POST-PROCESSING SYSTEM APPARATUS AND CONTROL METHOD

摘要

A post-processing system apparatus and a control method according to the present disclosure include: an exhaust pipe which has one end that is connected with an engine so as to allow exhaust gas to flow thereinto, and the other end that is opened to discharge the exhaust gas; a DOC which primarily reduces soot and smoke in the exhaust gas flowing into the exhaust pipe; a DPF which secondarily reduces soot and smoke in the exhaust gas passing through the DOC; an SCR which reduces NOx (nitrogen oxide) in the exhaust gas passing through the DPF; an AOC which oxidizes ammonia in the exhaust gas passing through the SCR and reduces NOx (nitrogen oxide); a first bypass pipe which branches off from the exhaust pipe between the engine and the DOC and bypasses the entirety or a part of the exhaust gas to a front end of the SCR; and a first switch which is provide at a point where the first bypass pipe branches off from the exhaust pipe in order to control an amount of exhaust gas that is bypassed to the first bypass pipe.