Patent ID: 8118707
Filing Date: 2012-02-21
Classification: B60W,F16H,Y10T

Abstract:
1. Method for controlling a friction clutch ( 3 ) and a continuously variable transmission ( 2 ) provided with a drive belt ( 23 ) wrapped around and in frictional contact with two variable pulleys ( 21 , 22 ) in a vehicular drive line, which method includes the step of activating the clutch ( 3 ) and the transmission ( 2 ) in relation to an engine torque (Te) generated by an engine ( 1 ) of the drive line, at least effecting that a torque level (Tc-max) transmissible by the clutch ( 3 ) is smaller than a torque level (Tt-max) transmissible by the transmission ( 2 ) and that a safety margin is realised between the torque level (Tt-max) transmissible by the transmission ( 2 ) and the engine torque (Te), wherein, said safety margin is adapted during operation by increasing or decreasing said safety margin at least in relation to and in proportion with one or more of: a normal force (Fn) is applied in the frictional contact between the belt (