Diederiks & Whitelaw PLC
Closed-loop torque phase control for shifting automatic transmission gear ratios based on friction element load sensing
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.
Ford Global Technologies, LLC
F F F F
F16H F16H F16H F16H
additional inventional additional additional
Gregory Michael Robert Orley James William Loch Seung-Hoon Yuji John David Mohamed Diana
Pietron Burkhart McCallum Lee Fujii Butwin Popejoy Redissi Yanakiev