Sensor control apparatus and method

Details Sensor control apparatus and method Sensor control apparatus and method

2011-06-14

2011-06-14

Nguyen, Nam X (Department: 1724)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S424000, C204S426000, C204S427000, C073S023310, C073S023320

Reexamination Certificate

active

07959778

ABSTRACT:
A sensor control apparatus comprising an air/fuel ratio sensor having a sensor cell with a pair of electrodes, a current source capable of supplying a predetermined current between the electrodes, a current control section that turns on/off the current source, a voltage detecting section that detects voltages generated between the electrodes at respective times when the current source is turned on and off, a differential voltage detecting section that detects a differential voltage between the voltages that are generated at the respective times when the current source is turned on and off, a first voltage comparing section that compares the differential voltage with a first threshold voltage, and a half-activated state determining section that determines that the sensor cell has reached a half-activated state when the differential voltage is lower than the first threshold voltage. A sensor control method is also provided.

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Non-Final Office Action, dated Jul. 9, 2010 (in U.S. Appl. No. 11/604,218).

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