Method and system for the direct injection of fuel into an internal combustion engine

摘要

A method and system for the direct injection of fuel into an internal combustion engine, according to which a high-pressure pump with a variable flow rate supplies the fuel to a common rail, which in turn supplies the fuel to a series of injectors; the flow rate of the high-pressure pump is controlled by choking each pump stroke by varying the closure time of an intake valve of said high-pressure pump; for each pump stroke of the high-pressure pump, at least one intermediate gap is generated in said pump stroke during which the pumping pressure is substantially reduced to zero so as to subdivide symmetrically the choking of the pump stroke into a first choking action at the beginning of the pump stroke and a second choking action immediately after the intermediate gap.