http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
타이어 뉴메틱 트레일 정보를 활용한 횡방향 타이어 노면 마찰 계수에 관한 연구
한경석(Kyoungseok Han),최세범(Seibum Choi) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.3
The demands for vehicle safety systems such as ABS and ESC have been increased. Accurate vehicle state estimation is required to realized the abovementioned systems and tire-friction coefficient is crucial information. Estimation of lateral tire-road friction coefficient using pneumatic trail information is mainly dealt in this paper. Pneumatic trail shows unique characteristics according to the wheel side slip angle and these property is highly sensitive to vehicle lateral motion. The proposed algorithm minimizes the use of conventional tire models such as magic formula, brushed tire model and Dugoff tire model. The pure side slip maneuver, which means no longitudinal dynamics, is assumed to achieve the ultimate goal of this paper. A simulation verification using Carsim and Simulink is performed and the results show the feasibility of the proposed algorithms.
한경석(Kyoungseok Han) 한국자동차공학회 2020 한국 자동차공학회논문집 Vol.28 No.10
This paper proposes a hierarchical control scheme to solve the control problem of hybrid systems. In particular, the control variables of hybrid systems consisting of continuous and discrete variables have been decomposed in order to formulate the hierarchical structure. The proposed approach solves the decomposed problems separately, and then the solutions obtained are integrated to address the original hybrid system control problem. Compared to other conventional methods, our approach can significantly reduce the computational burden, which is the major contribution of this study. The proposed approach has been applied to the problem with gearshift and speed controls for autonomous electric vehicles, a typical control problem for a hybrid system. The gearshift and speed profiles are controlled using the short preview traffic information in order to optimize the battery energy consumption in the model predictive control framework. In addition, the performance and feasibility of the proposed algorithm has been verified by means of a simulation test over various driving conditions.
확장 칼만 필터를 이용한 자동변속기 차량의 구동토크 관측기 설계
한경석(Kyoungseok Han),최세범(Seibum Choi) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Ride quality of vehicles is very closely concerned with smooth clutch control and it has been improved by accurate estimation of clutch torque or output shaft torque. Unfortunately, Torque sensors or high precision encoders for rotating shafts are seldom used in production cars because of their costs, maintenances and installations. So, it is required to estimate drive shaft torque with accessible values such as wheel rotate speed, engine rotate speed. In this paper, Extended Kalman Filter(EKF) is used to estimate shaft torque because of applicable to nonlinear systems and characteristics of its robustness to model uncertainties. Well known driveline model was used to construct observers and then observers are validated with Carsim and Matlab/Simulink which is well known as a vehicle dynamic simulator.
전자식 사륜 구동 차량의 코너링 성능 향상을 위한 횡방향 거동 제어
한경석(Kyoungseok Han),박기서(Giseo Park) 한국자동차공학회 2020 한국 자동차공학회논문집 Vol.28 No.9
A lateral motion control to enhance the cornering performance of electronic-four-wheel drive(e-4WD) vehicles is introduced in this paper. The proposed controller aims to optimally provide the in-wheel motor(IWM) torques to each wheel assisting the vehicle in following the desired trajectories. It includes a yaw rate reference for neutral-steering, which leads to enhanced cornering performance. A smooth sliding mode controller(SMC) is utilized based on a bicycle model to generate the desired yaw moment. Lastly, a torque distribution method with the Daisy-chaining allocation is utilized within an available torque operation area of IWM. Using the CarSim software, the proposed control algorithm is simulated. The effectiveness of the proposed approach is evaluated using various driving scenarios. It is confirmed that some evaluation factors in cornering performance are improved.