Internal combustion engine control apparatus

An internal combustion engine control apparatus for identifying a plurality of cylinders of an internal combustion engine to control the injection of fuel and ignition timing with respect to each of said cylinders, said apparatus comprising:

• crank angle position signal generation means mounted on a crankshaft of said internal combustion engine for generating a crank angle position signal in the form of a train of a plurality of pulses corresponding to a plurality of rotational angle positions of said crankshaft;
• cylinder identification signal generation means mounted on a camshaft that rotates at a rate of one revolution per two revolutions of said crankshaft for generating a cylinder identification signal in the form of a train of a plurality of pulses corresponding to a plurality of rotational angle positions of said camshaft, and to said cylinders;
• reference crank angle position detection means for detecting reference crank angle positions included in said crank angle position signal;
• cylinder identification means for identifying each of said cylinders based on said cylinder identification signal;
• cylinder control means for generating a fuel injection signal and an ignition signal with respect to each of said cylinders based on the result of cylinder identification performed by said cylinder identification means and the crank angle position of said crank angle position signal;
• and
• abnormality determination means for determining the presence or absence of abnormality at least in said crank angle position signal;
• wherein said cylinder identification means comprises cylinder identification resetting means for resetting the current cylinder identification content of said cylinder identification means when it is determined that said crank angle position signal is abnormal;
• and
• said cylinder identification resetting means comprises:
• fuel injection and ignition signal stopping means for stopping said fuel injection signal and said ignition signal;
• and
• cylinder identification information clearing means for clearing previous cylinder identification information earlier than the last crank angle position signal at the time of the determination of abnormality.