System, method and computer program for determining fluid flow rate using a pressure sensor and a thermal mass flow sensor
First Claim
1. A system for determining a flow rate of a fluid, comprising:
- at least one conduit defining a flow path along which the fluid flows;
at least one thermal sensor that generates a thermal sensor signal, which is proportional to a mass flow rate of the fluid;
at least one pressure sensor that generates a pressure sensor signal, which indicates the pressure of the fluid;
one or more electronics that;
generate a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from the thermal sensor signal;
generate a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from the pressure sensor signal;
generate at least one calibration factor using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate;
generate a calibrated pressure sensor based mass flow rate by using the at least one calibration factor to modify the pressure sensor based mass flow rate;
generate a calibrated thermal sensor based mass flow rate by using the at least one calibration factor to modify the thermal sensor based mass flow rate;
determine whether operating conditions are substantially stable;
output the calibrated thermal sensor based mass flow rate in response to a determination that the operating conditions are substantially stable; and
output the calibrated pressure sensor based mass flow rate in response to a determination that the operating conditions are not substantially stable.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a system, method, and computer program product for determining the flow rate of a fluid. The system, method, and computer program product generate a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from the thermal sensor signal (36). The system, method, and computer program product generate a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from the pressure sensor signal (51a). The system, method, and computer program product generate at least one calibration factor (ψ) using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate. The system, method, and computer program product may generate a calibrated pressure sensor based mass flow rate by using the at least one calibration factor (ψ) to modify the pressure sensor based mass flow rate. The system, method, and computer program product may generate a calibrated thermal sensor based mass flow rate by using the at least one calibration factor (ψ) to modify the thermal sensor based mass flow rate.
-
Citations
78 Claims
-
1. A system for determining a flow rate of a fluid, comprising:
-
at least one conduit defining a flow path along which the fluid flows; at least one thermal sensor that generates a thermal sensor signal, which is proportional to a mass flow rate of the fluid; at least one pressure sensor that generates a pressure sensor signal, which indicates the pressure of the fluid; one or more electronics that; generate a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from the thermal sensor signal; generate a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from the pressure sensor signal; generate at least one calibration factor using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate; generate a calibrated pressure sensor based mass flow rate by using the at least one calibration factor to modify the pressure sensor based mass flow rate; generate a calibrated thermal sensor based mass flow rate by using the at least one calibration factor to modify the thermal sensor based mass flow rate; determine whether operating conditions are substantially stable; output the calibrated thermal sensor based mass flow rate in response to a determination that the operating conditions are substantially stable; and output the calibrated pressure sensor based mass flow rate in response to a determination that the operating conditions are not substantially stable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method of determining a flow rate of a fluid, comprising the steps of:
-
using at least one thermal sensor to generate a thermal sensor signal, which is proportional to a mass flow rate of the fluid; using at least one pressure sensor to generate a pressure sensor measurement signal, which indicates the pressure of the fluid; using one or more electronics to; generate a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from the thermal sensor measurement signal; generate a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from the pressure sensor signal; generate at least one calibration factor using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate; generate a calibrated pressure sensor based mass flow rate by using the at least one calibration factor to modify the pressure sensor based mass flow rate; generate a calibrated thermal sensor based mass flow rate by using the at least one calibration factor to modify the thermal sensor based mass flow rate; determine whether operating conditions are substantially stable; output the calibrated thermal sensor based mass flow rate in response to a determination that the operating conditions are substantially stable; and output the calibrated pressure sensor based mass flow rate in response to a determination that the operating conditions are not substantially stable. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
-
27. A non-transitory computer usable medium including executable code for executing a process for determining a flow rate of a fluid, the process comprising:
-
generating a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from a thermal sensor measurement signal from a thermal mass flow sensor; generating a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from a pressure sensor signal from a pressure sensor; generating at least one calibration factor using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate; generating a calibrated pressure sensor based mass flow rate by using the at least one calibration factor to modify the pressure sensor based mass flow rate; generating a calibrated thermal sensor based mass flow rate by using the at least one calibration factor to modify the thermal sensor based mass flow rate; determining whether operating conditions are substantially stable; outputting the calibrated thermal sensor based mass flow rate in response to a determination that the operating conditions are substantially stable; and outputting the calibrated pressure sensor based mass flow rate in response to a determination that the operating conditions are not substantially stable. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
-
-
40. A system for determining a flow rate of a fluid, comprising:
-
at least one conduit defining a flow path along which the fluid flows; at least one thermal sensor that generates a thermal sensor signal, which is proportional to a mass flow rate of the fluid; at least one pressure sensor that generates a pressure sensor signal, which indicates the pressure of the fluid; one or more electronics that; generate a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from the thermal sensor signal; generate a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from the pressure sensor signal; generate at least one calibration factor using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate; generate a calibrated thermal sensor based mass flow rate by using the at least one calibration factor to modify the thermal sensor based mass flow rate; and automatically update periodically the at least one calibration factor during substantially stable operating conditions when a set point, the thermal sensor based mass flow rate, and fluid pressure are substantially stable. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
-
-
53. A method of determining a flow rate of a fluid, comprising the steps of:
-
using at least one thermal sensor to generate a thermal sensor signal, which is proportional to a mass flow rate of the fluid; using at least one pressure sensor to generate a pressure sensor measurement signal, which indicates the pressure of the fluid; using one or more electronics to; generate a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from the thermal sensor measurement signal; generate a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from the pressure sensor signal; generate at least one calibration factor using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate; and generate a calibrated thermal sensor based mass flow rate by using the at least one calibration factor to modify the thermal sensor based mass flow rate; and automatically update periodically the at least one calibration factor during substantially stable operating conditions when a set point, the thermal sensor based mass flow rate, and fluid pressure are substantially stable. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
-
-
66. A non-transitory computer usable medium including executable code for executing a process for determining a flow rate of a fluid, the process comprising:
-
generating a thermal sensor based mass flow rate for the fluid, where the thermal sensor based mass flow rate is determined at least in part from a thermal sensor measurement signal from a thermal mass flow sensor; generating a pressure sensor based mass flow rate for the fluid, wherein the pressure sensor based mass flow rate is determined at least in part from a pressure sensor signal from a pressure sensor; generating at least one calibration factor using the thermal sensor based mass flow rate and the pressure sensor based mass flow rate; generating a calibrated thermal sensor based mass flow rate by using the at least one calibration factor to modify the thermal sensor based mass flow rate; and automatically updating periodically the at least one calibration factor during substantially stable operating conditions when a set point, the thermal sensor based mass flow rate, and fluid pressure are substantially stable. - View Dependent Claims (67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
-
Specification