Patent ID: 6189504
Filing Date: 2001-02-20
Classification: F01L,F02D,F02M

Abstract:
A system for providing compression release engine braking for at least one engine valve said system comprising:a means for providing a valve train motion;a first valve actuation subsystem for providing valve actuation for a full compression release event and valve actuation for an initial portion of a main exhaust event during engine braking, said first valve actuation subsystem being operatively connected to the valve train motion means and the engine valve; anda second valve actuation subsystem for providing valve actuation for a latter portion of said main exhaust event during engine braking, said second valve actuation subsystem being operatively connected to the valve train motion means and the engine valve,wherein said first valve actuation subsystem includes a slave piston disposed in a bore comprising:an outer piston sleeve slidably disposed and biased into the bore, said outer piston sleeve having an end wall and a side wall, and having a first passage through the end wall and a second passage through the side wall;an inner piston slidably disposed within the outer piston sleeve;an interior portion within the outer piston sleeve, said interior portion communicating with said first and second passages and being adapted to receive hydraulic fluid therein; anda check valve adapted to selectively block the first passage.