Patent ID: 8078417

Claim:
An apparatus controlling charging and discharging a rechargeable power storage device mounted in a vehicle, comprising: means for obtaining outside air temperature representing a temperature outside said vehicle; means for obtaining estimated power storage temperature based on said outside air temperature obtained by said means for obtaining outside air temperature, said estimated power storage temperature representing an estimated value of a temperature that said power storage device has when an ignition-on command is received to restart a vehicular system, said means for obtaining estimated power storage temperature having said estimated power storage temperature stored therein in association with said outside air temperature; means for obtaining actual power storage temperature representing an actual value of a temperature of said power storage device; and means for learning, updating a relationship between said outside air temperature and said estimated power storage temperature in said means for obtaining estimated power storage temperature, as based on an error between said estimated power storage temperature previously obtained by said means for obtaining estimated power storage temperature and said actual power storage temperature obtained when said ignition-on command is received.