Method of controlling a fuel supply system of an engine of a motor vehicle
AssigneeFord Global Technologies, LLC
InventorsStuart Lane, Donatus Andreas Josephine Kees
Life of this patent
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Abstract
A method of controlling a fuel supply system of an engine 10 of a motor vehicle 50 is disclosed in which an engine driven variable output high pressure fuel pump is operated at a high demand level to charge a high pressure fuel accumulator with fuel during a shutdown of the engine and, during a subsequent start-up of the engine, use fuel from the accumulator while operating the high pressure fuel pump at a low demand level. This reduces the fuel consumption of the engine by using kinetic energy from the slowing engine to drive the high pressure fuel pump and increases the deceleration of the engine.
Claims20
A method of controlling an engine fuel supply system, comprising:
- during a shutdown of the engine, operating an engine driven variable output high pressure fuel pump at a high demand level and storing fuel from the high pressure fuel pump in a fuel accumulator and, during a subsequent engine start-up, operating the high pressure fuel pump at a low demand level and supplying fuel from the accumulator to the engine.
A fuel supply system of an engine of a motor vehicle comprising:
- an engine driven variable output high pressure fuel pump, a fuel accumulator to store fuel at high pressure, a valve means to control a flow of high pressure fuel within the system and an electronic controller to control operation of the high pressure fuel pump and the valve means, wherein the controller is operable during a shutdown of the engine, to operate the high pressure fuel pump at a high demand level and control the valve means to store fuel from the high pressure fuel pump in the fuel accumulator, and is operable, during a subsequent engine start-up, to operate the high pressure fuel pump at a low demand level and operate the valve means so that fuel from the fuel accumulator is supplied to the engine.
Dependencies are inferred from the claim text.