Patent ID: 7197385
Filing Date: 2007-03-27
Classification: F16H

Abstract:
1. A method for adjusting a contact force between two frictionally-engaged torque-transmitting components of a motor vehicle drive system, said method comprising the steps of: determining from a value of at least one motor vehicle drive system operating parameter and transmission performance characteristics stored in an electronic control unit a preliminary adjusting value for a contact force between an endless torque-transmitting means and a pair of conical disks of a continuously variable transmission having a steplessly adjustable transmission ratio, wherein each pair of conical disks includes an axially fixed disk and an axially movable disk that is movable toward and away from an associated axially fixed disk, and wherein the transmission ration is steplessly adjustable by a change of contact radii at points of contact between the endless torque-transmitting means and the pairs of conical disks; determining a slippage regulator output value by comparing an actual slippage value from a measured transmission operating parameter with a target slippage value corresponding with the transmission operating parameter; and determining in the control unit a control variable that is a function of the preliminary adjusting value and the slippage regulator output value to adjust the contact force to be applied to the torque-transmitting components in order to provide a predetermined target slippage of the torque-transmitting components of the transmission.