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

摘要

A method for the direct injection of fuel into an internal combustion engine, wherein 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; the mechanical actuation of the high-pressure pump is timed so that each injection interval is located at the beginning of a respective choking action; and each pump stroke is choked by at least an angular interval having a duration no shorter than that of the injection intervals irrespective of the quantity of fuel to be supplied to the common rail in such a way that the injection phase of each injector always takes place when the high-pressure pump is not pumping fuel to the common rail.