JP2015048838A - Exhaust system for internal combustion engine - Google Patents
Exhaust system for internal combustion engine Download PDFInfo
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- 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
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
Description
本発明は、内燃機関の排気装置に関する。 The present invention relates to an exhaust device for an internal combustion engine.
特許文献１に記載された内燃機関の排気装置は、水冷式過給機および連通排気管を有している。特許文献１は、触媒装置を明示していないが、水冷式過給機の下流側に触媒装置を有していると考えられる。 The exhaust device for an internal combustion engine described in Patent Document 1 includes a water-cooled supercharger and a communication exhaust pipe. Patent Document 1 does not clearly indicate a catalyst device, but is considered to have a catalyst device downstream of the water-cooled supercharger.
水冷式過給機は、過給機内上流通路、過給機内下流通路、バイパス通路、および、冷却通路を有している。過給機内下流通路は、過給機内上流通路と連通し、タービンホイールから吐出された排気を連通排気管に流す。バイパス通路は、過給機内上流通路から分岐している。冷却通路は、バイパス通路の周囲を通過している。連通排気管は、過給機内下流通路およびバイパス通路と触媒装置とを互いに接続している。バイパス通路を流れる排気は、冷却通路を流れる冷却水により冷却される。 The water-cooled supercharger has a supercharger upstream passage, a supercharger downstream passage, a bypass passage, and a cooling passage. The supercharger internal downstream passage communicates with the supercharger internal upstream passage, and allows exhaust discharged from the turbine wheel to flow into the communication exhaust pipe. The bypass passage branches off from the upstream passage in the supercharger. The cooling passage passes around the bypass passage. The communication exhaust pipe connects the turbocharger downstream passage and bypass passage and the catalyst device to each other. Exhaust gas flowing through the bypass passage is cooled by cooling water flowing through the cooling passage.
バイパス通路から連通排気管に流れ込んだ排気、および、過給機内下流通路から連通排気管に流れ込んだ排気は、連通排気管において混合する。連通排気管において混合した排気は、触媒装置に流れ込む。連通排気管を流れる排気の温度は、バイパス通路を通過した排気、および、過給機内下流通路を通過した排気が混合することにより、過給機内下流通路を流れる排気の温度よりも低くなる。このため、機関本体から流れ出た排気の温度が低いとき、触媒装置の温度が上昇しにくい。このため、特許文献１の排気装置は、触媒装置の触媒の活性化を促進する側面において、改善の余地が存在している。 The exhaust gas flowing into the communication exhaust pipe from the bypass passage and the exhaust gas flowing into the communication exhaust pipe from the downstream passage in the supercharger are mixed in the communication exhaust pipe. The exhaust gas mixed in the communication exhaust pipe flows into the catalyst device. The temperature of the exhaust gas flowing through the communication exhaust pipe becomes lower than the temperature of the exhaust gas flowing through the supercharger downstream passage by mixing the exhaust gas passing through the bypass passage and the exhaust gas passing through the supercharger downstream passage. For this reason, when the temperature of the exhaust gas flowing out from the engine body is low, the temperature of the catalyst device hardly rises. For this reason, the exhaust device of Patent Document 1 has room for improvement in terms of promoting activation of the catalyst of the catalyst device.
本発明は、触媒の活性化が促進されやすくなる内燃機関の排気装置を提供することを目的としている。 An object of the present invention is to provide an exhaust system for an internal combustion engine that facilitates activation of a catalyst.
