JP4530081B2 - 内燃機関の触媒劣化診断装置及び触媒劣化診断方法 - Google Patents
内燃機関の触媒劣化診断装置及び触媒劣化診断方法 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
- 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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- 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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- 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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- 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
- F02D41/1447—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 with determination means using an estimation
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- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
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- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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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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- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
- F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
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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
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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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
- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
- F02D2200/0804—Estimation of the temperature of the exhaust gas treatment 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
- 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
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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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- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Processes For Solid Components From Exhaust (AREA)
Description
3 燃料噴射弁
4 吸気マニホルド
5 排気マニホルド
11 上流側触媒コンバータ
12 酸化触媒
13 排気管
14 下流側触媒コンバータ
15 パティキュレートフィルタ
16 燃料供給装置
43、44、45 温度センサ
46 差圧センサ
Claims (16)
- 流入する排気ガス中の成分を酸化する酸化触媒と、該酸化触媒に流入する排気ガス中に還元剤を供給可能な還元剤供給手段とを備える排気浄化装置の触媒劣化診断装置において、酸化触媒から流出する排気ガスの温度又は酸化触媒の出口温度である流出排気温度を検出又は推定する流出排気温度検出手段と、流出排気温度検出手段の検出値又は推定値に基づいて酸化触媒の劣化を診断する触媒劣化診断手段とを具備し、
上記触媒劣化診断手段は、還元剤供給手段からの還元剤の供給中に酸化触媒に流入する排気ガスの温度又は酸化触媒の入口温度である流入排気温度が高温側領域にあるときに流出排気温度検出手段によって検出又は推定された温度である高温流入時排気温度と、還元剤供給手段からの還元剤の供給中に流入排気温度が上記高温側領域よりも低い低温側領域にあるときに流出排気温度検出手段によって検出又は推定された温度である低温流入時排気温度とに基づいて酸化触媒の劣化を診断する、触媒劣化診断装置。 - 上記触媒劣化診断手段は、高温流入時排気温度と目標温度との差分又は比と、低温流入時排気温度と目標温度との差分又は比とに基づいて酸化触媒の劣化を診断する、請求項1に記載の触媒劣化診断装置。
- 上記触媒劣化診断手段は、上記高温流入時排気温度と目標温度との差分又は比が上記低温流入時排気温度と目標温度との差分又は比よりも一定値以上大きいとき、又は上記高温流入時排気温度と目標温度との差分又は比に対する上記低温流入時排気温度と目標温度との差分又は比の割合が一定値以上であるときに酸化触媒が劣化していると判断する、請求項2に記載の触媒劣化診断装置。
