The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 17, 2008
Filed:
Nov. 17, 2006
Applicant:
Matthew A. Wiles, Royal Oak, MI (US);
Inventor:
Matthew A. Wiles, Royal Oak, MI (US);
Assignee:
GM Global Technology Operations, Inc., Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M 15/00 (2006.01);
U.S. Cl.
CPC ...
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.