Patent ID: 6695737
Filing Date: 2004-02-24
Classification: F16H,Y10T

Abstract:
A method for regulating line pressure with a regulator valve in an automatic transmission, wherein said transmission includes a plurality of ranges including at least a drive range, a neutral and a reverse range, said method comprising:providing hydraulic line pressure to the regulator valve on a first side of a valve spool; providing a range pressure to the regulator valve on the first side of the valve spool; providing a variable control pressure to the regulator valve on a second, opposite side of the valve spool; providing a separate biasing force on the valve spool acting with said variable control pressure; controlling the regulator valve to reach equilibrium between a resultant force of said variable control pressure and biasing force and a resultant force of the hydraulic line pressure and the range pressure for all ranges of the transmission except the reverse range.