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Control device for internal combustion engine

  • US 10,450,982 B2
  • Filed: 04/16/2018
  • Issued: 10/22/2019
  • Est. Priority Date: 04/28/2017
  • Status: Active Grant
First Claim
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1. A control device for an internal combustion engine, the control device comprising:

  • an electronic control unit configured to;

    determine whether a cylinder-specific air-fuel ratio processing is being executed, the cylinder-specific air-fuel ratio processing controlling (i) an air-fuel ratio of at least one of a plurality of cylinders of the internal combustion engine to be a rich air-fuel ratio, which is lower than a stoichiometric air-fuel ratio, and (ii) an air-fuel ratio of at least one of the other cylinders of the plurality of cylinders to be a lean air-fuel ratio, which is higher than the stoichiometric air-fuel ratio;

    in response to determining that the cylinder-specific air-fuel ratio processing is not being executed, calculate and update a first learning value, which is a difference between a knock strength of the internal combustion engine and a first determination value;

    in response to determining that the cylinder-specific air-fuel ratio processing is being executed, prohibit updating of the first learning value;

    calculate a target ignition timing of the internal combustion engine based on the first learning value; and

    control ignition timing of the internal combustion engine based on the calculated target ignition timing.

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