| 摘要 |
In an exhaust gas sensor control device that outputs a detection signal detected by the exhaust-gas sensor, while switching amplification factors or offset voltages, in the case where an abnormality occurs in an amplification circuit or in an offset circuit, the abnormality is rapidly detected, whereby deterioration in an exhaust gas can be prevented. In an internal-combustion-engine control apparatus provided with an exhaust gas sensor control device that outputs a detection signal detected by an exhaust-gas sensor 100, while switching amplification factors of an amplification circuit 125 or offset voltages of an offset circuit 126, it is determined whether the exhaust-gas sensor 100 is in an activation state or in a non-activation state, and an electric current flowing into the exhaust-gas sensor 100 is stopped, in the case where it is determined that the exhaust-gas sensor 100 is in a non-activation state; the amplification factors of the amplification circuit 125 are switched so that there is detected an air-fuel ratio signal at the time when an electric current flowing into the exhaust-gas sensor 100 is stopped, and it is determined whether or not the offset circuit 126 is abnormal, based on whether or not the respective air-fuel ratio signals at the amplification factors are within a predetermined range.
|
