B - Operations – Transporting – 60 – K
Patent
B - Operations, Transporting
60
K
341/68
B60K 17/06 (2006.01) F16H 61/06 (2006.01) F16H 59/46 (2006.01) F16H 61/00 (2006.01)
Patent
CA 2024601
ADAPTIVE CONTROL OF AN AUTOMATIC TRANSMISSION ABSTRACT OF THE DISCLOSURE In an automatic transmission upshifting is controlled by ramping down the pressure in an off-going clutch associated with a high speed ratio and increasing the pressure in an on-coming clutch associated with a lower speed ratio. The on-coming clutch has commanded pressure at a maximum value for an initial fill time, a lower increasing ramp value during the ramp of the off-going clutch until the on-coming clutch starts to engage, and then a closed-loop control until the clutch reaches a synchronous speed. The closed-loop control parameter is on-coming clutch slip which is controlled to a calculated slip speed profile. Parameters for controlling the quality of a shift such as on-coming clutch initial pressure, off-going clutch initial pressure and on-coming clutch fill time are automatically adjustable during vehicle use to correct shift aberrations which degrade shift quality. A fast adjustment mode is in effect initially to calibrate the transmission control for the engine and vehicle. After a smooth shift is obtained only small adjustments are allowed.
Hunter Joseph H.
Lentz Carl A.
Runde Jeffrey K.
Wiles Christopher R.
General Motors Corporation
Gowling Lafleur Henderson Llp
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