JP2014077369A - 排気ガス浄化システム及び排気ガス浄化方法 - Google Patents
排気ガス浄化システム及び排気ガス浄化方法 Download PDFInfo
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- JP2014077369A JP2014077369A JP2012224063A JP2012224063A JP2014077369A JP 2014077369 A JP2014077369 A JP 2014077369A JP 2012224063 A JP2012224063 A JP 2012224063A JP 2012224063 A JP2012224063 A JP 2012224063A JP 2014077369 A JP2014077369 A JP 2014077369A
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- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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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
- 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
- B01D53/9431—Processes characterised by a specific device
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- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
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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
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
【解決手段】内燃機関11の排気ガスGを、前置酸化触媒25を通過させてから排気ガス浄化装置20を通過させると共に、排気ガス浄化装置20の上流側の排気ガスGの第1温度T1が第1設定温度T1cよりも低い場合は、多段昇温噴射を行い、第1温度T1が第1設定温度T1c以上になったら多段昇温噴射に加えてポスト噴射を行って、排気ガス浄化装置20の下流側の排気ガスGの第2温度T2が第2設定温度T2cになるようにポスト噴射をフィードバック制御する。
【選択図】図2
Description
10 エンジン(内燃機関)
16 排気通路
20、20A、20B、20C 排気ガス浄化装置
21 前段酸化触媒(DOC)
22 DPF
23 NOx浄化触媒
24 HC噴射ノズル(排気管内燃料噴射装置)
25 前置酸化触媒(Pre−DOC)
26 第1排気ガス温度センサ
27 第2排気ガス温度センサ
28 第3排気ガス温度センサ
30 制御装置(ECU)
F 炭化水素(HC:軽油:燃料)
G 排気ガス
T1 排気ガスの第1温度
T2 排気ガスの第2温度
T3 排気ガスの第3温度
T1c 第1設定温度
T2c 第2設定温度
T3c 第3設定温度
Tw 冷却水の温度
Twc 冷却水用設定温度
Claims (6)
- 内燃機関の排気通路に、前段酸化触媒と、少なくともNOx浄化触媒かDPFの一方を備えた排気ガス浄化装置を設けると共に、前記内燃機関の運転を制御する制御装置を備えた排気ガス浄化システムにおいて、
前記排気ガス浄化装置の上流側の前記排気通路に、第1排気ガス温度センサと前置酸化触媒と第2排気ガス温度センサを上流側から順に配置して構成し、
前記制御装置を、
前記第1排気ガス温度センサで検出した第1温度が予め設定した第1設定温度よりも低い場合は、筒内燃焼制御で多段昇温噴射を行い、前記第1温度が前記第1設定温度以上になったら前記多段昇温噴射に加えてポスト噴射を行い、前記第2排気ガス温度センサで検出した第2温度が予め設定した第2設定温度になるように前記ポスト噴射をフィードバック制御する第1制御を実施するように構成したことを特徴とする排気ガス浄化システム。 - 前記NOx浄化触媒を備えて前記排気ガス浄化装置を構成し、前記制御装置において、前記第1設定温度を前記前置酸化触媒の触媒活性化温度に、前記第2設定温度を前記NOx浄化触媒の触媒活性が良好な温度にそれぞれ設定すると共に、
前記制御装置を、
前記内燃機関の冷却水の温度が予め設定した冷却水用設定温度より低い時に、前記第1制御を実施し、前記第1制御の実施により、前記第2温度が前記第2設定温度を維持できるようになったら、前記多段昇温噴射と前記ポスト噴射を終了する制御を実施するように構成したことを特徴とする請求項1に記載の排気ガス浄化システム。 - 前記DPFを備えて前記排気ガス浄化装置を構成すると共に、前記DPFより上流側の前記排気通路に、排気管内燃料噴射装置と前記DPFに流入する排気ガスの温度を検出する第3排気ガス温度センサを配置して構成し、前記制御装置において、前記第1設定温度を前記前置酸化触媒の触媒活性化温度に、第2設定温度を前記排気管内燃料噴射装置から噴射される燃料が分解する温度に、第3設定温度を前記DPFに捕集された粒子状物質が燃焼可能となる温度に、それぞれ設定すると共に、
前記制御装置を、
前記内燃機関の低負荷時に、前記第1制御を実施し、前記第1制御の実施により、前記第2温度が前記第2設定温度を維持できるようになったら、前記排気管内燃料噴射装置からの燃料噴射を開始し、前記第3排気ガス温度センサで検出した第3温度が前記第3設定温度になるように前記ポスト噴射をフィードバック制御し、該フィードバック制御の実施中に前記DPFに捕集された粒子状物質が燃焼除去されたか否かを判定し、前記DPFに捕集された粒子状物質が燃焼除去されたと判定したときに、前記多段昇温噴射と前記ポスト噴射を終了する制御を実施するように構成したことを特徴とする請求項1に記載の排気ガス浄化システム。 - 内燃機関から排出される排気ガスを、前段酸化触媒と、少なくともNOx浄化触媒かDPFの一方を備えた排気ガス浄化装置を通過させて浄化する排気ガス浄化方法において、 前記排気ガスを、前置酸化触媒を通過させてから前記排気ガス浄化装置を通過させると共に、
前記排気ガス浄化装置の上流側の第1排気ガス温度センサで検出した第1温度が予め設定した第1設定温度よりも低い場合は、筒内燃焼制御で多段昇温噴射を行い、前記第1温度が前記第1設定温度以上になったら前記多段昇温噴射に加えてポスト噴射を行い、前記排気ガス浄化装置の下流側の第2排気ガス温度センサで検出した温度が予め設定した第2設定温度になるように前記ポスト噴射をフィードバック制御する第1制御を実施することを特徴とする排気ガス浄化方法。 - 前記排気ガスを、前記NOx浄化触媒を備えた前記排気ガス浄化装置を通過させると共に、前記第1設定温度を前記前置酸化触媒の触媒活性化温度に、前記第2設定温度を前記NOx浄化触媒の触媒活性が良好な温度にそれぞれ設定し、
かつ、前記内燃機関の冷却水の温度が予め設定された冷却水用設定温度より低い時に前記第1制御を実施し、前記第1制御の実施により、前記第2温度が前記第2設定温度を維持できるようになったら、前記多段昇温噴射と前記ポスト噴射を終了することを特徴とする請求項4に記載の排気ガス浄化方法。 - 前記排気ガスを、前記DPFを備えた前記排気ガス浄化装置を通過させると共に、 前記第1設定温度を前記前置酸化触媒の触媒活性化温度に、前記第2設定温度を前記排気管内燃料噴射装置から噴射される燃料が分解する温度に、第3設定温度を前記DPFに捕集された粒子状物質が燃焼可能となる温度に、それぞれ設定し、
かつ、前記内燃機関の低負荷時に前記第1制御を実施すると共に、
前記第1制御の実施により、前記第2温度が前記第2設定温度を維持できるようになったら、前記排気ガス浄化装置の上流に設けた前記排気管内燃料噴射装置から燃料噴射を開始し、前記DPFの上流に配置した前記第3排気ガス温度センサで検出した第3温度が前記第3設定温度になるように前記ポスト噴射をフィードバック制御し、該フィードバック制御の実施中に前記DPFに捕集された粒子状物質が燃焼除去されたか否かを判定し、前記DPFに捕集された粒子状物質が燃焼除去されたと判定したときに、前記多段昇温噴射と前記ポスト噴射を終了することを特徴とする請求項4に記載の排気ガス浄化方法。
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