Variable engine valve control system with hydraulic damper

摘要

A variable valve assembly, engine valve control system, and method of operation wherein the valve is hydraulically controlled and includes a valve piston subjected to fluid pressure acting on surfaces at both ends of the valve piston. The cavity at one end of the valve piston is connected to a source of high pressure fluid while the cavity at the other end is connected to a source of high pressure fluid and a source of low pressure fluid, and disconnected from each through action of controlling means such as solenoid valves. The valve assembly includes a damper to limit the velocity of the valve during a portion of the travel of the piston, particularly as the valve head lands on the valve seat.