Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Satoshi Hada0
Tomoo Kawase0
Eiichi Kurokawa0
Date of Patent
November 4, 2008
0Patent Application Number
108134420
Date Filed
March 31, 2004
0Patent Primary Examiner
Patent abstract
In a gas concentration detecting apparatus, a voltage is applied to electrodes of a sensor element. A change is caused in either the applied voltage or an element current. An amount of a change in each of a current value and a voltage value caused is measured in response to the caused change. An amount of resistance of the sensor element is calculated based on a ratio between the change amounts in the current value and the voltage value. A detection unit detects abnormality relating to controlling the sensor by utilizing at least one of the change amounts in the current value and the voltage value.
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