IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0442977
(1999-11-18)
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발명자
/ 주소 |
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출원인 / 주소 |
- Siemens VDO Automotive Corp.
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인용정보 |
피인용 횟수 :
5 인용 특허 :
15 |
초록
▼
A high pressure piston pump includes a housing having a low pressure fuel inlet and a high pressure fuel outlet; at least two pistons disposed in the housing; a driveshaft for supplying power to drive the at least two pistons; and a bypass valve fluidly connected to at least one of the at least two
A high pressure piston pump includes a housing having a low pressure fuel inlet and a high pressure fuel outlet; at least two pistons disposed in the housing; a driveshaft for supplying power to drive the at least two pistons; and a bypass valve fluidly connected to at least one of the at least two pistons to deactivate the at least one piston. A method of varying the flow output of a high pressure piston pump having at least two pistons includes deactivating at least one of the two pistons by directing fluid displaced by the at least one piston to a bypass valve.
대표청구항
▼
1. A high pressure piston pump, comprising:a housing having a low pressure fuel inlet and a high pressure fuel outlet; at least two pistons disposed in the housing; a driveshaft for supplying power to drive the at least two pistons; and a bypass valve fluidly connected to one of the at least two pis
1. A high pressure piston pump, comprising:a housing having a low pressure fuel inlet and a high pressure fuel outlet; at least two pistons disposed in the housing; a driveshaft for supplying power to drive the at least two pistons; and a bypass valve fluidly connected to one of the at least two pistons to deactivate the one piston, wherein the piston to which the bypass valve is connected to has a surface area that is different than a surface area of the other piston of the at least two pistons, and the at least two pistons include respective surface areas reciprocating on a common plane generally orthogonal to the driveshaft. 2. The high pressure piston pump of claim 1 wherein the bypass valve includes a solenoid for opening and closing the bypass valve.3. The high pressure piston pump of claim 2 wherein the bypass valve is normally open such that the at least one piston is normally deactivated.4. A high pressure piston pump, comprising:a housing having a low pressure fuel inlet and a high pressure fuel outlet; three pistons disposed in the housing; a driveshaft for supplying power to drive the three pistons; and a bypass valve fluidly connected to at least one of the three pistons to deactivate the at least one piston, wherein the bypass valve is fluidly connected to only one of the three pistons, and wherein the piston to which the bypass valve is connected to has a surface area that is different than a surface area of the other pistons. 5. A high pressure piston pump, comprising:a housing having a low pressure fuel inlet and a high pressure fuel outlet; at least two pistons disposed in the housing; a driveshaft that drives the at least two pistons; and a bypass valve fluidly connected to one of the at least two pistons to deactivate the one piston, wherein the piston to which the bypass valve is connected to has a surface area that is larger than a surface area of the other piston of the at least two pistons, and the at least two pistons comprise respective surface areas reciprocating on a common plane generally orthogonal to the driveshaft. 6. The high pressure piston pump of claim 5 wherein a surface area of the piston to which the bypass valve is connected is approximately twice the surface area of each of the other two pistons.7. The high pressure piston pump of claim 2 wherein the solenoid is activated by a signal from an engine electronic control unit.8. The high pressure piston pump of claim 1 wherein the high pressure piston pump is a radial type piston pump.9. The high pressure piston pump of claim 8 wherein the driveshaft includes a cam portion for driving the at least two pistons.10. A high pressure radial type piston pump, comprising:a housing having a low pressure fuel inlet and a high pressure fuel outlet; three pistons disposed in the housing; a driveshaft for supplying power to drive the three pistons; and a bypass valve fluidly connected to one of the three pistons to deactivate the one piston, wherein the piston to which the bypass valve is connected to has a surface area that is different than a surface area of each of the other pistons. 11. The high pressure radial type piston pump of claim 10 wherein the bypass valve includes a solenoid for opening and closing the bypass valve.12. A high pressure radial type piston pump, comprising:a housing having a low pressure fuel inlet and a high pressure fuel outlet; three pistons disposed in the housing; a driveshaft that drives the three pistons; and a bypass valve fluidly connected to one of the three pistons to deactivate the one piston, wherein the bypass valve is normally open, the bypass valve permitting fluid to flow through the bypass valve when the valve is not actuated such that the one piston is normally deactivated. 