Fluid pressure control valve

An internal combustion engine comprising:

• a cylinder;
• a valve train system configured to open and close an entryway into the cylinder and having a hydraulic lash adjuster configured to control a clearance in the valve train;
• a pump configured to pressurize an oil;
• a gallery configured to supply the pressurized oil to the lash adjuster;
• and
• a valve assembly configured to provide feed-back control of the pressurized oil in a gallery, the valve assembly comprising:
• a housing;
• a pressure chamber;
• a first passage configured to provide continuous flow of oil through the gallery;
• a second passage configured to supply the pressurized oil from the pump to the gallery;
• a piston configured to move within the pressure chamber between a first position and a second position and having a third passage configured to establish fluid communication between the first passage and the pressure chamber, wherein the first position of the piston opens the second passage and the second position of the piston closes the second passage;
• and
• a spring disposed between the piston and the housing, the spring being configured to move the piston to the first position when pressure of the oil in the gallery is less than a threshold oil pressure value and permit the piston to move to the second position when pressure of the oil in the gallery is equal to or greater than the threshold oil pressure value.

A vehicle comprising:

• a drive element;
• and
• an internal combustion engine configured to generate torque for rotating the drive element, the engine having:
• a cylinder;
• a valve train system configured to open and close an entryway into the cylinder and having a hydraulic lash adjuster configured to control a clearance in the valve train;
• a pump configured to pressurize an oil;
• a gallery configured to supply the pressurized oil to the lash adjuster;
• and
• a valve assembly configured to provide feed-back control of the pressurized oil in a gallery, the valve assembly comprising:
• a housing;
• a pressure chamber;
• a first passage configured to provide continuous flow of oil through the gallery;
• a second passage configured to supply the pressurized oil from the pump to the gallery;
• a piston configured to move within the pressure chamber between a first position and a second position and having a third passage configured to establish fluid communication between the first passage and the pressure chamber, wherein the first position of the piston opens the second passage and the second position of the piston closes the second passage;
• and
• a spring disposed between the piston and the housing, the spring being configured to move the piston to the first position when pressure of the oil in the gallery is less than a threshold oil pressure value and permit the piston to move to the second position when pressure of the oil in the gallery is equal to or greater than the threshold oil pressure value.