JP2016537554A - 内燃機関の排気ガス浄化システムを動作する方法 - Google Patents
内燃機関の排気ガス浄化システムを動作する方法 Download PDFInfo
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- F01N3/18—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 methods of operation; Control
- F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- F02D41/146—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an NOx content or concentration
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- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/25—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an ammonia generator
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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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Abstract
Description
SNH3=OSCNSC−Σ(OSCNSC+SNOx)+Σ(SNOx+SNH3)
SNOx=Σ(OSCNSC+SNOx)−OSCNSC
Claims (8)
- 空気過剰状態で運転される希薄燃焼運転モードと、空気欠乏状態で運転される燃料過多燃焼運転モードとで運転可能な内燃機関の排気ガスを浄化する排気ガス浄化システム(1)を動作する方法であって、
前記排気ガス浄化システム(1)が、排気ガスの流れ方向に順番に配置されている、
還元条件では少なくとも部分的に、排気ガスに含まれる酸化窒素を触媒作用でアンモニアにすることができるアンモニア生成触媒(5)と、
第1の排気ガスセンサ(S1)と、
アンモニア貯蔵力を有するアンモニアSCR触媒(7)と、
前記アンモニアSCR触媒(7)のすぐ下流側に配置された、酸素貯蔵力と酸化窒素貯蔵力とを有する酸化窒素貯蔵触媒(8)と、
第2の排気ガスセンサ(S2)とを備え、
第1及び第2の排気ガスセンサ(S1、S2)として、排気ガスの酸化窒素含有量と相関する第1の信号(Ss1、SS2)と、排気ガスのラムダ値と相関する第2の信号(λS1、λS2)とを発信可能である排気ガスセンサが使用され、診断運転では希薄燃焼運転モードと燃料過多燃焼運転モードとを有する内燃機関の互いに直に続く運転段階で第1及び第2の排気ガスセンサ(S1、S2)の第1及び第2の信号を評価することによって、アンモニアSCR触媒(7)のアンモニア貯蔵力、酸化窒素貯蔵触媒(8)の酸素貯蔵力、及びオプションとして酸化窒素貯蔵触媒(8)の酸化窒素貯蔵力が判定される方法。 - 診断運転において、酸化窒素貯蔵触媒(8)の酸素貯蔵力と酸化窒素貯蔵力との第1の貯蔵力合計値と、酸化窒素貯蔵触媒(8)の酸化窒素貯蔵力とNH3−SCR触媒(7)のアンモニア貯蔵力との第2の貯蔵力合計値とが判定され、判定された酸素貯蔵力と、第1及び第2の貯蔵力合計値とを相殺することによって、アンモニアSCR触媒(7)のNH3貯蔵力が判定されることを特徴とする請求項1に記載の方法。
- 診断運転において、酸化窒素貯蔵触媒(8)の酸素貯蔵力と酸化窒素貯蔵力との第1の貯蔵力合計値が判定され、判定された酸素貯蔵力を第1の貯蔵力合計値と相殺することによって、酸化窒素貯蔵触媒(8)の酸化窒素貯蔵力が判定されることを特徴とする請求項1又は請求項2に記載の方法。
- 診断運転において、内燃機関は、アンモニアSCR触媒(7)のアンモニア貯蔵力が、燃料過多燃焼運転モードでアンモニア生成触媒(5)で生成され、排気ガスと共にアンモニアSCR触媒(7)に入るアンモニアの受容によって少なくとも大幅に消耗し、酸化窒素貯蔵触媒(8)から貯蔵された酸化窒素及び酸素の少なくとも大部分が放出されるまで第1の方法ステップで運転され、直後の第2の方法ステップで内燃機関の運転の希薄燃焼運転モードへの切換えが行われ、燃料過多燃焼から希薄燃焼への切換えを示す第1の排気ガスセンサ(S1)の第2の信号(λS1)と、燃料過多燃焼から希薄燃焼への切換えを示す第2の排気ガスセンサ(S2)の第2の信号(λS2)との間の時間遅延から酸化窒素貯蔵触媒(8)の酸素貯蔵力が判定されることを特徴とする請求項1〜請求項3のいずれか一項に記載の方法。
- 診断運転において、内燃機関は、アンモニアSCR触媒(7)のアンモニア貯蔵力が、燃料過多燃焼運転モードでアンモニア生成触媒(5)で生成され、排気ガスと共にアンモニアSCR触媒(7)に入るアンモニアの受容によって少なくとも大幅に消耗し、酸化窒素貯蔵触媒(8)から貯蔵された酸化窒素及び酸素の少なくとも大部分が放出されるまで燃料過多燃焼運転モードで運転され、直後の第2の方法ステップで、内燃機関の運転の希薄燃焼運転モードへの切換えが行われ、第3の方法ステップで、内燃機関は、酸化窒素貯蔵触媒(8)の酸化窒素貯蔵力が排気ガスと共に酸化窒素貯蔵触媒(8)に入る酸化窒素が貯蔵されることによって少なくとも大幅に消耗するまで希薄燃焼運転モードで運転され、第3の方法ステップの時間に積分された第1及び第2の排気ガスセンサ(S1、S2)の第1の信号(SS1、SS2)から第2の貯蔵力合計値が判定されることを特徴とする請求項2〜請求項4のいずれか一項に記載の方法。
- 診断運転では、酸化窒素貯蔵触媒(8)の酸化窒素貯蔵力が少なくともほぼ消耗した内燃機関の希薄燃焼運転から始まって、内燃機関の運転の燃料過多燃焼運転モードへの切換えが行われ、燃料過多燃焼運転モードは、第2の排気ガスセンサ(S2)の第2の信号(λS2)が希薄燃焼から燃料過多燃焼への切換えを示し、少なくとも希薄燃焼運転モードから燃料過多燃焼運転モードへの切換えを示す第1の排気ガスセンサ(S1)の第2の信号(λS1)と、希薄燃焼運転モードから燃料過多燃焼運転モードへの切換えを示す第2の排気ガスセンサ(S2)の第2の信号(λS2)との間の時間遅延が判定されるまで維持されることを特徴とする請求項2〜請求項5のいずれか一項に記載の方法。
