Remaining capacity calculating device and method for electric power storage
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorsAtsushi Namba, Mikio Ono
Life of this patent
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Abstract
It calculates a capacity difference ESOC between a reference remaining capacity SOCV based on an open-circuit voltage and a final remaining capacity SOC in a previous one calculation cycle. It calculates a proportional correction amount and an integral correction amount according to a proportional-integral control by using this capacity difference ESOC, and requires a final remaining capacity SOC by adding a remaining capacity SOCI based on a current integration to these correction amounts. Thus, while making good use of the remaining capacity based on the battery open-circuit voltage, it can avoid the influence of the load fluctuation and require a remaining capacity always stable and accurate.
Claims6
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 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 finally calculated 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 the 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.
A remaining capacity calculating method for electric power storage, the method comprising:
- calculating a reference remaining capacity based on an open-circuit voltage;
- calculating a capacity difference between the reference remaining capacity and a remaining capacity finally calculated as a remaining capacity of the electric power storage;
- calculating 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
- calculating the final remaining capacity of the electric power storage, according to the proportional correction amount and the integral correction amount.
Dependencies are inferred from the claim text.