System and method for randomly adjusting a firing frequency of an engine to reduce vibration when cylinders of the engine are deactivated
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United States of America Patent
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May 16, 2017
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N/A
app pub date -
Mar 13, 2013
filing date -
Jan 7, 2013
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Abstract
A system according to the principles of the present invention includes a firing fraction module, an offset generation module, and a firing fraction module. The firing fraction module determines a firing fraction based on a driver torque request. The offset generation module randomly generates an offset. The firing control module adds the firing fraction to a running total each time that a crankshaft of an engine rotates through a predetermined angle, adds the offset to the running total, and executes a firing event in a cylinder of the engine when the running total is greater than or equal to a predetermined value.
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