Method of controlling a transmission during an upshift
AssigneeFord Global Technologies, LLC
InventorsHiral Jayantilal Haria, Yuji Fujii, Gregory Michael Pietron, Rohit Hippalgaonkar, Todd Mccullough
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Abstract
During a transmission upshift, a torque capacity of an off-going clutch is maintained at a non-zero state during the transition from the torque phase to the inertia phase and throughout a substantial portion of the inertia phase. This permits the inertia phase to be completed faster without an unacceptable increase in output torque during the torque phase. Monotonically reducing the off-going clutch torque and using feedback from an output torque sensor enable sufficiently precise control of the off-going clutch torque capacity during this interval.
Claims14
A method of shifting a transmission comprising:
- during a torque phase of an upshift, increasing a torque capacity of an oncoming shift element to initiate slip across an off-going shift element while controlling a torque capacity of the off-going shift element to a non-zero level;
- and
- maintaining positive torque capacity of the off-going shift element through at least a first half of an inertia phase of the upshift to limit an output torque, wherein the torque capacity of the off-going shift element is adjusted based on a measurement of the output torque during a previous upshift.
A method of shifting a transmission comprising:
- during a torque phase of an upshift, increasing a torque capacity of an oncoming shift element to initiate slip across an off-going shift element;
- and
- during an inertia phase of the upshift, adjusting a torque capacity of the off-going shift element based on a signal from a torque sensor to limit a transmission output torque, wherein the torque sensor directly senses the transmission output torque.
A method comprising:
- during a torque phase of a transmission upshift, increasing a torque capacity of an oncoming shift element to initiate slip across an off-going shift element while controlling a torque capacity of the off-going shift element to a non-zero level;
- and
- during an inertia phase of the upshift, adjusting the torque capacity of the off-going shift element in response to a signal from a torque sensor to limit a transmission output torque, wherein the torque sensor directly senses the transmission output torque.
Dependencies are inferred from the claim text.