JP2019178617A - 内燃機関の排気浄化装置 - Google Patents
内燃機関の排気浄化装置 Download PDFInfo
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Abstract
Description
元型触媒(SCR(Selective Catalytic Reduction)触媒)とを含む、内燃機関の排気
浄化装置に関する。
SR触媒によって排気中のNOXを吸蔵することができる温度範囲の上限値(以下、「吸蔵限界温度」と記す場合もある。)より高い状態であっても、SCR触媒のNH3吸着量が内燃機関から排出されるNOX量と当量なNH3量(以下、「下限吸着量」と記す場合もある。)以上であれば、内燃機関をリーン復帰させる一方で、SCR触媒のNH3吸着量が下限吸着量より少なければ、内燃機関をリーン復帰させないようにした。
る際に生成されるNH3がSCR触媒へ供給されることで、SCR触媒のNH3吸着量が増加する。そして、SCR触媒のNH3吸着量が上記下限吸着量以上まで増加すると、内燃機関の運転状態がリッチ運転状態からリーン運転状態へ移行されることになる。その場合、内燃機関から排出されるNOXの大部分がNSR触媒に吸蔵されずにSCR触媒へ流入することになるが、SCR触媒に吸着されているNH3を還元剤として利用することで、それらのNOXを還元及び浄化することができる。その結果、内燃機関の運転状態がリッチ運転状態からリーン運転状態へ移行された際に、大気中へ排出されるNOX量の増加が抑制される。
く還元性中間体と反応させることのできる炭化水素濃度を実現することができる振幅である。また、「所定の周期」は、活性NOXが酸化されるのに要する時間より短い周期である。
先ず、本発明の第1の実施例について図1乃至図5に基づいて説明する。図1は、本発明を適用する内燃機関とその吸排気系の概略構成を示す図である。
気中のNOXをN2に還元させる。
X等を還元するために利用される。
A/Fleanから所定のリッチ空燃比A/F1へ変更する際には、内燃機関1の要求トルクを満たすように燃料噴射量が決定されるとともに、混合気の空燃比A/Fが所定のリッチ空燃比A/F1となるように吸気絞り弁16の開度が決定されるものとする。これにより、内燃機関1の要求トルクを満たしつつ、混合気の空燃比A/Fを所定のリッチ空燃比A/F1にすることができる。なお、ここでいう所定のリッチ空燃比A/F1は、NSR触媒に吸蔵されているNOXの還元に適した空燃比であり、実験やシミュレーションの結果等に基づいて予め設定されている。
直後は、NSR触媒の床温Tnsrが上記吸蔵限界温度T2より高いため、内燃機関1から排出されるNOXの大部分がNSR触媒に吸蔵されない。それにより、NSR出NOX量が増加する。ただし、SCR触媒に上記下限吸着量Σnh3thre以上のNH3が吸着されているため、NSR触媒に吸蔵されないNOXがSCR触媒でNH3と反応することでN2に還元される。その結果、SCR出NOX量を略零に維持することが可能となる。上記したように、NSR触媒に吸蔵されないNOXがSCR触媒で還元及び浄化されると、SCR触媒のNH3吸着量Σnh3が減少していく。ただし、内燃機関1がリーン運転されているときは、NSR触媒においてNOXの還元反応が殆ど発現せず、且つ内燃機関1から排出される排気の温度も低めになるため、NSR触媒の床温Tnsrが速やかに低下する。そして、NSR触媒の床温Tnsrが上記吸蔵限界温度T2以下へ低下すると(図3中のt4)、内燃機関1から排出されるNOXがNSR触媒に吸蔵されるようになるため、NSR出NOX量が略零になり、それに応じてSCR触媒のNH3吸着量Σnh3の減少が抑制される。
からNSR触媒の床温Tnsrを推定することで、NSR触媒の床温Tnsrを取得する。なお、ECU7が該S103の処理を実行することにより、本発明に係る「温度取得手段」が実現される。
次に、本発明の第2の実施例について図6乃至図8に基づいて説明する。ここでは、前述した第1の実施例と異なる構成について説明し、同様の構成については説明を省略する。
路4に、該排気通路4を流通する排気へ燃料を添加するための燃料添加弁17が取り付けられる。該燃料添加弁17による燃料添加タイミングや燃料添加量は、ECU7によって制御されるようになっている。その他の構成は、前述した第1の実施例と同様である。
燃料添加弁17が制御された際に、NSR触媒で浄化することができる最大のNOX量又は該NOX量から所定のマージンを差し引いた量である。NSR触媒へ流入する排気の炭化水素濃度を上記所定の振幅及び上記所定の周期でもって振動させるべく燃料添加弁17が制御された際に、NSR触媒で浄化することができる最大のNOX量は、NSR触媒50の床温TnsrやNSR触媒へ流入する排気の温度が高くなるほど少なくなる傾向があるため、床温Tnsrや第1排気温度センサ8の測定値に基づいて、上記所定量Anoxが決定されればよい。
