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1. JP2009293513 - EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

Office
Japan
Application Number 2008147854
Application Date 05.06.2008
Publication Number 2009293513
Publication Date 17.12.2009
Grant Number 4558816
Grant Date 30.07.2010
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
B01D 53/94
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 or aerosols
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
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
CPC
F01N 3/208
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
2066Selective catalytic reduction [SCR]
208Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
F01N 2610/02
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
2610Adding substances to exhaust gases
02the substance being ammonia or urea
F01N 2900/0408
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
2900Details of electrical control or of the monitoring of the exhaust gas treating apparatus
04Methods of control or diagnosing
0408using a feed-back loop
F01N 2900/1602
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
2900Details of electrical control or of the monitoring of the exhaust gas treating apparatus
06Parameters used for exhaust control or diagnosing
16said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
1602Temperature of exhaust gas apparatus
Y02T 10/12
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
10Road transport of goods or passengers
10Internal combustion engine [ICE] based vehicles
12Improving ICE efficiencies
Applicants NIPPON SOKEN INC
株式会社SOKEN
DENSO CORP
株式会社デンソー
Inventors FUJITA TATSUYA
藤田 達也
MARUYAMA MASATOSHI
丸山 昌利
Agents 山田 強
Title
(EN) EXHAUST 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 improve a NOx purification rate adding a suitable reducing agent while suppressing the influence on an internal combustion engine.

SOLUTION: An SCR catalyst 42 is provided in an exhaust pipe 22 of an engine, and a urea water adding valve 44 is provided upstream. Urea water is supplied by pressurization by a urea water pump 53 to the urea water adding valve 44. In an ECU 60, a temperature of the SCR catalyst 42 is detected, and a urea water pressure pressurized by the urea water pump 53 based on the SCR catalyst is changed based on the SCR catalyst temperature. At this time, if the SCR catalyst temperature is in a predetermined low temperature region, the urea water pressure is raised, and an atomization particle size of the urea water to be added from the urea water adding valve 44 is changed.

COPYRIGHT: (C)2010,JPO&INPIT

(JA)

【課題】内燃機関への影響を抑制しつつ好適なる還元剤の添加を行い、ひいてはNOx浄化率を向上させる。
【解決手段】エンジンの排気管22にはSCR触媒42が設けられるとともに、その上流側に尿素水添加弁44が設けられている。尿素水添加弁44には尿素水ポンプ53により尿素水が加圧供給される。ECU60は、SCR触媒42の温度を検出し、そのSCR触媒温度に基づいて尿素水ポンプ53により加圧される尿素水圧力を変更する。このとき、SCR触媒温度が所定の低温域にあれば、尿素水圧力が高圧化され、尿素水添加弁44から添加される尿素水の噴霧粒径が変更される。
【選択図】 図1

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