- 第1の貯蔵力合計値を判定するため、補足的に内燃機関の希薄燃焼動作モードから燃料過多燃焼運転モードへの切換えと共に行われる、酸化窒素貯蔵触媒(8)から還元されずに脱着する酸化窒素の放出が、第2の排気ガスセンサ(S2)の第1の信号の要約的な検出によって考慮されることを特徴とする請求項6に記載の方法。
- 内燃機関は診断運転以外では、希薄燃焼運転モードと燃料過多燃焼運転モードで交互の運転段階で運転され、燃料過多燃焼運転モードでのそれぞれの運転段階は遅くとも、アンモニアSCR触媒(7)に貯蔵されているアンモニア量が、アンモニアSCR触媒(7)のアンモニア貯蔵力未満である所定の閾値に達すると終了することを特徴とする請求項1〜請求項7のいずれか一項に記載の方法。
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PCT/EP2014/002885 WO2015070950A1 (de) | 2013-11-13 | 2014-10-25 | Verfahren zum betreiben eines abgasreinigungssystems einer brennkraftmaschine |
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JP6350444B2 (ja) * | 2015-08-10 | 2018-07-04 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
DE102016112363B4 (de) * | 2016-07-06 | 2023-02-09 | Denso Corporation | Abgasnachbehandlungssystem |
US11339701B2 (en) | 2016-10-24 | 2022-05-24 | Basf Corporation | Integrated SCR catalyst and LNT for NOx abatement |
DE102016221272A1 (de) * | 2016-10-28 | 2018-05-03 | Ford Global Technologies, Llc | Verfahren zum Betrieb einer Abgasnachbehandlungsvorrichtung eines Kraftfahrzeugs |
DE102016221812A1 (de) * | 2016-11-08 | 2018-05-09 | Robert Bosch Gmbh | Verfahren zur Erkennung einer Störung in einem einen Abgasstrom eines Verbrennungsmotors führenden Abgassystem |
US10865721B1 (en) * | 2019-11-11 | 2020-12-15 | Ford Global Technologies, Llc | Method and system for measuring and balancing cylinder air-fuel ratio |
US11881093B2 (en) | 2020-08-20 | 2024-01-23 | Denso International America, Inc. | Systems and methods for identifying smoking in vehicles |
US12017506B2 (en) | 2020-08-20 | 2024-06-25 | Denso International America, Inc. | Passenger cabin air control systems and methods |
US11760169B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Particulate control systems and methods for olfaction sensors |
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US11636870B2 (en) | 2020-08-20 | 2023-04-25 | Denso International America, Inc. | Smoking cessation systems and methods |
US11828210B2 (en) | 2020-08-20 | 2023-11-28 | Denso International America, Inc. | Diagnostic systems and methods of vehicles using olfaction |
US11932080B2 (en) | 2020-08-20 | 2024-03-19 | Denso International America, Inc. | Diagnostic and recirculation control systems and methods |
US11760170B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Olfaction sensor preservation systems and methods |
DE102022210818B3 (de) | 2022-10-13 | 2024-01-11 | Vitesco Technologies GmbH | Verfahren, Computerprogramm und Steuerungsvorrichtung zum Betreiben einer Brennkraftmaschine |
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