Patent ID: 8247122

Claim:
A device, for controlling a fuel cell system, the fuel cell system comprising: a fuel cell which generates power using a fuel gas and an oxidizing agent gas serving as materials of the-fuel cell system; and a material supply section which supplies the materials to the fuel cell, the power generated by the fuel cell being extracted to a load, the device comprising: a material flow calculation section configured to calculate a material flow supplied to the fuel cell so as to cause the fuel cell to generate the power of a required power generation amount; a vibration amplitude detection section configured to detect a vibration amplitude of a generated current or a vibration amplitude of a generated voltage, wherein the material flow calculation section makes any of the following operations when the vibration amplitude is higher than or equal to a first predetermined value: maintaining the material flow, and increasing the material flow; a material reduction limit detection section configured to calculate a limit for reducing the material flow supplied to the fuel cell, when the vibration amplitude is lower than the first predetermined value; and a material flow change section configured to control the, material supply section so as to change the material flow calculated by the material flow calculation section to the limit calculated by the material reduction limit detection section.