Patent ID: 8607751

Claim:
An electro-hydro valve lift (EHV) system comprises: a drive cam; a pump piston housing of which a main chamber is formed therein; a pump piston which is disposed within the pump piston housing and reciprocates according to operation of the drive cam; a pump piston elastic member which is disposed within the pump piston housing and supplies restoring force to the pump piston; a first and a second EHV apparatus disposed to each cylinder; a first oil control valve; a first oil control hydraulic line fluid-communicating the main chamber with the first oil control valve; a second oil control hydraulic line fluid-communicating the first oil control valve with the first EHV apparatus; a third oil control hydraulic line fluid-communicating the main chamber with the second EHV apparatus; a fourth oil control hydraulic line of which an end is selectively fluid-communicated with the second oil control hydraulic line according to operation of the first oil control valve and of which the other end is fluid-communicated with the third oil control hydraulic line; an accumulator fluid-communicated with the fourth oil control hydraulic line; and a second oil control valve which is disposed on the fourth oil control hydraulic line and selectively communicates the second EHV apparatus with the accumulator, wherein the fourth oil control hydraulic line is fluid-communicated with the third oil control hydraulic line according to operation of the second oil control valve.