B - Operations – Transporting – 60 – K
Patent
B - Operations, Transporting
60
K
341/68
B60K 17/02 (2006.01) F16H 61/06 (2006.01) F16H 59/46 (2006.01) F16H 61/00 (2006.01)
Patent
CA 2023986
CONTROL METHOD OF CLUTCH-TO-CLUTCH POWERED DOWNSHIFT IN AN AUTOMATIC TRANSMISSION Abstract of the Disclosure In an automatic transmission, clutch-to-clutch powered downshifting is controlled by filling the on-coming clutch at a low pressure while ramping down the off-going clutch pressure until turbine speed is pulled up due to off-going clutch slippage, and then increasing the off-going pressure stepwise to compensate the change from static to dynamic coefficients of friction. Then the on-coming pressure is gradually ramped up and a closed-loop profile control period starts wherein the slip of the on-coming clutch is measured and controlled to a slip profile by controlling the off-going clutch pressure. When synchronization of the on-coming clutch is first detected, a closed-loop sync control period starts wherein the off-going pressure is controlled to minimize the slip and the on-coming pressure is ramped up at a steeper rate to begin clutch engagement during the sync control period.
Hunter Joseph H.
Lentz Carl A.
General Motors Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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