A method for learning engine clutch delivery torque of a hybrid vehicle includes: determining, by a controller, whether power transference of a transmission transmitting output from an engine of the vehicle and a motor of the vehicle is interrupted; controlling, by the controller, a speed of the motor to be maintained at a first speed when the power transference of the transmission is interrupted; calculating, by the controller, a first delivery torque of an engine clutch that connects the engine with the motor or disconnects the engine from the motor, based on the first speed and a second speed of the motor which is generated after the engine clutch is engaged; controlling, by the controller, the speed of the motor to be maintained at the second speed by releasing the engine clutch after the first delivery torque is calculated; and calculating, by the controller, a second delivery torque of the engine clutch based on the second speed and a third speed of the motor which is generated after the engine clutch is engaged.

While a vehicle is traveling in a state where any one of gear positions of a mechanical stepped transmission unit is established, until an estimated input torque that is obtained from the equation of motion for an electrical differential unit changes, a hydraulic pressure of a non-engaged intended hydraulic friction engagement device is increased, and a pack end pressure is learned on the basis of the hydraulic pressure at that time. Therefore, irrespective of feedback control, or the like, over motor generators of the electrical differential unit, it is possible to appropriately learn the pack end pressure, so it is possible to appropriately execute hydraulic control over the hydraulic friction engagement devices, that is, engaging and releasing control, or the like, at the time of shifting, irrespective of individual differences of the portions, aging of friction materials, or the like.

A method for learning a contact point of an engine clutch configured to control connection of power between an engine and a motor of a hybrid vehicle is provided. The method includes performing a first learning of the contact point of the engine clutch by increasing a contact speed of the engine clutch and storing information of a first contact point learned by the first learning. A second learning of the contact point of the engine clutch is then performed by decreasing the contact speed of the engine clutch.

While a vehicle is traveling in a state where any one of gear positions of a mechanical stepped transmission unit is established, until an estimated input torque that is obtained from the equation of motion for an electrical differential unit changes, a hydraulic pressure of a non-engaged intended hydraulic friction engagement device is increased, and a pack end pressure is learned on the basis of the hydraulic pressure at that time. Therefore, irrespective of feedback control, or the like, over motor generators of the electrical differential unit, it is possible to appropriately learn the pack end pressure, so it is possible to appropriately execute hydraulic control over the hydraulic friction engagement devices, that is, engaging and releasing control, or the like, at the time of shifting, irrespective of individual differences of the portions, aging of friction materials, or the like.

A method for learning an engine clutch kiss point of a hybrid vehicle includes: controlling, by a controller, an engine clutch which connects an engine with a motor or disconnects the engine from the motor so that the engine clutch is engaged after the controller checks stop of the engine and of the motor and stabilization operation for a hydraulic pressure line of the engine clutch is performed; controlling the motor to have a certain speed after the stabilization operation; controlling the engine clutch to be engaged after speed of the motor is stabilized; determining whether torque variation of the motor when the engine clutch is engaged is equal to or greater than a threshold value; and determining a hydraulic pressure at which the torque variation is the threshold value as the kiss point of the engine clutch.

The present disclosure provides a control method and a control system of a dual clutch transmission for a vehicle. The method includes: a pre-engagement-determining step of determining whether any one of gears has been pre-engaged, by means of a controller; a clutch-moving step of generating an oscillation signal to the release input shaft and increasing a clutch position value of the release input shaft; and a signal-determining step of determining whether the oscillation signal generated to the release input shaft is sensed at the engagement input shaft.

A method for learning engine clutch delivery torque of a hybrid vehicle includes: determining, by a controller, whether power transference of a transmission transmitting output from an engine of the vehicle and a motor of the vehicle is interrupted; controlling, by the controller, a speed of the motor to be maintained at a first speed when the power transference of the transmission is interrupted; calculating, by the controller, a first delivery torque of an engine clutch that connects the engine with the motor or disconnects the engine from the motor, based on the first speed and a second speed of the motor which is generated after the engine clutch is engaged; controlling, by the controller, the speed of the motor to be maintained at the second speed by releasing the engine clutch after the first delivery torque is calculated; and calculating, by the controller, a second delivery torque of the engine clutch based on the second speed and a third speed of the motor which is generated after the engine clutch is engaged.

A method for learning an engine clutch kiss point of a hybrid vehicle includes: determining whether a kiss point learning condition of an engine clutch which connects an engine with a motor or disconnects the engine from the motor is satisfied; controlling a speed of the motor to a first speed; learning a first kiss point of the engine clutch by engaging the engine clutch so that the motor having the first speed is connected to the engine; controlling the speed of the motor to a second speed; learning a second kiss point of the engine clutch by engaging the engine clutch so that the motor having the second speed is connected to the engine; and selecting an average value of the first kiss point and the second kiss point as the engine clutch kiss point when a standard deviation thereof does not exceed a threshold value.

The invention relates to a method for determining an engagement point of a hybrid clutch in a hybrid vehicle; which hybrid clutch is actuated by a hydrostatic clutch actuator and disconnects or connects an internal combustion engine and an electric traction drive; the engagement point is determined by slowly actuating the clutch starting from a position in which the hybrid clutch is in the non-actuated state, and monitoring a moment of the electric traction drive when a defined increase in the momentum is detected. In a method in which engagement point adaptation is optimized, a current engagement point (tp) is adapted during operation of the hybrid vehicle using a start-up routine, by which a first engagement point is determined when the hybrid vehicle is started; the hybrid clutch is moved close to a previously determined engagement point, and starting from said last determined engagement point, the hybrid clutch is displaced further until the defined increase in the moment is detected.

A method for learning a touch point of an engine clutch for a hybrid electric vehicle includes controlling a speed of an engine to have an idle speed. A fluid pipe of a clutch actuator is refilled with a working fluid by driving a driving motor in an idle control state of the engine, a speed of the driving motor is synchronized with the speed of the engine, and then the engine clutch is engaged. The engine clutch is released after the refill is performed, and the speed of the driving motor is decreased. A working fluid is applied so that the engine clutch is operated in an engagement direction by operating the clutch actuator, and a state change of the driving motor is detected. The touch point of the engine clutch is determined based on the state change of the driving motor.