System and method to reduce fuel system pumping heat input
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-063/02
F02M-063/00
F02C-009/00
출원번호
US-0042450
(2005-01-24)
등록번호
US-7252068
(2007-08-07)
발명자
/ 주소
Eick,Chris D.
Futa, Jr.,Paul W.
출원인 / 주소
Honeywell International, Inc.
대리인 / 주소
Ingrassia Fisher & Lorenz
인용정보
피인용 횟수 :
4인용 특허 :
7
초록▼
The present invention discloses a relatively simple system and method to reduce fuel system pumping by automatically turning on and off servo flow to various non-needed devices or "start lockout" servos during engine start. The invention takes advantage of a fuel pressure rise provided by the fuel p
The present invention discloses a relatively simple system and method to reduce fuel system pumping by automatically turning on and off servo flow to various non-needed devices or "start lockout" servos during engine start. The invention takes advantage of a fuel pressure rise provided by the fuel pump during the period from engine start until the pump speed is greater than windmill. This pressure rise is used to move a pressure activated piston in a servo shutoff valve from a normally closed position to an open position, which at higher pressures allow servo flow to the "start lockout" servos through the servo lockout valve. When the pressure is reduce, the piston return to a normally closed position due to a biasing spring closing the servo lockout valve. This opening and closing of the servo lockout valve occurs automatically with no other external input.
대표청구항▼
We claim: 1. A servo lockout valve for use in a servo lockout system coupled to a fuel pump, comprising: a body having a first fluid inlet, a first fluid outlet, a second fluid inlet, and a second fluid outlet, the first fluid inlet and the first fluid outlet configured to communicate with the serv
We claim: 1. A servo lockout valve for use in a servo lockout system coupled to a fuel pump, comprising: a body having a first fluid inlet, a first fluid outlet, a second fluid inlet, and a second fluid outlet, the first fluid inlet and the first fluid outlet configured to communicate with the servo lockout system, and the second fluid inlet and second fluid outlet configured to communicate with the fuel pump; and a pressure activated piston slideably positioned within the body, the piston including an outer surface, an annular passage, and an orifice, the annular passage and the orifice formed on the piston outer surface, wherein the piston is configured to respond to fuel pressure entering the second fluid inlet to move the piston between a first position and a second position based on the fuel pressure, wherein in the first position the first fluid inlet and the first fluid outlet are not in fluid communication and the second fluid inlet, the orifice, and the second fluid outlet are in fluid communication, and in the second position the first fluid inlet, the annular passage, and the first fluid outlet are in fluid communication and the second fluid inlet and the second fluid outlet are in fluid communication. 2. The servo lockout valve of claim 1, wherein the fuel pressure from the fuel pump is based on engine speed. 3. The servo lockout valve of claim 1, wherein the servo lookout system further includes a servo pressure regulator and the first fluid inlet is configured to be coupled to the servo pressure regulator. 4. The servo lockout valve of claim 1, wherein the servo lockout system further includes one or more "start lockout" servos and the first fluid outlet is configured to be coupled to the one or more "start lockout" servos. 5. The servo lockout valve of claim 1, further comprising a biasing spring coupled to the piston, the biasing spring being configured to urge the piston toward the first position. 6. The servo lockout valve of claim 5, wherein the biasing spring provides a pre-load on the piston, and the fuel pressure on the piston must overcome the spring pre-load for the piston to move from the first position. 7. The servo lockout valve of claim 1, wherein the piston has a first side and a second side, and further comprising a pressure equalization passage configured to equalize the pressure on the first side and the second side. 8. The servo lockout valve of claim 7, wherein the pressure equalization passage is open in the first position and closed in the second position. 9. The servo lockout valve of claim 7, further comprising a reset fluid inlet in fluid communication with the second side of the piston when the piston is in the second position. 