HC-LNT의 NOx 변환 효율 향상을 위한 2차분사계의 위치 및 분사 조건에 관한 연구

Abstract

Automotive engines require strategies to fulfill the emission regulations in terms of NOx and PM. Hydrocarbon-Lean NOx Trap (HC-LNT) catalyst, is using diesel fuel itself as a reducing agent, is considered as more utilitarian technology in order to respond against emission regulations. When NOx is emitted, if there is a satisfactory supply of reducing agent, the emitted NOx will convert to N. However, if the concentration of reducing agent is unsatisfactory, the emitted NOx will not decrease to N. Too much amounts of reducing agent will slip through the LNT without the benefits of conversion and cause additional emission problems. Thus, the efficient amount of reducing agent should be supplied into the catalytic converter. In this study, engine emission test have been investigated to optimize injection quantity at each engine test condition. Different exhaust layouts and catalysts have been studied and extension unit which makes better uniformity of exhaust gas was used for HC-LNT system.