the chance of enriching the combustion air-fuel ratio of each cylinder of the second bank 1b can be reduced. Thus, as compared with the case where the second sub-catalyst device 9b ′ is disposed in the second exhaust passage 6b with the short exhaust path length L1 similar to that of the first sub-catalyst device 9a, the fuel consumption in the enrichment that prevents the melting damage is prevented Can be reduced.

図３は本発明による内燃機関の排気浄化装置の第三実施形態を示す概略図である。第一実施形態との違いについてのみ以下に説明する。本実施形態においては、排気合流部７の直下流側に第二副触媒装置９ｂ”が配置され、第二副触媒装置９ｂ”の下流側に主触媒装置８が配置されている。   FIG. 3 is a schematic view showing a third embodiment of the exhaust gas purification apparatus for an internal combustion engine according to the present invention. Only differences from the first embodiment will be described below. In the present embodiment, the second sub catalyst device 9b ″ is disposed immediately downstream of the exhaust gas merging portion 7, and the main catalyst device 8 is disposed downstream of the second sub catalyst device 9b ″.

このような構成においても、一部気筒運転の機関始動時の排気ガスは、第一副触媒装置９ａにより良好に浄化される。また、機関始動時の後に、一部気筒運転から全気筒運転へ切り換えられる時には、一部気筒運転中において排気ガスが排気合流部７の直下流側に配置された第二副触媒装置９ｂ”を通過して第二副触媒装置９ｂ”を昇温させているために、第二バンク１ｂからの排気ガスが流入すれば直ぐに触媒が活性化して排気ガスを浄化することができる。   Even in such a configuration, the exhaust gas at the time of starting the engine in the partial cylinder operation is well purified by the first sub catalyst device 9a. Further, when the engine is switched from partial cylinder operation to full cylinder operation after the engine is started, the second sub-catalyst device 9b ″ in which exhaust gas is arranged immediately downstream of the exhaust merging portion 7 during partial cylinder operation is provided. Since the temperature of the second sub-catalyst device 9b ″ is raised and the exhaust gas from the second bank 1b flows, the catalyst is immediately activated and the exhaust gas can be purified.

また、第二実施形態において説明したように、機関高負荷時において排気ガスの温度が非常に高温度となる時には、第一副触媒装置９ａの溶損を防止するために、第一バンク１ａの各気筒の燃焼空燃比をリッチにして排気ガス温度を低下することが必要であるが、排気合流部７の直下流側に配置された第二副触媒装置９ｂ”に関しては、第二排気通路６ｂを通過して温度低下した排気ガスしか流入せず、機関高負荷時において排気ガスの温度が非常に高温度となっても溶損の危険が少ないために、第二バンク１ｂの各気筒の燃焼空燃比をリッチにする機会を減少することができる。こうして、第一副触媒装置９ａと同様な短い排気経路長Ｌ１として第二排気通路６ｂに第二副触媒装置９ｂ”を配置する場合に比較して、溶損を防止するリッチ化での燃料消費を低減することができる。   Further, as described in the second embodiment, when the temperature of the exhaust gas becomes very high at the time of high engine load, in order to prevent the first sub catalyst device 9a from being melted, Although it is necessary to reduce the exhaust gas temperature by making the combustion air-fuel ratio of each cylinder rich, with respect to the second sub-catalyst device 9b ″ disposed immediately downstream of the exhaust gas merging portion 7, the second exhaust passage 6b Since only the exhaust gas whose temperature has decreased through the exhaust gas flows in, and the exhaust gas temperature becomes very high at the time of high engine load, the risk of melting damage is small. The opportunity to enrich the air-fuel ratio can be reduced. Thus, compared with the case where the second sub-catalyst device 9b ″ is arranged in the second exhaust passage 6b with the short exhaust path length L1 similar to that of the first sub-catalyst device 9a. Rich to prevent melting damage It is possible to reduce fuel consumption in.

