To control drainage of water promptly by carrying out precisely freezing determination and defrosting determination at water storage part when starting a fuel cell system below a freezing point.
A gas liquid separation device 14 of a fuel cell system includes a gas liquid separation part 20 and a water storage part 21 in which liquid water separated at the gas liquid separation part is stored. An capacitance sensor 28 measures the capacitance of the water storage part 21. A controller 17 makes a determination of freezing in the water storage part 21 based on the capacitance measured value of the capacitance sensor 28. The freezing determination threshold to determine the freezing in the water storage part is made an capacitance at a prescribed ice-water ratio to determine freezing in the relations of the capacitance and an ice-water ratio when ice and water exist in parallel between an electrode of the capacitance sensor 28 and a ground electrode (housing 18).
COPYRIGHT: (C)2009,JPO&INPIT
Shinichiro Takemoto
Nobuo Sakazume
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