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디젤 차량의 각 요소별 연료소모량 분석을 위한 실험적 연구
김재일(Jaeil Kim),장창현(Changhyun Jang),이종화(Jonghwa Lee),유재석(Jaisuk Yoo),이병옥(Byungok Lee),박경석(Kyungseok Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Systematic analysis of vehicle fuel consumption is necessary for the further improvement of vehicle fuel economy. In this study, a methodology for the break-down of vehicle fuel consumption equipped with a common rail DI diesel engine was studied and experimental study was carried out.<br/> Based on the experiment, the result shows that fuel energy is used in exhaust enthalpy flow(22.3%), heat rejection to coolant(30.7%), vehicle inertia(13.7%), engine friction(13.3%), pumping loss(-1.2%), electric power generation(O.3%), engine inertia(O.2%), torque converter loss(2.9%), drivetrain friction(O.6%), drivetrain inertia(O.03%), road-load( 12.1%).<br/>
[가솔린엔진부문] 흡기포트 분사식 LPG 엔진의 연료량 제어 및 연소 특성에 관한 연구
김우석(Wooseok Kim),이종화(Jonghwa Lee),장창현(changhyun Jang) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper. characteristics of a port injection type LPG fuel system were investigated to adopt the system 10 a spark ignition engine through rig test. It was also studied that engine combustion characteristics for limited conditions and the precise control method of LPG fuel supply. As a basic experiment, the effects and the relationships of parameters such as orifice area, fuel delivery pressure, fuel temperature and flow coefficient were established. From this, one dimensional compressible flow equation can be applied to control gaseous fuel flow rate by setting pressure difference between vaporizer and manifold to a certain range, for example about 1.2 bar in a naturally aspirated engine. The combustion analysis results of LPG engine were also compared with those of gasoline engine according to spark timing and load change. At part load and stoichiometric condition, the MBT spark timing of LPG fueled engine is retarded by 2' - 4'. CA compared to that of gasoline engine. On the contrary, the spark timing of LPG fueled engine can be advanced by 5' - 10' CA at WOT, which results from higher Octane Number of LPG fuel compared 10 gasoline.