COMBUSTION SYSTEM FOR GASEOUS FUELLED INTERNAL COMBUSTION ENGINE

摘要

Gaseous fuel injection pressures are normally less than liquid fuel injection pressures, resulting in reduced gaseous fuel jet momentum and mixing. A combustion system for an internal combustion engine comprises an intake port and valve, a cylinder and a piston that cooperate to provide a quiescent combustion chamber. The piston includes a re-entrant type piston bowl comprising an outer periphery and a protuberance emanating from the outer periphery. A fuel injector is configured to directly introduce a gaseous fuel into the combustion chamber and an ignition source is provided for igniting the gaseous fuel. A controller actuates the fuel injector such that a gaseous fuel jet is directed towards and splits upon impacting the protuberance forming first and second fuel plumes. The first fuel plume is redirected towards a first mixing zone adjacent a cylinder head and the second fuel plume redirected towards a second mixing zone adjacent the piston bowl.

主权项

1. A method for combusting a gaseous fuel in a combustion chamber of an internal combustion engine comprising:
introducing an intake charge into said combustion chamber with a swirl number within a range of 0 to 0.5; introducing a gaseous fuel jet directly into said combustion chamber; igniting said gaseous fuel; and when under high load conditions:
splitting said gaseous fuel jet into at least a first fuel plume and a second fuel plume;redirecting said first fuel plume towards a first mixing zone adjacent a cylinder head; andredirecting said second fuel plume towards a second mixing zone adjacent a piston bowl; or when under light load conditions:
guiding said gaseous fuel jet towards said second mixing zone.