Patent ID: 6769418
Filing Date: 2004-08-03
Classification: F02D,F02M,F02N,Y02T

Abstract:
An engine fuel system with vapor generation for cold starting, the system comprising:a fuel tank for containing a liquid fuel vaporizable at ambient air temperatures; a liquid fuel delivery portion including a liquid fuel pump connected to draw fuel from the tank and to deliver pressurized fuel through a pressure regulator and a fuel control to a liquid fuel injector for delivery to an engine intake, the pressure regulator connected to return excess fuel to the fuel pump through a return line; a fuel vapor generator including a vapor collector connected in the return line between the pressure regulator and the fuel pump and adapted to contain returning liquid fuel in a lower portion and to collect fuel vapor above the liquid fuel in an upper portion of the collector; a charging portion including a vapor storage cold start canister having inlet and outlet portions connected in a circuit, respectively, with the upper and lower portions of the vapor collector, and a vapor pump connected in the circuit and operable to conduct fuel vapors from the vapor collector into the cold start canister to charge the canister for vapor cold starting; and a vapor delivery portion including an air inlet line connected with the inlet of the canister and a vapor delivery line connected between the outlet portion of the cold start canister and an air inlet of an engine, the vapor pump being connected with the canister between the air inlet line the vapor delivery line.