JP2006144624A - 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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- F01N3/36—Arrangements for supply of additional fuel
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- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9481—Catalyst preceded by an adsorption device without catalytic function for temporary storage of contaminants, e.g. during cold start
- B01D53/949—Catalyst preceded by an adsorption device without catalytic function for temporary storage of contaminants, e.g. during cold start for storing sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- F01N2560/027—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting SOx
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Abstract
【解決手段】 排気通路に設けられた吸蔵還元型NOx触媒と、NOx触媒の上流側に設けられたSOx吸収剤と、SOx吸収剤の上流側に設けられた還元剤供給手段と、SOx吸収剤のSトラップ率を検出するSトラップ率検出手段とを具備し、Sトラップ率が所定の値よりも小さい場合には還元剤供給手段による還元剤の供給前後におけるSOx吸収剤の温度変化量(ΔTa)がNOx触媒の温度変化量(ΔTb)よりも小さくなるように、かつ還元剤の供給後におけるSOx吸収剤の温度(Ta2)がSトラップ率向上温度(Ti)よりも高くてS成分脱離温度(Tr)よりも低くなるように、還元剤供給手段により還元剤を供給し、それにより、NOx触媒を高温にすると共に空燃比をリッチにすることによって、NOx触媒に吸蔵されたSOxを放出させるようにした内燃機関の排気浄化装置が提供される。
【選択図】 図8
Description
すなわち2番目の発明においては、還元剤供給手段から供給されてSOx吸収剤に到達した重質燃料は反応するのに比較的長時間を要するので、上流側のSOx吸収剤の温度をS成分脱離温度以下に抑えることが可能となる。なお、重質燃料および軽質燃料は内燃機関で使用される通常燃料とは別個に備えられていてもよく、また通常燃料から分留することにより重質燃料および軽質燃料を形成するようにしてもよい。
すなわち3番目の発明においては、還元剤供給手段から供給されてSOx吸収剤に到達した軽質燃料は発熱するのに比較的短時間で済むので、上流側のSOx吸収剤の温度をSトラップ率向上温度以上に比較的容易に高めることが可能となる。
すなわち4番目の発明においては、重質燃料を還元剤噴射ノズルから供給すると共に、重質燃料よりも軽質の燃料をポスト噴射により供給することによって、重質燃料とこれより軽質の軽質燃料との供給割合を容易に変更することができる。
すなわち5番目の発明においては、比較的簡易な構成によってNOx触媒からのSOxの放出を達成することができる。
さらに、2番目の発明によれば、上流側のSOx吸収剤の温度をS成分脱離温度以下に抑えることが可能となるという効果を奏しうる。
さらに、3番目の発明によれば、上流側のSOx吸収剤の温度をSトラップ率向上温度以上に比較的容易に高めることが可能となるという効果を奏しうる。
さらに、4番目の発明によれば、重質燃料とこれより軽質の軽質燃料との供給割合を容易に変更することができるという効果を奏しうる。
さらに、5番目の発明によれば、比較的簡易な構成によってNOx触媒からのSOxの放出を達成することができるという効果を奏しうる。
図1を参照すると、機関本体1は例えば四つの気筒を具備する。各気筒は対応する吸気枝管2を介してサージタンク3に接続され、サージタンク3は吸気ダクト4を介してエアクリーナ5に接続される。吸気ダクト4内にはスロットル弁6が配置される。また、各気筒には燃焼室内に燃料を直接噴射する燃料噴射弁7が取り付けられる。一方、各気筒は共通の排気マニホルド8を介してケーシング10に連結されている。ケーシング10内においてはSOx吸収剤9と吸蔵還元型NOx触媒(以下、「NOx触媒」と称する)12とが配置されている。図示されるように、SOx吸収剤9はNOx触媒12の上流側に配置されている。
TAU(i)=TP・(1+K(i))
ここでTPは基本燃料噴射時間、K(i)はi番気筒の補正係数をそれぞれ表している。
7 燃料噴射弁
9 SOx吸収剤(Sトラップ剤)
10 ケーシング
11 排気管
12 吸蔵還元型NOx触媒
20 電子制御ユニット
55、56 温度センサ
60 還元剤供給ノズル(還元剤供給手段)
Ta1、Ta2 SOx吸収剤の温度
Tb1、Tb2 NOx触媒の温度
Ti Sトラップ率向上温度
Tr S成分脱離温度
ΔTa SOx吸収剤の温度変化量
ΔTb NOx触媒の温度変化量
Claims (5)
- 内燃機関の排気通路に設けられた吸蔵還元型NOx触媒と、
該NOx触媒の上流側に設けられていてS成分を吸収してトラップするSOx吸収剤と、
該SOx吸収剤の上流側において還元剤を供給する還元剤供給手段と、
前記SOx吸収剤のSトラップ率を検出するSトラップ率検出手段とを具備し、
前記Sトラップ率検出手段により検出されたSトラップ率が所定の値よりも小さい場合には、前記還元剤供給手段による前記還元剤の供給前後における前記SOx吸収剤の温度変化量が前記還元剤の供給前後における前記NOx触媒の温度変化量よりも小さくなるように、かつ、前記還元剤の供給後における前記SOx吸収剤の温度が前記SOx吸収剤のSトラップ率を向上させられるSトラップ率向上温度よりも高くてS成分が前記SOx吸収剤から脱離するS成分脱離温度よりも低くなるように、前記還元剤供給手段により還元剤を供給し、それにより、前記NOx触媒を高温にすると共に空燃比をリッチにすることによって、前記NOx触媒に吸蔵されたSOxを放出させるようにした内燃機関の排気浄化装置。 - 前記還元剤供給手段は重質燃料および軽質燃料を供給するようになっており、該還元剤供給手段は前記重質燃料および前記軽質燃料の供給割合を変更可能であり、
前記NOx触媒からSOxを放出させる際には、前記重質燃料の供給割合を増すことによって前記SOx吸収剤の温度を前記S成分脱離温度よりも低く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。 - 前記還元剤供給手段は重質燃料および軽質燃料を供給するようになっており、該還元剤供給手段は前記重質燃料および前記軽質燃料の供給割合を変更可能であり、
前記NOx触媒からSOxを放出させる際には、前記軽質燃料の供給割合を増すことによって前記SOx吸収剤の温度を前記Sトラップ率向上温度よりも高くするようにした請求項1または2に記載の内燃機関の排気浄化装置。 - 前記還元剤供給手段はポスト噴射による還元剤供給と前記排気通路に設けられた還元剤噴射ノズルからの還元剤供給とを行うようになっており、前記還元剤噴射ノズルから供給される燃料がポスト噴射の燃料よりも重質である重質燃料であるようにした請求項3に記載の内燃機関の排気浄化装置。
