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:
Sep. 22, 2009
Filed:
Jan. 23, 2007
Jian Lin, Beverly Hills, MI (US);
Yong Xu, Ann Arbor, MI (US);
Wenbo Wang, Novi, MI (US);
Michael R. Grimes, Saline, MI (US);
Jian Lin, Beverly Hills, MI (US);
Yong Xu, Ann Arbor, MI (US);
Wenbo Wang, Novi, MI (US);
Michael R. Grimes, Saline, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A rough road detection system includes an engine speed module, a feature space module, a normalization module, and a rough road module. The engine speed module generates an engine speed signal based on a crank signal. The feature space module generates a feature space signal based on the engine speed signal. The normalization module generates a normalized signal. The normalized signal is based on the feature space signal and a normalization value that varies in accordance with the engine speed signal. The rough road module determines whether a rough road condition exists based on the normalized signal.