JP4274270B2 - NOx浄化システム及びNOx浄化システムの制御方法 - Google Patents
NOx浄化システム及びNOx浄化システムの制御方法 Download PDFInfo
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- 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]
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- 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
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- 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
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- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/025—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/36—Control for minimising NOx emissions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- 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
Description
)や排気ガス昇温制御で排出される炭化水素(HC)を酸化する。これにより、排気ガスの昇温と、炭化水素の下流側酸化触媒への流入の防止を行って、下流側酸化触媒における一酸化窒素(NO)を酸化するNO酸化活性を向上させる。この下流側酸化触媒で一酸化窒素を二酸化窒素(NO2)に効率よく酸化し、選択還元型NOx触媒(SCR触媒)に流入する排気ガス中のNO:NO2の比率を50:50(=1:1)に近づけて、選択還元型NOx触媒におけるNOxの還元反応の効率を上げる。これにより、NOx浄化システムにおけるNOx浄化性能、特に低温域におけるNOx浄化性能を向上させることができる。また、排気ガス中の炭化水素が酸化されないまま下流側酸化触媒へ流入するのを防止することができる。
2 ディーゼルエンジン(内燃機関)
3 排気ガス通路
4 上流側酸化触媒
5 下流側酸化触媒
6 アンモニア系溶液供給装置
7 選択還元型NOx触媒(SCR触媒)
9 酸素濃度検出センサー
10 排気ガス温度センサー
11 制御装置
Claims (7)
- 排気ガス通路に上流側から順に、酸化触媒と、排気ガス通路にアンモニア系溶液を供給するアンモニア系溶液供給装置と、選択還元型NOx触媒と、シリンダ内燃料噴射を制御する制御装置とを備えた、排気ガス中のNOxを還元するNOx浄化システムにおいて、
前記酸化触媒を2つ設けると共に、
前記制御装置が、上流側酸化触媒により主に排気ガス中の炭化水素を酸化し、下流側酸化触媒により主に排ガス中の一酸化窒素を酸化し、さらに前記上流側酸化触媒の上流に設けた酸素濃度センサーの検出値に基づいて、前記上流側酸化触媒に流入する排気ガスの酸素濃度が、前記上流側酸化触媒が排気ガス中の炭化水素の大部分を酸化する排気ガスの酸素濃度になるようにシリンダ内燃料噴射を制御して、前記選択還元型NOx触媒に流入する一酸化窒素と二酸化窒素の割合を制御することを特徴とするNOx浄化システム。 - 排気ガス通路に上流側から順に、酸化触媒と、排気ガス通路にアンモニア系溶液を供給するアンモニア系溶液供給装置と、選択還元型NOx触媒と、シリンダ内燃料噴射を制御する制御装置とを備えた、排気ガス中のNOxを還元するNOx浄化システムにおいて、
前記酸化触媒を2つ設けると共に、
前記制御装置が、上流側酸化触媒により主に排気ガス中の炭化水素を酸化し、下流側酸化触媒により主に排ガス中の一酸化窒素を酸化し、さらに前記下流側酸化触媒の上流側に設けた排気ガス温度センサーの検出値に基づいて、前記選択還元型NOx触媒に流入する排気ガス中の一酸化窒素と二酸化窒素の割合が50対50になるようにシリンダ内燃料噴射を制御することを特徴とするNOx浄化システム。 - 前記制御装置が、前記下流側酸化触媒の上流側に設けた排気ガス温度センサーの検出値に基づいて、前記選択還元型NOx触媒に流入する排気ガス中の一酸化窒素と二酸化窒素の割合が50対50になるようにシリンダ内燃料噴射を制御することを特徴とする請求項1記載のNOx浄化システム。
- 前記上流側酸化触媒、又は、前記下流側酸化触媒の少なくとも一方に、排気ガス中の粒子状物質を捕集する機能を持たせたことを特徴とする請求項1、2又は3記載のNOx浄化システム。
- 排気ガス通路に上流側から順に、上流側酸化触媒と、下流側酸化触媒と、排気ガス通路にアンモニア系溶液を供給するアンモニア系溶液供給装置と、選択還元型NOx触媒と、シリンダ内燃料噴射を制御する制御装置とを備えた、排気ガス中のNOxを還元するNOx浄化システムの制御方法において、
