EXHAUST EMISSION CONTROL SYSTEM

• Main Authors: FURUKAWA KENGO, MOTOO KOHEI
• Format: Patent
• Language: English; Japanese
• Published: 15.11.2018
• 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

PROBLEM TO BE SOLVED: To provide an exhaust emission control system capable of highly accurately estimating poisoning amount of substances poisoning an NOx catalyst.SOLUTION: An exhaust emission control system 1 for purifying exhaust gas from an engine 10 includes an NOx catalyst 21, a hydrocarbon supply section 31 and a poisoning amount estimation section 41. The NOx catalyst 21 is provided in an exhaust passage 12 of the engine 10. The hydrocarbon supply section 31 supplies hydrocarbon to the NOx catalyst 21. Based on a temperature and flow rate of exhaust gas flowing into the NOx catalyst 21 and concentrations of two types of poisoning substances included in the exhaust gas out of poisoning substances that are substances causing poisoning through adsorption to the NOx catalyst 21, the poisoning amount estimation section 41 estimates poisoning amount that is the amount of poisoning substances poisoning the NOx catalyst 21.SELECTED DRAWING: Figure 1 【課題】ＮＯｘ触媒への被毒物質の被毒量を高精度に推定可能な排気浄化システムを提供する。【解決手段】エンジン１０からの排気を浄化する排気浄化システム１であって、ＮＯｘ触媒２１と炭化水素供給部３１と被毒量推定部４１とを備えている。ＮＯｘ触媒２１は、エンジン１０の排気通路１２に設けられる。炭化水素供給部３１は、ＮＯｘ触媒２１に炭化水素を供給する。被毒量推定部４１は、ＮＯｘ触媒２１に流入する排気の温度および流量、ならびに、ＮＯｘ触媒２１に吸着することにより被毒を生じさせる物質である被毒物質のうち排気に含まれる２種類の被毒物質の濃度に基づき、ＮＯｘ触媒２１に被毒した被毒物質の量である被毒量を推定する。【選択図】図１