JP2020060128A - アンモニアセンサの異常判定装置 - Google Patents
アンモニアセンサの異常判定装置 Download PDFInfo
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- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- 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]
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- 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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/03—Monitoring or diagnosing the deterioration of exhaust systems of sorbing activity of adsorbents or absorbents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
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- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
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- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
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- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
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- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1818—Concentration of the reducing agent
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- 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
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- 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
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- Y02T10/40—Engine management systems
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Abstract
Description
本発明は、上記実施形態に限定されず、例えば以下のように実施してもよい。
・燃料噴射休止中以外にもアンモニアセンサの異常判定処理を行ってもよい。燃料噴射休止中以外に異常判定処理を行う場合には、S11、S13及びS16の処理は省略する。ただし、燃料噴射休止中以外にアンモニアセンサの異常判定処理を行う場合には、排気中にNOxも共存するため、NOxセンサの出力は、NOx由来の出力とアンモニア由来の出力との両方を含んでいる。そのため、例えば、エンジン負荷や燃料噴射量といったECU50の出力するエンジンパラメータから排気中のNOx濃度を推定したり、第1複合センサ24で検出したNOxセンサの出力から下流側触媒22通過後のNOx濃度を推定したりして、NOx由来の出力を算出する。そして、NOxセンサの出力からNOx由来の出力を差し引くことで、NOxセンサでのアンモニア由来の出力を算出することができる。
Claims (5)
- 内燃機関(10)の排気通路(12)に設けられ、アンモニアを用いて排気中の窒素酸化物を浄化させる選択還元型の触媒(22)と、
前記排気通路における前記触媒の上流側に、アンモニアを生成するための還元剤を供給する供給装置(23)と、
前記触媒の下流側に設けられ、排気中のアンモニア濃度に応じたセンサ信号を出力するアンモニアセンサ(25)と、
前記触媒の下流側に設けられ、排気中のNOx濃度に応じたセンサ信号を出力するNOxセンサ(25)と、
前記触媒の下流側に設けられ、排気中の酸素濃度に応じたセンサ信号を出力する酸素センサ(25)と、
を備える排気浄化システムにおける前記アンモニアセンサの異常判定装置(30)であって、
前記供給装置による還元剤の供給休止後に前記触媒へのアンモニア供給が継続される継続期間において、前記アンモニアセンサの出力と前記酸素センサの出力とに基づいて、触媒下流側におけるアンモニア濃度を第1濃度値として算出する第1算出部と、
前記継続期間において、前記NOxセンサの出力と前記酸素センサの出力とに基づいて、触媒下流側におけるアンモニア濃度を第2濃度値として算出する第2算出部と、
前記第1濃度値と前記第2濃度値とに基づいて、前記アンモニアセンサの異常の有無を判定する異常判定部と、
を備えるアンモニアセンサの異常判定装置。 - 前記内燃機関の燃焼休止に伴い前記酸素センサによる酸素濃度の検出値が所定値よりも大きくなる状態であり、かつ前記継続期間である場合に、前記第1算出部による前記第1濃度値の算出と、前記第2算出部による前記第2濃度値の算出とを行わせる請求項1に記載のアンモニアセンサの異常判定装置。
- 前記内燃機関の燃焼休止に伴い前記酸素センサによる酸素濃度の検出値が所定値よりも大きくなる状態であり、かつ前記継続期間である場合に、前記第1算出部により算出された複数の前記第1濃度値と、前記第2算出部により算出された複数の前記第2濃度値とに基づいて、前記アンモニアセンサの異常の有無を判定する請求項2に記載のアンモニアセンサの異常判定装置。
- 前記第1濃度値と前記第2濃度値とを比較し、その比較結果に基づいて、前記アンモニアの出力を補正する補正部を備える請求項1から請求項3のいずれか一項に記載のアンモニアセンサの異常判定装置。
