USING VALVE TIMING TO IMPROVE ENGINE ACOUSTICS
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United States of America Patent
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Issued Date -
Nov 7, 2013
app pub date -
May 2, 2013
filing date -
May 2, 2012
priority date (Note) -
Abandoned
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Abstract
A method for improving the operation of an internal combustion engine implementing cylinder deactivation is described. Generally, the pattern of combustion events that are fired and skipped together with the geometry of the exhaust and/or intake system can create unpleasant acoustic issues. By slightly altering the timing of the cylinder intake and exhaust valves, these acoustic issues can be mitigated. The valve timing can be altered on a combustion event by combustion event basis. Alternatively, valve timing for different groups of cylinders can be modified together.
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