Determining a quantity of transported fluid
A system for determining a quantity of transported fluid, includes a measured parameter receiver ( 1 ) for obtaining a plurality of measured parameters relating to the fluid within the conduit at different measurement times during at least a predetermined time interval. A measured parameter combiner ( 2 ) for combining the measured parameters relating to the predetermined time interval, to obtain a first quantity indicative of an amount of fluid that has been transported through the conduit during the predetermined time interval. The system further includes a time interval divider ( 3 ) for dividing the predetermined time interval into a plurality of subintervals, and a parameter corrector ( 5 ) for determining a corrected value for at least one of the averaged parameters. A quantity corrector ( 6 ) for determining a corrected value for the quantity based on the corrected value for the at least one of the averaged parameters.
1. A system for determining a quantity of transported fluid, comprising:
an interface that receives a plurality of measured parameters corresponding to measurements directed to a fluid within a conduit at different measurement times while the fluid is transported;
a measured parameter receiver for obtaining the plurality of measured parameters relating to the fluid within the conduit at the different measurement times during at least a predetermined time interval;
a measured parameter combiner for combining the measured parameters relating to the predetermined time interval, using a full flow rate calculation, to obtain a first quantity indicative of an amount of fluid that has been transported through the conduit during the predetermined time interval;
a time interval divider for dividing the predetermined time interval into a plurality of subintervals corresponding to respective quantity calculation periods (QCPs);
a parameter associating unit for associating at least one averaged parameter with each of the subintervals, the parameter associating unit comprising
an averaged parameter determiner for determining an averaged parameter for a subinterval based on a plurality of the measured parameters having measurement times that fall within the subinterval,
the measured parameter combiner, the time interval divider, the parameter associating unit, and the averaged parameter determiner performing said combining, dividing, associating, and determining repeatedly as new measured parameters are received;
a parameter corrector for determining a corrected value for at least one of the averaged parameters; and
a quantity corrector for determining a corrected value for the first quantity based on the corrected value for said at least one of the averaged parameters, the quantity corrector comprising
a first averaged parameter combiner for combining the averaged parameters associated with the subintervals, using a factored flow rate calculation, to obtain a first estimated quantity indicative of the amount of fluid that has been transported through the conduit during the predetermined time interval, and
a second averaged parameter combiner for combining the averaged parameters associated with the subintervals, using the factored flow rate calculation, wherein said at least one of the averaged parameters is replaced by the corrected value, to obtain a second estimated quantity indicative of the amount of fluid that has been transported through the conduit during the predetermined time interval.
2. The system according to claim 1 , wherein the quantity corrector is arranged for determining a correction factor based on the first estimated quantity and the second estimated quantity.
3. The system according to claim 2 , wherein the quantity corrector is arranged for determining a corrected value for the first quantity using a formula
Corrected
QTR
=
Σ
Q
from
corrected
QCP
Σ
Q
from
original
QCP
×
Original
QTR
wherein:
Corrected QTR is the corrected value for the first quantity,
Original QTR is the first quantity,
ΣQ from original QCP is the first estimated quantity, and
ΣQ from corrected QCP is the second estimated quantity.
4. The system according to claim 1 , comprising an indicator for indicating the corrected value for the quantity to a user.
5. The system according to claim 1 , further comprising:
an interface for receiving the measured parameters while the fluid is transported,
wherein the system is arranged for updating the corrected value for the quantity a plurality of times while the fluid is transported.
6. The system according to claim 5 , further comprising:
an error detector for detecting an error condition in the measured parameters,
wherein the error detector is arranged for triggering the parameter corrector and/or the quantity corrector upon detecting the error condition.
7. The system according to claim 5 , further comprising:
a threshold detector for detecting when the corrected quantity exceeds a predetermined threshold value.
8. The system according to claim 5 , further comprising:
a control unit for controlling the transport of the fluid based on the corrected quantity.
9. The system according to claim 1 , wherein the time interval divider is arranged for assigning separate subintervals for a period with an error condition and a period without the error condition.
10. The system according to claim 1 , further comprising:
a sensor for measuring at least some of the measured parameters.
11. A flow computer comprising the system according to claim 1 .
12. A method of determining a quantity of transported fluid, comprising:
receiving, via an interface, while a fluid is transported through a conduit, a plurality of measured parameters relating to the fluid at different measurement times during at least a predetermined time interval;
combining the measured parameters relating to the predetermined time interval, using a full flow rate calculation, to obtain a quantity indicative of an amount of fluid that has been transported through the conduit during the predetermined time interval;
dividing the predetermined time interval into a plurality of subintervals corresponding to respective quantity calculation periods (QCPs);
associating at least one averaged parameter with each of the subintervals, wherein an averaged parameter for a subinterval is determined based on a plurality of the measured parameters having measurement times that fall within the subinterval,
the steps of combining, dividing, associating being performed repeatedly as new measured parameters are received;
determining a corrected value for at least one of the averaged parameters; and
determining a corrected value for the first quantity based on the corrected value for said at least one of the averaged parameters, including the sub-steps of
combining the averaged parameters associated with the subintervals, using a factored flow rate calculation, to obtain a first estimated quantity indicative of the amount of fluid that has been transported through the conduit during the predetermined time interval, and
combining the averaged parameters associated with the subintervals, using the factored flow rate calculation, wherein said at least one of the averaged parameters is replaced by the corrected value, to obtain a second estimated quantity indicative of the amount of fluid that has been transported through the conduit during the predetermined time interval.
13. A non-transitory computer readable medium encoded with a computer program product comprising instructions for causing a processor system to perform the method according to claim 12 .
14. The method according to claim 12 , further comprising:
prior to said obtaining step, providing a sensor that measures and outputs at least one of the measured parameters; and
causing the sensor to sense the at least one of the measured parameters from the conduit transporting the fluid.
15. The method according to claim 12 , further comprising:
storing the at least one of the measured parameters in a memory device.