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홍대건(Daegun Hong),허건수(Kunsoo Huh),황인용(Inyong Hwang),선우명호(Myoungho Sunwoo) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.4
The wheel slip control systems are able to control the braking force more accurately and can be adapted to different vehicles more easily than conventional braking control systems. In order to achieve the superior braking performance through the wheel slip control, real-time information such as the tire braking force at each wheel is required. In addition, the optimal target slip values need to be determined depending on the braking objectives such as minimum braking distance, stability enhancement, etc. In this paper, a wheel slip control system is developed for maintaining the vehicle stability based on the braking monitor, wheel slip controller and optimal target slip assignment algorithm. The braking monitor estimates the tire braking force, lateral tire force and brake disk-pad friction coefficient utilizing the extended Kalman filter. The wheel slip controller is designed based on the sliding mode control method. The target slip assignment algorithm is proposed to maintain the vehicle stability based on the direct yaw moment controller and fuzzy logic. The performance of the proposed wheel slip control system is verified in simulations and demonstrates the effectiveness of the wheel slip control in various road conditions.
홍대건(Daegun Hong),윤팔주(Paljoo Yoon),강형진(Hyung-Jin Kang),황인용(Inyong Hwang),허건수(Kunsoo Huh) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, wheel slip controllers with controlling the wheel slip directly has been studied using the brake-by-wire actuator. The wheel slip controller is able to control the braking force more accurately and can be adapted to various different vehicles more easily than the conventional ABS systems. The wheel slip controller requires the information about the tire braking force in order to achieve the control performance. In this paper, the tire braking forces are estimated considering the variation of the friction between brake pad and disk due to aging of the brake, moisture on the contact area or heating, and the robust wheel slip controller is designed using sliding mode control based on the estimated tire braking force. The performance of the proposed control system is evaluated in various simulations.
홍대건(Daegun Hong),윤팔주(Paljoo Yoon),강형진(Hyung-Jin Kang),황인용(Inyong Hwang),허건수(Kunsoo Huh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
The wheel slip control systems are able to control the braking force more accurately and can be adapted to different vehicles more easily than conventional braking control systems. In order to achieve the superior braking performance through the wheel slip control, real-time information such as the tire braking force at each wheel is required. In addition, the optimal target slip values need to be determined depending on the braking objectives such as minimum braking distance, stability enhancement, etc. In this paper, a wheel slip control system is developed for maintaining the vehicle stability based on the braking monitor, wheel slip controller and optimal target slip assignment algorithm. The braking monitor estimates the tire braking force, lateral tire force and brake disk-pad friction coefficient utilizing the extended Kalman filter. The wheel slip controller is designed based on the sliding mode control method. The target slip assignment algorithm is proposed to maintain the vehicle stability based on the direct yaw moment controller and fuzzy logic. The performance of the proposed wheel slip control system is verified in simulations and demonstrates the effectiveness of the wheel slip control in various road conditions.
Phase Plane상의 안정경계 및 횡력 포화경계를 이용한 차량 안정성 해석
홍대건(Daegun Hong),허건수(Kunsoo Huh),박장현(Jahng-hyon Park),조동일(Dong-il Cho) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is known that the instability of a vehicle is caused by nonlinear characteristics of a tire and depends heavily on the rear tire force saturation. In this paper, the vehicle stability is analyzed using this phase plane method and this analysis is expanded to the 3-dimension including the steering angle. As a result, the 3-D stable boundary is constructed with respect to side slip angle, rate of side slip angle and steering angle. In the lane change maneuvers of a vehicle, the stable margin is monitored by comparing the trajectory of vehicle's side slip angle and steering angle with the 3-D stable boundary. This stable margin can be utilized as an index in order to estimate a vehicles' stability. Also, the lateral tire force saturation is analyzed and the saturation boundary is determined in the phase plane. It is confirmed that this saturation boundary is located inside of the stable boundary and the non-saturation region of the lateral tire force is smaller than the vehicle stable region.
적응 슬라이딩 제어 기반의 휠 스립 제어를 이용한 최대 제동력 제어
홍대건(Daegun Hong),허건수(Kunsoo Huh),강형진(Hyung-Jin Kang),윤팔주(Paljoo Yoon),황인용(Inyong Hwang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
The wheel slip control systems are able to control the braking force more accurately and can be adapted to different vehicles more easily than conventional ABS systems. In order to achieve the superior braking performance through the wheel-slip control, real-time information such as the tire braking force at each wheel is required. In addition, the optimal target slip values need to be determined depending on the braking objectives such as minimum braking distance, stability enhancement, etc. In this paper, for a monitoring the braking force, a robust wheel slip controller is developed based on the adaptive sliding control method and an optimal target slip determination algorithm. The controller determines the required pressure in the EHB(Electro-Hydraulic Brake) master cylinder to maintain the target wheel slip ratio during braking. The performance of the proposed wheel-slip control system is verified in simulations.
홍대건(Daegun Hong),박범찬(Bumchan Park),허건수(Kunsoo Huh),박장현(Jahng-hyon Park),조동일(Dong-il Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
The lane departure avoidance systems have been considered promising to assist human drivers in AVCS (Advanced Vehicle Control System). In this paper, a lane departure monitoring and control system is developed and evaluated in the hardware-in-the-loop simulations. This system consists of lane sensing, lane departure monitoring and active steering control subsystems. The road image is obtained based on a vision sensor and the lane parameters are estimated using image processing and Kalman Filter technique. The active steering controller for avoiding the lane departure is designed based on the lane departure metric. The proposed lane departure avoidance system is realized in a steering HILS (hardware-in-the-loop simulation) tool and its performance is evaluated with a driver in the loop.
홍대건(Daegun Hong),허건수(Kunsoo Huh),윤팔주(Paljoo Yoon),황인용(Inyong Hwang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, wheel slip controllers with controlling the wheel slip directly has been studied using the brake-by-wire actuator. The wheel slip controller is able to control the braking force more accurately and can be adapted to various different vehicles more easily than the conventional ABS systems. The wheel slip controller requires the information about the tire braking force and road condition in order to achieve the control performance. In this paper, the tire braking forces are estimated considering the variation of the friction between brake pad and disk due to aging of the brake, moisture on the contact area or heating. In addition the road friction coefficient is estimated without using tire models. The estimated performance of tire braking forces and the road friction coefficient is evaluated in simulations.
조영하(Youngha Cho),홍대건(Daegun Hong),윤팔주(Paljoo Yoon) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper proposes an urban BSD system using ultrasonic sensor, which is installed at both lateral sides of the vehicle. The sensor's detection range is about 5m and angular coverage is about 25°. The sensor monitors the overtaking vehicles in BSA. Due to the sensor's characteristic, it can only detect low and medium speed vehicle, But compared with other sensors like camera, SRR, laser radar, The cost is very cheap. So. the system has competitiveness in urban traffic condition whose maximum vehicle speed is 80Km/h, In this paper, we evaluate the feasibility of urban BSD using ultrasonic sensor.