Series plus parallel metering pressure regulation system for a thermal efficient fuel metering system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F17D-001/00
F02M-037/00
출원번호
US-0946096
(2013-07-19)
등록번호
US-9334840
(2016-05-10)
발명자
/ 주소
Baker, Carthel C.
출원인 / 주소
Woodward, Inc.
대리인 / 주소
Reinhart Boerner Van Deuren P.C.
인용정보
피인용 횟수 :
0인용 특허 :
1
초록▼
An engine fuel system and methods are provided. The engine fuel system includes a supply arrangement for providing an outlet flow of fuel to a bypass metering arrangement. The bypass metering arrangement in turn provides a metered flow of fuel to a parallel metering system including a primary regula
An engine fuel system and methods are provided. The engine fuel system includes a supply arrangement for providing an outlet flow of fuel to a bypass metering arrangement. The bypass metering arrangement in turn provides a metered flow of fuel to a parallel metering system including a primary regulated circuit and one or more secondary metering circuits. The bypass metering arrangement is operable to maintain a substantially constant pressure differential across a fuel metering valve thereof, as well as provide the metered flow of fuel in response to downstream pressure demands of the parallel metering system.
대표청구항▼
1. An engine fuel system, comprising: a supply arrangement including at least one pump for providing an outlet flow of fuel;a bypass metering system in fluid communication with the supply arrangement and including a fuel metering valve and a bypass regulator in fluid communication with an inlet of t
1. An engine fuel system, comprising: a supply arrangement including at least one pump for providing an outlet flow of fuel;a bypass metering system in fluid communication with the supply arrangement and including a fuel metering valve and a bypass regulator in fluid communication with an inlet of the fuel metering valve and an inlet of the at least one pump, the bypass regulator operable to bypass at least a portion of the outlet flow of fuel from the at least one pump back to the inlet of the at least one pump;a parallel metering system including a primary regulated circuit and at least two secondary metering circuits arranged in parallel with the primary regulated circuit, the parallel metering system in fluid communication with the bypass metering system such that it receives a metered flow of fuel from the fuel metering valve of the bypass metering system, wherein each of the at least two secondary metering circuits includes a throttling valve; andwherein the primary regulated circuit includes a primary pressure regulator that is operably connected to the primary regulated circuit and the at least two secondary metering circuits to detect a pressure in the primary regulated circuit and a pressure downstream from the throttling valve of each of the at least two secondary metering circuits. 2. The engine fuel system of claim 1, wherein the at least one pump of the supply arrangement is a positive displacement pump. 3. The engine fuel system of claim 1, wherein the at least one pump of the supply arrangement includes two pumps in parallel with one another. 4. The engine fuel system of claim 3, further comprising a pump switching system operably connected to each of the two pumps, the pump switching system operable to combine or switch between outlet flows from each of the two pumps to provide the outlet flow of the supply arrangement. 5. The engine fuel system of claim 4, wherein the two pumps are positive displacement pumps. 6. The engine fuel system of claim 1, wherein the bypass regulator is operably connected to an outlet of the fuel metering valve of the bypass metering system to detect a pressure of the metered flow of fuel from the fuel metering valve. 7. The engine fuel system of claim 1, further comprising a pressurizing and shutoff valve arranged such that the metered flow of fuel from fuel metering valve is directed through the pressurizing and shutoff valve prior to being received by the parallel metering system. 8. An engine fuel system, comprising: a supply arrangement including at least one pump for providing an outlet flow of fuel;a bypass metering system in fluid communication with the supply arrangement and including a fuel metering valve and a bypass regulator in fluid communication with an inlet of the fuel metering valve and an inlet of the at least one pump, the bypass regulator operable to bypass at least a portion of the outlet flow of fuel from the at least one pump back to the inlet of the at least one pump;a parallel metering system including a primary regulated circuit and at least two secondary metering circuits arranged in parallel with the primary regulated circuit, the parallel metering system in fluid communication with the bypass metering system such that it receives a metered flow of fuel from the fuel metering valve of the bypass metering system;wherein the primary regulated circuit includes a primary pressure regulator that is operably connected to the primary regulated circuit and the at least two secondary metering circuits to detect a pressure in each of the primary and at least two secondary metering circuits; andwherein the at least two secondary metering circuits each include a throttling valve and a fuel metering valve regulated by said throttling valve. 9. An engine fuel system, comprising: a supply arrangement including at least one pump for providing an outlet flow of fuel;a bypass metering system in fluid communication with the supply arrangement and including a fuel metering valve and a bypass regulator in fluid communication with an inlet of the fuel metering valve and an inlet of the at least one pump, the bypass regulator operable to bypass at least a portion of the outlet flow of fuel from the at least one pump back to the inlet of the at least one pump;a parallel metering system including a primary regulated circuit and at least two secondary metering circuits arranged in parallel with the primary regulated circuit, the parallel metering system in fluid communication with the bypass metering system such that it receives a metered flow of fuel from the fuel metering valve of the bypass metering system;wherein the primary regulated circuit includes a primary pressure regulator that is operably connected to the primary regulated circuit and the at least two secondary metering circuits to detect a pressure in each of the primary and at least two secondary metering circuits; andwherein the at least two secondary metering circuits each include a fuel metering valve and a throttling valve operably connected to an inlet and an outlet of the fuel metering valve to maintain a substantially constant pressure differential across the fuel metering valve. 