Patent ID: 6457455
Filing Date: 2002-10-01
Classification: F02D

Abstract:
A method for detecting combustion misfires and cylinder equalization in a multi-cylinder internal combustion engine having knock control, the method comprising the following steps for each crankshaft revolution:individually determining rough running values for each cylinder of said engine by measuring segment times which include times corresponding to the piston movement of each cylinder to be measured in which the crankshaft passes through a corresponding circular segment angular region; comparing the determined rough-running values to a threshold value in a desired value comparison; computing correction factors for each cylinder for the change of injection times or ignition time points or charge of the individual cylinders in an evaluation unit on the basis of the deviation between the determined rough-running values and desired value; permitting the computed correction factors (GL1) to serve as the basis for the determination of a rough-running increase value (dLUT) effected by said change; computing a corrected rough-running value (LUTcorrected) with the determined rough-running increase value (dLUT); and, utilizing the corrected rough-running value (LUTcorrected) for the computation of final correction factors (GL2) for operating on the injection times or ignition time points.