Patent ID: 6807472
Filing Date: 2004-10-19
Classification: F16H,Y10T

Abstract:
A system for controlling shifting in an automatic shifting gear change power transmission comprising:(a) a plurality of clutches, each operable upon actuation to effect torque transmission between a first and second rotatable member in said automatic transmission; (b) a plurality of hydraulically operated actuators, each operatively connected for effecting actuation and deactuation of one of said clutches; (c) a pump providing a source of pressurized hydraulic fluid; (d) a plurality of electrically operated pressure control valves, each receiving at its inlet said pressurized fluid from said pump, with each of said valves connected to control hydraulic pressure to one of said actuators; (e) an electronic controller operatively connected to provide electrical energization of each of said valves; and, (f) a plurality of pressure sensors, each disposed to sense the pressure supplied to one of said actuators by the corresponding valve and operable to provide an electrical signal indicative of said pressure to the controller, wherein actuation of each of said actuators effects a gear change in the transmission.