Patent ID: 8219248

Claim:
A control device for a cooling fan receiving electric power from a first power storage mechanism to be driven to blow cooling air to cool a second power storage mechanism connected to said first power storage mechanism to supply said first power storage mechanism with electric power via a converter converting voltage, comprising: a voltage sensor detecting a voltage of said first power storage mechanism; and an operation unit that is connected to said voltage sensor and sets a ratio at which a switching element provided between said first power storage mechanism and said cooling fan turns on, in accordance with the voltage of said first power storage mechanism, wherein in addition to setting said ratio in accordance with the voltage of said first power storage mechanism, said operation unit sets said ratio such that a number of revolutions of said cooling fan is larger as a difference between a temperature of said second power storage mechanism and a temperature of the cooling air blown by said cooling fan is smaller, furthermore said operation unit corrects said ratio by feedback control, as based on operational state of said cooling fan, to operate said cooling fan in a predetermined operational state; before charging said first power storage mechanism starts, said operation unit prohibits correcting said ratio by said feedback control; and before charging said first power storage mechanism starts, said operation unit sets a ratio that is lower than said ratio set in accordance with the voltage of said first power storage mechanism.