Patent ID: 6668800
Filing Date: 2003-12-30
Classification: F02D,F02M

Abstract:
A fuel injection system for an internal combustion engine having at least one cylinder (3) cooperating with a piston activated to rotate a drive shaft (4); said system comprising a pump (7) having at least one pumping element (24) activated to pump high-pressure fuel; a fuel rail (6) communicating with a delivery conduit (8) of said pump (7) and for receiving the fuel so pumped; and an injector (5) communicating with said rail (6) and activated to draw a given quantity of fuel from said rail (6) and inject said quantity of fuel into said cylinder (3); said quantity varying according to instantaneous load of said engine (2); said pumping element (24) having a delivery at least equal to the maximum draw of said injector (5); said pumping element (24) being activated in pumping phase with said injector (5) to deliver said quantity of fuel to said rail before and after a top dead center position of a compression stroke of the piston in the cylinder (3) to minimize variations in fuel pressure in said rail (6).