Patent ID: 7362076
Filing Date: 2008-04-22
Classification: G01R

Abstract:
1. A remaining capacity calculating device for electric power storage, the device comprising: a reference remaining capacity calculating unit that calculates a remaining capacity based on an open-circuit voltage of an electric power storage as a reference remaining capacity; a current integration remaining capacity calculating unit that calculates a remaining capacity based on a current integration of the electric power storage as a remaining capacity based on the current integration; a capacity difference calculating unit that calculates a capacity difference between the reference remaining capacity calculated by the reference remaining capacity calculating unit and a remaining capacity calculated in a previous cycle as a remaining capacity of the electric power storage; a proportional-integral controlling unit that calculates a proportional correction amount and an integral correction amount of a proportional-integral control with the reference remaining capacity as a target value, according to the capacity difference; and a remaining capacity calculating unit that calculates a final remaining capacity of the electric power storage, according to the proportional correction amount and the integral correction amount calculated by the proportional-integral controlling unit, and the remaining capacity based on the current integration, wherein the proportional-integral controlling unit calculates the proportional correction amount in association with a proportional coefficient of the proportional-integral control based on a current change rate of charge/discharge currents of the electric power storage and the temperature of the electric power storage.