| 摘要 |
In an apparatus, an abnormality determining circuit determines whether a crank signal is abnormal, and a switching circuit switches an input signal to an edge interval measuring circuit from the crank signal to a cam signal when it is determined that the crank signal is abnormal. The edge interval measuring circuit measures an edge interval of temporally adjacent same-directed edges of the cam signal. A count-value control circuit identifies angular positions of a crankshaft based on the cam signal to initialize a count value of a count unit based on the identified angular positions of the crankshaft. The count-value control unit circuit changes an integral number based on a predetermined waveform pattern of the cam signal to shift the count value of the count unit as in the case of the crank signal inputting to the edge interval measuring circuit.
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