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한진오(Jin-Oh Hahn),이교일(Kyo Il Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This paper presents an adaptive approach to control the amount of slip of the torque converter bypass clutch using its estimated friction coefficient. The proposed approach can be readily implemented using the inexpensive speed sensors currently installed in an automobile. A measurement feedback control law to drive the slip error to zero together with an adaptation law to identify the unknown friction coefficient is developed using the Lyapunov control design method. The robustness of the control and adaptation laws to parametric and/or torque uncertainties as well as the convergence of the friction coefficient are investigated. Simulation results verify the viability of the proposed control algorithm in real-world vehicle control applications.
Differential GPS에 기초한 도로 뱅크각의 실시간 추정기법
한진오(Jin-Oh Hahn),Rajesh Rajamani(Rajesh Rajamani),유승한(Seung-Han You),이교일(Kyo II Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
This paper presents a novel approach to estimate the road bank angle using a disturbance observer. The disturbance observer estimates the lumped disturbances, which include the effects of the system parametric uncertainty and the road bank angle. Based on the estimated disturbances, the amonut of disturbance caused by the system parametric variations is identified using an adaptive gradient law with a projection algorithm. With the system variations identified, the value of road bank angle is extracted ITom the estimated disturbance provided by the disturbance observer. The performance and accuracy of the proposed road bank angle estimation algorithm is verified by numerical and experimental results.
Modeling and H<SUB>∞</SUB> Optimal Control Design for a Hydraulic Unit in ES
Seung-Han You(유승한),Jin-Oh Hahn(한진오),Young Man Cho(조영만),Kyo Il Lee(이교일) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This paper deals with feedback control of a hydraulic unit for direct yaw moment control, a method used to actively maintain the dynamic stability of an automobile. The uncertain parameters and complex structure naturally call for empirical modeling of the hydraulic unit, which readily results in a control-oriented model with high fidelity. The identified model is cross-validated against experimental data under various conditions, which helps to establish model uncertainty. Then, the H<SUB>∞</SUB> optimization technique is employed to synthesize a controller with guaranteed robust stability and performance against the model uncertainty. The performance of the synthesized controller is verified using experimental results, which shows the viability of the proposed approach in a real-world application.
유승한(Seung Han You),한진오(Jin Oh Hahn),이교일(Kyo Il Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
Nowadays, in spite of some defects in high cost and low power transmission efficiency, most automobiles are equipped with automatic transmissions for shifting gears for the reason of convenience. Recently, one of the important thing in designing shift controller is about shift quality in the meaning of reducing shock at shift. Namely, that is the problem how to minimize inevitable shift shock through suitable pressure control in friction element as clutch and brake. Another one is about the slip control of torque converter clutch. That is also achieved through suitable pressure control of damper clutch system. The automatic transmission hydraulic system that consists of many valves with high order and shows a lot different dynamics to temperature variation. so it is difficult to predict exact generated pressure in real time. In this paper, through the identification of automatic transmission hydraulic system, the real-time operable and exactly predictable hydraulic model of ARX, neural network, neuro-fuzzy type is proposed and validated. We confirm that neuro-fuzzy model has better performance than the others in the aspect of low prediction error, few input number and simple structure.<br/> <br/> <br/>
유승한(Seung-Han You),한진오(Jin-Oh Hahn),조영만(Young Man Cho),이교일(Kyo Il Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with the feedback control problem for a hydraulic unit in ESP, a device used to actively maintain the dynamic stability of an automobile. Firs~ owing to many unknown parameters and complex nature of the physi-cally derived model for the hydraulic unit~ a control-oriented model of the hydraulic unit is empirically developed to achieve model simplicity as well as ensure high fidelity. Then an observer-based integral control approach is em-ployed to guarantee perfect tracking in the presence of model uncertainty induced by such factors as oil temperature variation. Accuracy of the developed model and the performance of the integral controller are investigated using experimental results.<br/>
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.
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.