本内燃機関の排気装置の独立した一形態は、次の事項を有している。前記排気装置は、水冷式過給機、連通排気管、および、ヒートインシュレータを有し、前記水冷式過給機は、過給機内上流通路、過給機内下流通路、バイパス通路、および、過給機内冷却通路を有し、前記過給機内上流通路は、機関本体から流れ出た排気をタービンホイールに流し、前記過給機内下流通路は、前記過給機内上流通路と連通し、前記タービンホイールから吐出された排気を前記連通排気管に流し、前記バイパス通路は、前記過給機内上流通路から分岐し、前記過給機内冷却通路は、前記過給機内下流通路の周囲を通過し、前記連通排気管の内部の通路である連通排気通路は、前記過給機内下流通路および前記バイパス通路と触媒装置の内部の通路である触媒排気通路とを互いに連通し、前記ヒートインシュレータは、前記連通排気通路に配置され、前記連通排気通路の入口から出口までにわたり前記連通排気通路を第１区画通路および第２区画通路に区画し、前記第１区画通路は、前記過給機内下流通路と前記触媒排気通路とを互いに連通し、前記第２区画通路は、前記バイパス通路と前記触媒排気通路とを互いに連通している。 An independent form of the exhaust system of the internal combustion engine has the following matters. The exhaust device includes a water-cooled supercharger, a communication exhaust pipe, and a heat insulator. The water-cooled supercharger includes a supercharger upstream passage, a supercharger downstream passage, a bypass passage, and a supercharger. A turbocharger internal cooling passage, the supercharger internal upstream passage flows exhaust gas flowing out of the engine body to a turbine wheel, the supercharger internal downstream passage communicates with the supercharger internal upstream passage, and the turbine Exhaust gas discharged from the wheel is caused to flow through the communication exhaust pipe, the bypass passage branches from the upstream passage in the supercharger, the cooling passage in the supercharger passes around the downstream passage in the supercharger, The communication exhaust passage, which is a passage inside the communication exhaust pipe, communicates the downstream passage in the supercharger and the bypass passage with the catalyst exhaust passage, which is a passage inside the catalyst device, and the heat insulator is connected to the communication exhaust pipe. The communication exhaust passage is disposed in an air passage, and divides the communication exhaust passage into a first compartment passage and a second compartment passage from an inlet to an outlet of the communication exhaust passage, and the first compartment passage includes the downstream in the supercharger and the catalyst The exhaust passage communicates with each other, and the second partition passage communicates the bypass passage and the catalyst exhaust passage with each other.
過給機内冷却通路が過給機内下流通路の周囲を通過している。このため、過給機内下流通路を流れる排気の温度が低下しやすい。このため、過給機内下流通路から第１区画通路に流れ込む排気の温度は、バイパス通路から第２区画通路に流れ込む排気の温度よりも低い。第１区画通路および第２区画通路がヒートインシュレータにより区画されているため、第２区画通路を流れる排気の熱が第１区画通路を流れる排気に移動しにくい。このため、バイパス通路から第２区画通路に流れ込んだ排気は、温度を保ちながら触媒排気通路に流れ込む。このため、機関本体から流れ出た排気の温度が低い場合でも、触媒の活性化が促進されやすくなる。 The supercharger cooling passage passes around the supercharger downstream passage. For this reason, the temperature of the exhaust gas flowing through the supercharger downstream passage tends to decrease. For this reason, the temperature of the exhaust gas flowing into the first compartment passage from the downstream passage in the supercharger is lower than the temperature of the exhaust gas flowing into the second compartment passage from the bypass passage. Since the first partition passage and the second partition passage are partitioned by the heat insulator, the heat of the exhaust gas flowing through the second partition passage is difficult to move to the exhaust gas flowing through the first partition passage. For this reason, the exhaust gas flowing into the second partition passage from the bypass passage flows into the catalyst exhaust passage while maintaining the temperature. For this reason, even when the temperature of the exhaust gas flowing out from the engine body is low, the activation of the catalyst is easily promoted.
図１を参照して、内燃機関の排気装置１の構成について説明する。
排気装置１は、機関本体（図示略）から流れ出た排気により過給する機能、および、機関本体から流れ出た排気を浄化する機能を有している。排気装置１は、水冷式過給機１０、触媒装置３０、連通排気管４０、および、ヒートインシュレータ６０を有している。なお、図１に記載された連通排気管４０およびヒートインシュレータ６０は、断面構造を示している。
With reference to FIG. 1, the structure of the exhaust apparatus 1 of an internal combustion engine is demonstrated.