空燃比A/F2の混合気でリッチ運転させればよい。その後は、SCR触媒のNH3吸着量が下限吸着量Σnh3thre以上まで増加したとき、又は燃料添加処理の実行条件(NSR触媒50の床温Tnsrが所定の閾値Tthre以下であり、且つNSR入NOX量Anoxinが所定量Anox以下であること)が成立したときに、内燃機関1の運転状態をリッチ運転状態からリーン運転状態へ移行させればよい。
が、NSR触媒に吸蔵されないものの、NSR触媒で生成される還元性中間体によってN2に還元されることになる。その結果、NSR出NOX量を略零に維持することができ、それに伴ってSCR出NOX量も略零に維持するこができる。
2 燃料噴射弁
3 吸気通路
4 排気通路
5 第1触媒ケーシング
6 第2触媒ケーシング
7 ECU
8 第1排気温度センサ
9 第1NOXセンサ
10 第2排気温度センサ
11 第2NOXセンサ
12 第3排気温度センサ
15 エアフローメータ
16 吸気絞り弁
17 燃料添加弁
Claims (5)
- 内燃機関の排気通路に配置され、排気の空燃比がリーン空燃比であるときは排気中のNOXを吸蔵する一方で、排気の空燃比がリッチ空燃比であるときは排気中の還元剤を利用して吸蔵していたNOXを還元させるNOX吸蔵還元型触媒と、
前記NOX吸蔵還元型触媒より下流の前記排気通路に配置され、排気中のNH3を吸着し且つ吸着していたNH3を還元剤として利用することで排気中のNOXを還元する選択還元型触媒と、
を含む内燃機関の排気浄化装置において、
前記NOX吸蔵還元型触媒の温度を取得する温度取得手段と、
前記選択還元型触媒に吸着されているNH3量であるNH3吸着量を取得するNH3吸着量取得手段と、
前記内燃機関の運転状態をリッチ空燃比の混合気を燃焼させるリッチ運転状態からリーン空燃比の混合気を燃焼させるリーン運転状態へ移行させるためのリーン復帰要求が発生したときに、前記温度取得手段により取得される温度が前記NOX吸蔵還元型触媒によって排気中のNOXを吸蔵することができる温度範囲の上限値である吸蔵限界温度より高く且つ前記NH3吸着量取得手段により取得されるNH3吸着量が前記内燃機関から排出されるNOX量と当量なNH3量である下限吸着量以上であれば、前記内燃機関の運転状態をリッチ運転状態からリーン運転状態へ移行させる一方で、前記温度取得手段により取得される温度が前記吸蔵限界温度より高く且つ前記NH3吸着量取得手段により取得されるNH3吸着量が前記下限吸着量より少なければ、前記内燃機関の運転状態をリッチ運転状態からリーン運転状態へ移行させない、制御手段と、
を備える、
内燃機関の排気浄化装置。 - 前記リーン復帰要求が発生したときに、前記温度取得手段により取得される温度が前記吸蔵限界温度以下であれば、前記制御手段は、前記内燃機関の運転状態をリッチ運転状態からリーン運転状態へ移行させる、
請求項1に記載の内燃機関の排気浄化装置。 - 前記NOX吸蔵還元型触媒より上流の前記排気通路に配置され、該排気通路を流通する排気に燃料を添加する燃料添加弁を更に備え、
前記制御手段は、前記燃料添加弁による燃料添加量及び燃料添加タイミングを制御する機能を更に有しており、
前記リーン復帰要求が発生したときに、前記温度取得手段により取得される温度が前記吸蔵限界温度より高く且つ前記NH3吸着量取得手段により取得されるNH3吸着量が前記下限吸着量より少ない状態であっても、前記温度取得手段により取得される温度が前記吸蔵限界温度より高い所定の閾値以下であり且つ前記内燃機関から排出されるNOX量が所定量以下であれば、前記制御手段は、前記内燃機関の運転状態をリッチ運転状態からリーン運転状態へ移行させるとともに、前記NOX吸蔵還元型触媒に流入する排気の炭化水素濃度を所定の振幅及び所定の周期でもって振動させるべく前記燃料添加弁を制御する、請求項1又は2に記載の内燃機関の排気浄化装置。 - 前記所定量は、前記NOX吸蔵還元型触媒に流入する排気の炭化水素濃度を前記所定の振幅及び前記所定の周期でもって振動させるべく前記燃料添加弁が制御された際に、前記NOX吸蔵還元型触媒で浄化可能な最大のNOX量又は該NOX量から所定のマージンを差し引いた量である、
請求項3に記載の内燃機関の排気浄化装置。 - 前記NOX吸蔵還元型触媒と前記選択還元型触媒との間の前記排気通路に配置され、該
排気通路を流通する排気のNOX濃度を検出するNOXセンサを更に備え、
前記NH3吸着量取得手段は、前記NOXセンサの検出値に基づいて、前記選択還元型触媒のNH3吸着量を取得する、
請求項1から4の何れか1項に記載の内燃機関の排気浄化装置。
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008267217A (ja) * | 2007-04-18 | 2008-11-06 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP2009191823A (ja) * | 2008-02-18 | 2009-08-27 | Toyota Central R&D Labs Inc | NOx浄化装置 |
