| 摘要 |
A method for controlling a residual battery capacity of a secondary battery, by which the precision of the energy management of the system can be improved substantially, is provided. A current flowing through the battery is detected and the detected current is multiplied by a predetermined charge efficiency so that an operation on a residual battery capacity is performed at least by current integration (S201), an output voltage from the battery is detected and an average of the output voltages detected for a predetermined time period is calculated (S202), an average of the residual battery capacities obtained by the operation for a predetermined time period is calculated (S203), a reference voltage corresponding to the calculated average of residual battery capacities is referred to (S204), the reference voltage and the average voltage is compared (S205), and the predetermined charge efficiency is set variably based on a result of the comparison (S206).
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