Patent ID: 6467453
Filing Date: 2002-10-22
Classification: F02D,F02M,Y02T

Abstract:
A method for forming an air/fuel mixture in a combustion space of an internal combustion engine, in which fuel is injected into the combustion space with a varying fuel mass flow during an operational cycle of the internal combustion engine, at least under determinable engine operating conditions, three-stage fuel injection occurring during a compression phase, said method comprising:in a first injection step, injecting a main fuel quantity which depends on a load condition of the internal combustion engine, for the formation of a first mixture cloud; in a second injection step, which follows directly the first injection step, injecting an additional fuel quantity, with a fuel mass flow which is smaller than a fuel mass flow provided in the first injection step; and in a third injection step, which follows directly the second injection step, injecting an ignition fuel quantity, with a fuel mass flow which is larger than the fuel mass flow provided in the second injection step, for the formation of a second mixture cloud; wherein injection of the additional fuel quantity connects the second mixture cloud to the first mixture cloud.