| 제목 |
Urea-SCR 시스템의 Map 기반 Open Loop 제어알고리즘 개발 |
| 분야 |
엔진 및 연소 |
| 언어 |
Korean |
| 저자 |
함윤영(우석대학교), 박용성(자동차성능연구소) |
| Key Words |
ETC(European Transient Cycle, 유럽 과도상태 시험모드), NOx(질소산화물), Urea(요소), NH3 slip (암모니아 슬립), SCR(Selective Catalyst Reduction, 선택적 촉매환원), NH3 storage capacity(암모니아 저장용량) |
| 초록 |
To meet the NOx limit without a penalty of fuel consumption, Urea-SCR system is currently regarded as promising NOx reduction technology for diesel engines. SCR system has to achieve maximal NOx conversion in combination with minimal NH3 slip. In this study, map based open loop control for urea injection was developed and assessed in the European Transient Cycle (ETC) for heavy duty diesel engine. The basic urea quantity set-value which was calculated using the look up tables of engine out NOx, exhaust flow rate and optimum NSR resulted in NOx reduction of 80% and the average NH3 slip of 24 ppm and maximum of 79 ppm. In order to reduce NH3 slip, NH3 storage control algorithm was applied to correct the basic urea quantity and reduced NH3 slip levels to the average 15 ppm and maximum 49 ppm while keeping NOx reduction of 76%. With high and increasing SCR temperature, the NH3 storage capacity decreases, which leads to NH3 slip. The resulting NH3 slip peak can be avoided by stopping or significantly reducing the urea injection during the SCR temperature gradient is over 30°C/min. |
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