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Control systems and methods for air fuel imbalance and cylinder deactivation

  • US 9,874,167 B2
  • Filed: 06/08/2016
  • Issued: 01/23/2018
  • Est. Priority Date: 06/08/2016
  • Status: Active Grant
First Claim
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1. An engine control system comprising:

  • a torque request module that determines a torque request for an engine based on a driver input;

    a cylinder control module that, based on the torque request, determines a target fraction of a number of cylinders of the engine to be activated out of a total number of cylinders of the engine;

    an air fuel imbalance (AFIM) module that selectively commands that the cylinder control module set the target fraction to a predetermined fraction of the total number of cylinders of the engine to be activated,wherein the cylinder control module further;

    sets the target fraction to the predetermined fraction in response to the command; and

    activates and deactivates opening of intake and exhaust valves of the cylinders of the engine based on the target fraction; and

    wherein the AFIM module further, while the target firing fraction is set to the predetermined fraction, selectively diagnoses the presence of an AFIM fault based on samples of a signal from an oxygen sensor measuring oxygen in exhaust upstream of a catalyst of an exhaust system.

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