Controller for gas concentration sensor

Details Controller for gas concentration sensor Controller for gas concentration sensor

2011-03-22

2011-03-22

Olsen, Kaj K (Department: 1724)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S425000, C205S785000

Reexamination Certificate

active

07909970

ABSTRACT:
An oxygen sensor is employed for determining whether the exhaust air-fuel ratio is rich or lean. A voltage is applied to the oxygen sensor at device impedance calculation intervals to calculate device impedance. After device impedance calculation, a reverse voltage is applied to the oxygen sensor with a view toward promptly negating the influence of voltage application on the sensor output. Subsequently, the sensor output of the oxygen sensor is sampled at sampling time intervals until it is concluded that the device impedance calculation period is over.

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Notice of Allowance issued in U.S. Appl. No. 12/005,266 on Sep. 16, 2010.

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