The exhaust device 1 has a function of supercharging with exhaust gas flowing out from an engine body (not shown) and a function of purifying exhaust gas flowing out of the engine body. The exhaust device 1 includes a water-cooled supercharger 10, a catalyst device 30, a communication exhaust pipe 40, and a heat insulator 60. The communication exhaust pipe 40 and the heat insulator 60 shown in FIG. 1 have a cross-sectional structure.
触媒装置３０は、触媒排気管３１、触媒排気通路３２、および、触媒３３を有している。触媒排気通路３２は、触媒排気管３１の内部に形成されている排気通路である。触媒３３は、触媒排気通路３２に配置されている。 The catalyst device 30 includes a catalyst exhaust pipe 31, a catalyst exhaust passage 32, and a catalyst 33. The catalyst exhaust passage 32 is an exhaust passage formed inside the catalyst exhaust pipe 31. The catalyst 33 is disposed in the catalyst exhaust passage 32.
水冷式過給機１０は、タービンハウジング２０、タービンホイール（図示略）、ウェイストゲートバルブ（図示略）、過給機内上流通路（図示略）、過給機内下流通路２１、バイパス通路２２、および、過給機内冷却通路（図示略）を有している。 The water-cooled supercharger 10 includes a turbine housing 20, a turbine wheel (not shown), a waste gate valve (not shown), a supercharger upstream passage (not shown), a supercharger downstream passage 21, a bypass passage 22, and And a supercharger cooling passage (not shown).
タービンハウジング２０は、本体部２０Ａ、出口部２０Ｂ、および、区画部２０Ｃを有している。本体部２０Ａ、出口部２０Ｂ、および、区画部２０Ｃは、一体化している。出口部２０Ｂは、本体部２０Ａのスクロール部と連続している。区画部２０Ｃは、出口部２０Ｂの内部に形成されている。区画部２０Ｃは、出口部２０Ｂの内部の空間を、過給機内下流通路２１およびバイパス通路２２の出口部分に区画している。 The turbine housing 20 has a main body 20A, an outlet 20B, and a partition 20C. The main body 20A, the outlet 20B, and the partition 20C are integrated. The outlet portion 20B is continuous with the scroll portion of the main body portion 20A. The partition part 20C is formed inside the outlet part 20B. The partition portion 20C partitions the space inside the outlet portion 20B into outlet portions of the supercharger downstream passage 21 and the bypass passage 22.
過給機内上流通路は、本体部２０Ａの内部に形成された排気通路である。過給機内上流通路は、スクロール通路（図示略）を含む。過給機内下流通路２１は、過給機内上流通路と連通している。過給機内下流通路２１は、タービンホイールから吐出された排気を連通排気管４０に流す。 The upstream passage in the supercharger is an exhaust passage formed inside the main body 20A. The supercharger upstream passage includes a scroll passage (not shown). The supercharger downstream passage 21 communicates with the supercharger upstream passage. The supercharger internal downstream passage 21 allows the exhaust discharged from the turbine wheel to flow into the communication exhaust pipe 40.
バイパス通路２２は、過給機内上流通路を流れる排気の少なくとも一部を、タービンホイールをバイパスさせて連通排気管４０に流す。バイパス通路２２を流れる排気の流量は、ウェイストゲートバルブにより変更される。 The bypass passage 22 causes at least a part of the exhaust flowing in the upstream passage in the supercharger to flow through the communication exhaust pipe 40 by bypassing the turbine wheel. The flow rate of the exhaust gas flowing through the bypass passage 22 is changed by a waste gate valve.
