The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 2004
Filed:
Oct. 22, 2002
Joerg Remele, Hagnau, DE;
Andreas Schneider, Friedrichshafen, DE;
Albrecht Debelak, Friedrichshafen, DE;
MTU Friedrichshafen GmbH, Friedrichshafen, DE;
Abstract
Contributions of individual cylinders of the internal-combustion engine to the rotational acceleration are determined by the rotational speed course of the crankshaft by individually cutting off the cylinders successively. From the thus obtained rotational speed course curves, a pulse response spectrum {right arrow over (I)} of an operating cycle is formed at least for the harmonic of the 0.5th order. In normal operation, the rotational speed course of the crankshaft is then continuously recorded above the angle of each operating cycle. By a Fourier transformation, Fourier coefficients are determined as a resultant {right arrow over (R)} at least of the harmonic of the 0.5th order. Correction factors for the injection quantities are obtained for equalization of the individual cylinders with respect to their rotational speed fractions. The components of the resultant {right arrow over (R)} situated in the direction of the pulse response vectors are multiplied with the pulse responses {right arrow over (I)} and are combined by addition.