Continuously variable transmission and control method thereof

摘要

A transmission controller (12) permits a 2-1 shift, in which a gear position of a subtransmission mechanism (20) is changed from a second speed to a first speed, when an accelerator pedal has been depressed to or above a predetermined opening. The gear position of the subtransmission mechanism (30) is changed from the second speed to the first speed when an actual through speed ratio passes a mode switch line from a High side to a Low side while the 2-1 shift is permitted in the subtransmission mechanism (30).