JP5708593B2 - 触媒の劣化診断装置 - Google Patents
触媒の劣化診断装置 Download PDFInfo
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- JP5708593B2 JP5708593B2 JP2012173715A JP2012173715A JP5708593B2 JP 5708593 B2 JP5708593 B2 JP 5708593B2 JP 2012173715 A JP2012173715 A JP 2012173715A JP 2012173715 A JP2012173715 A JP 2012173715A JP 5708593 B2 JP5708593 B2 JP 5708593B2
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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
- 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
- F02D41/1454—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 an oxygen content or concentration or the air-fuel ratio
-
- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/03—Monitoring or diagnosing the deterioration of exhaust systems of sorbing activity of adsorbents or absorbents
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
-
- 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
- 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
-
- 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
-
- 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
- F02D2200/0806—NOx storage amount, i.e. amount of NOx stored on NOx trap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- 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
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
以下、本発明にかかる触媒の劣化診断装置を車載内燃機関の排気浄化装置に適用した第1の実施形態について、図面を参照しつつ説明する。
なお、上式(eq1)では、NOx触媒40に単位時間あたりに流入するNOx量を「NOxin」で示し、NOx触媒40から単位時間あたりに流出するNOx量を「NOxout」で示した。
以下、第2の実施形態について、先の第1の実施形態との相違点を中心に図面を参照しつつ説明する。
なお、上記各実施形態は、以下のように変更して実施してもよい。
Claims (6)
- 内燃機関(10)の排気通路(34)に設けられたNOx吸蔵還元触媒(40)と、
前記触媒の下流側に設けられてかつ排気中の酸素濃度を検出する酸素濃度センサ(46)と、
を備える内燃機関の排気浄化装置に適用され、
前記触媒に吸蔵されたNOxを還元除去すべく、前記内燃機関において燃焼に供されるガスの空燃比を一時的にリッチとするリッチパージ制御を行う制御手段と、
前記リッチパージ制御が実行される状況下、前記酸素濃度センサの検出値に基づき算出された前記触媒の劣化度合い(ΣCO)が所定値(Cdet)を超えたか否かを判断する判断手段と、
複数回の前記リッチパージ制御のそれぞれにおいて前記判断手段によって前記劣化度合いが前記所定値を超えたと判断されたことに基づき、前記触媒が劣化している旨診断する診断手段と、
前記判断手段によって前記劣化度合いが前記所定値を超えたと1回目に判断された後、該判断手段による2回目以降の判断において、前記リッチパージ制御の実行によって前記酸素濃度センサの検出値が理論空燃比近傍の空燃比に対応する値に保持される時間を前記1回目の場合よりも長くする処理を行う伸長手段と、
前記酸素濃度センサ付近の排気温度(Tα)が、前記酸素濃度センサの応答性の低下が解消されたか否かを判断するための閾値温度(Tth)以上となる状態が所定時間継続されたことに基づき、前記伸長手段による前記長くする処理を解除する解除手段とを備えることを特徴とする触媒の劣化診断装置。 - 前記制御手段は、
前記触媒のNOx吸蔵量(ΣNOx)を算出する吸蔵量算出手段を備え、
該吸蔵量算出手段によって算出された前記NOx吸蔵量がその目標値(Σtgt)に到達したことを条件として、前記リッチパージ制御を実行し、
前記伸長手段は、前記長くする処理を、前記目標値を増大させることで行うことを特徴とする請求項1記載の触媒の劣化診断装置。 - 前記伸長手段は、前記長くする処理を、前記内燃機関の排気に含まれる還元剤の前記触媒に対する単位時間あたりの供給量を減少させることで行うことを特徴とする請求項1又は2記載の触媒の劣化診断装置。
- 前記制御手段は、前記内燃機関の排気流量(Gexst)が規定流量(Gmax)未満であることを条件として、前記リッチパージ制御を実行し、
前記伸長手段は、前記長くする処理を、前記規定流量を減少させることで行うことを特徴とする請求項3記載の触媒の劣化診断装置。 - 前記伸長手段は、前記長くする処理を、前記リッチパージ制御が実行される状況下の空燃比を増大させることで行うことを特徴とする請求項3又は4記載の触媒の劣化診断装置。
- 前記制御手段は、前記触媒の温度(Tlnt)が、前記内燃機関の排気に含まれる還元剤が前記触媒を通過しやすくなる懸念がある規定温度(Tmin)を超えることを条件として、前記リッチパージ制御を実行し、
前記伸長手段は、前記長くする処理を、前記規定温度を上昇させることで行うことを特徴とする請求項1〜5のいずれか1項に記載の触媒の劣化診断装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012173715A JP5708593B2 (ja) | 2012-08-06 | 2012-08-06 | 触媒の劣化診断装置 |
DE102013108391.9A DE102013108391B4 (de) | 2012-08-06 | 2013-08-05 | Katalysatordiagnosevorrichtung |
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JP2012173715A JP5708593B2 (ja) | 2012-08-06 | 2012-08-06 | 触媒の劣化診断装置 |
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JP2014031779A JP2014031779A (ja) | 2014-02-20 |
JP5708593B2 true JP5708593B2 (ja) | 2015-04-30 |
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JP2012173715A Active JP5708593B2 (ja) | 2012-08-06 | 2012-08-06 | 触媒の劣化診断装置 |
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DE (1) | DE102013108391B4 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6036772B2 (ja) * | 2013-09-25 | 2016-11-30 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP6526997B2 (ja) * | 2015-03-26 | 2019-06-05 | 本田技研工業株式会社 | 自動二輪車 |
JP6292165B2 (ja) * | 2015-05-07 | 2018-03-14 | 株式会社デンソー | 内燃機関の排気浄化装置 |
JP6536623B2 (ja) | 2017-05-26 | 2019-07-03 | トヨタ自動車株式会社 | NOx吸蔵還元触媒の劣化診断装置 |
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JP3237440B2 (ja) * | 1995-02-28 | 2001-12-10 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP3805562B2 (ja) * | 1999-06-03 | 2006-08-02 | 三菱電機株式会社 | 内燃機関の排気浄化装置 |
JP4178868B2 (ja) | 2002-08-06 | 2008-11-12 | マツダ株式会社 | 内燃機関の排気浄化装置 |
JP2005171802A (ja) * | 2003-12-09 | 2005-06-30 | Toyota Motor Corp | 触媒劣化検出装置 |
JP4193790B2 (ja) * | 2004-11-12 | 2008-12-10 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP4572831B2 (ja) * | 2005-12-26 | 2010-11-04 | 株式会社デンソー | 内燃機関の排気浄化装置 |
JP4650364B2 (ja) * | 2006-07-18 | 2011-03-16 | トヨタ自動車株式会社 | NOx触媒の劣化検出装置 |
JP4832209B2 (ja) * | 2006-08-14 | 2011-12-07 | トヨタ自動車株式会社 | 触媒劣化診断装置 |
DE102010040678A1 (de) * | 2010-09-14 | 2012-03-15 | Robert Bosch Gmbh | Verfahren zur Überwachung der Schadstoff-Konvertierungsfähigkeit in einem Abgasnachbehandlungssystem |
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- 2012-08-06 JP JP2012173715A patent/JP5708593B2/ja active Active
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DE102013108391B4 (de) | 2017-06-08 |
DE102013108391A1 (de) | 2014-02-06 |
JP2014031779A (ja) | 2014-02-20 |
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