Patent ID: 7729837
Filing Date: 2010-06-01
Classification: F16H,Y10T

Abstract:
1. A control apparatus for a continuously variable transmission provided in a vehicle, the continuously variable transmission having a drive pulley the width of a groove of which is varied using an actuator, a driven pulley the width of a groove of which is varied using an actuator, and a belt wound around the drive pulley and the driven pulley, the diameter of the belt loop at the drive pulley and the diameter of the belt loop at the driven pulley being variable to change the speed ratio of the continuously variable transmission, the control apparatus comprising: a speed detection portion that detects a physical quantity corresponding to a speed of the vehicle; a determination portion that determines whether predetermined conditions that have an influence on the returnability of the belt of the continuously variable transmission are satisfied, based on a state of the vehicle; and a control portion that, when the vehicle is traveling on an uphill road, executes a first shift control mode for controlling the continuously variable transmission so that the speed ratio of the continuously variable transmission is brought to a speed ratio that secures a sufficient climbing performance of the vehicle if it is determined that predetermined conditions are not satisfied and executes a second shift control mode for controlling the continuously variable transmission so that the speed ratio of the continuously variable transmission is brought to a speed ratio that secures a sufficient returnability of the belt if it is determined that the predetermined conditions are satisfied, wherein the predetermined conditions are that the detected speed is equal to or lower than a reference vehicle speed that is set in accordance with the gradient of the uphill road and that a first target speed ratio that is set in accordance with the state of the vehicle when the first shift control mode is selected is equal to or lower than a second target speed ratio that is set in accordance with the state of the vehicle when the second shift control mode is selected.