EXHAUST EMISSION CONTROL DEVICE

PROBLEM TO BE SOLVED: To obtain security countermeasures at a low cost in an exhaust emission control device using a plurality of post-treatment devices which need the addition of fuel.SOLUTION: In an exhaust emission control device which comprises a particulate filter 1 and a selective reduction type catalyst 2 as a plurality of post-treatment devices which need the addition of fuel in the middle of an exhaust pipe 3, and in which a fuel supply path 7 is laid from a fuel feed pump 8 toward the filter and the catalyst, and the fuel is independently added to the particulate filter 1 and the selective reduction type catalyst 2 by diverting a part of engine drive fuel from the fuel feed pump 8 by the fuel supply path 7, the fuel supply path 7 is branched at its middle, connected to fuel addition valves 5, 6 at inlet sides of the particulate filter 1 and the selective reduction type catalyst 2, and a fuel cut valve 11 is arranged an upstream side rather than a branch point A of the fuel supply path 7.SELECTED DRAWING: Figure 1 【課題】燃料添加を要する複数の後処理装置を用いた排気浄化装置における保安対策を低コストで実現する。【解決手段】排気管３途中に燃料添加を要する複数の後処理装置としてパティキュレートフィルタ１と選択還元型触媒２を備え、これらに向けフューエルフィードポンプ８から燃料供給経路７を配索し、該燃料供給経路７により前記フューエルフィードポンプ８からエンジン駆動用燃料の一部を流用してパティキュレートフィルタ１と選択還元型触媒２に個別に燃料添加を行うようにした排気浄化装置に関し、前記燃料供給経路７を途中で分岐してパティキュレートフィルタ１と選択還元型触媒２の夫々の入側の燃料添加弁５，６に夫々接続すると共に、前記燃料供給経路７の分岐箇所Ａより上流側にフューエルカットバルブ１１を装備する。【選択図】図１