EXHAUST EMISSION CONTROL DEVICE

• Main Authors: TAN ISAO, SASAKI KOKICHI
• Format: Patent
• Language: English; Japanese
• Published: 02.09.2021
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

To enhance a removal ratio of hydrocarbon at low cost.SOLUTION: An exhaust emission control device 200 includes a first catalyst (front stage catalyst 210) provided in an exhaust pipe 160, a bypass pipe 230 branched from the upstream side of the first catalyst in the exhaust pipe 160 and reconnected to the upstream side of the first catalyst in the exhaust pipe 160, a second catalyst (auxiliary catalyst 240) provided in the bypass pipe 230, and a changeover control section 272 for switching a passage path of exhaust gas to the bypass pipe 230 on the basis of a degree of deterioration of the first catalyst.SELECTED DRAWING: Figure 2 【課題】炭化水素の除去率を低コストで向上させる。【解決手段】排気ガス浄化装置２００は、排気管１６０内に設けられる第１触媒（前段触媒２１０）と、排気管１６０における第１触媒の上流側から分岐され、排気管１６０における第１触媒の上流側に再接続されるバイパス管２３０と、バイパス管２３０に設けられる第２触媒（補助触媒２４０）と、第１触媒の劣化度に基づき、排気ガスの通過経路をバイパス管２３０に切り換える切換制御部２７２と、を備える。【選択図】図２