JP2019044611A - 内燃機関の排気装置 - Google Patents
内燃機関の排気装置 Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 70
- 239000000446 fuel Substances 0.000 claims abstract description 366
- 239000001257 hydrogen Substances 0.000 claims abstract description 128
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 128
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 124
- 239000007789 gas Substances 0.000 claims abstract description 71
- 230000004043 responsiveness Effects 0.000 claims abstract description 63
- 239000001301 oxygen Substances 0.000 claims abstract description 56
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 56
- 238000012937 correction Methods 0.000 claims abstract description 54
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000009792 diffusion process Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 abstract description 19
- 238000002347 injection Methods 0.000 description 22
- 239000007924 injection Substances 0.000 description 22
- 230000004044 response Effects 0.000 description 18
- 230000002596 correlated effect Effects 0.000 description 9
- 230000007423 decrease Effects 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 9
- 230000005856 abnormality Effects 0.000 description 8
- 238000004088 simulation Methods 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 7
- 238000003745 diagnosis Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000007784 solid electrolyte Substances 0.000 description 6
- 230000000875 corresponding effect Effects 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- -1 oxygen ions Chemical class 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000003411 electrode reaction Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
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- 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
- F02D41/1454—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 oxygen content or concentration or the air-fuel ratio
-
- 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
- F02D41/1477—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation circuit or part of it,(e.g. comparator, PI regulator, output)
- F02D41/1479—Using a comparator with variable reference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
- G01M15/104—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases using oxygen or lambda-sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
- G01N27/4175—Calibrating or checking the analyser
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- 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
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- 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
- F02D2041/147—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 a hydrogen content or concentration of the exhaust gases
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- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
- F02D2041/281—Interface circuits between sensors and control unit
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- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
- F02D41/2425—Particular ways of programming the data
- F02D41/2429—Methods of calibrating or learning
- F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
- F02D41/2474—Characteristics of sensors
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
これにより、水素による酸素センサの検出値と実際の値とのずれの影響を軽減することができる。
図1は、本実施形態に係る内燃機関1と、その吸気系および排気系と、の概略構成を示す図である。内燃機関1は車両駆動用の内燃機関である。ただし、内燃機関1はディーゼルエンジンであってもよく、ガソリンエンジンであってもよい。内燃機関1には排気通路2が接続されている。排気通路2には、触媒3が設けられている。なお、実施形態において触媒3は必須の構成ではない。
