Patent ID: 7549410
Filing Date: 2009-06-23
Classification: F02M,Y02T

Abstract:
1. A fuel injection system for an internal combustion system, comprising an Engine Management System, a fuel feed pump, a return line, a high-pressure pump supplying fuel under pressure to a common rail, a hydraulically operated valve forming an outlet chamber connected to the common rail and a control chamber, the hydraulically operated valve being designed such that, in a closed position thereof, the valve prevents flow out of the outlet chamber, an electrically operated pilot valve adapted to control a position of the hydraulically operated valve, a nozzle with a resilient member that biases the nozzle towards closing, the nozzle being connected to an outlet of the hydraulically operated valve in such a way that pressure at the outlet of the hydraulically operated valve tends to overcome a force of the resilient member and open the nozzle, and an electrically operated spill valve connected between the outlet of the hydraulically operated valve and the return line.