| 摘要 |
A fuel cell system is capable of easily detecting an abnormality in an aqueous solution container, a circulation unit or a liquid level adjusting unit. The fuel cell system includes an aqueous solution tank which holds aqueous methanol solution; a level sensor which outputs one of detection signals HIGH and LOW in accordance with the liquid level in the aqueous solution tank; an aqueous solution pump for circularly supplying aqueous methanol solution to a cell stack; a water pump for supplying water to the aqueous solution tank; and a CPU which controls operation of the fuel cell system. The CPU detects that an abnormality exists based on comparison between a first predetermined time and a required time (LOW time) which is a time required for a detection signal to be changed from LOW to HIGH, or on comparison between a second predetermined time and a required time (HIGH time) which is a time required for the detection signal to be changed from HIGH to LOW.
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