DEVICE FOR PURIFYING AN EXHAUST GAS, CAPABLE OF IMPROVING THE PURIFICATION EFFICIENCY OF THE DEVICE BY USING A RECIRCULATION LINE

摘要

PURPOSE: A device for purifying an exhaust gas is provided to improve the durability of a post injector by supplying a exhaust gas to a first by-pass line by a control valve when fuel is ejected through a post injector.;CONSTITUTION: An exhaust gas purification device includes a first purification device(110), a second purification device(120), a first by-pass line(140), a post injector(170), and a control valve(145). The first purification device is installed in the front of the main exhaust line connected to the engine(100). The second purification device is installed at the end of the first purification device. The first by-pass line is branched from a main exhaust line between the engine and the first purification device. The post-injector is installed in the first by-pass line and additionally injects fuel. A control valve is installed in the first by-pass line at the front of the post injector shear and selectively supplies the exhaust gas.;COPYRIGHT KIPO 2010