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LPLi 엔진 인젝터에서의 Icing 가시화 및 이의 유입이 연소와 배기가스에 미치는 영향
박정철(Jungcheil Park),김우석(Wooseok Kim),이종화(Jonghwa Lee),이병옥(Byungohk Rhee),박경석(Koungseok Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Ever since air pollution issues have risen globally, each automobile manufacturer has been undergoing vigorous development for low emission vehicles. One of these researches is the use of clean fuel to reduce emission. And the development of the LPLi system is one of them. Compared to the conventional mixer system, the LPLi system can fine control the air fuel ratio, and thus resulting in outstanding emission reduction and power. But there are a few problems in the development. One of them is the Icing that occurs at the tip of the injector.<br/> If an Icing particle enters the combustion chamber, it effects the combustion and has the following problems; When the Icing particles enter the cylinder, the visualization has been performed the intake manifold and the injector tip. And the analysis of the exhaust gas shows that HC, CO, and O₂ increases while CO₂ and NOχ decreases after the Icing particle flows in the cylinder. These results are similar to when the combustion is unstable, and a rich value of the air-fuel ratio also proves incomplete combustion.<br/>
LPLi 엔진 인젝터 주위의 Icing 방지를 위한 설계 변수의 실험적 연구
박정철(Jungcheol Park),김우석(Wooseok Kim),이종화(Jonghwa Lee),이병옥(Byungohk Rhee),박심수(Simsoo Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Compared to the conventional mixer system, the LPLi system can fine control the air fuel ratio, and thus resulting in outstanding emission reduction and power. But there are a few problems in the development. One of them is the Icing that occurs at the tip of the injector.<br/> If an Icing particle enters the combustion chamber, it effects the combustion and has the following problems; When the Icing particles enter the cylinder, the visualization has been performed the intake manifold and the injector tip. And the analysis of the exhaust gas shows that HC, CO, and O₂ increases while CO₂ and NOχ decreases after the<br/> Icing particle flows in the cylinder. These results are similar to when the combustion is unstable, and a rich value of the air-fuel ratio also proves incomplete combustion.<br/> An aim of this study removes the Icing from the injector tip. First, design parameter for removing the Icing, the O-ring Retainer changes plastic material to metallic material. Second, regarding to spray angle, injector insert depth is 7~10mm. Third, the injector insert hole diameter is about 10mm. It makes heat transfer between the injector tip and the intake manifold. Last, it is minimize depth of insulator.<br/>
과도운전 구간에서의 연비인자 거동 및 이를 고려한 모드연비 시뮬레이션
이동규(Dongkyu Lee),김대광(Daekwang Kim),이병옥(Byoungohk Rhee),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The fuel energy injected into a vehicle is dissipated at subsystems of the vehicle including engine, transmission, drive-train, etc. In this study, a new methodology analyzing contributiveness of vehicle subsystem on fuel economy is proposed. Finding optimal combination of subsystems is as much important as improving efficiency of each subsystem for vehicle fuel economy. In order to achieve it, the simulation of vehicle fuel economy is performed using commercial software. Most of the subsystems are modeled for this simulation and vehicle tests are carried out to get model coefficient. The result of simulation on fuel economy is compared to that of vehicle test. Especially, the result of a simulation considered transient states shows under 1% of error comparing with a test on a chassis-dynamometer.
엔진 웜업시 오일온도에 따른 엔진 마찰이 차량 모드 연비에 미치는 영향
김병수(Byeongsu Kim),임건병(Gunbyoung Lim),이병옥(Byoungohk Rhee),박진일(Jinill Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently Simulation resulted in developing computer is attempting to experiment vehicle driving not using expensive instruments. It is possible to presuppose fuel economy by changing the characteristic of accessories using CRUISE(vehicle simulation software). In this paper, fuel consumption at each part of the vehicle is analyzed from experiment. The results of fuel economy analysis on experiment substitute for Cruise to measure fuel economy. The achieved simulation data such as engine speed, brake torque, shift pattern, vehicle speed, fuel consumption level is almost equal to experiment data. In this paper, it is performed that warm-up time of engine oil temperature is faster or slower through simulation. The faster engine oil warm-up time is, the more engine friction is decreased. As a result of decreasing of engine friction, fuel economy is improved maximum up to 1.7%.