Ratio shift control for a multiple ratio automatic transmission

Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission

Reexamination Certificate

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Details

C477S143000

Reexamination Certificate

active

07351183

ABSTRACT:
A gear ratio shift control and control method controls gear ratio upshifts in a multiple-ratio transmission for an automotive vehicle. Pressure actuated friction elements establish torque flow paths in transmission gearing as they are selectively engaged and released. A net torque reduction at a transmission torque output shaft during an upshift event is reduced by increasing transmission input torque prior to the start of the inertia phase of the upshift event.

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