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Gm Global Technolgoy Operations, Inc.

Patrick Alan Lewis

Ronald F Lochocki, Jr

Brian M Porto

Scott D Biggs

Moussa Ndiaye

Jason C Jousma

Jeffrey Nicholas Trush

Jason M France

A transmission includes a torque converter with an impeller, a turbine, a torque converter clutch, a hydraulic torque converter clutch control circuit and a controller that commands a first pressure into the hydraulic torque converter clutch control circuit during a transition period between a torque converter clutch OFF mode to a torque converter clutch ON mode and prior to the torque converter clutch reaching capacity and a second pressure into the hydraulic torque converter clutch control circuit after the torque converter clutch reaches capacity.

System and method for torque converter clutch pressure circuit filling and capacity detection

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.

Vehicle transmission with tie-up monitoring logic

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Howell, MI, United States of America

Patrick Alan Lewis