JPS5739342A - Method and apparatus for detecting gas - Google Patents

Method and apparatus for detecting gas

Info

Publication number
JPS5739342A
JPS5739342A JP11513980A JP11513980A JPS5739342A JP S5739342 A JPS5739342 A JP S5739342A JP 11513980 A JP11513980 A JP 11513980A JP 11513980 A JP11513980 A JP 11513980A JP S5739342 A JPS5739342 A JP S5739342A
Authority
JP
Japan
Prior art keywords
excess air
sensor
air ratio
temperature
circuit
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
JP11513980A
Other languages
Japanese (ja)
Other versions
JPS6356939B2 (en
Inventor
Etsuro Yasuda
Minoru Oota
Tomio Kawakami
Susumu Sato
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.)
Soken Inc
Original Assignee
Nippon Soken Inc
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 Nippon Soken Inc filed Critical Nippon Soken Inc
Priority to JP11513980A priority Critical patent/JPS5739342A/en
Publication of JPS5739342A publication Critical patent/JPS5739342A/en
Publication of JPS6356939B2 publication Critical patent/JPS6356939B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
    • G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • 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 make possible control at an optional excess air rate, by inputting a signal of temperature difference obtained from a gas sensor carrying an oxidation catalyst and a temperature sensor, and a stepwise varying signal of electric resistance of the gas sensor, into a comparator. CONSTITUTION:A temperature sensor 1 and a gas sensor 4 are arranged in an exhaust pipe of engine. Each temperature detected by each thermocouple wire 3, 6 of both sensors 1, 4, is nearly the same because the amount of residual oxygen in the exhaust gas is small in reducing atmosphere in which an excess air ratio is smaller than 1. But, when the excess air ratio is drawn near 1, a sudden temperature rise is detected by the wire 6 because the sensor 4 carries a catalyst. A temperature difference signal obtained from both the wires 3, 6 is inputted into an OR circuit 11 and also, a sudden varying signal of electric resistance from the sensor 4 at the time when the excess air ratio is 1 is inputted into the circuit 11. Concentration of the excess air ratio can be detected by the output of the circuit 11.
JP11513980A 1980-08-20 1980-08-20 Method and apparatus for detecting gas Granted JPS5739342A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11513980A JPS5739342A (en) 1980-08-20 1980-08-20 Method and apparatus for detecting gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11513980A JPS5739342A (en) 1980-08-20 1980-08-20 Method and apparatus for detecting gas

Publications (2)

Publication Number Publication Date
JPS5739342A true JPS5739342A (en) 1982-03-04
JPS6356939B2 JPS6356939B2 (en) 1988-11-09

Family

ID=14655245

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11513980A Granted JPS5739342A (en) 1980-08-20 1980-08-20 Method and apparatus for detecting gas

Country Status (1)

Country Link
JP (1) JPS5739342A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001094925A1 (en) * 1998-12-04 2001-12-13 Fujikin Incorporated Gas detection sensor
US6622543B1 (en) 1998-12-04 2003-09-23 Fujikin Incorporated Gas detection sensor
US6883371B2 (en) * 2000-10-10 2005-04-26 Ngk Spark Plug Co., Ltd. Humidity sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001094925A1 (en) * 1998-12-04 2001-12-13 Fujikin Incorporated Gas detection sensor
US6622543B1 (en) 1998-12-04 2003-09-23 Fujikin Incorporated Gas detection sensor
US6883371B2 (en) * 2000-10-10 2005-04-26 Ngk Spark Plug Co., Ltd. Humidity sensor

Also Published As

Publication number Publication date
JPS6356939B2 (en) 1988-11-09

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