Fuel cell system having heating unit to release solid-solved hydrogen from pressure sensor

A fuel cell system comprising:

• a fuel cell;
• a tank configured to store a fuel gas;
• a supply passage configured so that the fuel gas is supplied through the supply passage from the tank to the fuel cell;
• a first valve configured to open and close the supply passage;
• a second valve configured to open and close the supply passage, the first valve and the second valve being provided in an order of the first valve and the second valve in a direction from an upstream side toward a downstream side of the supply passage;
• a bypass passage that branches from a detection target region between the first valve and the second valve of the supply passage, and communicates with a downstream region of the supply passage located farther on the downstream side of the supply passage than the second valve;
• a fifth valve configured to open and close the bypass passage and a sixth valve configured to open and close the bypass passage, wherein
• the fifth valve and the sixth valve are provided at an upstream side of the bypass passage to a downstream side of the bypass passage in this order,
• a region between the fifth valve and the sixth valve has a relay region, and
• the fifth valve is configured to switch between a third state in which the fifth valve is opened such that the relay region communicates with the detection target region while isolated from the downstream region, and a fourth state in which the fifth valve is closed such that the relay region is isolated from the detection target region while communicating with the downstream region;
• a pressure sensor configured to detect a pressure in the relay region;
• a heating unit configured to heat the pressure sensor;
• and
• a controller configured to make the heating unit heat the pressure sensor in a state in which a detection value of the pressure sensor is not larger than a pressure threshold value when the fuel gas is supplied to the fuel cell, wherein
• the pressure sensor is configured to detect a pressure in the detection target region through the relay region, and
• the controller is configured to make the heating unit heat the pressure sensor in a state in which the detection value is not larger than the pressure threshold value and the fuel cell system is in the fourth state.