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LPG 직분사 엔진의 다운사이징 효과 및 시동성 개선을 위한 연료 제어시스템 최적화에 관한 연구
임종석(Jongsuk Lim),김도완(Dowan Kim),박한용(Hanyong Park),송진오(Jinoh Song),한정환(Junghwan Han),육철수(Chulsoo Yook),박성민(Seongmin Park),신용남(Yongnam Shin) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.6
The new 1.4 L turbocharged LPG direct injection (T-LPDI) engine is presented in this paper to improve the fuel efficiency of the vehicles installed with the 2.0 L LPG port fuel injection (LPI) engine, while maintaining the performance as a downsizing concept for the new engine platform development. Firstly, the return type high pressure LPG fuel supply system is designed and mounted in the new 1.4 L T-LPDI engine. As a result, this new engine shows a much better WOT performance and approximately 8 % of improved fuel economy level, as compared to the 2.0 L LPI vehicle. Secondly, the LPDI engine specific optimized design for high pressure fuel components and fuel injection control strategies are proposed and evaluated in order to overcome the restartability problem in a heat-soaked condition called the vapor lock phenomenon. Consequently, these experimental results illustrate a great potential for the developed 1.4 L T-LPDI engine as a possible substitute for the 2.0 L LPI engine.
디젤엔진의 실시간 연소제어를 위한 연소위상검출 알고리즘개발
오승석(Seungsuk Oh),임종석(Jongsuk Lim),정재성(Jaesung Chung),이강윤(Kangyoon Lee),선우명호(Myoungho Sunwoo),한경찬(Kyungchan Han),유준(Jun Yu),박승일(Seungil Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In diesel engines, even if fuel is injected at identical time, combustion phase varies depending on operating conditions such as temperature, humidity, and fuel properties. Such deviations of combustion phase are directly related harmful emissions and torque performance, therefore the combustion phase needs to be detected and controlled. In this study, we propose a novel combustion detection algorithm, Difference pressure Heat release using dP term (DHdP) to detect combustion phase in real-time. DHdP is derived from the difference pressure between firing pressure and motoring pressure and detects combustion phase. DHdP shows a strong linear relationship with 50% mass fraction burned (MFB50), which is well-known for a combustion phasing indicator, under different operating conditions. Furthermore, DHdP requires fewer cylinder pressure data and lighter calculation load, so that it is suitable for real-time applications.
저 기화성 연료를 사용한 직접분사식 과급 가솔린엔진에서 전 부하 스모크 저감을 위한 시스템 최적화에 관한 연구
김도완(Dowan Kim),이승환(Sunghwan Lee),임종석(Jongsuk Lim),이성욱(Seangwock Lee) 한국자동차공학회 2015 한국 자동차공학회논문집 Vol.23 No.1
This study is a part of the high pressure injection system development on the Turbo GDI engine in order to reduce smoke emission in case of using the low volatile(high DI) fuel which is used as normal gasoline fuel in the US market. Firstly, theoretical approach was done regarding gasoline fuel property, performance, definition of particle matters and its creation as well as problems of the high DI fuel. In this experimental study, 2L Turbo GDI engine was selected and optimized system parameter was inspected by changing fuel, fuel injection mode (single/multiple), fuel pressure, distance between injector tip and combustion chamber, start of injection, intake valve timing in engine dyno at all engine speed range with full load. In case of normal gasoline fuel, opacity was contained within 2% in all conditions. On the other hands, in case of low volatile fuel (high DI fuel), it was confirmed that the opacity was rapidly increased above 5,000 rpm at 14.5 ~ 20 MPa of fuel pressure and there were almost no differences on the opacity(smoke) between 17 MPa and 20 MPa fuel pressure. According to the SOI retard, smoke decrease tendency was observed but intake valve close timing change has almost no impact on the smoke level in this area. Consequently, smoke decrease was observed and 16% at 6000rpm respectively with injector washer ring installed. By removing injector washer to make injector tip closer to the combustion chamber, smoke decrease was observed by 46% at 5,500 rpm, 42% at 6,000 rpm. It is assumed that the fuel injection interaction with cylinder head, piston head, intake and exhaust valve is reduced so that impingement is reduced in local area.
실험계획법에 의한 가솔린 GDI+MPI 엔진의 연비 및 성능향상 관점에서의 운전영역별 연료분사 전략에 관한 연구
김도완(Dowan Kim),이승환(Sunghwan Lee),임종석(Jongsuk Lim) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.3
The gasoline direct injection (GDI) system is considerably spreading in automotive market due to its advantages. Nevertheless, since GDI system emit higher particle matter (PM) due to its combustion characteristics, it is difficult to meet strengthened emission regulation in near future. For this reason, a combined GDI with MPI system, so-called, dual injection (DUI) system is being investigated as a supplemental measure for the GDI system. This paper focused on power and fuel consumption effect by injection mode strategy of DUI system in part load and idle engine operating condition. In this study, port fuel injectors are installed on 2.4 liters GDI production engine in order to realize DUI system. And, at each injection mode, DOE (design of experiment) method is used to optimize engine control parameters such as dual injection ratio, start of injection timing, end of injection timing, CAM position and so on. As a consequence, DUI mode shows slightly better or equivalent fuel efficiency compared to conventional GDI engine on 9 points fuel economy mode as well as MPI mode shows less fuel consumption than GDI mode during idle operation. Furthermore, DUI system shows improvement potential of maximum 2.0% fuel consumption and 1.1% performance compared to GDI system in WOT operating condition.
직접분사식 가솔린엔진에서 Cooled HP-EGR 시스템 적용에 따른 북미 시험모드 별 차량 연비개선 포텐셜에 관한 연구
김도완(Dowan Kim),김승범(Seungbum Kim),이승환(Sunghwan Lee),임종석(Jongsuk Lim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper focuses on the vehicle test result of the US fuel economy test cycles such as FTP75, HWY and US06 with Cooled HP-EGR system on gasoline direct injection(GDI) engine. In general, with EGR system, the mixing exhaust gas with clean air reduces the oxygen concentration in the cylinder charge and increase the heat capacity of the charge mixture. As a result, the combustion temperature drops which is known to improve knocking limit and fuel economy. In this study, 2.4 liters GDI production vehicle was reworked with electrical controlled EGR valve and high efficiency EGR cooler used in diesel serial production. The control algorithm of Cooled HP-EGR system was realized by model based development using SDA-iRPT(internal rapid prototyping) tool from Continental Automotive System. In experiment result, we confirmed that the spark timing was more advanced without knocking and manifold pressure was increased in all cases with EGR system. Furthermore, a positive potential of fuel economy improvement on FTP mode, US06 mode have been shown with EGR system but not for HWY mode where the engine load is quite low and the spark advance is already optimized. Consequently, the fuel economy was increased by maximum 3.3% on FTP mode, 2.7% on US06 mode and decreased by 0.3% on HWY mode respectively with EGR system.