Patent ID: 8763581

Claim:
An internal combustion engine automatic-stop/restart control system comprising: a crank angle detection unit that outputs a crank angle signal corresponding to a crank angle of an internal combustion engine; a reference signal output unit that outputs a reference signal in the crank angle signal when the crank angle signal is situated in a predetermined position; a reference signal detection unit that detects a reference signal; a piston position determination unit that determines piston positions of a plurality of cylinders, based on reference signals in the crank angle signal; an internal combustion engine automatic-stop/restart unit; a starter motor that is energized to rotate; a pinion gear provided on the rotation axle of the starter motor; a plunger for pushing the pinion gear in the axis direction of the rotation axle so that the pinion gear engages with a ring gear provided on a crankshaft of the internal combustion engine; and a solenoid that is energized to move the plunger in the axis direction of the rotation axle, wherein: the internal combustion engine is controlled in such a way that, while the internal combustion engine inertially rotates after its automatic stop, the solenoid of a starting apparatus for starting the internal combustion engine is driven so that the pinion gear is moved in the axis direction and pushing the pinion gear against the ring gear is started, and detection of the reference signal through the crank angle signal is prohibited until a predetermined period elapses after the pushing has been started.