JP2015068268A - 排気ガス浄化システム及び排気ガス浄化方法 - Google Patents
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- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
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- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/36—Arrangements for supply of additional fuel
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- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
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- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
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- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
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- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
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Abstract
Description
15 排気通路
30 排気ガス浄化システム
31 排気ガス浄化装置
31a NOx吸蔵還元型触媒装置
32 燃料噴射装置
40 全体システム制御装置
41 制御装置
G 排気ガス
M1 リッチ間隔時間マップ
M2 リッチ継続時間マップ
R(=V/Vc) 吸蔵比
T 触媒温度
Tc 下限触媒温度
te リッチ状態を続ける継続時間
te3 第3タイミング
te4 第4タイミング
tec 設定継続時間(リッチ終了時間閾値)
ti1 第1タイミング
ti2 第2タイミング
tic 設定間隔時間(リッチ開始時間閾値)
V NOx吸蔵量の推定値
Vc リッチ開始閾値
Ve リッチ終了閾値
α リッチ間隔補正係数
β 継続時間補正係数
Claims (6)
- 内燃機関の排気通路に空燃比リッチ制御により触媒の浄化能力を回復する触媒装置と、前記空燃比リッチ制御を行う制御装置を備えた排気ガス浄化システムにおいて、
前記制御装置が、
触媒温度が予め設定した下限触媒温度以下では前記空燃比リッチ制御を禁止すると共に、
NOx吸蔵量の推定値が予め設定されたリッチ開始閾値に達した第1タイミングと、リッチ間隔時間マップで設定された設定間隔時間に基づく第2タイミングとの両方を満たした場合に前記空燃比リッチ制御を開始し、
前記触媒装置の触媒温度と、NOx吸蔵量の推定値のリッチ開始閾値に対する吸蔵比をベースにリッチ間隔補正係数を予め設定し、該リッチ間隔補正係数を前記設定間隔時間に乗じて前記第2タイミングを補正するように構成されたことを特徴とする排気ガス浄化システム。 - 前記制御装置が、
前記空燃比リッチ制御の開始後のリッチ状態を続ける継続時間が、NOx還元量の推定値がリッチ終了閾値に達した第3タイミングと、リッチ継続時間マップで規定されている設定継続時間を経過した第4タイミングとの両方を満たした場合に前記空燃比リッチ制御を終了すると共に、
触媒温度に対応して設定された継続時間補正係数を前記設定継続時間に乗じて前記第4タイミングを補正するように構成されたことを特徴とする請求項1記載の排気ガス浄化システム。 - 前記制御装置が、
前記リッチ間隔補正係数を、触媒温度が低いほど大きく、前記吸蔵比が小さいほど大きく設定し、前記継続時間補正係数を、触媒温度が低いほど大きく設定するように構成されたことを特徴とする請求項2記載の排気ガス浄化システム。 - 内燃機関の排気通路に備えた触媒装置の触媒の浄化能力を空燃比リッチ制御により回復する排気ガス浄化方法において、
触媒温度が予め設定した下限触媒温度以下では前記空燃比リッチ制御を禁止すると共に、
NOx吸蔵量の推定値が予め設定されたリッチ開始閾値に達した第1タイミングと、リッチ間隔時間マップで設定された設定間隔時間に基づく第2タイミングとの両方を満たした場合に前記空燃比リッチ制御を開始し、
前記触媒装置の触媒温度とNOx吸蔵量の推定値のリッチ開始閾値に対する吸蔵比をベースに予め設定されたリッチ間隔補正係数を前記設定間隔時間に乗じて前記第2タイミングを補正することを特徴とする排気ガス浄化方法。 - 前記空燃比リッチ制御の開始後のリッチ状態を続ける継続時間が、NOx還元量の推定値がリッチ終了閾値に達した第3タイミングと、リッチ継続時間マップで規定されている設定継続時間を経過した第4タイミングとの両方を満たした場合に前記空燃比リッチ制御を終了すると共に、触媒温度に対応して設定された継続時間補正係数を前記設定継続時間に乗じて前記第4タイミングを補正することを特徴とする請求項4記載の排気ガス浄化方法。
- 前記リッチ間隔補正係数を、触媒温度が低いほど大きく、前記吸蔵比が小さいほど大きく設定し、前記継続時間補正係数を、触媒温度が低いほど大きく設定することを特徴とする請求項5記載の排気ガス浄化方法。
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JP2013203842A JP6252075B2 (ja) | 2013-09-30 | 2013-09-30 | 排気ガス浄化システム及び排気ガス浄化方法 |
EP14849939.5A EP3054120B1 (en) | 2013-09-30 | 2014-09-29 | Exhaust gas purification system and exhaust gas purification method |
US14/911,150 US9828899B2 (en) | 2013-09-30 | 2014-09-29 | Exhaust gas purification system and exhaust gas purification method |
CN201480041916.XA CN105408597B (zh) | 2013-09-30 | 2014-09-29 | 废气净化***以及废气净化方法 |
PCT/JP2014/075874 WO2015046508A1 (ja) | 2013-09-30 | 2014-09-29 | 排気ガス浄化システム及び排気ガス浄化方法 |
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WO2016117517A1 (ja) * | 2015-01-20 | 2016-07-28 | いすゞ自動車株式会社 | 排気浄化システム及びNOx浄化能力回復方法 |
WO2016117519A1 (ja) * | 2015-01-20 | 2016-07-28 | いすゞ自動車株式会社 | 排気浄化システム及びNOx浄化能力回復方法 |
JP2016166541A (ja) * | 2015-03-09 | 2016-09-15 | いすゞ自動車株式会社 | 排気浄化システム |
JP2018193873A (ja) * | 2017-05-12 | 2018-12-06 | いすゞ自動車株式会社 | 内燃機関の排気ガス浄化システム及び内燃機関の排気ガス浄化方法 |
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JP6547992B1 (ja) * | 2019-04-18 | 2019-07-24 | トヨタ自動車株式会社 | 酸素吸蔵量推定装置、酸素吸蔵量推定システム、内燃機関の制御装置、データ解析装置、および酸素吸蔵量推定方法 |
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US20160201587A1 (en) | 2016-07-14 |
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JP6252075B2 (ja) | 2017-12-27 |
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