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:
Oct. 16, 2012
Filed:
Jan. 27, 2011
Syed Naqi, Dearborn, MI (US);
Ali K. Naqvi, White Lake, MI (US);
Lawrence A. Kaminsky, White Lake, MI (US);
Jy-jen F. Sah, West Bloomfield, MI (US);
James R. Bartshe, Plymouth, MI (US);
Peter E. Wu, Lake Forest, CA (US);
Syed Naqi, Dearborn, MI (US);
Ali K. Naqvi, White Lake, MI (US);
Lawrence A. Kaminsky, White Lake, MI (US);
Jy-Jen F. Sah, West Bloomfield, MI (US);
James R. Bartshe, Plymouth, MI (US);
Peter E. Wu, Lake Forest, CA (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A system includes a friction element having a driving mechanism and a driven mechanism. At least one of the driving mechanism and the driven mechanism is configured to rotate. A drive unit is configured to provide a torque to at least one of the driving mechanism and the driven mechanism. A control processor is configured to diagnose a friction element failure based on a slip speed, which is the difference between rotational speeds of the driving mechanism and the driven mechanism. The control processor is further configured to induce a slip condition as part of a shift process and diagnose the friction element failure if the derived slip speed is substantially zero after inducing the slip condition.