Fuel cell system

A fuel cell system comprising:

• a fuel cell stack configured to generate electric power using an oxygen-containing gas and a fuel gas;
• a supply passage through which the oxygen-containing gas to be supplied to the fuel cell stack flows;
• a discharge passage through which the oxygen-containing off-gas discharged from the fuel cell stack flows;
• a bypass channel connecting the supply passage and the discharge passage;
• an oxygen-containing gas supply unit provided in the supply passage and configured to supply the oxygen-containing gas to the fuel cell stack;
• a flow rate measurement unit disposed in the supply passage and configured to measure a flow rate of the oxygen-containing gas flowing through the supply passage;
• and
• a bypass valve provided in the bypass channel, an opening degree of the bypass valve being adjustable;
• a stop valve provided in the discharge passage, an opening degree of the stop valve being adjustable;
• and
• one or more processors that execute computer-executable instructions stored in a memory, wherein the one or more processors are configured by the computer-executable instructions to:
• acquire a calculation value of a flow rate of the oxygen containing gas flowing through the supply passage based on the opening degree of the bypass valve, the opening degree of the stop valve and a state of oxygen-containing gas supply in the oxygen-containing gas supply unit, and determine a measurement value by the flow rate measurement unit to be anomalous in a case where a difference between the calculation value and the measurement value by the flow rate measurement unit is equal to or greater than a predetermined value.