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:
Mar. 17, 2015
Filed:
Mar. 12, 2013
GM Global Technology Operations Llc, Detroit, MI (US);
Vijay A. Neelakantan, Rochester Hills, MI (US);
Nathaniel E. Wilke, Waterford, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method of executing a double transition shift in a transmission includes determining via a controller that one of four clutches involved in the shift has a clutch slip direction relative to input member rotation direction in one of the current gear and the commanded gear and an opposite clutch torque direction relative to input member torque direction in the other of the current gear and the commanded gear. The controller then calculates clutch torques for at least some of the offgoing clutches and at least some of the oncoming clutches, and controls torque at the offgoing clutches and the oncoming clutches during the shift according to the calculated clutch torques to ensure that the clutch with the opposite slip and torque directions does not provide reaction torque during the shift unless clutch slip across said one of the four clutches is zero or in the clutch torque direction.