Abstract: A powertrain system includes a torque generating device to transfer torque to a driveline via a CVT, wherein the CVT includes a first pulley coupled to a second pulley via a flexible continuous device to transfer torque therebetween. A controller including a processor and memory is operatively connected to the CVT. The controller includes an instruction set that is executable to dynamically monitor operating parameters associated with an input force and an output force of the CVT and determine an amplitude variation of one of the operating parameters. The controller is disposed to detect an impending slip event based upon the amplitude variation, wherein the impending slip event is associated with a macro-slip condition on the flexible continuous device. Operation of the CVT is controlled to preclude the impending slip event.

Abstract: A powertrain system includes a torque generating device to transfer torque to a driveline via a CVT, wherein the CVT includes a first pulley coupled to a second pulley via a flexible continuous device to transfer torque therebetween. A controller including a processor and memory is operatively connected to the CVT. The controller includes an instruction set that is executable to dynamically monitor operating parameters associated with an input force and an output force of the CVT and determine an amplitude variation of one of the operating parameters. The controller is disposed to detect an impending slip event based upon the amplitude variation, wherein the impending slip event is associated with a macro-slip condition on the flexible continuous device. Operation of the CVT is controlled to preclude the impending slip event.