FUEL CELL SYSTEM, FUEL CELL VEHICLE, AND CONTROL METHOD FOR FUEL CELL SYSTEM

A fuel cell system mounted in a vehicle (10) includes a fuel cell (110) supplying electric power to a motor (136) driving the vehicle (10), a pump supplying oxygen to the fuel cell (110), an accelerator position detection unit (190) detecting an accelerator depression amount of the vehicle, and a control unit (180) calculating electric power required to be generated by the fuel cell (110) and electric power required for driving of the pump based on the accelerator depression amount and controlling the pump based on the electric power required for the driving, in which the control unit (180) calculates the electric power required for the driving such that a rate of increase in the electric power required for the driving exceeds a rate of increase in the electric power required to be generated when the calculated electric power required to be generated increases.