| 摘要 |
A fuel cell system includes a fuel cell which generates electric energy by electrochemical reactions, an ultrasonic sensor which detects physical information of an aqueous methanol solution to be used for the generation of electric energy by the fuel cell based on an ultrasonic propagation speed in the aqueous methanol solution, a voltage sensor which detects electrochemical information of the aqueous methanol solution based on an open-circuit voltage of the fuel cell, and first and second temperature sensors which detect temperatures of the aqueous methanol solution. The system further includes a CPU which obtains a concentration of the aqueous methanol solution based on the physical information and a concentration of the aqueous methanol solution based on the electrochemical information, and selects one of the concentrations based on the detected temperature. The fuel cell system is capable of detecting a concentration of the aqueous fuel solution easily and accurately.
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