- 上記還元剤供給手段からの還元剤の供給量は、流入排気温度と目標温度とに基づいて制御される、請求項1〜3のいずれか1項に記載の触媒劣化診断装置。
- 上記還元剤供給手段からの還元剤の供給量は、流出排気温度が目標温度になるように制御される、請求項4に記載の触媒劣化診断装置。
- 上記流出排気温度検出手段によって高温流入時排気温度及び低温流入時排気温度を検出又は推定するときには、目標温度が一定に維持される、請求項1〜5のいずれか1項に記載の触媒劣化診断装置。
- 流入排気温度を制御する流入排気温度制御手段を具備し、該流入排気温度制御手段は流入排気温度を高温側領域に維持する高温維持処理と、流入排気温度を低温側領域に維持する低温維持処理とを実行可能であり、
上記触媒劣化診断手段によって酸化触媒の劣化を判断するときには、これら高温維持処理と低温維持処理とが連続的に行われる、請求項1〜6のいずれか1項に記載の触媒劣化診断装置。 - 上記触媒劣化診断手段によって酸化触媒の劣化を判断するときには、高温維持処理の後に低温維持処理が行われる、請求項7に記載の触媒劣化診断装置。
- 上記流入排気温度制御手段は、低温維持処理として、内燃機関の通常運転を行うと共に通常運転によっては流入排気温度が低温側領域内に維持されないときには機関本体から排出される排気ガスの温度を低下させる制御を行う、請求項7又は8に記載の触媒劣化診断装置。
- 上記流入排気温度を変化させた場合又は還元剤供給手段からの還元剤供給量を変化させた場合には、上記触媒劣化診断手段はこれら変化の後の吸入空気量の積算値が基準値以上となるまでは、流出排気温度検出手段によって検出又は推定された温度を酸化触媒の劣化の診断に用いない、請求項1〜9のいずれか1項に記載の触媒劣化診断装置。
- 上記流入排気温度を変化させた場合又は還元剤供給手段からの還元剤供給量を変化させた場合には、上記触媒劣化診断手段はこれら変化の後の運転時間が基準時間以上となるまでは、流出排気温度検出手段によって検出又は推定された温度を酸化触媒の劣化の診断に用いない、請求項1〜9のいずれか1項に記載の触媒劣化診断装置。
- 上記流入排気温度を変化させた場合又は還元剤供給手段からの還元剤供給量を変化させた場合には、上記触媒劣化診断手段はこれら変化の後の燃料及び還元剤の供給総量が基準量以上となるまでは、流出排気温度検出手段によって検出又は推定された温度を酸化触媒の劣化の診断に用いない、請求項1〜9のいずれか1項に記載の触媒劣化診断装置。
- 上記酸化触媒の排気下流側にパティキュレートフィルタが設けられ、上記触媒劣化診断手段による酸化触媒の劣化診断は該パティキュレートフィルタの再生処理時に行われる、請求項1〜12のいずれか1項に記載の触媒劣化診断装置。
- 上記酸化触媒はパティキュレートフィルタに担持され、上記触媒劣化診断手段による酸化触媒の劣化診断は該パティキュレートフィルタの再生処理時に行われる、請求項1〜12のいずれか1項に記載の触媒劣化診断装置。
- 上記酸化触媒はNOXを吸蔵可能なNOX吸蔵還元剤と共に担体に担持され、上記触媒劣化診断手段による酸化触媒の劣化診断は、NOX吸蔵還元剤に吸蔵されているSOXを放出するSOX放出処理時に行われる、請求項1〜12のいずれか1項に記載の触媒劣化診断装置。
- 流入する排気ガス中の成分を酸化する酸化触媒と、該酸化触媒に流入する排気ガス中に還元剤を供給する還元剤供給手段とを備える排気浄化装置の触媒劣化診断方法において、
還元剤供給手段からの還元剤の供給中に酸化触媒に流入する排気ガスの温度又は酸化触媒の入口温度である流入排気温度が高温側領域にあるときに酸化触媒から流出する排気ガスの温度又は酸化触媒の出口温度である流出排気温度を検出又は推定する工程と、
還元剤供給手段からの還元剤の供給中に流入排気温度が上記高温側領域よりも低温の低温側領域にあるときの流出排気温度を検出又は推定する工程と、
流入排気温度が高温側領域にあるときの流出排気温度と、流入排気温度が低温側領域にあるときの流出排気温度とに基づいて酸化触媒の劣化を診断する工程とを具備する、触媒劣化診断方法。
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JP2008192640A JP4530081B2 (ja) | 2008-07-25 | 2008-07-25 | 内燃機関の触媒劣化診断装置及び触媒劣化診断方法 |
EP09786043.1A EP2318677B1 (en) | 2008-07-25 | 2009-07-22 | Catalyst deterioration diagnosis system and method for internal combustion engine |
PCT/IB2009/006315 WO2010010448A1 (en) | 2008-07-25 | 2009-07-22 | Catalyst deterioration diagnosis system and method for internal combustion engine |
CN200980128921.3A CN102105663B (zh) | 2008-07-25 | 2009-07-22 | 用于内燃发动机的催化剂劣化诊断系统及方法 |
US13/055,062 US8490385B2 (en) | 2008-07-25 | 2009-07-22 | Catalyst deterioration diagnosis system and method for internal combustion engine |
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CN102105663B (zh) | 2014-01-01 |
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WO2010010448A1 (en) | 2010-01-28 |
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