Patent ID: 8855879

Claim:
A method of operating a clutch of a drive train of a motor vehicle, the method comprising the steps of: providing a transmission with at least one hydraulic clutch; filling the clutch for engagement, from a hydraulic supply, the clutch being filled up to a defined minimum pressure by a fast filling phase which comprises a basic filling phase and a second phase; measuring, via a pressure sensor, an actual clutch pressure at an end of the basic filling phase; immediately terminating the basic filling phase from the hydraulic supply when the actual clutch pressure is either equal to or larger than the minimum pressure; delaying termination of the basic filling phase by activating at least one of a pressure holding phase and a pressure surplus phase, when the actual clutch pressure is lower than the minimum pressure; and filling the clutch, during the basic filling phase, for a defined filling pulse characterized by a defined pulse duration and a defined pulse height, and extending the pulse duration in an event that the clutch pressure is lower than the minimum pressure at the end of the defined pulse duration.