JP5476677B2 - 排気ガス浄化方法及び排気ガス浄化システム - Google Patents
排気ガス浄化方法及び排気ガス浄化システム Download PDFInfo
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Description
また、上記の排気ガス浄化方法において、前記第1空燃比制御又は前記第2空燃比制御又は前記第3空燃比制御に関する前記指標温度の判定は、前記HC吸着材より上流側に配置された温度センサの検出温度に基づいて行い、かつ、前記第3空燃比制御はリッチ制御であるようにする。
また、上記の排気ガス浄化システムにおいて、前記第1空燃比制御又は前記第2空燃比制御又は前記第3空燃比制御に関する前記指標温度の判定は、前記HC吸着材より上流側に配置された温度センサの検出温度に基づいて行い、かつ、前記第3空燃比制御はリッチ制御であるように構成される。
10 ディーゼルエンジン
11 排気通路
30 排気ガス浄化装置
31 酸化触媒(DOC)
32 NOx吸蔵還元型触媒(LNT)
33 HC吸着材(HCT)
34 触媒付きDPF(CSF)
40 エンジン制御装置(ECU)
40a 排気ガス浄化制御装置
41 空燃比(A/F)センサ
42、43、44、45 温度センサ
46 NOxセンサ
47 還元剤供給装置
Tc 指標温度
Tc1 第1判定温度
Tc2 第2判定温度
Claims (4)
- 内燃機関の排気通路の上流側から順に、排気ガス中のNOxを浄化するNOx吸蔵還元型触媒と、排気ガス中の炭化水素を吸着するHC吸着材と、排気ガス中のPMを浄化する触媒付きDPF又は酸化触媒とを配置した排気ガス浄化装置を使用する排気ガス浄化方法において、
前記NOx吸蔵還元型触媒のNOx吸蔵能力を回復するNOx再生制御の際に、前記HC吸着材の温度を指標する指標温度が第1判定温度以下では、排気ガスの空燃比を空気過剰率換算で0.8〜1.1とする第1空燃比制御を行い、前記NOx再生制御の際に、前記指標温度が前記第1判定温度と第2判定温度との間では常に、前記内燃機関のポスト噴射又は前記排気通路に設けた還元剤供給装置の燃料噴射により前記排気通路に燃料を供給して排気ガスの空燃比を空気過剰率換算で1.0〜1.1とする第2空燃比制御を行い、前記NOx再生制御の際に、前記指標温度が前記第2判定温度より高い場合には、排気ガスの空燃比を空気過剰率換算で0.8〜1.1とする第3空燃比制御を行うことを特徴とする排気ガス浄化方法であって、
前記第2空燃比制御の空燃比は、前記第1空燃比制御の空燃比より酸素量が多いことを特徴とする排気ガス浄化方法。 - 前記第1空燃比制御又は前記第2空燃比制御又は前記第3空燃比制御に関する前記指標温度の判定は、前記HC吸着材より上流側に配置された温度センサの検出温度に基づいて行い、かつ、
前記第3空燃比制御はリッチ制御であることを特徴とする請求項1記載の排気ガス浄化方法。 - 内燃機関の排気通路の上流側から順に、排気ガス中のNOxを浄化するNOx吸蔵還元型触媒と、排気ガス中の炭化水素を吸着するHC吸着材と、排気ガス中のPMを浄化する触媒付きDPF又は酸化触媒とを備えた排気ガス浄化システムにおいて、
前記NOx吸蔵還元型触媒のNOx吸蔵能力を回復するNOx再生制御の際に、前記HC吸着材の温度を指標する指標温度が第1判定温度以下では、排気ガスの空燃比を空気過剰率換算で0.8〜1.1とする第1空燃比制御を行い、前記NOx再生制御の際に、前記指標温度が前記第1判定温度と第2判定温度との間では常に、前記内燃機関のポスト噴射又は前記排気通路に設けた還元剤供給装置の燃料噴射により前記排気通路に燃料を供給して排気ガスの空燃比を空気過剰率換算で1.0〜1.1とする第2空燃比制御を行い、前記NOx再生制御の際に、前記指標温度が前記第2判定温度より高い場合には、排気ガスの空燃比を空気過剰率換算で0.8〜1.1とする第3空燃比制御を行う排気ガス浄化制御装置を備えたことを特徴とする排気ガス浄化システムであって、
前記第2空燃比制御の空燃比は、前記第1空燃比制御の空燃比より酸素量が多いことを特徴とする排気ガス浄化システム。 - 前記第1空燃比制御又は前記第2空燃比制御又は前記第3空燃比制御に関する前記指標温度の判定は、前記HC吸着材より上流側に配置された温度センサの検出温度に基づいて行い、かつ、
前記第3空燃比制御はリッチ制御であることを特徴とする請求項3記載の排気ガス浄化システム。
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US12/736,676 US8671661B2 (en) | 2008-04-30 | 2009-04-15 | Exhaust gas purification method and exhaust gas purification system |
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