Patent ID: 6748931
Filing Date: 2004-06-15
Classification: F02D,F02M,Y02T

Abstract:
A LPG fuel injection system for an internal combustion engine, including:a LPG fuel tank, a number of LPG injectors associated with the engine's cylinders, for injecting liquid LPG into these cylinders, a manifold or rail for feeding LPG to the said injectors, a line for feeding LPG from the fuel tank to the said rail, a return line for returning LPG fed in excess to the injectors back to the fuel tank, sensors for the level of LPG in the fuel tank, a pump immersed in the fuel tank for delivering LPG via the LPG fuel line, and an electric motor driving the pump, wherein the said system includes electronic means of control for the electric motor driving the pump, as well as a pressure and/or temperature sensor inside the fuel tank, and by the fact that the said electronic means of control are programmed to: keep the pump constantly running when the temperature in the fuel tank is below 0Â° C. or above 80Â° C., realize a chopper control on the voltage supply to the electric motor driving the pump when the temperature in the fuel tank is between 0Â° C. and 80Â° C.