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1. JP2000240429 - EXHAUST GAS EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

Office
Japan
Application Number 1999046181
Application Date 24.02.1999
Publication Number 2000240429
Publication Date 05.09.2000
Grant Number 3518391
Grant Date 06.02.2004
Publication Kind B2
IPC
F01N 3/08
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
3Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
08for rendering innocuous
F01N 3/20
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
10by thermal or catalytic conversion of noxious components of exhaust
18characterised by methods of operation; Control
20specially adapted for catalytic conversion
F01N 3/28
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
10by thermal or catalytic conversion of noxious components of exhaust
24characterised by constructional aspects of converting apparatus
28Construction of catalytic reactors
F01N 3/36
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
10by thermal or catalytic conversion of noxious components of exhaust
24characterised by constructional aspects of converting apparatus
36Arrangements for supply of additional fuel
Applicants TOYOTA MOTOR CORP
トヨタ自動車株式会社
Inventors ISHIYAMA SHINOBU
石山 忍
TSUKASAKI YUKIHIRO
塚崎 之弘
TAWARA ATSUSHI
田原 淳
KOBAYASHI MASAAKI
小林 正明
Agents 石田 敬
島田 哲郎
戸田 利雄
西山 雅也
Title
(EN) EXHAUST GAS EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
(JA) 内燃機関の排気浄化装置
Abstract
(EN)

PROBLEM TO BE SOLVED: To perform efficient regeneration of an NOX occlusion reduction catalyst regardless of an exhaust gas temperature.

SOLUTION: An NOX occlusion reduction catalyst 7 is arranged in the exhaust passage 3 of an engine 1 and absorbs NOX contained in exhaust gas from an engine under lean air-fuel ratio operation. When an NOX occlusion amount of the catalyst 7 is increased, a liquid reducing agent (diesel oil) is injected in an exhaust passage on the upper stream side of the catalyst 7 through a reducing agent injection valve 91 and NOX is emitted from the catalyst 7 for reduction purification. An electronic control unit(ECU) 30 calculates the temperature of exhaust gas flowing in the catalyst 7 based on an engine running state and the more a calculated exhaust gas temperature is lower, the more an injection pressure of the reducing agent injection valve is increased and the grain size of injected reducing agent particles is decreased. By decreasing the grain size, the injected reducing agent particles are easily evaporated even at a low exhaust gas temperature. Since liquid reducing agent particles are prevented from reaching the catalyst 7, the reduction agent supplied to the catalyst 7 is effectively utilized.

COPYRIGHT: (C)2000,JPO