US20100199642A1 - Exhaust gas purifying apparatus and method for regenerating particulate filter thereof - Google Patents

Exhaust gas purifying apparatus and method for regenerating particulate filter thereof Download PDF

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Publication number
US20100199642A1
US20100199642A1 US12/700,172 US70017210A US2010199642A1 US 20100199642 A1 US20100199642 A1 US 20100199642A1 US 70017210 A US70017210 A US 70017210A US 2010199642 A1 US2010199642 A1 US 2010199642A1
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United States
Prior art keywords
urea water
exhaust gas
particulate filter
purifying apparatus
oxidation catalyst
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US12/700,172
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English (en)
Inventor
Naotaka Koide
Yoshifumi Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
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Toyota Industries Corp
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Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI reassignment KABUSHIKI KAISHA TOYOTA JIDOSHOKKI ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, YOSHIFUMI, KOIDE, NAOTAKA
Publication of US20100199642A1 publication Critical patent/US20100199642A1/en
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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • 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
    • 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]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

Definitions

  • the present invention relates to an exhaust gas purifying apparatus and method for regenerating particulate filter thereof, and more particularly they are applied to an exhaust gas purifying apparatus using a urea selective catalytic reduction (SCR) system.
  • SCR selective catalytic reduction
  • the urea SCR system has been developed for reducing nitrogen oxides (NO x ) contained in exhaust gas discharged from a diesel engine.
  • the urea SCR system includes a nitrogen monoxide oxidation catalyst (NO oxidation catalyst), a SCR catalyst disposed downstream of the NO oxidation catalyst, a urea water supply system and an ammonia oxidation catalyst disposed downstream of the SCR catalyst.
  • NO oxidation catalyst nitrogen monoxide (NO) is oxidized to form nitrogen dioxide (NO 2 ).
  • NO x and ammonia formed by the reaction of urea with water are reacted to form nitrogen and water.
  • the urea water supply system supplies urea water to the SCR catalyst.
  • the urea SCR system for purifying NO x may also include a diesel particulate filter (DPF) for reducing particulate matter (PM).
  • DPF diesel particulate filter
  • a conventional exhaust gas purifying apparatus including a urea SCR system and a DPF is disclosed in Japanese Patent Application Publication No. 2006-274986.
  • the conventional exhaust gas purifying apparatus when PM deposited on the DPF reaches a predetermined amount, supply of urea water is stopped and diesel fuel (light oil) is supplied to exhaust gas for regenerating the DPF.
  • the present invention is directed to providing an exhaust gas purifying apparatus which can improve efficiency in the use of urea water without deteriorating fuel economy.
  • an exhaust gas purifying apparatus includes an exhaust pipe, a first oxidation catalyst, a selective catalytic reduction (SCR) catalyst, a urea water supply system, a particulate filter (PF) and a controller.
  • Exhaust gas discharged from an internal combustion engine flows through the exhaust pipe.
  • the first oxidation catalyst is disposed in the exhaust pipe.
  • the SCR catalyst is disposed in the exhaust pipe downstream of the first oxidation catalyst.
  • the urea water supply system supplies urea water to the SCR is catalyst.
  • the PF is disposed in the exhaust pipe downstream of the SCR catalyst.
  • the controller stops supplying the urea water from the urea water supply system during regeneration of the PF, so as to supply the NO 2 formed in the first oxidation catalyst to the PF, wherein the NO 2 functions as an oxidizing agent to oxidize particulate matter (PM) deposited on the PF for regenerating the PF.
  • the NO 2 functions as an oxidizing agent to oxidize particulate matter (PM) deposited on the PF for regenerating the PF.
  • the present invention also provides a method for regenerating a PF of an exhaust gas purifying apparatus.
  • the exhaust gas purifying apparatus includes an exhaust pipe, a first oxidation catalyst, a SCR catalyst, a urea water supply system, a PF and a controller.
  • Exhaust gas discharged from an internal combustion engine flows through the exhaust pipe.
  • the first oxidation catalyst is disposed in the exhaust pipe for generating NO 2 .
  • the SCR catalyst is disposed in the exhaust pipe downstream of the first oxidation catalyst.
  • the urea water supply system supplies urea water to the SCR catalyst.
  • the PF is disposed in the exhaust pipe downstream of the SCR catalyst.
  • the controller controls the urea water supply system.
  • the method includes stopping supplying the urea water from the urea water supply system during regeneration of the PF, and supplying the NO 2 formed in the first oxidation catalyst to the PF, wherein the NO 2 functions as an oxidizing agent to oxidize PM deposited on the PF.
