Patrick S Lewis

US Patent:

20150233432, Aug 20, 2015

Filed:

Feb 20, 2014

Appl. No.:

14/185222

Inventors:

- Detroit MI, US
Moussa Ndiaye - Canton MI, US
Patrick Alan Lewis - Howell MI, US
Jeffrey Nicholas Trush - Oxford MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

F16D 48/06

Abstract:

A vehicle includes a prime mover, transmission, and controller. The transmission, e.g., a DCT or 8-speed automatic transmission, includes an input member, an output member, gear sets, and a plurality of clutches. The controller monitors the transmission for a threshold tie-up condition via a method, which includes processing clutch control input signals and a gearbox status signal to identify the clutches involved in a present operating mode of the transmission, e.g., a shift, neutral, or fixed gear. The controller determines the torque capacity of each involved clutch, compares the determined clutch torque capacities to respective calibrated clutch torque capacities, and executes a control action in response to a threshold tie-up condition. The threshold tie-up condition is present when the determined clutch torque capacities exceed the calibrated clutch torque capacity for at least one of the involved clutches for longer than a calibrated duration.