Patent ID: 8157076

Claim:
A servo assembly for shifting a hybrid transmission between a first state of operation and a second state of operation, said servo assembly comprising: a valve housing having a first end and a second end and defining a valve chamber extending between said ends; a relay valve slidably disposed within said valve chamber between a first position and a second position; a park servo in fluid communication with said valve chamber and movable between a first condition to move the hybrid transmission to the first state of operation and a second condition to move the transmission to the second state of operation; a pressure supply port defined in said valve housing and opening to said valve chamber, and configured to selectively open to allow a fluid to enter said valve housing through said pressure supply port and move said park servo to said second condition; wherein said park servo is configured to move the hybrid transmission to the second state of operation when said park servo moves to said second condition; an exhaust valve defined in said housing, opening to said valve chamber, and configured to selectively open to exhaust fluid from said park servo and said valve housing when said pressure supply port is not open; a first solenoid operatively disposed in said first end of said valve housing and configured to transmit fluid into said valve chamber at a first fluid pressure to move said relay valve to said first position; and a second solenoid operatively disposed in said second end of said valve housing and configured to transmit fluid into said valve chamber at a second fluid pressure to move said relay valve to said second position.