JP2012082710A - Noxセンサの劣化検出システム - Google Patents
Noxセンサの劣化検出システム Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- 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
- F01N3/0842—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—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
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—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
- 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
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/1431—Controller structures or design the system including an input-output delay
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- 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
- F02D41/1463—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 of the exhaust gases downstream of exhaust gas treatment apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
【解決手段】本発明は、内燃機関の排気通路に配置された三元触媒と、前記三元触媒より下流の排気通路に配置された選択還元型触媒と、前記選択還元型触媒より下流の排気通路に配置されたNOXセンサと、を備え、前記三元触媒へ流入する排気の空燃比をリッチにするための処理であるリッチ処理を実行し、該リッチ処理の実行開始から規定時間以内に前記NOXセンサの測定値が閾値以上に達しないことを条件に、NOXセンサが劣化していると判定するようにした。
【選択図】図3
Description
内燃機関の排気通路に配置された三元触媒と、
前記三元触媒より下流の排気通路に配置された選択還元型触媒と、
前記選択還元型触媒より下流の排気通路に配置されたNOXセンサと、
前記三元触媒へ流入する排気の空燃比をリッチにするための処理であるリッチ処理を実行するリッチ処理手段と、
前記リッチ処理手段によるリッチ処理が開始されてから規定時間以内に前記NOXセンサの測定値が閾値以上に達しないことを条件に、前記NOXセンサが劣化していると判定する判定手段と、
を備えるようにした。
の窒素(N2)と水素(H2)が反応してNH3が生成される。三元触媒および吸蔵還元型NOX触媒において生成されたNH3は、排気とともに第2排気浄化装置5へ流入し、選択還元型触媒に吸着される。選択還元型触媒に吸着されたアンモニア(NH3)は、排気の空燃比がリーンに戻されたときに、排気中のNOXを還元させる。つまり、選択還元型触媒は、三元触媒や吸蔵還元型NOX触媒において還元または吸蔵しきれなかったNOXをNH3により還元させる。その結果、大気中へ排出されるNOXやNH3を可及的に少なくすることができる。
速に増加して流入NH3量より若干低い値(図2中のV0)まで増加する(図2中のt3)。なお、以下では、センサ値V0を「正常値V0」と称する。一方、NOXセンサ8が劣化している場合は、選択還元型触媒の吸着能が飽和した後におけるセンサ値の増加速度が正常時より緩慢になるとともに、センサ値が正常値V0まで増加し難くなる。
2 排気通路
3 スタートコンバータ
4 第1排気浄化装置
5 第2排気浄化装置
6 A/Fセンサ
7 O2センサ
8 NOXセンサ
Claims (4)
- 内燃機関の排気通路に配置された三元触媒と、
前記三元触媒より下流の排気通路に配置された選択還元型触媒と、
前記選択還元型触媒より下流の排気通路に配置されたNOXセンサと、
前記三元触媒へ流入する排気の空燃比をリッチにするための処理であるリッチ処理を実行するリッチ処理手段と、
前記リッチ処理手段によるリッチ処理が開始されてから規定時間以内に前記NOXセンサの測定値が閾値以上に達しないことを条件に、前記NOXセンサが劣化していると判定する判定手段と、
を備えるNOXセンサの劣化検出システム。 - 請求項1において、前記リッチ処理手段によるリッチ処理が開始されてから規定時間以内に前記NOXセンサの測定値が閾値以上に達した場合に、リッチ処理終了後に排気の空燃比をリーンにするためのリーン処理を行うリーン処理手段をさらに備え、
前記判定手段は、前記リーン処理手段によるリーン処理の実行中における前記NOXセンサの測定値が前記閾値より小さい下限値未満であれば、前記NOXセンサが劣化していると判定するNOXセンサの劣化検出システム。 - 請求項1または2において、前記リッチ処理手段は、リッチ処理中に三元触媒へ流入する排気の空燃比をスライトリッチに調整するNOXセンサの劣化検出システム。
- 請求項1乃至3の何れか1項において、前記三元触媒と前記選択還元型触媒との間の排気通路には、吸蔵還元型NOX触媒が配置されるNOXセンサの劣化検出システム。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010227472A JP2012082710A (ja) | 2010-10-07 | 2010-10-07 | Noxセンサの劣化検出システム |
US13/253,713 US8485015B2 (en) | 2010-10-07 | 2011-10-05 | Degradation detection system for NOx sensor, and degradation detection method therefor |
Applications Claiming Priority (1)
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JP2010227472A JP2012082710A (ja) | 2010-10-07 | 2010-10-07 | Noxセンサの劣化検出システム |
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JP2012082710A true JP2012082710A (ja) | 2012-04-26 |
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JP2010227472A Pending JP2012082710A (ja) | 2010-10-07 | 2010-10-07 | Noxセンサの劣化検出システム |
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US (1) | US8485015B2 (ja) |
