Patent ID: 8560189
Filing Date: 2013-10-15
Classification: F16H

Abstract:
1. A continuously variable transmission mounted on a vehicle, and arranged to vary a rotational speed of an engine, the continuously variable transmission comprising: a variator arranged to continuously vary a transmission ratio; a stepwise auxiliary transmission mechanism disposed in series with the variator, and arranged to switch between a first shift stage on a lower speed side and a second shift stage on a higher speed side by engagements and disengagements of a plurality of frictional elements; and a shift controller configured to calculate a desired target rotational speed of the engine based on a driving state of the vehicle, to set a desired through transmission ratio which is a target transmission ratio, based on the calculated desired target rotational speed, to vary at least one of the transmission ratio of the variator and the shift stage of the auxiliary transmission mechanism, and to control so that a through transmission ratio which is an entire transmission ratio of the variator and the auxiliary transmission mechanism follows the desired through transmission ratio by a predetermined response, the shift control section including: wherein the shift controller includes a desired target rotational speed increasing section configured to correct the desired target rotational speed of the engine to a larger side when the vehicle runs on the slope road and the vehicle runs on a steep slope road when the slope of the steep slope road is equal to or greater than 15%.