SELF-CONTAINED COMPRESSION BRAKECONTROL MODULE FOR COMPRESSION-RELEASE BRAKESYSTEM OF INTERNAL COMBUSTION ENGINE

摘要

A compression-release brake system (12) for operating an exhaust valve (18) of an engine during an engine braking operation. The compression-release brake system comprises a self- contained compression brake control module (CBCM) (40) operatively coupled to the exhaust valve for controlling a lift and a phase angle thereof and a source (34) of a pressurized hydraulic fluid. The CBCM includes a casing (42) defining piston and actuator cavities (44, 45), a slave piston (48) mounted within the piston cavity, a check valve (62) provided between a supply conduit (60) and a slave piston chamber (50) and a compression brake actuator (70) disposed in the actuator cavity. The compression brake actuator includes an actuator element (72) and a biasing spring (78). The actuator element selectively engages the check valve when deactivated so as to unlock the slave piston chamber, and disengages from the check valve when activated so as to lock the slave piston chamber. The actuator element is exposed to atmospheric pressure.