- 前記還元剤供給手段は前記排気通路に設けられた還元剤噴射ノズルであり、前記NOx触媒からSOxを放出させる際には、前記還元剤噴射ノズルによる一回の噴射当たりの燃料噴射量を増大させること、および前記還元剤噴射ノズルによる噴射間隔を短くすることのうちの少なくとも一方が行われる請求項1に記載の内燃機関の排気浄化装置。
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JP2004334366A JP4241583B2 (ja) | 2004-11-18 | 2004-11-18 | 内燃機関の排気浄化装置 |
EP05025179A EP1659270B1 (en) | 2004-11-18 | 2005-11-17 | Exhaust purification system for internal combustion engine |
DE602005002113T DE602005002113T2 (de) | 2004-11-18 | 2005-11-17 | Abgasreinigungssystem für eine Brennkraftmaschine |
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Cited By (5)
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WO2008123629A1 (ja) * | 2007-04-05 | 2008-10-16 | Toyota Jidosha Kabushiki Kaisha | 内燃機関の排気浄化装置 |
WO2008133180A1 (ja) | 2007-04-20 | 2008-11-06 | Toyota Jidosha Kabushiki Kaisha | 硫黄吸蔵触媒 |
WO2008143062A1 (ja) | 2007-05-18 | 2008-11-27 | Toyota Jidosha Kabushiki Kaisha | S吸蔵触媒及び排ガス浄化装置 |
JP2009079523A (ja) * | 2007-09-26 | 2009-04-16 | Honda Motor Co Ltd | 内燃機関の排気浄化装置 |
WO2009125865A1 (ja) * | 2008-04-11 | 2009-10-15 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
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BRPI0706058B8 (pt) * | 2006-07-04 | 2022-07-12 | Toyota Motor Co Ltd | Dispositivo de purificação de descarga e método de purificação de descarga de motor de combustão interna |
WO2011055456A1 (ja) * | 2009-11-09 | 2011-05-12 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
DE102012017312A1 (de) * | 2012-09-03 | 2014-03-06 | Man Diesel & Turbo Se | Brennkraftmaschine |
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JP2605559B2 (ja) * | 1992-12-03 | 1997-04-30 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP3374784B2 (ja) * | 1999-05-26 | 2003-02-10 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
US7025875B2 (en) * | 2001-05-14 | 2006-04-11 | Delphi Technologies, Inc. | Diesel fuel reforming strategy |
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Cited By (12)
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WO2008123629A1 (ja) * | 2007-04-05 | 2008-10-16 | Toyota Jidosha Kabushiki Kaisha | 内燃機関の排気浄化装置 |
JP2008255891A (ja) * | 2007-04-05 | 2008-10-23 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP4605174B2 (ja) * | 2007-04-05 | 2011-01-05 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
US8132401B2 (en) | 2007-04-05 | 2012-03-13 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification device of internal combustion engine |
WO2008133180A1 (ja) | 2007-04-20 | 2008-11-06 | Toyota Jidosha Kabushiki Kaisha | 硫黄吸蔵触媒 |
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JP2009079523A (ja) * | 2007-09-26 | 2009-04-16 | Honda Motor Co Ltd | 内燃機関の排気浄化装置 |
WO2009125865A1 (ja) * | 2008-04-11 | 2009-10-15 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
US8640442B2 (en) | 2008-04-11 | 2014-02-04 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification device of internal combustion engine |
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EP1659270B1 (en) | 2007-08-22 |
DE602005002113T2 (de) | 2008-05-21 |
JP4241583B2 (ja) | 2009-03-18 |
DE602005002113D1 (de) | 2007-10-04 |
EP1659270A1 (en) | 2006-05-24 |
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