[특허]Method and system for fuel control in a gas turbine engine

Honeywell International Inc.

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특허 상세정보

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Method and system for fuel control in a gas turbine engine

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02C-009/00 F02G-003/00 F04B-049/00
미국특허분류(USC)	417/310; 060/039.281; 417/220
출원번호	US-0863298 (2004-06-08)
등록번호	US-8529221 (2013-09-10)
발명자 / 주소	Futa, Jr., Paul W. Gassman, Brent J. Miller, Harold I. Wiegand, Timothy F.
출원인 / 주소	Honeywell International Inc.
대리인 / 주소	Ingrassia Fisher & Lorenz, P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 9

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A fuel control system (100) for supplying metered fuel flow to a gas turbine engine is disclosed that includes a variable delivery fuel pump (116) for outputting a fuel flow that includes a burn fuel flow for the gas turbine engine and a surplus fuel flow recirculated back to an inlet (124) of the variable delivery fuel pump (116) and a pump control (148, 158, 122) for controlling the output of the variable delivery fuel pump to maintain the surplus fuel flow at a substantially constant rate. A method of controlling a fuel system (100) is also disclosed....

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1. A fuel control system for supplying metered fuel flow to a gas turbine engine comprising: a variable delivery fuel pump for outputting a fuel flow, said fuel flow including a burn fuel flow for the gas turbine engine and a surplus fuel flow recirculated back to an inlet of said variable delivery fuel pump;a metering valve coupled to receive the burn fuel flow;a proportional bypass valve connected between a first point upstream of said metering valve and a second point downstream of said metering valve for maintaining a substantially constant pressure drop across said metering valve; anda pump control for controlling the output of said variable delivery fuel pump to maintain said surplus fuel flow at a substantially constant rate independent of the pressure drop across said metering valve. 2. The fuel control system of claim 1 including a movable element for varying a delivery rate of said variable delivery fuel pump. 3. The fuel control system of claim 2 wherein said pump control comprises a piston operatively connected to said movable element and having a first end exposed to a first pressure and a second end exposed to a second pressure. 4. The fuel control system of claim 3 wherein said pump control comprises a control valve in said surplus fuel flow controlling said first pressure. 5. The fuel control system of claim 1 wherein said burn fuel flow and said surplus fuel flow comprises first and second components of a single flow exiting said fuel pump. 6. The fuel control system of claim 1 wherein said variable delivery fuel pump comprises a positive displacement fuel pump. 7. A fuel delivery system for delivering fuel to a gas turbine engine comprising: a fuel pump delivering fuel at a variable rate and having an inlet and an outlet;a first fuel path from said fuel pump outlet to the engine;a metering valve in said first fuel path;a proportional bypass valve connected between a first point in said first fuel path upstream of said metering valve and a second point in said first fuel path downstream of said metering valve for maintaining a substantially constant pressure drop across said metering valve;a surplus fuel path from said proportional bypass valve to said inlet;a pump control for varying the delivery rate of said pump; anda control valve in said surplus fuel path for controlling said pump control (i) in response to pressure changes in said surplus fuel path and (ii) independent of the pressure drop across said metering valve. 8. The fuel delivery system of claim 7 wherein said pump control comprises a member shiftable in a first direction for increasing said rate and in a second direction for decreasing said rate. 9. The fuel delivery system of claim 8 wherein said member comprises a piston shiftable between a first position and a second position. 10. The fuel delivery system of claim 8 wherein said member comprises a piston shiftable in a cylinder and including a first pressure line running from a first output of said control valve to a first side of said cylinder. 11. The fuel delivery system of claim 10 including a second pressure line running from a fluid flow path of said system and to a second side of said cylinder. 12. The fuel delivery system of claim 11 wherein a pressure in said fluid flow path of said system is controlled by said control valve. 13. The fuel delivery system of claim 10 wherein said surplus fuel path comprises a return flow path from an outlet of said control valve to the inlet of said fuel pump. 14. The fuel delivery system of claim 10 including a pressure relief valve in said surplus fuel path downstream of said control valve. 15. The fuel delivery system of claim 7 wherein said control valve includes a hydraulic bearing. 16. The fuel delivery system of claim 7 wherein said control valve comprises an open center valve. 17. A method of delivering fuel to a gas turbine engine comprising the steps of: providing a fuel pump having an inlet and an outlet;providing a first fuel flow path from said outlet to the engine, said first fuel flow path including a metering valve having a pressure drop there-across;providing a second fuel flow path from a point in said first fuel flow path, upstream of said metering valve, to said inlet; andmaintaining a fuel flow in said second fuel flow path at a substantially constant rate independent of the pressure drop across said metering valve. 