Patent ID: 9376941
Filing Date: 2016-06-28
CPC Classification: F01L,F02D

Claim Text:
1. A method for resetting a valve lift for an integrated engine brake, comprising a process of utilizing a motion of a cam to open an engine exhaust valve through a rocker arm and a valve bridge of an engine, wherein the rocker arm or the valve bridge is provided with a braking piston and a hydraulic flow passage, and the braking piston is connected to the hydraulic flow passage, wherein the process comprises the following steps: placing the braking piston at an extended position by supplying pressure to the hydraulic flow passage, providing a reset valve between the rocker arm and the valve bridge, wherein the reset valve does not transfer load from the cam to the engine exhaust valve, connecting the reset valve to a reset flow passage located in the rocker arm or the valve bridge, connecting the reset flow passage to the hydraulic flow passage, utilizing a change of a distance between the rocker arm and the valve bridge to open and close the reset valve, opening the reset valve when a valve lift of the engine exhaust valve enters into its top portion, releasing hydraulic pressure in the hydraulic flow passage through the reset flow passage, retracting the braking piston by a gap, eliminating a part of a motion transmission between the cam and the engine exhaust valve, reducing the valve lift of the engine exhaust valve, and during a returning process of the valve lift of the engine exhaust valve after passing its maximum position, closing the reset valve to resume pressure supply in the hydraulic flow passage, placing the braking piston at the extended position, and re-establishing the motion transmission between the cam and the engine exhaust valve.