Patent ID: 6880393

Claim:
A method for controlling a clutch pressure during a power shift comprising the steps of: a.) changing a pressure in a first clutch over a predetermined first time interval while calculating a ratio of an input speed on an input side of the first clutch to an output speed on an output side of the clutch at predetermined second time intervals shorter than the first interval to determine whether the first clutch is slipping; b.) adjusting a rate of change of the pressure as a function of determined clutch slippage; c.) changing a pressure in a second clutch over the predetermined first time interval while calculating a ratio of an input speed on an input side of the second clutch to an output speed on an output side of the second clutch at predetermined second time intervals shorter than the first interval to determine whether the second clutch is slipping; and d.) adjusting a rate of change of the pressure in the second clutch as a function of the determined second clutch slippage.