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US 2021/0310437 A1Published application
System and method for direct injection fuel pump control
AssigneeFord Global Technologies, LLC
InventorJoshua Putman Styron
Life of this patent
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Abstract
Methods and systems are provided for vehicle direct injection fuel pump control. In one example, a method may include reducing a flow speed of fuel from a cam-driven direct injection fuel pump for at least half of a total duration of an output stroke of the fuel pump. A cam driving the fuel pump may reduce the flow speed at a first rate during a main portion of the output stroke, and the cam may reduce the flow speed at a second rate during an end ramp portion of the output stroke.
Claims20
A method, comprising:
- during an output stroke of a cam-driven direct injection fuel pump of an engine, maintaining a drive speed of the cam-driven direct injection fuel pump while continuously reducing a flow speed of a total flow of fuel from the cam-driven direct injection fuel pump for at least half of a total duration of the output stroke.
A method, comprising:
- driving a plunger of a direct injection fuel pump of an engine via a cam of a camshaft;
- and
- while driving the plunger during an output stroke of the direct injection fuel pump, reducing a speed of the plunger at both of a main portion and an end ramp portion of the output stroke while maintaining a rotation rate of the cam.
A system, comprising:
- a direct injection fuel pump including a solenoid valve;
- a cam driven by a camshaft and engaged with a plunger of the direct injection fuel pump;
- a fuel rail fluidly coupling the direct injection fuel pump to a fuel injector;
- and
- a controller including instructions stored in non-transitory memory that when executed, cause the controller to:
- adjust a duty cycle of the solenoid valve responsive to a speed of the plunger while the plunger is driven by a rotation of the cam and the speed of the plunger decreases for at least half of each output stroke of the direct injection fuel pump.
3 more elements
Dependencies are inferred from the claim text.