  • FIG. 1 is a schematic view showing an exhaust gas purifying apparatus according to a preferred embodiment of the present invention.
  • FIG. 1 shows the exhaust gas purifying apparatus according to the preferred embodiment of the present invention.
  • a diesel engine 1 is an internal combustion engine.
  • the exhaust gas purifying apparatus includes an exhaust pipe 2 , a nitrogen monoxide oxidation catalyst (NO oxidation catalyst) 3 serving as a first oxidation catalyst, a selective catalytic reduction catalyst (SCR catalyst) 4 , an ammonia oxidation catalyst 5 serving as a second oxidation catalyst and a diesel particulate filter (DPF) 6 .
  • NO oxidation catalyst nitrogen monoxide oxidation catalyst
  • SCR catalyst selective catalytic reduction catalyst
  • DPF diesel particulate filter
  • the NO oxidation catalyst 3 , the SCR catalyst 4 , the ammonia oxidation catalyst 5 and the DPF 6 are all disposed in the exhaust pipe 2 through which exhaust gas discharged from the diesel engine 1 flows.
  • An injection nozzle 7 for injecting urea water is disposed between the NO oxidation catalyst 3 and the SCR catalyst 4 and in communication with a urea water tank 9 through a piping 8 .
  • the urea water tank 9 stores therein urea water.
  • a urea water supply device 10 is disposed in the piping 8 and supplies urea water in the urea water tank 9 to the injection nozzle 7 .
  • Pressure sensors 11 , 12 are disposed upstream and downstream of the DPF 6 , respectively, for determining pressure differential between the upstream and downstream of the DPF 6 .
  • the urea water supply device 10 and the pressure sensors 11 , 12 are electrically connected respectively to an electronic control unit (ECU) 14 serving as a controller of the exhaust gas purifying apparatus.
  • the ECU 14 receives signals outputted from the pressure sensors 11 , 12 for detecting pressure differential between the upstream and downstream of the DPF 6 .
  • the injection nozzle 7 , the piping 8 , the urea water tank 9 and the urea water supply device 10 form a urea water supply system for supplying urea water to the SCR catalyst 4 .
  • the urea water supplied to the SCR catalyst 4 is hydrolyzed to form ammonia and carbon dioxide, and then the ammonia and nitrogen oxides (NO x ) in exhaust gas are reacted to form nitrogen and water. If the ammonia is not sufficiently reacted or not consumed in the SCR catalyst 4 , it is forwarded to the ammonia oxidation catalyst 5 and oxidized therein. Subsequently, the exhaust gas flows into the DPF 6 , and particulate matter (PM) in the exhaust gas is deposited on the DPF 6 . Thus, NO x in exhaust gas is reduced, PM is removed from the exhaust gas, and then the purified exhaust gas is discharged into the atmosphere.
  • NO x in exhaust gas is reduced, PM is removed from the exhaust gas, and then the purified exhaust gas is discharged into the atmosphere.
  • the pressure differential between the upstream and downstream of the DPF 6 is increased.
  • the pressure differential determined by the pressure sensors 11 , 12 reaches a predetermined value that is stored in the ECU 14 , the ECU 14 is operated to start the regeneration of the DPF 6 .
  • the ECU 14 is operated to stop the operation of the urea water supply device 10 , so that supply of urea water is stopped during the regeneration of the DPF 6 . In other words, the ECU 14 stops supplying the urea water from the urea water supply device 10 for regenerating the DPF 6 .
  • NO 2 formed in the NO oxidation catalyst 3 is not reduced in the SCR catalyst 4 and then directly flows into the DPF 6 .
  • NO 2 having strong oxidizing properties functions as an oxidizing agent for oxidizing PM in the DPF 6 .
  • PM may be oxidized thereby at a relatively low temperature. Therefore, when the diesel engine 1 continues to be operated and the temperature of exhaust gas is increased, PM deposited on the DPF 6 may be accordingly oxidized without increasing the temperature of exhaust gas by supplying diesel fuel to exhaust gas to oxidize the diesel fuel in oxidation catalyst.
  • the ECU 14 stops supplying the urea water from the urea water supply device 11 in a condition where the temperature of the exhaust gas is as high as the temperature that the NO 2 functions as the oxidizing agent in the DPF 6 .
  • the ECU 14 resume to activate the urea water supply device 10 again to supply urea water to the SCR catalyst 4 at an appropriate timing. Thereafter, the above-described operation is repeated for regenerating the DPF 6 .
  • NO 2 formed in the NO oxidation catalyst 3 and then flowed into the SCR catalyst 4 functions as an oxidizing agent to oxidize PM deposited on the DPF 6 .
  • PM may be oxidized at a relatively low temperature, so that there is no need to oxidize diesel fuel in oxidation catalyst thereby to increase the temperature of exhaust gas.
  • stop of supplying urea water during the regeneration of the DPF 6 improves the efficiency in the use of urea water and there is no need to supply diesel fuel to exhaust gas, with the result deterioration of fuel economy may be prevented.

