• Title/Summary/Keyword: 제동시간

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A Study on the Accurate Stopping Control of a Train for the Urban Rail Transit Using Kalman Filter (칼만 필터를 이용한 도시철도 열차 정위치 정차에 관한 연구)

  • Kim, Jungtai;Lee, Jaeho;Kim, Moo Sun;Park, Chul Hong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.11
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    • pp.655-662
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    • 2016
  • Accurate stopping control is important for trains, especially now that many train stations are equipped with platform screen doors. Various algorithms have been proposed for accurate stopping control. However, most metro trains in South Korea use classic control algorithms such as PID control because other algorithms are too complex to realize. PID control has merits of simple structure and operation. However, PID control sometimes fails, and much time is needed to find the proper coefficients due to the long control period and the brake delay. We propose a control algorithm that uses a Kalman filter. The Kalman filter estimates the states at the time when braking starts. Then, a suitable control input is derived for proper control. System modeling and a computer simulation were performed with consideration of the brake properties and the period of the control system. The superiority of the proposed control algorithm is shown by analyzing stop errors.

Study of Fuel Consumption Characteristics and Regenerative Braking Recovery Rate in a TMED Type Parallel Hybrid Electric Vehicle (TMED방식 병렬형 하이브리드 차량의 회생제동 회수율 및 연비 특성 연구)

  • Chung, Jin Ho;Kim, Jin Su;Kim, Ju Whan;Lee, Jin Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.40 no.8
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    • pp.485-494
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    • 2016
  • In this work, we conducted a study of fuel consumption characteristics and regenerative braking recovery rate by conducting an experiment using a TMED type parallel hybrid electric vehicle. As regenerative braking technology is considered essential to improve the energy efficiency of the hybrid vehicle, it is necessary to conduct research on the regenerative braking system. Therefore, the electrical characteristics, current balance, and fuel consumption were investigated using an EC type chassis dynamometer with experimental conditions as per IM240 mode. From the results, it was observed that when the initial SOC condition was lower, the engine operating time of the hybrid vehicle increased, and the energy efficiency decreased. While operating in the driving mode characteristics condition and the driving characteristics condition, the difference in the average fuel consumption was not significant. However, after completion of the experiment, there was a difference in the engine operation.

The Korea Academia-industrial cooperation Society (상용 트럭의 공압 브레이크 응답 특성에 관한 연구)

  • Kim, Jin-Taek;Jung, Do-Gyun;Choi, Pan-Jin;Park, Won-Ki;Park, Chan-Hee;Ryuh, Beom-Sahng;Baek, Byung-Joon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.5
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    • pp.1969-1975
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    • 2012
  • The air brake system used in heavy vehicle is very important from the point of safety due to its weight. In general, air brake system generates relatively long response time and large loss of pressure. It is known that the response time can be decreased by optimal design of brake system, i.e., by increasing the system pressure, minimizing the air line, and material of components. In this study, We developed experimental rigs for the measurement of braking response of heavy duty trucks and compared with the simulated results obtained from the net work fluid flow system analysis code (FLOWMASTER). The effect of several parameters such as, system pressure, diameter of pipe, chamber temperature on the brake response performance have been examined.

Understanding for Classical Control System by Analysis of Program-based Time Response (프로그램 기반의 시간응답 해석에 의한 고전제어 시스템 이해)

  • Min, Yong-Ki;Wi, Young-Min
    • The Journal of the Korea institute of electronic communication sciences
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    • v.11 no.9
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    • pp.893-900
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    • 2016
  • Output response for prototype system is analyzed according to the pole locations and the damping ratio changes. The system modeling is constructed for RLC-circuit and the output response is analyzed for both a unit-step and a sinusoidal input. The survey is conducted to estimate the understanding ability on the automatic control. A high understanding ability is shown up in analysing the transfer functions of control system. And improvement is manifest in the ability to understand the output response according to the parameter changes. But some difficulty is revealed in acquiring the output responses in time domain.

The Effect of the Heel Rest on Braking Reaction Time while Driving Vehicle with Automatic Transmission (오토 차량 운전시 보조 발판이 제동 시간에 미치는 영향)

  • Kim, Jeong-Ryong;Jo, Yeong-Jin;Park, Ji-Su;Seo, Gyeong-Bae
    • Journal of Korean Society of Transportation
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    • v.24 no.1 s.87
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    • pp.53-58
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    • 2006
  • The purpose of this study was to test the safety of the heel rest which was made for reducing the automobile driver's muscle fatigue with automatic transmission. Sixty subjects participated in the test, including ten males and ten females in 30s, 40s, 50s, respectively. Simulator consisted of automobile cockpit, accelerator and brake pedal sensor, heel rest. and driving displays. 30 seconds were given to subjects to be accustomed to the simulator environment. They also had one pre-trial to use the brake pedal according to the experimental scenario. They were told to step on the brake pedal immediately as soon as the red light was on the display The reaction time representing the foot travel time between accelerator and brake pedal was measured with/without the heel rest. In results, there was no significant difference in reaction time between conditions with/without heel rest. The result indicated that the heel rest used in this study would be a safe accessory for drivers who need to reduce the fatigue of the muscle or joint during driving.

