Device for detecting resistance of air fuel ratio sensor in motor vehicle

摘要

The device has a gas state detector for detecting the state of an object gas detected by an oxygen concentration sensor (101). A sensor detects an impedance of the oxygen concentration sensor by applying a voltage to the oxygen sensor. A device corrects the detected impedance in accordance with the gas state. Alternatively, the correction device may correct the detected impedance according to the quantity of energy fed through a heating device (104).