Determination of a value for a valve lift of a valve of an individual cylinder of an internal combustion engine with a plurality of cylinders
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United States of America Patent
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Apr 18, 2017
Grant Date -
Jun 4, 2015
app pub date -
Dec 5, 2012
filing date -
Dec 13, 2011
priority date (Note) -
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Abstract
A method and device for determining a value for a valve lift of a valve of an individual cylinder of a multi-cylinder internal combustion engine are provided. The method includes determining a first exhaust-gas lambda value for fuel combustion in the individual cylinder in a first operating state of the engine by a cylinder-individual and time-resolved detection of lambda values without an artificial variation in an air/fuel ratio. The method also includes determining an air mass sucked in by all cylinders of the engine in the first operating state. The method also includes determining the value for the valve lift of the valve of the individual cylinder based on the first exhaust-gas lambda value, the determined air mass, and a correction value, wherein the correction value is based on a relationship between the valve lift and an associated air mass sucked in by all cylinders of the engine.
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