Honda Giken Kogyo Kabushiki Kaisha

Isao Hyugaji

Takahiro Iwata

Hideki Toyota

A reference amount of consumed energy of a storage battery on an electric-powered vehicle is calculated by adding values of a discharging current of the storage battery which are detected at predetermined time intervals since the storage battery was fully charged. The reference amount of consumed energy is corrected, i.e., multiplied, by consumed-energy corrective coefficients based on the battery temperature, the discharging current, the battery voltage, and the specific gravity of the storage battery, thereby determining an amount of consumed electric energy. A reference amount of remanent stored energy of the storage battery is determined by deducting the determined amount of consumed electric energy from an initial amount of stored energy of the storage battery. The reference amount of remanent stored energy is then corrected, i.e., multiplied, by remanent-energy corrective coefficients based on the ratio of amounts of charged and discharged energy, the number of times that the storage battery has been charged, and the battery temperature.

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Wako, Japan

Isao Hyugaji