Patent ID: 8820276

Claim:
A valve actuation system for controlling at least one engine valve, comprising: a) a hydraulic lost motion system having: (i) a first piston disposed in a first piston chamber, being moveable by an engine cam shaft, (ii) a second piston disposed in a second piston chamber; (iii) at least one engine valve being moveable by the second piston; and (iv) a hydraulic circuit configured to permit hydraulic communication between the first piston chamber and the second piston chamber; b) a solenoid valve in hydraulic communication with the hydraulic circuit; and c) a controller configured to selectively actuate the solenoid valve to permit a flow of fluid within the hydraulic circuit for controlling the operation of the at least one engine valve in response to (i) a temperature proximate a portion of the hydraulic lost motion system, (ii) an engine load value, (iii) at least one engine operating mode and (iv) an engine speed value.