Patent ID: 7611441
Filing Date: 2009-11-03
Classification: B60K,B60W,Y10T

Abstract:
1. A power transmission device for use in a motor vehicle having a powertrain and first and second drivelines for transferring torque to vehicle wheels, comprising: a first rotary member operable for transferring drive torque from the powertrain to the first driveline; a second rotary member driving the second driveline; a multi-plate friction clutch operably disposed between said first and second rotary members; a clutch operator for applying a clutch engagement force on said friction clutch so as to transfer drive torque from said first rotary member to said second rotary member; a clutch actuator operable to control movement of said clutch operator relative to said friction clutch in response to a control signal; and a control system for generating said control signal and causing said clutch actuator to move said clutch operator to a predetermined position corresponding to a desired torque value that is transferred across said friction clutch prior to wheel slip, said desired torque value being a function of an input torque value applied to said first rotary member, and wherein said input torque value is determined as a function of a torque converter torque ratio, an engine torque value and a transmission gear ratio.