Method for diagnosing failure in pressure gauge of hydrogen filling system and method for calibrating pressure gauge of hydrogen filling system

A method for diagnosing failure in a pressure gauge of a hydrogen filling system, comprising:

• providing a hydrogen filling system that includes:
• an accumulator in which hydrogen fuel is accumulated;
• a dispenser configured to fill a fuel cell vehicle powered by hydrogen fuel with the hydrogen fuel from the accumulator;
• a plurality of pressure gauges disposed at different positions in a flow passage of the hydrogen fuel between the accumulator and the outlet of the dispenser;
• and
• a control circuit configured to control the hydrogen filling system, wherein the method further includes:
• acquiring, with the control circuit, pressure values measured by the plurality of pressure gauges at a time that a pressure gauge closest to an outlet of the dispenser in the plurality of pressure gauges indicates a highest value during the filling of the hydrogen fuel,
• determining, with the control circuit, whether or not a deviation between the pressure values is within a threshold pressure value on the basis of acquired pressure values from only the plurality of pressure gauges disposed between the accumulator and the outlet of the dispenser, and
• outputting, with the control circuit, a determination result;
• accumulating the hydrogen fuel in a multi-stage accumulator including the accumulator;
• and
• providing the plurality of pressure gauges at least at a position adjacent to each accumulator of the multi-stage accumulator, near an inlet in the dispenser, and near an outlet in the dispenser.