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JPS6487846A - Air-fuel ratio control device for internal combustion engine - Google Patents

Air-fuel ratio control device for internal combustion engine

Info

Publication number
JPS6487846A
JPS6487846A JP24389787A JP24389787A JPS6487846A JP S6487846 A JPS6487846 A JP S6487846A JP 24389787 A JP24389787 A JP 24389787A JP 24389787 A JP24389787 A JP 24389787A JP S6487846 A JPS6487846 A JP S6487846A
Authority
JP
Japan
Prior art keywords
sensor
nox
air
fuel ratio
reference value
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP24389787A
Other languages
Japanese (ja)
Inventor
Shinpei Nakaniwa
Akira Uchikawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Unisia Automotive Ltd
Original Assignee
Japan Electronic Control Systems Co Ltd
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 Japan Electronic Control Systems Co Ltd filed Critical Japan Electronic Control Systems Co Ltd
Priority to JP24389787A priority Critical patent/JPS6487846A/en
Publication of JPS6487846A publication Critical patent/JPS6487846A/en
Pending legal-status Critical Current

Links

Landscapes

  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE:To attempt an improvement in exhaust emission characteristics by comparing the output of an O2 sensor which allows electric motive force to be shifted on the rich side as NOx is increased by the action of NOx reducing catalizer, with a reference value varied to the lean side in the operating condition of an increase in NOx. CONSTITUTION:A control unit 16 including an air flow meter 13, a water temperature sensor 17 and a NOx reducing layer 5, to which detected values from an O2 sensor 19 allowing electric motive force to be shifted on the rich sides as NOx concentration in exhaust gas is high, and from a crank angle sensor 21 and the like are inputted so as to perform an operational control of the opening time for a fuel injection valve 15. The control unit 16 sets up a reference value corresponding to an air-fuel ratio on the lean side at the operation condition of high combustion temperature based on both revolutions and the basic quantity of fuel injection, following which, the feedback control of the air-fuel ratio is performed based on the deviation between the detected value from the O2 sensor 19 and the set reference value.
JP24389787A 1987-09-30 1987-09-30 Air-fuel ratio control device for internal combustion engine Pending JPS6487846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24389787A JPS6487846A (en) 1987-09-30 1987-09-30 Air-fuel ratio control device for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24389787A JPS6487846A (en) 1987-09-30 1987-09-30 Air-fuel ratio control device for internal combustion engine

Publications (1)

Publication Number Publication Date
JPS6487846A true JPS6487846A (en) 1989-03-31

Family

ID=17110625

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24389787A Pending JPS6487846A (en) 1987-09-30 1987-09-30 Air-fuel ratio control device for internal combustion engine

Country Status (1)

Country Link
JP (1) JPS6487846A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02294535A (en) * 1989-05-09 1990-12-05 Mitsubishi Motors Corp Air-fuel ratio control method for internal combustion engine
JP2010138791A (en) * 2008-12-11 2010-06-24 Daihatsu Motor Co Ltd Air-fuel ratio control device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5776448A (en) * 1980-10-31 1982-05-13 Toyota Motor Corp Oxygen sensor element
JPS60173334A (en) * 1984-02-15 1985-09-06 Honda Motor Co Ltd Air-fuel ratio control device of internal-combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5776448A (en) * 1980-10-31 1982-05-13 Toyota Motor Corp Oxygen sensor element
JPS60173334A (en) * 1984-02-15 1985-09-06 Honda Motor Co Ltd Air-fuel ratio control device of internal-combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02294535A (en) * 1989-05-09 1990-12-05 Mitsubishi Motors Corp Air-fuel ratio control method for internal combustion engine
JP2010138791A (en) * 2008-12-11 2010-06-24 Daihatsu Motor Co Ltd Air-fuel ratio control device

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