US20150108384A1 - Variable exhaust mixing device - Google Patents

Variable exhaust mixing device Download PDF

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Publication number
US20150108384A1
US20150108384A1 US14/396,164 US201214396164A US2015108384A1 US 20150108384 A1 US20150108384 A1 US 20150108384A1 US 201214396164 A US201214396164 A US 201214396164A US 2015108384 A1 US2015108384 A1 US 2015108384A1
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Prior art keywords
exhaust
mixing
mixing device
variable
variable exhaust
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Abandoned
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US14/396,164
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Craig Alan Reeves
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International Engine Intellectual Property Co LLC
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International Engine Intellectual Property Co LLC
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Assigned to INTERNATIONAL ENGINE INTELLECTUAL COMPANY, LLC. reassignment INTERNATIONAL ENGINE INTELLECTUAL COMPANY, LLC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REEVES, CRAIG ALAN
Publication of US20150108384A1 publication Critical patent/US20150108384A1/en
Assigned to JPMORGAN CHASE BANK N.A., AS COLLATERAL AGENT reassignment JPMORGAN CHASE BANK N.A., AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC, INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC, NAVISTAR INTERNATIONAL CORPORATION
Assigned to NAVISTAR INTERNATIONAL CORPORATION, INTERNATIONAL TRUCK INTELLECTUAL PROPERTY COMPANY, LLC, INTERNATIONAL ENGINE INTELLECTUAL PROPERTY COMPANY, LLC reassignment NAVISTAR INTERNATIONAL CORPORATION RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
Abandoned legal-status Critical Current

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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
    • F01N3/103—Oxidation catalysts for HC and CO only
    • 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
    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/14—Exhaust treating devices having provisions not otherwise provided for for modifying or adapting flow area or back-pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • 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
    • 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
    • Y02T10/40—Engine management systems
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0402—Cleaning, repairing, or assembling
    • Y10T137/0491—Valve or valve element assembling, disassembling, or replacing
    • Y10T137/0525—Butterfly valve

Definitions

  • a Diesel Oxidation Catalyst uses a chemical process to break down pollutants from diesel engines in the exhaust stream, turning them into less harmful components.
  • the DOC is normally a honeycomb shaped configuration coated in a catalyst designed to trigger a chemical reaction to reduce particulate matter.
  • a DOC is an exhaust aftertreatment device for diesel engines and contains palladium and platinum which serve as catalysts to oxidize hydrocarbons and carbon monoxide into carbon dioxide and water.
  • dosed fuel may be provided to the DOC to improve DOC performance.
  • DOC DOC
  • a variable exhaust mixing system includes a butterfly valve positioned in an exhaust stream.
  • the butterfly valve is opened more to decrease mixing and closed more to increase mixing.
  • the increased mixing provided by the variable exhaust mixing device allows the injection of dosed fuel into the exhaust stream at a lower exhaust flow rate.
  • FIG. 1 illustrates a variable exhaust mixing system
  • FIG. 2 illustrates the DOC inlet temperature, the Pre-DOC out temperature, the Pre-DOC in temperature, and the engine speed in rpm.
  • FIG. 1 illustrates a variable exhaust mixing system 100 .
  • FIG. 1 includes a turbocharger 110 , an exhaust stream 120 , a variable exhaust mixing device 130 , a device controller 140 , a dosing valve 150 , dosed fuel 160 , and a Diesel Oxidation Catalyst (DOC) 170 .
  • DOC Diesel Oxidation Catalyst
  • the exhaust stream 120 downstream of the turbocharger 110 passes through a variable exhaust mixing device 130 that is controlled by a device control 140 .
  • the exhaust stream 120 continues to a dosing valve 150 where dosed fuel 160 is provided to the exhaust stream 120 before the exhaust stream 120 enters the DOC 170 .
  • variable exhaust mixing device 130 provides better mixing of the dosed fuel into the exhaust flow, which allows significantly improved conversion in the DOC 170 .
  • the variable exhaust mixing device is a piece of hardware placed in the exhaust system, downstream of the turbocharger and upstream of the dosing valve, which creates swirl in the exhaust.
  • variable exhaust mixing device 130 is a butterfly valve placed in the exhaust stream, which may be commanded to open and close to different positions. This valve improves the mixing of the fuel into the exhaust stream and provides a wider range of engine operation where fuel may be injected. Additionally, the valve is controlled in an embodiment by software provided by the device controller 140 .
  • variable exhaust mixing device allows the injection of fuel at low flow.
  • FIG. 2 illustrates the DOC inlet temperature 210 , the Pre-DOC out temperature 220 , the Pre-DOC in temperature 230 , and the engine speed in rpm 240 .
  • the improved conversion due to the variable exhaust mixing device is shown in FIG. 2 . More specifically, an approximately 90 C additional temperature out of the DOC was achieved under the same conditions when using a mixing device.
  • the valve changes orientation based on engine operation. For example, low exhaust flow is provided with more aggressive mixing (the butterfly valve is closed more) which may not be possible at higher flows due to backpressure, for example. Consequently, based on exhaust flow, the valve is controlled to change its orientation to produce greater or lesser mixing.
  • the ability to produce variable mixing increases the exhaust flow range in which fuel may be injected.
  • the fuel may now be injected over the entire exhaust flow operating range as opposed to not being able to be injected at flows below about 300 kg/hr, for example.
  • valves may be employed such as a gate valve or disc valve. Additionally, multiple types of valves may be employed.

