Discrete variable valve lift diagnostic systems and methods

A diagnostic system for a discrete variable valve lift system of an internal combustion engine is provided. The system includes: a Fast Fourier Transform (FFT) module that generates a frequency content signal based on a FFT method and a valve impact sensor signal; and a malfunction module that selec...

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Bibliographic Details
Main Author WILES MATTHEW A
Format Patent
LanguageEnglish
Published 17.06.2008
Subjects
MEASURING
PHYSICS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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Summary:A diagnostic system for a discrete variable valve lift system of an internal combustion engine is provided. The system includes: a Fast Fourier Transform (FFT) module that generates a frequency content signal based on a FFT method and a valve impact sensor signal; and a malfunction module that selectively diagnoses a malfunction of a discrete variable valve lift system based on the frequency content signal.
Bibliography:Application Number: US20060561041