WO2012127621A1 - Moteur à combustion interne et dispositif de conversion des gaz d'échappement - Google Patents

Moteur à combustion interne et dispositif de conversion des gaz d'échappement Download PDF

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Publication number
WO2012127621A1
WO2012127621A1 PCT/JP2011/056811 JP2011056811W WO2012127621A1 WO 2012127621 A1 WO2012127621 A1 WO 2012127621A1 JP 2011056811 W JP2011056811 W JP 2011056811W WO 2012127621 A1 WO2012127621 A1 WO 2012127621A1
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WO
WIPO (PCT)
Prior art keywords
exhaust
pipe
exhaust pipe
dispersion plate
disposed
Prior art date
Application number
PCT/JP2011/056811
Other languages
English (en)
Japanese (ja)
Inventor
未来 田中
Original Assignee
トヨタ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Priority to PCT/JP2011/056811 priority Critical patent/WO2012127621A1/fr
Publication of WO2012127621A1 publication Critical patent/WO2012127621A1/fr

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Classifications

    • 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
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • 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]
    • 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

Definitions

  • the present invention relates to an exhaust purification device for an internal combustion engine.
  • Exhaust gas of an internal combustion engine comprising a reduction catalyst as an exhaust purification catalyst disposed in an exhaust passage of the internal combustion engine, and a reducing agent injection unit as an addition unit for injecting a reducing agent into the exhaust passage upstream of the reduction catalyst
  • a purification device is known (see, for example, Patent Document 1).
  • a mixer plate as a dispersion plate for mixing and diffusing the reducing agent and the exhaust is arranged in the exhaust passage upstream of the reduction catalyst and downstream of the injection position by the reducing agent injection unit. Yes.
  • the mixer plate is disposed in a connecting portion in which an upstream exhaust pipe and a downstream exhaust pipe are connected by a flange portion.
  • the mixer plate is sandwiched between the flange portions of the exhaust pipe.
  • the mixer plate exposed to the outside of the exhaust pipe is easily cooled by the influence of the outside of the exhaust pipe being transmitted to the mixer plate.
  • the flange portion of the exhaust pipe has a large heat capacity and high heat dissipation, the mixer plate sandwiched between the flange portions is easily cooled by the heat absorbed by the flange portions. Due to these factors, the temperature of the mixer plate is lowered, so that the reducing agent added to the exhaust gas easily adheres to the mixer plate and forms droplets. Moreover, there is a possibility that the reduced reducing agent may leak from the joint surface of the flange portion that sandwiches the mixer plate.
  • the present invention has been made in view of the above circumstances, and suppresses the additive from adhering to the dispersion plate and forming droplets, and also prevents the additive from dropping from leaking from the connection portion of the exhaust pipe. It aims at providing the technology which controls.
  • the present invention An exhaust purification catalyst that is disposed in the exhaust passage of the internal combustion engine and purifies the exhaust; An addition unit that is disposed in the exhaust passage upstream of the exhaust purification catalyst and adds an additive supplied to the exhaust purification catalyst to the exhaust; A dispersion plate that is disposed in the exhaust passage between the addition part and the exhaust purification catalyst, and mixes and diffuses the additive and exhaust added from the addition part;
  • a part of the exhaust passage is defined as an inner pipe at a downstream end of the first exhaust pipe in which the dispersion plate is disposed, and an upstream end of a second exhaust pipe in which the exhaust purification catalyst is disposed as an outer pipe.
  • the first exhaust pipe and the second exhaust pipe are joined by joining a first flange part projecting to the outer periphery of the middle part of the first exhaust pipe and a second flange part projecting to the outer periphery of the upstream end of the second exhaust pipe.
  • An exhaust purification device for an internal combustion engine that connects an exhaust pipe.
  • the dispersion plate can be arranged in the exhaust passage of the double pipe structure. Thereby, it is possible to suppress the influence of the outside of the exhaust passage from being transmitted to the dispersion plate and cooling the dispersion plate. Further, the dispersion plate and the first and second flange portions can be arranged apart from each other. Thereby, it can suppress that the heat
  • the first and second flange portions can be arranged on the upstream side of the exhaust passage of the double pipe structure.
  • the dropletized additive is likely to fly off the exhaust passage along the flow of the exhaust gas. Therefore, the dropletized additive reaches the first and second flange portions by going back between the first exhaust pipe which is the inner pipe and the second exhaust pipe which is the outer pipe in the exhaust passage of the double pipe structure. It is hard to do. Therefore, it can suppress that the additive agent made into droplet leaks from the connection part of the 1st, 2nd exhaust pipe joined by the 1st, 2nd flange part.
  • the dispersion plate may be disposed at a downstream end of the first exhaust pipe.
  • the addition part and the dispersion plate can be arranged further apart.
  • the additive added in the addition part is mixed with the exhaust gas for a longer time before reaching the dispersion plate, and atomization is promoted. For this reason, it is possible to suppress the additive reaching the dispersion plate from adhering to the dispersion plate and forming droplets.
  • the addition portion may be disposed in the first exhaust pipe.
  • the addition unit and the dispersion plate can be arranged in the first exhaust pipe to form a unit.
  • distribution board can be preset so that atomization of an additive may be accelerated
  • handling can be facilitated by unitization.
  • the present invention it is possible to suppress the additive from adhering to the dispersion plate and forming droplets, and to prevent the additive additive from leaking from the connecting portion of the exhaust pipe.
  • FIG. 1 is a diagram illustrating a schematic configuration of an internal combustion engine according to Embodiment 1 of the present invention.
  • FIG. 1 is a diagram illustrating a schematic configuration of an internal combustion engine 1 to which an exhaust gas purification apparatus for an internal combustion engine according to a first embodiment of the present invention is applied.
  • the internal combustion engine 1 shown in FIG. 1 is a four-stroke cycle diesel engine.
  • the internal combustion engine 1 is not limited to a diesel engine, and may be another engine such as a gasoline engine.
  • the internal combustion engine 1 is connected to an exhaust passage 2 through which exhaust gas discharged to the atmosphere after combustion in the engine is circulated.
  • the exhaust passage 2 is provided with an addition valve 3 for adding an additive.
  • the addition valve 3 is disposed in the exhaust passage 2 upstream of the exhaust purification catalyst 4 described later, and supplies the additive to the exhaust purification catalyst 4.
  • the addition valve 3 corresponds to the addition part of the present invention.