Abstract

A system and method for variable exhaust mixing is provided. A variable exhaust mixing device including a butterfly valve is positioned in an exhaust stream and the butterfly valve is opened more to decrease mixing and closed more to increase mixing. The increased mixing provided by the variable exhaust mixing device allows the injection of dosed fuel into the exhaust stream at a lower exhaust flow rate.

Description

    BACKGROUND
  • A Diesel Oxidation Catalyst (DOC) uses a chemical process to break down pollutants from diesel engines in the exhaust stream, turning them into less harmful components. The DOC is normally a honeycomb shaped configuration coated in a catalyst designed to trigger a chemical reaction to reduce particulate matter. More specifically, a DOC is an exhaust aftertreatment device for diesel engines and contains palladium and platinum which serve as catalysts to oxidize hydrocarbons and carbon monoxide into carbon dioxide and water.
  • Additionally, dosed fuel may be provided to the DOC to improve DOC performance. However, there are limitations on how much fuel can be dosed depending on exhaust flow and temperature
    • SUMMARY
  • A variable exhaust mixing system is provided that includes a butterfly valve positioned in an exhaust stream. The butterfly valve is opened more to decrease mixing and closed more to increase mixing. The increased mixing provided by the variable exhaust mixing device allows the injection of dosed fuel into the exhaust stream at a lower exhaust flow rate.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 illustrates a variable exhaust mixing system.
  • FIG. 2 illustrates the DOC inlet temperature, the Pre-DOC out temperature, the Pre-DOC in temperature, and the engine speed in rpm.
    •  DETAILED DESCRIPTION
  • FIG. 1 illustrates a variable exhaust mixing system 100. FIG. 1 includes a turbocharger 110, an exhaust stream 120, a variable exhaust mixing device 130, a device controller 140, a dosing valve 150, dosed fuel 160, and a Diesel Oxidation Catalyst (DOC) 170.
  • In operation, the exhaust stream 120 downstream of the turbocharger 110 passes through a variable exhaust mixing device 130 that is controlled by a device control 140. The exhaust stream 120 continues to a dosing valve 150 where dosed fuel 160 is provided to the exhaust stream 120 before the exhaust stream 120 enters the DOC 170.
  • During operation, the variable exhaust mixing device 130 provides better mixing of the dosed fuel into the exhaust flow, which allows significantly improved conversion in the DOC 170. As shown in FIG. 1, the variable exhaust mixing device is a piece of hardware placed in the exhaust system, downstream of the turbocharger and upstream of the dosing valve, which creates swirl in the exhaust.
  • In one embodiment, the variable exhaust mixing device 130 is a butterfly valve placed in the exhaust stream, which may be commanded to open and close to different positions. This valve improves the mixing of the fuel into the exhaust stream and provides a wider range of engine operation where fuel may be injected. Additionally, the valve is controlled in an embodiment by software provided by the device controller 140.
  • Additionally, the variable exhaust mixing device allows the injection of fuel at low flow.
  • FIG. 2 illustrates the DOC inlet temperature 210, the Pre-DOC out temperature 220, the Pre-DOC in temperature 230, and the engine speed in rpm 240. The improved conversion due to the variable exhaust mixing device is shown in FIG. 2. More specifically, an approximately 90 C additional temperature out of the DOC was achieved under the same conditions when using a mixing device.
  • With regard to the software control of the valve, in an embodiment, the valve changes orientation based on engine operation. For example, low exhaust flow is provided with more aggressive mixing (the butterfly valve is closed more) which may not be possible at higher flows due to backpressure, for example. Consequently, based on exhaust flow, the valve is controlled to change its orientation to produce greater or lesser mixing.
  • Additionally, the ability to produce variable mixing increases the exhaust flow range in which fuel may be injected. For example, the fuel may now be injected over the entire exhaust flow operating range as opposed to not being able to be injected at flows below about 300 kg/hr, for example.
  • Additionally, although a butterfly valve has been discussed above, other types of valves may be employed such as a gate valve or disc valve. Additionally, multiple types of valves may be employed.

