JPS54139796A - Detector of air to fuel ratios - Google Patents

Detector of air to fuel ratios

Info

Publication number
JPS54139796A
JPS54139796A JP4820478A JP4820478A JPS54139796A JP S54139796 A JPS54139796 A JP S54139796A JP 4820478 A JP4820478 A JP 4820478A JP 4820478 A JP4820478 A JP 4820478A JP S54139796 A JPS54139796 A JP S54139796A
Authority
JP
Japan
Prior art keywords
air
fuel ratio
voltage
sensor
amplifier
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
JP4820478A
Other languages
Japanese (ja)
Inventor
Akio Kobayashi
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.)
Denso Corp
Original Assignee
NipponDenso 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 NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Priority to JP4820478A priority Critical patent/JPS54139796A/en
Publication of JPS54139796A publication Critical patent/JPS54139796A/en
Pending legal-status Critical Current

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: To make possible good detection of air to fuel ratios without depending upon operating temperatures and aging by controlling the bias current of an air-to-fuel ratio sensor, comparing the terminal voltage of the sensor and the reference voltage determined from the air-to-fuel ratio and outputting the air-to-fuel ratio detecting signal from a comparator.
CONSTITUTION: An air-to-fuel ratio sensor 20 is supplied with bias current Ib via resistance 40, Tr 45 and its terminal voltage Vt is amplified to A times by a buffer amplifier 33 and is then inputted to the OP amplifier 36 of an integrator. A reference voltage Vs is also inputted to the amplifier 36. The integrator integrates the output voltage AVt of the amplifier 33, i.e., compares the same with the reference voltage Vs and the integrated voltage Vi is so controlled as to become Vs. A control circuit 21 supplies the current Ib proportional to the voltage Vi of the integrator and the mean value of its terminal voltage Vt is controlled irrespective of the overall fluctuations of the electric resistance of the sensor 20 owing to operating temperatures or aging. Hence, the air-to-fuel ratio detection is well accomplished despite any change in the electric resistance value characteristics of the sensor 20 owing to its operating temperatures and aging.
COPYRIGHT: (C)1979,JPO&Japio
JP4820478A 1978-04-21 1978-04-21 Detector of air to fuel ratios Pending JPS54139796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4820478A JPS54139796A (en) 1978-04-21 1978-04-21 Detector of air to fuel ratios

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4820478A JPS54139796A (en) 1978-04-21 1978-04-21 Detector of air to fuel ratios

Publications (1)

Publication Number Publication Date
JPS54139796A true JPS54139796A (en) 1979-10-30

Family

ID=12796845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4820478A Pending JPS54139796A (en) 1978-04-21 1978-04-21 Detector of air to fuel ratios

Country Status (1)

Country Link
JP (1) JPS54139796A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5522250A (en) * 1995-04-06 1996-06-04 Ford Motor Company Aged exhaust gas oxygen sensor simulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5522250A (en) * 1995-04-06 1996-06-04 Ford Motor Company Aged exhaust gas oxygen sensor simulator

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