Patent ID: 6513487
Filing Date: 2003-02-04
Classification: F02B,F02D,F02M,Y02T

Abstract:
A method for operating a reciprocating-piston internal combustion engine having an injector nozzle for directly injecting fuel into a combustion chamber and having a piston including a piston crown and a piston recess, the engine operating in a light part-load range, a part-load range, and a full load range, the method comprising:during the light part-load range, injecting a first amount of the fuel centrally into the piston recess at a substantially flat first angle relative to a top surface of the piston crown at a time shortly before the piston reaches a top dead center position so as to produce a heterogeneous mixture; during the part-load range, injecting a second amount of the fuel into the piston recess at least partly at a second angle steeper than the first angle relative to top surface of the piston crown at a time when the crank angle is within a range between 180Â° and 20Â° before the top dead center position so as to produce a homogeneous mixture; and during the full load range, injecting a portion of a third amount of the fuel into the piston recess at a steep and flat angle relative to the top surface of the piston crown at a time when the crank angle is within a range between 180Â° and 20Â° before the top dead center position so as to produce a homogeneous mixture and a remainder of the third amount of the fuel into the piston recess at a substantially flat angle relative to the surface of the piston crown at a time when the piston is approximately at the top dead center position so as to produce a heterogeneous mixture.