• 제목/요약/키워드: braking power

검색결과 269건 처리시간 0.041초

능동 후륜조타와 요우 모멘트의 협조제어에 관한 연구 (A Study on Integrated Control System Design of Active Rear Wheel Steering and Yaw-Moment Control Systems)

  • 박중현;박재욱
    • 동력기계공학회지
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    • 제8권4호
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    • pp.57-63
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    • 2004
  • Conventionally, 2WS is used for vehicle steering, which can only steering front wheel. In case of trying to high speed lane change or cornering through this kind of vehicle equipped 2WS, it may occur much of Yaw moment. On the other hand, 4WS makes decreasing of Yawing Moment, outstandingly, so it is possible to support vehicle movement stable. And conventional ABS and TCS can only possible to control the longitudinal movement of braking equipment and drive which can only available to control of longitudinal direction. There after new braking system ESP was developed, which controls both of longitudinal and lateral, with adding of the function of controlling Active Yaw Moment. On this paper, we show about not only designing of improved braking and steering system through establishing of the integrated control system design of 4WS and ESP but also designing of the system contribute to precautious for advanced vehicle stability problem.

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중형 및 대형 EV 아키텍처를 위한 제동시스템 모듈러 설계 적용 방안에 관한 연구 (A Study on Application Method of Brake System Modular Design for Medium and Large EV Architecture)

  • 심재훈;황세라
    • 자동차안전학회지
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    • 제16권1호
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    • pp.21-28
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    • 2024
  • Many global car manufacturers in the world are recently developing a variety of electric vehicles in response to demanding market needs. Also, they have adapted the architecture method in order to develop electric vehicles effectively. It is because architecture method can produce various electric vehicles with high profitability. However, when electric vehicles are being developed, brake system has a lot of demanding tasks in relation to deciding specification of brake system because of heavy vehicle weight, narrow power electric room space and large volume of electric hydraulic booster. In this paper, a new approach is proposed for deciding the front and rear brake systems in order to design the brake system of electric vehicles effectively. To do this, we study correlations among vehicle weight, layout of power electric room and volume of electric hydraulic booster. And then, we also study combination of hydraulic braking and regenerative braking which is widely applied to electric vehicles. Finally, we want to contribute to build up modular design of brake system for architecture of electric vehicles through these studies.

도시철도 변전소 회생전력 분석에 관한 연구 - 서울도시철도 전력공급소 전력분석을 중심으로 - (Analysis of regenerative power substations, railway)

  • 이준상;박종헌;서석철;김진영;김기춘
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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    • pp.3117-3123
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    • 2011
  • 도시철도의 전동차는 변전설비로부터 전력을 공급받아 지상, 지하부의 다양한 선로조건(구배)를 지닌 선로를 운행하며, 열차 제동 시 많은 회생전력이 발생하고 있다. 회생제동은 에너지를 재활용 할 뿐만 아니라 기계식 브레이크의 사용을 줄이는 매우 이상적인 시스템이라고 할 수 있다. 또한 중요한 점은 회생제동이 가능한 시스템은 발생된 에너지가 어떤 정해진 흐름을 가지고 소모되고 재활용 가능하다는 것이다. 본 연구에서는 서울도시철도 전력공급소(변전소)의 전동차용 전력의 정밀분석을 실시하였다. 이를 통하여 변전소 전력공급과 전동차 전력사용의 데이터 분석을 통하여 회생전력 활용 연구의 기반작업을 수행하였다.

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Development of a Novel Charging Algorithm for On-board ESS in DC Train through Weight Modification

  • Jung, Byungdoo;Kim, Hyun;Kang, Heechan;Lee, Hansang
    • Journal of Electrical Engineering and Technology
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    • 제9권6호
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    • pp.1795-1804
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    • 2014
  • Owing to the reduction in the peak power of a DC railway subsystem, many studies on energy storage system (ESS) applications have received attention. Each application focuses on improving the efficiency and addressing regulation issues by utilizing the huge regenerative energy generated by braking-phase vehicles. The ESS applications are widely divided into installation on a vehicle or in a substation, depending on the target system characteristics. As the main purpose of the ESS application is to reduce the peak power of starting-phase vehicles, an optimized ESS utilization can be achieved by the operating at the highest peak power section. However, the weight of an entire vehicle, including those of the passengers, continuously changes during operation; thus, considering the total power consumption and the discharging point is difficult. As a contribution to the various storage device algorithms, this study deals with ESS on board vehicles and introduces an ESS operating plan for peak-power reduction by investigating the weight of a train on a real-time basis. This process is performed using a train-performance simulator, and the simulation accuracy can be increased because the weight in each phase can be adopted in the simulation.

웨지 구조를 이용한 전기기계브레이크 시스템 연구 (Study of EMB System Using Wedge Structure)

  • 신동환;권오석;배준형
    • 한국자동차공학회논문집
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    • 제18권3호
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    • pp.8-18
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    • 2010
  • According to the needs of change to hybrid, fuel cell and electric vehicle, and to the increasing demand for safety and eco-friendliness, the necessity of Electro-Mechanical Brake(EMB) is being increased. But, one of the most important problems for realizing EMB to the practical use is that the required motor power for braking is too high. So the high braking efficient EMB is required. In recent years, the Electronic Wedge Brake(EWB) is noticeable for the high braking efficiency. In this research, we examine the improvable matter of the recent published EWB, and we propose the improved mechanism and the cost effective control method using this mechanism. And we test these feasibility by experiment and discuss these meaning and effect.

