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SYSTEM AND METHOD FOR RANDOMLY ADJUSTING A FIRING FREQUENCY OF AN ENGINE TO REDUCE VIBRATION WHEN CYLINDERS OF THE ENGINE ARE DEACTIVATED

  • US 20140190449A1
  • Filed: 03/13/2013
  • Published: 07/10/2014
  • Est. Priority Date: 01/07/2013
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a firing fraction module that determines a firing fraction based on a driver torque request;

    an offset generation module that randomly generates an offset; and

    a firing control module that;

    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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