IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0080063
(2005-03-14)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Precision Engine Controls Corp.
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 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 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
▼
The invention claimed is: 1. A gas control valve, comprising: a variable flow metering device capable of realizing a plurality of predetermined mass flow rates by varying configuration of the flow metering device; at least one sensor configured to: a. detect variable configurations of the flow mete
The invention claimed is: 1. A gas control valve, comprising: a variable flow metering device capable of realizing a plurality of predetermined mass flow rates by varying configuration of the flow metering device; at least one sensor configured to: a. detect variable configurations of the flow metering device and generate a first output signal that is a function of the configuration of the flow metering device; b. detect fluid pressure upstream of the flow metering device and generate a second output signal that is a function of the detected upstream fluid pressure; c. detect fluid pressure downstream of the flow metering device and generate a third output signal that is a function of the detected downstream fluid pressure; d. detect temperature upstream of a flow metering device and generate 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 configuration of the flow metering device, 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 configuration of the flow metering device, 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 gas control valve of claim 1, wherein the variable flow metering device comprises a flow metering tube and a flow diverter, the flow metering device supported for axial positioning relative to the flow diverter to regulate mass flow rate through the flow metering device. 3. The gas control valve of claim 1, wherein the at least one sensor comprises at least one pressure sensor configured to detect differential pressure between a first location upstream of the flow metering device and a second location downstream of the flow metering device. 4. The gas control valve of claim 3, wherein the at least one pressure sensor comprises a first pressure sensor provided upstream of the flow metering device and a second pressure sensor provided downstream of the flow metering device. 5. The gas control valve of claim 1, wherein the at least one sensor comprises a temperature sensor configured to detect temperature upstream of the flow metering device. 6. The gas control valve of claim 1, wherein the variable flow metering device has a known coefficient of discharge and flow area. 7. The gas control valve of claim 6, wherein the coefficient of discharge and the flow area are each functions of position of the flow metering device. 8. The gas control valve of claim 7, wherein the flow area and the coefficient of discharge are proportionally related. 9. The gas control valve of claim 7, further comprising a first lookup table of coefficient of discharge times area versus position of the flow metering device for subsonic flow and a second lookup table of coefficient of discharge times area versus position of the flow metering device for sonic flow. 10. The gas control valve of claim 9, 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. 11. 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 at least two of: a. position of the valve, b. pressure upstream of the valve, c. pressure downstream of the valve, and d. 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 calculating a new position for the valve that realizes the calculated coefficient of discharge times area for the valve. 12. The method of claim 11, further comprising positioning the valve to the new position. 13. The method of claim 11, wherein the valve comprises a coaxial valve having a flow tube that is axially positioned to realize a desired flow rate through the valve. 14. The method of claim 11, wherein sensing comprises sensing pressure upstream of the valve and pressure downstream of the valve. 15. The method of claim 11, wherein sensing comprises sensing position of the valve and temperature upstream of the valve. 16. The method of claim 11, wherein providing a coefficient of discharge through the valve comprises providing a lookup table of coefficients of discharge versus valve position in memory. 17. The method of claim 11, further comprising using a determined coefficient of discharge for realizing a desired mass flow rate, retrieving a corresponding valve position from the lookup table. 18. A turbine valve control system, comprising: a variable flow metering device having a known coefficient of discharge and flow area, the flow metering device capable of meeting a plurality of predetermined mass flow rates by varying positioning of the flow metering device, with the coefficient of discharge and the flow area each being functions of position 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. 19. The turbine valve control system of claim 18, wherein the flow area and the coefficient of discharge are proportionally related. 20. The turbine valve control system of claim 19, further comprising a lookup table of coefficient of discharge times area versus position of the flow metering device.
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