Discrete variable valve lift diagnostic systems and methods

Details Discrete variable valve lift diagnostic systems and methods Discrete variable valve lift diagnostic systems and methods

2008-06-17

2008-06-17

McCall, Eric S (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

Reexamination Certificate

active

07387018

ABSTRACT:
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.

REFERENCES:
patent: 7047924 (2006-05-01), Waters et al.
patent: 7146851 (2006-12-01), Wakahara et al.
patent: 2004/0129249 (2004-07-01), Kondo
patent: 2005/0204805 (2005-09-01), Wakahara et al.
patent: 2007/0265805 (2007-11-01), Lee et al.

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