• Title/Summary/Keyword: Gear-shifting

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An Automatic Gear Shifting System of a Bicycle (속도변화에 따른 다단 자전거 자동변속 시스템 개발)

  • Cho, Kwanghyeon;Kim, Jae kwan;Choi, Sunghoon;Lee, Sang hoon;Park, Ill-woo
    • Proceedings of the KIPE Conference
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    • 2010.11a
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    • pp.296-297
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    • 2010
  • 본 연구는 자전거의 속도를 이용하여 자동으로 기어변속을 하는 시스템 개발에 관한 연구이다. 본 논문은 자전거의 기어변속 메커니즘을 활용하여 기어 변속기를 개선함으로써 진행속도에 맞추어 자동으로 기어 변속을 수행하는 시스템의 설계 및 개발에 관하여 서술하였다. 상세하게는 뒷바퀴에 속도 측정장치를 설치하여 회전수에 따라 자전거의 진행하는 속도를 감지하며, 기존 자전거의 변속기에 개발된 전자제어장치를 탑재하여 운행자의 진행속도에 맞추어 자동변속을 구현한다.

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Advanced Real time IoT Eco-Driving Assistant System

  • Jouini, Anis;Cherif, Adnane;Hasnaoui, Salem
    • International Journal of Computer Science & Network Security
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    • v.22 no.4
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    • pp.237-244
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    • 2022
  • Eco-driving of vehicles today presents an advantage that aims to reduce energy consumption and limit CO2 emissions. The application for this option is possible to older vehicles. In this paper, we propose an efficient implementation for IoT (Internet of Things) system for controlling vehicle components that affect the quality of driving (acceleration, braking, clutch, gear change) via Smartphone using Wi-Fi and BLE as communication protocol. The user can see in real-time data from sensors that control driver action on vehicle driving systems such as acceleration, braking, and vehicle shifting through a web interface. Thanks to this communication, the user can control his driving quality and, hence, eco-driving can be achieved

Effect of D-Range Neutral Control of Automatic Transmission on LA-4 Mode Fuel Economy (정지구간에서 자동변속기 D단 중립 제어가 LA-4 모드 주행 연비에 미치는 영향)

  • Wi, Hyo-Seong;Jung, Youn-Sik;Park, Jin-Il;Park, Kyoung-Seok;Lee, Jong-Hwa
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.1
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    • pp.19-23
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    • 2009
  • This paper focuses on vehicle fuel economy improvement using D-Range neutral control of automatic transmission. The system objected to reducing of fuel consumption during idle. Usually, turbine of conventional auto transmission is mechanically linked to wheel during idling condition. Therefore speed ratio of torque converter is zero for that period. This causes needless power loss by the torque converter slip. To improve this inefficiency automobile makers develops electronically-controlled D-range neutral control system. The D-range neutral control system minimizes slip on the torque converter by shifting gear to a neutral position during vehicle stoped with D-range gear position. However there's insufficient study about the effect of D-range neutral control system on vehicle fuel economy. In this paper, researches are performed on effect of D-range neutral control system on vehicle fuel economy by experiment with two different vehicle. And it is also estimated the effect on vehicle fuel economy using computer simulation. As a result, 1.8% of LA-4 mode fuel economy improvement can be achieved in a vehicle by D-range neutral control system.

A Study on the Transition Process of Fisheries Industry, Fisheries Institute of West Coast of Korea (Around the Gogunsan Islands and adjacent Area) (우리 나라 서해안(西海岸)의 수산업(水產業) 및 수산교육기관(水產敎育機關)의 변천과정(變遷過程)에 관한 사적(史的) 고찰(考察) (고군산(古群山) 군도(群島)의 인접지역(隣接地域)을 중심(中心)으로))

  • Lee, Kil-Rae
    • Journal of Fisheries and Marine Sciences Education
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    • v.11 no.1
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    • pp.24-42
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    • 1999
  • I have studied historical transition process of fisheries industries, fisheries Institute in abreast of developing fisheries industries of west coast of Korea since 1910 year with regard to the Gogunsan Is. The results were summarized as follows. In 1910 year, fishery industry has been carried out shifting fishing gear e.g set-net in shallow waters, small stow net, small seine net adapting to the tophorgrapical feature, shape of coast, oceanic condition, however, the fishing gear and fishing method were undeveloped, so that, Japanese fishermen had been exploited fisheries resources penetrating the fishing ground. Most important species were lot of captured croaker, cod, spanish mackeral, sea abream, herring in coastal sea. nowaday, squid, anchovy, shrimp, crab, pompret were much captured. The species were captured in 18 century were not captured. It is rarely than that period. Fishereis aquatic culture had been not farmed till 1960 year, but sea laver, shrimp, crab, had been breeded 1970 year also, the fresh water fish e.g. eel, cat-fish had been breeded activately. The fisheries processing industry were composed of salt. icing, dry, method. the salted fish industry had been prevailed at Gangyng, Kwangchon, Kunsan, Julpo comparatively. The fisheries institute had been established at Kunsan at first, but institute established in other region had been abolished in a short time. This phenomenon was related with development of fisheries resources. The western coast fisheries industries had been wasted of decreasing of fisheries resources, variation of environment. Accordingly, the study of preserving the marine resources. educated man power who engaged in fisheries field have to accomplish. Sea was dying with reason of loss of mud in west coast factory waste, waste of life the increase of accident of sea polluted, each illegal fishing industry physical and chemical reason etc. in this respect, Kusan maritime college, fisheries developing agency, institute have to take important role for developing fishing industry.

