Measuring and testing – Gas analysis – Gas of combustion
Patent
1993-05-28
1994-06-28
Williams, Hezron E.
Measuring and testing
Gas analysis
Gas of combustion
123694, G01N 27419
Patent
active
053236351
ABSTRACT:
An air fuel ratio detecting arrangement using a diffusion suppressing type air fuel ratio sensor applicable to an air fuel ratio control unit for an internal combustion engine incorporating an atmospheric air pressure correction circuit in a signal processing and outputting device for correcting an output voltage signal processed therein based on a change in atmospheric air pressure which is detected when a predetermined operating condition of an internal combustion engine is satisfied. A secular change correction circuit included in the signal processing and outputting device detects a change in electromotive force of a concentration cell portion of the air fuel ratio sensor when a predetermined rich air fuel ratio is reached and corrects a reference voltage for the air fuel ratio sensor based on the detected change in electromotive force of the concentration cell portion in addition to an air calibration circuit.
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Hasegawa Norio
Minami Naoki
Ouchi Shiro
Sasayama Takao
Sato Kanemasa
Hitachi , Ltd.
Hitachi Automotive Engineering Co. Ltd.
Roskos Joseph W.
Williams Hezron E.
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