Method and apparatus for determining and controlling torque induced rotation
 A torque transmitting rotating body in the vehicle has a desired rotational direction during vehicle travel in response to an operator demand. Rotation of the body is determined by a speed sensor which provides a signal to a control system. The control system determines the direction of rotation from consecutive speed signals and a known input torque. The control then issues the appropriate commands to ensure the direction of rotation of the body is in accordance with the operator demand. 
General Motors Corporation
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William Robert Steven Patrick
Mayhew Moorman