SHIFT CONTROL DEVICE OF AUTOMATIC TRANSMISSION FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To quickly provide desired driving force via completion of a second down-shift by quickly changing an input shaft rotating speed up to a synchronous rotting speed while preventing racing of a motive power source in a shift control device of an automatic transmission for a vehicle for performing torque-down control when performing its second down-shift by determining the second down-shift in first down-shift operation. SOLUTION: This shift control device is constituted so that when determining a 3→2 down-shift in 4→3 down-shift operation, a turbine rotating speed NT is quickly increased by engine torque for performing the torque-down control (reducing throttle valve openingθTH) by waiting until the turbine rotating speed NT becomes a rotating speed or more lower by a predetermined value n1 than a 2nd synchronous rotating speed, and the desired driving force is quickly provided by quickly performing the 3→2 down-shift while preventing the racing of an engine. COPYRIGHT: (C)2007,JPO&INPIT