過給機内冷却通路は、タービンハウジング２０の内部において、過給機内上流通路および過給機内下流通路２１の周囲に形成されている。過給機内冷却通路は、機関本体の冷却通路と接続されている。冷却水は、機関本体の冷却通路および過給機内冷却通路を循環する。過給機内冷却通路を流れる冷却水は、タービンハウジング２０を冷却する。 The supercharger cooling passage is formed around the turbocharger upstream passage and the supercharger downstream passage 21 inside the turbine housing 20. The supercharger cooling passage is connected to the cooling passage of the engine body. The cooling water circulates through the cooling passage of the engine body and the cooling passage in the supercharger. The cooling water flowing through the supercharger cooling passage cools the turbine housing 20.
連通排気管４０は、タービンハウジング２０の出口部２０Ｂと触媒排気管３１とを互いに接続している。連通排気管４０の内部の排気通路である連通排気通路５０は、過給機内下流通路２１およびバイパス通路２２と触媒排気通路３２とを互いに連通している。 The communication exhaust pipe 40 connects the outlet 20B of the turbine housing 20 and the catalyst exhaust pipe 31 to each other. A communication exhaust passage 50, which is an exhaust passage inside the communication exhaust pipe 40, communicates the turbocharger downstream passage 21, the bypass passage 22 and the catalyst exhaust passage 32 with each other.
ヒートインシュレータ６０は、管形状を有している。ヒートインシュレータ６０は、連通排気通路５０に配置されている。ヒートインシュレータ６０の上流端部６０Ａは、バイパス通路２２の出口部分に嵌め込まれている。ヒートインシュレータ６０の下流端部６０Ｂは、触媒排気通路３２の入口直前の部分に存在している。ヒートインシュレータ６０は、連通排気通路５０の入口から出口までにわたり連通排気通路５０を第１区画通路５１および第２区画通路５２に区画している。第１区画通路５１は、過給機内下流通路２１と触媒排気通路３２とを互いに接続している。第２区画通路５２は、バイパス通路２２の出口部分と触媒排気通路３２とを互いに接続している。 The heat insulator 60 has a tube shape. The heat insulator 60 is disposed in the communication exhaust passage 50. The upstream end 60 </ b> A of the heat insulator 60 is fitted into the outlet portion of the bypass passage 22. The downstream end portion 60 </ b> B of the heat insulator 60 exists at a portion immediately before the entrance of the catalyst exhaust passage 32. The heat insulator 60 divides the communication exhaust passage 50 into a first compartment passage 51 and a second compartment passage 52 from the inlet to the outlet of the communication exhaust passage 50. The first partition passage 51 connects the turbocharger downstream passage 21 and the catalyst exhaust passage 32 to each other. The second partition passage 52 connects the outlet portion of the bypass passage 22 and the catalyst exhaust passage 32 to each other.
排気装置１の作用について説明する。
過給機内冷却通路が過給機内下流通路２１の周囲を通過している。このため、過給機内下流通路２１を流れる排気の温度が低下しやすい。このため、過給機内下流通路２１から第１区画通路５１に流れ込む排気の温度は、バイパス通路２２の出口部分から第２区画通路５２に流れ込む排気の温度よりも低い。
The operation of the exhaust device 1 will be described.
The supercharger cooling passage passes around the supercharger downstream passage 21. For this reason, the temperature of the exhaust gas flowing through the supercharger downstream passage 21 tends to decrease. For this reason, the temperature of the exhaust gas flowing into the first compartment passage 51 from the supercharger downstream passage 21 is lower than the temperature of the exhaust gas flowing into the second compartment passage 52 from the outlet portion of the bypass passage 22.
