公开(公告)号：US10323579B2

公开(公告)日：2019-06-18

申请号：US15386627

申请日：2016-12-21

Applicant: Caterpillar Inc.

Inventor： Kendall Dean Yeager ,  Kevin James Schreader ,  Victor Iskander Yacoub

IPC: F02D13/02 ,  F01L13/00 ,  F01L9/02 ,  F01L1/18 ,  F01L1/047

Abstract: A valve actuation system is disclosed for an engine. The valve actuation system may have a variable valve actuator that is configured to engage a rocker arm and hold the valve at an open position regardless of motion of a cam lobe. The variable valve actuator may have a housing forming a chamber, a plunger disposed in the chamber, a control valve movable to control a flow of fluid into the chamber, and a relief valve configured to automatically open and release fluid from the housing when a pressure inside the chamber is below a predetermined pressure. The valve actuation system may further have a controller configured to cycle the control valve prior to start-up of the engine and to selectively move the control valve after start-up.