Im working on a model in SIMULINK of an electric drivetrain with an automatic transmission.. The overall goal is to develop an algorithm controlling controlling a CVT via factors such as current, angular velocity, etc. This may seem very basic to most of you, but i know that Output torque = torque Produced by engine X Gear Ratio . How would one go about finding the gear ratio, is there anyway to find the amount of torque required for a given situation based on things like current and angular velocity? I know how to calculate the torque produced by the motor, but is there anyway to calculate the outside forces acting on the motor in order to determine the gear ratio.