F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
341/68, 341/72
F16H 61/04 (2006.01) F16H 61/06 (2006.01) F16H 59/46 (2006.01) F16H 61/00 (2006.01)
Patent
CA 2026807
CLUTCH-TO-CLUTCH CONTROL IN 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 speed which is controlled to a calculated slip speed profile. The profile has a first steep slope and a final less steep slope so that the actual slip can smoothly go to zero in a given time period.
Hibner John A.
Lentz Carl A.
General Motors Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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