| 摘要 |
PROBLEM TO BE SOLVED: To provide an oxygen content sensor input device for determining the disconnection of an oxygen content sensor and its relevant wiring with a simple constitution while increasing the detection resolution and supplying, with the simple constitution, additional current required by the oxygen content sensor in which the band of the detection operation region is widened.SOLUTION: This oxygen content sensor input device includes a sensor input circuit 1 that freely supplies flowing current to the oxygen content sensor 2 which detects the oxygen content in exhaust gas from an internal combustion engine. The sensor input circuit includes an operational amplifier 12 which forms a voltage floor, and a current value of the flowing current is set such that a voltage waveform of a detection signal of the oxygen content sensor goes over a lower voltage limit of a detection threshold. |
