B - Operations – Transporting – 60 – K
Patent
B - Operations, Transporting
60
K
341/68
B60K 17/06 (2006.01) F16H 61/06 (2006.01) F16H 59/38 (2006.01) F16H 59/68 (2006.01) F16H 61/00 (2006.01)
Patent
CA 2026366
METHOD OF ADAPTIVE CONTROL FOR CLOSED THROTTLE DOWNSHIFT IN AN AUTOMATIC TRANSMISSION ABSTRACT OF THE DISCLOSURE In an automatic transmission, clutch-to-clutch closed throttle downshifting is controlled by filling the on-coming clutch at a maximum pressure command for a set period while commanding the off-going clutch pressure to a low value and exhausting the off-going clutch before the end of the fill period. At the end of the fill period the on-coming pressure is set to an initial value and then ramped up until turbine speed is pulled up due to off-going clutch slippage. Then a closed-loop profile control period starts wherein the slip of the on-coming clutch is measured and controlled to a slip profile. When synchronization of the on-coming clutch is detected, maximum pressure is commanded. Parameters for controlling the quality of a shift such as on-coming clutch initial pressure and on-coming clutch fill time are automatically adjustable during vehicle use to correct shift aberrations which degrade shift quality.
Hibner John A.
Hunter Joseph H.
Runde Jeffrey K.
General Motors Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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