| 摘要 |
In an air-fuel ratio control apparatus for controlling the air-fuel ratio of an engine in accordance with the output of an O2 sensor, in response to the starting of the engine the output voltage of the O2 sensor is sampled at intervals of a unit time. The slope of the output voltage waveform of the O2 sensor is computed from the successively sampled values. The computed value is compared with a predetermined value indicative of a slope value attained when the O2 sensor is activated and thus it is considered that the O2 sensor is activiated when the computed value is greater than the predetermined value.
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