Patent ID: 7902798
Filing Date: 2011-03-08
Classification: H02P

Abstract:
1. An electric power generation control apparatus for a vehicle alternator, comprising: an exciting current control unit configured to control an exciting current, which flows in an exciting coil of a vehicle alternator which is driven by an internal combustion engine, generates an electric power, and supplies the electric power to a storage battery; an exciting current detection unit configured to detect the exciting current; a rotation speed detection unit configured to detect a rotation speed of the engine or the vehicle alternator; an output voltage detection unit configured to detect an output voltage of the vehicle alternator; and a hunting suppression control unit configured to judge one of whether or not the rotation speed is within an idling rotation speed range and whether or not a periodic change of the rotation speed is not less than a predetermined value, and configured to perform an output voltage decreasing control for decreasing the output voltage of the vehicle alternator by a predetermined voltage value in order to suppress a hunting phenomenon of the vehicle alternator when the judgment result indicates that the rotation speed is within the idling rotation speed range or the periodic change of the rotation speed is not less than the predetermined value, wherein when the judgment result indicates that the rotation speed is within the idling rotation speed range or the periodic change of the rotation speed is not less than the predetermined value, the hunting suppression control unit performs the output voltage decreasing control so that the output voltage of the vehicle alternator is equal to a target adjustment voltage which is larger than an opening voltage of the storage battery and lower than a reference output voltage which is determined in advance corresponding to a storage battery temperature.