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US 7,299,687 B2Granted
Rough road detection system
AssigneeGM Global Technology Operations LLC
InventorClaudio A. Hernandez
Life of this patent
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Abstract
A rough road detection system for a vehicle according to the present invention includes a frequency domain module, an engine misfire module, and a rough road module. The frequency domain module converts a vector signal into a frequency domain signal. The engine misfire module determines whether an engine misfires based on the frequency domain signal. The rough road detection module determines whether the vehicle is driving on a rough road based on the frequency domain signal.
Claims18
A rough road detection system for a vehicle, comprising:
- a frequency domain module that converts a vector signal into a frequency domain signal;
- an engine misfire module that determines whether an engine misfires based on at least one of a power and an energy of said frequency domain signal;
- a rough road module that determines whether the vehicle is driving on a rough road based on at least one of said power and said energy of said frequency domain signal.
A method to detect a rough road condition for a vehicle, comprising:
- converting a vector signal of engine speed samples into a frequency domain signal;
- determining at least one of a power and an energy of said frequency domain signal;
- determining whether an engine misfires based on at least one of said power and said energy of said frequency domain signal;
- determining whether the vehicle is driving on a rough road based on at least one of said power and said energy of said frequency domain signal;
- and
- generating a rough road condition signal based upon at least one of said determining whether said engine misfires and said determining whether said vehicle is driving on said rough road.
3 more elements
Dependencies are inferred from the claim text.