http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 채성수(Sungsoo Chae) (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
선종호(Jongho Seon),원종승(Jongseung Won),채성수(Sungsoo Chae),문종윤(Jongyon Moon),김진용(Jinyong Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, the environmental problems by the global warming have become more serious and fuel economy regulations of all over the country have been tightened. For these reason, the vehicle consumer’s concern about “environmental?friendly” and “higher fuel economy” have been higher every day. According this trend, new technologies for the higher fuel economy are developed actively by car makers of the world. This paper presents the technology for improving the fuel consumption by the wasted exhaust heat recovery system. Exhaust heat recovery system supply the heat energy of exhaust gas to engine coolant and auto transmission oil at low temperature right after engine starting. It reduces engine and auto transmission warm-up time, and reduces the power-train friction loss, therefore, it is possible that fuel consumption is improved. In this paper, the optimization of heat exchange efficiency for higher fuel economy is studied. And also, exhaust tail pipe noise & pressure drop is optimized for the total exhaust system performance.
-
안호찬(Hochan An),원종승(Jongseung Won),채성수(Sungsoo Chae),강종화(Jonghwa Kang),김현수(Hyunsoo Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently, many technologies are being developed for better fuel economy. Especially, car producers try to cut fuel consumption in city driving. It is possible to reduce automatic transmission(AT) gear shifting which worsens fuel economy if the engine gets higher low/mid range torque. So there is a growing tendency to apply dual continuous variable valve timing(CVVT) direct injection spark ignition(DISI) engine for this. Since exhaust and intake valve are under control of dual CVVT, its possible to improve low/mid range torque by utilizing overlap period. And DISI engine can minimize the problem with fuel oxidation in catalytic converter occurred as extending overlap period in the multipoint injection(MPI) engine because it directly sprays with fuel in the cylinder and controls a spraying- time point. But exhaust gas interference produced by explosion of the fuel in cylinders should be minimized to utilize overlap period. The more the distance between exhaust valve and exhaust junction is extended, the more exhaust gas interference is reduced. Front wheel drive(FWD) vehicle with disadvantage in packaging has worse low/mid range torque than rear wheel drive(RWD) vehicle . There were several cases to increase the distance in FWD vehicle. But they needed to accept disadvantages such as reducing size of other parts to place two bellows or deteriorating isolation performance because of eliminating a bellows. In this paper, the new exhaust system improving low/mid range torque by reducing exhaust gas interference in the FWD vehicle equipped with dual CVVT DISI V6 engine is studied. This new exhaust system with new type of bellows and semi-circular pipe keeps the existing performance as well as moves the junction 621mm to the rear. As the result, its verified that low/mid range torque is improved by 5%~6% and fuel efficiency by 0.3%~1.0% and driving performance by 1.7%~2.5%.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
