Patent ID: 8105730

Claim:
A fuel cell system comprising: a fuel cell; a fuel supply flow path which allows a fuel gas supplied from a fuel supply source to flow to the fuel cell; an injector which regulates the state of the gas on the upstream side of this fuel supply flow path to supply the gas to the downstream side; a failure detection device to detect whether the injector has a closure failure; a pressure sensor which detects the pressure value of the fuel gas on the upstream side of the injector; and a determination condition setting device to set, based on the pressure value detected by the pressure sensor, the conditions of determination of the closure failure of the injector, wherein the failure detection device determines, based on the closure failure determination conditions set by the determination condition setting device, whether the injector has the closure failure, and wherein the determination condition setting device sets an energizing time to obtain a current value necessary for the opening of the injector as the closure failure determination condition, and changes the energizing time in accordance with the detected pressure value, when the detected pressure value exceeds a predetermined threshold value.