Patent ID: 7677212

Claim:
A hydraulic circuit, comprising: an added motion valve system including a piston, an actuator body having a bore, wherein the piston is disposed within the bore of the actuator body, wherein a portion of the bore includes an actuator volume formed by the piston and the actuator body, wherein the actuator body forms a first fluid port and a second fluid port that are in fluid communication with the actuator volume; a first solenoid valve in fluid communication with the actuator volume by way of the first fluid port; a second solenoid valve in fluid communication with the actuator volume by way of the second fluid port, wherein the second solenoid valve includes a proportional valve that provides means for introducing consistency to a delayed closing movement of an engine valve, and a seating movement of the engine valve, wherein the introduced consistency is provided by always exposing fluid communication to the actuator volume by way of the second port and by adjusting an opening provided by a valve flow orifice of the proportional valve to compensate for different viscosities of the fluid in relation to the operating temperature of the fluid as the fluid is pumped from the actuator volume by way of the second port; a temperature sensor coupled to a controller, wherein the controller is coupled to the second solenoid valve, wherein the temperature sensor and controller provides means for detecting an operating temperature of fluid in the hydraulic circuit for adjusting a flow rate quantity of fluid into the actuator fluid volume as a function of the operating temperature of the fluid.