- 前記補正部は、前記第1濃度値と前記第2濃度値との差異が、第1閾値よりも大きく、かつその第1閾値よりも大きい第2閾値よりも小さい場合に、前記アンモニアセンサの出力を補正し、前記第1濃度値と前記第2濃度値との差異が前記第2閾値より大きい場合に、前記アンモニアセンサの出力を補正せず、前記アンモニアセンサの異常発生を通知する請求項4に記載のアンモニアセンサの異常判定装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2018191238A JP2020060128A (ja) | 2018-10-09 | 2018-10-09 | アンモニアセンサの異常判定装置 |
DE112019005050.8T DE112019005050T5 (de) | 2018-10-09 | 2019-09-11 | Ammoniaksensor-Abnormalität-Bestimmungsgerät |
PCT/JP2019/035763 WO2020075438A1 (ja) | 2018-10-09 | 2019-09-11 | アンモニアセンサの異常判定装置 |
US17/223,579 US11492950B2 (en) | 2018-10-09 | 2021-04-06 | Abnormality determination apparatus for ammonia sensor |
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JP2015215334A (ja) * | 2014-04-22 | 2015-12-03 | 株式会社デンソー | NOx濃度測定システム |
JP2016223446A (ja) * | 2015-06-02 | 2016-12-28 | 日本特殊陶業株式会社 | 濃度算出装置および濃度算出方法 |
JP2017078584A (ja) * | 2015-10-19 | 2017-04-27 | 本田技研工業株式会社 | 湿度推定方法及び内燃機関の排気浄化システム |
JP2017141713A (ja) * | 2016-02-09 | 2017-08-17 | トヨタ自動車株式会社 | 排気浄化機構の異常診断装置 |
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JPS59183112A (ja) * | 1983-04-01 | 1984-10-18 | 株式会社中尾金属梯子製作所 | フツク構造 |
JP6238564B2 (ja) | 2013-05-16 | 2017-11-29 | ボッシュ株式会社 | 診断装置、排気浄化装置、および診断方法 |
US10094262B2 (en) * | 2015-06-02 | 2018-10-09 | Ngk Spark Plug Co., Ltd. | Concentration determination device and method |
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2019
- 2019-09-11 DE DE112019005050.8T patent/DE112019005050T5/de not_active Withdrawn
- 2019-09-11 WO PCT/JP2019/035763 patent/WO2020075438A1/ja active Application Filing
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2021
- 2021-04-06 US US17/223,579 patent/US11492950B2/en active Active
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JP2003328860A (ja) * | 2002-05-15 | 2003-11-19 | Ishikawajima Harima Heavy Ind Co Ltd | 臭気ガスの燃焼脱臭方法及び装置 |
JP2006238564A (ja) * | 2005-02-23 | 2006-09-07 | Seiko Epson Corp | 圧電アクチュエータの駆動方法、圧電アクチュエータの駆動装置、電子機器、圧電アクチュエータの駆動装置の制御プログラム及び記憶媒体 |
JP2008202425A (ja) * | 2007-02-16 | 2008-09-04 | Mitsubishi Motors Corp | 排ガス浄化装置 |
JP2008291761A (ja) * | 2007-05-25 | 2008-12-04 | Toyota Motor Corp | 内燃機関の制御装置 |
JP2011117462A (ja) * | 2011-03-22 | 2011-06-16 | Toyota Motor Corp | 内燃機関の制御装置 |
JP2015215334A (ja) * | 2014-04-22 | 2015-12-03 | 株式会社デンソー | NOx濃度測定システム |
JP2016223446A (ja) * | 2015-06-02 | 2016-12-28 | 日本特殊陶業株式会社 | 濃度算出装置および濃度算出方法 |
JP2017078584A (ja) * | 2015-10-19 | 2017-04-27 | 本田技研工業株式会社 | 湿度推定方法及び内燃機関の排気浄化システム |
JP2017141713A (ja) * | 2016-02-09 | 2017-08-17 | トヨタ自動車株式会社 | 排気浄化機構の異常診断装置 |
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US11492950B2 (en) | 2022-11-08 |
DE112019005050T5 (de) | 2021-06-24 |
US20210222607A1 (en) | 2021-07-22 |
WO2020075438A1 (ja) | 2020-04-16 |
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