Patent ID: 8052577

Claim:
A torque converter for selectively providing a mechanical connection between a drive unit and a drive train, the torque converter comprising: a lockup clutch or a coupling device having a driving part connected to the drive unit and a driven part connected to the drive train; a control system for applying an apply pressure in a sense to cause frictional engagement between the driving part and the driven part and applying a release pressure in a sense to cause disengagement of the driving part and the driven part, wherein a differential between the apply and release pressures is progressively controllable by the control system so as to control the relative positioning between the driven part and the driving part; a valve for balancing the apply and release pressures, the valve receiving a first input hydraulic fluid and a second input hydraulic fluid; a first pressure regulator for regulating the pressure of the first input hydraulic fluid; and a second pressure regulator for regulating the pressure of the second input hydraulic fluid.