Patent ID: 6961646
Filing Date: 2005-11-01
Classification: F16H,Y10S,Y10T

Abstract:
1. A multiple-ratio automatic transmission for an automotive vehicle comprising: two gearsets for providing multiple torque flow paths between an engine and vehicle traction wheels, each gearset being characterized by at least two ratios that define multiple overall transmission ratios; each gearset including a pressure-actuated friction element for establishing an upshift and a downshift between the two ratios; a first controller for controlling pressure at the pressure-actuated friction element of one gearset; and a second controller for controlling pressure at the pressure-actuated friction element of the other gearset; one gearset being upshifted as the other gearset is simultaneously downshifted, thereby effecting a swap-shift in an overall transmission ratio; the first and second controller having dynamic interaction compensation whereby a pressure change in one of the friction elements will command a pressure change in the other friction element during a time progression of the swap-shift, which results in improved quality of the swap-shift in the overall transmission ratio.