Speed change control system for automatic transmission

摘要

A speed change control system for an automatic transmission, for selectively switching a plurality of speed change control modes of different speed change control contents to control a gear ratio of an automatic transmission disposed on an output side of a prime mover. A first speed change control mode is selected if an output demand for the prime mover is in a predetermined state, and the first speed change control mode is switched to a second speed change control mode, if a physical quantity relating to a speed of the prime mover is in a predetermined state when the first speed change control mode is selected.