第１区画通路５１および第２区画通路５２がヒートインシュレータ６０により区画されているため、第２区画通路５２を流れる排気の熱が、第１区画通路５１を流れる排気に移動しにくい。このため、バイパス通路２２の出口部分から第２区画通路５２に流れ込んだ排気は、温度を保ちながら触媒排気通路３２に流れ込む。このため、機関本体から流れ出た排気の温度が低い場合でも、触媒３３の活性化が促進されやすくなる。 Since the first partition passage 51 and the second partition passage 52 are partitioned by the heat insulator 60, it is difficult for the heat of the exhaust gas flowing through the second partition passage 52 to move to the exhaust gas flowing through the first partition passage 51. For this reason, the exhaust gas flowing into the second partition passage 52 from the outlet portion of the bypass passage 22 flows into the catalyst exhaust passage 32 while maintaining the temperature. For this reason, even when the temperature of the exhaust gas flowing out from the engine body is low, the activation of the catalyst 33 is easily promoted.
ヒートインシュレータ６０の上流端部６０Ａがバイパス通路２２の出口部分に嵌め込まれているため、バイパス通路２２の出口部分を流れる排気の温度が低下しにくい。このため、触媒排気通路３２に流れ込む排気の温度がより高くなる。 Since the upstream end portion 60 </ b> A of the heat insulator 60 is fitted into the outlet portion of the bypass passage 22, the temperature of the exhaust gas flowing through the outlet portion of the bypass passage 22 is unlikely to decrease. For this reason, the temperature of the exhaust gas flowing into the catalyst exhaust passage 32 becomes higher.
本排気装置は、以下の変形例を取り得る。
（ａ）排気装置１が、管形状とは異なる形状のヒートインシュレータを有する。
（ｂ）断熱被膜が、ヒートインシュレータ６０の内周面に形成される。この変形例によれば、第２区画通路５２を流れる排気の断熱効果がより高くなる。
The exhaust system can take the following modifications.
(A) The exhaust device 1 has a heat insulator having a shape different from the tube shape.
(B) A heat insulating coating is formed on the inner peripheral surface of the heat insulator 60. According to this modification, the heat insulation effect of the exhaust gas flowing through the second partition passage 52 is further increased.
（ｃ）ヒートインシュレータ６０が、エアギャップを有する。この変形例によれば、第２区画通路５２を流れる排気の断熱効果がより高くなる。 (C) The heat insulator 60 has an air gap. According to this modification, the heat insulation effect of the exhaust gas flowing through the second partition passage 52 is further increased.
１…排気装置、１０…水冷式過給機、２１…過給機内下流通路、２２…バイパス通路、３０…触媒装置、３２…触媒排気通路、４０…連通排気管、５０…連通排気通路、５１…第１区画通路、５２…第２区画通路、６０…ヒートインシュレータ。 DESCRIPTION OF SYMBOLS 1 ... Exhaust device, 10 ... Water-cooled supercharger, 21 ... Downstream passage in supercharger, 22 ... Bypass passage, 30 ... Catalyst device, 32 ... Catalyst exhaust passage, 40 ... Communication exhaust pipe, 50 ... Communication exhaust passage, 51 ... 1st division path, 52 ... 2nd division path, 60 ... Heat insulator.
