Measuring and testing – Gas analysis – By vibration
Patent
1983-03-22
1985-11-19
Myracle, Jerry W.
Measuring and testing
Gas analysis
By vibration
73119A, G01N 2704
Patent
active
045534241
ABSTRACT:
A method for detecting the oxygen concentration of a gas to be measured is disclosed using the limiting current type oxygen sensor. The method is characterized in that the relationship of an inclined straight line between the voltages applied to the oxygen sensor and the currents outputted therefrom is determined in such a manner that the inclined straight line may pass through the flat portions of the limiting current in the voltage-current characteristics curves at the different oxygen concentrations. The relationship between the outputted currents and the oxygen concentrations at the flat portion is such that when a given magnitude of voltage is applied to the oxygen sensor to cause it to output a current, a voltage which corresponds to this current at the inclined straight line is determined. The voltage thus determined is applied to the oxygen sensor to cause it to output a current. The oxygen concentration is determined from the current thus outputted with reference to the outputted current-oxygen concentration conversion straight line. There is also disclosed a method for controlling the air-to-fuel ratio of a gas from an engine using the above voltage-current characteristic curves, inclined straight line and outputted current-oxygen concentration.
REFERENCES:
patent: 4149120 (1979-04-01), Richter
patent: 4244918 (1981-01-01), Yasuda et al.
Kamo Takashi
Kimura Shirou
Sakurai Shigenori
Myracle Jerry W.
Toyota Jidosha & Kabushiki Kaisha
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