Patent ID: 8439016
Filing Date: 2013-05-14
Classification: F02D,F02M,Y02T

Abstract:
1. A liquefied petroleum gas (LPG) fuel assembly comprising: a fuel rail having an inlet in communication with a pressurized LPG fuel source, a fuel injection passageway in communication with the inlet and a fuel injector that provides fuel to a combustion chamber of an engine, and an outlet in communication with the fuel injection passageway; and a flow control mechanism including a variable orifice in communication with the outlet of the fuel rail and a LPG fuel tank and operable in a first mode when a temperature in the fuel rail is greater than a threshold temperature that indicates a fuel transition from a liquid state to a vapor state and a second mode when the temperature in the fuel rail is less than or equal to the threshold temperature, the first mode provides purging of LPG fuel from the fuel rail by opening the variable orifice valve beyond a predetermined amount and the second mode providing a greater flow restriction than the first mode to control a fuel flow from the outlet of the fuel rail to the fuel tank and the variable orifice providing an adjustable restriction during the second mode to achieve a pressure in the fuel rail that maintains LPG fuel flowing through the fuel rail in a liquid state.