JPS6432044A - Air-fuel ratio controller for engine - Google Patents

Air-fuel ratio controller for engine

Info

Publication number
JPS6432044A
JPS6432044A JP18989287A JP18989287A JPS6432044A JP S6432044 A JPS6432044 A JP S6432044A JP 18989287 A JP18989287 A JP 18989287A JP 18989287 A JP18989287 A JP 18989287A JP S6432044 A JPS6432044 A JP S6432044A
Authority
JP
Japan
Prior art keywords
heater
air
oxygen sensor
fuel ratio
less
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
JP18989287A
Other languages
Japanese (ja)
Inventor
Kanji Ueda
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
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 Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP18989287A priority Critical patent/JPS6432044A/en
Publication of JPS6432044A publication Critical patent/JPS6432044A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To prevent battery overdischarge at the time of cold starting stopping current energization to a heater when temperature of an oxygen sensor is less than the specified value, in case of a device which performs air-fuel ratio feedback control using an oxygen sensor with heater. CONSTITUTION:An ignition signal out of a distributor 36 is inputted into a control unit 24 together with each detected value of an intake air temperature sensor 21, an air flow meter 23, a water temperature sensor 27, an oxygen sensor 29 with a heater, etc., and it heats the oxygen sensor 29 with the heater at the time of low load and low engine speed, making air-fuel ratio feedback possible to be done. That is, the control unit 24 performs a current energization to the heater at a time when water temperature is more than about 20 deg.C, engine speed is less than about 4500r.p.m. or intake air quantity is less than the setting value, not in cranking. When it is in the cranking or the water temperature is lower than about 20 deg.C, the current energization to the heater is stopped.
JP18989287A 1987-07-28 1987-07-28 Air-fuel ratio controller for engine Pending JPS6432044A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18989287A JPS6432044A (en) 1987-07-28 1987-07-28 Air-fuel ratio controller for engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18989287A JPS6432044A (en) 1987-07-28 1987-07-28 Air-fuel ratio controller for engine

Publications (1)

Publication Number Publication Date
JPS6432044A true JPS6432044A (en) 1989-02-02

Family

ID=16248929

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18989287A Pending JPS6432044A (en) 1987-07-28 1987-07-28 Air-fuel ratio controller for engine

Country Status (1)

Country Link
JP (1) JPS6432044A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353774A (en) * 1992-02-20 1994-10-11 Unisia Jecs Corporation Damage preventing method and device for sensor element of air/fuel ratio sensor with heater
JPH0835418A (en) * 1994-07-25 1996-02-06 Nippondenso Co Ltd Temperature controller of exhaust emission control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353774A (en) * 1992-02-20 1994-10-11 Unisia Jecs Corporation Damage preventing method and device for sensor element of air/fuel ratio sensor with heater
JPH0835418A (en) * 1994-07-25 1996-02-06 Nippondenso Co Ltd Temperature controller of exhaust emission control device

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