Fuel delivery system control strategy
AssigneeFord Global Technologies, LLC
InventorRoss D. Pursifull
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Abstract
A method for a fuel delivery system coupled to an engine is disclosed, the fuel delivery system including a lower pressure pump (LPP) fluidly coupled upstream of a higher pressure pump (HPP). The method may include during operation of both the HPP and LPP, adjusting operation of the LPP in response to pressure fluctuations at an inlet of the HPP.
Claims18
A method for a fuel delivery system coupled to an engine, the fuel delivery system including a lower pressure pump (LPP) fluidly coupled upstream of a higher pressure pump (HPP), comprising:
- during operation of both the HPP and LPP, adjusting operation of the LPP in response to pressure fluctuations at an inlet of the HPP, wherein the pressure fluctuations are fuel pressure oscillations occurring at a frequency of the higher pressure pump or a harmonic thereof, and wherein adjusting the operation of the LPP includes maintaining an output of the LPP based on an amplitude of the fuel pressure oscillations at the inlet of the HPP.
A fuel delivery system for an engine, comprising:
- a lower pressure pump fluidly coupled to a higher pressure pump;
- a fuel pressure sensor coupled to an inlet of the higher pressure pump;
- and
- a control system including a controller having code stored on memory executable via a processor, including:
- code to adjust the lower pressure pump based on a fluctuation in the fuel pressure sensor output at or above a cut-off frequency.
A method for a fuel delivery system coupled to an engine, the fuel delivery system including a lower pressure pump (LPP) fluidly coupled upstream of a higher pressure pump (HPP), comprising:
- during operation of both the HPP and LPP:
- reducing operation of the LPP;
- and
- stopping the reducing in response to an amplitude of pressure oscillations above a cut-off frequency falling below a threshold, the pressure oscillations at an inlet of the HPP.
Dependencies are inferred from the claim text.