Method of learning torque-stroke curve of electric motor controlled dry clutch system

A method for learning a torque-stroke (T-S) curve of an electric motor controlled dry clutch system, the method comprising:

• calculating, by a control unit, a position change value A for allowing a position change point P3 corresponding to an arbitrary torque y3 on a previous T-S curve C1 to follow-up and be moved to an expectation T-S curve C3;
• calculating, by the control unit, a probability Pr_X3 to allow a consideration of various environmental factors of a clutch based on a maximum value of a valid range in which the position change value A varies, and multiplying the probability Pr_X3 to the position change value A to calculate a final position change value A;
• calculating, by the control unit, a new point P3 by applying the final position change value A to the position change point P3 of the previous T-S curve C1, and generating a final T-S curve connecting the new point P3 and a touch point;
• and
• controlling, by the control unit, a stroke of an electric motor based on the final T-S curve so that a dry clutch transmits a target torque from an engine, the electric motor changing a position of the dry clutch.