http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Post Injection을 이용한 Diesel Engine의 Turbo Lag개선 및 가속성능 향상
윤동필(Dongpil Yoon),박상운(Sangun Park),이근봉(Keunbong Lee),박영현(Younghyun Park),김숭기(Soongkee Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Growing concern about increasing greenhouse gases (GHG) today, automobile industry is highly requiring stricter emission regulations and improved fuel consumption. It means that engine development should be more focused on a high efficiency and small displacement engine. To achieve for this demand, one of the effective method is reduction of the engine size by using a turbocharger or supercharger. Turbocharged boost technologies are able to increase thermal efficiency. However, the turbocharged downsized engines generally have worse response than the naturally aspirated (NA) engines because it takes a few seconds to get the turbocharger rotate up to high speed, usually called "Turbo-lag". In order to solve this matter, one possible way is hard solution: some changes in intake/exhaust layout and turbo inertia can be considered, or more sophisticated systems such as a two-stage turbocharger or a supercharger. Different way is soft solution to avoid it: some variables to control the turbocharging systems are optimized. This paper deals with the transient response of a common rail diesel engine with variable geometry turbocharger (VGT). In the paper, a DFSS method was used and also analyzed each factor which influence to turbo lag. The researches discussed focused on soft solution from the result of this analysis. The control strategy is based on the optimization of post injection with conventional VGT control at various transient engine conditions. Also, we developed the algorithm of driver’s intention to accelerate rapidly based on the driver demand. Reflecting driver’s intention selectively, the control strategy for transient response is capable of improving the vehicle acceleration performance with minimum deterioration of total smoke emissions and fuel consumption during the sudden acceleration.
Brake Torque Vectoring을 이용한 차량의 운전성 향상에 대한 연구
이종일(Jongil Lee),김인용(Inyong Kim),구형찬(Hyoungchan Koo),김형수(Hyoungsoo Kim),김영우(Youngwoo Kim),오승규(Seungkyu Oh),노지훈(Jihoon Roh),윤동필(Dongpil Yoon),이강원(Kangwon Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper presents a mathematical model of multi-dynamic vehicle model. A torque vectoring brake (TVB) system is proposed to improve the stability and the agility of vehicle. The algorithm of TVB system is proposed based upon a sliding model controller. The proposed algorithm optimizes control of wheel slip during the inside of vehicle wheel slip. ISO standard test procedure is used to evaluate the performance of TVB system. The TVB performance is numerically implemented using MATLAB and CarSim commercial software. The simulation results show the acceptable performance of TVB comparing without TVB. For conclusion, the TVB system is developed and evaluated to improve vehicle dynamic characteristics and handling performance. The TVB system shows the better handling performance and agility specially under-steer control situation.