10. The engine fuel system of claim 9, wherein the primary pressure regulator is operably connected to the at least two secondary metering circuits downstream from the throttling valve. 11. An engine fuel system, comprising: a supply arrangement including at least one pump for providing an outlet flow of fuel;a bypass metering system in fluid communication with the supply arrangement and including a fuel metering valve and a bypass regulator in fluid communication with an inlet of the fuel metering valve and an inlet of the at least one pump, the bypass regulator operable to bypass at least a portion of the outlet flow of fuel from the at least one pump back to the inlet of the at least one pump;a parallel metering system including a primary regulated circuit and at least two secondary metering circuits arranged in parallel with the primary regulated circuit, the parallel metering system in fluid communication with the bypass metering system such that it receives a metered flow of fuel from the fuel metering valve of the bypass metering system;wherein the primary regulated circuit includes a primary pressure regulator that is operably connected to the primary regulated circuit and the at least two secondary metering circuits to detect a pressure in each of the primary and at least two secondary metering circuits; andwherein the at least two secondary metering circuits include a fuel metering valve and a head regulator operably connected to an inlet and an outlet of the fuel metering valve, and further comprise a throttling valve connected to the outlet of the fuel metering valve and the head regulator to maintain a substantially constant pressure differential across the fuel metering valve. 12. An engine fuel system, comprising: a supply arrangement including at least one pump for providing an outlet flow of fuel;a bypass metering system in fluid communication with the supply arrangement and including a fuel metering valve and a bypass regulator in fluid communication with an inlet of the fuel metering valve and an inlet of the at least one pump and operably connected to an outlet of the fuel metering valve to detect a pressure at the outlet of the fuel metering valve, the bypass regulator operable to maintain a substantially constant pressure differential across the fuel metering valve;a parallel metering system including a primary regulated circuit and at least two secondary metering circuits arranged in parallel with the primary regulated circuit, the parallel metering system in fluid communication with the bypass metering system such that it receives a metered flow of fuel from the fuel metering valve of the bypass metering system; andwherein the primary regulated circuit includes a primary pressure regulator that is operably connected to the primary regulated circuit and the at least two secondary metering circuits to detect a pressure in each of the primary and at least two secondary metering circuits, the primary pressure regulator operable to set an inlet side pressure of the primary pressure regulator at least as high as a highest one of the detected pressures of the primary and at least two secondary metering circuits, plus a regulated pressure value of the primary pressure regulator. 13. The engine fuel system of claim 12, wherein the bypass regulator is operable to bypass a portion of the outlet flow of fuel from the at least one pump back to the inlet of the at least one pump. 14. The engine fuel system of claim 13, wherein the fuel metering valve is operable to adjust the metered flow of fuel in response to a change in the inlet side pressure of the primary pressure regulator. 15. The engine fuel system of claim 12, wherein the at least one pump of the supply arrangement includes two pumps, each of which is a positive displacement pump, and further comprising a pump switching system operably connected to each of the two pumps, the pump switching system operable to combine or switch between outlet flows from each of the two pumps to provide the outlet flow of the supply arrangement. 16. The engine fuel system of claim 12, wherein each of the at least two secondary metering circuits includes a fuel metering valve and a throttling valve operably connected to an inlet and an outlet of the fuel metering valve to maintain a substantially constant pressure differential across the fuel metering valve. 17. The engine fuel system of claim 12, wherein each of the at least two secondary metering circuits includes a fuel metering valve and a head regulator operably connected to an inlet and an outlet of the fuel metering valve, and further comprises a throttling valve connected to the outlet of the fuel metering valve and the head regulator to maintain a substantially constant pressure differential across the fuel metering valve. 18. A method for managing a flow of fuel in an engine fuel system having a parallel metering system that includes a primary regulated circuit and at least two secondary metering circuits, the method comprising the steps of: providing a metered flow of fuel to the parallel metering circuit, the metered flow of fuel divided between the primary regulated circuit and at least two secondary metering circuits, wherein each of the at least two secondary metering circuits includes a throttling valve;detecting, with a primary pressure regulator of the primary regulated circuit, a downstream pressure of the primary regulated circuit and a downstream pressure of each of the at least two secondary metering circuits, the downstream pressure of each of the at least two secondary metering circuits downstream from the throttling valve of each of the at least two metering circuits;adjusting an inlet side pressure of the primary pressure regulator to be at least as high as a highest one of the detected downstream pressures of the primary regulated circuit and the at least two secondary metering circuits, plus a regulated pressure value of the primary pressure regulator;detecting, with a bypass regulator of a bypass metering system in fluid communication with the parallel metering system, the adjusted inlet side pressure of the primary pressure regulator; andadjusting an inlet pressure of a flow of fuel to a fuel metering valve of the bypass metering system using the bypass regulator to maintain a substantially constant pressure differential across the fuel metering valve. 19. The method of claim 18, further comprising the step of adjusting an outlet flow of fuel from the fuel metering valve in response to the adjusted inlet side pressure of the primary pressure regulator. 20. The method of claim 18, further comprising the step of bypassing a portion of an outlet flow of fuel from a positive displacement pump back to an inlet of the positive displacement pump.
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