System and method for operating an engine combusting liquefied petroleum gas

摘要

A method and system for operating an engine that is supplied a fuel having a low super critical temperature is presented. In one example, the method supplies excess fuel to a direct injection fuel rail to cool a portion of the fuel system that is near direct fuel injectors. The heat is drawn from the direct injection fuel rail to a fuel tank where the heat is removed via injecting fuel vapors to the engine.

主权项

1. A method for operating an engine, comprising:
supplying liquefied petroleum gas (LPG) in a liquid phase directly into a cylinder of an engine in response to a temperature of a fuel system being less than a threshold level; and ceasing to supply LPG directly into the cylinder and supplying LPG into an intake port of the cylinder in response to the temperature of the fuel system being greater than the threshold level.