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US 2014/0224217 A1Published application
Direct injection fuel pump
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Joseph Norman Ulrey, Gopichandra Surnilla, Joseph F. Basmaji, Mark Meinhart
Life of this patent
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Abstract
Methods and systems are provided for a direct injection fuel pump. The methods and system control pressure within a compression chamber so as to improve fuel pump lubrication.
Claims20
A method of operating a direct injection fuel pump, comprising:
- regulating a pressure in a compression chamber of the direct injection fuel pump to a single pressure during a direct injection fuel pump compression stroke, the pressure greater than an output pressure of a low pressure pump supplying fuel to the direct injection fuel pump.
A method of operating a fuel pump, comprising:
- regulating a pressure in a compression chamber of the direct injection fuel pump to a single pressure during direct injection fuel pump compression and suction strokes, the pressure greater than an output pressure of a low pressure pump supplying fuel to the direct injection fuel pump.
A direct injection fuel pump system, comprising:
- a direct injection fuel pump including a piston, compression chamber, a cam for moving the piston, a solenoid activated check valve positioned at an inlet of the direct injection fuel pump, and a pressure relief valve positioned upstream of the solenoid actuated check valve and biased to regulate pressure in the compression chamber.
Dependencies are inferred from the claim text.