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Firing pattern management for improved transient vibration in variable cylinder deactivation mode

  • US 9,556,811 B2
  • Filed: 06/20/2014
  • Issued: 01/31/2017
  • Est. Priority Date: 06/20/2014
  • Status: Active Grant
First Claim
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1. A cylinder control system of a vehicle, comprising:

  • a cylinder control module that;

    determines target numbers of cylinders of an engine to be activated during a period;

    determines, based on the target numbers and an engine speed, N predetermined subsequences for controlling the cylinders of the engine during the period, where N is an integer greater than zero;

    determines a transition parameter associated with at least one transition between two of the N predetermined subsequences, the two predetermined subsequences each including M indicators for the M cylinder events, each of the M indicators indicating whether to activate or deactivate a corresponding cylinder, where M is an integer greater than one,wherein the transition parameter includes a first number (X) for truncating one of the two predetermined subsequences and a second number (Y) for truncating the other one of the two predetermined subsequences, where X and Y are integers greater than zero and less than M;

    adjusts the one of the two predetermined subsequences, by removing the last X number of the M indicators of the one of the two predetermined subsequences, to produce a first adjusted predetermined subsequence; and

    adjusts the other one of the two predetermined subsequences, by removing the first Y number of the M indicators of the other one of the two predetermined subsequences, to produce a second adjusted predetermined subsequence; and

    a cylinder actuator module that, during the period, controls the cylinders of the engine based on the N predetermined subsequences, the first adjusted predetermined subsequence, and the second adjusted predetermined subsequence.

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