Flow rate calculation system, flow rate calculation system program, flow rate calculation method, and flow rate calculation device

A recording medium recording a flow rate calculation system program used for a flow rate calculation system including a tank into which fluid flows, an inflow line through which the fluid flows into the tank, and a pressure sensor that detects pressure inside the tank, the flow rate calculation system program fulfilling functions as:

• a pressure change data storage part that stores pressure change data indicating a temporal change in the pressure detected by the pressure sensor during an inflow period from start flowing the fluid into the tank through the inflow line to stop flowing the fluid into the tank;
• a flow rate calculation part that, on a basis of a pressure change rate calculated from the pressure change data, calculates an estimated flow rate of the fluid estimated to flow through the inflow line during the inflow period;
• and
• a flow rate correction part that, on a basis of first pressure detected by the pressure sensor after a predetermined time has elapsed since stop flowing the fluid into the tank and second pressure included in the pressure change data and higher than the first pressure, corrects the estimated flow rate calculated by the flow rate calculation part.

A flow rate calculation method used for a flow rate calculation system including a tank into which fluid flows, an inflow line through which the fluid flows into the tank, and a pressure sensor that detects pressure inside the tank, the flow rate calculation method comprising the steps of:

• storing pressure change data indicating a temporal change in the pressure detected by the pressure sensor during an inflow period from start flowing the fluid into the tank through the inflow line to stop flowing the fluid into the tank;
• on a basis of a pressure change rate calculated from the pressure change data, calculating an estimated flow rate of the fluid estimated to flow through the inflow line during the inflow period;
• and
• on a basis of first pressure detected by the pressure sensor after a predetermined time has elapsed since stop flowing the fluid into the tank and second pressure included in the pressure change data and higher than the first pressure, correcting the estimated flow rate calculated by the flow rate calculation part.

A flow rate calculation device used for a flow rate calculation system including a tank into which fluid flows, an inflow line through which the fluid flows into the tank, and a pressure sensor that detects pressure inside the tank, the flow rate calculation device comprising:

• a pressure change data storage part that stores pressure change data indicating a temporal change in the pressure detected by the pressure sensor during an inflow period from start flowing the fluid into the tank through the inflow line to stop flowing the fluid into the tank;
• a flow rate calculation part that, on a basis of a pressure change rate calculated from the pressure change data, calculates an estimated flow rate of the fluid estimated to flow through the inflow line during the inflow period;
• and
• a flow rate correction part that, on a basis of first pressure detected by the pressure sensor after a predetermined time has elapsed since stop flowing the fluid into the tank and second pressure included in the pressure change data and higher than the first pressure, corrects the estimated flow rate calculated by the flow rate calculation part.

A flow rate calculation system including a tank into which fluid flows, an inflow line through which the fluid flows into the tank, a pressure sensor that detects pressure inside the tank, and a temperature sensor that detects temperature inside or of the tank, the flow rate calculation system further comprising:

• a pressure change data storage part that stores pressure change data indicating a temporal change in the pressure detected by the pressure sensor during an inflow period from start flowing the fluid into the tank through the inflow line to stop flowing the fluid into the tank;
• a temperature change data storage part that stores temperature change data indicating a temporal change in the temperature detected by the temperature sensor during the inflow period;
• a flow rate calculation part that, on a basis of a pressure change rate calculated from the pressure change data, calculates an estimated flow rate of the fluid estimated to flow through the inflow line during the inflow period;
• and
• a flow rate correction part that, on a basis of first temperature detected by the temperature sensor after a predetermined time has elapsed since closing a first on-off valve and second temperature included in the temperature change data and higher than the first temperature, corrects the estimated flow rate calculated by the flow rate calculation part.