Patent ID: 7463967
Filing Date: 2008-12-09
Classification: F02D,F02M,Y02T

Abstract:
1. An operating method for an internal combustion engine, said operating method comprising: delivering a gaseous fuel to a fuel injection valve, wherein gaseous fuel pressure within said fuel injection valve is defined as gaseous fuel injection pressure; during an engine's compression stroke, injecting said gaseous fuel directly into a combustion chamber through said fuel injection valve; determining a value for at least one pre-selected engine parameter from engine operating conditions and commanding gaseous fuel injection pressure to a predetermined target value that is associated with said determined value of said at least one pre-selected engine parameter; and measuring gaseous fuel injection pressure and adjusting fuel injection pulsewidth to correct for differences between said predetermined target values and measured gaseous fuel injection pressure to thereby inject a desired mass quantity of gaseous fuel as determined from an engine map.