Patent ID: 9157339
Filing Date: 2015-10-13
Classification: F01L

Abstract:
1. An engine valve actuation system for an internal combustion engine that includes an engine block, a cylinder head mounted to the engine block to form at least one combustion chamber and defining a first port and a second port, a first valve arranged at least partially within the first port and movable between an opened position and a closed position to selectively open the first port, a second valve arranged at least partially within the second port and movable between an opened position and a closed position to selectively open the second port, and a rotating cam mechanically coupled to the first valve to selectively move the first valve between the open and closed positions, the engine valve actuation system comprising: a hydraulic valve actuator coupled to the second valve to selectively move the second valve between the open and closed positions, the hydraulic valve actuator comprising: an actuator housing having a piston cavity, an inlet port, a high pressure port in fluid communication with a high pressure fluid conduit, and a low pressure port in fluid communication with a low pressure fluid conduit, a piston disposed at least partially within the piston cavity and having a first surface at a first end in fluid communication with the inlet port, the first surface and actuator housing defining a volume, and an actuator valve disposed within the actuator housing in fluid communication with the inlet port, the high pressure port, the low pressure port and the volume through the inlet port.