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HIL Simulator를 이용한 BAS(Brake Assist System) 평가방법 연구
고은석(Eunseok Ko),오승규(Seungkyu Oh),김형수(Hyungsoo Kim) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
According to the analysis of the rear collision, it showed that the accident was related by a lack of brake pedal effort when braking. Therefore, BAS(Brake Assist System) was developed to supplement or lack of a driver`s braking pedal pressure. Especially, In Europe (ECE R13H) and Korea (KMVSS 90) regulation, it was mandatory to apply BAS System to all of the vehicle which has been produced from 1 January 2015. In this reason, the industry has done a lot of work to develop and evaluate the BAS system. Especially in physical vehicle, it is difficult to evaluate the vehicle under same conditions, because, there are a lot of disturbance like driver`s ability and ware condition of tire. This study suggested the method for evaluating the BAS system using HIL Simulator that is possible to conduct test under always same conditions and analyzed the parameter affecting the results.
차량 모델 개선을 위한 Wheel Alignment 영향에 관한 연구
고은석(Eunseok Ko),이강원(Kangwon Lee),김형수(Hyoungsoo Kim),오승규(Seungkyu Oh) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Vehicles with Electronic Stability Control (ESC) sold in ECE countries must be evaluated with ECE Regulation 13H, which specifically encourages the use of simulation. Because a position of simulation increase as above, it required validated simulation vehicle model with performance same as actual vehicle. However, due to differences between actual vehicle and simulation model, the industry has done a lot of work to correlate these two factors. They are trying to working for correlation with actual vehicle performance. So. This paper is aimed to figure out how wheel alignment is important factor for reducing the difference between simulation and physical test by analyzing its effect. The value of Wheel alignment is calculated by DOE Kriging Method for analyzing influence of control factor and by optimization to minimize difference with physical test.
Understeer 상황에서 차량 안정성 향상을 위한 Brake Torque Vectoring에 대한 연구
고은석(Eunseok Ko),이강원(Kangwon Lee),김형수(hyoungsoo Kim) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
This paper study Brake Torque Vectoring that aims at enhancing vehicle stability and dynamic behavior in understeer condition. Recently, the vehicle makers in market introduce brake base torque vectoring function as a main contributor to vehicle dynamic management to improve cornering performance and agility from normal to critical driving. Brake Torque Vectoring is a function that can apply to a vehicle with low development cost and a short period of development time. The function can carry out a similar performance to Differential (Mechanical) Torque Vectoring System for highest performance application without additional hardware. This study will present improved agility and better cornering stability by comparing dynamic behavior through a development vehicle with optimally tuned Brake Torque Vectoring Function.
순환상관(Cyclic Correlation)을 이용한 OFDM 시스템에서의 블라인드 동기 알고리즘
박병준,고은석,강창언,홍대식,Park Byungjoon,Ko Eunseok,Kang Changeon,Hong Daesik 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.1C
본 논문에서는 OFDM 시스템의 시간 오차와 주파수 오차를 추정하는 방안을 제시하고 있다. 제안한 동기 알고리즘은 수신 신호의 순환상괸(cyclic correlation)을 이용하며, 이 순환상관에는 시간과 주파수 오차 정보가 모두 나타나게 된다. 따라서 제안하는 추정 알고리즘은 여분의 학습심볼(training symbol)를 필요로 하지 않으며, 채널의 정보를 사용하지 않는다. 제안한 추정 방법은 평균자승오차(mean square error) 성능에서 잡음이나 채널의 특성에 상관없이 거의 일정한 성능을 가지며, 실험 결과는 이러한 특징을 뒷받침 해주고 있다. 좀 더 정확한 추정을 위해서, 순환 상관을 평균을 취하는 방법이 적용되었다. 이 경우, 평균을 취하는 방법은 평균을 취하지 않는 방법보다 훨씬 더 정확한 추정을 가능하게 한다. In this paper, blind synchronization algorithm is developed for estimating jointly timing and frequency offset of OFDM system. The proposed estimator exploits the second-order cyclostationarity of received signals, and then uses the information of symbol timing and carrier frequency offset appeared in the cyclic correlation. As a bling estimator, the information of impulse response of channel and training symbols are not required. The performance of the proposed method is consistent in spite of channel conditions in mean squre error sense, and simulation results prove it. For more accurate estimaion, the method that averages cyclic correlation is applied. In this case, the performance of averaging method is better.
Loss-Function을 이용한 내수 시장의 HSA 최적 Holding Time 고찰
이강원(Kangwon Lee),고은석(Eunseok Ko),구형찬(Hyoungchan Koo) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
The hill start in manual or automated manual transmission vehicles is faced by most users as inconvenient situation. In the time interval between brake pedal releasing and gas pedal pressing, the car might roll backwards, causing an unsafe or at least uncomfortable situation. Hill Start Assist system (HSA) is one of value additional functions (VAF) that assist to driver on hill road. This function currently presented offers a simple solution that assists the driver in such situation, keeping the vehicle stopped while the driver releases the brake pedal in hill condition with ESC solenoid valve control. Many control engineers usually spend much time for performance tuning such as standstill - fast stop with determining the slope, rollback and drag feel - smooth brake pressure release without reclining feeling backward. But they do not much care about Hill Holding Time. In this paper, we tried to find out the Korea market customer requirement about HSA Holding Time through consumer clinic and analyzed survey results with Regression Equation Model of the Loss Function.