Patent ID: 7943262

Claim:
A fuel cell system, comprising: a fuel cell; a feed channel through which oxidizing gas to be fed to the fuel cell flows; a feed device provided in the feed channel to feed the oxidizing gas under pressure to the fuel cell; a discharge channel through which oxidizing off gas discharged from the fuel cell flows; a bypass channel which connects the feed channel to the discharge channel so that the oxidizing gas flows while bypassing the fuel cell; a split flow adjustment device that is configured to adjust a split flow of the oxidizing gas to the bypass channel and the fuel cell; and a controller which controls the feed device and the split flow adjustment device, wherein the controller is configured to switch a control of the output current of the fuel cell from a control by the split flow adjustment device to a control by the feed device, when the split flow adjustment device has an error during a low efficiency operation having a power loss larger than that of a normal operation.