Patent ID: 8129058

Claim:
A fuel cell system comprising: a hydrogen generator including a reformer which has a reforming catalyst and carries out a reforming reaction using the reforming catalyst to generate a hydrogen-containing gas from a raw material, a shift converter which has a shift catalyst and carries out a shift reaction using the shift catalyst to decrease carbon monoxide in the hydrogen-containing gas, and a first temperature detector which detects a temperature of the shift converter; a fuel cell which uses the hydrogen-containing gas delivered from the hydrogen generator, to generate electric power; a timer; and a control unit including a processor and a memory storing a program, the program, when executed by the processor, causing the processor: not to start delivering the hydrogen-containing gas from the hydrogen generator to the fuel cell when at least the temperature of the shift converter detected by the first temperature detector is not a stable determination temperature or higher; and to acquire an operation stop period of the fuel cell from the timer and change the stable determination temperature by utilizing the acquired operation stop period, wherein: the stable determination temperature being lower than a control temperature of the shift converter at the time of a normal operation, and the operation stop period is an elapsed time period from a stop of a previous operation of the fuel cell system.