Patent ID: 8457847

Claim:
Method for monitoring torque in a powertrain including a transmission coupled to a driveline, the method comprising: monitoring signals from first and second rotational sensors located at respective first and second rotationally-coupled positions of the driveline separated by a distance along the driveline; determining rotation of the driveline at the first and second rotationally-coupled positions from said signals; determining a twist angle derived from a difference between the rotations of the driveline at the first and second rotationally-coupled positions; calculating a driveline torque corresponding to the twist angle; and controlling operation of the powertrain in response to the driveline torque; wherein signals from said rotational sensors comprise periodic signals, and wherein determining rotation of the driveline at the first and second rotationally-coupled positions from said signals comprises, for each respective rotationally-coupled position, determining an initial phase angle corresponding to an initial signal within a predetermined sample window; determining a final phase angle corresponding to a final signal within the predetermined sample window; determining an intermediate phase angle corresponding to the number of full signals between the initial signal and the final signal; and determining the rotation of the driveline at the respective rotationally-coupled position as a summation of the initial phase angle, the final phase angle and the intermediate phase angle.