Patent ID: 7779815
Filing Date: 2010-08-24
Classification: F02D,F02M

Abstract:
1. A fuel injection system for an internal combustion engine, comprising: a variable flow rate high-pressure pump having at least one pumping element operable to perform intake and discharge strokes in a reciprocating manner, at an activation frequency that is based on engine revolutions speed, said pumping element having an intake valve in fluid communication with an intake line and a delivery valve in fluid communication with a delivery line; a throttle device to control a flow rate of the pump including a metering solenoid valve positioned on said intake line to meter the quantity of fuel supplied to said pumping element; and a control unit in electronic communication with said solenoid valve, the control unit programmed to calculate a number equal to a whole multiple or submultiple of the activation frequency of said pumping element that is multiplied by a factor other than 1, the factor being between 0.90 and 1.10, inclusive. the control unit transmitting a signal to operate said solenoid valve at a frequency equal to the calculated number, during the intake stroke of said pumping element.