JP2013177884A - 内燃機関の排出ガス浄化装置 - Google Patents
内燃機関の排出ガス浄化装置 Download PDFInfo
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Abstract
【解決手段】NOX 吸蔵還元型触媒19の下流側に酸素センサ28を設置したシステムにおいて、酸素センサ28の外部に設けた定電流回路によりセンサ電極間に定電流を流すことで、酸素センサ28の出力特性を変更できるようにする。更に、エンジン11のリーン燃焼制御中には、酸素センサ28のリーン成分に対する検出応答性を高めることで、触媒19の下流側にNOX (リーン成分)が排出されたときに、それを酸素センサ28で早期に検出できようにする。一方、リッチ燃焼制御中には、酸素センサ28のリッチ成分に対する検出応答性を高めることで、触媒19の下流側にHCやCO(リッチ成分)が排出されたときに、それを酸素センサ28で早期に検出できるようにする。
【選択図】図1
Description
酸素センサの出力Eは、下記の基本式(ネルンストの式)で表すことができる。
E=(R×T)/(4×F)×ln(P1 /P2 )
ここで、Rは気体定数、Tは絶対温度、Fはファラデー定数、P1 は大気側(基準極側)の酸素分圧、P2 は排気側(測定極側)の酸素分圧である。
まず、図1に基づいてエンジン制御システム全体の概略構成を説明する。
酸素センサ28は、コップ型構造のセンサ素子31を有しており、実際には当該センサ素子31は素子全体が図示しないハウジングや素子カバー内に収容される構成となっており、エンジン11の排気管17内に配設されている。
(2) NOX 吸蔵還元型触媒19が活性状態であること(例えば、触媒19の推定温度又は検出温度が活性温度以上であること、或は、エンジン始動後の経過時間が所定時間以上であること)
(3) システムの各部(例えば燃料系や排気系等)に異常がないこと
E=(R×T)/(4×F)×ln(P1 /P2 )
ここで、Rは気体定数、Tは絶対温度、Fはファラデー定数、P1 は大気側電極層34側の酸素分圧、P2 は排気側電極層33側の酸素分圧である。
(2) エンジン11の油温(潤滑油の温度)が所定温度以下であること
(3) 燃料経路内の燃料温度が所定温度以下であること
(5) 気筒内での燃焼圧が所定値以上であること
(6) アクセル開度が所定値以上であること
Claims (4)
- 内燃機関(11)の排出ガス浄化用の触媒(18,19)と、前記触媒(18,19)の下流側又は該触媒(18,19)に設置され、一対のセンサ電極(33,34)間に固体電解質体(32)が設けられると共に該一対のセンサ電極(33,34)のうちの一方のセンサ電極(34)が大気に晒されたセンサ素子(31)により排出ガス中の所定成分の濃度を検出する排出ガスセンサ(28)とを備えた内燃機関の排出ガス浄化装置において、
前記センサ電極(33,34)間に定電流を流して前記排出ガスセンサ(28)の出力特性を変更する定電流供給手段(27)と、
前記排出ガスセンサ(28)の出力特性を変更する変更要求又は前記内燃機関(11)の運転状態に応じて前記センサ電極(33,34)間に流す定電流の向きを決定し、該決定した向きで前記定電流が流れるように前記定電流供給手段(27)を制御する電流制御手段(25)と
を備えていることを特徴とする内燃機関の排出ガス浄化装置。 - 前記触媒は、該触媒に流入する排出ガスの空燃比がリーンのときに該排出ガス中のNOX を吸蔵し、該触媒に流入する排出ガスの空燃比がリッチになったときに該触媒に吸蔵されているNOX を還元浄化して放出するNOX 吸蔵還元型触媒(19)であることを特徴とする請求項1に記載の内燃機関の排出ガス浄化装置。
- 前記電流制御手段(25)は、前記内燃機関(11)に供給する混合気の空燃比をリーンに制御するリーン燃焼制御中には前記排出ガスセンサ(28)のリーン成分に対する検出応答性を高める方向に前記定電流が流れるように前記定電流供給手段(27)を制御し、前記内燃機関(11)に供給する混合気の空燃比をリッチに制御するリッチ燃焼制御中には前記排出ガスセンサ(28)のリッチ成分に対する検出応答性を高める方向に前記定電流が流れるように前記定電流供給手段(27)を制御することを特徴とする請求項2に記載の内燃機関の排出ガス浄化装置。
- 前記触媒は、前記排出ガス中のCO、HC、NOX を浄化する三元触媒(18)であることを特徴とする請求項1に記載の内燃機関の排出ガス浄化装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012221944A JP5867357B2 (ja) | 2012-02-03 | 2012-10-04 | 内燃機関の排出ガス浄化装置 |
US14/376,179 US20140373512A1 (en) | 2012-02-03 | 2013-01-22 | Emission gas cleaning device of internal combustion engine |
DE112013000824.6T DE112013000824T5 (de) | 2012-02-03 | 2013-01-22 | Abgasreinigungsvorrichtung einer Brennkraftmaschine |
PCT/JP2013/000284 WO2013114814A1 (ja) | 2012-02-03 | 2013-01-22 | 内燃機関の排出ガス浄化装置 |
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Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012022261 | 2012-02-03 | ||
JP2012022261 | 2012-02-03 | ||
JP2012221944A JP5867357B2 (ja) | 2012-02-03 | 2012-10-04 | 内燃機関の排出ガス浄化装置 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2015045380A1 (ja) * | 2013-09-27 | 2015-04-02 | 株式会社デンソー | ガスセンサ制御装置 |
