Fuel calculation device, fuel calculation method, and program

A fuel management method comprising:

• periodically calculating and storing an estimated current total measured value of a remaining fuel amount remaining in a plurality of fuel containers connected in series via a supply line, each of the plurality of fuel containers having a respective one a plurality of fuel gauges associated therewith, the calculating and storing being based on a previous total measured value of the remaining fuel amount remaining in the plurality of fuel containers and a fuel flow rate of fuel supplied from the plurality of fuel containers;
• determining whether any of the plurality of fuel gauges that output a measured actual value of the remaining fuel amount is in failure;
• causing the remaining fuel amount to be displayed;
• as a normal display of an actual total measured value of the remaining fuel amount when none of the plurality of fuel gauges is in failure, and
• as a backup display of an estimated total measured value of the remaining fuel amount when at least one of the plurality of fuel gauges is in failure;
• and
• using a determination formula to determine whether a respective one of the plurality of fuel containers associated with a failed one of the plurality of fuel gauges is empty based on an upstream or downstream positional relationship of all of the plurality of fuel containers connected in series,
• wherein the remaining fuel amount is displayed:
• as the normal display of the actual total measured value of the remaining fuel amount even if at least one of the plurality of fuel gauges is determined to have failed if the respective one of the fuel containers associated with the failed at least one of the plurality of fuel gauges is determined to be empty by the determination formula, and
• as the backup display of the estimated total measured value of the remaining fuel amount if at least one of the plurality of fuel gauges is determined to have failed and the respective one of the fuel containers associated with the failed at least one of the plurality of fuel gauges is determined to not be empty by the determination formula.

A non-transitory computer-readable storage medium storing a program causing a computer to operate a fuel management system to perform:

• periodically calculating and storing an estimated current total measured value of a remaining fuel amount remaining in a plurality of fuel containers connected in series via a supply line, each of the plurality of fuel containers having a respective one a plurality of fuel gauges associated therewith, the calculating and storing being based on a previous total measured value of the remaining fuel amount remaining in the plurality of fuel containers and a fuel flow rate of fuel supplied from the plurality of fuel containers;
• determining whether any of the plurality of fuel gauges that output a measured actual value of the remaining fuel amount is in failure;
• causing the remaining fuel amount to be displayed;
• as a normal display of an actual total measured value of the remaining fuel amount when none of the plurality of fuel gauges is in failure, and
• as a backup display of an estimated total measured value of the remaining fuel amount when at least one of the plurality of fuel gauges is in failure;
• and
• using a determination formula to determine whether a respective one of the plurality of fuel containers associated with a failed one of the plurality of fuel gauges is empty based on an upstream or downstream positional relationship of all of the plurality of fuel containers connected in series,
• wherein the remaining fuel amount is displayed:
• as the normal display of the actual total measured value of the remaining fuel amount even if at least one of the plurality of fuel gauges is determined to have failed if the respective one of the fuel containers associated with the failed at least one of the plurality of fuel gauges is determined to be empty by the determination formula, and
• as the backup display of the estimated total measured value of the remaining fuel amount if at least one of the plurality of fuel gauges is determined to have failed and the respective one of the fuel containers associated with the failed at least one of the plurality of fuel gauges is determined to not be empty by the determination formula.