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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/>
LPG 액상 분사 시 인젝터 주위의 Icing 현상에 관한 연구(II)
박정철(Jungcheol Park),김우석(Wooseok Kim),박심수(Simsoo Park),박영무(Youngmoo Park),유재석(Jaisuk Yoo),이종화(Jonghwa Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Recently, LPLi(Liquied-Phase LPG injection) system is studied for the new stringent emission regulations. But,<br/> there are some problems to be solved such as injector tip icing and fuel leakage for LPLi system development.<br/> Icing is closely related to the temperature of the intake port wall surrounding the injector and the variation of the<br/> LPG fuel pressure. Also, the shape of the injector tip, injector installed position and the number of injector holes are<br/> factors for icing. In this study, the icing characteristic of the LPLi injection system was investigated with<br/> visualization test rig, which was installed thermocouples, fuel compressor equipments, and injector controller.<br/> The icing of the injector tip can be affected by the materials related to heat transfer. The variation of temperature<br/> surrounding injector tip was observed with injector position, fuel pressure, and the number of injector holes.
성봉진(Bongjin Seong),박정철(Jungcheol Park),박준성(Junseong Park) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
The vehicle has a number of ECUs, each ECU has a CAN, and various actuators for vehicle control are controlled by voltage and current. This paper introduces the system of automated test for developing drivability, that the status of vehicle can be obtained using CAN and the vehicle can be controlled directly by using analog output equipment automatically. This system helps save time and cost for developing drivability. In addition, it has also benefits of high reliability and repeatability of test result, which were proved by demonstration test.
LPG 액상 분사 시 인젝터 주위의 Icing 현상에 관한 연구 (Ⅰ)
김우석(Wooseok Kim),박정철(Jungcheol Park),이종화(Jonghwa Lee),유재석(Jaisuk Yoo),박심수(Simsoo Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Recently, LPli(Liquefied Petroleum liquid injection) system is studied for the new stringent emission regulations. Different from the mixer system for LPG, there are some problems to be solved such as injector tip icing and leakage for LPli system development.<br/> In this study, icing problem near injector tip, this leads to difficulty of accurate A/F control, was studied and reported. Icing of injector tip & port waII was observed at all the cases in this study regardless of injection duration and angle, air humidity change. The spray angle of LPli was observed approximately two times wider than that of Gasoline injection. This makes the LPli spray collide with intake port around injector tip. Temperature of the wetted area was decreascd and icing of water vapor contained in intake air because of evaporation of the fuel film. The ice of the injector tip and port wall is also affected by the materials related to heat transfer.