Fuel cell system

A fuel cell system, comprising:

• a fuel cell;
• a hydrogen gas supply passage configured to supply hydrogen gas to the fuel cell;
• a solenoid valve configured to change an opening degree of the hydrogen gas supply passage;
• a pressure sensor configured to detect a pressure in a downstream supply passage which is a part of the hydrogen gas supply passage from the solenoid valve to the fuel cell;
• and
• a control circuit configured to control the solenoid valve,
• wherein
• the control circuit is configured to perform:
• detection of a rise in the pressure detected by the pressure sensor when increasing a conducted electric current conducted in the solenoid valve from a state where the solenoid valve is closed, and detection of a rising current which is the conducted electric current at a time of the rise in the pressure;
• calculation of an increase characteristic based on the rising current, the increase characteristic being a relationship between the conducted electric current and the pressure when the conducted electric current increases;
• and
• controlling the solenoid valve based on the calculated increase characteristic.