• 드라이브 ㆍ 컨트롤
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• 제10권2호
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• pp.30-36
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• 2013

Tractor is a farm vehicle that is designed to provide a high tractive effort at low speed. It is used for versatile agricultural tasks such as hauling a trailer, tillage, mowing and construction work. Most older tractors use a manual transmission. However, as the intensity of work increases, tractors equipped with automatic transmission become popular due to the work convenience. In order to give the operator a large degree of control in field work, 24 gears with automatic 8-speed and manual 3-speed are arranged in transmission. This paper deals with the gear train that is designed for 8-speed automatic transmission by the engagement of multi-disk clutches. The gear ratio for each speed as well as power transmission mechanism is analyzed through velocity analysis. In addition, constraints of mesh gear ratio are derived by investigating the power flow path in velocity diagram for the given 8-speed gear ratio.

• 조명전기설비학회논문지
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• 제25권12호
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• pp.94-100
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• 2011

TCMS is the most important controller in the subway train for reliable train control and service oriented flexibility. TCMS software charges communications and control of train and maintains control devices so we use QNX for real-time control. This paper introduces overall software development of TCMS using various diagrams. Software implementation details in TC and CC are explained using deployment diagram through train configuration. Driving control process among many processes is focused to present implement details which controls train by driver or automatic train operation and handles commands to control deriving devices in cars. Reliable operation of train and easy maintenance process is achieved through the same hardware in train control computer and car control computer.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1457-1459
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• 2000

The ATO(Automatic Train Operation System) system is equipment for automatic and driverless operation of electric train with minimum control of operator. In this paper, we made ATO system with national technic and passed type test. We are convinced of reliability and safety of the ATO system on the seoul metro 7 line.

• 한국산학기술학회논문지
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• 제16권9호
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• pp.6274-6281
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• 2015

무선통신기반 열차제어시스템은 차상과 지상과의 양방향 무선통신을 기반으로 실시간 열차간격제어가 가능하므로 운전시격 단축 효과가 있으며 궤도회로를 사용하지 않기 때문에 설비투자를 절감 할 수 있다. 무선통신기반 열차제어시스템에서 가장 중요한 부분인 자동열차방호(ATP: Automatic Train Protection)는 실시간 열차위치 추적을 기반으로 선행열차와 후행열차간의 안전한 간격제어를 수행한다. 본 논문은 도시철도용 무선통신기반 열차제어시스템의 열차간격제어를 위한 전체적인 ATP 열차간격제어 알고리즘과 ATP의 처리속도 향상을 위해 전처리 기반 속도프로파일 계산 알고리즘을 제안한다. 제안된 속도프로파일 계산 알고리즘은 사전에 선로와 열차의 영구속도제한에 해당하는 프로파일을 미리 계산하여 가장제한적인 속도프로파일로 활용한다. 만약 운행 중 특정 노선 구간에 임시속도제한이 발생하는 경우 미리 계산된 영구속도프로파일에 임시속도제한을 반영하여 해당 구간의 속도프로파일을 업데이트함으로써 계산효율을 높일 수 있다. 제안된 속도프로파일 계산 알고리즘의 성능을 평가하기 위해 시간복잡도 O-notation으로 분석하였으며 그 결과 기존에 비해 시간 복잡도를 개선할 수 있음을 확인하였다. 또한 ATP 열차간격제어 검증을 위해 열차간격제어 시뮬레이터를 제작하였으며 실험결과를 통해 다양한 운영상황에서 안전한 열차간격제어가 이루어지고 있음을 확인하였다.

