| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel cell system which heats the inside of the fuel cell stack by the heat accompanying power generation by suppressing excessive temperature rise at the time of starting a fuel cell stack in the environment below freezing point. <P>SOLUTION: The cooling control means provided in a controller of a fuel cell system, when the temperature Twin of a coolant in the vicinity of the entrance of a fuel cell stack in the coolant passage is 0°C or less in Step 1, carries out a "coolant intermittent circulation process" in which a "cooling stop cycle" for stopping circulation of the coolant in the coolant passage by stopping a cooling pump in Step 9 until the Twin exceeds 0°C in Step 8, and a "cooling execution cycle" for circulating the coolant in the cooling passage by operating the cooling pump in Step 11 when a prescribed time has passed in Step 10, are alternately carried out repeatedly. When in the Step 7 of the "cooling execution cycle", the internal temperature Tse of the fuel cell stack has exceeded the guaranty temperature of the fuel cell stack, the cooling control means proceeds to Step 30 and stops the "cooling intermittent circulation process" and circulates the coolant continuously. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
