JPWO2013179393A1 - 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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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 83
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 description 1
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
車両に搭載される内燃機関の排気通路に配置されたNOx触媒と、
前記NOx触媒へ流入する排気の温度を上昇させることにより、前記NOx触媒を昇温させる処理である昇温処理を実行する昇温手段と、
前記NOx触媒の温度を検出する検出手段と、
前記NOx触媒の温度が前記検出手段により検出された温度から所定量上昇したと仮定した場合の前記所定量に対するNOx浄化率の上昇量の割合である温度変化率が基準値以上になることを条件として、前記昇温処理の実行を許可する制御手段と、
を備えるようにした。
先ず、本発明の第1の実施例について図1乃至図5に基づいて説明する。図1は、本発明が適用される内燃機関の概略構成を示す図である。
Enox=(Anoxin−Anoxout)/Anoxin
上記の式中のEnoxは、NOX浄化率である。Anoxinは、選択還元型触媒へ流入するNOXの量(NOX流入量)である。Anoxoutは、選択還元型触媒から流出するNOXの量(NOX流出量)である。
次に、本発明の第2の実施例について図6及び図7に基づいて説明する。ここでは、前述した第1の実施例と異なる構成について説明し、同様の構成については説明を省略する。
2 吸気通路
3 排気通路
4 スロットル弁
5 第1触媒ケーシング
6 第2触媒ケーシング
7 還元剤添加弁
8 第1排気温度センサ
9 第2排気温度センサ
10 ECU
11 クランクポジションセンサ
12 アクセルポジションセンサ
13 エアフローメータ
14 A/Fセンサ1
70 ポンプ
71 還元剤タンク
Claims (6)
- 車両に搭載された内燃機関の排気通路に配置されるNOX触媒と、
前記NOX触媒へ流入する排気の温度を上昇させることにより、前記NOX触媒を昇温させる処理である昇温処理を実行する昇温手段と、
前記NOX触媒の温度を検出する検出手段と、
前記NOX触媒の温度が前記検出手段により検出された温度から所定量上昇したと仮定した場合の前記所定量に対するNOX浄化率の上昇量の割合である温度変化率が基準値以上になることを条件として、前記昇温処理の実行を許可する制御手段と、
を備える内燃機関の排気浄化装置。 - 請求項1において、前記NOX触媒より上流の排気通路に配置される酸化触媒をさらに備え、
前記昇温処理は、前記酸化触媒へ未燃燃料を供給する処理であり、
前記制御手段は、前記酸化触媒の温度が所定の活性温度以上であり、且つ前記温度変化率が前記基準値以上であることを条件として、前記昇温処理の実行を許可する内燃機関の排気浄化装置。 - 請求項2において、前記酸化触媒から流出する排気に含まれるエミッションの量を積算する演算手段をさらに備え、
前記制御手段は、前記演算手段により算出されたエミッションの積算量が比較値を超えているときは、前記昇温処理の実行を禁止する内燃機関の排気浄化装置。 - 請求項2又は3において、前記制御手段は、前記昇温処理の実行中に前記NOX触媒のNOX浄化率が一定値を超えると、前記酸化触媒へ供給される未燃燃料の量を減少させる内燃機関の排気浄化装置。
- 請求項1乃至4のいずれか1項において、前記制御手段は、前記検出手段により検出された温度が所定の温度範囲に属するときに、前記温度変化率が前記基準値以上であると判定する内燃機関の排気浄化装置。
- 請求項1乃至4のいずれか一項において、前記制御手段は、前記NOX触媒のNOX浄化率が所定の浄化率範囲に属するときに、前記温度変化率が前記基準値以上であると判定する内燃機関の排気浄化装置。
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FR3063521B1 (fr) * | 2017-03-06 | 2019-08-16 | Peugeot Citroen Automobiles Sa | Procede de controle d’emission d’un polluant pendant un mode de fonctionnement d’un moteur thermique le protegeant de fortes temperatures |
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JP2003269146A (ja) * | 2002-03-19 | 2003-09-25 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP2004036543A (ja) * | 2002-07-04 | 2004-02-05 | Mitsubishi Fuso Truck & Bus Corp | 内燃機関の排気浄化装置 |
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JP2001164928A (ja) | 1999-12-13 | 2001-06-19 | Mazda Motor Corp | エンジンの排気浄化装置及び浄化方法 |
JP4253984B2 (ja) | 2000-02-14 | 2009-04-15 | マツダ株式会社 | ディーゼルエンジンの制御装置 |
JP4677837B2 (ja) | 2005-07-08 | 2011-04-27 | いすゞ自動車株式会社 | 排気ガス浄化システムの再生制御方法及び排気ガス浄化システム |
JP4702310B2 (ja) | 2007-03-19 | 2011-06-15 | トヨタ自動車株式会社 | 圧縮着火式内燃機関の排気浄化装置 |
JP5326502B2 (ja) | 2008-11-04 | 2013-10-30 | 日産自動車株式会社 | 内燃機関の排気浄化装置 |
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EP2857648A1 (en) | 2015-04-08 |
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