Cda rocker arm system to which dual oil supply line is applied and method of controlling the same

A CDA rocker arm system comprising:

• a rocker arm;
• a rocker pin configured to generate a lost motion of the rocker arm for cylinder deactivation (CDA) by a hydraulic operation of an oil;
• an oil control valve (OCV) configured to control the oil;
• an oil supply line comprised of a primary oil line connected from the OCV to one side of the rocker arm to supply the oil, and a secondary oil line connected from the OCV to an other side of the rocker arm to supply the oil;
• and
• a control unit configured to control the OCV by opening the primary oil line and blocking the secondary oil line when the CDA is operated, and control the OCV by opening the secondary oil line and blocking the primary oil line when the CDA is not operated;
• wherein the oil supply line further includes a bypass oil line;
• and
• wherein the bypass oil line returns the oil supplied from the primary oil line and the secondary oil line to the rocker pin from the rocker pin toward the OCV.