• Title/Summary/Keyword: 2-speed transmission

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Gear Train Design of 8-Speed Automatic Transmission for Tractor (트랙터 8단 자동변속기 기어 열 설계)

  • Jung, G.H.
    • Journal of Drive and Control
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    • v.10 no.2
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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.

Analysis of Acceleration Performance Improvement for Electric Vehicle Using 2-Speed Transmission (2단변속기를 사용한 전기차의 가속성능 향상 분석)

  • Kim, Jeong-Min
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.21 no.4
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    • pp.84-90
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    • 2022
  • In this study, the acceleration performance improvement was analyzed for a 2-speed transmission applied EV. An EV simulator was developed to analyze the EV acceleration performance. The EV simulator includes a load transfer model between the front and rear. Thus, the EV simulator can analyze the acceleration performance difference between the front-and rear-wheel drive EVs. From the simulation results, it is deduced that the acceleration performance can be improved by 7.96% for the front-wheel drive EV and 16.10% for the rear-wheel drive EV. The 2-speed transmission can improve the acceleration performance without decreasing its maximum velocity. Moreover, the 2-speed transmission can improve the acceleration performance of the rear wheel drive more than that of the front-wheel drive EV.

A New Fast P2P Video Transmission Method Applied in Asymmetrical Speed Channel Environment

  • Wang, Zhang;Zhang, Jixian;Li, Haitao;Liu, Jian
    • Journal of Communications and Networks
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    • v.12 no.3
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    • pp.209-215
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    • 2010
  • In an asymmetrical speed channel environment like asymmetric digital subscriber line, the up-link bandwidth is normally smaller than the down-link bandwidth, which will lead to extremely low utilization of down-link bandwidth when current P2P video transmission is applied. To overcome this, a new fast P2P video transmission method applied in an asymmetrical speed channel environment is proposed in this paper. On the basis of the many-to-one concept, the proposed method uses a new multipeer aggregation technique to enhance the utilization of down-link bandwidth. In addition, an adaptive peer assignment algorithm is also introduced in order to minimize the overall transmission time. Experimental results show that by using our proposed method, the utilization of down-link bandwidth is significantly improved, and the overall transmission time is greatly reduced.

Dynamic response of an overhead transmission tower-line system to high-speed train-induced wind

  • Zhang, Meng;Liu, Ying;Liu, Hao;Zhao, Guifeng
    • Wind and Structures
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    • v.34 no.4
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    • pp.335-353
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    • 2022
  • The current work numerically investigates the transient force and dynamic response of an overhead transmission tower-line structure caused by the passage of a high-speed train (HST). Taking the CRH2C HST and an overhead transmission tower-line structure as the research objects, both an HST-transmission line fluid numerical model and a transmission tower-line structure finite element model are established and validated through comparison with experimental and theoretical data. The transient force and typical dynamic response of the overhead transmission tower-line structure due to HST-induced wind are analyzed. The results show that when the train passes through the overhead transmission tower-line structure, the extreme force on the transmission line is related to the train speed with a significant quadratic function relationship. Once the relative distance from the track is more than 15 m, the train-induced force is small enough to be ignored. The extreme value of the mid-span dynamic response of the transmission line is related to the train speed and span length with a significant linear functional relationship.

Optimization of Shift Control to Improve Driving Efficiency of Battery Electric Vehicles with Two-speed Transmission (2단 변속기 적용 전기차의 구동 효율 향상을 위한 변속 제어 최적화)

  • Taekho Chung;Younghee Kim
    • Journal of ILASS-Korea
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    • v.28 no.2
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    • pp.62-67
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    • 2023
  • Recently, the global automobile industry is aiming for a transition from internal combustion locomotives to zero-emission vehicles. Electric vehicles powered by battery energy can operate at peak performance and improve fuel economy by applying multiple motors or multi-speed transmissions. In order to design a two-speed transmission, it is necessary to evaluate and analyze the application system and performance of electric vehicles. In this study, control performance optimization of a twostage battery electric vehicle equipped with an AMT-based automatic transmission was performed and performance according to control pattern changes was analyzed. In order to improve the operating efficiency of the motor, the shift control that sets the optimal operating point according to the vehicle speed and required torque was derived from the motor efficiency map. The performance of battery energy consumption and transmission loss energy according to the hysteresis interval was analyzed and optimized. The hysteresis interval applied to the optimal shift map acted as a factor in reducing the frequency and loss of shifts. It has been shown that keeping the hysteresis interval at about 4 km/h can reduce energy consumption while reducing the number of shifts.

