Ford Global Technolgoies, LLC

Mohamed Redissi

Gregory Michael Pietron

Yuji Fujii

Seung-Hoon Lee

James William Loch McCallum

David Popejoy

Jau-Wen Tseng

Ted Duane Snyder

Diana Yanakiev

Robert Orley Burkhart

John Butwin

A load sensor assembly for measuring an amount of torque transmitted through a torque establishing element includes a core mounted on a transmission housing and a load sensor mounted on the core. The load sensor is positioned against a portion of the torque establishing element whereby a portion of the amount of torque transmitted through the torque establishing element travels through the load sensor and is measured. A cable is connected to the load sensor for transmitting a signal representative of the amount of torque to a transmission controller.

Friction element load sensing in an automatic transmission

A closed loop shift control apparatus and method based on friction element load controls a torque transfer phase when shifting from a low gear configuration to a high gear configuration for an automatic transmission system. When pressure actuated friction elements are selectively engaged and released to establish torque flow paths in the transmission, measurements or estimates of torsional load exerted on the off-going friction element are used to predict the optimal off-going friction element release timing for achieving a consistent shift feel. The ideal timing to release the off-going friction element is uniquely defined when torque load exerted onto the off-going friction element becomes substantially zero. An on-coming clutch engagement process is controlled by a closed loop control based on measurements or estimates of on-coming clutch torque capacity for a constant shift feel under dynamically changing conditions.

Closed-loop torque phase control for shifting automatic transmission gear ratios based on friction element load sensing

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Ann Arbor, MI, United States of America

Mohamed Redissi