Patent ID: 6675748
Filing Date: 2004-01-13
Classification: F02B,F02D,F02M,Y02T

Abstract:
A method of introducing fuel into a combustion chamber of an internal combustion engine having at least one cylinder with a piston, said at least one cylinder and said piston partially defining said combustion chamber, said piston oscillating within said cylinder between top dead center and bottom dead center when said internal combustion engine is operating, said method comprising:(a) selecting either of a low load operating mode and a high load operating mode, said operating modes distinguished by combustion characteristics of a fumigated gaseous fuel within said combustion chamber, wherein: (1) said low load operating mode is defined where said fumigated gaseous fuel is unable to support stable premixed combustion, (2) said high load operating mode is defined where said fumigated gaseous fuel is able to support stable premixed combustion, (b) in said high load operating mode, introducing said fumigated gaseous fuel into said combustion chamber before said piston is at top dead center, (c) in said low load operating mode, if said fumigated gaseous fuel is provided, introducing said fumigated gaseous fuel into said combustion chamber before said piston is at top dead center, (d) in said low load operating mode, directly injecting a quantity of a second gaseous fuel into said combustion chamber when said piston is at or near top dead center, (e) igniting said fumigated gaseous fuel and said second gaseous fuel within said combustion chamber when said piston is at or near top dead center.