Stop position estimation apparatus for an internal combustion engine

A stop position control unit (4, 70) of an internal combustion engine (2) is in a vehicle applied (10) of that type in which a function of a motor or a generator to a crank shaft of the engine is coupled, such as an organic vehicle and a hybrid vehicle , A rotational position of a motor generator (3) by a motor angle sensor (3a) is detected, or the like, and a crank angle of the engine is detected by a crank angle sensor (90) or the like. A stop position of the internal combustion engine, that is, a crank angle during the stoppage, is estimated based on the rotational position of the motor generator and the crank angle. Using two detection results, the stop position of the internal combustion engine can be accurately estimated. By detecting a direction of rotation of the crankshaft (46) from the output of the motor angle sensor, the stop position of the engine can be accurately estimated, even if the engine is rotated in the reverse direction during the stopping of the engine.