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윤장열(Jangyeol Yoon),조완기(Wanki Cho),이경수(Kyongsu Yi) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper describes a ITS-based vehicle rollover prediction, warning, and prevention algorithm. Based on the information, such as vehicle position and digital geographic road information, obtained from ITS infrastructure, this system predicts a danger of rollover in advance. This system gives a warning to driver if the vehicle is going to rollover in advance, and controls the vehicle speed in order to prevent rollover if the driver does not effort in spite of the warning. A vehicle safety speeds for rollover prevention are proposed for each road curvature by using simulation analysis with various driving situations. A rollover index is employed to decide the rollover propensity in simulation analysis. Computer simulations are conducted to verify the proposed rollover prediction and prevention algorithm using Carsim, vehicle simulation software. The proposed system can offer drivers safe driving circumstance and be an effective way to prevent the vehicle from rollover accidents.
실시간 주행 시뮬레이터를 이용한 통합섀시제어기의 성능 검증
윤장열(Jangyeol Yoon),조완기(Wanki Cho),임성진(Seongjin Yim),이경수(Kyongsu Yi),구본경(Bongyeong Koo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper presents human-in-the-loop evaluations of unified chassis control (UCC) system using a full-scale driving simulator based on a virtual test track (VTT). The UCC system which is designed in this study aims for the prevention of vehicle rollover and the improvement of vehicle stability such as maneuverability and lateral stability by integrating electronic stability control (ESC) and active front steering (AFS). The UCC system always works with the driver, the overall vehicle performance is depend not only on how well the controller works but also on its interaction with the human driver. Vehicle behavior and interactions among the vehicle, the UCC controller and the human driver are investigated using a driving simulator. Closed-loop simulation results at realistic driving situations have shown that the proposed UCC system prevents vehicle rollover and at the same time ensuring the vehicle stability, and reduces driving effort of a driver in extreme driving situations.
윤장열(Jangyeol Yoon),이경수(Kyongsu Yi),김동신(Dongshin Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes a rollover index (RI)-based rollover mitigation control (RMC) system. A rollover index which indicates an impending rollover has been developed by a roll dynamics phase plane analysis. The rollover index is calculated using roll angle, roll rate, lateral acceleration and time-to-wheel lift (TTWL). A differential braking control law for rollover mitigation based on a 2-D bicycle model has been designed using the direct yaw control (DYC) method. A RMC threshold has been determined from the rollover index. The performance of the RMC scheme, and the effectiveness of the proposed rollover index are illustrated using a vehicle simulator.
지능형 교통시스템을 위한 분산형 기지국의 최적경로 탐색 알고리즘
윤장열(Jangyeol Yoon),지용관(YongKwan Ji),허건수(Kunsoo Huh),조동일(Dong-il "Dan" Cho),박장현(Jhang-Hyon Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
In current ITS(Intelligent Transportation System), most route guidance services use cellularphone, PDA and navigation kit. Since these systems are depend on unilateral telecommunication, they guide almost drivers with same route. And it may cause traffic jam. Therefore, telecommunication system which can telecommunicate between vehicle and base station bilaterally and algorithm which is able to divide traffic flow are necessary to realize the efficient route guidance system.<br/> This paper introduces bilateral telecommunication system and proposes indexes such as 'Driving capability' and 'Route difficulty' to improve the performance of route guidance system. We can divide traffic flow by setting up the initial route individually based on driving capability and route difficulty in this system. If there is a traffic jam in the initial route, we can modify the route in local area temporarily by route modification algorithm. Therefore, we can realize the efficient route guidance system using above methods. The simulation results presented in this paper verify the proposed method.
차량의 롤 상태추정기를 이용한 Rollover Index 개발
윤장열(Jangyeol Yoon),정래욱(Raewook Chung),정태영(Taeyoung Chung),이경수(Kyongsu Yi) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
The development of an algorithm that detects impending rollover is described. The algorithm is intended for use in Unified Chassis Control. A Rollover index which indicates a roll danger is developed using roll angle and roll rate phase plane analysis. The Rollover index is calculated using roll angle, roll rate and lateral acceleration. Model-based roll estimator is designed to estimate roll angle and roll rate of vehicle body from lateral acceleration, yaw rate, steering angle and vehicle velocity. Performance of the roll estimator and effectiveness of the proposed rollover index are investigated by computer simulation. The simulation results show that the proposed roll estimator has good performance before wheel-lift-off and the rollover index indicates the rollover danger accurately.
윤장열(Jangyeol Yoon),김두형(Duhyung Kim),차종조(Chongjo Cha),정태영(Taeyoung Chung),여태정(Taejung Yeo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper presents a vision based Lane Following Control System (LFCS) and the experimental results of field operating test. The LFCS is more advanced and complicated system than the Lane Keeping Assist System (LKAS) which is in mass production. The proposed LFCS is designed based on the model predictive control method which includes the relation of vehicle and road. A steering torque is derived in real-time to follow the lane center line by using parameters which are acquired from camera. The performance of the proposed LFCS is evaluated via computer simulations and field test. It is verified that the proposed LFCS can be helpful for reducing the driver’s workload and can assist the driver during driving.
윤장열(Jangyeol Yoon),이경수(Kyongsu Yi),조완기(Wanki Cho),김동신(Dongshin Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This paper describes a Unified Chassis Control (UCC) strategy to prevent vehicle rollover by integrating individual modular chassis control systems such as Electronic Stability Control (ESC) and Continuous Damping Control (CDC). The UCC threshold is determined from a rollover index computed by estimated roll angle, roll rate and measured lateral acceleration. A direct yaw moment control method is used to design the ESC based on a 2-D bicycle model. Similarly, the CDC is designed based on a 2-D roll model using a direct roll moment control method. The performance of the proposed UCC scheme is investigated and compared to that of modular chassis controllers through computer simulations using a validated vehicle simulator. It is shown that the proposed the UCC can lead to improvements in vehicle stability and efficient actuation of chassis control systems.
정래욱(Raewook Chung),윤장열(Jangyeol Yoon),이경수(Kyongsu Yi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
This paper presents a method to estimate vehicle roll angle and roll rate for rollover index. An approach using a model-based estimator for roll angle and roll rate estimation of vehicle body with respect to the road is described. A simple roll dynamics model for the model-based estimator is used. Measured signals for the roll estimation algorithm are lateral acceleration, yaw rate, vehicle speed and steering angle. While existing roll estimation algorithms use a roll rate sensor, the proposed estimator do not use a roll rate signal. Performance and reliability of the roll estimator under various driving conditions are investigated by computer simulations. Simulation results show that the proposed roll estimator has reliable capability while all wheels are on the ground.