IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0193138
(2008-08-18)
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등록번호 |
US-8348630
(2013-01-08)
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발명자
/ 주소 |
- Tysver, John D.
- Baker, Carthel C.
- Kleckler, Joel W.
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출원인 / 주소 |
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대리인 / 주소 |
Reinhart Boerner Van Deuren P.C.
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인용정보 |
피인용 횟수 :
2 인용 특허 :
9 |
초록
▼
A common regulator valve is provided for a variable displacement pump fuel metering scheme in which the common regulator valve both controls working output to a pump actuator to control displacement of the variable displacement pump and also to control bypass of excess fuel flow. The regulator valve
A common regulator valve is provided for a variable displacement pump fuel metering scheme in which the common regulator valve both controls working output to a pump actuator to control displacement of the variable displacement pump and also to control bypass of excess fuel flow. The regulator valve also includes a differential piston which generates a compensation force off of the bypass flow in order to compensate for changes in spring force and flow reaction force at different system pressures and operational states. As a result, errors in the metered fuel flow can be either eliminated or substantially reduced.
대표청구항
▼
1. A fuel supply system, comprising: a variable displacement pump providing a high pressure fuel supply from a fuel sump;a displacement control device controlling displacement and thereby pump output of the variable displacement pump;a fuel metering valve fluidically connected to the variable displa
1. A fuel supply system, comprising: a variable displacement pump providing a high pressure fuel supply from a fuel sump;a displacement control device controlling displacement and thereby pump output of the variable displacement pump;a fuel metering valve fluidically connected to the variable displacement pump for receiving the high pressure fuel supply and metering fuel flow flowing toward a combustion chamber;a regulator valve including a valve housing and a valve element movable therein, the regulator valve having in combination a fuel bypass arranged within the valve element to bypass a portion of the high pressure fuel supply around the fuel metering valve and a working output acting upon the displacement control device, wherein movement of the valve element simultaneously regulates the fuel bypass and the working output, the moveable valve element responsive to a pressure differential across the fuel metering valve; anda compensator integrated into the regulator valve deriving a compensation force from fuel flow through the fuel bypass within the valve element, wherein a position of the moveable valve element is determined, at least in part, by the compensation force and the pressure differential across the fuel metering valve. 2. The fuel supply system of claim 1, wherein the valve element has a neutral position within the valve housing in which the fuel bypass is cracked open a predetermined amount and wherein the working output is closed. 3. The fuel supply system of claim 2, wherein displacement of the valve element from the neutral position to a fuel demand position cracks open the working output to drive the variable displacement pump toward an increased pump output; and wherein displacement of the valve element from the neutral position to a fuel reduction position cracks the working output open to drive the variable displacement pump toward a decreased pump output. 4. The fuel supply system of claim 1, wherein the fuel bypass and the working output are inversely related, wherein when fuel flow through the fuel bypass increases past a set point then the working output directs the pump output to decrease, and wherein when fuel flow through the fuel bypass decreases past the set point then the working output directs the pump output to increase. 5. The fuel supply system of claim 1, wherein the working output acts upon the displacement control device selected from the group consisting of a hydraulic actuator, a switching valve and a selector valve. 6. The fuel supply system of claim 1, wherein the valve element consists of an integral valve body. 7. The fuel supply system of claim 1, wherein the valve element consists of multiple separable valve bodies in engagement with one another. 8. The fuel supply system of claim 1, wherein the regulator valve is arranged in fluid parallel with the fuel metering valve downstream of the variable displacement pump. 9. A fuel supply system, comprising: a variable displacement pump providing a high pressure fuel supply from a fuel sump;a displacement control device controlling displacement and thereby pump output of the variable displacement pump;a fuel metering valve fluidically connected to the variable displacement pump for receiving the high pressure fuel supply and metering fuel flow flowing toward a combustion chamber;a regulator valve including a valve housing and a valve element movable therein, the regulator valve having in combination a fuel bypass arranged to bypass a portion of the high pressure fuel supply around the fuel metering valve and a working output acting upon the displacement control device, wherein movement of the valve element simultaneously regulates the fuel bypass and the working output, the moveable valve element responsive to a pressure differential across the fuel metering valve; anda compensator integrated into the regulator valve deriving a compensation force from fuel flow through the fuel bypass, wherein a position of the moveable valve element is determined, at least in part, by the compensation force and the pressure differential across the fuel metering valve; andwherein the valve element is controlled by control inputs including a higher pressure input connected upstream of the metering valve and a lower pressure input connected downstream of the metering valve, and wherein the valve element comprises a differential piston to provide the compensator including a larger piston land subject to the higher pressure input and a smaller land subject to the lower pressure input, and wherein the compensation force acts on a portion of the larger piston land in opposition to the higher pressure input. 10. The fuel supply system of claim 9, wherein a restriction providing a pressure drop is provided in the regulator valve proximate an inlet of the fuel bypass, wherein fuel in the fuel bypass is at a reduced pressure relative to the high pressure fuel supply. 11. The fuel supply system of claim 10, further comprising a spring biasing the differential piston in opposition to the higher pressure input. 12. A fuel supply system, comprising: a variable displacement pump providing a high pressure fuel supply from a fuel sump;a displacement control device controlling displacement and thereby pump output of the variable displacement pump;a fuel metering valve fluidically connected to the variable displacement pump for receiving the high pressure fuel supply and metering fuel flow flowing toward a combustion chamber;a regulator valve including a valve housing and a valve element movable therein, the regulator valve having in combination a fuel bypass arranged to bypass a portion of the high pressure fuel supply around the fuel metering valve and a working output acting upon the displacement control device, wherein movement of the valve element simultaneously regulates the fuel bypass and the working output, the moveable valve element responsive to a pressure differential across the fuel metering valve; anda compensator integrated into the regulator valve deriving a compensation force from fuel flow through the fuel bypass, wherein a position of the moveable valve element is determined, at least in part, by the compensation force and the pressure differential across the fuel metering valve; andwherein the regulator valve is arranged in fluid series with the variable displacement pump and the fuel metering valve, the regulator valve being interposed therebetween, wherein the regulator valve is adapted to bypass fuel prior to fuel metering. 