Firing fraction management in skip fire engine control
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United States of America Patent
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May 8, 2018
Grant Date -
Mar 9, 2017
app pub date -
Nov 21, 2016
filing date -
Oct 17, 2011
priority date (Note) -
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Abstract
In various described embodiments skip fire control is used to deliver a desired engine output. A controller determines a skip fire firing fraction and (as appropriate) associated engine settings that are suitable for delivering a requested output. In one aspect, the skip fire controller is arranged to select a base firing fraction that has a repeating firing cycle length that will repeat at least a designated number of times per second at the current engine speed. Such an arrangement can be helpful in reducing the occurrence of undesirable vibrations.
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