Abstract: A torque transfer device for a motor vehicle includes a clutch for transferring torque between first and second shafts. An electromagnetic actuator includes an axially moveable armature for applying an application force to the clutch. An actuator control system includes a force sensor positioned within a clutch actuation force load path and is operable to output a signal indicative of a force applied to the clutch. The control system includes a controller operable to control the electromagnetic actuator to vary the force applied to the clutch based on the force sensor signal. As an option, the actuator control system can include a position sensor operable to output a signal indicative of a position of the armature. The control system determines a target torque to be transferred by the clutch and a target armature position based on a previously determined clutch torque vs. armature position relationship.

Abstract: A torque transfer device (34) for a motor vehicle includes a clutch (50) for transferring torque between first and second shafts (76, 78). An electromagnetic actuator (98, 102) includes an axially moveable armature (102) for applying an application force to the clutch (50). An actuator control system includes a position sensor (118c) operable to output a signal indicative of a position of the armature (102). The control system determines a target torque to be transferred by the clutch (50) and a target armature position based on a previously determined clutch torque vs. armature position relationship. The control system varies an electrical input to the electromagnetic actuator (98, 102) to perform closed loop control of the armature position.

Abstract: A torque transfer device (34) for a motor vehicle includes a clutch (50) for transferring torque between first and second shafts (76, 78). An electromagnetic actuator (98, 102) includes an axially moveable armature (102) for applying an application force to the clutch (50). An actuator control system includes a position sensor (118c) operable to output a signal indicative of a position of the armature (102). The control system determines a target torque to be transferred by the clutch (50) and a target armature position based on a previously determined clutch torque vs. armature position relationship. The control system varies an electrical input to the electromagnetic actuator (98, 102) to perform closed loop control of the armature position.

Abstract: A hydraulic control system for a vehicle includes a brake control unit having a mechanically actuated master cylinder and an electric motor driven pump. The master cylinder and the pump are each adapted to separately provide pressurized fluid to a brake cylinder. A hydraulically actuated drive coupling selectively transfers torque between rotatable input and output shafts. The rotatable output shaft is adapted to drive a vehicle wheel. The hydraulic control unit is in receipt of pressurized fluid from the pump. The hydraulic control unit includes a valve moveable between a first position where the drive coupling is in communication with the pressurized fluid and torque is transferred by the coupling and a second position where the pressure of the fluid in the cavity is reduced to reduce the torque transferred by the coupling.

Abstract: A torque transfer device for a motor vehicle includes a clutch for transferring torque between first and second shafts. An electromagnetic actuator includes an axially moveable armature for applying an application force to the clutch. An actuator control system includes a force sensor positioned within a clutch actuation force load path and is operable to output a signal indicative of a force applied to the clutch. The control system includes a controller operable to control the electromagnetic actuator to vary the force applied to the clutch based on the force sensor signal.

Abstract: A torque transfer device for a motor vehicle includes a clutch for transferring torque between first and second shafts. An electromagnetic actuator includes an axially moveable armature for applying an application force to the clutch. An actuator control system includes a force sensor positioned within a clutch actuation force load path and is operable to output a signal indicative of a force applied to the clutch. The control system includes a controller operable to control the electromagnetic actuator to vary the force applied to the clutch based on the force sensor signal.

Abstract: A hydraulic control system for a vehicle includes a brake control unit having a mechanically actuated master cylinder and an electric motor driven pump. The master cylinder and the pump are each adapted to separately provide pressurized fluid to a brake cylinder. A hydraulically actuated drive coupling selectively transfers torque between rotatable input and output shafts. The rotatable output shaft is adapted to drive a vehicle wheel. The hydraulic control unit is in receipt of pressurized fluid from the pump. The hydraulic control unit includes a valve moveable between a first position where the drive coupling is in communication with the pressurized fluid and torque is transferred by the coupling and a second position where the pressure of the fluid in the cavity is reduced to reduce the torque transferred by the coupling.