Modified Anti-windup PI 제어기와 Braking Mode를 이용한 SRM의 속도제어 (Speed Control of Switched Reluctance Motor using Modified Anti-Windup PI Controller and Braking Mode)

  • 김재문;윤용호;장수진;원충연;김영렬
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2004년도 전력전자학술대회 논문집(2)
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    • pp.954-958
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    • 2004
  • 본 논문은 부하에 대한 빠른 응답특성을 보이는 새로운 토폴로지를 제안하였다. PI제어기 출력이 포화될 때 windup 현상이 나타나고 그 결과로 성능이 저하된다. 따라서 전동기의 가변속 제어성능을 위해 가속시에는 개선된 Anti-windup PI제어기만을 사용하고, 감속시에는 추가로 부하의 특성을 고려하여 braking 동작을 사용하였다. 시뮬레이션 및 실험결과는 속도성능면에서 제안된 방식이 종래의 다른 제어방식에 비해 우수함을 보여 준다.

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디스크 브레이크 저더 개선을 위한 신뢰성 향상 연구

  • 정원선;이창수;송현석;정도현
    • 한국신뢰성학회:학술대회논문집
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    • 한국신뢰성학회 2011년도 춘계학술발표대회 논문집
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    • pp.99-106
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    • 2011
  • In this study, the analysis technique, which can estimate the temperature rise and thermal deformation of the ventilated disc considering the vehicle information, braking condition and properties of the disc and pad, is developed. The analytical process of the braking power generation during braking is mathematically derived. The thermal energy, which is applied to the surface of a disc as heat flux, is calculated. Then, the temperature rise and thermal deformation of a disc are estimated using FE software, SAMCEF. Shape of the cross section of the disc is optimized according to the response surface analysis method in order to minimize the temperature rise and thermal deformation. The hot judder analysis is done using the optimized disc, and the analysis results are discussed.

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전(全)방향 충돌 회피를 위한 액츄에이터 최적 분배 알고리즘 (Unified Control of Independent Braking and Steering Using Optimal Control Allocation Methods for Collision Avoidance)

  • 김규원;김범준;이경수
    • 자동차안전학회지
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    • 제5권2호
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    • pp.11-16
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    • 2013
  • This paper presents a unified control algorithm of independent braking and steering for collision avoidance. The desired motion of the vehicle in the yaw plane is determined using the probabilistic risk assessment method based on target state estimation. For the purpose of coordinating the independent braking and steering, a non-linear vehicle model has been developed, which describes the vehicle dynamics in the yaw plane in both linear and extended non-linear ranges of handling. A control allocation algorithm determines the control inputs that minimize the difference between the desired and actual vehicle motions, while satisfying all actuator constraints. The performance of the proposed control algorithm has been investigated via computer simulations conducted using the vehicle dynamics software CARSIM and Matlab/Simulink.

디스크 브레이크 허브 볼트의 억지 끼워 맞춤에서 발생하는 소성변형의 해석 (An analysis of plastic deformation occurring by interference fit of disk brake hub bolt)

  • 이요셉;곽시영;강신일
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2008년도 춘계학술대회 논문집
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    • pp.238-241
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    • 2008
  • A brake system in automobile is one of the important parts that directly affect the safety of passengers. Particularly, disk brake module is applied to almost all kinds of automobile brake system due to its remarkable braking power and braking distance. In the disk brake module of an automobile, the bolt for tire wheel is assembled to the disk brake hub by interference fit (bolt pressing process). The process induces small deformation whose range is within tens of ${\mu}m$ and this deformation may cause the runout badness of the whole disk brake module, and even braking problems such as judder or squeal phenomena which makes the loss of braking efficiency. In this study, bolt pressing fit into hub was simulated by $ANSYS^{TM}$, a commercial structure analysis program. Also, the aspect and the cause of hub displacement were analyzed and the solution for decreasing runout of hub was proposed.

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Position Sensorless Control of PMSM Drive for Electro-Hydraulic Brake Systems

  • Yoo, Seungjin;Son, Yeongrack;Ha, Jung-Ik;Park, Cheol-Gyu;You, Seung-Han
    • 드라이브 ㆍ 컨트롤
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    • 제16권3호
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    • pp.23-32
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    • 2019
  • This study proposed a fault tolerant control algorithm for electro-hydraulic brake systems where permanent magnet synchronous motor (PMSM) drive is adopted to boost the braking pressure. To cope with motor position sensor faults in the PMSM drive, a braking pressure controller based on an open-loop speed control method for the PMSM was proposed. The magnitude of the current vector was determined from the target braking pressure, and motor rotational speed was derived from the pressure control error to build up the braking pressure. The position offset of the pump piston resulting from a leak in the hydraulic system is also compensated for using the open-loop speed control by moving the piston backward until it is blocked at the end of stroke position. The performance and stability of the proposed controller were experimentally verified. According to the results, the control algorithm can be utilized as an effective means of degraded control for electro-hydraulic brake systems in the case that a motor position sensor fault occurs.