Fuel cell system

A fuel cell system comprising:

• a fuel cell including an electrolyte membrane made of a solid polymer, a fuel electrode disposed on one side of the electrolyte membrane, and an air electrode disposed on another side of the electrolyte membrane;
• a first actuator capable of adjusting a first state quantity indicating an internal state of the fuel cell;
• a second actuator capable of adjusting a second state quantity different from the first state quantity and indicating the internal state of the fuel cell;
• and
• a control unit configured to control operation of the first actuator and operation of the second actuator, wherein
• the control unit is configured to perform a first control and a second control, the first control includes acquiring a present value of the first state quantity and controlling the operation of the first actuator so as to change the first state quantity in such a manner that the present value of the first state quantity that is acquired approaches a predetermined first target value, and the second control includes acquiring a present value of the second state quantity and controlling the operation of the second actuator so as to change the second state quantity in such a manner that the present value of the second state quantity that is acquired approaches a predetermined second target value,
• the first state quantity is a relative humidity of the electrolyte membrane or a physical quantity related to the relative humidity,
• the second state quantity is a gas diffusion resistance of the air electrode, and
• the control unit is configured to perform the second control after performing the first control.

A fuel cell system comprising:

• a fuel cell including an electrolyte membrane made of a solid polymer, a fuel electrode disposed on one side of the electrolyte membrane, and an air electrode disposed on another side of the electrolyte membrane;
• a first actuator capable of adjusting a first state quantity indicating an internal state of the fuel cell;
• a second actuator capable of adjusting a second state quantity different from the first state quantity and indicating the internal state of the fuel cell;
• and
• a control unit configured to control operation of the first actuator and operation of the second actuator, wherein
• the control unit is configured to perform a first control and a second control, the first control includes acquiring a present value of the first state quantity and controlling the operation of the first actuator so as to change the first state quantity in such a manner that the present value of the first state quantity that is acquired approaches a predetermined first target value, and the second control includes acquiring a present value of the second state quantity and controlling the operation of the second actuator so as to change the second state quantity in such a manner that the present value of the second state quantity that is acquired approaches a predetermined second target value,
• the first state quantity is a relative humidity of the electrolyte membrane or a physical quantity related to the relative humidity,
• the second state quantity is an oxide film ratio of a catalyst included in the air electrode,
• the control unit is configured to perform the second control after performing the first control,
• the fuel cell system further comprises a third actuator capable of adjusting a gas diffusion resistance of the air electrode as a third state quantity indicating the internal state of the fuel cell, and
• the control unit is configured to perform a third control after performing the second control, and the third control includes acquiring a present value of the third state quantity and controlling operation of the third actuator so as to change the third state quantity in such a manner that the present value of the third state quantity that is acquired approaches a predetermined third target value.