Brooks Kushman P.C.
Clutch torque trajectory correction to provide torque hole filling during a ratio upshift
A multiple ratio transmission having an input shaft, an output shaft and oncoming clutch and off-going clutch for effecting ratio upshifts is provided. The transmission also includes a transmission controller configured for controlling shifts. During the torque phase of a ratio upshift, the controller increases input torque. Next, the controller estimates an oncoming clutch target torque. The controller controls a torque input to ensure the off-going clutch remains locked. The controller measures an actual transmission value for a torque transmitting element of the transmission and corrects the oncoming clutch target torque using the actual transmission value whereby an increasing torque for the oncoming friction element is achieved with minimal torque transients along the output shaft during the upshift.
Ford Global Technologies, LLC
F B F F F F B F F F
F16H B60W F16H F16H F16H F16H B60W F16H F16H F16H
inventional inventional additional additional inventional additional inventional inventional inventional inventional
Yuji Michael Glenn Gregory Michael Diana Christopher John Hongtei Eric Seung-Hoon
Fujii Fodor Pietron Yanakiev Teslak Tseng Lee