System and method for knock detection based on ethanol concentration in fuel
AssigneeGM Global Technology Operations LLC
InventorsWajdi B. Hamama, Craig M. Sawdon, Eric B. Ferch, Matthew David Defever, Hillary L. Broadus
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Abstract
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.
Claims20
A knock detection system for an engine, comprising:
- an intensity module that determines an engine vibration intensity during a first period of engine operation;
- a knock threshold module that determines a knock threshold based on an ethanol concentration in a fuel supplied to said engine;
- and
- a detection module that determines whether engine knock has occurred during said first period by comparing said knock threshold and said engine vibration intensity.
A method for an engine, comprising:
- determining an engine vibration intensity during a first period of engine operation;
- determining a knock threshold based on an ethanol concentration in a fuel supplied to said engine;
- and
- determining whether engine knock has occurred during said first period by comparing said knock threshold and said engine vibration intensity.
Dependencies are inferred from the claim text.