Gm Global Technolgoy Operations, Inc.

Hillary L Broadus

Wajdi B Hamama

Craig Michael Sawdon

Eric B Ferch

Matthew David Defever

A knock detection system for an engine includes an intensity module, a knock threshold module, and a detection module. The intensity module determines an engine vibration intensity during a first period of engine operation. The knock threshold module determines a knock threshold based on an ethanol concentration in a fuel supplied to the engine. The detection module determines whether engine knock has occurred during the first period by comparing the knock threshold and the engine vibration intensity.

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Commerce Township, MI, United States of America

Hillary L Broadus