| 摘要 |
A degradation detector of an exhaust gas sensor is disclosed. The detector comprises a first heater resistance estimator ( 16 ) for estimating a resistance of a heater that heats the exhaust gas sensor, based on a device resistance of the exhaust gas sensor; a heater resistance calculator ( 17 ) for calculating a resistance of the heater, based on a heater current of the heater; and a degradation determiner ( 18 ) for determining whether the exhaust gas sensor is degraded, by comparing the estimated resistance of the heater and the calculated resistance of the heater.
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