  • the additive added by the addition valve 3 can be changed according to the exhaust purification catalyst 4. Examples of the additive include a reducing agent such as urea water, a fuel, an oxidizing agent, and the like.
  • An exhaust purification catalyst 4 is provided in the exhaust passage 2 downstream from the addition valve 3. Exhaust gas and the additive added by the addition valve 3 flow into the exhaust purification catalyst 4.
  • the exhaust purification catalyst 4 purifies the exhaust gas by removing, for example, NOx, HC, CO and the like. Examples of the exhaust purification catalyst 4 include a NOx selective reduction catalyst (SCR catalyst), a NOx storage reduction catalyst, an oxidation catalyst, and a three-way catalyst.
  • a dispersion plate 5 is provided in the exhaust passage 2 between the addition valve 3 and the exhaust purification catalyst 4.
  • the dispersion plate 5 mixes and diffuses the additive and exhaust added from the addition valve 3.
  • a notch and a plurality of fins for imparting a swirl flow to the exhaust flowing out of the notch are formed on the substrate.
  • the dispersion plate 5 may be formed with anything other than cuts and fins, and may have any shape or configuration.
  • the addition valve 3 and the dispersion plate 5 are provided in a first exhaust pipe 21 constituting a part of the exhaust passage 2. Specifically, the addition valve 3 is disposed at a bent portion in the middle of the first exhaust pipe 21.
  • the dispersion plate 5 is disposed at the downstream end of the first exhaust pipe 21.
  • the dispersion plate 5 may not necessarily be disposed at the downstream end of the first exhaust pipe 21 as long as it is disposed in the first exhaust pipe 21.
  • the addition valve 3 and the dispersion plate 5 are arranged in the first exhaust pipe 21 to form a unit.
  • the exhaust purification catalyst 4 is provided in the second exhaust pipe 22 constituting a part of the exhaust passage.
  • a part of the exhaust passage 2 serving as a connecting portion connecting the first exhaust pipe 21 and the second exhaust pipe 22 is connected to the downstream end of the first exhaust pipe 21 in which the dispersion plate 5 is disposed at the downstream end.
  • a double pipe structure having an upstream end portion of the second exhaust pipe 22 where the exhaust purification catalyst 4 is disposed as an outer pipe That is, the downstream end of the first exhaust pipe 21 having the dispersion plate 5 disposed at the tip is inserted into the opening of the upstream end of the second exhaust pipe 22 to form a double pipe structure.
  • the 1st exhaust pipe 21 is provided with the 1st flange part 21a which protrudes in the middle part outer periphery.
  • the second exhaust pipe 22 is provided with a second flange portion 22a that protrudes to the outer periphery of the upstream end.
  • These first flange portion 21 a and second flange portion 22 a are joined to connect the first exhaust pipe 21 and the second exhaust pipe 22.
  • welding, fastening with bolts and nuts, or the like is used for joining the first flange portion 21a and the second flange portion 22a.
  • the dropletized additive may leak from the joint surface of the flange portion that sandwiches the dispersion plate.
  • the additive is prevented from adhering to the dispersion plate and forming droplets, and the additive that has been formed into droplets is prevented from leaking from the connecting portion of the exhaust pipe.
  • a part of the exhaust passage 2 is used as an inner pipe at the downstream end of the first exhaust pipe 21 where the dispersion plate 5 is disposed at the downstream end, and the second where the exhaust purification catalyst 4 is disposed.
  • the exhaust pipe 22 is formed in a double pipe structure having an upstream end portion as an outer pipe. Then, the first exhaust pipe 21 is joined by joining the first flange portion 21 a projecting to the outer periphery of the middle portion of the first exhaust pipe 21 and the second flange portion 22 a projecting to the outer periphery of the upstream end of the second exhaust pipe 22. And the second exhaust pipe 22 are connected.
  • the dispersion plate 5 can be disposed in the exhaust passage 2 having a double pipe structure. Thereby, it is possible to suppress the influence of the outside of the exhaust passage 2 from being transmitted to the dispersion plate 5 and cooling the dispersion plate 5. That is, since the dispersion plate 5 does not touch the outside air, the dispersion plate 5 is not affected by the traveling wind of the vehicle, and the dispersion plate 5 is not easily cooled.
  • the dispersion plate 5 and the first flange portion 21a and the second flange portion 22a can be arranged apart from each other.
  • the first flange portion 21a and the second flange portion 22a can be arranged on the upstream side of the exhaust passage 2 having a double pipe structure.
  • the additive added to the exhaust is formed into droplets by the dispersion plate 5
  • the additive that has been formed into droplets is easily carried downstream of the exhaust passage 2 along the flow of the exhaust. Therefore, the dropletized additive goes back between the first exhaust pipe 21 which is the inner pipe and the second exhaust pipe 22 which is the outer pipe in the exhaust passage 2 having a double pipe structure, and the first flange portion 21a and It is difficult to reach the second flange portion 22a.
  • the exhaust passage 2 having a double-pipe structure with a slope that is lowered on the downstream side. Therefore, it can suppress that the additive agent made into droplet leaks from the connection part of the 1st exhaust pipe 21 and the 2nd exhaust pipe 22 joined by the 1st flange part 21a and the 2nd flange part 22a.
  • the first flange portion 21a and the second flange portion 22a and the exhaust purification catalyst 4 can be arranged apart from each other. Since the exhaust purification catalyst 4 has a diameter larger than that of the exhaust passage 2, if the first flange portion 21a and the second flange portion 22a and the exhaust purification catalyst 4 are close to each other, the placement space for the welding jig and for fastening A space such as a work space cannot be provided. However, in this embodiment, since a space can be secured between the first flange portion 21a and the second flange portion 22a and the exhaust purification catalyst 4, assembly work can be facilitated.
  • the dispersion plate 5 is disposed at the downstream end of the first exhaust pipe 21. According to this, the addition valve 3 and the dispersion plate 5 can be arranged further apart. As a result, the additive added by the addition valve 3 is mixed with the exhaust gas for a longer time before reaching the dispersion plate 5 to promote atomization. For this reason, it is possible to prevent the additive reaching the dispersion plate 5 from adhering to the dispersion plate 5 and forming droplets.
  • the addition valve 3 is disposed in the first exhaust pipe 21. According to this, the addition valve 3 and the dispersion plate 5 can be arranged in the first exhaust pipe 21 to be unitized. Thereby, the arrangement relationship between the addition valve 3 and the dispersion plate 5 can be set in advance so that atomization of the additive is promoted only by the first exhaust pipe 21. Moreover, handling can be facilitated by unitization.
  • the exhaust gas purification apparatus for an internal combustion engine according to the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the gist of the present invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

