Method and apparatus for gas concentration detection and manufac

Details Method and apparatus for gas concentration detection and manufac Method and apparatus for gas concentration detection and manufac

1998-04-22

1999-11-09

Warden, Sr., Robert J.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

2057845, 73 106, G01N 2726

Patent

active

059807105

ABSTRACT:
An A/F sensor generates a current signal corresponding to an air-fuel ratio in response to a voltage applied by a bias control circuit. After a sensor current is received as a voltage signal via a voltage follower, it is outputted to an A/D converter having a predetermined input voltage range, 0 to 5V. A sensor current detection circuit has a plurality of current detection resistors. In order to variably set the resistance value by the sensor current detection circuit, a switch circuit is switched in accordance with the sensor current depending on whether the A/F value to be detected is in the zone near the stoichiometric ratio or in other air-fuel ratio zones.

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