Patent ID: 6820593
Filing Date: 2004-11-23
Classification: F02D

Abstract:
A method of controlling smooth running of a crankshaft of an internal-combustion engine, in which contributions of individual cylinders of the internal-combustion engine to rotational acceleration are determined by a rotational speed course of the crankshaft and in which injection quantities of injectors assigned to the cylinders are varied for adjusting defined rotational speed contributions to the rotational speed course, comprising:forming a pulse response spectrum {right arrow over (I)} of an operating cycle at least for the harmonic of the 0.5th order based on computed or measured rotational speed curves of the crankshaft, recording, in normal operation, in each case, the rotational speed course of the crankshaft above an angle of an operating cycle recorded and determining, by a Fourier transformation, the Fourier coefficients as a resultant {right arrow over (R)} at least of the harmonic of the 0.5th order, and obtaining correction factors for the injection quantities of the individual cylinders, the components of the resultant {right arrow over (R)} situated in the direction of the pulse response vectors being multiplied with the pulse response spectrum {right arrow over (I)} and combined by an addition.