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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%.
배기가스재순환 적용에 따른 Off-road 엔진의 연료 분사 시기 전략에 관한 연구
하형수(Hyeongsoo Ha),신재식(Jaesik Shin),표수강(Sukang Pyo),정학섭(Haksup Jung),강정호(Jungho Kang) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.4
The reduction technologies of exhaust gas from both the off-road engine and on-road vehicles are important. It is possible to apply various combustion technologies with engines after the application of a treatment technology to this field. In this study, main injection timing, pilot injection timing, and exhaust gas recirculation (EGR) rate were selected as the experimental parameters whose effects on the emission of exhaust gases and on the fuel consumption characteristics were to be determined. In the experiment, the emission of nitrogen oxide (NOx) and Smoke, and the Torque at the same fuel consumption level, were measured. The experimental data were analyzed using the Taguchi method with an L9 orthogonal array. Additionally, analysis of variation (ANOVA) was used to confirm the influence of each parameter. Consequently, the level of each parameter was selected based on the signal-to-noise ratio data (main injection timing, 3; pilot injection timing, 3; EGR rate, 2), and the results of the Taguchi prediction were verified experimentally (error: NOx, 10.3 %; Smoke, 6.6 %; brake-specific fuel consumption (BSFC), 0.6 %).
다구찌 방법을 적용한 Off-road 디젤 엔진의 분사조건 및 EGR 율 최적화에 관한 연구
하형수(Hyeongsoo Ha),안중규(Juengkyu Ahn),박찬수(Chansu Park),강정호(Jeongho Kang) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.7
Not only the emission regulation of on-road vehicle engine, but also emission regulation of off-road engine have been reinforced. It is the reason of wide application of emission reduction technology for off-road engines. In this study, optimization of engine parameters (Injector hole number, Injection timing and EGR rate) for reduction of NOx and smoke emissions were conducted by using the analysis of sensitivity and S/N ratio of Taguchi method(DOE). As results, this paper shows optimum value of the parameters for NOx and smoke emission reduction. From the result of reproducibility verification, it is final that the prediction value of NOx and smoke has the error of below 10%. Consequently, the method and results of this study will be used for quantitative reference to EGR control mapping in next study.
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
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.