Patent ID: 6899068

Claim:
An engine valve actuation system, comprising: an actuation assembly having a body, a piston slidable relative to the body, and first, second, and third chambers defined between the piston and the body; a low pressure fluid source; a first fluid passage configured to connect the low pressure fluid source to the second chamber; a high pressure fluid source; a second fluid passage configured to connect the high pressure fluid source to the second chamber to allow the fluid to flow from the second chamber to the high pressure fluid source; a third fluid passage configured to connect the high pressure fluid source to the third chamber; and a control valve connected to the low pressure fluid source, to the high pressure fluid source, and to the first chamber, the control valve configured to move between a first position at which the high pressure fluid source is connected to the first chamber and a second position at which the low pressure fluid source is connected to the first chamber.