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이경수(Yi.Kyongsu) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The peak dynamic tire loads. which are greatly in excess of static loads. are highly dependent on the dynamic characteristics of vehicle suspensions. Analytical research has shown that the vehicle-generated pavement damage can be reduced by using more advanced suspensions. This paper describes a proposed semi-active suspensions for heavy vehicles to reduce the dynamic tire forces. Simulation studies are presented to compare the performance of the advanced suspensions with the four leaf tandem suspensions.<br/>
이경수(Kyongsu Yi),최재웅(Jaewoong Choi) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.12
본 논문은 종/횡방향 충돌 회피 시스템의 통합을 통한 통합 위험 관리 시스템 (IRMS) 에 대하여 기술하였다. 이를 위하여 종/횡방향 충돌 위험을 나타낼 수 있는 지표가 개발되었으며, 이를 통하여 통합 제어 전략을 구성하였다. 충돌 회피 제어를 위하여 운전자-제어기-차량 시스템에 대한 선형 모델을 구성, 이를 바탕으로 운전자-제어기간 협력을 통한 충돌 회피 제어 알고리듬을 개발하였다. 개발된 통합 위험 관리 시스템은 차량 동역학 모의 시험 프로그램인 CARSIM 과 MATLAB/Simulink 를 연동, 모의시험을 통하여 성능을 확인하였다. This paper presents an Integrated Risk Management System (IRMS), which is designed to integrate longitudinal and lateral collision avoidance systems. Indices representing longitudinal and lateral collision risks are designed. From the designed indices, an integrated control strategy is designed. A collision avoidance algorithm is designed to assist the driver in avoiding collisions by using a vehicle-driver-controller integrated linear model. The performance of the proposed algorithm is investigated via computer simulations conducted using the vehicle dynamics software CARSIM and Matlab/Simulink.
이경수(Kyongsu Yi),최재웅(Jaewoong Choi) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.4
본 논문은 종/횡방향 충돌 회피 시스템의 통합을 통한 통합 위험 관리 시스템 (Irms)에 대하여 기술하였다. 이를 위하여 종/횡방향 충돌 위험을 나타낼 수 있는 지표가 개발되었으며, 이를 통하여 통합 제어 전략을 구성하였다. 충돌 회피 제어를 위하여 운전자-제어기간 협력을 통한 충돌 회피 제어 알고리듬을 개발하였다. 개발된 통합 위험 관리 시스템은 차량 동역학 모의 시험 프로그램인 CARSIM과 MATLAB/Simulink를 연동, 모의시험을 통하여 성능을 확인하였다. This paper present IRMS(Integrated Risk Management System) which is designed to integrate longitudinal and lateral collision avoidance systems. Indices represent longitudinal and lateral collision risks are designed. Collision avoidance algorithm is designed to cooperate with driver to avoid collision using vehicle-driver-controller integrated linear model. The performance of proposed algorithm has been investigated via computer simulation conducted to vehicle dynamic software CARSIM and Matlab/Simulink.
이경수(Kyongsu Yi),문일기(Ilki Moon) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.2
This paper presents a vehicle control algorithm for stop and go cruise control systems which makes the vehicle remain at a safe distance from a preceding vehicle according to the driver's preference, automatically slow down and come to a full stop behind a preceding vehicle. The control algorithm consists of speed and distance control algorithm and a combined throttle/brake control law. Throttle and brake actuators are controlled by the throttle/brake control law so that the vehicle acceleration tracks the desired acceleration designed based on the vehicle speed and distance control algorithm. A stepper motor and an electronic vacuum booster have been used for the throttle and brake actuators. The throttle and brake actuators have been tested and the actuator dynamics has been incorporated in simulation study. The uncertainties of vehicle model have been considered in the design of the control law. The effect of throttle/brake control has been investigated via simulations. The simulations were performed using a complete nonlinear vehicle model. The results indicate that the proposed control law can provide the stop and go cruise control system with a good distance and velocity tracking performance.
4WD 전기 차량의 선회 성능 및 횡방향 안정성 향상을 위한 주행 제어 알고리즘 개발
서종상,이경수,강주용,Seo, Jongsang,Yi, Kyongsu,Kang, Juyong 한국자동차안전학회 2013 자동차안전학회지 Vol.5 No.1
This paper describes development of 4 Wheel Drive (4WD) Electric Vehicle (EV) based driving control algorithm for severe driving situation such as icy road or disturbance. The proposed control algorithm consists three parts : a supervisory controller, an upper-level controller and optimal torque vectoring controller. The supervisory controller determines desired dynamics with cornering stiffness estimator using recursive least square. The upper-level controller determines longitudinal force and yaw moment using sliding mode control. The yaw moment, particularly, is calculated by integration of a side-slip angle and yaw rate for the performance and robustness benefits. The optimal torque vectoring controller determines the optimal torques each wheel using control allocation method. The numerical simulation studies have been conducted to evaluated the proposed driving control algorithm. It has been shown from simulation studies that vehicle maneuverability and lateral stability performance can be significantly improved by the proposed driving controller in severe driving situations.
이태영,이경수,이재완,Lee, Taeyoung,Yi, Kyongsu,Lee, Jaewan 한국자동차안전학회 2013 자동차안전학회지 Vol.5 No.1
This paper presents a development of the Advanced Emergency Braking (AEB) Algorithm for passenger vehicles. The AEB is the system to slow the vehicle and mitigate the severity of an impact when a rear end collision probability is increased. To mitigate a rear end collision, the AEB comprises of a millimeter wave radar sensor, CCD camera and vehicle parameters of which are processed to judge the likelihood of a collision occurring. The main controller of the AEB algorithm is composed of the two control stage: upper and lower level controller. By using the collected obstacle information, the upper level controller of the main controller decides the control mode based not only on parametric division, but also on physical collision capability. The lower level controller determines warning level and braking level to maintain the longitudinal safety. To decide the braking level, Last Ponit To Brake and Steer (LPTB/LPTS) are compared with current driving statues. To demonstrate the control performance of the proposed AEBS algorithm's, closed-loop simulation of the AEBS was conducted by using the Matlab simlink and CarSim software.