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LPG 엔진오일 열화도 모니터링을 통한 엔진마모도 연구
전경주(Kyoungju Jeon),이정근(Jungkeun Rhee),용승열(Seungryoul Yong),박민희(Minhee Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In order to cope with more stringent emission regulation and durability requirement, it is necessary to reduce engine oil consumption, to extend oil life and to enhance reliability of engine durability. The composition analysis of engine lubricants is one of the essential methods for these purposes in the automotive companies. This paper describes the analysis method and understanding for engine wear ratio trough oil sample analysis test results and the test uses two LPGi 2.0 liter engine. Also, the test items are performed which element, viscosity and soot content by TGA for oil condition monitoring.
송재은(Jaeeun Song),이정근(Jungkeun Rhee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As many diesel engines are utilized in middle class or compact cars, the demands for quiet and good sound quality in diesel engine also increase more and more. High combustion pressure in idle and light load acceleration mode makes it difficult to make low noise like that of gasoline engine, but the sound quality can be enhanced by introducing DOE. For the complete improvement of diesel engine sound quality, it is necessary to consider the combustion and mechanical noise. But it is thought that the reduction of the combustion noise can show us a short way to get full improvement. The most important factor to be considered in this study is to find the optimum combustion conditions without any deterioration of emission level and drivability. This paper includes the DOE method as a tool to find out the optimized combustion conditions, which is possible to realized better sound quality in idle through that method without deteriorating the important two limited conditions.
가솔린 극초저배출 차량의 후처리 시스템 Burning-out과 Canister Purge-Loading조건에 따른 시험적 배출가스 영향성 연구
홍종열(Jongyeol Hong),김석철(Sukchul Kim),이정근(Jungkeun Rhee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The effects of exhaust emission for Gasoline SULEV has been regulated in the world wide regulations such as Korea and U.S.A market under FTP 75 mode is very important to develop SULEV emissions because of SULEV emission standards are about 81% lower than ULEV. SULEV variability of emission results can be given an effect to develop and certify vehicle. it could be caused by test measurements that are focused on the ambient air and Sample Bags purifies and vehicle preparations This paper shows that test vehicle preparations and test equipment effects like vehicle after treatment poisoning, Canister loading/purge condition and using clean bag effect with SULEV gasoline vehicles,.
이한승(Hanseung Lee),이창호(Changho Lee),이정근(Jungkeun Rhee) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Nowadays, high efficient and low emission vehicle was developed due to the depletion of petroleum resources and solving the environmental pollution in the automotive industry. In addition to that, the quiet and comfortable vehicle has developed for deflecting customers concerns about NVH(noise, vibration, harshness). Shuffle mode is one of the common phenomena of the vehicle driveline NVH. Also, the vehicle shuffle can influence driveline clunk with manual transmission. The aim of this study is to reduce driveline clunk with the several influence factors. The moment of inertia of flywheel, gear ratios and characteristics of clutch disc are the key influencing parameters for driveline shuffle and clunk. In this paper, torsional vibration of driveline system has been simulated using AMESim program and experimented in a front wheel drive, manual transmission vehicle. The simulation result was compared with the test data. Based on the above simulation and test results, the optimal driveline system could be determined with robust NVH performance enablers when integrated into vehicle in early design stage of the vehicle.
이남훈(Namhoon Lee),윤재원(Jaewon Youn),이정근(Jungkeun Rhee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
GM Korea has developed new CVT mini vehicle reflecting customers concerns about low fuel economy at high speed and lack of power in the current AT vehicle. Currently adopting CVT system is increasing due to following reasons. 1) CVT can provide better fuel economy than AT by enabling the engine to run at its most efficient rpm for a range of vehicle speeds and continuous gear ratio change. 2) It can be used to maximize the performance of a vehicle by allowing the engine to turn at the rpm at which it produces maximum torque and power. 3) It is more comfortable than AT by minimizing shift shock with continuous gear ratio change. But additional N&V issues, result in weight increase compare with AT, should be treated and optimized well. During the CVT vehicle development, rumble noise in vehicle interior was issued. Generally main source of rumble noise is crankshaft and powertrain bending but main contributor is structure-born noise transferred by engine and transmission mounting system. Rumble noise is problematic if mounting system design is not optimized for the powertrain vibration mode or it can’t minimize or amplify the powertrain rumble vibration. This paper shows root-cause of rumble noise and its improvement process which appeared in the CVT vehicle development process. Applying Red-X method, WOW BOB vehicles were chosen to compare the noise level difference and to estimate contribution and improvement potential of each component and N&V test have been carried out for these selected items.
