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통합 샤시 제어를 위한 횡방향 안전성 판단 조건에 관한 연구
안국진,좌은혁,고영일,이경수,손기모,Ann, Kookjin,Joa, Eunhyek,Koh, Youngil,Yi, Kyongsu,Sohn, Kimo 한국자동차안전학회 2017 자동차안전학회지 Vol.9 No.2
This paper presents the lateral stability criteria for integrated chassis control. To determine the intervention timing of chassis control system, the lateral stability criteria is needed. The proposed lateral stability criteria is based on velocity-yawrate gain domain to determine whether vehicle is stable. If the yawrate gain violates the proposed criteria, the stability of the vehicle is considered as unstable. Characteristic velocity and critical velocity are employed to distinguish lateral stability criteria. The inside of the two boundaries is stable and the outside is unstable. If yawrate gain of vehicle violates the lateral stability criteria, the chassis control begin to intervene. To validate the lateral stability criteria, both computer simulations and vehicle test are conducted with respect to circular turn scenario. The proposed lateral stability criteria makes it possible to reduce intervention of chassis control system.
기동성을 위한 후륜 조향 차량의 최적 성능에 대한 연구
안국진,좌은혁,박관우,윤영식,이경수,Ann, Kookjin,Joa, Eunhyek,Park, Kwanwoo,Yoon, Youngsik,Yi, Kyongsu 한국자동차안전학회 2019 자동차안전학회지 Vol.11 No.2
This paper presents an optimal performance of rear wheel steering vehicle for maneuverability. The maneuverability of vehicle is evaluated in terms of yaw rate, body slip angle and driver input. The maneuverability of vehicle can be improved by rear wheel steering system. To obtain optimal performance of rear wheel steering vehicle, the optimal control history is designed. The high dimensional trajectory optimization problem is solved by formulating a quadratic program considering rear wheel steer input. To evaluate handling performance 7 degree-of-freedom vehicle model with actuation sub-models is designed. A step steer test is conducted to evaluate rear wheel steering vehicle. A response time, a TB factor, overshoot, and yaw rate gain are investigated through objective criteria, assessment webs. The handling performance of vehicle is evaluated via computer simulations. It has been shown from simulation studies that optimal controlled rear wheel steering vehicle provides improved performance compared to others.
안국진(Kookjin Ann),민형기(Hyeong Ki Min),한규홍(Kyuhong Han) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
This paper presents a modeling and performance analysis for braking system of 6 wheel vehicle. The braking system of 6 wheel vehicle is consisted of hydraulic brake and electronic parking brake. The electronic parking brake can be used when the hydraulic brake system is failed. To predict the braking performance, the vehicle and braking system was modeled via TruckSim/Matlab software. Based on the vehicle model, braking simulation is conducted in various scenarios. The performance of the braking system was analyzed by the simulation using the implemented vehicle model.