Gm Global Technolgoy Operations, Inc.

Jeffrey Nicholas Trush

Ronald F Lochocki, Jr

Scott D Biggs

Moussa Ndiaye

Patrick Alan Lewis

William Wise

A vehicle propulsion system includes an engine for generating torque for propelling the vehicle, a transmission selectively coupled to the engine for receiving torque from the engine and having a plurality of gear selections each of which have a gear ratio which converts the torque from the engine to an output torque, a vehicle location identifier that identifies a location of the vehicle and provides a vehicle location signal indicating a location of the vehicle, and a controller that is programmed to record a shift history comprising gear selection, duration of gear selection, and vehicle location of each gear selection, identify a gear selection having a duration less than a predetermined duration, and revise a shift parameter for a gear selection having a duration less than the predetermined duration.

Vehicle propulsion system and method for controlling a vehicle propulsion system

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.

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Oxford, MI, United States of America

Jeffrey Nicholas Trush