、検出空燃比が目標空燃比となるように燃料噴射弁6からの燃料噴射量をフィードバック制御する。また、例えば、ECU10は、検出空燃比と閾値とを比較することにより、燃料噴射弁6の異常診断を行う。なお、本実施形態においてはECU10が所定の処理を行うことにより、本発明における処理装置として機能する。
の差を小さくすることができる。
りも小さな所定リッチ空燃比とに交互に複数回変動させるアクティブ制御を実施したときには、空燃比が大きく変動する。このよう場合であっても、空燃比センサ11の応答性を精度よく求めることができる。なお、空燃比センサ11の応答性を求めるためにアクティブ制御を実施してもよいが、他の目的(例えば、異常診断)のためにアクティブ制御が実施されたときの検出空燃比を利用して空燃比センサ11の応答性を求めてもよい。応答性を精度よく算出するためには、空燃比がある程度変化したほうが良い。したがって、応答性を精度よく算出可能なほど空燃比が変化したときに応答性を算出してもよい。
気温度が高いほど、排気中の水素と酸素とが反応し易くなって水素が減少することから、水素濃度が低下する。したがって、排気温度と水素濃度とにも相関があるため、排気温度に基づいて水素濃度を推定することもできる。この場合、排気温度が低いときには高いときよりも水素濃度が高くなるように推定する。なお、排気の温度が所定温度以上の場合には、水素濃度を0としてもよい。この所定温度は、水素と酸素との反応が進んで排気中に水素が存在しなくなる温度である。これら排気の水素濃度と相関のあるパラメータを複数組み合わせて排気の水素濃度を推定してもよい。このようにして、ECU10は、水素濃度を随時推定する。なお、排気の水素濃度は上記に限らず他の手段により得てもよい。例えば、センサを用いて水素濃度を検出してもよい。
するパラメータとして、応答性の基準値と応答性の算出値との差または比を用いてもよい。応答性の基準値は、例えば、空燃比センサ11の新品時に想定される応答性であり、複数の空燃比センサ11の新品時の応答性を予め実験またはシミュレーション等により求めて平均値を算出し、この平均値を応答性の基準値として設定しておく。このようにして設定される応答性の基準値は、空燃比センサ11の個体差に関係なく一定の値であるが、これに代えて、空燃比センサ11の新品時に実際に求めた応答性をその空燃比センサ11の基準値として設定してもよい。応答性の基準値と応答性の算出値との差または比、排気の水素濃度、検出空燃比の補正量、との関係は、予め実験またはシミュレーション等により求めておく。
2 排気通路
3 触媒
6 燃料噴射弁
11 空燃比センサ
Claims (5)
- 内燃機関の排気通路に設けられ拡散律速層を有し排気の空燃比を検出する酸素センサと、
前記酸素センサの検出値を補正する制御装置であって、前記内燃機関の運転状態が同じ状態の下では、前記内燃機関の空燃比が変化したときの前記酸素センサの応答性が、高いときは低いときよりも、前記酸素センサの検出値の補正量を空燃比が大きくなる側により大きくする制御装置と、
を備える内燃機関の排気装置。 - 内燃機関の排気通路に設けられ拡散律速層を有し排気の空燃比を検出する酸素センサと、
前記酸素センサにより検出される空燃比と、比較対象となる空燃比と、を比較した結果に基づいて所定の処理を行う処理装置と、
前記比較対象となる空燃比を補正する制御装置であって、前記内燃機関の運転状態が同じ状態の下では、前記内燃機関の空燃比が変化したときの前記酸素センサの応答性が、高いときは低いときよりも、前記比較対象となる空燃比の補正量を空燃比が小さくなる側により大きくする制御装置と、
を備える内燃機関の排気装置。 - 前記制御装置は、排気の水素濃度が高いときは低いときよりも、補正量を大きくする請求項1または2に記載の内燃機関の排気装置。
- 前記制御装置は、前記内燃機関の負荷が高いときは低いときよりも、補正量を大きくする請求項1または2に記載の内燃機関の排気装置。
- 前記制御装置は、前記内燃機関の排気の温度が低いときには高いときよりも、補正量を大きくする請求項1,2,4の何れか1項に記載の内燃機関の排気装置。
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JP2017165572A JP6756317B2 (ja) | 2017-08-30 | 2017-08-30 | 内燃機関の排気装置 |
US16/111,566 US10865725B2 (en) | 2017-08-30 | 2018-08-24 | Exhaust system for internal combustion engine |
CN201810979902.2A CN109424454B (zh) | 2017-08-30 | 2018-08-27 | 内燃机的排气装置 |
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US11035315B2 (en) * | 2019-09-27 | 2021-06-15 | Ford Global Technologies, Llc | Modeling to compensate for HEGO sensor drift |
CN116165260A (zh) * | 2022-11-18 | 2023-05-26 | 长城汽车股份有限公司 | 氧含量检测装置、尾气含氧量检测方法及车辆 |
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JP2581828B2 (ja) * | 1990-06-01 | 1997-02-12 | 株式会社日立製作所 | 内燃機関の空燃比制御方法及びその制御装置 |
JP3799824B2 (ja) | 1998-06-26 | 2006-07-19 | 日産自動車株式会社 | 内燃機関の排気浄化装置 |
JP4198718B2 (ja) * | 2006-04-03 | 2008-12-17 | 本田技研工業株式会社 | 内燃機関の空燃比制御装置 |
JP5051660B2 (ja) * | 2008-01-08 | 2012-10-17 | 日本特殊陶業株式会社 | ガスセンサ素子及びガスセンサ |
DE112009005493T5 (de) * | 2009-02-20 | 2012-10-18 | Toyota Jidosha Kabushiki Kaisha | Fremdgezündete Brennkraftmaschine |
JP2011247093A (ja) | 2010-05-21 | 2011-12-08 | Honda Motor Co Ltd | 内燃機関の制御装置 |
JP5783091B2 (ja) | 2012-03-08 | 2015-09-24 | トヨタ自動車株式会社 | 空燃比センサの出力補正装置 |
RU2634911C2 (ru) * | 2013-06-26 | 2017-11-08 | Тойота Дзидося Кабусики Кайся | Система диагностики двигателя внутреннего сгорания |
US10100770B2 (en) * | 2015-06-30 | 2018-10-16 | Ford Global Technologies, Llc | Systems and methods for on-board cylinder leakdown testing |
US10019854B1 (en) * | 2017-03-08 | 2018-07-10 | Ford Global Technologies, Llc | Methods and systems to detect oxygen sensor degradation due to sealant off-gassing |
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US10865725B2 (en) | 2020-12-15 |
US20190063355A1 (en) | 2019-02-28 |
CN109424454B (zh) | 2021-09-07 |
JP6756317B2 (ja) | 2020-09-16 |
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