• 한국도시철도학회논문집
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• 제6권4호
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• pp.363-372
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• 2018

열차제어시스템의 기능 및 성능 검증을 위해 실제 열차 시험의 전 단계로 시뮬레이터를 이용하는데 이 경우 시뮬레이션 결과가 실제 시험과 얼마나 부합하는 지가 중요하다. 본 논문에서는 열차제어시스템 중 열차자동운전을 담당하는 ATO용 시뮬레이터에 대한 내용을 기술한다. ATO 관점에서 시뮬레이터와의 연결이 실제 열차와의 연결과 동일하도록 시뮬레이터에 실제 열차와 동일한 인터페이스를 구현하여 ATO와 통신하도록 하였다. 또한 시험으로 열차의 특성을 파악하여 열차 모델에 적용함으로써 열차 가감속 명령에 대한 시뮬레이션 상 열차의 반응이 실제와 유사하게 나타나도록 하였다. 시뮬레이션으로 수행한 정차 제어 시험 결과와 실제 본선 시운전 시험 결과를 보임으로써 본 연구에서 도출한 모델의 충실성과 시뮬레이터의 우수성을 보인다.

• 전기학회논문지P
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• 제53권1호
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• pp.32-39
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• 2004

Railway signaling systems consist of several vital computerized equipment such as CTC(Centralized Traffic Control), EIS(Electronic Interlocking System), ATC(Automatic Train Control) and so on. Currently, the project for development of railway signaling systems for the next-generation high-speed train is progressed according to the G7 project and railway signaling related several companies and research institute are joined this project consortium. The railway signaling systems, being developed in this project, called as a kTCS(Korean Train Control System), is composed of kTCS-CTC, kTCS-IXL, kTCS-ATC and etc. kTCS signaling systems have to be operated at the laboratory testing level as integrated signaling systems by interface between each railway signaling systems before railway field installation and revenue service. To solve this matter, communication protocols between each signaling equipment are designed and message codes for each defined protocols have defined. And also several equipment has developed for the railway integrated signaling systems for laboratory testing. We has plentifully tested and verified the designed protocols and the characteristics of integrated railway signaling systems with our developed each kTCS signaling equipment and communication protocols. In this paper, the integrated kTCS system including communication protocols is presented.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제53권9호
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• pp.545-551
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• 2004

CBTC(Communication Based Train Control) System can improve train operation efficiency by realizing moving block system which makes a continuous train interval control in accordance with the position and speed of train. Adopting radio transmission to make a continuous detection of train position and transmit the control data from the ground to a train, CBTC needs dedicated train operation and control algorithm which should be quite different from the conventional track-circuit-based train control system. This paper provides a train operation display and control algorithm for CBTC system in making train interval control, train route control and train supervision. Signalling pattern diagram is devised to analyze the train interval control mechanism of moving block system, and interlocking logic is devised to represent the train route control mechanism of moving block system. For train supervision, train occupation status on railway are displayed by using the segment which virtually divide the whole railway. The proposed method has been successfully applied to the development of CBTC system for the standardized AGT(automatic guided transit) which is under construction now in Korea, and also can be applied to any other CBTC system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.578-585
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• 2000

ATC/ATO/TWC System is the used for the train operation instead of drivels. It is interfaced with train, train equipment, wayside facilities. In this paper described configuration signaling system, construction of signaling system software and structure of system safety. This paper describes the method of performing automatic driving by ATC/ATO/TWC. Also, reported test result for mainline static test and mainline running test.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.228-230
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• 2006

While trains perform a complete precision stopping control at stop point, it is essential to keep better commuters comfort in prompt. Because a train's brake force tends to increase a brake effort in a low speed and a low brake effort, a brake force in motor cars must be increased to keep better passenger comfort, to control the special braking qua1ities and to prevent the impact of the automatic coupler rather than trailer's, Rail cars must have a special braking process for the train stopping control. In the train stop mode, the train stopping control is designed to start at 20km/h. It starts by Dynamic brake blending, and then finally stops by only the friction. If these process are not exactly activated, the train may fail a complete precision stop. In this report, it studied the electric and friction brake processing during the precious stopping control. To achieve exact test results, the speed reference has to be reduced the calculated difference. In the precision stopping control. the ways of the keeping brake force in motor car was analyzed and some solutions of controling air pressure was brought up by means of direct test in main line, This study was based on line 5 in Seoul Metropolitan subway.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.1253-1254
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• 2012