Method of learning touch point of dual clutch transmission
AssigneeHyundai Autron Co., Ltd.
InventorMin-Hyo Kim
Life of this patent
Estimating the term…
Abstract
Provided is a method of learning a touch point of a dual clutch transmission (DCT), and more particularly, to a DCT touch point learning method in which a touch point is learned based on a difference between a virtual input shaft speed and a clutch non-drive shaft input speed using a virtual input shaft reference speed calculated based on the speed of a traveling vehicle. In a traveling situation in which the touch point cannot be learned using the non-drive shaft according to the related art because the input shaft behavior of the non-drive shaft is rotationally synchronized with the input shaft behavior of the drive shaft by drag characteristics of the DCT, a virtual input shaft speed may be calculated, and the touch point of the clutch may be learned using the virtual input shaft speed.
Claims7
A method of learning a touch point of a dual clutch transmission, the method comprising:
- checking, at a learning section check step, a learning section in which a clutch touch point is required to be learned;
- calculating, at a virtual gear ratio calculation step, a virtual gear ratio using a current vehicle speed and a tire diameter;
- calculating, at a virtual input shaft speed calculation step, a virtual input shaft speed using the virtual gear ratio calculated through the virtual gear ratio calculation step;
- applying, at a torque application step, a torque to a non-drive shaft such that a non-drive shaft speed is equal to an engine speed;
- determining, at a touch point learning determination step, whether to learn a touch point depending on whether a predetermined condition is satisfied;
- and
- determining and storing, at a touch point update step, a newly learned touch point, wherein the newly learned touch point is determined using the virtual input shaft speed.
Dependencies are inferred from the claim text.