JP2008286102A - NOx浄化システムの制御方法及びNOx浄化システム - Google Patents
NOx浄化システムの制御方法及びNOx浄化システム Download PDFInfo
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- JP2008286102A JP2008286102A JP2007131675A JP2007131675A JP2008286102A JP 2008286102 A JP2008286102 A JP 2008286102A JP 2007131675 A JP2007131675 A JP 2007131675A JP 2007131675 A JP2007131675 A JP 2007131675A JP 2008286102 A JP2008286102 A JP 2008286102A
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Abstract
【解決手段】アンモニア生成制御に際して、選択還元型触媒33で吸着するアンモニアの目標値であるアンモニア吸着目標量Atを算出し、アンモニア生成制御により第1触媒32で生成されるアンモニア生成量A4の積算値A3がアンモニア吸着目標量Atを下回る時にのみアンモニア生成制御を実施する。
【選択図】図3
Description
10 ディーゼルエンジン
11 排気ガス通路
30 NOx浄化装置
31 酸化触媒(DOC)
32 リーンNOx触媒(LNT)
33 選択還元型触媒(SCR触媒)
40 エンジン制御装置(ECU)
40a NOx浄化制御装置
41 空燃比(A/F)センサ
42、43、44、45 温度センサ
A 空気
A1 アンモニア吸着量
A2 アンモニア消費量
A3 アンモニア生成蓄積量
A4 アンモニア生成量
As アンモニア生成開始量
At アンモニア吸着目標量
Au アンモニア吸着上限量
C10 NOx浄化制御手段
C11 通常運転制御手段
C12 アンモニア生成開始判断手段
C13 アンモニア生成制御手段
C13a 第1触媒昇温制御手段
C13b 排気ガス空燃比制御手段
C14 アンモニア生成停止判断手段
G 排気ガス
N1 NOx流出量
Ne エンジン回転数
Q 燃料噴射量(又は負荷)
Tlnt リーンNOx触媒の触媒温度
Tscr 選択還元型触媒の触媒温度
λ 空気過剰率
Claims (14)
- 排気ガス通路に上流側からリーンNOx触媒又は三元触媒で形成される第1触媒と選択還元型NOx触媒を配置し、アンモニア生成制御を実施した時に前記第1触媒でアンモニアを生成させ、発生したアンモニアを前記選択還元型触媒に吸着させると共に、前記アンモニア生成制御を実施しない時では前記選択還元型触媒に吸着させたアンモニアで排気ガス中のNOxを還元するNOx浄化システムの制御方法において、
前記アンモニア生成制御に際して、前記選択還元型触媒で吸着するアンモニアの目標値であるアンモニア吸着目標量を算出し、前記アンモニア生成制御により前記第1触媒で生成されるアンモニア生成量の積算値が前記アンモニア吸着目標量を下回る時にのみ前記アンモニア生成制御を実施することを特徴とするNOx浄化システムの制御方法。 - 前記アンモニア生成制御を実施しない時において、前記選択還元型触媒に吸着されているアンモニア吸着量を算出し、該アンモニア吸着量が所定のアンモニア生成開始量以下となった時に前記アンモニア生成制御を開始することを特徴とする請求項1記載のNOx浄化システムの制御方法。
- 前記アンモニア吸着目標量を、前記選択還元型触媒に吸着可能なアンモニア吸着上限量と、前記アンモニア生成制御開始時の前記選択還元型触媒に吸着されているアンモニア吸着量とから算出することを特徴とする請求項1又は2記載のNOx浄化システムの制御方法。
- 前記アンモニア吸着目標量の算出に際して、前記第1触媒から流出するNOxの流出量のマップデータ、前選択還元型触媒に吸着可能なアンモニア吸着上限量のマップデータの少なくとも一方を使用することを特徴とする請求項1、2又は3記載のNOx浄化システムの制御方法。
- 前記アンモニア生成制御において、前記第1触媒の温度が所定の温度以上の時と、触媒温度上昇制御により前記第1触媒の温度が前記所定の温度以上になった時にのみ、排気ガスの空燃比を深いリッチ状態にする排気ガス空燃比制御を行うことを特徴とする請求項1、2、3又は4記載のNOx浄化システムの制御方法。
