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편경사 도로에서의 차량 안정성 제어를 위한 차등제동 분배
정태영(Taeyoung Chung),한동훈(Donghoon Han),이경수(Kyongsu Yi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A detection or estimation of bank angle was investigated by many researchers to hold the vehicle stability controller or to ensure the robustness of the lateral velocity estimator. Furthermore, the controller which utilizes lateral velocity estimate can be designed by considering the bank angle effects. Since a driver could not recognize the bank angle effect, he or she steers in the same way either driving on a road with or without bank angle in critical driving situation. With bank angle estimator, the vehicle stability control logic and its desired values are modified to compensate the bank angle effects. To investigate the driver’s reaction on obstacle avoidance maneuver, the Human-in-the-loop evaluation is applied by using driving simulator. By using the modified VSC logic, the driver reacts similarly on both banked road and flat road in the same emergency driving situation. Therefore the proposed control logic is said to be preventing a driver from misjudgment on a bank road.
3자유도 차량모델 기반 차량 안정성 제어 알고리듬 설계
정태영(Taeyoung Chung),이경수(Kyoungsu Yi) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.1
This paper presents vehicle stability control algorithm based on 3-DOF vehicle model. The brake control inputs have been directly derived from the sliding control law based on a three degree of freedom plane vehicle model with differential braking. The simulation has performed using a full nonlinear 3-dimensional vehicle model and the performance of the controller has been compared to that of a direct yaw moment controller. Simulation results show that the proposed controller can provide a vehicle with better performance than conventional controller with respect to brake actuation without compromising stability at critical driving conditions.
차량 횡방향 속도 추정기 및 노면 편경사 각도 추정기의 성능 검증
정태영(Taeyoung Chung),민경찬(Kyongchan Min),이경수(Kyongsu Yi) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The estimation of vehicle lateral velocity is essential to development of integrated vehicle dynamic control system. A conventional vehicle stability control system contains yawrate sensor and lateral acceleration sensor, and both sensors are affected by bank angle directly. By using existing vehicle sensors, we validate various bank angle estimators and vehicle lateral velocity estimators via vehicle test.
정태영(Taeyoung Chung),김두형(Duhyung Kim),양승훈(Seung-Hoon Yang) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In the case of a full-braking on a split-mu road, the ABS (Anti-lock Brake System) controller should make a compromise between a braking performance and a lateral stability of the vehicle. It depends on vehicle characteristics of lateral behavior and the needs of a vehicle designer. By adding steering torque properly, ESC (Electronic Stability Control) and MDPS (Motor Driven Power Steering) integrated control system makes a driver steer to the right direction, and even reduces braking distance. Although the system does not improve vehicle behavior directly, it can inspire drivers to steer to the right direction by changing steering torque assistance characteristics. The test results show that the proposed system assists a driver well to keep the lane, improves braking performance, and ensures hands-off stability on the split-mu full braking.
주행 시뮬레이터를 이용한 차량 안정성 제어기의 성능 검증
정태영(Taeyoung Chung),이건복(Gunbok Lee),이경수(Kyongsu Yi) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.4
This paper presents human-in-the-loop evaluations of vehicle stability control(VSC) system using a driving simulator. A driving simulator which contains full vehicle nonlinear model is evaluated by using actual vehicle test data on the same driving conditions. Braking control inputs for Vehicle Stability Control system have been directly derived from the sliding control law based on vehicle planar motion equations with differential braking. Closed-loop simulation results at realistic driving situations have shown that the proposed controller reduces driving effort of a driver and enhances stabilitv of a vehicle.
Estimation of Cost of Energy for Offshore Wind Turbines
정태영(Chung, Taeyoung),문석준(Moon, Seokjun),이한민(Lee, Hanmin),임채환(Rim, Chaewhan) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Large offshore wind farms have actively been developed in order to meet the needs for wind energy since the land-based wind farms have almost been fully developed especially in Europe. The key problem for the construction of offshore wind farms may be on the high cost of energy compared to land-based ones. NREL (National Renewable Energy Laboratory) has developed a spreadsheet-based tool to estimate the cost of wind-generated electricity from both land-based and offshore wind turbines. Component formulas for various kinds and scales of wind turbines were made using available field data. Annual energy production has been estimated based on the Weibull probability distributions of wind. In this paper, this NREL estimation model is introduced and applied to the offshore wind turbines now under designing or in production in Korea, and the result is discussed.
정태영(Taeyoung Chung),이경수(Kyongsu Yi) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.5
In conventional Vehicle Stability Control (VSC) System, a control threshold is designed by average driver characteristics. Despite the stabilizing effort, VSC causes redundancy to an expert driver. An advanced VSC which has flexibility on its control property is proposed in this study. By using lateral velocity estimator, a control threshold is determined on side slip angle and angular velocity phase plane. Vehicle planar motion model based sliding controller is modified with respect to various control thresholds. The performance of the proposed VSC algorithm has been investigated by human-in-the-loop simulation using a vehicle simulator. The simulation results show that the control threshold has to be determined with respect to the driver steering characteristics. A VSC with variable control thresholds would provide an improvement compared to a VSC with a constant threshold.
정태영(TaeYoung Chung),송관웅(KwanWoong Song),김창수(Chang-Su Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
We investigate error patterns in compressed multi-view videos and propose a multi-hypothesis algorithm, which is adaptive to the error patterns. Different from multi-hypothesis algorithms for mono-view sequences, the proposed algorithm exploits inter-view correlations in multi-view sequences as well as spatio-ternporal correlations. Simulation results demonstrate that the proposed algorithm effectively protects the quality of reconstructed videos against transmission errors.
정태영(Taeyoung Chung),이건복(Gunbok Lee),이경수(Kyoungsu Yi) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.1
In this paper, validation of Driver Steering Model has been conducted. The comparison between the simulation model and vehicle test results shows that the model is very feasible for describing combined human driver and actual vehicle dynamic behaviors. The 3D vehicle model is consisted of 6-DOF sprung mass and 4-quarter car model for vehicle body dynamics. Powertrain model including differential gear and Pacejka tire model ale applied. The driver steering model is also validated with vehicle test result. The driver steering model is based on angle and displacement error the desired path, recognized by driver.
Human-in-the-loop 시스템을 이용한 차량 안정성 제어기 성능검증
정태영(Taeyoung Chung),이경수(Kyongsu Yi) 한국자동차공학회 2003 한국자동차공학회 Symposium Vol.2003 No.9
This paper presents Human-in-the-Ioop evaluations of Vehicle Stability Control(VSC) system using a driving simulator. Human driver-VSC interactions have been investigated under realistic operating conditions in the laboratory. Braking control inputs for vehicle stability enhancement have been directly derived from the sliding control law based on vehicle planar motion equations with differential braking. A driving simulator is consists of a three-dimensional vehicle dynamic model. interface between human driver and vehicle simulator, three-dimensional animation program. Closed-loop simulation results at realistic driving situations have shown that the proposed controller reduces driving effort of a driver and enhances stability of a vehicle. The simulation-based closed-loop evaluation method is a useful tool in assessing the performance of VSC systems interacting with human drivers over a range