http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.