| 摘要 |
The IR resistance of each unit cell 2 is measured (step S14), and a highe st unit cell voltage as a threshold voltage is set based on the IR resistanc e and the load current (step S18). The setting of the highest unit cell volt age uses map data that approximates current-voltage characteristics of a uni t cell when the fuel gas is insufficiently supplied. In that case, the highe st unit cell voltage is determined based on the voltage with respect to the load current obtained from the map data, and the IR loss calculated from the IR resistance and the load current. This highest unit cell voltage is compa red with the measured unit cell voltage (step S22). If the unit cell voltage is below the highest unit cell voltage, the power generation of the fuel ce ll is stopped or restrained (step S24). |
