Steuerung für den geregelten Eingriff einer flüssigkeitsbetriebenen Drehmomentübertragungseinrichtung

摘要

An electronically mechanized control apparatus for regulating the engagement rate or stroke time of a fluid operated torque transmitting device (14), wherein the flow rate is controlled through a coordinated control of the supply pressure and an on-off fluid restriction device. At the initiation of a shift involving engagement of the rate controlled torque transmitting device, an appropriate stroke time is determined in terms of a suitable combination of line pressure and fluid restriction to be commanded for the duration of the shift. The on-off fluid restriction device (30) comprises a first orifice (80) which always remains in the servo supply circuit and second orifice (86) which is selectively connected in parallel with the first orifice via a solenoid operated shuttle valve (84).