Patent ID: 6415752
Filing Date: 2002-07-09
Classification: F01L

Abstract:
In an hydraulic valve actuation system for operating at least one valve of an engine during a plurality of engine operating conditions, wherein the valve actuation system includes a cam assembly having a plurality of lobes formed thereon for supplying motion to operate the at least one valve during the plurality of engine operating conditions, a valve actuating assembly having a first piston assembly for actuating the at least one valve, and a motion transfer assembly having a second piston assembly and a hydraulic circuit for transferring the motion from said cam assembly to said first piston assembly, the improvement comprising:control means for controlling the amount of motion transferred from said motion transfer assembly to said first piston assembly to control the actuation of the at least one valve during the plurality of engine operating conditions, wherein said control means includes a selectively actuatable accumulator, said selectively actuatable accumulator being located within said second piston assembly or within said first piston assembly.