Gm Global Technolgoy Operations, Inc.

Frank Garthoff

Wajdi B Hamama

Kevin M Luchansky

Craig Michael Sawdon

James R Reeder, Jr

Christian Mueller

Jessica A Carroll

A method includes: generating an indicator of present operating conditions of an engine; determining a first amount of noise based on vibration measured during a first plurality of combustion events of a cylinder; storing the first amount of noise and a first value of the indicator in a mapping based on a first engine speed and a first engine load; determining the first value of the indicator from the mapping based on a second engine speed and a second engine load; generating a trigger signal when the first value is different than a second value of the indicator; and, when the trigger signal is generated: determining a second amount of noise based on vibration measured during a second plurality of combustion events of the cylinder; and replacing the first amount of noise and the first value in the mapping with the second amount of noise and the second value.

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Bad Duerkheim, Germany

Frank Garthoff