前記上流側酸化触媒により主に排気ガスの炭化水素を酸化し、前記下流側酸化触媒により主に排気ガス中の一酸化窒素を酸化し、さらに前記上流側酸化触媒の上流に設けた酸素濃度センサーの検出値に基づいて、前記上流側酸化触媒に流入する排気ガスの酸素濃度が、前記上流側酸化触媒が排気ガス中の炭化水素の大部分を酸化する排気ガスの酸素濃度になるようにシリンダ内燃料噴射を制御して、前記選択還元型NOx触媒に流入する一酸化窒素と二酸化窒素の割合を制御することを特徴とするNOx浄化システムの制御方法。 - 排気ガス通路に上流側から順に、上流側酸化触媒と、下流側酸化触媒と、排気ガス通路にアンモニア系溶液を供給するアンモニア系溶液供給装置と、選択還元型NOx触媒と、シリンダ内燃料噴射を制御する制御装置とを備えた、排気ガス中のNOxを還元するNOx浄化システムの制御方法において、
前記上流側酸化触媒により主に排気ガスの炭化水素を酸化し、前記下流側酸化触媒により主に排気ガス中の一酸化窒素を酸化し、さらに前記下流側酸化触媒の上流側に設けた排気ガス温度センサーの検出値に基づいて、前記選択還元型NOx触媒に流入する排気ガス中の一酸化窒素と二酸化窒素の割合が50対50になるようにシリンダ内燃料噴射を制御することを特徴とするNOx浄化システムの制御方法。 - 前記下流側酸化触媒の上流側に設けた排気ガス温度センサーの検出値に基づいて、前記選択還元型NOx触媒に流入する排気ガス中の一酸化窒素と二酸化窒素の割合が50対50になるようにシリンダ内燃料噴射を制御することを特徴とする請求項5記載のNOx浄化システムの制御方法。
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JP2007167570A JP4274270B2 (ja) | 2007-06-26 | 2007-06-26 | NOx浄化システム及びNOx浄化システムの制御方法 |
US12/452,138 US8713916B2 (en) | 2007-06-26 | 2008-05-12 | NOx purification system and method for control of NOx purification system |
AU2008268742A AU2008268742B2 (en) | 2007-06-26 | 2008-05-12 | NOx purification system, and method for control of NOx purification system |
PCT/JP2008/058721 WO2009001623A1 (ja) | 2007-06-26 | 2008-05-12 | NOx浄化システム及びNOx浄化システムの制御方法 |
CN2008800198458A CN101680332B (zh) | 2007-06-26 | 2008-05-12 | NOx净化系统及NOx净化系统的控制方法 |
EP08752601.8A EP2163741A4 (en) | 2007-06-26 | 2008-05-12 | NOX CLEANING SYSTEM AND METHOD FOR CONTROLLING THE NOX CLEANING SYSTEM |
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CN (1) | CN101680332B (ja) |
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US9993771B2 (en) | 2007-12-12 | 2018-06-12 | Basf Corporation | Emission treatment catalysts, systems and methods |
US9863297B2 (en) * | 2007-12-12 | 2018-01-09 | Basf Corporation | Emission treatment system |
DE102007060623B4 (de) | 2007-12-15 | 2011-04-14 | Umicore Ag & Co. Kg | Entstickung von Dieselmotorenabgasen unter Verwendung eines temperierten Vorkatalysators zur bedarfsgerechten NO2-Bereitstellung |
DE102009010517A1 (de) * | 2009-02-25 | 2010-08-26 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Verfahren zum Betrieb eines Abgassystems |
WO2010125659A1 (ja) * | 2009-04-28 | 2010-11-04 | トヨタ自動車株式会社 | エンジンの排気浄化装置 |
JP2010265862A (ja) * | 2009-05-18 | 2010-11-25 | Toyota Industries Corp | 排気ガス浄化装置 |
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AU2008268742B2 (en) | 2011-08-18 |
CN101680332A (zh) | 2010-03-24 |
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US20100101218A1 (en) | 2010-04-29 |
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