La présente invention porte sur un appareil de conversion des gaz d'échappement d'un moteur à combustion interne. Le but de la présente invention consiste à apporter une technologie pour empêcher la fixation et la formation de gouttelettes d'un additif sur une plaque de dispersion et pour empêcher la fuite de l'additif sous la forme de gouttelettes en passant par une partie de raccordement d'un tuyau d'échappement. Selon la présente invention, une partie d'un passage d'échappement est mise à la forme d'une structure de tube double qui comprend un tube intérieur d'une extrémité aval d'un premier tuyau d'échappement dans lequel la plaque de dispersion est disposée et un tube intérieur d'une extrémité amont d'un second tuyau d'échappement dans lequel est disposé un catalyseur de conversion des gaz d'échappement. Le premier tuyau d'échappement et le second tuyau d'échappement sont attachés l'un à l'autre par l'assemblage d'une première partie bride qui fait saillie sur la circonférence extérieure du premier tuyau d'échappement, dans une position située entre les extrémités de ce tuyau, à une deuxième partie bride qui fait saillie sur la circonférence extérieure du second tuyau d'échappement, à l'extrémité amont de celui-ci.
PCT/JP2011/056811 2011-03-22 2011-03-22 Moteur à combustion interne et dispositif de conversion des gaz d'échappement WO2012127621A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/056811 WO2012127621A1 (fr) 2011-03-22 2011-03-22 Moteur à combustion interne et dispositif de conversion des gaz d'échappement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2011/056811 WO2012127621A1 (fr) 2011-03-22 2011-03-22 Moteur à combustion interne et dispositif de conversion des gaz d'échappement

