Patent ID: 7040293
Filing Date: 2006-05-09
Classification: F02M

Abstract:
1. A fuel injection system of an internal combustion engine for injecting a high-pressure fuel accumulated in a common rail from a plurality of injectors, wherein each of said injectors includes a high-pressure chamber for accumulating the fuel, a back pressure chamber into which the high-pressure fuel in said high-pressure chamber is introduced and a nozzle body arranged in said high pressure chamber, wherein said injector closes the fuel injection port by pushing down said nozzle body under the pressure of the high-pressure fuel introduced into said back pressure chamber on the one hand and said high-pressure fuel in said back pressure chamber is discharged through the fuel discharge path of said injector thereby to open said fuel injection port on the other hand, wherein a variable-area orifice is arranged in a common discharge path downstream of the confluences of all the fuel discharge paths from the injectors, and wherein an open area of said variable-area orifice is increased in response to an increase in fuel pressure in said common discharge path.