JP2016217227A (ja) * | 2015-05-19 | 2016-12-22 | 株式会社デンソー | 酸素センサの制御方法 |
US9594049B2 (en) | 2013-08-09 | 2017-03-14 | Denso Corporation | Gas sensor control apparatus |
US9664640B2 (en) | 2013-08-09 | 2017-05-30 | Denso Corporation | Gas sensor control apparatus |
US9816961B2 (en) | 2013-08-09 | 2017-11-14 | Denso Corporation | Gas sensor control apparatus |
US9964513B2 (en) | 2013-08-09 | 2018-05-08 | Denso Corporation | Gas sensor control apparatus |
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JP5748180B2 (ja) * | 2012-02-10 | 2015-07-15 | 株式会社デンソー | 触媒の劣化診断装置 |
JP6155949B2 (ja) * | 2013-08-09 | 2017-07-05 | 株式会社デンソー | ガスセンサ制御装置 |
US10539058B2 (en) * | 2015-08-05 | 2020-01-21 | Cummins Emission Solutions Inc. | Oxygen correction for engine-out NOx estimates using a NOx sensor of an aftertreatment system |
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- 2012-10-04 JP JP2012221944A patent/JP5867357B2/ja not_active Expired - Fee Related
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2013
- 2013-01-22 DE DE112013000824.6T patent/DE112013000824T5/de not_active Withdrawn
- 2013-01-22 US US14/376,179 patent/US20140373512A1/en not_active Abandoned
- 2013-01-22 WO PCT/JP2013/000284 patent/WO2013114814A1/ja active Application Filing
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JPH0820414B2 (ja) * | 1980-11-17 | 1996-03-04 | トムソン−セーエスエフ | 流体混合物に含まれている反応物の濃度を検出するための電気化学的センサー及び該センサーを使用する空気−燃料混合気の混合比調整システム |
JPS57200641A (en) * | 1981-06-01 | 1982-12-08 | Nippon Denso Co Ltd | Controlling device for air-fuel ratio |
JPS61104137A (ja) * | 1984-10-27 | 1986-05-22 | Mazda Motor Corp | エンジンの空燃比制御装置 |
JPS61118653A (ja) * | 1984-11-14 | 1986-06-05 | Ngk Insulators Ltd | 電気化学的素子の電流制御方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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US9594049B2 (en) | 2013-08-09 | 2017-03-14 | Denso Corporation | Gas sensor control apparatus |
US9664640B2 (en) | 2013-08-09 | 2017-05-30 | Denso Corporation | Gas sensor control apparatus |
US9816961B2 (en) | 2013-08-09 | 2017-11-14 | Denso Corporation | Gas sensor control apparatus |
US9964513B2 (en) | 2013-08-09 | 2018-05-08 | Denso Corporation | Gas sensor control apparatus |
US10302588B2 (en) | 2013-08-09 | 2019-05-28 | Denso Corporation | Gas sensor control method |
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JP2016217227A (ja) * | 2015-05-19 | 2016-12-22 | 株式会社デンソー | 酸素センサの制御方法 |
Also Published As
Publication number | Publication date |
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DE112013000824T5 (de) | 2014-10-16 |
WO2013114814A1 (ja) | 2013-08-08 |
JP5867357B2 (ja) | 2016-02-24 |
US20140373512A1 (en) | 2014-12-25 |
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