IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0016255
(2011-01-28)
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등록번호 |
US-8155896
(2012-04-10)
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발명자
/ 주소 |
- Wargo, Christopher
- Niermeyer, J. Karl
- Shyu, Jieh-Hwa
- Brodeur, Craig L.
- Basser, William
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
3 인용 특허 :
16 |
초록
▼
Embodiments disclosed herein provide restrictive-flow flow measurement devices, valve improvements and signal control devices and processes that control the flow of liquids, including control processes for single-liquid calibration. In some embodiments, a fluid flow device can be calibrated using a
Embodiments disclosed herein provide restrictive-flow flow measurement devices, valve improvements and signal control devices and processes that control the flow of liquids, including control processes for single-liquid calibration. In some embodiments, a fluid flow device can be calibrated using a single standard calibration fluid. The fluid flow of a first fluid through a flow meter is measured by calculating a first pressure difference between pressures sensed by two pressure sensors of the flow meter. The fluid flow of a second fluid through the flow meter is measured by calculating a second pressure difference between pressures sensed by the same two pressure sensors. A calibration coefficient is determined based upon the relationship between the flow rate, the fluid density and the calculated pressure difference for the first and second fluids. A relationship between the calibration coefficient and the kinematic viscosity of each fluid is then determined and stored.
대표청구항
▼
1. A method for controlling the dispense of fluid from a dispenser to a point of use, comprising: sensing a pressure drop across a restrictive flow element, wherein the restrictive flow element is in fluid communication with a fluid inlet of a proportional fluid flow valve; andmodulating the proport
1. A method for controlling the dispense of fluid from a dispenser to a point of use, comprising: sensing a pressure drop across a restrictive flow element, wherein the restrictive flow element is in fluid communication with a fluid inlet of a proportional fluid flow valve; andmodulating the proportional fluid flow valve based on application of fuzzy logic to a change in a flow rate over time (dF/dt) and a flow rate error, wherein the flow rate is calculated based on the pressure drop across the restrictive flow element and wherein the application of fuzzy logic comprises fuzzification, rule evaluation and defuzzification of the change. 2. The method according to claim 1, wherein the application of fuzzy logic further comprises: comparing dF/dt to a set of dF/dt membership functions to determine a degree of truth for each dF/dt membership function;comparing the flow rate error to a set of error membership functions to determine a degree of truth for each error membership function; andgenerating a fuzzy output based on the degrees of truth for the dF/dt membership functions and the degrees of truth for the error membership functions. 3. The method according to claim 2, wherein the fuzzy output corresponds to a change to be applied to the proportional fluid flow valve. 4. The method according to claim 2, wherein the generating step further comprises: selecting a smallest degree of truth for the dF/dt membership functions;selecting a smallest degree of truth for the error membership functions; andgenerating the fuzzy output based on the smallest degree of truth for the dF/dt membership functions and the smallest degree of truth for the error membership functions. 5. The method according to claim 2, wherein the set of error membership functions comprises a negative error membership function, a neutral zero error membership function, and a positive error membership function. 6. The method according to claim 1, wherein fuzzification, rule evaluation and defuzzification comprise: quantizing input variables into a set of fuzzy inputs with varying degrees of truth;generating a set of fuzzy outputs with varying degrees of truth based on the set of fuzzy inputs; andgenerating a system output based on two or more of the set of fuzzy outputs. 7. The method according to claim 6, further comprising: dropping a fuzzy output having lowest degree of truth among the set of fuzzy outputs. 8. The method according to claim 6, further comprising: selecting only fuzzy outputs with degrees of truth above a predetermined value. 9. The method according to claim 6, wherein each of the set of fuzzy outputs is associated with a discrete change in a valve output. 10. The method according to claim 1, wherein an actuator is provided to modulate the proportional fluid flow valve. 11. The method according to claim 10, wherein a controller responsive to the measured pressure drop is provided to control the actuator. 12. A method for controlling the dispense of fluid from a dispenser to a point of use, comprising: sensing a pressure drop across a restrictive flow element, wherein the restrictive flow element is in fluid communication with a fluid inlet of a proportional fluid flow valve;determining a flow rate based on the pressure drop across the restrictive flow element;applying fuzzy logic rules to a change in the flow rate over time and a flow rate error; andmodulating the proportional fluid flow valve based on the application of fuzzy logic rules to the change in the flow rate over time and flow rate error. 13. A method for controlling the dispense of fluid from a dispenser to a point of use, comprising: providing a proportional flow valve having a fluid inlet and a fluid outlet;providing a restrictive flow element in fluid communication with the fluid inlet, the restrictive flow element creating a pressure drop;providing an upstream pressure sensor and a downstream pressure sensor; andproviding a controller in communication with the upstream pressure sensor and the downstream pressure sensor, wherein the controller is operable to: receive an upstream pressure signal from the upstream pressure sensor;receive a downstream pressure signal from the downstream pressure sensor;calculate a flow rate based on the upstream pressure signal and the downstream pressure signal;apply fuzzy logic rules to a change in a flow rate over time (dF/dt) and a flow rate error; anddetermine how much to modulate the proportional flow valve based on the application of the fuzzy logic rules to the change in the flow rate over time and flow rate error. 14. The method according to claim 13, wherein the controller is further operable to: compare a flow rate error to a first set of membership functions to generate a first set of fuzzy inputs; andcompare a change in flow rate over time (dF/dt) to a second set of membership functions to generate a second set of fuzzy inputs;wherein each fuzzy input from the first set of fuzzy inputs and the second set of fuzzy inputs is associated with an input degree of truth. 15. The method according to claim 14, wherein the controller is further operable to apply a first set of rules to the first set of fuzzy inputs and the second set of fuzzy inputs to generate a set of fuzzy outputs, wherein each fuzzy output is associated with an output degree of truth. 16. The method according to claim 15, wherein the controller is further operable to: associate each fuzzy output with a discrete change in valve output; andcalculate the overall change in valve output based on the output degree of truth of one or more of the fuzzy outputs and the discrete change in valve output value associated with each of the one or more fuzzy outputs. 17. The method according to claim 16, wherein the controller further comprises a valve driver operable to generate a valve drive signal based on a valve control signal, wherein the valve control signal is based on the change in valve output. 18. The method according to claim 13, wherein the application of the fuzzy logic rules further comprises: quantizing a change in the flow rate over time and a flow rate error into a set of fuzzy inputs;generating a set of fuzzy outputs based on the set of fuzzy inputs; andgenerating a system output based on the set of fuzzy outputs. 19. The method according to claim 18, further comprising: adjusting the proportional flow valve based on the system output. 20. The method according to claim 19, further comprising: providing an actuator for adjusting the proportional flow valve.
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