IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0680617
(2003-10-06)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Precision Engine Controls Corp.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
15 인용 특허 :
35 |
초록
▼
A turbine valve control system is provided. The turbine valve control system includes a variable flow metering device, a first sensor, a second sensor, a third sensor, a fourth sensor, memory, and processing circuitry. The variable flow metering device is capable of meeting a plurality of predetermi
A turbine valve control system is provided. The turbine valve control system includes a variable flow metering device, a first sensor, a second sensor, a third sensor, a fourth sensor, memory, and processing circuitry. The variable flow metering device is capable of meeting a plurality of predetermined mass flow rates by varying positioning of the flow metering device. The first sensor is configured for detecting variable positioning of the flow metering device and generating a first output signal that is a function of the positioning of the flow metering device. The second sensor is configured for detecting fluid pressure upstream of the flow metering device and generating a second output signal that is a function of the detected upstream fluid pressure. The third sensor is configured for detecting fluid pressure downstream of the flow metering device and generating a third output signal that is a function of the detected downstream fluid pressure. The fourth sensor is configured for detecting temperature upstream of the flow metering device and generating a fourth output signal that is a function of the detected temperature. The memory includes first computer program code for calculating a combined coefficient of discharge times area that gives a desired flow for a given valve position, upstream pressure, downstream pressure, and temperature for subsonic flow. The memory also includes second computer program code for calculating a combined coefficient of discharge times area that gives a desired flow for a given valve position, upstream pressure, and temperature for sonic flow. The processing circuitry is configured to receive the signals, determine whether the flow is subsonic or sonic, and implement a corresponding one of the first and second computer program codes to calculate a combined coefficient of discharge times area that will generate a desired mass flow rate for the flow metering device. A method is also provided.
대표청구항
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1. A turbine valve control system, comprising:a variable flow metering device capable of meeting a plurality of predetermined mass flow rates by varying positioning of the flow metering device; a first sensor for detecting variable positioning of the flow metering device and generating a first outpu
1. A turbine valve control system, comprising:a variable flow metering device capable of meeting a plurality of predetermined mass flow rates by varying positioning of the flow metering device; a first sensor for detecting variable positioning of the flow metering device and generating a first output signal that is a function of the positioning of the flow metering device; a second sensor for detecting fluid pressure upstream of the flow metering device and generating a second output signal that is a function of the detected upstream fluid pressure; a third sensor for detecting fluid pressure downstream of the flow metering device and generating a third output signal that is a function of the detected downstream fluid pressure; a fourth sensor for detecting temperature upstream of the flow metering device and generating a fourth output signal that is a function of the detected temperature; memory including first computer program code for calculating a combined coefficient of discharge times area that gives a desired flow for a given valve position, upstream pressure, downstream pressure, and temperature for subsonic flow and second computer program code for calculating a combined coefficient of discharge times area that gives a desired flow for a given valve position, upstream pressure, and temperature for sonic flow; and processing circuitry configured to receive the signals, determine whether flow is subsonic or sonic, and implement a corresponding one of the first and second computer program codes to calculate a combined coefficient of discharge times area that will generate a desired mass flow rate for the flow metering device. 2. The turbine valve control system of claim 1 wherein the variable flow metering device has a known coefficient of discharge and flow area.3. The turbine valve control system of claim 2 wherein the memory includes a lookup table of coefficient of discharge times area versus positioning of the flow metering device and the processing circuitry is configured to calculate mass flow rate through the flow metering device.4. The turbine valve control system of claim 1 wherein the valve comprises a coaxial flow valve having a metering tube axially positioned relative to a flow diverter to regulate mass flow rate.5. The turbine valve control system of claim 4 wherein varied positioning of the flow metering device comprises axial stroke of the metering tube.6. The turbine valve control system of claim 1 wherein the variable flow metering device comprises a flow member configured for variable positioning within the flow metering device to vary mass flow rate through the flow metering device.7. The turbine valve control system of claim 1 wherein the variable flow metering device includes a variable geometry orifice configured to produce variable mass flow rates by varying the degree of restriction at the orifice.8. The turbine valve control system of claim 7 wherein the first computer program code and the second computer program code each calculate mass flow rate through the orifice of the variable flow metering device for subsonic flow and sonic flow, respectively.9. The turbine valve control system of claim 1 wherein the coefficient of discharge and the flow area are each functions of position of the flow metering device.10. The turbine valve control system of claim 9 wherein flow area and