Patent ID: 6044806
Filing Date: 2000-04-04
Classification: F02B,F02D,F02M,Y02T

Abstract:
A method of detecting leakage through a gaseous fuel admission valve of a dual fuel engine capable of operating in both a liquid fuel mode and a dual fuel mode, the engine including at least one such gaseous fuel admission valve positioned between a source of gaseous fuel and an engine air intake, the engine further including a gaseous fuel shut off valve positioned between the source of gaseous fuel and the gaseous fuel admission valve, the method comprising the steps of:(a) determining a liquid fuel rate when the engine is operating in a liquid fuel mode and the gaseous fuel shut off valve is closed;(b) opening the gaseous fuel shut off valve while the engine is operating in the liquid fuel mode;(c) determining a liquid fuel rate after the gaseous fuel shut off valve is opened in step (b) and while the engine is operating in the liquid fuel mode; and(d) comparing the liquid fuel rate determined in step (c) with the liquid fuel rate determined in step (a).