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US 6,866,025 B1Granted
High pressure fuel pump delivery control by piston deactivation
AssigneeSiemens VDO Automotive Corporation
InventorMartin Maass
Life of this patent
Estimating the term…
Abstract
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.
Claims35
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 more elements
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.
2 more elements
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.
2 more elements
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.
2 more elements
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.
2 more elements
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.
1 more element
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.
4 more elements
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.
4 more elements
Dependencies are inferred from the claim text.