EVALUATING GASEOUS FUEL ADMISSION VALVE OPERABILITY

摘要

A method of evaluating operability of a gaseous fuel admission valve of an internal combustion engine is disclosed. The internal combustion engine includes a plurality of cylinders and at least one gaseous fuel admission valve for each cylinder of the plurality of cylinders. The method includes operating the dual fuel internal combustion engine on liquid fuel. The method further includes supplying gaseous fuel to the gaseous fuel admission valves at a pressure above an intake manifold air pressure thereby setting a differential gas pressure across the gaseous fuel admission valves. The method also includes operating the gaseous fuel admission valves to add gaseous fuel to intake air while operating the dual fuel internal combustion engine primarily on liquid fuel. Further, the method includes measuring combustion process parameters for the cylinders. The method also includes evaluating operability of the gaseous fuel admission valves based on the measured combustion process parameters.

主权项

1. A method of evaluating operability of gaseous fuel admission valves of a dual fuel internal combustion engine comprising a plurality of cylinders and at least one gaseous fuel admission valve for each cylinder of the plurality of cylinders, the method comprising:
operating the dual fuel internal combustion engine on liquid fuel; supplying gaseous fuel to the gaseous fuel admission valves at a pressure above an intake manifold air pressure thereby setting a differential gas pressure across the gaseous fuel admission valves; operating the gaseous fuel admission valves to add gaseous fuel to intake air while operating the dual fuel internal combustion engine primarily on liquid fuel; measuring, for the plurality of cylinders, combustion process parameters; and evaluating operability of the gaseous fuel admission valves based on the measured combustion process parameters.