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김우석(Wooseok Kim),나천희(Chenhee Na),손유상(Yousang Son) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
This paper investigate the feasibility of developing commercial vehicle for a best fuel economy using a advanced aerodynamic design, an engine down-sizing technology and a vehicle total thermal management etc.; a aerodynamic design achieved by real wind tunnel, an engine down-sizing technology with the engine equipped with 2-stage turbo charger, WCAC(Water-cooled Charged Air Cooler) and 2-stage EGR(exhaust gas recirculation) cooler. It was possible to get over the power limit of the engine with VGT(variable geometry turbo charger) and EGR from 420PS to 460PS, using 2-stage turbo charger, WCAC and 2-stage EGR cooler. 9.1% improvement of a vehicle fuel economy could be accomplished using Aerodynamic design, Down-sizing of engine and Total thermal management. In the case of the variable engine oil pump and the Single Tire, it could be possible additionally to improve a vehicle fuel economy of 2.0%.
김우석(Wooseok Kim),서정민(Jungmin Seo),손유상(Yousang Son) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Waste heat recovery (WHR) has been recognized as a promising technology to achieve the fuel economy and greenhouse gas reduction goals for future heavy-duty (HD) truck diesel engines. A Rankine cycle system with ethanol as the working fluid was developed with HMC & VOITH, to investigate the fuel economy benefit from recovering waste heat from a 12.7L HD truck diesel engine. Thermodynamic analysis on this WHR system demonstrated that 6.5% fuel saving could be achievable. Finally, test bench measurements of the applied engine coupled with a heat recovery device are carried out. It can be demonstrated that waste heat recovery can produce an additional power output of about 3.2~4.5% at partial load and 1.2 ~ 2.8% at full load condition. Also as a result of vehicle testing, fuel economy can be achieved to increase 3.3% at chassisdynamometer mode test.
연속 가변 밸브 듀레이션 기구 동특성 분석 및 피로수명 예측
이주환(Juhwan Lee),박동헌(Donghun Park),이승재(Seungjae Lee),손유상(Yousang Son),하경표(Kyoungpyo Ha),정준욱(Junwook Jeong),김성준(Seoungjoon Kim) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
A Continuously Variable Valve Duration (CVVD) engine has been developed. The CVVD mechanism can change valve duration of an engine relatively shorter and longer than the conventional ones. Thus, it can improve fuel efficiency of a gasoline engine by reducing compression work at part load condition, and can also improve low end torque by increasing volumetric efficiency at wide open throttle condition. But, the CVVD consist of many parts by contacting between parts. So, it is possible to have a problem about durability, wear. This study deals with wear of worm wheel & fatigue life of bracket & dynamic characteristic of valve-train. And a multi-body model has been developed in order to achieve detailed knowledge on dynamic loads. Also this study proposed a new design for improvement about wear, durability, dynamic characteristic.