Patent ID: 9410585
Filing Date: 2016-08-09
CPC Classification: F16D

Claim Text:
1. A method of learning operation of an engine clutch of a hybrid electric vehicle which connects and cuts off power between an engine and a motor by engaging or disengaging the engine with the motor, the method comprising: determining, by a control unit, whether power transmission of a transmission that transmits output from the engine and the motor has been interrupted; operating, by the control unit, the engine and the motor at different speeds; setting, by the control unit, a torque of the motor as a first steady state torque when speed of the motor reaches a first steady state; increasing, by the control unit, a pressure of the engine clutch to engage the engine with the motor; after engaging the engine with the motor setting, by the control unit, the pressure to change torque of the motor from the first steady state torque to a predetermined torque as a start pressure of torque transmission; supplying, by the control unit, learning pressure that is greater than the start pressure of the torque transmission to the engine clutch to engage the engine with the motor; after engaging the engine with the motor, setting, by the control unit, the torque of the motor as a second steady state torque when speed of the motor reaches a second steady state; and learning, by the control unit, a linear relation between pressure of the engine clutch and the torque transmitted through the engine clutch based on a ratio of a difference value between the start pressure of the torque transmission and the learning pressure and a difference value between the first steady state torque and the second steady state torque, wherein when the transmission is in park or neutral, the power transmission of the transmission is determined, by the control unit, to have been interrupted, wherein the learning of the linear relation between the pressure of the engine clutch and the torque transmitted through the engine clutch includes: wherein the engine clutch is disposed between the engine and the motor.