| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a torque point learning method of a wet frictional clutch, learning the optimum torque point even when the temperature of hydraulic fluid is low. <P>SOLUTION: In this torque point learning method of the clutch 3, a valve means 16 for controlling the oil pressure supplied to the wet friction clutch 3 is controlled to open and close on the basis of a duty ratio of a duty pulse output from an electronic control unit 11 to control the connection and disconnection of the wet type friction clutch 3, the duty ratio to realize the half-clutch state of the wet friction clutch 3 is learnt as a torque point. The oil temperature of hydraulic fluid whose pressure controlled by the valve means 16 is measured, and when the oil temperature is equal to or lower than a predetermined value, the frequency of a duty pulse is made lower than that in the normal clutch control, thereby gradually increasing or gradually decreasing the duty ratio to detect the half-clutch state of the wet friction clutch 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
