Patent ID: 7977917

Claim:
An electric power supply control system for a vehicle comprising: a battery; electric generation devices; a primary electric power system which is operable on receiving an electric power and generates a rush current on initiating its operation; a secondary electric power system, the operation of which being limited according to demand during the operation of the primary electric power system; and a battery condition management device configured to manage the condition of the battery, comprising: battery monitoring means configured to detect a charging/discharging current of the battery, and obtain discharging characteristics of the battery; allowable electric power calculation means configured to calculate an allowable electric power of the battery with which the battery is dischargeable until a terminal voltage of the battery drops down to a predetermined limit voltage based on the discharging characteristics and discharging current of the battery; and allowable electric power notice means configured to provide a notice of the allowable electric power to the primary electric power system and the secondary electric power system, wherein each of the primary electric power system and the secondary electric power system changes its operation based on the notice of the allowable electric power in order to maintain the terminal voltage of the battery over the limit voltage.