FUEL CELL SYSTEM, CONTROL METHOD FOR THE FUEL CELL SYSTEM, AND STATE DETECTION METHOD FOR FUEL CELL

摘要

A fuel cell system includes a fuel cell, a fuel supply portion that supplies fuel to the fuel cell, a combustion portion that burns an anode exhaust gas discharged from the anode of the fuel cell, and an oxygen concentration detection portion that detects the oxygen concentration in a predetermined gas. The fuel flow control portion controls the amount of flow of fuel supplied from the fuel supply portion to the fuel cell so that the amount of fluctuation of the oxygen concentration in the combustion exhaust gas discharged from the combustion portion which is detected by the oxygen concentration detection portion is between a first value and a second value that is larger than the first value.