Patent ID: 9416873
Filing Date: 2016-08-16
CPC Classification: F16H

Claim Text:
1. A continuously variable transmission with a variator capable of continuously changing a speed ratio and a sub-transmission mechanism connected to an output side of the variator and configured to switch a gear position by changing engaged states of a plurality of frictional engagement elements, comprising: a coordinated shift unit configured to perform a coordinated shift of changing a speed ratio of the variator in a direction opposite to a speed ratio changing direction of the sub-transmission mechanism in shifting the sub-transmission mechanism; a power-on downshift determination unit configured to determine whether or not the shift of the sub-transmission mechanism is a power-on downshift caused by the depression of an accelerator pedal in the case of performing the coordinated shift; a feedback control unit configured to control a capacity of the frictional engagement element of the sub-transmission mechanism to be released according to a rotation speed feedback correction amount caused by a difference between a target input rotation speed and an actual input rotation speed of the sub-transmission mechanism if the shift of the sub-transmission mechanism is determined to be a power-on downshift; a rotation stagnation determination unit configured to determine whether or not an input rotation speed of the sub-transmission mechanism is stagnant; and an addition unit configured to add a rotation speed change rate feedback correction amount caused by a difference between a target input rotation speed change rate and an actual input rotation speed change rate of the sub-transmission mechanism to the rotation speed feedback correction amount when the input rotation speed is determined to be stagnant.