JPS5622944A - Signal processing circuit of o2 sensor using titania - Google Patents

Signal processing circuit of o2 sensor using titania

Info

Publication number
JPS5622944A
JPS5622944A JP9888179A JP9888179A JPS5622944A JP S5622944 A JPS5622944 A JP S5622944A JP 9888179 A JP9888179 A JP 9888179A JP 9888179 A JP9888179 A JP 9888179A JP S5622944 A JPS5622944 A JP S5622944A
Authority
JP
Japan
Prior art keywords
voltage
output
sensor
circuit
converts
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
JP9888179A
Other languages
Japanese (ja)
Other versions
JPS6219700B2 (en
Inventor
Hiroshi Iwamoto
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 Ten Ltd
Original Assignee
Denso Ten 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 Denso Ten Ltd filed Critical Denso Ten Ltd
Priority to JP9888179A priority Critical patent/JPS5622944A/en
Publication of JPS5622944A publication Critical patent/JPS5622944A/en
Publication of JPS6219700B2 publication Critical patent/JPS6219700B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE: To improve the practicality of air fuel ratio control by a sensor by providing a logarithmic conversion part that converts the resistance value change of the sensor into a linear voltage change and then by comparing the output to a mean output found from the maximum and minimum values.
CONSTITUTION: To O2 sensor Rθ using titania, silicon diode D1 is connected in series to constitute logarithmic conversion part 1. Its output V1 pulsates under feedback control over an air fuel ratio and varies in DC component with exhaust gas temperature varying according to aging, so it is amplified by differential amplifier OP1 to obtain output V2. The voltage-dividing circuit composed of resistances R3 and R4 converts this voltage V2 into voltage V3, which is led to minimum-value detecting circuit 2 and the voltage-dividing circuit composed of resistances R5 and R6 converts it into voltage V5, which is led to maximum-value detecting circuit 3. Circuit 2 limits the voltage of capacitor C1 with the minimum output of amplifier OP2 to hold voltage V4, and circuit 3 holds maximum value V6 by capacitor C2. From those voltages V4 and V6, mean value V7 is calculated and used as the reference voltage of comparing circuit OP4 and in accordance with the comparison to voltage V2, a rich-lean decision is made.
COPYRIGHT: (C)1981,JPO&Japio
JP9888179A 1979-08-02 1979-08-02 Signal processing circuit of o2 sensor using titania Granted JPS5622944A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9888179A JPS5622944A (en) 1979-08-02 1979-08-02 Signal processing circuit of o2 sensor using titania

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9888179A JPS5622944A (en) 1979-08-02 1979-08-02 Signal processing circuit of o2 sensor using titania

Publications (2)

Publication Number Publication Date
JPS5622944A true JPS5622944A (en) 1981-03-04
JPS6219700B2 JPS6219700B2 (en) 1987-04-30

Family

ID=14231490

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9888179A Granted JPS5622944A (en) 1979-08-02 1979-08-02 Signal processing circuit of o2 sensor using titania

Country Status (1)

Country Link
JP (1) JPS5622944A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60202344A (en) * 1984-03-27 1985-10-12 Yanmar Diesel Engine Co Ltd Exhaust air detector
JP2006252499A (en) * 2005-03-11 2006-09-21 Figla Co Ltd Crime/disaster prevention system
CN103575770A (en) * 2012-07-26 2014-02-12 森斯瑞股份公司 Method for operating a portable electronic device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60202344A (en) * 1984-03-27 1985-10-12 Yanmar Diesel Engine Co Ltd Exhaust air detector
JPH0417373B2 (en) * 1984-03-27 1992-03-25 Yanmar Diesel Engine Co
JP2006252499A (en) * 2005-03-11 2006-09-21 Figla Co Ltd Crime/disaster prevention system
CN103575770A (en) * 2012-07-26 2014-02-12 森斯瑞股份公司 Method for operating a portable electronic device

Also Published As

Publication number Publication date
JPS6219700B2 (en) 1987-04-30

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