Patent ID: 6640773
Filing Date: 2003-11-04
Classification: F02B,F02D,F02M,Y02T

Abstract:
A method of introducing gaseous fuel into a cylinder of an operating internal combustion engine, said engine having a piston disposed within said cylinder, said method comprising:(a) monitoring a set of engine parameters; (b) determining engine load and engine speed from said set of engine parameters; (c) in a first stage, introducing a first gaseous fuel into said cylinder where said first gaseous fuel forms a substantially homogeneous mixture comprising said first gaseous fuel and intake air prior to combustion; and (d) in a second stage, occurring sequentially after said first stage, introducing a second gaseous fuel into said cylinder; wherein said first and second gaseous fuel quantity is controllable in response to at least one of engine load and engine speed, and at least one of initiation and duration of at least one of said first and second stages is variable in response to at least one of engine load and engine speed.