10. A servo lockout system, comprising a servo pressure regulator; one or more "start lockout" servos; and a servo lockout valve coupled to a fuel pump, the servo lockout valve including: a body having a first fluid inlet coupled the servo pressure regulator, a first fluid outlet coupled to the one or more "start lockout" servos, a second fluid inlet coupled to the fuel pump, and a second fluid outlet; and a pressure activated piston slideably positioned within the body, the piston including an outer surface, an annular passage, and an orifice, the annular passage and the orifice formed on the piston outer surface, wherein the piston is configured to respond to fuel pressure entering the second fluid inlet to move the piston between a first position and a second position based on the fuel pressure, wherein in the first position the first fluid inlet and the first fluid outlet are not in fluid communication, and in the second position the first fluid inlet, the annular passage, and the first fluid outlet are in fluid communication and the second fluid inlet and the second fluid outlet are in fluid communication. 11. The servo lockout system of claim 10, wherein the fuel pressure from the fuel pump is based on engine speed. 12. The servo lockout system of claim 10, further comprising a biasing spring within the housing coupled to the piston, the biasing spring being configured to urge the piston toward the first position. 13. The servo lockout system of claim 12, wherein the biasing spring provides a pre-load on the piston, and the fuel pressure on the piston must overcome the spring pre-load for the piston to move from the first position. 14. The servo lockout system of claim 12, wherein the piston has a first side and a second side, and further comprising a pressure equalization passage configured to equalize the pressure on the first side and the second side. 15. The servo lockout system of claim 14, wherein the pressure equalization passage is open in the first position and closed in the second position. 16. The servo lockout system of claim 14, further comprising a reset fluid inlet in fluid communication with the second side of the piston when the piston is in the second position. 17. A method to automatically turn fuel flow on and off in a servo lockout valve for use in a servo system and coupled to a fuel pump, the servo lockout valve having a pressure activate piston, a first fluid inlet, a first fluid outlet, a second fluid inlet, and a second fluid outlet, the first inlet and the first fluid outlet in communication with the servo system, and the second fluid inlet and the second fluid outlet in communication with the fuel pump, the method comprising the steps of: receiving fuel pressure by the pressure activated piston; and moving the pressure activated piston between a first position and a second position based on the fuel pressure, wherein in the first position there is no fluid flow between the first fluid inlet and the first fluid outlet and the second fluid inlet and the second fluid outlet are in fluid communication, and in the second position there is fluid flow between the first fluid inlet and the first fluid outlet allowing fuel flow through the servo lockout valve and the second fluid inlet and the second fluid outlet are in fluid communication. 18. The method of claim 17, wherein the fuel pressure is based on engine speed. 19. The method of claim 17, wherein the piston includes an annular passage configured to align with both the first fluid inlet and first fluid outlet in the second position. 20. The method of claim 17, further comprising pushing the piston with a biasing spring toward the first position. 21. The method of claim 20, wherein the biasing spring provides a pre-load on the piston and the fuel pressure on the piston must overcome the spring pre-load for the piston to move from the first position. 22. The method of claim 17, further comprising equalizing the pressure between a first side and a second side of the piston with a pressure equalization passage in the servo lockout valve. 23. The method of claim 22, wherein the pressure equalization passage is open in the first position and closed in the second position. 24. The method of claim 22, further comprising resetting the piston to the first position by applying pressure through a reset fluid inlet to the second side of the piston when the piston is in the second position. 25. The method of claim 17, wherein the fuel pressure is from a fuel pump. 26. The method of claim 25, wherein the pressure activate piston coupled to the fuel pump. 27. The method of claim 17, wherein the fluid inlet is coupled to a servo pressure regulator. 28. The method of claim 27, wherein the fluid outlet is coupled to the one or more "start lockout" servos. 29. The method of claim 28, wherein allowing fuel flow through the servo lockout valve in the second position allows fuel to flow from the servo pressure regulator to the one or more "start lockout" servos.
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이 특허에 인용된 특허 (7)
Snow Barton H. (Wyoming OH) Homan Frank R. (Cincinnati OH), Apparatus for windmill starts in gas turbine engines.
Blot-Carretero, Marie-Trinite Rose; Galozio, Philippe; Brocard, Jean-Marie; Maillard, Claude Marcel, Device for economizing fuel supply in a fuel supply circuit.
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