18. The method of claim 17 wherein said step of maintaining a fuel flow in the second fuel flow path at a substantially constant rate comprise the steps of detecting pressure changes in the second fuel flow path and changing the output of the fuel pump in response to detected pressure changes. 19. The method of claim 18 wherein the fuel pump comprises a variable delivery positive displacement fuel pump and said step of changing the output of the fuel pump in response to detected pressure changes comprises the step of changing the delivery rate of the fuel pump. 20. The method of claim 19 wherein said step of changing the delivery rate of the fuel pump comprises the step of increasing the delivery rate of the fuel pump in response to a detected pressure drop in the second fuel flow path. 21. The method of claim 20 wherein said step of changing the delivery rate of the fuel pump comprises the step of decreasing the delivery rate of the fuel pump in response to a detected pressure rise in the second fuel flow path. 22. The method of claim 18 wherein said step of changing the output of the fuel pump in response to detected pressure changes comprises the step of shifting a piston in a cylinder. 23. The method of claim 22 including the additional steps of providing a control valve in the second flow path, subjecting a first end of the piston to a first pressure related to the position of the control valve and subjecting a second end of the piston to a second pressure. 24. The method of claim 23 wherein said step of subjecting a second end of the piston to a second pressure comprises the step of subjecting the second end of the piston to a second pressure related to the position of the control valve. 25. A fuel control system for supplying a flow of fuel to a gas turbine engine comprising: a variable delivery fuel pump having an inlet and an outlet;a first flow path carrying a flow of burn fuel from the fuel pump outlet toward the engine;a metering valve coupled to receive the flow of burn fuel;a proportional bypass valve connected between a first point upstream of said metering valve and a second point downstream of said metering valve for maintaining a substantially constant pressure drop across said metering valve;a second flow path carrying fuel from said first flow path to said fuel pump inlet; anda pump control for controlling the output of said variable delivery fuel pump to maintain a fuel flow along said second flow path at a substantially constant rate independent of the pressure drop across said metering valve. 26. The fuel control system of claim 25 including a control valve in said second flow path between said proportional bypass valve and said inlet. 27. The fuel control system of claim 26 wherein said control valve is operably connected to said variably delivery fuel pump. 28. The fuel control system of claim 27 wherein said variable delivery fuel pump comprises a variable delivery positive displacement fuel pump. 29. The fuel control system of claim 26 including a pressure relief valve in said second flow path downstream of said control valve. 30. The fuel control system of claim 26 including a member shiftable to control the delivery rate of said variable delivery fuel pump and a first control flow path from a first portion of said control valve to a first portion of said member. 31. The fuel control system of claim 30 including a second control flow path from a second portion of said control valve to a second portion of said member. 32. A fuel control system for supplying a flow of fuel to a gas turbine engine comprising: pump means having an inlet and an outlet;a first flow path carrying fuel from the pump means outlet toward the engine;metering means disposed in said first flow path and having a substantially constant pressure drop there-across;a second flow path carrying fuel from said first flow path to said pump means inlet; andcontrol means for controlling the output of said pump means to maintain a fuel flow along said second flow path at a substantially constant rate independent of the pressure drop across the metering means. 33. A fuel delivery system for delivering fuel to a gas turbine engine comprising: a fuel pump delivering fuel at a variable delivery rate and having a fuel pump inlet and a fuel pump outlet;a first fuel path from said fuel pump outlet to the engine;a metering valve in said first fuel path;a proportional bypass valve connected between a first point in said first fuel path upstream of said metering valve and a second point in said first fuel path downstream of said metering valve for maintaining a substantially constant pressure drop across said metering valve;a surplus fuel path from said proportional bypass valve to said fuel pump inlet;a pump control for varying the delivery rate of said fuel pump, said pump control comprising a member having a first side and a second side, a first pressure line in fluid communication with said first side, and a second pressure line in fluid communication with said second side, said member responsive to variations in fuel pressures in said first and second pressure lines to move in a first direction and a second direction to thereby increase and decrease, respectively, the delivery rate; anda control valve in said surplus fuel path for controlling said pump control in response to pressure changes in said surplus fuel path, said control valve movable, from a