13. The high pressure radial type piston pump of claim 10, wherein the one piston to which the bypass valve is connected has a surface area that is larger than a surface area of each of the other two pistons.14. The high pressure radial type piston pump of claim 13, wherein a surface area of the one piston to which the bypass valve is connected is approximately twice the surface area of each of the other two pistons.15. The high pressure radial type piston pump of claim 11 wherein the solenoid is activated by a signal from an engine electronic control unit.16. The high pressure piston pump of claim 10 wherein the driveshaft includes a cam portion for driving the three pistons.17. A method of varying the flow output of a high pressure piston pump having at least two pistons comprising:pumping fluid by a first piston of the at least two pistons, the first piston having a first surface area; pumping fluid by a second piston of the at least two pistons, the second piston having a second surface area different from the first surface area; and deactivating one of the at least two pistons wherein the one piston is deactivated by directing fluid displaced by the one piston to a normally open bypass valve that permits fluid to flow through the valve when the valve is not actuated. 18. The method of claim 17 wherein the bypass valve directs the fluid to a low pressure area of the pump.19. The method of claim 17 wherein the fluid displaced by the at least one piston is fuel for the engine.20. The method of claim 19 wherein the fluid displaced by the at least one piston is hydraulic oil.21. The method of claim 17 further comprising closing the bypass valve to reactivate the at least one deactivated piston.22. A high pressure fuel injection system, comprising:a source of fuel; a low pressure pump; a high pressure piston pump, the low pressure pump being disposed between the fuel source and the high pressure piston pump; a fuel rail including a plurality of fuel injectors, the high pressure piston pump being disposed between the low pressure pump and the fuel rail; and a fuel return line connecting the fuel rail to a low pressure side of the high pressure pump; wherein the high pressure piston pump comprises a housing having a low pressure fuel inlet connected to an output of the low pressure pump, a high pressure fuel outlet connected to an input of the fuel rail, at least two pistons disposed in the housing, and a bypass valve fluidly connected to one of the at least two pistons to deactivate the one piston, and wherein the one piston to which the bypass valve is connected to has a surface area that is different than a surface area of the other piston of the at least two pistons. 23. The high pressure fuel injection system of claim 22 further comprising a pressure sensor connected to the fuel rail.24. The high pressure fuel injection system of claim 23 further comprising a pressure regulator connected to the fuel rail.25. The high pressure fuel injection system of claim 22 wherein the high pressure piston pump is a radial type piston pump.26. The high pressure fuel injection system according to claim 22, wherein the bypass valve includes a normally open valve that permits fluid to flow through the valve when the valve is not actuated.27. The high pressure fuel injection system according to claim 26, wherein the bypass valve includes a solenoid adapted to open and close the bypass valve.28. A high pressure fuel injection system, comprising:a source of fuel; a low pressure pump; a high pressure piston pump, the low pressure pump being disposed between the fuel source and the high pressure piston pump; a fuel rail including a plurality of fuel injectors, the high pressure piston pump being disposed between the low pressure pump and the fuel rail; and a fuel return line connecting the fuel rail to a low pressure side of the high pressure pump; wherein the high pressure piston pump comprises a housing having a low pressure fuel inlet connected to an output of the low pressure pump, a high pressure fuel outlet connected to an input of the fuel rail, at least two pistons disposed in the housing, and a normally open bypass valve fluidly connected from a discharge passage of one of the at least two pistons to a low pressure side passage of the one piston so as to deactivate the one piston. 29. The high pressure piston pump of claim 5, wherein the bypass valve includes a solenoid for opening and closing the bypass valve.30. The high pressure piston pump of claim 29, wherein the bypass valve is normally open, the bypass valve permitting fluid to flow through the bypass valve when the valve is not actuated such that the at least one piston is normally deactivated.31. The high pressure radial type piston pump of claim 12, wherein the bypass valve includes a solenoid for opening and closing the bypass valve.32. The high pressure radial type piston pump of claim 12, wherein the one piston to which the bypass valve is connected has a surface area that is larger than a surface area of each of the other two pistons.33. The high pressure radial type piston pump of claim 32, wherein a surface area of the one piston to which the bypass valve is connected to is approximately twice the surface area of each of the other two pistons.34. The high pressure radial type piston pump of claim 31, wherein the solenoid is activated by a signal from an engine electronic control unit.35. The high pressure radial type piston pump of claim 12, wherein the driveshaft includes a cam portion that drives the three pistons.
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