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1. WO2013118252 - 内燃機関の排気浄化装置

公開番号 WO/2013/118252
公開日 15.08.2013
国際出願番号 PCT/JP2012/052721
国際出願日 07.02.2012
IPC
F01N 3/08 2006.01
F機械工学;照明;加熱;武器;爆破
01機械または機関一般;機関設備一般;蒸気機関
N機械または機関のためのガス流消音器または排気装置一般;内燃機関用ガス流消音器または排気装置
3排気の清浄,無害化または他の処理をする手段をもつ排気もしくは消音装置
08無害にするためのもの
CPC
B01D 53/9495
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation 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,
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
9495Controlling the catalytic process
F01N 13/009
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
13Exhaust 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
009having two or more separate purifying devices arranged in series
F01N 2240/25
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2240Combination 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
25an ammonia generator
F01N 2430/08
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2430Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
08by modifying ignition or injection timing
F01N 2570/18
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
2570Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
18Ammonia
F01N 3/0814
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
3Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
08for rendering innocuous
0807by using absorbents or adsorbents
0814combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
出願人
  • トヨタ自動車株式会社 TOYOTA JIDOSHA KABUSHIKI KAISHA [JP]/[JP] (AllExceptUS)
  • 櫻井 健治 SAKURAI, Kenji [JP]/[JP] (UsOnly)
発明者
  • 櫻井 健治 SAKURAI, Kenji
代理人
  • 川口 嘉之 KAWAGUCHI, Yoshiyuki
優先権情報
公開言語 (言語コード) 日本語 (JA)
出願言語 (言語コード) 日本語 (JA)
指定国 (国コード)
発明の名称
(EN) EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
(FR) DISPOSITIF DE PURIFICATION D'ÉCHAPPEMENT POUR MOTEUR À COMBUSTION INTERNE
(JA) 内燃機関の排気浄化装置
要約
(EN)
When providing a catalyst that generates NH3 further downstream than a selective reduction NOx catalyst, in order to maintain the overall purification capacity, even if the purification capacity of one of the catalysts decreases, this exhaust emission control device for an internal combustion engine is provided with: an NH3-generating catalyst, which is a catalyst for generating NH3 from NOx; a selective reduction NOx catalyst for reducing NOx as an NH3-reducing agent, said selective reduction NOx catalyst being disposed on an exhaust passage further downstream than the NH3-generating catalyst; and a control device for switching the air-fuel ratio of exhaust that flows into the NH3-generating catalyst between rich and lean on the basis of the amount of NOx stored by the NH3-generating catalyst. If the temperature of the selective reduction NOx catalyst is higher than or lower than the temperature at which NOx can be cleaned up, the control device switches the air-fuel ratio of the exhaust from lean to rich when the NH3-generating catalyst is storing little NOx to a greater extent than when the temperature is such that the NOx can be cleaned up.
(FR)
Selon l'invention, lors de l'utilisation d'un catalyseur qui produit du NH3 plus en aval par rapport à un catalyseur de réduction sélective des NOx, afin de conserver la capacité de purification globale, même si la capacité de purification de l'un des catalyseurs diminue, ce dispositif de purification d'échappement pour un moteur à combustion interne est doté de : un catalyseur produisant du NH3, qui est un catalyseur pour la production de NH3 à partir de NOx ; un catalyseur de réduction sélective des NOx pour la réduction des NOx utilisant NH3 comme agent réducteur, ledit catalyseur de réduction sélective des NOx étant disposé sur un passage d'échappement plus en amont par rapport au catalyseur produisant du NH3 ; et un dispositif de commande pour la commutation du rapport air/carburant de l'échappement qui circule dans le catalyseur produisant du NH3 entre un rapport riche et un rapport pauvre sur la base de la quantité de NOx stockée par le catalyseur produisant du NH3. Si la température du catalyseur de réduction sélective des NOx est supérieure ou inférieure à la température à laquelle les NOx peuvent être purifiés, le dispositif de commande commute le rapport air/carburant de l'échappement d'un rapport pauvre à un rapport riche lorsque le catalyseur produisant du NH3 stocke peu de NOx dans une plus grande mesure que lorsque la température est telle que les NOx peuvent être purifiés.
(JA)
 選択還元型NOx触媒よりも上流にNHを生成する触媒を備えている場合において、一方の触媒の浄化能力が低下したとしても、全体としての浄化能力を維持する。このため、NOxからNHを生成する触媒であるNH生成触媒と、NH生成触媒よりも下流の排気通路に設けられてNHを還元剤としてNOxを還元する選択還元型NOx触媒と、NH生成触媒に流入する排気の空燃比を、NH生成触媒が吸蔵しているNOx量に基づいて、リッチとリーンとに切り替える制御装置と、を備え、制御装置は、選択還元型NOx触媒の温度が、NOxを浄化可能な温度よりも高いとき又は低いときには、NOxを浄化可能な温度のときよりも、NH生成触媒が吸蔵しているNOx量が少ないときに排気の空燃比をリーンからリッチに切り替える。
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