steady state position, in a first direction and a second direction, said control valve comprising, a first inlet port in fluid communication with said first fuel path, a second inlet port in the surplus fuel path through which surplus fuel flows to said fuel pump inlet, a first control pressure output port in fluid communication with said first pressure line, and a second control pressure output port in fluid communication with said second pressure line,wherein: when said control valve is in the steady state position, said first and second control pressure output ports are both fluidly isolated from said first and second inlet ports,when said control valve moves from the steady state position in the first direction, said first control pressure output port is in fluid communication with said second inlet port, and said second control pressure port is in fluid communication with said first inlet port, andwhen said control valve moves from the steady state position in the second direction, said first control pressure output port is in fluid communication with said first inlet port, and said second control pressure port is in fluid communication with said second inlet port. 34. A fuel delivery system for delivering fuel to a gas turbine engine comprising: a fuel pump delivering fuel at a variable delivery rate and having a fuel pump inlet and a fuel pump outlet;a first fuel path from said fuel pump outlet to the engine;a metering valve in said first fuel path;a proportional bypass valve connected between a first point in said first fuel path upstream of said metering valve and a second point in said first fuel path downstream of said metering valve for maintaining a substantially constant pressure drop across said metering valve;a surplus fuel path from said proportional bypass valve to said fuel pump inlet;a pump control for varying the delivery rate of said fuel pump, said pump control comprising a member having a first side and a second side, a first pressure line in fluid communication with said first side and said first fuel path, and a second pressure line in fluid communication with said second side and said first fuel path, said member responsive to variations in fuel pressures in said first and second pressure lines to move in a first direction and a second direction to thereby increase and decrease, respectively, the delivery rate; anda control valve in said surplus fuel path for controlling said pump control in response to pressure changes in said surplus fuel path, said control valve movable in a first direction and a second direction, said control valve comprising, a first inlet port in fluid communication with said first pressure line and said first fuel path, a second inlet port in fluid communication with said second pressure line and said first fuel path, a third inlet port in the surplus fuel path through which surplus fuel flows to said fuel pump inlet, an outlet passage in fluid communication with said first inlet port, said second inlet port, and said fuel pump inlet,wherein movement of said control valve in said first and second directions varies fuel flow through said first and second inlet ports, and thereby varies the fluid pressures in said first and second pressure lines. 35. A fuel delivery system for delivering fuel to a gas turbine engine comprising: a fuel pump delivering fuel at a variable delivery rate and having a fuel pump inlet and a fuel pump outlet;a first fuel path from said fuel pump outlet to the engine;a metering valve in said first fuel path;a proportional bypass valve connected between a first point in said first fuel path upstream of said metering valve and a second point in said first fuel path downstream of said metering valve for maintaining a substantially constant pressure drop across said metering valve;a surplus fuel path from said proportional bypass valve to said fuel pump inlet;a pump control for varying the delivery rate of said fuel pump, said pump control comprising a member having a first side and a second side, a first pressure line in fluid communication with said first side and said fuel pump inlet, and a second pressure line in fluid communication with said second side and said fuel pump inlet, said member responsive to variations in fuel pressures in said first and second pressure lines to move in a first direction and a second direction to thereby increase and decrease, respectively, the delivery rate; anda control valve in said surplus fuel path and movable in a first direction and a second direction for controlling said pump control in response to pressure changes in said surplus fuel path, said control valve comprising a first inlet port in fluid communication with said first fuel path, a second inlet port in the surplus fuel path through which surplus fuel flows to said fuel pump inlet, a first control pressure output port in fluid communication with said first pressure line and said fuel pump inlet, and a second control pressure output port in fluid communication with said second pressure line and said fuel pump inlet,wherein movement of said control valve in said first and second directions varies fuel flow through said first and second control pressure output ports, and thereby varies fuel pressures in said first and second pressure lines.

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Method and system for fuel control in a gas turbine engine

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Method and system for fuel control in a gas turbine engine

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