Characteristic Test of the Electro Mechanical Brake Actuator for Urban Railway Vehicles (도시철도용 전기기계식 제동장치의 특성시험)

  • Kim, Min Soo;Oh, Seh Chan;Kwon, Seok Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.7
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    • pp.535-540
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    • 2016
  • The braking device in railway vehicles decelerates or stops the train by dissipating the thermal energy converted from kinetic energy into the air. Therefore, the brake system is crucial for safety. In this paper, we performed a study on an electromechanical brake actuator using an electrical motor as an alternative to pneumatic air cylinders to reduce the idle running time in braking, which subsequently increases braking distance, and to ensure reliable response characteristics. Especially, to analyze the response characteristics of the electromechanical brake actuator, we measure the delay time, response time and power consumption compared to the air cylinder. It is confirmed that the electromechanical brake actuator can reduce reaction time by 0.1 seconds (Braking Action) and 0.46 seconds (Brake Release) compared to the air cylinder.

A Study on Braking Performance of Break Disc (브레이크 디스크의 제동 성능에 관한 연구)

  • Ryu, Mi-Ra;Bae, Hui-Eun;Kim, Hyun-Su;Lee, Dae-Hee;Lee, Seong-Beom;Park, Jeong-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.3
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    • pp.13-20
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    • 2013
  • The present research aims to develop the aluminum disc brake replacing the existing cast iron disc brake. Material such as aluminum using FEM numerical analysis in order to improve the characteristics of each element, we analyze the performance characteristics and braking time you try to change. We try to lay the foundation for the development of an aluminum disc by investigating performance characteristics of the existing cast iron disc brake and comparing them with those of the aluminum disc. This involves FEM dynamics analysis for disc materials and experimental tests using the brake dynamometer. From this study, the results of 7075 aluminum braking performance can be seen that the best.

Development of Advanced Emergency Braking Algorithm for the enhanced longitudinal safety (종방향 안전도 향상을 위한 자동비상제동 알고리즘 개발)

  • Lee, Taeyoung;Yi, Kyongsu;Lee, Jaewan
    • Journal of Auto-vehicle Safety Association
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    • v.5 no.1
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    • pp.56-61
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    • 2013
  • This paper presents a development of the Advanced Emergency Braking (AEB) Algorithm for passenger vehicles. The AEB is the system to slow the vehicle and mitigate the severity of an impact when a rear end collision probability is increased. To mitigate a rear end collision, the AEB comprises of a millimeter wave radar sensor, CCD camera and vehicle parameters of which are processed to judge the likelihood of a collision occurring. The main controller of the AEB algorithm is composed of the two control stage: upper and lower level controller. By using the collected obstacle information, the upper level controller of the main controller decides the control mode based not only on parametric division, but also on physical collision capability. The lower level controller determines warning level and braking level to maintain the longitudinal safety. To decide the braking level, Last Ponit To Brake and Steer (LPTB/LPTS) are compared with current driving statues. To demonstrate the control performance of the proposed AEBS algorithm's, closed-loop simulation of the AEBS was conducted by using the Matlab simlink and CarSim software.

An Experimental Study of Tire-Road Friction Coefficient by Transient Brake Time (실차 실험을 통한 제동순시간에 의한 타이어-노면마찰계수에 관한 연구)

  • Han, Chang-Pyoung;Park, Kyoung-Suk;Choi, Myung-Jin;Lee, Jong-Sang;Shin, Un-Gyu
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.7 s.196
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    • pp.106-111
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    • 2007
  • In this paper, the transient brake time was studied on the van type vehicle with accelerometer. Experiments were carried out on the asphalt(new and polished), unpacked road(earth and gravel) and on wet or dry road conditions. The transient brake time is not effected bzy the vehicle speed. The transient brake time is about 0.41$\sim$0.43second on the asphalt road surface and the error range is within 0.1$\sim$0.16second. For the asphalt road condition, the transient brake time is not effected by both new asphalt road surface and the polished asphalt road surface. With compared by dry and wet road surface condition, the transient brake time of wet condition is longer than dry road condition and compared with unpacked road condition and packed road condition, unpacked road condition is shorter than packed road condition. It is considered that the transient brake time is effected by the road surface fraction coefficient. In other words, the transients brake time increases as friction coefficient decreases.

Performance Investigation of a Brake System Featuring Electro-Rheological Fluids (전기유동유체를 이용한 브레이크 시스템의 성능 고찰)

  • Kim, G.W.;Park, W.C.;Cheong, C.C.
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.7
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    • pp.123-130
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    • 1995
  • This study presents model synthesis and performance investigation of a new brake system using electro-rheological(ER) fluids. Field-dependent Bingham properties characterized by non-zero yield stresses of the ER fluids are experimentally distilled. These properties are then incorporated with the governing equation of the proposed brake system which features design simplicity, fast response and salient controllability. After analyzing system performance with respect to design parameters such as electrode gap and length, an appropriate size of the brake is designed and fabricated. Both simulation and experimental works are undertaken in order to determine the feasibility and efficiency of the proposed brake system. The system performances are justified by evaluating field-dependent braking torques as well as braking times.

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