Claims (1)
前記排気装置は、水冷式過給機、連通排気管、および、ヒートインシュレータを有し、
前記水冷式過給機は、過給機内上流通路、過給機内下流通路、バイパス通路、および、過給機内冷却通路を有し、
前記過給機内上流通路は、機関本体から流れ出た排気をタービンホイールに流し、
前記過給機内下流通路は、前記過給機内上流通路と連通し、前記タービンホイールから吐出された排気を前記連通排気管に流し、
前記バイパス通路は、前記過給機内上流通路から分岐し、
前記過給機内冷却通路は、前記過給機内下流通路の周囲を通過し、
前記連通排気管の内部の通路である連通排気通路は、前記過給機内下流通路および前記バイパス通路と触媒装置の内部の通路である触媒排気通路とを互いに連通し、
前記ヒートインシュレータは、前記連通排気通路に配置され、前記連通排気通路の入口から出口までにわたり前記連通排気通路を第１区画通路および第２区画通路に区画し、
前記第１区画通路は、前記過給機内下流通路と前記触媒排気通路とを互いに連通し、
前記第２区画通路は、前記バイパス通路と前記触媒排気通路とを互いに連通している
内燃機関の排気装置。 An exhaust system for an internal combustion engine,
The exhaust device has a water-cooled supercharger, a communication exhaust pipe, and a heat insulator,
The water-cooled supercharger has a supercharger upstream passage, a supercharger downstream passage, a bypass passage, and a supercharger cooling passage,
The upstream passage in the supercharger flows exhaust gas flowing out from the engine body to the turbine wheel,
The downstream in the supercharger communicates with the upstream passage in the supercharger, and the exhaust discharged from the turbine wheel flows through the communication exhaust pipe,
The bypass passage branches from the upstream passage in the supercharger,
The cooling passage in the supercharger passes around the downstream passage in the supercharger;
The communication exhaust passage, which is a passage inside the communication exhaust pipe, communicates the downstream passage in the supercharger and the bypass passage with the catalyst exhaust passage, which is a passage inside the catalyst device,
The heat insulator is arranged in the communication exhaust passage, and divides the communication exhaust passage into a first compartment passage and a second compartment passage from an inlet to an outlet of the communication exhaust passage,
The first partition passage communicates the turbocharger downstream passage and the catalyst exhaust passage with each other,
The exhaust system for an internal combustion engine, wherein the second partition passage communicates the bypass passage and the catalyst exhaust passage.
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| JP2013183371A JP6136783B2 (en) | 2013-09-04 | 2013-09-04 | Exhaust device for internal combustion engine |
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| JP2013183371A JP6136783B2 (en) | 2013-09-04 | 2013-09-04 | Exhaust device for internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642410A (en) * | 2016-07-21 | 2018-01-30 | 福特环球技术公司 | Explosive motor with exhaust turbo-charger |
| JP2018087555A (en) * | 2016-11-30 | 2018-06-07 | ダイハツ工業株式会社 | Internal combustion engine |
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| JPS5431222Y2 (en) * | 1976-04-13 | 1979-09-29 | ||
| JP2002364503A (en) * | 2001-06-01 | 2002-12-18 | Hitachi Ltd | Controller of internal combustion engine having turbocharger in exhaust system |
| JP2008019711A (en) * | 2006-07-10 | 2008-01-31 | Toyota Motor Corp | Supercharger system of internal combustion engine |
| JP2008267257A (en) * | 2007-04-19 | 2008-11-06 | Toyota Motor Corp | Supercharger |
| JP2012225297A (en) * | 2011-04-21 | 2012-11-15 | Toyota Motor Corp | Engine exhaust device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5431222Y2 (en) * | 1976-04-13 | 1979-09-29 | ||
| JP2002364503A (en) * | 2001-06-01 | 2002-12-18 | Hitachi Ltd | Controller of internal combustion engine having turbocharger in exhaust system |
| JP2008019711A (en) * | 2006-07-10 | 2008-01-31 | Toyota Motor Corp | Supercharger system of internal combustion engine |
| JP2008267257A (en) * | 2007-04-19 | 2008-11-06 | Toyota Motor Corp | Supercharger |
| JP2012225297A (en) * | 2011-04-21 | 2012-11-15 | Toyota Motor Corp | Engine exhaust device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107642410A (en) * | 2016-07-21 | 2018-01-30 | 福特环球技术公司 | Explosive motor with exhaust turbo-charger |
| CN107642410B (en) * | 2016-07-21 | 2021-09-21 | 福特环球技术公司 | Internal combustion engine with exhaust-gas turbocharging device |
| JP2018087555A (en) * | 2016-11-30 | 2018-06-07 | ダイハツ工業株式会社 | Internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6136783B2 (en) | 2017-05-31 |
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