• 오토저널
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• 제3권3호
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• pp.1-7
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• 1981

재래적 자동차의 구동계통은 동력원 즉 engine이 앞에 위치하고 뒤에서 미는 순서로 되어 있다. 그러므로 engine 과 차축을 연결하는 이 축(또는 구동계통)은 engine으로 부터의 힘을 차축으로 전달하는 역할을 하며 기본적으로 비틀상태의 반성부재로서 비교적 큰 회전 insertia를 받게 된다. 구동축은 한 개 또는 그 이상의 universal joint와 solid 상태 또는 관으로 된 축으로 조립 되어 있다. 그리하여 축방향의 동작을 통해서 토오크를 전달하고 일정한 각도 또는 변화되는 각도에서 회전운동을 한다. 차축은 차체 spring을 통해서 부쳐져 있으므로 주행중 구동축은 축 방향의 길이의 변화가 있게 되며 따라서 연결돤 각동작이 일어나며 이를 위해서는 universal joint가 필요하게 되며 따라서 전륜구동차에서도 필요하다. 자동차에 적용되고 있는 구동적에는 두가지 기본형이 있는데 torque tube형 구동방법과 hotchkiss형(또는 open driveline형) 구동방 법이다. Torque tube형 구동방식은 근래에는 사라져 가고 있는데 그 주요원인은 구동계통에서 발생되는 소음이 튜브를 통해 증축 전달되며 수리비용이 비교적 큰 때문이다. 이에 비해 open driveline형의 이점은 제조원가가 낮고, 용이하게 제조할 수 있으며, 종량이 경강되며 장착하기 에도 용이한 점들이다.

• 드라이브 ㆍ 컨트롤
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• 제11권1호
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• pp.14-24
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• 2014

Variable displacement vane-type oil pumps represent one of the most innovative pump types for industrial applications, especially for engine lubrication systems. This paper presents a complete and accurate mathematical model for a typical variable displacement vane-type oil pump. Firstly, its theoretical model is revised. Secondly, an analysis of power loss factors of this pump type is carefully investigated to optimize the modeling accuracy. Finally, the estimated pump performance using the complete pump model is verified by numerical simulations in comparison with the practical tests.

• 대한기계학회논문집
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• 제19권10호
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• pp.2690-2698
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• 1995

Fuel atomization and mixture formation in an gasoline engine has influence on the engine performance and pollutant emission. The throttle valve installed in an intake system plays a greater role in control of mixture quantity in accordance with engine drive condition. In this study, the characteristics of secondary atomization developed at the downstream of the valves were observed using an image processing method. Two major kinds of valves, solid and perforated ones, are chosen in order to compare the valve performance with the experimental parameters of air flow rate, valve opening angle, and valve shapes. For the perforated valve, we can obtain the relatively small sized droplets, and nearly uniformed and dense distributed sprays with low loss coefficient than for the solid valve.

• 신재생에너지
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• 제1권4호
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• pp.55-59
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• 2005

In this paper, a new drive system(SHS) for hybrid electric vehicle is proposed. As dual rotor hybrid electric vehicle using planetary gearsets, the SHS has the advantages of both series and parallel systems. The output speed and torque of SHS can be determined at specific point regardless of the engine's operating point. When the size of generator which is used in SHS is same as in THS, the SHS has more activities of engine control due to the ability that is operated in lower speed range. To maximize the performance of system, we carried out optimization for the three parameters that are engine, motorl and motor2. As the result of the optimization, we confirmed the SHS is more preferable to THS in fuel consumption and acceleration area.

• 한국자동차공학회논문집
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• 제3권2호
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• pp.102-111
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• 1995

The non-periodic fluctuation of the engine torque appears to be the major source of the torsional vibration of the automotive driveline. The reduction of this torsional vibration has become a significant problem along with the requirements of higher performance. The torsional vibration of the automotive driveline can be reduced by smoothing the fluctuation by adjusting the torsional characteristics of the clutch-disc. Computer simulation of the driveline is a useful investigative tool on studying the torsional characteristics of the clutch-disc. In this paper, a dynamic model for the automotive driveline was developed, and the engine torque of the model were evaluated with experimental data. By executing a simulation using the model, it has become possible to obtain the clutch-disc torsional characteristics for reducting the torsional vibration at creeping.

