F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
341/68
F16H 61/04 (2006.01) F16H 61/06 (2006.01) F16H 59/46 (2006.01) F16H 61/00 (2006.01)
Patent
CA 2026814
METHOD OF CLUTCH-TO-CLUTCH 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. If the throttle is opened during the downshift, the algorithm reverts to a powered downshift algorithm if the off-going clutch still has pressure or to an open-loop ramp control of the on-coming clutch if the off-going clutch has been exhausted.
Hibner John A.
Lentz Carl A.
General Motors Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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