DOWNSHIFT CONTROL DEVICE FOR AUTOMATIC TRANSMISSION AND DOWNSHIFT CONTROL METHOD FOR AUTOMATIC TRANSMISSION

摘要

This downshift control device is provided with an engine 1, an automatic transmission 3, and an AT controller 10. The AT controller 10 includes a downshift downshifting progress processing unit that, when a downshift request is a request for power-on downshift which is caused by reduction in the vehicle speed with a predetermined accelerator opening APO maintained, performs pressure release control based on a release element command and pressure application control based on an engagement element command. When executing the power-on downshift, the downshift downshifting progress processing unit holds, until an inertia phase Ph3 ends, the release element command for a release element to start slippage during the elapse of a release capacity reduction phase Ph2. Accordingly, when power-on downshift which is caused by reduction in the vehicle speed is executed, a G step at an ending time of the inertia phase is made lesser so that discomfort provided to an occupant can be suppressed.