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LPG 직접분사 엔진의 냉시동시 분사압력 저압화 가능성에 대한 연구
장원욱(Wonwook Jang),송진오(Jinoh Song),육철수(Chulsoo Yook),명차리(Cha-Lee Myung),박심수(Simsoo Park) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The most advanced type of commercialized engine fueled with LPG is now Liquefied Phase LPG Injection (LPLI). The LPDI technology, which brought the concepts of direct injection from state-of-the-art GDI engines, has advantages in terms of power output, fuel economy compared with LPLI, and emits less pollutants than GDI. The direct injection (DI) technology requires high pressure fuel injection for improvements in air-fuel mixture preparation and combustion performance, which leads to increase in manufacturing cost and possibility of fuel leakage. The former studies has revealed that high fuel injection pressure is not needed in LPDI engine with full-load condition because the LPG fuel has superior vaporization characteristic. In this study, the low temperature startability performance of a 2.4L, 4-cylinder DI engine fueled with LPG was evaluated with various fuel injection pressure. The vaporization and mixture preparation characteristic of fuel and air are especially significant in low temperature condition. The startabilities were evaluated by delay time from the start of cranking to first combustion, and the total hydrocarbon (THC) concentrations were measured.
고속가스분석기를 이용한 LPG 직접분사 엔진의 냉각수온에 따른 실린더 내 혼합기 거동에 관한 실험적 연구
장원욱(Wonwook Jang),고아현(Ahyun Ko),송진오(Song Jinoh),서봉교(Seo Bongkyo),육철수(Yook Chulsoo),김성근(Kim Sungkun),박심수(Simsoo Park) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Gasoline Direct Injection (GDI) engine, is estimated as an alternative of former port fuel injection (PFI) type engine due to its advantage on performance and emission characteristics. However, GDI vehicles seems to be facing trouble on future particle number regulations. Recent studies have shown direct injection engines fueled with Liquefied Petroleum Gas (LPG), known as one of the clean energy sources, have definite advantage on emission and equivalent level of performance compared to gasoline engines. This study investigates the behaviors of combustion phenomena and hydro-carbon in cylinder of direct injection engine fueled with LPG (LPDI). At cold state (coolant temperature 25 ℃), HC concentration behavior in cylinder varies depends on excess air ratio, ignition timing and injection timing. On the other hand, it is revealed that tested parameters have little effects on HC concentration at hot state (coolant temperature 80 ℃).
과급 1.6L LPG 직접분사식(LPDI) 엔진의 입자상물질 배출 특성과 분사시기 변화에 따른 배출가스 특성 및 엔진 거동에 관한 연구
진동영(Dong Young Jin),장원욱(Wonwook Jang),최관희(Kwanhee Choi),고아현(Ahyun Ko),박심수(Simsoo Park),송진오(Song Jinoh),육철수(Yook Chulsoo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This study investigates characteristic of THC and NOx emission and engine behavior with the change of injection timing in turbo-charged direct injection engine fueled with LPG (T-LPDI). THC emission varies depends on engine speed and load, however injection timing has no effect to THC emission. LPG has fine characterisric of atomization, so combustion efficiency is increased. Injection timing has effect to NOx emission as premixed rate and intake air mass is changed. As a result bTDC 310˚CA is compromised injection timing. Particulate number varies depends on engine speed and load because of combustion period and intensity of air flow.