Measuring and testing – Gas analysis – Gas chromatography
Patent
1979-12-05
1981-12-22
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
123440, G01N 2712
Patent
active
043064442
ABSTRACT:
An air-fuel ratio detecting system having a resistor device in series with an oxygen detector element with the electrical resistance thereof changing with the oxygen component of the exhaust gas from an automobile engine, wherein a constant voltage is applied to the series circuit, and by means of the voltage at the junction point of the oxygen detector element and the resistor device the air-fuel ratio of the mixture is detected. The system comprises a sample circuit which detects the voltage at the junction point of the oxygen detector element and the resistor device when the air-fuel ratio is at a predetermined value on either rich or lean side, and a comparator which compares the output of the sample circuit with a predetermined reference voltage, wherein the resistance value of the variable resistors is changed in accordance with the result of comparison, and erroneous detection of the oxygen concentration is prevented even when the resistance characteristic of the air-fuel ratio sensor changes by the change of the working temperature or by lapse of time.
REFERENCES:
patent: 4112893 (1978-09-01), Anzai
patent: 4237839 (1980-12-01), Ueno et al.
Hattori Tadashi
Ueno Yoshiki
Kreitman Stephen A.
Nippon Soken Inc.
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