| 摘要 |
A plurality of individual fuel cells are connected in series with each other to construct the fuel cell. The fuel cell is diagnosed on the basis of an average output voltage Va of the individual cells, their standard deviation sigma, individual output voltages, their variances sigma<2 >of vibration components and their voltage drop speed of their non-vibration components. For example, if Va is within a normal range and moreover at least one of the individual output voltages is not within a normal range, it is diagnosed that water blocks the fuel electrode. If Va is not within a normal range and moreover a is within a normal range, it is diagnosed that the electrolyte film is dried. Further, if Va is not within a normal range and moreover sigma is not within a normal range, it is diagnosed that the fuel (hydrogen) supply is insufficient.
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