VARIABLE PRESSURE FUEL INJECTION SYSTEM OF A VEHICLE

摘要

A variable pressure fuel injection system for regulating fuel pressure across an injector at different operating conditions of a vehicle is described herein. The variable pressure fuel injection system includes a fuel inlet line (102) for supplying fuel to the fuel injector (106) and to a fuel chamber (118) of a fuel pressure regulator (108). Fuel with extra pressure in the fuel chamber (118) is discharged back to a fuel tank (114) through a fuel outlet line (104). An air chamber (120) of the fuel pressure regulator (108) is hydraulically connected to a communicating device (110). The communicating device (110) acts as an air regulating valve between the air chamber (120) and an air source (112). An electronic control unit (124) controls the communicating device (110) precisely so that for different operating conditions of the vehicle, there are different magnitudes of air pressure in the air chamber (120) and hence different magnitudes of fuel pressure in the fuel chamber (118) of the fuel pressure regulator (108).