前述した第二及び第三実施形態において、第二副触媒装置９ｂ’，９ｂ”は、第一副触媒装置９ａと同様な触媒担持量を有し、また、同様な熱容量を有し、また、同様な低温で活性する触媒を担持しても良いが、第一副触媒装置９ａより触媒担持量を少なくし、また、熱容量を高くし、また、より高温で活性する触媒を担持するようにしても良い。   In the second and third embodiments described above, the second sub-catalyst devices 9b ′ and 9b ″ have the same catalyst loading as the first sub-catalyst device 9a, have the same heat capacity, A catalyst active at a low temperature may be supported, but the amount of catalyst supported is smaller than that of the first sub-catalyst device 9a, the heat capacity is increased, and a catalyst active at a higher temperature is supported. Also good.

前述した実施形態において、主触媒装置８は三元触媒装置としたが、内燃機関がリーンバーン運転を実施するものである場合には、ＮＯX触媒装置としても良い。また、内燃機関は、機関始動時に一部気筒運転を実施するものとしたが、もちろん、機関始動時以外の例えば低負荷時にも一部気筒運転を実施しても良い。この機関始動以外の一部気筒運転は、第二バンク１ｂを運転気筒群としても良い。 In the embodiment described above, the main catalyst device 8 is a three-way catalyst device. However, when the internal combustion engine performs a lean burn operation, it may be a NO x catalyst device. In addition, the internal combustion engine performs the partial cylinder operation at the time of starting the engine, but, of course, the partial cylinder operation may be performed even at a low load other than at the time of starting the engine. For the partial cylinder operation other than the engine start, the second bank 1b may be used as the operating cylinder group.

内燃機関はＶ型としたが、これは本発明を限定するものではなく、複数気筒が直列配置されるものでも、二つの気筒群に分けられてそれぞれに排気マニホルドが設けられる内燃機関であれば、本発明を適用可能である。また、複数の気筒群が三つ以上に分けられる場合においても、排気合流部の上流側の三つ以上の排気通路を大きく二つに分けて考えて本発明を適用すれば良い。   Although the internal combustion engine is a V type, this is not a limitation of the present invention, and even if a plurality of cylinders are arranged in series, the internal combustion engine can be divided into two cylinder groups and each provided with an exhaust manifold. The present invention can be applied. Further, even when the plurality of cylinder groups are divided into three or more, the present invention may be applied by considering the three or more exhaust passages on the upstream side of the exhaust merging portion roughly in two.

本発明による内燃機関の排気浄化装置の第一実施形態を示す概略図である。1 is a schematic view showing a first embodiment of an exhaust gas purification apparatus for an internal combustion engine according to the present invention. 本発明による内燃機関の排気浄化装置の第二実施形態を示す概略図である。It is the schematic which shows 2nd embodiment of the exhaust gas purification apparatus of the internal combustion engine by this invention. 本発明による内燃機関の排気浄化装置の第三実施形態を示す概略図である。It is the schematic which shows 3rd embodiment of the exhaust gas purification apparatus of the internal combustion engine by this invention.

符号の説明Explanation of symbols

１ａ 第一バンク
１ｂ 第二バンク
５ａ 第一排気マニホルド
５ｂ 第二排気マニホルド
６ａ 第一排気通路
６ｂ 第二排気通路
７ 排気合流部
８ 主触媒装置
９ａ 第一副触媒装置
９ｂ、９ｂ’、９ｂ” 第二副触媒装置 DESCRIPTION OF SYMBOLS 1a 1st bank 1b 2nd bank 5a 1st exhaust manifold 5b 2nd exhaust manifold 6a 1st exhaust passage 6b 2nd exhaust passage 7 Exhaust merge part 8 Main catalyst apparatus 9a 1st subcatalyst apparatus 9b, 9b ', 9b "1st Two secondary catalyst equipment

Claims (6)

