| 摘要 |
An apparatus for controlling operation of an internal combustion engine on the basis of a plurality of cylinder identification signals and a reference position signal includes a control means for making it possible to continue the engine operation control even when one of the above signals suffers from abnormality. The control means includes a first decision means for making decision as to whether or not the individual cylinder identification signals are normal, and a first back-up means for controlling the engine on the basis of other cylinder identification signal(s) when one of said cylinder identification signals is decided to be not normal. The control means may include in addition to the first decision means and the first back-up means a second decision means for making decision as to whether the reference signal is normal or not, and a second back-up means responsive to an output of the second first decision means indicating that the reference position signal is not normal, to thereby control operation of the engine on the basis of the cylinder identification signals.
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