FUEL CELL SYSTEM AND CONTROL METHOD THEREFOR

摘要

This fuel cell system comprises: a fuel cell stack (10); a hydrogen gas supply path (31) connected to the entrance of a hydrogen gas passage (30) formed inside the fuel cell stack; and a hydrogen gas supply valve (35), disposed inside the hydrogen gas supply path, for supplying hydrogen gas to the fuel cell stack intermittently at a predetermined interval, the hydrogen gas supply valve being configured such that the supply flow rate and the supply duration can be modified while maintaining the interval. The system determines whether or not a power generation failure has occurred in the fuel cell stack. When it has been determined that a power generation failure has occurred in the fuel cell stack, the system carries out differential pressure increase control wherein the supply flow rate is increased while the supply duration is shortened, thereby substantially maintaining the amount of fuel gas supplied to the fuel cell stack while increasing the pressure difference between the fuel gas passage entrance and the fuel gas passage exit.