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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)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
US12/700,172 2009-02-09 2010-02-04 Exhaust gas purifying apparatus and method for regenerating particulate filter thereof Abandoned US20100199642A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009027611A JP2010180861A (ja) 2009-02-09 2009-02-09 排気ガス浄化装置
JP2009-027611 2009-02-09

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US20100199642A1 true US20100199642A1 (en) 2010-08-12

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US (1) US20100199642A1 (fr)
EP (1) EP2216520A1 (fr)
JP (1) JP2010180861A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140053536A1 (en) * 2012-03-28 2014-02-27 Dearborn Financial, Inc. Diesel emissions control after-treatment systems and related method
US20160281563A1 (en) * 2013-03-20 2016-09-29 Audi Ag Exhaust system for an internal combustion engine of a motor vehicle and method for operating an exhaust system
US9815332B2 (en) 2015-08-18 2017-11-14 Takeuchi Mfg. Co., Ltd. Working vehicle
WO2019222778A1 (fr) * 2018-05-22 2019-11-28 Avl List Gmbh Procédé et dispositif de régulation d'un système de post-traitement des gaz d'échappement
US11105236B2 (en) 2016-12-21 2021-08-31 Perkins Engine Company Limited Selective catalytic reduction system
CN113339114A (zh) * 2021-06-29 2021-09-03 一汽解放汽车有限公司 再生保护系统及车辆

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2414160T3 (es) * 2009-02-20 2013-07-18 Haldor Topsøe A/S Método para purificación de gas de escape de un motor diesel
FR2956039B1 (fr) * 2010-02-08 2014-08-29 Peugeot Citroen Automobiles Sa Procede de traitement des gaz d'echappement contenant des oxydes d'azote
JP5778951B2 (ja) * 2010-10-08 2015-09-16 日野自動車株式会社 排ガス浄化装置
SE538193C2 (sv) * 2012-07-05 2016-03-29 Scania Cv Ab SCR-system och förfarande vid ett SCR-system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003003832A (ja) * 2001-06-20 2003-01-08 Isuzu Motors Ltd ディーゼルエンジンの連続再生式ディーゼルパティキュレートフィルタ
JP2004218475A (ja) * 2003-01-10 2004-08-05 Isuzu Motors Ltd 内燃機関の排気ガス浄化システム及び内燃機関の排気ガス浄化方法
DE10348492B4 (de) * 2003-10-18 2005-10-06 Adam Opel Ag Abgasreinigungssystem mit einem regenerierbaren Partikelfilter
JP2006274986A (ja) 2005-03-30 2006-10-12 Mitsubishi Fuso Truck & Bus Corp 排気後処理装置
JP4651560B2 (ja) * 2006-03-06 2011-03-16 三菱ふそうトラック・バス株式会社 内燃機関の排気浄化装置
JP4900002B2 (ja) * 2007-04-05 2012-03-21 トヨタ自動車株式会社 内燃機関の排気浄化システム
EP2014348A2 (fr) * 2007-06-22 2009-01-14 Paul Scherer Institut Procédé et système pour le traitement d'un gaz d'échappement contenant des suies NOx

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140053536A1 (en) * 2012-03-28 2014-02-27 Dearborn Financial, Inc. Diesel emissions control after-treatment systems and related method
US20160281563A1 (en) * 2013-03-20 2016-09-29 Audi Ag Exhaust system for an internal combustion engine of a motor vehicle and method for operating an exhaust system
US9815332B2 (en) 2015-08-18 2017-11-14 Takeuchi Mfg. Co., Ltd. Working vehicle
US11105236B2 (en) 2016-12-21 2021-08-31 Perkins Engine Company Limited Selective catalytic reduction system
WO2019222778A1 (fr) * 2018-05-22 2019-11-28 Avl List Gmbh Procédé et dispositif de régulation d'un système de post-traitement des gaz d'échappement
CN113339114A (zh) * 2021-06-29 2021-09-03 一汽解放汽车有限公司 再生保护系统及车辆

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JP2010180861A (ja) 2010-08-19
EP2216520A1 (fr) 2010-08-11

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Owner name: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, JAPAN

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Effective date: 20100126

STCB Information on status: application discontinuation

Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION