JP4428445B2 - 内燃機関の排気浄化装置 - Google Patents
内燃機関の排気浄化装置 Download PDFInfo
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- 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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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- B01D53/9413—Processes characterised by a specific catalyst
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Description
本発明は、廉価でかつ確実に尿素水の濃度を推定することのできる排気浄化装置を提供することにある。
図1を参照すると、1は機関本体、2は各気筒の燃焼室、3は各燃焼室2内に夫々燃料を噴射するための電子制御式燃料噴射弁、4は吸気マニホルド、5は排気マニホルドを夫々示す。吸気マニホルド4は吸気ダクト6を介して排気ターボチャージャ7のコンプレッサ7aの出口に連結され、コンプレッサ7aの入口は吸入空気量検出器8を介してエアクリーナ9に連結される。吸気ダクト6内にはステップモータにより駆動されるスロットル弁10が配置され、更に吸気ダクト6周りには吸気ダクト6内を流れる吸入空気を冷却するための冷却装置11が配置される。図1に示される実施例では機関冷却水が冷却装置11内に導かれ、機関冷却水によって吸入空気が冷却される。
まず初めに検出NOx浄化率の低下率RAについて説明すると、NOxセンサ41内に内蔵されているNOxセンサ加熱用のヒータの通電時間が長くなるほどNOxセンサ41は劣化し、従ってNOxセンサ加熱用のヒータの通電時間の積算値が大きくなるほど検出NOx浄化率は低下する。このヒータ通電時間の積算値と検出NOx浄化率の低下率RAとの関係は図14(A)に示されるように予め実験により求められており、従って第1の例では検出NOx浄化率の低下率RAは図14(A)に示す関係から求められる。
図20を参照するとまず初めにステップ110においてこれまで説明したいずれかの検出NOx浄化率の低下率RAが算出され、次いでステップ111においてこれまで説明したいずれかの検出NOx浄化率の低下率RBが算出される。次いでステップ112においてこれまで説明したいずれかの検出NOx浄化率の低下率RCが算出される。
5 排気マニホルド
12,16 酸化触媒
13 パティキュレートフィルタ
15 NOx選択還元触媒
17 尿素水供給弁
20 尿素水タンク
40 レベルセンサ
41 NOxセンサ
Claims (9)
- 機関排気通路内にNOx選択還元触媒を配置し、尿素水タンク内に貯留された尿素水を該NOx選択還元触媒に供給して該尿素水から発生するアンモニアにより排気ガス中に含まれるNOxを選択的に還元するようにし、該NOx選択還元触媒によるNOx浄化率を検出するためにNOx選択還元触媒下流の機関排気通路内にNOxセンサを配置し、検出された該NOx浄化率から尿素水タンク内の尿素水の濃度を推定すると共に、検出されたNOx浄化率が低下したときには尿素水タンク内の尿素水の濃度が異常に低下した異常状態であると推定するようにした内燃機関の排気浄化装置において、尿素水タンク内の液面の高さを検出するためのレベルセンサを具備しており、該レベルセンサによって尿素水タンク内に補充液が補充されたか否かが判別され、尿素水タンク内に補充液が補充されたと判断されたときに補充液の補充後に検出されたNO x 浄化率が予め定められた許容レベル以下になった場合に、検出された該NO x 浄化率から尿素水タンク内の尿素水の濃度を推定するようにした内燃機関の排気浄化装置。
- 上記補充液の補充後に検出されたNO x 浄化率が予め定められた許容レベル以下に低下したときには尿素水タンク内の尿素水の濃度が異常に低下した異常状態であると推定するようにした請求項1に記載の内燃機関の排気浄化装置。
- 上記補充液をアンモニア濃度が零の液体であると仮定したときに想定される補充後の尿素水タンク内の尿素水の想定濃度が算出され、尿素水タンク内に補充液が補充されたと判断されたときに補充液の補充後に検出されたNO x 浄化率が予め定められた許容レベル以下になりかつ上記尿素水の想定濃度が予め定められた許容濃度以下になったときには尿素水タンク内の尿素水の濃度が異常に低下した異常状態であると推定するようにした請求項1に記載の内燃機関の排気浄化装置。
- NO x センサにより検出された検出NO x 浄化率からNO x センサの劣化により生ずる検出NO x 浄化率の低下分を含まない尿素水濃度推定用NO x 浄化率を求め、該尿素水濃度推定用NO x 浄化率から尿素水タンク内の尿素水の濃度を推定するようにした請求項1に記載の内燃機関の排気浄化装置。
- NO x センサの劣化に起因する検出NO x 浄化率の低下率を求め、NO x センサにより検出された検出NO x 浄化率と該NO x 浄化率の低下率からNO x センサが劣化していないときの上記尿素水濃度推定用NO x 浄化率を求めるようにした請求項4に記載の内燃機関の排気浄化装置。
- NO x センサにより検出された検出NO x 浄化率からNO x 選択還元触媒の劣化により生ずるNO x 浄化率の低下分を含まない尿素水濃度推定用NO x 浄化率を求め、該尿素水濃度推定用NO x 浄化率から尿素水タンク内の尿素水の濃度を推定するようにした請求項1に記載の内燃機関の排気浄化装置。