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WO2012127621A1 true WO2012127621A1 (fr) 2012-09-27

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014118944A (ja) * 2012-12-19 2014-06-30 Mitsubishi Motors Corp 排気管の継手構造
JP2014118943A (ja) * 2012-12-19 2014-06-30 Mitsubishi Motors Corp 排気管の継手構造
CN115210456A (zh) * 2020-03-10 2022-10-18 五十铃自动车株式会社 排气构造

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0180618U (fr) * 1987-11-20 1989-05-30
JPH01115828U (fr) * 1988-01-29 1989-08-04
JP2005214186A (ja) * 2004-02-02 2005-08-11 Tokyo Roki Co Ltd Ｓｃｒマフラー
JP2009024654A (ja) * 2007-07-23 2009-02-05 Bosch Corp 内燃機関の排気浄化装置、ミキサープレート、及びミキサーユニット、並びにミキサープレート用プレス成型装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0180618U (fr) * 1987-11-20 1989-05-30
JPH01115828U (fr) * 1988-01-29 1989-08-04
JP2005214186A (ja) * 2004-02-02 2005-08-11 Tokyo Roki Co Ltd Ｓｃｒマフラー
JP2009024654A (ja) * 2007-07-23 2009-02-05 Bosch Corp 内燃機関の排気浄化装置、ミキサープレート、及びミキサーユニット、並びにミキサープレート用プレス成型装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014118944A (ja) * 2012-12-19 2014-06-30 Mitsubishi Motors Corp 排気管の継手構造
JP2014118943A (ja) * 2012-12-19 2014-06-30 Mitsubishi Motors Corp 排気管の継手構造
CN115210456A (zh) * 2020-03-10 2022-10-18 五十铃自动车株式会社 排气构造

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