Patent ID: 8857587
Filing Date: 2014-10-14
Classification: F16H

Abstract:
1. A method for operating an open 3-line type hydrodynamic coupling device, the hydrodynamic coupling device comprising: a housing arrangement that is one of filled with a fluid or fillable with a fluid; an impeller that is rotatable with the housing arrangement around an axis of rotation; a turbine arranged in the housing arrangement and coupled with a driven member for rotation around the axis of rotation; a lockup clutch that selectively produces a torque transmission connection between the housing arrangement and the driven member, wherein the lockup clutch comprises: displacing the clutch piston by a first fluid pressure in the engaging direction, the first fluid pressure provided in the first space for engaging the lockup clutch; displacing the clutch piston in the disengaging direction by a second fluid pressure provided in the second space for disengaging the lockup clutch; adjusting at least one of a fluid supply pressure for the first space and a fluid supply pressure for the second space based at least in part on at least one operating variable: wherein the at least one operating variable comprises at least one of: a temperature in the region of the coupling device, a fluid temperature in the region of the coupling device, and a loading of the coupling device in torque-transmission/conversion operation wherein when the lockup clutch is disengaged the fluid supply pressure for the second space is adjusted to a higher value when at one of a higher temperature and higher load than when at one of a lower temperature and lower load.