JP4607541B2 - 三元触媒の劣化診断方法 - Google Patents
三元触媒の劣化診断方法 Download PDFInfo
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- JP4607541B2 JP4607541B2 JP2004311489A JP2004311489A JP4607541B2 JP 4607541 B2 JP4607541 B2 JP 4607541B2 JP 2004311489 A JP2004311489 A JP 2004311489A JP 2004311489 A JP2004311489 A JP 2004311489A JP 4607541 B2 JP4607541 B2 JP 4607541B2
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- way catalyst
- exhaust gas
- deterioration
- combustion exhaust
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- Exhaust Gas After Treatment (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
Claims (4)
- 内燃機関から排出される燃焼排気ガスの排気流路の内部に配設され、前記燃焼排気ガスを浄化する三元触媒の劣化の程度を診断する三元触媒の劣化診断方法であって、
前記排気流路の内部の前記三元触媒より上流側と下流側とに、前記燃焼排気ガスに含まれる窒素酸化物の濃度を連続的に測定可能な検出器を配設して、前記内燃機関が希薄燃焼状態において、前記排気流路の前記三元触媒より上流側と下流側とにおける前記燃焼排気ガスに含まれる窒素酸化物の濃度を測定し、得られた前記窒素酸化物の濃度の変動により前記三元触媒の劣化の程度を診断する三元触媒の劣化診断方法。 - 内燃機関から排出される燃焼排気ガスの排気流路の内部に配設され、前記燃焼排気ガスを浄化する三元触媒の劣化の程度を診断する三元触媒の劣化診断方法であって、
前記排気流路の内部の前記三元触媒より上流側と下流側とに、前記燃焼排気ガスに含まれる前記燃焼排気ガスの空燃比を連続的に測定可能な検出器を配設して、前記排気流路の前記三元触媒より上流側と下流側とにおける前記燃焼排気ガスの空燃比を測定し、下記式(1)に示す相互相関係数Rxy(τ)により、前記三元触媒の劣化の程度を診断する三元触媒の劣化診断方法。
- 前記検出器として、ジルコニア固体電解質方式の検出器を用いる請求項1又は2に記載の三元触媒の劣化診断方法。
- 前記三元触媒の温度が、前記燃焼排気ガスを浄化する浄化反応における活性化温度以上となった状態で、前記三元触媒の劣化の程度を診断する請求項1〜3のいずれかに記載の三元触媒の劣化診断方法。
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JP2004311489A JP4607541B2 (ja) | 2004-10-26 | 2004-10-26 | 三元触媒の劣化診断方法 |
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JP2004311489A JP4607541B2 (ja) | 2004-10-26 | 2004-10-26 | 三元触媒の劣化診断方法 |
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JP2010055541A Division JP5224188B2 (ja) | 2010-03-12 | 2010-03-12 | 排気ガス浄化装置 |
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JP2006125226A JP2006125226A (ja) | 2006-05-18 |
JP4607541B2 true JP4607541B2 (ja) | 2011-01-05 |
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Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5057240B2 (ja) * | 2008-06-19 | 2012-10-24 | トヨタ自動車株式会社 | 内燃機関の触媒劣化診断装置 |
EP2772636B1 (en) | 2011-10-24 | 2016-12-28 | Toyota Jidosha Kabushiki Kaisha | Catalyst-degradation detection device |
JP6502735B2 (ja) * | 2015-04-16 | 2019-04-17 | 安富 祐二 | 非常用発電機用試験機 |
JP7071245B2 (ja) * | 2018-09-07 | 2022-05-18 | 日本碍子株式会社 | 触媒劣化診断方法および触媒劣化診断システム |
JP7071246B2 (ja) * | 2018-09-07 | 2022-05-18 | 日本碍子株式会社 | 触媒劣化診断方法および触媒劣化診断システム |
JP2022094138A (ja) * | 2020-12-14 | 2022-06-24 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0373839A (ja) * | 1989-08-15 | 1991-03-28 | Nissan Motor Co Ltd | 触媒の劣化検出装置 |
JPH03249320A (ja) * | 1990-02-28 | 1991-11-07 | Nippondenso Co Ltd | 触媒の劣化検出装置 |
JPH0726944A (ja) * | 1993-07-06 | 1995-01-27 | Hitachi Ltd | 内燃機関の触媒診断装置 |
JPH0771234A (ja) * | 1993-02-10 | 1995-03-14 | Hitachi Ltd | ガスセンサを用いたエンジン監視システムおよびエンジン放出物低減システム |
JPH0777481A (ja) * | 1993-09-08 | 1995-03-20 | Hitachi Ltd | 内燃機関の故障診断装置 |
JP2003519321A (ja) * | 1999-12-31 | 2003-06-17 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 内燃機関の三元触媒の作動方法 |
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- 2004-10-26 JP JP2004311489A patent/JP4607541B2/ja active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0373839A (ja) * | 1989-08-15 | 1991-03-28 | Nissan Motor Co Ltd | 触媒の劣化検出装置 |
JPH03249320A (ja) * | 1990-02-28 | 1991-11-07 | Nippondenso Co Ltd | 触媒の劣化検出装置 |
JPH0771234A (ja) * | 1993-02-10 | 1995-03-14 | Hitachi Ltd | ガスセンサを用いたエンジン監視システムおよびエンジン放出物低減システム |
JPH0726944A (ja) * | 1993-07-06 | 1995-01-27 | Hitachi Ltd | 内燃機関の触媒診断装置 |
JPH0777481A (ja) * | 1993-09-08 | 1995-03-20 | Hitachi Ltd | 内燃機関の故障診断装置 |
JP2003519321A (ja) * | 1999-12-31 | 2003-06-17 | ロベルト・ボッシュ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | 内燃機関の三元触媒の作動方法 |
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