Claims (12)

1. A variable exhaust mixing system including:
a variable exhaust mixing device positioned in an exhaust stream;
wherein said variable exhaust mixing device is controlled to decrease the amount of mixing of said exhaust stream with increasing exhaust flow.
2. The system of claim 1 wherein a device control controls said variable exhaust mixing device.
3. The system of claim 1 wherein a dosing valve is present in the exhaust stream downstream of said variable exhaust mixing device.
4. The system of claim 3 wherein said dosing valve provides dosed fuel into the exhaust stream.
5. The system of claim 1 wherein said variable exhaust mixing device is a butterfly valve.
6. The system of claim 5 wherein said butterfly valve is opened more to decrease mixing
7. The system of claim 5 wherein said butterfly valve is closed more to increase mixing.
8. The system of claim 1 wherein said variable exhaust mixing device is located downstream from a turbocharger.
9. The system of claim 1 wherein said variable exhaust mixing device is located upstream of a Diesel Oxidation Catalyst (DOC).
10. A method for producing variable mixing of an exhaust stream, said method including:
positioning a variable exhaust mixing device in an exhaust stream, wherein said variable exhaust mixing device is a butterfly valve.
11. The method of claim 10 wherein said butterfly valve is opened more to decrease mixing
12. The method of claim 10 wherein said butterfly valve is closed more to increase mixing.
US14/396,164 2012-04-26 2012-04-26 Variable exhaust mixing device Abandoned US20150108384A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10876482B2 (en) * 2015-09-04 2020-12-29 Innio Jenbacher Gmbh & Co Og Internal combustion engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6109027A (en) * 1998-02-17 2000-08-29 Diesel Engine Retarders, Inc. Exhaust restriction device
US20050045407A1 (en) * 2003-08-28 2005-03-03 Bulicz Tytus R. Clean, low-pressure EGR in a turbocharged engine by back-pressure control
US20060130459A1 (en) * 2004-12-21 2006-06-22 Detroit Diesel Corporation Method and system for controlling temperatures of exhaust gases emitted from internal combustion engine to facilitate regeneration of a particulate filter
US20100269489A1 (en) * 2009-04-22 2010-10-28 Gm Global Technology Operations, Inc. Oxidation catalyst outlet temperature correction systems and methods
US20110061372A1 (en) * 2009-09-14 2011-03-17 Gm Global Technology Operations, Inc. Intrusive scr efficency testing systems and methods for vehicles with low temperature exhaust gas
US20110252765A1 (en) * 2010-04-14 2011-10-20 International Engine Intellectual Property Company , Llc Exhaust throttle valve system and method for diesel particulate filter regeneration
US20110289914A1 (en) * 2010-05-28 2011-12-01 Caterpillar Inc. Upstream egr restriction

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008036884A1 (en) * 2008-08-07 2010-02-11 Daimler Ag Method for operating an emission control system with an SCR catalytic converter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6109027A (en) * 1998-02-17 2000-08-29 Diesel Engine Retarders, Inc. Exhaust restriction device
US20050045407A1 (en) * 2003-08-28 2005-03-03 Bulicz Tytus R. Clean, low-pressure EGR in a turbocharged engine by back-pressure control
US20060130459A1 (en) * 2004-12-21 2006-06-22 Detroit Diesel Corporation Method and system for controlling temperatures of exhaust gases emitted from internal combustion engine to facilitate regeneration of a particulate filter
US20100269489A1 (en) * 2009-04-22 2010-10-28 Gm Global Technology Operations, Inc. Oxidation catalyst outlet temperature correction systems and methods
US20110061372A1 (en) * 2009-09-14 2011-03-17 Gm Global Technology Operations, Inc. Intrusive scr efficency testing systems and methods for vehicles with low temperature exhaust gas
US20110252765A1 (en) * 2010-04-14 2011-10-20 International Engine Intellectual Property Company , Llc Exhaust throttle valve system and method for diesel particulate filter regeneration
US20110289914A1 (en) * 2010-05-28 2011-12-01 Caterpillar Inc. Upstream egr restriction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10876482B2 (en) * 2015-09-04 2020-12-29 Innio Jenbacher Gmbh & Co Og Internal combustion engine

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