Cylinder equalisation method for internal combustion (IC) engine direct fuel injection

The method involves determining the rotational speed of the crankshaft of a combustion engine in the quasi-stationary operation state of the combustion engine. The rotational speed value is corrected using a mean value filter having a zero group delay. The change of the kinetic energy of the cranksh...

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Bibliographic Details
Main Authors SCHERNEWSKI, RALF, STRAKY, HARALD, PRZYMUSINSKI, ACHIM
Format Patent
LanguageEnglish
German
Published 30.09.1999
Edition6
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
WEAPONS
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Summary:The method involves determining the rotational speed of the crankshaft of a combustion engine in the quasi-stationary operation state of the combustion engine. The rotational speed value is corrected using a mean value filter having a zero group delay. The change of the kinetic energy of the crankshaft in the expansion interval of the cylinder is calculated using the corrected rotational speed values. A relative measure is derived for each cylinder and includes information about too much or too little injected fuel. A correction term is calculated for the injection time using the measure. Aus dem Drehzahlsignal der Kurbelwelle wird im quasi-stationären Betrieb der Brennkraftmaschine die Änderung der kinetischen Energie der Kurbelwelle im Expansionsintervall eines Zylinders berechnet und auf die maximale zuführbare Kraftstoffmenge in diesem Intervall bezogen. Das daraus erhaltene, einheitslose Residuum stellt für den betrachteten Zylinder ein Maß für zuviel oder zuwenig des eingespritzen Kraftstoffes dar. Aus den berechneten Residuen werden Korrekturterme für die Einspritzzeiten der einzelnen Zylinder abgeleitet.
Bibliography:Application Number: DE1998112305