多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、二つの前記排気通路の他方には第二副触媒装置が配置され、前記第二副触媒装置の触媒担持量は、前記第一副触媒装置の触媒担持量より少なくされ、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする内燃機関の排気浄化装置。   All cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to the exhaust merging portion, and a main catalyst device is disposed downstream of the exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine, the first sub catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and the second sub catalyst device is disposed in the other of the two exhaust passages. The amount of catalyst supported by the second sub-catalyst device is made smaller than the amount of catalyst supported by the first sub-catalyst device, and when the engine is started, only the cylinder group corresponding to the one exhaust passage is operated. An exhaust gas purification apparatus for an internal combustion engine characterized by the above. 多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、二つの前記排気通路の他方には第二副触媒装置が配置され、前記第一副触媒装置の熱容量は、前記第二副触媒装置の熱容量より小さくされ、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする内燃機関の排気浄化装置。   All cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to the exhaust merging portion, and a main catalyst device is disposed downstream of the exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine, the first sub catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and the second sub catalyst device is disposed in the other of the two exhaust passages. The internal combustion engine is characterized in that the heat capacity of the first sub catalyst device is smaller than the heat capacity of the second sub catalyst device, and only the cylinder group corresponding to the one exhaust passage is operated when the engine is started. Engine exhaust purification system. 多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、二つの前記排気通路の他方には第二副触媒装置が配置され、前記第一副触媒装置の触媒は、前記第二副触媒装置の触媒より低温活性とされ、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする内燃機関の排気浄化装置。   All cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to the exhaust merging portion, and a main catalyst device is disposed downstream of the exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine, the first sub catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and the second sub catalyst device is disposed in the other of the two exhaust passages. The catalyst of the first sub catalyst device is activated at a lower temperature than the catalyst of the second sub catalyst device, and only the cylinder group corresponding to the one exhaust passage is operated when the engine is started. An exhaust purification device for an internal combustion engine. 多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、二つの前記排気通路の他方には第二副触媒装置が配置され、対応する排気マニホルドから前記第一副触媒装置までの排気経路長は、対応する排気マニホルドから前記第二副触媒装置までの排気経路長より短くされ、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする内燃機関の排気浄化装置。   All cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to the exhaust merging portion, and a main catalyst device is disposed downstream of the exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine, the first sub catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and the second sub catalyst device is disposed in the other of the two exhaust passages. The exhaust path length from the corresponding exhaust manifold to the first sub catalyst device is shorter than the exhaust path length from the corresponding exhaust manifold to the second sub catalyst device, and when the engine is started, the one exhaust gas is An exhaust emission control device for an internal combustion engine, wherein only the cylinder group corresponding to the passage is operated. 前記第二副触媒装置は、前記排気合流部の直上流側において前記他方の排気通路に配置されていることを特徴とする請求項４に記載の内燃機関の排気浄化装置。   5. The exhaust gas purification apparatus for an internal combustion engine according to claim 4, wherein the second auxiliary catalyst device is disposed in the other exhaust passage immediately upstream of the exhaust gas merging portion. 多気筒内燃機関の全気筒を二つの気筒群に分けて、それぞれの排気マニホルドから排気合流部までは気筒郡毎に排気通路が設けられ、前記排気合流部の下流側には主触媒装置が配置された内燃機関の排気浄化装置において、前記排気合流部の上流側の二つの前記排気通路の一方には第一副触媒装置が配置され、前記排気合流部の直下流側には第二副触媒装置が配置され、機関始動時には、前記一方の排気通路に対応する気筒群だけを運転することを特徴とする内燃機関の排気浄化装置。   All cylinders of a multi-cylinder internal combustion engine are divided into two cylinder groups, and an exhaust passage is provided for each cylinder group from each exhaust manifold to the exhaust merging portion, and a main catalyst device is disposed downstream of the exhaust merging portion. In the exhaust gas purification apparatus for an internal combustion engine, a first sub catalyst device is disposed in one of the two exhaust passages upstream of the exhaust merging portion, and a second sub catalyst is disposed immediately downstream of the exhaust merging portion. An exhaust purification device for an internal combustion engine, wherein the device is disposed and only the cylinder group corresponding to the one exhaust passage is operated when the engine is started.
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