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US 9,422,898 B2Granted
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
Estimating the term…
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.
Claims17
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 substantially constant 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;
- and commanding a solenoid activated check valve at an inlet of the direct injection fuel pump to a pass-through state during the direct injection fuel pump compression stroke.
A method of operating a fuel pump, comprising:
- regulating a pressure in a compression chamber of a direct injection fuel pump to a single substantially constant 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, a 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 activated check valve and biased to regulate pressure in the compression chamber at a single pressure greater than a pressure fuel is supplied to the direct injection fuel pump;
- and
- a controller including instructions to operate the solenoid activated check valve in a pass-through mode during deceleration of a vehicle.
Dependencies are inferred from the claim text.