Method of learning torque-stroke relationship of clutch
AssigneeHyundai Autron Co., Ltd.
InventorMin-Hyo Kim
Life of this patent
Estimating the term…
Abstract
Provided are a method of learning a torque-stroke relationship of a clutch, and more particularly, a clutch torque-stroke learning method in which, during a process of dividing a torque region on a torque-stroke curve (T-S curve) of a clutch into two or more regions and learning the T-S curve passing through two or more torque regions with different torque section values, by learning the curve for a first torque region (e.g., a high-torque region or a low-torque region) when the curve is learned for a second torque region with guaranteed reliability, it is possible to prevent a problem of the T-S curve not converging to a previously learned curve value when the T-S curve is continuously learned for the two or more different torque regions.
Claims6
A method of learning a torque-stroke relationship of a clutch, the method comprising:
- a region division step in which an engine torque region is divided into a plurality of regions by a control unit;
- a storage step in which a torque-stroke IT-S) curve is learned and stored, at a machine-readable storage medium, for each of the regions into which the torque region is divided in the region division step, wherein the T-S curve is a relationship curve between the engine torque and a stroke of an actuator, which moves the clutch;
- a learning direction determination step in which a learning direction is determined by the control unit according to a variation of the engine torque, wherein the variation of the engine torque includes a first direction when the engine torque decreases and a second direction when the engine torque increases;
- a reliability determination step in which a reliability of the T-S curve for a first region is determined by the control unit while the T-S curve is learned for a second region;
- and
- a learning point input step in which a learning point of the T-S curve for the first region is input by the control unit when the reliability of the T-S curve for the first region is an acceptable reliability in the reliability determination step,
- wherein the reliability determination step comprises:
- a temperature change determination step for determining a difference between a temperature upon the current learning and a temperature upon learning of a prestored T-S curve for a corresponding torque region;
- and
- a learning time determination step for determining a temporal difference between a time of the current learning and a time of the learning of the prestored T-S curve for the torque region,
- wherein when it is determined, in the temperature change determination step, the difference between the temperature upon the current learning and the temperature upon learning of the prestored T-S curve for the corresponding torque region is greater than or equal to a predetermined criterion, the reliability is determined as an unacceptable reliability,
- the difference between the temperature upon the current learning and the temperature upon learning of the prestored T-S curve for the corresponding torque region is lower than a predetermined criterion, the reliability is determined as the acceptable reliability,
- wherein when it is determined, in the learning time determination step, the temporal difference between the time of the current learning and the time of the learning of the prestored T-S curve for the corresponding torque region is greater than or equal to a predetermined criterion, the reliability is determined as the unacceptable reliability,
- the temporal difference between the time of the current learning and the time of the learning of the prestored T-S curve for the corresponding torque region is lower than a predetermined criterion, the reliability is determined as the acceptable reliability.
Dependencies are inferred from the claim text.