WO2011042997A1 (ja) * | 2009-10-09 | 2011-04-14 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP2012057571A (ja) * | 2010-09-10 | 2012-03-22 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP2014227978A (ja) * | 2013-05-27 | 2014-12-08 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP2017031960A (ja) * | 2015-08-06 | 2017-02-09 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP2017186997A (ja) * | 2016-04-08 | 2017-10-12 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP4304539B2 (ja) * | 2007-05-17 | 2009-07-29 | いすゞ自動車株式会社 | NOx浄化システムの制御方法及びNOx浄化システム |
US8381512B2 (en) * | 2008-05-02 | 2013-02-26 | GM Global Technology Operations LLC | Passive ammonia-selective catalytic reduction for NOx control in internal combustion engines |
KR101684502B1 (ko) | 2013-11-22 | 2016-12-08 | 현대자동차 주식회사 | 배기 가스 정화 장치 및 배기 가스 정화 방법 |
JP5920368B2 (ja) * | 2014-01-17 | 2016-05-18 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
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GB2541229A (en) | 2015-08-13 | 2017-02-15 | Gm Global Tech Operations Llc | Method of operating an automotive system |
US10443525B2 (en) | 2016-08-02 | 2019-10-15 | Mazda Motor Corporation | Exhaust emission control system of engine |
JP7151120B2 (ja) * | 2018-03-26 | 2022-10-12 | マツダ株式会社 | エンジンの触媒異常判定方法、及び、エンジンの触媒異常判定装置 |
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Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008267217A (ja) * | 2007-04-18 | 2008-11-06 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP2009191823A (ja) * | 2008-02-18 | 2009-08-27 | Toyota Central R&D Labs Inc | NOx浄化装置 |
WO2011042997A1 (ja) * | 2009-10-09 | 2011-04-14 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP2012057571A (ja) * | 2010-09-10 | 2012-03-22 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP2014227978A (ja) * | 2013-05-27 | 2014-12-08 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP2017031960A (ja) * | 2015-08-06 | 2017-02-09 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
JP2017186997A (ja) * | 2016-04-08 | 2017-10-12 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
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