Patent ID: 8534182

Claim:
A hydraulic control system for a valve train comprising: an oil reservoir; an oil pump fluidly connected to the oil reservoir; at least one engine component in fluid communication with the oil pump and the oil reservoir; an oil control valve in fluid communication with the oil reservoir and the oil pump; wherein the oil enters the oil control valve prior to the at least one engine component; and wherein the oil control valve includes: a housing defining a first chamber, a second chamber and a third chamber; a wall of the housing located between the first and the second chamber; wherein the wall defines an orifice to form a valve seat; a flexible diaphragm mounted to the housing and forming a second wall between the second chamber and the third chamber; a valve member mounted on the flexible diaphragm and including a poppet, wherein the valve member extends through the orifice and is moveable relative to the valve seat based upon a change in fluid pressures within at least one of the first chamber, the second chamber, and the third chamber; a solenoid valve to selectively fluidly connect the first chamber to the third chamber; and wherein the solenoid valve fluidly connects the third chamber to the fluid reservoir when the first chamber is fluidly disconnected from the third chamber.