Patent ID: 8706369

Claim:
A system for controlling a multiple-ratio automatic transmission for an automotive vehicle powertrain including an engine, a transmission input shaft, a transmission output shaft, gearing defining multiple torque flow paths from the input shaft to the output shaft, and first and second pressure actuated torque establishing elements for establishing a first gear configuration with a low speed ratio and a second gear configuration with a higher speed ratio during a ratio upshift event having a preparatory phase, a torque phase and an inertia phase, the system comprising: a first actuator for changing a torque capacity of the first torque establishing element; a first speed sensor for measuring a speed of a first portion of the powertrain; a second actuator for increasing a torque capacity of the second torque establishing element; a second speed sensor for measuring a speed of a second portion of the powertrain; a torque sensor for measuring a torque of a portion of the transmission; and a controller for estimating an amount of torque transmitted through the second torque establishing element based on the measured speeds and the measured torques and increasing the torque capacity of the second torque establishing element during the torque phase at a rate partially determined by the estimated amount of torque at the second torque establishing element for at least a portion of the torque phase.