http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Study to Optimize a Commerical Vehicle Fuel Consumption Using Vehicle Simulation
Myungseok Lyu,Steven Whelan,Ben Rogers 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
An approach to optimizing vehicle fuel economy is described based on a study of a commercial vehicle. The approach is based on using a V-SIM software vehicle simulation to identify the relative efficiency of each of the vehicle systems, such as the engine hardware, engine software calibration, transmission, cooling system and ancillary drives. The simulation based approach offers a detailed understanding of what vehicle systems are underperforming and by how much the vehicle fuel economy can be improved if those systems are brought up to best-in-class performance. In this way, the optimum vehicle fuel economy can be provided to the vehicle customer. A further benefit is that the simulation requires only a minimum of vehicle testing for initial validation, with all subsequent field test cycles performed in software, thereby reducing development time and cost for the manufacturer.
소형 HSDI 디젤엔진에서의 Common Rail을 이용한 분사압력 변화가 Smoke 및 연료소모량에 미치는 영향
류명석(Myungseok Lyu),신범식(Bumsik Shin) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.2
Great attentions are paid to HSDI diesel engine for passenger cars because of its high thermal efficiency. The most interesting research in HSDl diesel engine developments is focused on applying common rail system as a fuel injection equipment. In this study, a series of tests are carried out to investigate the effect of injection pressure variations on the smoke and fuel consumption in a small HSDI diesel engine with common rail system. As a result of this study it is concluded that there is an optimum rail pressure dependent on combustion system such as nozzle type, combustion chamber geometry.
류명석(Myungseok Lyu) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.5
A study to get better vehicle fuel economy is described based on an express bus. The approach is based on using a commercial software vehicle simulation to identify the relative efficiency of each of the vehicle systems, such as the engine hardware, engine software calibration, transmission, cooling system and ancillary drives. The simulationbased approach offers a detailed understanding of which vehicle systems are underperforming and by how much the vehicle fuel economy can be improved if those systems are brought up to best-in-class performance. In this way, the optimum vehicle fuel economy can be provided to the vehicle customer. A further benefit is that the simulation requires only a minimum of vehicle testing for initial validation, with all subsequent field test cycles performed in software, thereby reducing development time and cost for the manufacturer.
류명석(Myungseok Lyu) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.2
The performance of reciprocating internal combustion engine is a strong function of the air intake system configuration. [n order to improve engine power, it is essential to optimize the air induction system. In this study, a numerical investigation has been carried out for the three-dimensional flow and pressure characteristics in air intake system of a large-sized commercial bus. CFD simulations using STAR-CD were also performed to evaluate effects of intake duct geometry and structure variation inside air cleaner on the negative pressure distribution of overall intake system. Studies for improving the back pressure distribution have been proposed and quantitatively examined based on intensive case studies.
류명석(Myungseok Lyu) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.2
This study was initiated to evaluate the cooling performance of CAC (charged air cooler) and radiator in the engine room of a mini bus. So we had firstly to predict the mass flow rate coming from radiator grille and front bumper opening using computational fluid dynamics (CFD) simulation based on 3D configuration. And simulations were carried out for different cooling module layout and bumper opening hole size on same vehicle operating condition. Simulation results show that CAC cooling performance at reverse protecting plate-applying model was much efficient than that of the bumper opening hole size-increasing model in IMTD point of view. Part of the CFD simulation results was compared to with experimental data. It was confirmed that the CFD approach using STAR-CD based on pursuing no-compromise solution could provide design engineers with useful design information in the early design stage of vehicle development.
노즐특성이 Small HSDI 디젤엔진의 성능에 미치는 영향
류명석(Myungseok Lyu) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.4
vco nozzle is devised to minimize the HC emission and has been applied on some HSDl diesel engines. But it is not well reported whether VCO nozzle would be advantageous over SAC nozzle in a small HSDI diesel engine. In this paper it is presented that characteristics of VCO and SAC nozzle under common rail fuel injection system and their effects on the performance in a small HSDI diesel engine.
류명석(Myungseok Lyu),두병만(Byungmann Doo),구영곤(Younggon Ku) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.5
This paper describes on studies of the heavy duty engine calibration for better fuel economy based on real driving conditions. Using testbed validated software simulation of the engine and turbocharger system, an alternative turbocharger specification, with potential to improve fuel economy was identified. Secondly, the engine calibration was modified to optimize vehicle fuel economy over a typical customer drive cycle whilst still meeting the steady-state (testbed) emissions legislation. These results were confirmed by field testing of a vehicle equipped with the updated specifications. This study found good agreements between the prediction and the field test on the vehicle fuel economy improvements of the express bus with updated calibration and turbocharger.
류명석(Myungseok Lyu),신재영(Jaeyong Shin),진봉용(Bongyong Jin) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study was initiated to evaluate the cooling performance of CAC (charged air cooler) and radiator in the engine room of a mini bus. So we had firstly to predict the mass flow rate coming from radiator grille and front bumper opening using computational fluid dynamics (CFD) simulation based on 3D configuration. And simulations were carried out for different cooling module layout and bumper opening hole size on same vehicle operating condition. Simulation results show that CAC cooling performance at reverse protecting plate-applying model was much efficient than that of the bumper opening hole size-increasing model in IMTD point of view. Part of the CFD simulation results was compared to with experimental data It was confirmed that the CFD approach using STAR-CD based on pursuing no-compromise solution could provide design engineers with useful design information in the early design stage of vehicle development<br/>
류명석(Myungseok Lyu),두병만(Byungmann Doo),구영곤(Younggon Ku) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.19 No.6
Recently, studies conducted by our research group, revealed the possibility for reducing BSFC, NOx and PM emissions to meet the Euro 4 & 5 legislations. The main objective of the present study is to get better fuel economy in commercial vehicles by considering real driving conditions. Firstly, in order to improve fuel economy on fields, specifically it is required to analyze the driving pattern and make the representative modes from real field data. Secondly, it is performed to make the engine dynometer test to optimize the fuel consumption by reflecting on the representative driving modes, based on the Korea 2008 emission legislation equal to the Euro 4. The engine components such as engine calibration, combustion chamber, turbocharger and ancilliaries were modified to optimize vehicle fuel economy over a typical customer drive cycle whilst still meeting the exhaust emission restrictions. Finally, these results were confirmed by field testing of vehicle equipped with the updated calibration engine. It was placed the two vehicles together traveling the same route and accomplishing the same amount of stops(back to back), in order to evaluate the fuel consumption in comparison to the current vehicle. Through several repeats such as the engine calibration and field test, we could get 3 % to 7.7 % vehicle fuel economy improvements compared to previous vehicle.
[디젤엔진부문] Common Rail을 이용한 분사압력변화가 소형 HSDI 디젤엔진의 Smoke 및 연료소모량에 미치는 영향
신범식(Buomsik Shin),류명석(Myungseok Lyu),최규훈(Kyuhoon Choi) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Great attentions are paid to HSDI diesel engine for passenger car because of its high thermal efficiency. Most development research in HSDI diesel engine is focused on applying common rail system as a fuel injection equipment. In this study, a series of tests are carried out to investigate the effect of injection pressure variations by common rail on the smoke and fuel consumption in a small HSDI diesel engine. As a result of this study it is concluded that there is an optimum rail pressure dependent on combustion system such as nozzle type, combustion chamber geometry.