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곽병학(Byunghak Kwak),이신애(Shinae Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
ESP system can enhance the vehicle stability and handling in an emergency situation through the control of<br/> traction and braking forces on the individual wheels. To decide the unstable behavior, the controller computes the difference between the measured yaw rate and the reference yaw rate based on the 2 DOF vehicle model. In this study, we propose a reference vehicle model based on a lookup table to overcome the inaccuracy of the previous one. The proposed model describes the realistic vehicle behaviors on various driving situations so that the vehicle stability controller can actuate brake intervention and engine intervention in limit cornering situations.<br/>
위상 평면에서의 전복 에너지 해석을 통한 차량 전복 판단 및 제어기 설계
조영주(YoungJoo Cho),곽병학(ByungHak Kwak),최성호(SeongHo Choi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Because of an increasing popularity of the SUV and Light Truck with an elevated center of gravity, the rollover propensity is higher than before. This paper proposes a method to detect and prevent an impending rollover of the vehicle using Electronic Stability Control(ESC). The Rollover Prevention(ROP) function determines a rollover critical situations based on the rollover propensity index and generates a proper activation through a brake and engine intervention. The rollover propensity index is calculated from the relative distance of the trajectory to the threshold on the phase plane of roll-angle and roll-rate. The threshold on the phase plane is deduced from the conservation of energy in the roll model. For the detection and activation of continuous rollover phenomena, we use the TTL concept that presents a gradually increasing rollover propensity. The proposed algorithm in this paper is shown to be effective in mitigating a rollover through the simulation and vehicle test.
타이어 모델을 이용한 선회 모멘트의 최적 분배 제어 방법에 관한 연구
이신애(Shinae Lee),곽병학(ByungHak Kwak),최성호(SeongHo Choi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Vehicle stability control system can enhance the vehicle stability and handling in the emergency situation through the control of traction and braking forces at the individual wheels. To achieve the desired performance, we must exactly calculate compensated yaw moment, and control the wheel slip to generate braking force. But, the yaw moment is highly dependent on the status of tire dynamics at each wheel. In this study, we propose optimal yaw moment distribution controller based on tire model according to the normal forces, road condition, slip rate and slip angle to cope with nonlinear tire dynamics. The proposed controller for disturbing the desired tire slip rate makes use of both the tire nonlinear model and optimization technique. It minimizes the braking control force corresponding to the desired tire slip at each wheel. We show the feasibility and usefulness of the proposed controller under various driving conditions through computer simulations of nonlinear vehicle model.
차량 안정성 제어 시스템을 위한 게인 스케쥴링을 이용한 Wheel Slip 제어기 설계 및 적용
이신애(Shinae Lee),곽병학(Byunghak Kwak),조영주(Youngju Cho) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Vehicle stability control system can enhance the vehicle stability and handling in the emergency situations through the control of traction and braking forces at the individual wheels. To achieve the desired performance, the wheel slip controller manages the hydraulic braking system to generate the desired braking force at each wheel. In this study, we propose the wheel slip controller for the generation of the braking forces based on Gain scheduled PID control theory with Phase Plane. To overcome non-linear wheel dynamics and various road condition, the proposed controller make the slip ratio and the brake pressure the desired ones so that the vehicle stability controller can intervene braking force at each wheel. We show the validity and usefulness of the proposed controller under various driving conditions through the vehicle test.
칼만 필터를 이용한 Drive-by-wire 시스템을 가진 자동차에 대한 고장진단
류성필(Seongpil Ryu),정훈상(Hunsang Jeong),곽병학(Byunghak kwak),박영진(Youngjin Park) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
Drive-by-wire systems will become popular in the near future, because of their compactness, lightweight and improved controllability. Since there would be no mechanical redundancy in the drive by wire subsystem, the reliability of the system needs to be improved by using fault diagnosis of sensors and actuators.<br/> In the paper, a Kalman filter based fault diagnosis method for the vehicle with the drive by wire system, which includes steer by wire, brake by wire and throttle by wire systems, is proposed It is shown that the proposed method is successful in fault detection and isolation for single sensor/actuator fault of the vehicle system.
최성진(Sungjin Choi),박정원(Jungwon Park),전광기(Kwangki Jeon),최규재(Gyoojae Choi),곽병학(Byunghak Kwak),차항병(Hangbyong Cha) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Since the car is more large - size and is faster, the driver's demand of the vehicle stability at the extreme driving condition generated by sudden steering, road condition, unexpected interface, and so on increases more. To confirm vehicle stability and handling performance, ESP system is being utilized. In this paper, we test the vehicle in various test mode. and propose the evaluation method for ESP characteristics in the extreme driving situation. The proposed evaluation method for ESP in this paper is expected to facilitate to develop the control logic and improve the performance of ESP system.