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통합제어를 이용한 Split_μ 노면에서의 제동 시 차량의 거동안정성 향상을 위한 연구
정지현(Jihyun Jung),윤상호(SangHo Yoon),구본경(BonGyeong Koo),김동신(Dongshin Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Purpose of this study is to improve yaw stability of the vehicle while braking on the split_μ road with UCC that is consist of ESC and EPS. ESC system needs the additional control logic to calculate Steering Assist Torque using the estimated wheel pressures and measured yaw rate. And then, ESC system communicates the Steering Assist Torque to EPS system by CAN. When EPS system receives this value, it turns front wheels forward low_μ surface. It is ultimately to enhance yaw stability of the vehicle. For this reason, it is possible that vehicles go straight while braking on the split_μ road. Winter Test in China is performed to acquire the real car test results on the split_μ road that is made of ice and dry asphalt road. In this paper, the structure of UCC control logic and the test results of UCC system for yaw stability of the vehicle while braking on the split_μ road are shown.
ESC와 EPS의 통합 제어를 통한 차량의 안전성 향상
이안나(AhnNa Lee),정지현(JiHyun Jung),구본경(BonGyeong Koo),차항병(HangByoung Cha) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The usage of electronically controlled systems is recently is in the trend of increase. Electronically controlled systems for the vehicle are communicated through the network as CAN(Control Area Network). By sharing sensor and processing signals through the network between individual electronic systems, Unified Chassis Control can be developed. This paper presents Unified Chassis Control of Electronic Stability Control (ESC) and Electric Power Steering (EPS). ESC calculates appropriate steering assist torque for maintaining and improving vehicle stability and steerability. Calculated steering assist torque is transferred into EPS via CAN. The vehicle is maintained stable and controllable so as to generates steering assist torque by electric motor of EPS under the control of ESC. Therefore driver maneuverability is improved. We demonstrated that Unified Chassis Control improve vehicle stability by vehicle test which is braking on Split-μ roads.
실시간 주행 시뮬레이터를 이용한 통합섀시제어기의 성능 검증
윤장열(Jangyeol Yoon),조완기(Wanki Cho),임성진(Seongjin Yim),이경수(Kyongsu Yi),구본경(Bongyeong Koo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper presents human-in-the-loop evaluations of unified chassis control (UCC) system using a full-scale driving simulator based on a virtual test track (VTT). The UCC system which is designed in this study aims for the prevention of vehicle rollover and the improvement of vehicle stability such as maneuverability and lateral stability by integrating electronic stability control (ESC) and active front steering (AFS). The UCC system always works with the driver, the overall vehicle performance is depend not only on how well the controller works but also on its interaction with the human driver. Vehicle behavior and interactions among the vehicle, the UCC controller and the human driver are investigated using a driving simulator. Closed-loop simulation results at realistic driving situations have shown that the proposed UCC system prevents vehicle rollover and at the same time ensuring the vehicle stability, and reduces driving effort of a driver in extreme driving situations.
Electro-Wedge Brake의 고장 분류 및 센서 고장 진단
황우현(Woohyun Hwang),허건수(Kunsoo Huh),김명준(Myoungjune Kim),김주곤(Joogon Kim),구본경(Bongyeong Koo) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The brake-by-wire units such as EWB (Electro-Wedge Brake) will be used to the next-generation intelligent vehicles because the EWB units are lighter in weights and have faster response compared to conventional hydraulic brake units. EWB unit uses the self-reinforcing wedge principle, the actuation forces and therefore electrical power requirements are much lower than in conventional electromechanical brake system. However, when implementing to the vehicle, the important problem is the reliability of the brake-by-wire units. Because there are no mechanical links between the brake pedal and brakeby-wire actuators, Fault diagnosis is essential in implementing EWB units. In this study, EWB fault diagnosis system is developed for monitoring the brake status based on the analytical redundancy method. A test bench is built including the EWB system and the performance of the proposed fault diagnosis system is demonstrated through the test bench experiment.
EMB의 Closed-Loop 시스템을 위한 모델기반 고장검출 알고리즘 개발
황우현(Woohyun Hwang),허건수(Kunsoo Huh),김명준(Myoungjune Kim),김주곤(Joogon Kim),구본경(Bongyeong Koo) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Faults in dynamic systems refer to unintended and unplanned deviations from the acceptable system behavior due to changes in system parameters or other reasons. The importance of the fault detections and isolation the faults are unavoidable especially when we are working with EMB systems. This paper presents a method to detect the sensor faults in the EMB closed-loop control systems by introducing the model-based approach. The paper first describes the EMB model for Clamping brake force and then EMB fault detection algorithm is developed for sensor faults based on the analytic redundancy method. The performance of the proposed model-based fault diagnosis system is verified in simulations in various faulty cases.
그린카용 Brake-by-Wire 시스템의 ECU 개발
김주곤(JooGon Kim),김명준(MyoungJune Kim),전재형(JaeHyung Chun),구본경(BonGyeong Koo),허재호(Jaeho Hur),손영창(YC Son) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
New ECU’s of EMB/EWB system which can be used for ABS/ESC/EPB controller are proposed in this paper. The proposed ECU’s can be applied in the rear wheel control actuator of both HBS System and BbW System. The proposed drive ECU is a new electronic braking controller for the sake of vehicle stability using BLAC motor and the developed central ECU is a new electronic central braking controller of HBS System or BbW System. To show the results of the proposed ECU’s, various kinds of vehicle tests were accomplished. From this research, we have obtained core technologies to develop both the drive ECU of front/rear EMB system and the central ECU which can be applied to BBW system in advanced vehicles such as hybrid vehicles, fuel cell vehicles, and electrical vehicles.
Fault Tree Analysis를 통한 EMB 고장의 분류 및 EMB의 고장 검출 알고리즘 개발
김인근(Inkeun Kim),한광진(Kwangjin Han),허건수(Kunsoo Huh),김명준(Myoungjune Kim),김주곤(Joogon Kim),구본경(Bongyeong Koo) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Barke-by-Wire systems are lighter in weight, faster in response, easier to implement than the conventional brake systems. Because brake systems are directly related to passengers’ life, guarantee of system’s robustness are essential for implementation. In order to ensure the reliability of the Electro-Mechanical Brake(EMB), a robust dry-type BBW controller should be designed. In this study, a fault detection algorithm is designed based on classified faults. Fault Tree Analysis is used to show how the faults are occurred and how their causes are related to the basic events. In order to detect the rotor faults, magnetic flux leakage are estimated using the estimation algorithm. By choosing a proper threshold, it is shown that rotor fault can be detected.