Ratio selection method for a continuously variable transmission during deceleration by braking
A method and system for selecting a speed ratio for a continuously variable transmission (CVT) of a vehicle during braking. The method and system includes determining a Current Actual Speed Ratio of the CVT when the distance of a brake pedal travel exceeds a predetermined distance, determining, by a transmission control module (TCM), an amount of Available Speed Ratio Change (Δr), a Current Ratio Change Capability (Current-{dot over (r)}), and a Predictive Ratio Change Capability (Predictive-{dot over (r)}). The method further includes the TCM calculating a Time to Reach the Minimum Under-drive Ratio (tUD), calculating a Predicted Velocity of the Vehicle (vPr) using (tUD), determining a Desired Speed Ratio of the CVT using the Predicted Velocity of the Vehicle (vPr), and actuating the CVT to the Desired Speed Ratio.
GM GLOBAL TECHNOLOGY OPERATIONS LLC
F F F F F F F F F F F F
F16H F16H F16H F16H F16H F16H F16H F16H F16H F16H F16H F16H
additional additional additional additional additional additional additional inventional additional additional inventional additional
Steven P. Ronald W. Xuefeng T. Madhura N. Jeffrey M.
Moorman Van Diepen Tao Paranjape DeSimone