SHIFT CONTROL DEVICE OF AN AUTO TRANSMISSION FOR SECURING THE PROGRESS OF AN INERTIA PHASE

摘要

PURPOSE: A shift control device of an auto transmission is provided to perform the release pressure control or fastening pressure control of a friction element in an inertia phase by gear ratio interpolation control, thereby preventing the instruction of unintended torque transfer capacity.;CONSTITUTION: A gear ratio interpolation controller outputs a torque instruction value obtaining torque transfer capacity acquired by interpolation calculation. If the gear ratio interpolation control starts, a gear ratio determining unit determines whether a real gear ratio is expect a vehicle range between gear ratio terminals escaped from an inertia phase start gear ratio. A torque instruction value maintenance unit stops the interpolation calculation of torque transfer capacity while the real gear ratio is expect the vehicle range between the gear ratio terminals, and maintains a torque instruction value acquiring the optimal torque transfer capacity in the inertia phase start gear ratio.;COPYRIGHT KIPO 2010