Patent ID: 8954247
Filing Date: 2015-02-10
Classification: F16H

Abstract:
1. A power transmission apparatus comprising: a continuously variable transmission comprising: a clutch disposed in series to the continuously variable transmission between the drive source and the drive wheel; a drive condition determination device configured to determine whether the vehicle is under a drive condition in which an output torque of the drive source is decreasing; an input torque calculator configured to calculate an input torque comprising: a belt transfer torque calculator configured to calculate a transfer torque of the belt based on at least a clutch transfer torque controller configured to calculate a transfer torque of the clutch based on the input torque calculated by the input torque calculator, the clutch transfer torque controller controlling the transfer torque of the clutch so that the transfer torque of the clutch is higher than or equal to the input torque calculated by the input torque calculator and is lower than the transfer torque of the belt calculated by the belt transfer torque calculator if it is determined that the vehicle is under the drive condition, wherein the predetermined friction coefficient of the belt is determined, using a parameter used for controlling the continuously variable transmission, from among friction coefficients comprising lower limits that are obtained while the belt is being used for a predetermined period of time.