수동 전륜 구동 차량에서의 출발 셔더 미케니즘에 관한 연구
윤재원(Jaewon Youn),송재은(Jaeeun Song),이정근(Jungkeun Rhee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper investigates the launch shudder phenomenon at the front wheel drive vehicle with manual transmission. The shudder is always accompanied with engine surge, wheel torsional vibration and mounts vibration resonance, especially powertrain roll motion. It means that shudder occurs according to the increase of external load come from vehicle drive system or road. In this study, the shudder mechanism model was created by experimental study of torsional behavior of powertrain and drive system components. One dimensional multi DOF vehicle torsional analysis model was created and used to verify reduction of shudder by increasing clutch hysteresis and adapting dual mass flywheel. To reduce the powertrain roll motion, mount property was changed and mount system was optimized.
엔진 하중에 의한 파워트레인 강제 응답 해석에 관한 연구
조미희(Mihui Jo),김충식(Choongsik Kim),이정근(Jungkeun Rhee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
To evaluate the engine dynamic stress, powertrain forced response analysis due to engine dynamic load was performed. Calculated cylinder pressure curves using 1D commercial software GT-Power were applied to engine dynamic simulation in order to extract detail load profile at each main bearing, piston side and combustion. Commercial software MSC. Nstran was used for powertrain forced response analysis due to this calculated engine loads.
Torsional Vibration Model을 이용한 Powertrain 거동 연구
이한걸(Hangeol Lee),송재은(Jaeeun Song),이정근(Jungkeun Rhee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Recently the research of powertrain torsional vibration behavior due to engine torque fluctuation has been widely studied. Shudder and Clunk are typical torsional phenomenon , which take places low frequency range from 10 ㎐ to 30㎐. This vibration is transmitted from many different locations towards indoor in vehicle and typically contributes to booming noise. In this paper, torsional vibration analysis model is developed in order to expect the torsional behavior of powertrain . At first, driveline torsional vibration model using AMESim is built. Then torsional vibration analysis is carried out under engine maneuver condition. It is found that clutch damper design is one of the main effective counter-measures to reduce torsional vibration.
북미 OBD Verification 절차 이해 및 국내 적용에 대한 고찰
손진희(Jinhee Son),정종현(Chonghyeon Cheong),이정근(Jungkeun Rhee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In current vehicle, OBD(On Board Diagnosis) function is installed. This OBD function monitors the vehicle of state related with emission. If there is a malfunction in the vehicle parts related with emission such as O2 sensors, OBD system turns on MIL(Malfunction Illumination Light) to make the driver repair the vehicle. OBD was adopted first in North-America from 1980s, in Europe from 2000, and in Korea from 2005. In 2013, Korea will adopt North-America’s OBD regulation(C.C.R 1968.2) in gasoline vehicle, and EURO-5 OBD regulation in diesel vehicle. North-America’s OBD regulation is more complicated and needs more time than domestic regulation. In domestic regulation, a OBD certification can be acquired by submitting a verification report and demonstrating some OBD cases before producing car. But, in North-America, 3 more verification reports must be added. One is Standard Requirement(J1699) Verification report which must be presented in 2months after producing the vehicles and the other is related with monitoring requirement defined in regulation. This verification report must be submitted within 6 months after producing car. The last one is related with in-use monitoring and must be submitted within 12 months after producing car. So, it is very helpful in coping with domestic OBD regulation change to study North-America’ the advanced OBD regulation in which the advanced technology is applied. And, understanding the difference between North-America’s OBD regulation and domestic regulation is essential to adopt North-America OBD regulation successfully without negative effect on automobile industry.