| 摘要 |
A control unit 20 calculates a required output of an inverter 44 from an input accelerator travel (step S12). The control unit 20 specifies an output electric current-output voltage characteristic corresponding to a gas flow rate, obtains a point of highest energy conversion efficiency on the specified characteristic to specify the point as a working point of fuel cells 36, and computes an output electric power of the fuel cells 36 at the specified working point (steps S16 through S20). The control unit 20 determines an output voltage required to a battery 40, based on a difference between the calculated required output of the inverter and the computed output electric power of the fuel cells and an SOC of the battery 40 (step S24). The control unit 20 controls a DC-DC converter 38 and regulates the output voltage of the DC-DC converter 38, so as to cause the battery 40 to generate the output voltage thus determined (step S28). The control unit 20 subsequently controls the inverter 44, so as to cause a motor 46 to consume electric power corresponding to the required output (step S30). This arrangement enables the fuel cells 36 to be activated at the working point of high energy conversion efficiency. <IMAGE> |
