METHOD AND APPARATUS FOR FUEL INJECTION INTO AN INTERNAL COMBUSTION ENGINE

摘要

A method and apparatus for injecting a gaseous fuel into a combustion chamber of an internal combustion engine employs a combination of operating modes. First, one of a low load and a high load mode of operation is selected during the operation of the internal combustion engine. Low load and high load modes are distinguished by the combustion characteristics of an amount of fumigated fuel added to the combustion chamber. Fumigated fuel that supports combustion will cause high load to be selected. Fumigated fuel that does not support combustion will cause low load to be selected. A directly injected amount of fuel is provided under low load. Under high load, a directly injected quantity of fuel can be added when the piston is near top dead center to allow the engine to meet load requirement above that provided by the fumigated fuel.