WO2008029256A2 - Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine - Google Patents

Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine Download PDF

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Publication number
WO2008029256A2
WO2008029256A2 PCT/IB2007/002558 IB2007002558W WO2008029256A2 WO 2008029256 A2 WO2008029256 A2 WO 2008029256A2 IB 2007002558 W IB2007002558 W IB 2007002558W WO 2008029256 A2 WO2008029256 A2 WO 2008029256A2
Authority
WO
WIPO (PCT)
Prior art keywords
fuel ratio
air
catalyst
fuel
combustion engine
Prior art date
Application number
PCT/IB2007/002558
Other languages
English (en)
French (fr)
Other versions
WO2008029256A3 (en
Inventor
Takahiko Fujiwara
Norihisa Nakagawa
Naoto Kato
Shuntaro Okazaki
Koji Ide
Original Assignee
Toyota Jidosha Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Priority to EP07825062A priority Critical patent/EP2059665B1/en
Priority to US12/439,902 priority patent/US20100218485A1/en
Publication of WO2008029256A2 publication Critical patent/WO2008029256A2/en
Publication of WO2008029256A3 publication Critical patent/WO2008029256A3/en

Links

Classifications

    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • 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
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/0295—Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
    • 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
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/16—Oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0814—Oxygen storage amount

Definitions

  • the fuel injection amount control means may control the amount of fuel injected to the internal combustion engine by executing a feedback control on the air-fuel ratio based on a difference between the signal output from the air-fuel ratio sensor and a reference value corresponding to the stoichiometric air-fuel ratio while the fuel injection amount control means corrects the amount of fuel injected to the internal combustion engine based on a difference between the output signal from the oxygen sensor and the reference value corresponding to the stoichiometric air-fuel ratio.
  • FIG 1 is a graph showing a relation between the air-fuel ratio of exhaust gas flowing into a catal ⁇ 'st, and the amount of oxygen that may be stored in the catalyst or the amount of oxygen that may be released from the catalyst;
  • FIG 2 is a schematic diagram showing an internal combustion engine system in which an air-fuel ratio control apparatus according to an embodiment of the invention is employed;
  • FIG. 2 is a schematic diagram showing an internal combustion engine system that includes an air-fuel ratio control apparatus according to the embodiment of the invention.
  • an internal combustion engine 2 is connected to an exhaust passage 4.
  • At least the catalyst 6 on an upstream side has oxygen storage capacity.
  • “storage” used herein means retention of a substance (solid, liquid, gas molecules) in the form of at least one of adsorption, adhesion, absorption, trapping, occlusion, and others.
  • the level of the oxygen storage capacity of the catalyst 6 is estimated based on the amplitude of the output signal from the oxygen sensor 14. That is, by comparing the amplitude of the output signal from the oxygen sensorl 4 with the reference value, it is accurately determined whether the level of the oxygen storage capacity of the catalyst 6 is decreased.
  • step S6 a gain used to correct the fuel injection amount based on the difference between the output signal from the linear air-fuel ratio sensor 12 and the reference value corresponding to the
  • a limit may be imposed on a correction amount by which the fuel injection amount is corrected based on the difference between the output signal from the linear air-fuel ratio sensor 12 and the reference value corresponding to the stoichiometric air-fuel ratio in the main feedback control.
  • a limit may be imposed on a correction amount by which the fuel injection amount is corrected based on the difference between the output signal from the oxygen sensor 14 and the reference value corresponding to the stoichiometric air-fuel ratio in the sub feedback control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
PCT/IB2007/002558 2006-09-06 2007-09-05 Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine WO2008029256A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07825062A EP2059665B1 (en) 2006-09-06 2007-09-05 Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine
US12/439,902 US20100218485A1 (en) 2006-09-06 2007-09-05 Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-241633 2006-09-06
JP2006241633A JP4826398B2 (ja) 2006-09-06 2006-09-06 内燃機関の空燃比制御装置

Publications (2)

