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정호운(H. U. Jeong),이화영(H. Y. Lee),김완수(W. S. Kim),황성호(S. H. Hwang) 유공압건설기계학회 2016 유공압건설기계학회 학술대회논문집 Vol.2016 No.6
Power losses of DCT(Dual Clutch Transmission) is an import factor for powertrain power transfer efficiency and consequently the vehicle"s fuel efficiency. The net power transfer efficiency of DCT and the net power loss can be measured by a dynamometer, but it had not been possible to measure losses from specific components and its percentage contribution to the net loss. Therefore, this paper suggests a method which includes type classification of each losses from DCT and quantitative prediction of losses based on theoretical formulas. And a simulation model was developed for computing dynamic loads on each components and their rotational speed. With the simulation losses from each components, which depend on temperature, torque, and rotational speed, was calculated and then the percentage contributions to the transmission"s net loss was analyzed.
디젤 플러그인 하이브리드 자동차 연비평가 시뮬레이터 개발
정호운(H. U. Jeong),심규현(K. H. Sim),김동렴(D. R. Kim),정래상(R. S. Jeong),한관수(K. S. Han),황성호(S. H. Hwang) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.9
Diesel engines have some advantages over gasoline engines. Diesel engines can produce more torque in low speed and have higher fuel efficiency and make less carbon dioxide. There have been many studies that improve fuel efficiency of diesel engines, and diesel hybrid system emerges as most practical method out of the studies. Plug-in Hybrid Electric Vehicles (PHEV) can recharge batteries from urban electric grid system. PHEV can drive with only motor for some distance, which increases fuel efficiency. To evaluate fuel efficiency of different types of diesel PHEV systems, important components of PHEV power split system have been modeled by MATLAB Simulink. Torque and efficiency characteristics of diesel engine and Motor/Generator uses resized actual experimental data. Batteries, Clutches, Transmissions have been modeled as equations. Finally a DCT TMED system has been composed by adding controller of each module to verify system modeling.
타이어 슬립과 조향작동장치의 성능을 고려한 무인자동차 자율주행 제어
박찬호(C. H. Park),곽기성(G. S. Gwak),정호운(H. U. Jeong),홍도의(D. U. Hong),황성호(S. H. Hwang) 유공압건설기계학회 2015 드라이브·컨트롤 Vol.12 No.3
An autonomous vehicle control algorithm based on Ackerman Geometry is known to be reliable in low tire slip situation. However, vehicles at high speed make lateral errors due to high tire slip. In this paper, considering the tire slip of vehicles, the steering angle is determined based on the Ackerman Geometry and is supplemented tire slip angle by the Stanley steering algorithm. In addition, to prevent the tire slip, the algorithm, which restricts steering if a certain level of slip occurs, is used to reduce the lateral error. While many studies have been extended to include vehicle slip, studies also need to be carried out on the tire slip depending on hardware performance. The control algorithm of autonomous vehicles is compensated considering the sensor noise and the performance of steering actuator. Through the various simulations, it was found that the performance of steering actuator was the key factor affecting the performance of autonomous driving. Also, it was verified that the usefulness of steering algorithm considering the tire slip and performance of steering actuator.
독립구동 인휠 전기자동차의 주행 효율 최적화를 위한 구동력 분배 알고리즘
박진현(J. H. Park),송현우(H. W. Song),정호운(H. U. Jeong),박찬호(C. H Park),황성호(S. H. Hwang) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
The purpose of this paper is to construct a control algorithm for improving the driving efficiency of 4-wheel-drive in-wheel electric vehicles. The main parts of the vehicle were modeled and the input-output relations of signals were summarized using MATLAB/Simulink. A performance simulator for 4-wheel-drive in-wheel electric vehicles was developed based on the co-simulation environment with a commercial dynamic behavior analysis program called Carsim. Moreover, for improving the driving efficiency of vehicles, a torque distribution algorithm, which distributes the torque to the front and rear wheels, was included in the performance simulator. The effectiveness of the torque distribution algorithm was validated by the SOC simulation using the FTP-75 driving cycle.