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유승진(Seungjin Yoo),유승한(Seung-Han You),김두형(Duhyung Kim),이교일(Kyo Il Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
We investigate an optimal integrated control of the vehicle equipped with active steering system and independent braking system. The proposed controller uses DYC(Direct Yaw moment Control) and active 4WS(4 wheel steering) simultaneously to improve the handling and stability of vehicle. A model following robust controller that specifies the required yaw moment and total lateral tire force is designed though LMI(Linear Matrix Inequality) formulation. To generate the target steer angles and reference brake pressures in each 4 wheel, the control allocation method is synthesized via quadratic programming. Simulation results show that the proposed integrated controller enhances the stability and handling of vehicle effectively in several driving maneuvers.
차량의 전복 방지 및 조향 안정성 향상을 위한 VDC 시스템의 제어기 개발
유승진(Seungjin Yoo),조준상(Joon-Sang Jo),유승한(Seung-Han You),이교일(Kyo Il Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the design of modularized controller for the VDC(Vehicle Dynamics Control). With this design scheme, the controller can be decomposed in the following two parts : vehicle dynamics controller and brake pressure controller. For vehicle dynamics controller, sliding mode controllers are designed that are activated in the order of priority to prevent rollover, excessive body sideslip angle, as well as understeer/oversteer of the vehicle. While, the brake pressure controller is designed to make brake pressures in each wheel track the desired pressures calculated in the vehicle dynamics controller. A feedback controller as well as a brake pressure estimator is designed based on the developed mathematical model for VDC hydraulic system. The results of the HILS(Hardware In the Loop Simulation) show that the roll angle, body sideslip angle and yaw rate responses of the vehicle are improved in the several driving scenarios.
조중석 ( Jungseok Cho ),유승진 ( Seungjin You ),정유진 ( Yoojin Jeong ),김진주 ( Jinzoo Kim ),남제원 ( Jaewon Nam ),조두산 ( Doosan Cho ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
전기전자, 정보통신 둥 디지털/정보화 시대를 주도하는 산업의 핵심제품으로 혁신적 방식으로 기존의 전기신호처리 및 정보기억 기능을 대체할 새로운 메모리 반도체 개발기술이 요구되고 있다. 반도체 소자를 이용하여 디지털 정보를 기억하는 소자 가운데 기존의 DRAM과 플래시 메모리를 발전시켜 새로운 물질이나 구조를 사용하는 반도체 정보기억 소자 개발 기술이 필요하다.
유승한(Seung-Han You),조준상(Joon-Sang Jo),유승진(Seungjin Yoo),한진오(Jin-Oh Hahn),이교일(Kyo Il Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This paper deals with the design of a feedback yaw rate controller based on gain-scheduled H∞ optimal control, which enables the reduction of sideslip as well as the prevention of vehicle rollover. The uncertain factors such as vehicle mass and cornering stiffness in the vehicle yaw rate dynamics naturally call for the robustness of the feedback controller, which leads to the application of H." optimization technique to synthesize a controller with guaranteed robust stability and performance against the model uncertainty. The lumped disturbance due to the parametric uncertainties is estimated using the disturbance observer to assess the correct value of the compensating yaw moment. The braking force distribution for generating artificial yaw moment is implemented by effective actuation of braking wheels. Simulation results indicate that the proposed gain-scheduled H∞ optimal yaw rate controller can decently improve the lateral stability of an automobile.
유승한(Seung-Han You),유승진(Seungjin Yoo),한진오(Jin-Oh Hahn),이교일(Kyo Il Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This paper presents new approaches to identify vehicle lateral velocity and road-bank angle in real-time. The main challenge in the identification of lateral velocity and road-bank angle is that they are lumped together with the disturbance induced by system parametric uncertainties such as variations of vehicle mass and cornering stiffness of tires. This paper develops two estimation algorithms using the parameterized model for the identification of parametric uncertainties, which enables the real-time estimation of vehicle lateral velocity and road-bank angle via algebraic formulation. The decent performance of the proposed estimation methods is verified using simulation results on CARSIM, proving their practicability in real-world applications.