JP (1) | JP2012082710A (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015170643A1 (ja) * | 2014-05-08 | 2015-11-12 | いすゞ自動車株式会社 | 排気浄化システム |
WO2016017125A1 (en) | 2014-08-01 | 2016-02-04 | Toyota Jidosha Kabushiki Kaisha | Abnormality determination device for a nox sensor in a nox storage reduction catalyst using air-fuel ratio control |
JP2016056731A (ja) * | 2014-09-09 | 2016-04-21 | トヨタ自動車株式会社 | 空燃比センサの異常診断装置 |
WO2016194735A1 (ja) * | 2015-05-29 | 2016-12-08 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP2016223441A (ja) * | 2015-05-29 | 2016-12-28 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104334845A (zh) * | 2012-05-24 | 2015-02-04 | 丰田自动车株式会社 | 内燃机的排气净化装置 |
JP6037037B2 (ja) * | 2013-09-25 | 2016-11-30 | トヨタ自動車株式会社 | センサの異常診断装置 |
JP6572932B2 (ja) * | 2017-04-04 | 2019-09-11 | トヨタ自動車株式会社 | アンモニア検出装置の異常診断装置 |
CN113447617B (zh) * | 2021-06-24 | 2022-01-28 | 石家庄博飞电子科技有限公司 | 一种用于氮氧传感器的老化方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009046992A (ja) * | 2007-08-13 | 2009-03-05 | Toyota Motor Corp | NOxセンサの異常診断装置 |
JP2009097471A (ja) * | 2007-10-18 | 2009-05-07 | Toyota Motor Corp | 内燃機関の排気浄化システム |
JP2009185754A (ja) * | 2008-02-08 | 2009-08-20 | Bosch Corp | Noxセンサの合理性診断装置及び合理性診断方法、並びに内燃機関の排気浄化装置 |
JP2010112345A (ja) * | 2008-11-10 | 2010-05-20 | Mitsubishi Motors Corp | 排気浄化装置 |
JP2010174695A (ja) * | 2009-01-28 | 2010-08-12 | Toyota Motor Corp | NOxセンサの故障診断システム及び故障診断方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4537417B2 (ja) * | 2007-03-06 | 2010-09-01 | トヨタ自動車株式会社 | NOxセンサの異常診断装置 |
JP4924217B2 (ja) | 2007-06-06 | 2012-04-25 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
-
2010
- 2010-10-07 JP JP2010227472A patent/JP2012082710A/ja active Pending
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2011
- 2011-10-05 US US13/253,713 patent/US8485015B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009046992A (ja) * | 2007-08-13 | 2009-03-05 | Toyota Motor Corp | NOxセンサの異常診断装置 |
JP2009097471A (ja) * | 2007-10-18 | 2009-05-07 | Toyota Motor Corp | 内燃機関の排気浄化システム |
JP2009185754A (ja) * | 2008-02-08 | 2009-08-20 | Bosch Corp | Noxセンサの合理性診断装置及び合理性診断方法、並びに内燃機関の排気浄化装置 |
JP2010112345A (ja) * | 2008-11-10 | 2010-05-20 | Mitsubishi Motors Corp | 排気浄化装置 |
JP2010174695A (ja) * | 2009-01-28 | 2010-08-12 | Toyota Motor Corp | NOxセンサの故障診断システム及び故障診断方法 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015170643A1 (ja) * | 2014-05-08 | 2015-11-12 | いすゞ自動車株式会社 | 排気浄化システム |
JP2015214899A (ja) * | 2014-05-08 | 2015-12-03 | いすゞ自動車株式会社 | 排気浄化システム |
US10100698B2 (en) | 2014-05-08 | 2018-10-16 | Isuzu Motors Limited | Exhaust purification system |
WO2016017125A1 (en) | 2014-08-01 | 2016-02-04 | Toyota Jidosha Kabushiki Kaisha | Abnormality determination device for a nox sensor in a nox storage reduction catalyst using air-fuel ratio control |
JP2016056731A (ja) * | 2014-09-09 | 2016-04-21 | トヨタ自動車株式会社 | 空燃比センサの異常診断装置 |
WO2016194735A1 (ja) * | 2015-05-29 | 2016-12-08 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP2016223441A (ja) * | 2015-05-29 | 2016-12-28 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
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US20120085143A1 (en) | 2012-04-12 |
US8485015B2 (en) | 2013-07-16 |
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