Patent ID: 7630822
Filing Date: 2009-12-08
Classification: F02M

Abstract:
1. A fuel injection system for an internal combustion engine, comprising: a fuel injection apparatus, which comprises a plunger and fuel injection nozzle, for pressurizing a low-viscosity fuel that evaporates under relatively low pressure by using said plunger of said fuel injection apparatus to feed pressurized fuel to said fuel injection nozzle, said plunger having a sliding part in said fuel injection apparatus; a fuel supply pump for supplying the low-viscosity fuel to said fuel injection apparatus; an air supply hole communicating with said sliding part of said plunger of said fuel injection apparatus; a pressurized air supply means for constantly supplying pressurized air to said sliding part of said plunger via said air supply hole; and a controller for controlling said pressurized air supply means so that the pressure of the pressurized air supplied to said sliding part of said plunger is maintained higher than the evaporation pressure of the low-viscosity fuel in said sliding part of said plunger so as to prevent the low-viscosity fuel from evaporating.