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Off-road용 디젤엔진에서의 VGT 및 EGR 적용에 따른 엔진 배기 및 연비 특성 평가
하형수(Hyeongsoo Ha),신재식(Jaesik Shin),정학섭(Haksup Jung),표수강(Sukang Pyo),강정호(Jungho Kang) 한국연소학회 2016 한국연소학회지 Vol.21 No.2
To meet the Tier-4 emission standard, a variety of combustion technology in the field of off-road engine has been applied in conjunction with the engine after treatment technology. In this study, as the basis study for applying VGT and HPL EGR to 3.6 L CRDi engine, exhaust gas characteristics and fuel economy characteristics are confirmed in accordance with VGT and EGR operating conditions. Consequently, in the EGR applicable conditions, 60% VGT vane duty condition was confirmed that the trade-off characteristics between NOx and smoke are advantageous. In addition, in view of BSFC, VGT vane duty is considered desirable to control at around 50%.
진공펌프와 가변형 오일펌프 모듈화에 따른 디젤엔진의 연비향상에 관한 실험적 연구
김현준(Hyunjun Kim),하형수(Hyeongsoo Ha),강정호(Jeongho Kang),이호길(Hokil Lee),오세두(Sedoo Oh),오태성(Teasung Oh) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Various studies have been made for the modern energy-saving cars. The purpose of this paper is to determine the fuel economy through the application engine with Duo-pump(combined vaccum pump, oil pump). Target engine is 2.5L common-rail engine. Test condition is engine rpm 1500, 2000rpm at load is 20%, 40%, 60%(max torque). Duo-pump is composed of vaccum pump and oil pump. It was controlled by the current control oil pressure. The vaccum pump increase speed because drive shaft was changed. As a result, test condition average fuel economy has improved by 1.9%. This means that fuel economy improve through FMEP and oil pressure reduction.
Off-road 엔진의 분사시기 전략과 EGR 적용에 따른 배출가스 특성에 관한 연구
권석주 ( Seokjoo Kwon ),하형수 ( Hyeongsoo Ha ),강정호 ( Jungho Kang ),서영호 ( Youngho Seo ),박성욱 ( Sungwook Park ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
Off-road engine used in not only transportation, but also construction, agricultural, industrial equipment. In this study, main/pilot injection timing and EGR ratio are changed by three conditions to analysis the effects of off-road engine`s emission characteristics. As the main and pilot injection timing is advanced, soot emission is reduced. The more increased the EGR ratio, more NOx emission was dominantly reduced but CO, CO2, Soot emission is increased and engine power is decreased