Measuring and testing – Gas analysis – Gas chromatography
Patent
1980-08-01
1982-08-17
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
123440, G01N 2712
Patent
active
043443176
ABSTRACT:
An air-fuel ratio detecting system is designed to compensate for the effects of temperature changes on the output resistance of an air-fuel ratio sensor adapted to detect the air-fuel ratio of mixture supplied to an engine from the composition of its exhaust gases so as to vary its electric resistance in accordance with the air-fuel ratio. The system further includes a current control circuit for controlling the current supplied to the air-fuel ratio sensor, an average voltage detecting circuit for detecting a rich air-fuel ratio peak voltage and a lean air-fuel ratio peak voltage and obtaining the intermediate voltage therebetween, a bias control circuit responsive to the value of the intermediate voltage so as to adjust the current control amount of the current control circuit, and a comparator responsive to the junction point voltage and the value of the intermediate voltage so as to generate an air-fuel ratio detection signal. Alternatively, the average value of the rich side peak voltage and the ground voltage or the average value of the lean side peak voltage and the supply voltage may be used as the desired intermediate voltage.
REFERENCES:
patent: 4140085 (1979-02-01), Rabus et al.
patent: 4153023 (1979-05-01), Asano et al.
patent: 4156413 (1979-05-01), Taplin
patent: 4171690 (1979-10-01), Hosaka et al.
patent: 4258563 (1981-03-01), Yasuda et al.
patent: 4266519 (1981-05-01), Norimatsu et al.
Hattori Tadashi
Ueno Yoshiki
Kreitman Stephen A.
Nippon Soken Inc.
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