Patent ID: 7237661

Claim:
A method of shifting a geared multi-speed transmission having a rotating input shaft that is adapted to rotate any one of a plurality of different gear sets, comprising: generating a control signal to a fill valve to disengage a clutch that connects an engine to the transmission; opening the fill valve to port a pressurized hydraulic fluid into a first fluid cavity that is defined by a housing and a clutch disconnect piston; shifting the clutch from a first clutch position to a second clutch position in which the clutch disconnect piston minimizes torque transmitted by the clutch; opening a valve to port the pressurized hydraulic fluid into a second fluid cavity that is defined by a housing and a brake piston; shifting the brake piston from a first brake position in which no braking force is applied to a rotor that rotates with the rotating input shaft to a second brake position in which a braking force is applied to the rotor; changing the gear set rotated by the input shaft; exhausting fluid from the second fluid cavity to allow the brake piston to move from the second brake position to the first brake position; and exhausting fluid from the first fluid cavity to allow the clutch disconnect piston to move from the second clutch position to the first clutch position to re-engage the clutch and allow the clutch to transmit torque, wherein the valve porting fluid to the second fluid cavity ports pressurized fluid directly through the housing independently of the first fluid cavity.