Compression-release engine brake system for lost motion rocker arm assembly and method of operation thereof

A compression-release brake system for effectuating a compression-release engine braking operation in connection with an internal combustion engine comprising an engine cylinder that is associated with a four-stroke piston cycle comprising a compression stroke and an expansion stroke and is provided with at least one intake valve, at least one exhaust valve, and at least one exhaust valve return spring exerting a closing force on the exhaust valve to urge the exhaust valve into a seated state, the compression-release brake system comprising:

• a lost motion exhaust rocker assembly comprising a rocker arm;
• an actuation piston comprising an actuation piston body slidably received by a first pocket of the rocker arm to define a piston cavity in the rocker arm and movable between a piston retracted position and a piston extended position, the actuation piston configured to be operatively associated with an exhaust valve to permit unseating of the exhaust valve from the seated state, the actuation piston body having an actuation piston communication port and an actuation piston check valve configured to move between a first closed position and a first open position to provide a first hydraulic fluid flow pathway through the actuation piston communication port to the piston cavity;
• and
• a reset device received by a second pocket of the rocker arm, the reset device operatively associated with the actuation piston through at least one connecting conduit, and comprising a reset check valve configured to move between a second closed position and a second open position to provide a second hydraulic fluid flow pathway to the piston cavity, the second hydraulic fluid flow pathway comprising the at least one connecting conduit, the reset check valve further comprising a reset pressure control spring for applying a biasing force to the reset check valve to urge the reset check valve toward the second open position.