Method of learning touch point of dual clutch transmission

A method of learning a touch point of a dual clutch transmission, the method comprising:

• a learning section check step in which a clutch touch point is required to be learned in a section;
• a virtual gear ratio calculation step in which a virtual gear ratio is calculated using a current vehicle speed and a tire diameter;
• a virtual input shaft speed calculation step in which a virtual input shaft speed is calculated using the virtual gear ratio calculated through the virtual gear ratio calculation step;
• a touch application step in which a torque is applied to a non-drive shaft such that a non-drive shaft speed is equal to an engine speed;
• a touch point learning determination step in which whether to learn a touch point is determined depending on whether a predetermined condition is satisfied;
• and
• a touch point update step in which a newly learned touch point is determined and stored.