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METHOD AND SYSTEM FOR VARIABLE DISPLACEMENT ENGINE DIAGNOSTICS

  • US 20190331048A1
  • Filed: 04/26/2018
  • Published: 10/31/2019
  • Est. Priority Date: 04/26/2018
  • Status: Active Grant
First Claim
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1. A method for an engine, comprising:

  • actuating, via a solenoid, an electric latch pin of a cylinder valve deactivation mechanism coupled to a valve of a cylinder at a first time while engine speed is less than a threshold; and

    indicating degradation of the cylinder valve deactivation mechanism based on inferred latch pin movement during the actuating.

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