JPS6483835A - Air-fuel controller for internal combustion engine - Google Patents

Air-fuel controller for internal combustion engine

Info

Publication number
JPS6483835A
JPS6483835A JP62238958A JP23895887A JPS6483835A JP S6483835 A JPS6483835 A JP S6483835A JP 62238958 A JP62238958 A JP 62238958A JP 23895887 A JP23895887 A JP 23895887A JP S6483835 A JPS6483835 A JP S6483835A
Authority
JP
Japan
Prior art keywords
fuel
air
feedback control
layer
oxygen sensor
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.)
Granted
Application number
JP62238958A
Other languages
Japanese (ja)
Other versions
JPH0786333B2 (en
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 JP62238958A priority Critical patent/JPH0786333B2/en
Publication of JPS6483835A publication Critical patent/JPS6483835A/en
Publication of JPH0786333B2 publication Critical patent/JPH0786333B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Measuring Oxygen Concentration In Cells (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE:To reduce CO, HC and NOx discharges by setting a feedback control constant in the fuel decrement direction to be a relatively large value, in a device which controls an air-fuel ratio on the basis of output of an oxygen sensor with a NOx reducing catalyzer. CONSTITUTION:In an exhaust passage 12 of an internal combustion engine 11, there is provided with an oxygen sensor 19 which detects an air-fuel ratio of mixture after detecting exhaust oxygen content, while three-way catalyst 20 is installed at the downstream side. As for the oxygen 19, such a structural one that installs a platinum catylic layer (catalytic oxidation layer) 4, a NOx reducing catalytic layer 5 and a protective layer 6 successively on an outer surface of a ceramic tube 1 installing each of electrodes 2, 3 on both inner and outer surface is used. A fuel injection valve 5 is controlled by a control unit 16 on the basis of output of the oxygen sensor 19, and when air-fuel feedback control takes place, a feedback control constant in the fuel decrement direction is made larger than the feedback control constant in the fuel increment direction.
JP62238958A 1987-09-25 1987-09-25 Air-fuel ratio controller for internal combustion engine Expired - Lifetime JPH0786333B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62238958A JPH0786333B2 (en) 1987-09-25 1987-09-25 Air-fuel ratio controller for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62238958A JPH0786333B2 (en) 1987-09-25 1987-09-25 Air-fuel ratio controller for internal combustion engine

Publications (2)

Publication Number Publication Date
JPS6483835A true JPS6483835A (en) 1989-03-29
JPH0786333B2 JPH0786333B2 (en) 1995-09-20

Family

ID=17037827

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62238958A Expired - Lifetime JPH0786333B2 (en) 1987-09-25 1987-09-25 Air-fuel ratio controller for internal combustion engine

Country Status (1)

Country Link
JP (1) JPH0786333B2 (en)

Also Published As

Publication number Publication date
JPH0786333B2 (en) 1995-09-20

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