Publication Number Publication Date
WO2008029256A2 true WO2008029256A2 (en) 2008-03-13
WO2008029256A3 WO2008029256A3 (en) 2008-05-22

Family

ID=38961266

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/002558 WO2008029256A2 (en) 2006-09-06 2007-09-05 Air-fuel ratio control apparatus and air-fuel ratio control method for internal combustion engine

Country Status (4)

Country Link
US (1) US20100218485A1 (ja)
EP (1) EP2059665B1 (ja)
JP (1) JP4826398B2 (ja)
WO (1) WO2008029256A2 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8347866B2 (en) * 2009-09-29 2013-01-08 GM Global Technology Operations LLC Fuel control system and method for more accurate response to feedback from an exhaust system with an air/fuel equivalence ratio offset
CN102116190B (zh) * 2009-12-30 2014-01-15 中国第一汽车集团公司 一种新型三元催化转化器故障诊断方法
JP5794788B2 (ja) * 2011-02-16 2015-10-14 ダイハツ工業株式会社 空燃比制御装置
US10570844B2 (en) * 2012-01-18 2020-02-25 Ford Global Technologies, Llc Air/fuel imbalance monitor
JP6107586B2 (ja) * 2013-10-02 2017-04-05 トヨタ自動車株式会社 内燃機関の制御装置
JP6268976B2 (ja) * 2013-11-22 2018-01-31 トヨタ自動車株式会社 内燃機関の制御装置
KR20210088239A (ko) * 2020-01-06 2021-07-14 현대자동차주식회사 촉매의 산소 저장량에 기반한 공연비 제어 장치 및 방법

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05321721A (ja) 1992-05-19 1993-12-07 Honda Motor Co Ltd 内燃エンジンの空燃比制御装置
JPH09222010A (ja) 1996-02-15 1997-08-26 Nissan Motor Co Ltd エンジンの排気浄化装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2745761B2 (ja) * 1990-02-27 1998-04-28 株式会社デンソー 内燃機関の触媒劣化判定装置
US5313791A (en) * 1991-06-28 1994-05-24 Ford Motor Company Method for detecting catalyst malfunctions
JP2869847B2 (ja) * 1994-03-23 1999-03-10 本田技研工業株式会社 内燃機関の空燃比制御装置
JP3500941B2 (ja) * 1997-12-26 2004-02-23 日産自動車株式会社 排気浄化装置の診断装置
JP4031887B2 (ja) * 1999-06-10 2008-01-09 株式会社日立製作所 エンジンの空燃比制御装置および方法
JP4308396B2 (ja) * 2000-02-14 2009-08-05 本田技研工業株式会社 内燃機関の燃料供給制御装置
JP3528739B2 (ja) * 2000-02-16 2004-05-24 日産自動車株式会社 エンジンの排気浄化装置
DE10045610A1 (de) * 2000-09-15 2002-04-18 Volkswagen Ag Verfahren zur Regelung einer NOx-Regeneration eines NOx-Speicherkatalysators
JP3524490B2 (ja) * 2000-11-20 2004-05-10 本田技研工業株式会社 内燃機関の空燃比制御装置
JP3693942B2 (ja) * 2001-09-03 2005-09-14 三菱電機株式会社 内燃機関の空燃比制御装置
JP2003254129A (ja) * 2002-02-28 2003-09-10 Nissan Motor Co Ltd 排気浄化装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05321721A (ja) 1992-05-19 1993-12-07 Honda Motor Co Ltd 内燃エンジンの空燃比制御装置
JPH09222010A (ja) 1996-02-15 1997-08-26 Nissan Motor Co Ltd エンジンの排気浄化装置

Also Published As

Publication number Publication date
EP2059665B1 (en) 2012-08-15
US20100218485A1 (en) 2010-09-02
JP2008063994A (ja) 2008-03-21
JP4826398B2 (ja) 2011-11-30
WO2008029256A3 (en) 2008-05-22
EP2059665A2 (en) 2009-05-20

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