the engine after the engine is started the acg starter 1 functions as a synchronous motor charges the battery with current generated thereby and besides supplies current to various electric accessory elements referring back to fig2 a sprocket wheel 231 is secured to the crankshaft 201 between the acg starter 1 and a bearing 209 and a chain for driving a camshaft not shown from the crankshaft 201 is wrapped around the sprocket wheel 231 it is to be noted that the sprocket wheel 231 is formed integrally with a gear wheel 232 for transmitting power to a pump for circulating lubricating oil fig4 is a block diagram of principal elements of an electric accessory system including the acg starter 1 an ecu 80 includes a full wave rectification bridge circuit 81 for full wave rectifying three phase ac current generated by the acg starter 1 a regulator 82 for limiting an output of the full wave rectification bridge circuit 81 to a predetermined regulated voltage for example 14 5 v and a stop amp go control section 84 for automatically stopping the engine when the vehicle stops and automatically re starting the engine when predetermined starting conditions are satisfied the ecu 80 also includes a starting reverse rotation control section 85 for rotating upon starting of the engine by a starter switch 35 the crankshaft 201 reversely to a predetermined position and then rotating the engine forwardly a stopping reverse rotation control section 86 for rotating the crankshaft 201 to a predetermined position after the engine is automatically stopped by the stop amp go control and an ignition suppression control section 87 for causing the engine to misfire.