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양호림(Horim Yang),김범수(Beomsu Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently increasing number of gears for automatic transmission is main trend for development of automatic transmission, and its main target are a further significant reduction in fuel consumption and emissions, good driving performance. Surely increasing number of gears enables to reduce fuel consumption and good driving performances, because it also increases the number of available engine operating points, and enables engine to operate in more efficient states. In addition to these merits, increasing number of gears necessarily results in system loss, for example, a growth of cost and weight of automatic transmission and an increase of drag torque of friction components. To determine a reasonable number of gears, the fully consideration of these effects of increasing number of gears for automatic transmission is necessary. The analysis software for evaluating system performances was developed, and the analysis on the effects of fuel economy, acceleration performance, drag torque and hybridization was presented.
특정 주행 사이클과 임의의 주행 사이클에서 병렬형 하이브리드 차량의 용량 매칭 기법
양호림(Horim Yang),박영일(Yeong-il Park),이장무(Jang-moo Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, we presented two methods for deciding the component sizes of HEV. The first mehod is based on the simulations upon specific driving cycles. It uses fuel economies and acceleration performances of the vehicle from the simulations. The second method uses the fuel economy improvement estimation to the power demand and does not depend on certain driving cycles. The two methods were applied to find the best component combination of a given HEY.<br/>
양호림(Horim Yang) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
To improve vehicle fuel economy, it is important to develop the transmission having high efficiency. And highly accurate and convenient analysis model is necessary for developing efficient transmission system. This paper describes the development of the model for analyzing automatic transmission system efficiency. Firstly, the friction models of components in automatic transmission are developed, and its accuracy is verified by a comparison between test and analysis results. Secondly, 8-speed automatic transmission system is developed by arrangement and connection of friction component models for analyzing system efficiency. Finally, by a comparison to test results it is verified that system model as well as component model have high accuracy.
Tip-in 충격 해석을 통한 PT 마운팅 시스템 특성 영향도 연구
양호림(Horim Yang),장욱진(Wookjin Jang) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Tip-in shock is the oscillation occurred by a sudden push of the accel pedal. The oscillation is in the 2-10 ㎐ range, which are the most sensitive frequencies for the human body, and the driver/passenger experiences a great discomfort if the amplitude of the oscillation is too large. Various factors affect the amplitude of tip-in shock, and this paper focuses on the influence of automotive powertrain mounting system among them. An analysis model for evaluating the influence of powertrain mounting system characteristics on the amplitude of tip-in shock has been developed and evaluated, and will be presented in this paper.
입력 분기식 하이브리드 동력전달계의 배터리 사용 최적화
양호림(Horim Yang),박영일(Yoengil Park),차석원(Sukwon Cha) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is very important for the fuel economy of hybrid electric vehicle to determine when a battery should be used. Optimal battery use can be determined by the optimization methods such as Dynamic Programming and Pontryagin’s Minimum Principle, however these methods needs so much times. In this paper, the variable FCpp was proposed, which represents the efficiency of a battery use. The lower FCpp means that using battery is more efficient. It is possible to conclude the times of battery use by comparison of FCpp at various situation, and also determine the cruise mode of hybrid electric vehicles.
양호림(Yang, Horim),전순일(Jeon, Soonil),박영일(Park, Yeongil),이장무(Lee, Jangmoo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
In this research, we presented the regenerative braking algorithms considering fuel economy and charging oftenness, and also analyzed these algorithms. The first algorithm was the regenerative braking algorithm for the ideal recovery of kinetic energy. The HEV using this algorithm had high fuel economy, on the other hand frequent charging was occurred. The second algorithm was the regenerative braking algorithm for reduction of the charging oftenness. Using this algorithm, the HEV had the low charging oftenness and small loss of fuel economy.
양시우(Siwoo Yang),김남욱(Namwook Kim),박영일(Yoengil Park),임원식(Wonsik Lim),차석원(Sukwon Cha),양호림(Horim Yang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Power split HEV systems such as THS have several control variables. Contrary to conventional internal combustion vehicles when torque is inputted from a driver at specified vehicle speed, torques and speeds of engine and two motors should be determined. There is a relationship between variables that satisfies required output state, however solutions show considerably different fuel efficiency with changing Battery SOC. To find optimal control values, firstly calculates the efficiency of a HEV system composed of one engine, two motors and a planetary gear system. The efficiency of a HEV system includes engine efficiency, motor efficiency and power recirculation. Based on the constructed system efficiency map, optimal points can be determined with fixing a SOC level at specific output state. Then the only remained task which is changeable at discretion is determining SOC levels. By dynamic programming the optimized SOC path can be obtained easily. The results of this simulation shows some tendencies that are applicable to a cruising control strategy.
유성기어식 하이브리드 동력전달계의 모드 변환에 따른 동특성 해석
이대흥(Daeheung Lee),양호림(Horim Yang),박영일(Yongil Park),차석원(Sukwon Cha) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The Transient characteristics affect to a passenger and driver in a vehicle when a hybrid vehicle changes a driving mode which is motor(EV) mode, engine mode, hybrid mode, etc. In this study, the analysis of transient characteristics for a HEV powertrain is carried out and the ride quality of the vehicle at the situation of mode change is analyzed. To perform a dynamic analysis, we construct the dynamic model by using ADMAS and define situations as mode change.