Patent ID: 6505601
Filing Date: 2003-01-14
Classification: F02B,F02D,Y02T

Abstract:
A method for operating a reciprocating-piston internal combustion engine having a crank angle and an injector nozzle for directly injecting fuel into a working space of a cylinder, the working space including a recess of a piston, the engine capable of operating in a lower part-load range, a middle part-load range, an upper part-load range, and a full-load range, the method comprising:during the lower part-load range, injecting a first amount of the fuel centrally into the working space at a first injection pressure at a time shortly before the crank angle reaches a top dead center position so as to produce a heterogeneous mixture; during the middle part-load range, injecting a second amount of the fuel into the working space at a second injection pressure at a time when the crank angle is between 180Â° and 20Â° before the top dead center position so as to produce a homogeneous mixture; and during at least one of the upper part-load range and the full-load range, injecting a portion of a third amount of the fuel into the working space at a third injection pressure 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 working space at a fourth injection pressure at a time when the piston is approximately at the top dead center position so as to produce a heterogeneous mixture.