- NO x 選択還元触媒の劣化に起因するNO x 浄化率の低下率を求め、NO x センサにより検出された検出NO x 浄化率と該NO x 浄化率の低下率からNO x 選択還元触媒が劣化していないときの上記尿素水濃度推定用NO x 浄化率を求めるようにした請求項6に記載の内燃機関の排気浄化装置。
- NO x センサにより検出された検出NO x 浄化率から尿素水供給弁の不具合により生ずるNO x 浄化率の低下分を含まない尿素水濃度推定用NO x 浄化率を求め、該尿素水濃度推定用NO x 浄化率から尿素水タンク内の尿素水の濃度を推定するようにした請求項1に記載の内燃機関の排気浄化装置。
- 尿素水供給弁の不具合に起因するNO x 浄化率の低下率を求め、NO x センサにより検出された検出NO x 浄化率と該NO x 浄化率の低下率から尿素水供給弁が正常であるときの上記尿素水濃度推定用NO x 浄化率を求めるようにした請求項8に記載の内燃機関の排気浄化装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007335191A JP4428445B2 (ja) | 2007-09-05 | 2007-12-26 | 内燃機関の排気浄化装置 |
US12/675,947 US20100205940A1 (en) | 2007-09-05 | 2008-09-03 | Exhaust emission control system of internal combustion engine and exhaust emission control method |
KR1020107000826A KR101136767B1 (ko) | 2007-09-05 | 2008-09-03 | 내연기관의 배기 배출 제어 시스템 및 배기 배출 제어 방법 |
PCT/IB2008/002640 WO2009031030A2 (en) | 2007-09-05 | 2008-09-03 | Exhaust emission control system of internal combustion engine and exhaust emission control method |
CN2008801056365A CN102317587A (zh) | 2007-09-05 | 2008-09-03 | 内燃机的排气排放控制***及排气排放控制方法 |
EP08829189A EP2191110A2 (en) | 2007-09-05 | 2008-09-03 | Exhaust emission control system of internal combustion engine and exhaust emission control method |
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JP2007335191A JP4428445B2 (ja) | 2007-09-05 | 2007-12-26 | 内燃機関の排気浄化装置 |
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US (1) | US20100205940A1 (ja) |
EP (1) | EP2191110A2 (ja) |
JP (1) | JP4428445B2 (ja) |
KR (1) | KR101136767B1 (ja) |
CN (1) | CN102317587A (ja) |
WO (1) | WO2009031030A2 (ja) |
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-
2007
- 2007-12-26 JP JP2007335191A patent/JP4428445B2/ja not_active Expired - Fee Related
-
2008
- 2008-09-03 CN CN2008801056365A patent/CN102317587A/zh active Pending
- 2008-09-03 EP EP08829189A patent/EP2191110A2/en not_active Withdrawn
- 2008-09-03 WO PCT/IB2008/002640 patent/WO2009031030A2/en active Application Filing
- 2008-09-03 US US12/675,947 patent/US20100205940A1/en not_active Abandoned
- 2008-09-03 KR KR1020107000826A patent/KR101136767B1/ko not_active IP Right Cessation
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EP2191110A2 (en) | 2010-06-02 |
KR101136767B1 (ko) | 2012-04-24 |
WO2009031030A8 (en) | 2009-12-17 |
CN102317587A (zh) | 2012-01-11 |
KR20100022108A (ko) | 2010-02-26 |
JP2009079584A (ja) | 2009-04-16 |
WO2009031030A2 (en) | 2009-03-12 |
WO2009031030A3 (en) | 2009-07-02 |
WO2009031030A9 (en) | 2011-11-10 |
US20100205940A1 (en) | 2010-08-19 |
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