• Journal of Advanced Marine Engineering and Technology
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• 제38권7호
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• pp.877-882
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• 2014

국제해사기구 해양환경보호위원회에서 그린하우스가스(GHG)의 주범인 CO2 배출량 감축을 위해 선박에서 대기로 방출하는 CO2의 양을 지수화 하고자 활발한 논의가 진행되고 있다. 이에 따라 에너지 효율 개선을 위해서 선체의 설계변경, 마찰저항을 줄이기 위한 도료개발, 엔진의 열효율을 개선하기 위한 첨가제 개발, 연료를 절감하기 위하여 저속운전 등 다양한 방법들이 적용되고 있다. 선박의 주 기관에서는 전 부하영역에서 효율을 높이기 위하여 전자엔진이 사용되고 있으나, 선박용 발전기 엔진은 여전히 캠으로 연료분사와 흡 배기 밸브를 구동하는 기계식 작동엔진이 대부분이다. 또한 선박용 발전기 엔진은 선박의 과부하 방지 시스템 내에서 운전되므로 대부분의 운전은 80% 이하의 부분부하 영역에서 사용되고 있다. 따라서 100%부하에 세팅된 발전기 엔진은 부분부하에서 효율적인 운전을 위해서는 연료분사시기 재조정이 필요하다. 본 연구는 현재 운항중인 선박발전용 디젤엔진의 운용특성을 파악하여 부분부하에서 연료분사시기 재조정을 통하여 연료소비량 개선에 관한 결과를 보고 하고자 한다.

• Journal of Advanced Marine Engineering and Technology
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• 제38권1호
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• pp.64-69
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• 2014

본 논문에서는 선박내의 에너지 절감을 위하여 주거구역 전원인 단상 220V 교류전원에 접속이 가능한 계통연계형 단상 인버터시스템을 제작하여 저주파 L-C 필터 정수 및 스위칭 펄스의 데드타임 변화에 따른 전고조파왜곡율(THD)의 변화를 분석하였다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 추계학술대회 초록집
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• pp.95-95
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• 2010

In recent, there are tremendous requirements to improve the fuel economy of vehicle. For satisfaction of requirements, Hybrid Electric Vehicle or other technologies are suggested and implemented. However, it should be noted that almost 35% energy loss is occurred in the shape of exhaust gas as ever. For increase the efficiency of vehicle, it is certain that the exhaust gas energy should be recover, and generate energy. In previous studies, the technologies such as turbo-compound, thermoelectric and rankine cycle are suggested to recover the exhaust heat energy in vehicle. But, they focus on the conventional vehicle or parallel Hybrid Electric Vehicle. Series Hybrid Electric Vehicle has advantage that the engine and drive shaft are de-coupled. It means that the engine can be operated in high efficiency area regardless with vehicle states. Therefore, if rankine cycle is applied to series hybrid electric vehicle, operating condition of that becomes almost steady. So, in this study, theoretical analysis on the efficiency of rankine cycle applied to series hybrid electric city bus is carried and the energy recovered from exhaust gas during vehicle drive cycle is calculated.

• Tribology and Lubricants
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• 제24권6호
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• pp.285-290
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• 2008

The purpose of this paper is to present the case study of tribological failure analysis on the gear damages, oil leakage, and sealant sealing in a manual transmission of front engine and front wheel drive vehicle. The manual transmission is to change the speed range and direction of the engines depending on the driving conditions by friction driving forces with input and output gear system. The material property and surface roughness of the gears are strongly related to the gear noise and micro-vibration, oil leakage and wear, which may decrease the real contact area of the gear and the strength of the oil film thickness between the driving gear and driven one. The O-ring damage of speedometer driven gear and bad sealant sealing of oil pan may produce oil leakage through the contact surfaces, which cause the oil shortage and seizure on the sliding surfaces of the transaxle gears. In the failure case study, the proper repair working and good lubrication are very important for the long life of the transaxle without any tribological failures and oil leakage.

• 한국자동차공학회논문집
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• 제19권1호
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• pp.17-24
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• 2011

TMED(Transmission Mounted Electric Device) parallel hybrid configuration can realize EV(Electric Vehicle) mode by disengaging the clutch between an engine and a transmission-mounted motor to improve efficiencies of low load driving and regenerative braking. In the EV mode, however, jerk can be induced since there are insufficient damping elements in the drive-train. Though the jerk gives demoralizing influence upon driving comport, adding a physical damper is not applicable due to constraints of the layout. This study suggests the jerk reduction control, composed of active damping method and torque profiling method, to suppress the jerk without hardware modification. The former method creates a virtual damper by generating absorbing torque in the opposite direction of the oscillation. The latter method reduces impulse on the mated gear teeth of the drive-train by limiting the gradient of traction torque when the direction of the torque is reversed. To validate the effectiveness of the suggested strategy, a series of vehicle tests are carried out and it is observed that the amplitude of the oscillation can be reduced by up to 83%.