13. A regulator valve for regulating fluid bypass and control of a variable displacement pump controlled by a displacement control device in a fluid system, the variable displacement pump pumping fluid from a sump to a high pressure fluid supply with a metering valve metering fluid flow of the high pressure fluid supply to generate a metered lower pressure flow, the regulator valve comprising: a valve housing having a plurality of ports including, (a) a high pressure port adapted to be fluidically connected to the high pressure fluid supply upstream of the fluid metering valve; (b) a lower pressure port adapted to be fluidically connected to the lower pressure flow; (c) a sump port adapted to be fluidically connected to the sump;a valve element movable in the valve housing, the valve element comprising a differential piston with larger and smaller control lands, one control land subject to the high pressure port and the other control land subject to the lower pressure port;a fluid bypass extending between the high pressure port and the sump port, the valve element regulating fluid flow along the fluid bypass;at least one working output port adapted for connection to the displacement control device, the valve element regulating fluid flow along the at least one working output; anda compensation port communicating pressure of the fluid bypass to a compensation chamber acting on a portion of the differential piston. 14. The regulator valve of claim 13, wherein the larger control land is subject to the high pressure port and the smaller control land is subject to the lower pressure port, and wherein the pressure of the fluid bypass via the compensation port acts upon a portion of the larger control land, and further comprising a spring biasing the valve element against the action of the high pressure port on the larger control land. 15. The regulator valve of claim 14, wherein the valve element is linearly translatable within a cylindrical chamber defined by valve housing, the cylindrical chamber including larger and smaller diameter sections, the larger control land sliding in the larger diameter section and the smaller control land sliding in the smaller diameter section, the compensation port communicating with the larger diameter section. 16. The regulator valve of claim 15, wherein the valve element defines an internal passageway therethrough to provide the fuel bypass, the compensation port being defined through the valve element member, and wherein the at least one working output port is controlled by at least one variable restriction formed by at least one corresponding control land in cooperation with the valve housing. 17. The regulator valve of claim 13, wherein the regulator valve is a three-way valve having a single working output port, the regulator valve configured to alternatively pressurize and exhaust the single working output port. 18. The regulator valve of claim 13, wherein the regulator valve is a four-way valve, the at least one working output port including a pair of cooperating output ports configured for alternatively pressurizing and exhausting passages for control of the variable displacement pump. 19. The regulator valve of claim 13, wherein the valve element consists of an integral valve body. 20. The regulator valve of claim 13, wherein the valve element consists of multiple separable valve bodies in engagement with one another. 21. The regulator valve of claim 13, wherein the valve element has a neutral position within the valve housing in which the fluid bypass is cracked open a predetermined amount and wherein the at least one working output port is closed; and wherein displacement of the valve element from the neutral position to a fuel demand position couples the at least one working output port to one of the high pressure and sump ports, and wherein displacement of the valve element from the neutral position to a fuel reduction position couples the at least one working output to a different one of the high pressure and sump ports. 22. The regulator valve of claim 21, wherein the bypass and the working output port are inversely related, wherein when fuel flow through the bypass increases past a set point then the working output port is adapted to direct pump output to decrease, and wherein when fuel flow through the bypass decreases past the set point then the working output port is adapted to direct pump output to increase. 23. A method of generating a fuel flow, comprising: pumping fuel to generate a pumped fuel flow;metering at least a portion of the pumped fuel flow;bypassing a portion of the pumped fuel flow to generate a bypass flow;controlling the pumping with a working output generated from the pumped fuel flow;assimilating the bypassing and the controlling into a common valve having a valve element;generating a compensation force from the bypass flow within the valve element; andtranslating the common valve in response to changes in pressure differential across the fuel metering valve and adjusted by the compensation force. 24. The method of claim 23, wherein the common valve includes a differential piston, and further comprising biasing the differential piston in an axial direction with a spring. 25. The method of claim 24, further comprising porting pressure of the bypass flow to a compensation chamber acting upon the differential piston. 26. The method of claim 23, wherein said metering is done by a fuel metering valve, further comprising; maintaining a substantially constant pumping when the common valve is in a neutral position;reducing the bypassing and increasing the pumping in response to a pressure drop across the fuel metering valve past a preset point; andincreasing the bypass and decreasing the pumping in response to a pressure increase across the fuel metering valve past the preset point. 27. The method of claim 24 further comprising driving an actuator with the working output, wherein the pumping is performed by a variable displacement pump, and setting the displacement of the variable displacement pump with the actuator. 28. A method of generating a fuel flow, comprising: pumping fuel to generate a pumped fuel flow;metering at least a portion of the pumped fuel flow;bypassing a portion of the pumped fuel flow to generate a bypass flow;controlling the pumping with a working output generated from the pumped fuel flow;assimilating the bypassing and the controlling into a common valve;generating a compensation force from the bypass flow; andtranslating the common valve in response to changes in pressure differential across the fuel metering valve and adjusted by the compensation force;wherein the common valve includes a differential piston, and further comprising biasing the differential piston in an axial direction with a spring;porting pressure of the bypass flow to a compensation chamber acting upon the differential piston; andporting the bypass flow through an internally formed passage of the differential piston.
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