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GT-Power를 이용한 Dual Variable Cam Phaser(DVCP) 엔진의 Late Intake Valve Closing(LIVC)에 대한 연구
김동수(Dongsoo Kim),유창한(Changhan Yu),류명걸(Myungkeol Ryu),이문식(Moonsig Lee),김숭기(Soongkee Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The improvement of performance and fuel economy are key goals of engine development nowadays, variable cam phaser system has been widely adapted in order to satisfy them. The variable cam phaser system can improve fuel economy by reducing pumping loss and heat transfer loss. Using GT-power cam duration and parking MOP of DVCP has been optimized from fuel economy and WOT performance viewpoint and engine dynamometer test has been performed to prove the result of GT-power for next generation of mini engine. Key parameters such as residual gas, combustion stability and pumping loss are proposed to be considered for LIVC application.
차량 틸팅 시험을 이용한 엔진 오일 레벨 평가에 대한 연구
김정석(Jeongseok Kim),채강석(Kangseog Chae),김숭기(Soongkee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The purpose of present study is to investigate the influence of vehicle acceleration such as cornering, braking and acceleration on the engine oil starvation phenomenon of the internal combustion engines. In the starvation condition, oil pressure is not maintained in an engine due to the air entering at the suction pipe inlet. Computer aided analysis is useful to simulate oil movement under the worst case and design can be easily changed based on analysis result, but the analysis can’t consider oil quantity under the real vehicle running condition. Engine bench tilting test is more accurate to evaluate the oil starvation, but it is hard to simulate maximum transient tilt angle. It is important that all tilt stands used to test the engine lubrication system should be capable of achieving tilt speed as close to the vehicle condition as possible since the speed may have an impact on the oil pressure. In the present study, vehicle tilting test is introduced for most effective evaluation on the engine oil starvation phenomenon. Test procedure and result evaluation criteria of the vehicle tilting test are also presented.
Refueling Simulation을 위한 이론적 접근
정종현(Chonghyeon Cheong),김숭기(Soongkee Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
Refueling emission(ORVR) means the hydrocarbon gas emitted from the vehicle during a refueling operation. This refueling emission is affected by many design factors such as canister's working capacity, fuel system's leakage, fuel tank's volume and fuel's RVP, etc. In this paper, the governing equation of pressure and hydrocarbon evaporation in fuel tank during a refueling operation is derived and the effect of each factor is evaluated with simulation program. According to the refueling simulation proposed in this paper, fuel's RVP and fuel filler's size are main factors of refueling emission if canister's working capacity is sufficient and leakage is not big. If the size of leakage is below the specific value, the effect on refueling emission is not big. But, if above specific value, the leakage's effect is rapidly increased.
홍순성(Soonseong Hong),이진호(Jinho Lee),민선기(Sunki Min),김숭기(Soongkee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
DFSS (Design for Six Sigma) is a very useful method to optimize product design in various fields of the industry. This paper presents the implementation of the DFSS method to optimize an engine intake manifold with PDA system. The focus of optimization is to maximize the swirl strength and mass flow rate in the cylinder chamber. There are so many factors that affect the swirl strength and mass flow rate in intake manifold system, but only six main control factors such as plenum shape, primary and secondary length, port diameter, primary pipe section shape, etc. are adopted. The L18 orthogonal table is used for calculating CFD simulation to evaluate the swirl number and mass flow rate in the cylinder chamber.
1D Simulation을 이용한 엔진 저속성능 개선에 관한 연구
노종원(Jongwon Noh),이재욱(Jaewook Lee),민선기(Sunki Min),김숭기(Soongkee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In many case, most diver drive in low-medium rpm range. In particular, the low rpm engine performance impact on vehicle start-ability and fuel economy more than high rpm performance. There is trade off between low rpm performance and high rpm performance. Therefore, it is important to select appropriate valve profile to improve low speed performance retaining high speed performance. DVCP valve train system is one of the promising technologies to achieve optimized engine performance in engine operating range by alternating valve opening timing. In this paper, various valve profiles were evaluated in term of low speed performance without significant performance sacrificing in high speed. Valve timing of each profile was optimized to archive high volumetric efficiency using DVCP. Fuel efficiency in part load condition was evaluated through BSFC.
Dynamic Engine Test Bench를 이용한 가솔린 차량의 Emission Test에 관한 연구
이상수(Sangsu Lee),이근봉(Keunbong Lee),이문식(Moonsig Lee),김숭기(Soongkee Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The fuel consumption and emissions from gasoline vehicle with MT and AT were tested using a dynamic engine test bench. The engine was dynamically controlled to simulate the dynamic behavior of engine inside the vehicle in motion. The variation of EMS data in vehicle such as engine speed, MAP and gear stage was closely reproduced with engine test bench by using inertia simulation and control software and found to reproduce fuel economy around ±1%, and emissions around ±10%. The forced soaking procedure, signal generator for TCU, realistic coolant temperature profile and idle MAP increased by dyno friction were tried for better correlation with vehicle data.
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.
차세대 알루미늄 피스톤의 신뢰성 검증을 위한 내구특성 평가
조일환(Ilhwan Jo),이형상(Hyungsang Lee),김희붕(Heuiboong Kim),장현모(Hyunmo Jang),김동연(Dongyeon Kim),김숭기(Soongkee Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Each automobile company has their own process to validate durability characteristic of their own product. As customer has been focusing initial quality of vehicle, automobile companies try to improve their validation process and work up to enhance initial quality and durability. In case of engine development, engine must be validated its durability characteristic at max load and max power condition, speed transient condition, hot & cold condition and each engine's specific running condition. In this study, after increasing combustion pressure up to 180 bar, initial durability validation cycle which is consisted of high load & high power condition, city cycle condition and vehicle simulation cycle condition was applied for verifying next generation aluminum piston durability characteristic.