Exhaust emission control device

排気浄化装置

Abstract

【課題】必要最小限の燃料の添加により効率良くNOx吸蔵還元触媒を再生し得るようにする。 【解決手段】排気管9の途中にNOx吸蔵還元触媒10を装備し且つ該NOx吸蔵還元触媒10の上流側に還元剤として燃料を添加してNOxを還元浄化するように構成した排気浄化装置に関し、前記排気管9におけるNOx吸蔵還元触媒10より上流側に排気流量を適宜に絞り込む排気絞り手段としてバタフライ弁11を備えると共に、該バタフライ弁11の直後に排気管9内に燃料を添加するインジェクタ14を燃料添加手段として設け、前記を車両の減速時に絞り込んで前記インジェクタ14に燃料添加を実行せしめる制御装置16を備える。 【選択図】図1
<P>PROBLEM TO BE SOLVED: To efficiently regenerate NOx storage reduction catalyst by adding the necessary minimum fuel. <P>SOLUTION: In this exhaust emission control device, the NOx storage reduction catalyst 10 is provided in the midway of an exhaust pipe 9, and fuel is added as a reducing agent to the upstream side of the NOx storage reduction catalyst 10. The device includes: a butterfly valve 11 as an exhaust emission throttle means for suitably throttling the exhaust flow rate on the upstream side from the NOx storage reduction catalyst 10 in the exhaust pipe 9; an injector 14 provided as a fuel adding means for adding fuel into the exhaust pipe 9 immediately after the butterfly valve 11; and a control device 16 for throttling the above in decelerating a vehicle to perform addition of fuel to the injector 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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Cited By (3)

    Publication numberPublication dateAssigneeTitle
    JP-2006233906-ASeptember 07, 2006Toyota Motor Corp, トヨタ自動車株式会社Exhaust emission control device for internal combustion engine
    JP-2009156065-AJuly 16, 2009Mitsubishi Motors Corp, 三菱自動車工業株式会社内燃機関の排気ガス浄化装置
    JP-2009203961-ASeptember 10, 2009Hino Motors Ltd, 日野自動車株式会社Exhaust emission control device