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METHOD FOR REDUCING CYLINDER AIR-FUEL RATIO IMBALANCE

  • US 20170241369A1
  • Filed: 02/24/2016
  • Published: 08/24/2017
  • Est. Priority Date: 02/24/2016
  • Status: Active Grant
First Claim
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1. A method comprising:

  • sampling an engine speed signal synchronous with engine firing;

    filtering the sampled engine speed signal via a Notch filter; and

    indicating a cylinder air/fuel imbalance based on an output of the Notch filter relative to a threshold.

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