coefficient of discharge are proportionally related.11. The turbine valve control system of claim 9 further comprising a first look-up table of coefficient of discharge times area versus position of the flow metering device for subsonic flow and a second look-up table of coefficient of discharge times area versus position of the flow metering device for sonic flow.12. The turbine valve control system of claim 11 wherein the processing circuitry is configured to convert a determined flow demand to a coefficient of discharge times area based at least in part on one of a sonic flow equation and a subsonic flow equation.13. The turbine valve control system of claim 12 wherein one of the first and second lookup tables is used to convert a specific coefficient of discharge to a corresponding position of the flow metering device.14. The turbine valve control system of claim 13 wherein the position of the flow metering device comprises a position demand value for the metering valve.15. A method for measuring gas flow rate into a gas turbine engine, comprising:providing an adjustable position valve having a known coefficient of discharge and flow area for meeting a predetermined mass flow rate at each position of the valve; sensing position of the valve; sensing pressure upstream of the valve; sensing pressure downstream of the valve; sensing temperature upstream of the valve; determining whether flow through the valve is subsonic or sonic; based on whether the flow is determined to be subsonic or sonic, providing a coefficient of discharge times area for the valve that provides a desired flow rate through the valve; and positioning the valve to a new position that achieves the calculated coefficient of discharge times area for the valve. 16. The method of claim 15 wherein the valve comprises a coaxial valve having a flow tube that is axially positioned to adjust flow rate through the valve.17. The method of claim 16 wherein sensing position of the valve comprises providing an axial displacement sensor and sensing axial position of the flow tube relative to a flow diverter that cooperates with a downstream end of the tube to vary mass flow rate between the tube and diverter and out a flow aperture based upon axial position of the tube relative to the diverter and the flow aperture.18. The method of claim 15 wherein determining whether flow through valve is subsonic or sonic comprises determining a ratio of upstream pressure to downstream pressure with a value that separates sonic flow conditions from subsonic flow conditions.19. The method of claim 15 wherein, when the ratio of downstream pressure to upstream pressure is greater than or equal to the value, determining that the flow is subsonic.20. The method of claim 15 wherein, when the ratio of downstream pressure to upstream pressure is less than the value, determining that the flow is sonic.21. The method of claim 15 wherein providing a coefficient of discharge through the valve comprises providing a lookup table of coefficients of discharge versus valve position in memory.22. The method of claim 15 further comprising, using a determined coefficient of discharge for realizing a desired mass flow rate, retrieving a corresponding valve position from the lookup table.23. The method of claim 22 further comprising positioning the valve to the corresponding valve position.24. The method of claim 15 further comprising determining a flow control set point for the valve by converting an analog demand value to a digital count set point.25. The method of claim 24 further comprising adjusting valve position to match the count set point.26. A turbine valve control system, comprising:means for realizing any of a plurality of predetermined mass flow rates; means for detecting position of the flow metering device and generating a first output signal that is a function of the positioning of the flow metering device; means for detecting fluid pressure upstream of the flow metering device and generating a second output signal that is a function of the detected upstream fluid pressure; means for detecting fluid pressure downstream of the flow metering device and generating a third output signal that is a function of the detected downstream fluid pressure; means for detecting temperature upstream of the flow metering device and generating a fourth output signal that is a function of the detected temperature; means for determining a combined coefficient of discharge times area that gives a desired flow for a given valve position, upstream pressure, downstream pressure, and temperature for subsonic flow and second calculating means for calculating a combined coefficient of discharge times area that gives a desired flow for a given valve position, upstream pressure, and temperature for sonic flow; and means for determining whether flow is subsonic or sonic, and configured to implement a corresponding one of the first and second computer program codes to calculate a combined coefficient of discharge times area that will generate a desired mass flow rate for the flow metering device. 27. The turbine valve control system of claim 26 wherein the processing means calculates a ratio of downstream pressure to upstream pressure, and wherein the processing circuitry is configured to compare the ratio with a threshold value that separates subsonic flow from sonic flow.28. The turbine valve control system of claim 27 wherein the ratio below the threshold value corresponds with sonic flow.29. The turbine valve control system of claim 27 wherein the ratio above or equal to the threshold value corresponds with subsonic flow.30. The turbine valve control system of claim 26 further comprising means for mapping a coefficient of discharge times area versus positioning of the means for realizing any of a plurality of predetermined mass flow rates.31. The turbine valve control system of claim 26 further comprising means for converting valve position to a combined coefficient of discharge times area.32. The turbine valve control system of claim 31 further comprising means for calculating mass flow using one of a sonic flow equation and a subsonic flow equation.
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