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US 11,401,883 B2Granted
System and method for direct injection fuel pump control
AssigneeFord Global Technologies, LLC
InventorJoshua Putman Styron
Life of this patent
Estimating the term…
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.
Claims9
A method, comprising:
- flowing fuel to a cam-driven direct injection fuel pump of an engine during an intake stroke of a single cycle of the cam-driven direct injection fuel pump, where the single cycle includes only the intake stroke and an output stroke and a total duration of the output stroke is longer than a total duration of the intake stroke;
- transitioning the cam-driven direct injection fuel pump from the intake stroke to the output stroke;
- and
- during the output stroke, 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 the total duration of the output stroke, wherein continuously reducing the flow speed of the total flow of fuel includes:
- reducing the flow speed at a first constant rate throughout a main portion of the output stroke;
- and
- reducing the flow speed at a second constant rate throughout an end ramp portion of the output stroke following the main portion, where the end ramp portion is offset from the transition of the cam-driven direct injection fuel pump from the intake stroke to the output stroke by less than half of a total duration of the single cycle.
4 more elements
Dependencies are inferred from the claim text.