Fuel cell system

A fuel cell system comprising:

• a fuel cell;
• an injection device configured to inject anode gas;
• an ejector mechanism through which the anode gas injected from the injection device flows;
• a circulation path configured to return the anode gas, discharged from the fuel cell, to the ejector mechanism;
• a supply path configured to supply the anode gas, discharged from the fuel cell together with the anode gas injected from the injection device from the ejector mechanism, to the fuel cell;
• and
• a controller configured to control the injection device to perform a pulsating operation in which a pressure-increasing period and a pressure-decreasing period are alternately repeated such that a pressure of the anode gas to be supplied to the fuel cell pulsates within a predetermined range, the pressure-increasing period being in which the pressure increases, the pressure-decreasing period being in which the pressure decreases,
• wherein the controller is configured to control the injection device to inject an amount of the anode gas larger than a consumption amount of the anode gas consumed by the fuel cell in the pressure-increasing period, and to control the injection device to inject an amount of the anode gas smaller than the consumption amount in the pressure-decreasing period.