Patent ID: 8917058

Claim:
A battery charging control system comprising: an alternator that operates utilizing kinetic energy of a motor or a wheel of a vehicle and has a variable generation voltage; a plurality of batteries having different charging voltages; first calculation unit for calculating maximum generation power defined as the highest generation power that said alternator can generate at a charging voltage suitable for each battery, using the rotation speed of said alternator as a parameter; second calculation unit for calculating maximum charging power defined as the highest charging power that each battery can accept, using the state of charge of each battery as a parameter; obtaining unit for obtaining chargeable power defined as power that can be supplied to each battery from said alternator by comparing said maximum generation power and said maximum charging power; selection unit for selecting a battery for which the chargeable power obtained by said obtaining unit is highest among said plurality of batteries; and control unit for controlling said alternator in such a way that the battery selected by said selection unit is charged.