- 前記アンモニア生成制御に際して、前記第1触媒の温度と排気ガスの空燃比とをパラメータとするアンモニア生成量のマップデータに従って排気ガスの空燃比を制御することを特徴とする請求項1、2、3、4又は5記載のNOx浄化システムの制御方法。
- 前記アンモニア生成制御において、排気管内燃料噴射を実施し、触媒温度上昇、又は、アンモニア生成、又は、その両方を行うことを特徴とする請求項1、2、3、4、5又は6記載のNOx浄化システムの制御方法。
- 排気ガス通路に上流側からリーンNOx触媒又は三元触媒で形成される第1触媒と選択還元型NOx触媒を配置し、アンモニア生成制御を実施した時に前記第1触媒でアンモニアを生成させ、発生したアンモニアを前記選択還元型触媒に吸着させると共に、前記アンモニア生成制御を実施しない時では前記選択還元型触媒に吸着させたアンモニアで排気ガス中のNOxを還元するNOx浄化システムにおいて、
前記アンモニア生成制御に際して、前記選択還元型触媒で吸着するアンモニアの目標値であるアンモニア吸着目標量を算出し、前記アンモニア生成制御により前記第1触媒で生成されるアンモニア生成量の積算値が前記アンモニア吸着目標量を下回る時にのみ前記アンモニア生成制御を実施するNOx浄化制御装置手段を備えたことを特徴とするNOx浄化システム。 - 前記NOx浄化制御手段が、前記アンモニア生成制御を実施しない時において、前記選択還元型触媒に吸着されているアンモニア吸着量を算出し、該アンモニア吸着量が所定のアンモニア生成開始量以下となった時に前記アンモニア生成制御の開始であるとするアンモニア生成開始判断手段を有することを特徴とする請求項8記載のNOx浄化システム。
- 前記NOx浄化制御手段が、前記アンモニア吸着目標量を、前記選択還元型触媒に吸着可能なアンモニア吸着上限量と、前記アンモニア生成制御開始時の前記選択還元型触媒に吸着されているアンモニア吸着量とから算出することを特徴とする請求項8又は9記載のNOx浄化システム。
- 前記NOx浄化制御手段が、前記アンモニア吸着目標量の算出に際して、前記第1触媒から流出するNOxの流出量のマップデータ、前選択還元型触媒に吸着可能なアンモニア吸着上限量のマップデータの少なくとも一方を使用することを特徴とする請求項8、9又は10記載のNOx浄化システム。
- 前記NOx浄化制御手段が、前記アンモニア生成制御において、前記第1触媒の温度が所定の温度以上の時と、触媒温度上昇制御により前記第1触媒の温度が前記所定の温度以上になった時にのみ、排気ガスの空燃比を深いリッチ状態にする排気ガス空燃比制御を行うことを特徴とする請求項8、9、10又は11記載のNOx浄化システム。
- 前記NOx浄化制御手段が、前記アンモニア生成制御に際して、前記第1触媒の温度と排気ガスの空燃比とをパラメータとするアンモニア生成量のマップデータに従って排気ガスの空燃比を制御することを特徴とする請求項8、9、10、11又は12記載のNOx浄化システム。
- 前記NOx浄化制御手段が、前記アンモニア生成制御において、排気管内燃料噴射を実施し、触媒温度上昇、又は、アンモニア生成、又は、その両方を行うことを特徴とする請求項8、9、10、11、12又は13記載のNOx浄化システム。
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JP4304539B2 (ja) | 2009-07-29 |
EP2149684B1 (en) | 2016-07-27 |
AU2008252224A1 (en) | 2008-11-27 |
AU2008252224A8 (en) | 2009-11-26 |
EP2149684A4 (en) | 2014-02-26 |
EP2149684A1 (en) | 2010-02-03 |
CN101680329A (zh) | 2010-03-24 |
CN101680329B (zh) | 2012-02-29 |
US20100115926A1 (en) | 2010-05-13 |
WO2008142930A1 (ja) | 2008-11-27 |
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US8356470B2 (en) | 2013-01-22 |
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