Patent ID: 7107135
Filing Date: 2006-09-12
Classification: F16H,Y10T

Abstract:
1. A shift progression target command generator for a closed-loop controller for a multiple-ratio automatic transmission for an automotive vehicle, the transmission 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 closed-loop controller for controlling pressure at the pressure-actuated friction element of one gearset; and a second closed-loop 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; a shift progression and shift progression rate processing unit for the other gearset; the generator computing a command for one of the gearsets based on a first shift progression target for the one gearset, the first shift progression target corresponding to a first shift progression target for the other gearset, whereby shift progression of the one gearset is dependent on shift progression and shift progression rate of the other gearset; the target command generator using multiple sets of shift progression target values for the gearsets, each target value for the one gearset being dependent upon a target value for the other gearset; the first and second controllers having dynamic interaction whereby a pressure change in one of the friction elements will command a pressure change in the other friction element during progression of the swap-shift, which results in improved quality of the swap-shift in the overall transmission ratio.