Patent ID: 8219293

Claim:
A gear shift control apparatus for an automatic transmission, comprising: gear shift control means for releasing a first frictional engagement element which has been engaged at a gear stage prior to a gear shift and to engage a second frictional engagement element which has been released at the gear stage prior to the gear shift to perform the gear shift to another gear stage; and inertia phase control means for temporarily reducing a command hydraulic pressure to the second frictional engagement element when a parameter indicating a degree of progress of the gear shift detected during the gear shift to the another gear stage has reached a predetermined value representing an inertia phase finish immediate prior region at a time of an inertia phase developed during a replacement gear shift, wherein the inertia phase control means includes finish pressure control means for setting a reduction quantity of the command hydraulic pressure whenever a predetermined time has elapsed on a basis of the parameter detected whenever the predetermined time has elapsed in the inertia phase finish immediate prior region to progressively reduce the command hydraulic pressure.