An apparatus for continuously varying the valve opening period and method for controlling by means of the same

Apparatus and method for continuously varying the valve opening period, comprising a plurality of wheels (60) mounted on a cam shaft (30), each wheel (60) comprises a wheel chock (62) and corresponding to respective cylinders, a plurality of cam units variable (70), each of the cam units (70) cams (71, 72) and a cam wedge (74) and the camshaft (30) in the cams (71, 72) is inserted, and wherein the cam units (70) have relative phases of the cams (71, 72) with respect to the camshaft (30) and correspond to the respective cylinders, a plurality of inner retainers (80) each with the wheel chock (62) and the cam wedge (74) are connected a plurality of valve housings (90) into which the inner holder (80) are rotatably inserted, wherein the valve housing (90) are vertically movable with respect to an internal combustion engine optionally, a control device (100), the positions of Drehmit telpunkten the inner holder (80) by changing positions of the slide housing (90) is adjusted, and a guide unit (110) that guides the slide housing (90), whereby a pumping loss is controlled by the internal combustion engine by controlling the opening time of a valve (200) ,