• Title/Summary/Keyword: braking mode

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A Study on the Thermal Behavior Characteristic of Drum Brake considering Braking Patterns (제동 패턴을 고려한 드럼 브레이크의 열적 거동 특성에 대한 연구)

  • Lee, Kye-Sub;Son, Sung-Soo;Yang, Ki-Hyun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.5
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    • pp.145-154
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    • 2006
  • Each part of drum brake system is loaded by continual mechanical force and thermal force every time of braking, so enough strength and stability are required. Thermal characteristic is one of the important factors in drum brake systems design. This paper presents the thermal performance such as temperature distribution and thermal contact stress of drum brake system considering several braking patterns; 80th heat braking test mode, heat fade braking test mode, general road mode, steep slope road mode and off road mode. Transient heat transfer analysis and Thermo elastic contact analysis is executed to obtain the temperature distribution, and to evaluate thermal stress of drum brake by using ABAQUS/Standard code. This procedure of analysis can effectively be used to improve the quality problem of brake system and to get design guideline of the new product.

MAXIMUM BRAKING FORCE CONTROL UTILIZING THE ESTIMATED BRAKING FORCE

  • Hong, D.;Hwang, I.;SunWoo, M.;Huh, K.
    • International Journal of Automotive Technology
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    • v.8 no.2
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    • pp.211-217
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    • 2007
  • The wheel slip control systems are able to control the braking force more accurately and can be adapted to different vehicles more easily than conventional ABS (Anti-lock Brake System) systems. In realizing the wheel slip control systems, real-time information such as the tire braking force at each wheel is required. In addition, the optimal target slip values need to be determined depending on the braking objectives such as minimum braking distance and stability enhancement. In this paper, a robust wheel slip controller is developed based on the adaptive sliding mode control method and an optimal target slip assignment algorithm is proposed for maximizing the braking force. An adaptive law is formulated to estimate the braking force in real-time. The wheel slip controller is designed based on the Lyapunov stability theory considering the error bounds in estimating the braking force and the brake disk-pad friction coefficient. The target slip assignment algorithm searches for the optimal target slip value based on the estimated braking force. The performance of the proposed wheel slip control system is verified in HILS (Hardware-In-the-Loop Simulator) experiments and demonstrates the effectiveness of the wheel slip control in various road conditions.

Design Of Adaptive Sliding Mode Control For Aircraft Anti-Braking System (항공기 Anti-Braking System을 위한 적응 슬라이딩 모드 제어기 설계)

  • Choi, Hyung-Sup;Lee, Won-Ju;Park, Mig-Non;Kim, Eun-Tai
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.1083-1084
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    • 2008
  • This paper proposes the design of anti-braking system on aircraft and wheel slip ratio control using adaptive slide mode control. By maintaining the desired wheel slip ratio under runway conditions, we can obtain the maximal frictional force and reduce the braking range. In this paper, we apply an adaptive sliding mode control to aircraft brake system and it can guarantee the robustness under variations in brake characteristics. The performance of proposed controller is verified in simulations.

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Characteristics of Braking Noise in accordance with Operating Mode of KTX High Speed Vehicle (KTX 열차 운전 모드에 따른 정차소음 특성)

  • Lee Chan-Woo;Kim Jae-Chul;Cho Jun-Ho
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.816-822
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    • 2005
  • High speed trains with maximum speed of 300km/h, named KTX, have started revenue services since April 2004. Is becoming big problem where currently the KTX train because excessive braking noise at a station platform. The KTX braking noise follows in operating mode of KTX train and important railroad station where the quality appears different, the quality against hereupon from the commerce vehicle from the research which it sees it executes and comparison to analyze.

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Performance Evaluation of Regenerative Braking System Based on a HESS in Extended Range BEV

  • Kiddee, Kunagone;Khan-Ngern, Werachet
    • Journal of Electrical Engineering and Technology
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    • v.13 no.5
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    • pp.1965-1977
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    • 2018
  • This paper proposed a regenerative braking system (RBS) strategy for battery electric vehicles (BEVs) with a hybrid energy storage system (HESS) driven by a brushless DC (BLDC) motor. In the regenerative braking mode of BEV, the BLDC motor works as a generator. Consequently, the DC-link voltage is boosted and regenerative braking energy is transferred to a battery and/or ultracapacitor (UC) using a suitable switching pattern of the three-phase inverter. The energy stored in the HESS through reverse current flow can be exploited to improve acceleration and maintain the batteries from frequent deep discharging during high power mode. In addition, the artificial neural network (ANN)-based RBS control mechanism was utilized to optimize the switching scheme of the vehicular breaking force distribution. Furthermore, constant torque braking can be regulated using a PI controller. Different simulation and experiments were implemented and carried out to verify the performance of the proposed RBS strategy. The UC/battery RBS also contributed to improved vehicle acceleration and extended range BEVs.

