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:
Feb. 14, 2012
Filed:
Aug. 05, 2008
Michael D. Foster, Carmel, IN (US);
Michael D. Foster, Carmel, IN (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A detection scheme for diagnosing failure of clutch control components in a hydraulic control module of a power transmission utilizes pressure switch sensors to detect the position of each of the valves associated with the clutch control mechanization. The mechanization of these sensors with the valves provides the ability to clearly define the position of each of the valves, while also enabling the transmission electro-hydraulic control module (TEHCM) to diagnose the state of health of each pressure switch. The detection scheme may then differentiate between a failed switch and a failed (e.g., 'stuck' or 'out of position') valve, while preventing unexpected and undesired shift sequencing within the transmission.