Patent ID: 7263979

Claim:
A high-pressure pump with a device for regulation of the flow rate for a fuel-injection system of an internal-combustion engine, comprising: at least one pumping element, which is actuated with reciprocating motion through corresponding suction and delivery strokes and is provided with a corresponding intake valve in communication with an intake pipe, and a corresponding delivery valve in communication with an accumulation volume of pressurized fuel; and said regulation device of said pump comprises at least one on-off solenoid valve for shutting off the fuel supplied to said pumping element, said solenoid valve being set on said intake pipe and being actuated during the suction strokes of said pumping element with a certain delay with respect to the start of the suction strokes themselves, wherein opening of said solenoid valve occurs at a point corresponding to an intermediate part (Tstart-Tend) of each suction stroke of said pumping element, and wherein said intermediate part (Tstart-Tend) is obtained by varying both the instant of start (Tstart) and the instant of end (Tend) of opening of said solenoid valve.