A Study on a Model of Economic Value of Transmission Speed of Internet Commerce (인터넷 상거래 처리속도의 경제적 가치분석 모형에 관한 탐색적 연구)

  • 노규성;김민철
    • The Journal of Society for e-Business Studies
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    • v.4 no.2
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    • pp.41-58
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    • 1999
  • This paper is a study on a model of economic value of transmission speed of Internet Commerce. For this research, this paper searches the factors that influence the transmission speed of Internet and suggests the model for measurement of economic value. The model adopted in this research is CVM(contingent valuation method) using in environment economics and the research area in this paper is concentrated on Internet-based Electronic Commerce. For this purpose, this paper suggests econometrics model that measures customer's payment intention for transmission speed of Internet. This model can be used as the basic tool of feasibility of investment analysis and reasonable pricing on Internet service. For the more, it will be followed empirical study and more careful comprehension for objective validity of this study.

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Development of Toroidal Type Continuously Variable-Speed Transmission for Agricultural Tractor(2): Control System (트랙터용 토로이달식 무단변속기 개발(2): 제어 시스템)

  • 김의한;이재천
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.4
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    • pp.114-121
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    • 2002
  • This paper describes the control system of the toroidal traction driver continuously variable-speed transmission(CVT) fur a tractor. The instrumentation system, the hydraulic power control system and the principle control scheme were introduced. Experimental tests in the bench and the tractor were conducted to validate the performance of the CVT utilizing the proposed controller. The speed of the vehicle was continuously changed to follow the speed set by driver under various operating conditions. Given the reduction ratio of the variator from 2.0 to 1.0, the settling time was about just 0.52 seconds which was satisfactory value for working with the tractor. It was also proved that the tractor could work with continuously variable speed under heavy load disturbances.

A Study on High Speed Visible Light Communication System Using Non-orthogonal Multiple Modulation Scheme (비직교 다중변조 방식을 이용한 고속 가시광통신 시스템에 대한 연구)

  • Han, Doo-Hee;Lee, Kyu-Jin
    • Journal of Convergence for Information Technology
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    • v.10 no.2
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    • pp.32-38
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    • 2020
  • In this paper, we analyze the modulation scheme for high speed transmission in visible light communication system, and study non-orthogonal multiplexing, dimming level and transmission power ratio. Conventional visible light communication has a disadvantage in that it is difficult to multi-transmit to increase the transmission speed. Multi-transmission technique is necessary for high-speed transmission at the transmitter. Since general visible light communication has a limitation in multiple transmission, various researches for high-speed transmission have been conducted. In order to solve this problem, this paper proposes a multiple modulation scheme for high-speed visible light communication using non-orthogonal multiplex transmission scheme and a future research direction.

Optical transmission technology of Ultra high-speed and Ultra long distance (초고속 초장거리 광전송 기술)

  • 이봉영
    • Information and Communications Magazine
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    • v.11 no.2
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    • pp.77-89
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    • 1994
  • High speed optical fiber transmission technology has been remarkably improved during the past 20 years. This paper presents recent research status and future technological issues for the future information society, that is, the Tb/s transmission by frequency division multiplexing and the ultra long-distance by optical soliton transmission. Erbium-doped fiber amplifier and recent optical technology have brought optical transmission system of up to 10 Gb/s to the point of commercialization. Taking into account the future super information highway, that is, B-ISDN network, ultra wide-band picture-based information can be provided for many subscribers via existing optical fiber cables. However, to achieve the high speed transmission, the technologies must be developed not only for transmission lines but also for transmission nodes. Since the conventional signal transmission/processing technique using electronics has the limit in its speed, novel photonic technology is being developed for this purpose. On the other hand, optical solitons propagate stably through optical fibers, without pulse broadening effect of the fiber dispersion. Since the pulse broadening effect becomes serious as the transmission speed increases, optical solitons is the important technologies to realize the high speed, long distance transmission.

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The Performance Analysis of Transmission Line Codes for the Very-High Speed Optical Transmission System. (초고속 광전송 시스템용 전송로 부호의 성능 분석)

  • Yu, Bong-Seon
    • The Transactions of the Korea Information Processing Society
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    • v.1 no.4
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    • pp.479-489
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    • 1994
  • At the present time, it is an important problem that we are to select a transmission line code for the very-high speed optical transmission system which can confidentially transfer the original information signal sequence efficiently, as it is to be the large capacity and the economization for the optical digital transmission system to transfer the information signal sequence at the very-high speed. Therefore, this paper is to select first the proper transmission line codes for the high speed(more than Mb/s) optical transmission system of the proposed two-level unipolar transmission line codes up to date, and to decide a mBIZ (m Binary with One Zero insertion) code as an optimal transmission line code for the very-high speed optical transmission system, resulting from analyzing the performance at the requirements of the transmission line code, such as the maximum consecutive identical digits, the transmission delay time, the increasing rate of clock, the mark rate, the circuit complexity, the supervision of transmission line error, and power spectrum among the selected transmission line codes.

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