Exhaust gas abatement apparatus using EGR system and control method thereof

摘要

In an EGR control system in which a certain amount of exhaust gas is recirculated to an engine, the negative pressure of the exhaust gas flowing into the engine is constantly maintained at a duty ratio of the engine that varies according to the operating state, The present invention relates to an exhaust gas reducing apparatus and an exhaust gas reducing apparatus using the EGR control system capable of improving exhaust gas purification efficiency and an exhaust gas recirculation system for recirculating a certain amount of exhaust gas to an engine, An EGR valve 60 for regulating the recirculation amount of the exhaust gas flowing into the tank 21, a primary negative pressure control valve 30 for regulating the negative pressure transmitted from the surge tank 21 to the EGR valve 60, And an ECU 50 that adjusts the opening degree of the secondary negative pressure control valve 40 so that the negative pressure detected by the negative pressure sensor 70 matches the negative pressure required by the duty ratio of the engine 10 .