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Off-road 차량용 디젤엔진의 NOx 저감을 위한 EGR 시스템 적용에 관한 연구
강정호(Jeongho Kang),남대우(Daewoo-Nam),정건우(Gunwoo Jeong),조규백(Kyubak Cho),장용수(Youngsoo Jang),김문형(Munhyung Kim),박상호(Sangho Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In order to decrease NOx emission, the EGR system was applied on the off-road vehicle diesel engine. First of all, the primary map of EGR rate was formed by testing EGR in various engine driving conditions, and the engine performance and the NOx reduction was investigated. As the results of experiments, in the case of applying HPL EGR system on diesel engine used WGT, it is shown that the operating region of EGR is effective in low or middle load due to changing the differential pressure between turbocharger inlet and intake manifold. Increased EGR rate, NOx emission decrease according to increasing EGR rate, but THC shows the increasing tendency because of the increased fuel mass to compensate for the deteriorated power by EGR. Also, the temperature in intake and EGR system is raised highly by increasing the recirculated exhaust gas. From above results, the operating region of EGR is limited. However, NOx emission entirely decrease about 20~40% by applying EGR. So, if using the appropiate EGR rate for various engine driving condition, it is expected that NOx reduction is improved more and more.