A Study of Energy Saving Hydraulic System by A Pressure Coupling Hydrostatic Transmission (압력커플링 정유압 변속기를 이용한 에너지 절감 유압시스템에 관한 연구)

  • Do, H.T.;Ahn, K.K.
    • Journal of Drive and Control
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    • v.9 no.1
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    • pp.10-17
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    • 2012
  • Nowadays, the demand of energy saving is increasing more and more while the natural resources have been exhausted. Besides, the emission gas caused by vehicles has been being a serious environment problem. Therefore, many studies have been carried out, especially focusing on braking energy regeneration, in order to save energy as well as reduce emission of mobile vehicles. In this paper, we propose a closed-loop hydrostatic transmission for braking energy regeneration with two configurations to reduce the energy consumption by recovering the braking energy. The effectiveness of the proposed system was verified by simulation. The simulation results indicated that the pressure coupling configuration gave better performance in comparison to flow coupling configuration about 40.8%, 61.7% and 53.8% reduction of fuel consumption in 10 mode, 10 mode modified profile and highway schedules, respectively.

Characteristics of Braking Noise of KTX High Speed Vehicle (KTX 열차 정차 제동 소음 특성)

  • Lee C.W.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.1-5
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    • 2005
  • High-speed trains with maximum speed of 300km/h, named KTX, have started revenue services since April 2004. Is becoming big problem where currently the KTX train because excessive braking noise at a station platform. The KTX braking noise follows in operating mode of KTX train and important railroad station where the quality appears different, the quality against hereupon from the commerce vehicle from the research which it sees it executes and comparison to analyze.

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Robust Control of an Anti-Lock Eddy Current Type Brake System (잠김 방지 기능을 가지는 비접촉식 와전류형 제동장치의 견실제어)

  • 이갑진;박기환
    • Journal of Institute of Control, Robotics and Systems
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    • v.4 no.4
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    • pp.525-533
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    • 1998
  • A conventional contact type brake system which uses a hydraulic system has mny Problems such as time delay response due to pressure build-up, brake pad wear due to contact movement, bulky size, and low braking performance in high speed region. As vehicle speed increases, a more powerful brake system is required to ensure vehicle safety and reliability. In this work, a contactless brake system of an eddy current type is proposed to overcome problems. Optimal torque control which minimizes a braking distance is investigated with a scaled-down model of an eddy current type brake. It is possible to realize optimal torque control when a maximum friction coefficient (or desired slip ratio) corresponding to road condition is maintained. Braking force analysis for a scaled-down model is done theoretically and experimentally compensated. To accomplish optimal torque control of an eddy current type brake system, a sliding mode control technique which is, one of the robust nonlinear control technique is developed. Robustness of the sliding mode controller is verified by investigating the braking performance when friction coefficient is varied. Simulation and experimental results will be presented to show that it has superior performance compared to the conventional method.

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Regenerative Braking Characteristics of Linear induction Motor for MAGLEV (자기부상열차용 선형유도전동기의 회생 제동 특성 해석)

  • Park, Seung-Chan;Lee, Won-Min;Kim, Jung-Cheol;Park, Yeong-Ho
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1866-1870
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    • 2008
  • In this paper, electric braking performances of linear induction motor(LIM) designed for propelling the MAGLEV are presented. Regenerative braking is carried out from 110km/h to 20km/h, and plugging which converts the direction of travelling magnetic field is carried out in the low speed region below 20km/h. It is important to reduce attractive force which can affect the magnetic levitation load during regenerative braking or plugging operation mode. So in this paper the braking performances are analyzed by finite element method. As a result, braking force, attractive force, phase current, voltage to frequency patterns and its magnetic fields of braking LIM are presented.

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