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US 9,429,124 B2Granted
Direct injection fuel pump
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Joseph Norman Ulrey, Robin Ivo Lawther, Paul Zeng
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.
Claims11
A method for operating a direct injection fuel pump, comprising:
- while a solenoid activated check valve at an inlet of the direct injection fuel pump is commanded to a pass-through state during a direct injection fuel pump compression stroke, an accumulator located upstream of the solenoid activated check valve is in fluidic communication with a compression chamber of the direct injection fuel pump, the accumulator adding a volume to a clearance volume of the direct injection fuel pump.
A fuel system, comprising:
- a direct injection fuel pump including a piston, compression chamber, and a cam for driving the piston;
- a first solenoid activated check valve positioned at an inlet of the direct injection fuel pump for regulating fuel flow;
- a second check valve positioned upstream of the first solenoid activated check valve;
- and
- an accumulator positioned upstream of the second check valve, the accumulator adding to a clearance volume of the direct injection fuel pump.
2 more elements
Dependencies are inferred from the claim text.