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A study on Shift Efficiency Characteristics of a 2-speed Transmission applying CVT Structure (CVT구조를 적용한 2단 변속기의 효율특성에 관한 연구)

  • Kwang-Wook Youm
    • Journal of the Korean Institute of Gas
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    • v.28 no.1
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    • pp.59-64
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    • 2024
  • In this study, we conducted research on a miniaturized transmission system suitable for ultra-compact electric vehicles, such as electric arts or small electric cars. While conventional electric vehicles eliminate multi-gear transmissions and control motor output or secure initial driving force through reducers, in vehicles like electric karts or compact electric cars, which have relatively small battery capacities, the driving range can be reduced or the motor can be stressed epending on the loading state. Therefore, in this study, we developed a low stage ratio 0.625 and high stage ratio 1.6 a two-stage transmission system that can change gears as needed, considering factors such as slope conditions and loading status, by applying the continuously variable transmission (CVT) mechanism. Based on the selected gear ratios, we designed the transmission and created a test rig to verify the power transmission efficiency of the developed transmission. Using the test rig, we varied the rotational speed and load of the transmission to confirm its power transmission characteristics and also examined the heat generation characteristics during shifting and operation. As a result, developed a two-stage transmission with a CVT structure.

A Development of Parallel Type Hybrid Drivetrain System for Transit Bus Part 2 : A Development of Advanced Shift Control Algorithm for Hybrid Vehicle with Automated Manual Transmission (버스용 병렬형 하이브리드 동력전달계의 개발(II) 제2편 : 자동화변속기가 장착된 하이브리드 차량의 향상된 변속 제어 알고리듬 개발)

  • 조한상;조성태;이장무;박영일
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.96-106
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    • 1999
  • In this study, the advanced shift control algorithm for parallel type hybrid drivetrain system with automated manual transmission(AMT) is proposed. The AMT can be easily realized by mounting the pneumatic actuators and sensors on the clutch and shift levers of the conventional manual transmission. By using the electronic-controlled AMT, engine and induction machine, it is possible to achieve the integrated control of overall system for the efficiency and the performance of the vehicle. Performing the speed control of the induction machine and the engine, the synchronization at gear shifting and the smooth engagement of clutch can be guaranteed. And it enables to reduce the shift shock and shorten the shift time. Hence, it results in the improvement of shift quality and the driving comfort of the vehicle. Dynamometer-based experiments are carried out to prove the validity of the proposed shift control algorithm.

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Automatic Control of Engine Speed and Transmission Ratio for Efficient Tractor Operations(I) -Control Systems for Engine Speed and Transmission Ratio- (트랙터의 기관속도(機關速度) 및 변속비(變速比)의 자동제어(自動制御)에 관(關)한 연구(硏究)(I) -기관속도(機關速度) 및 변속비(變速比) 제어(制御) 시스템-)

  • Kang, S.B.;Ryu, K.H.;Oh, K.K.
    • Journal of Biosystems Engineering
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    • v.18 no.4
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    • pp.305-316
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    • 1993
  • Fuel efficiency in tractor operations dep6nds on the selection of transmission gears and upon the engine being operated at or near maximum torque much of time. The objective of this study was to develop automatic control systems for tractor transmission ratio and governor setting so that the engine is operated at or near maximum torque as much of time as possible. An indoor test unit, which can be used to simulate tractor operation, was built in order to investigate the system design parameters and test the performance of the control system designed. The test-unit consists of engine, gear-type transmission, dynamometer, and control systems for transmission ratio and engine speed. Governor setting lever was controlled by a step motor, and the clutch and transmission levers were controlled by hydraulic cylinders and solenoid valves. The control systems showed good time responses which are assumed to be suitable for optimal tractor operation. The time required for shifting gears from clutch disengagement to engagement was about 1 second, which is almost the same as that for manual shift. And the settling time for engine speed control system was about 5 to 6 seconds.

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Development of Clutch Auto Calibration Algorithm for Automatic Transmission Shift Quality Improvement (자동변속기 변속품질 향상을 위한 클러치 자동보정 알고리즘 개발)

  • Jung, Gyuhong
    • Journal of Drive and Control
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    • v.17 no.3
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    • pp.47-56
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    • 2020
  • As a shift control of automatic transmission was managed with the electronic control unit (ECU), shift quality which is a measure of shift shock during gear change has markedly improved. However, the initial clutch pressure control of the clutch filling phase should continue to rely on the predetermined control input since the input and output speeds are unchanged until the shifting process attains the inertia phase. It is critical to minimize the clutch response time and control the clutch pressure accurately at the end of clutch fill to achieve quick shift response and smoothness. Advanced transmission companies have adopted an auto calibration method which establishes the databases for the clutch piston fill-up attributes and the frictional characteristics of the disks. In this study, a distinctive auto calibration algorithm for forklift transmission under development is proposed and verified with the real-vehicle test. The experimental calibration results showed consistent turbine dynamics at the initial stage of shifts with the properly calibrated clutch-fill control parameters. By using this technique, it is necessary to finalize the shift control for the various operation conditions.

Yaw Moment Control Algorithm based on Estimated Vehicle Mass for Manual-Shift Commercial Vehicles (질량 추정기 기반 수동 변속 상용차용 요 모멘트 제어 알고리즘)

  • Kim, Jayu;Cha, Hyunsoo;Park, Kwanwoo;Yi, Kyongsu
    • Journal of Auto-vehicle Safety Association
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    • v.14 no.2
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    • pp.7-13
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    • 2022
  • This paper presents a yaw moment control based on estimated mass for manual-shift commercial vehicles. In yaw moment controller, parameter uncertantiy of vehicle mass is important because the desired yaw moment depends on vehicle parameter. However, in the case of commercial vehicle, the weight of the loaded vehicle is more than twice as much as compared to the unloaded vehicle. The proposed algorithm estimates the vehicle mass by using the longitudinal dynamic and gear shifting characteristics. The estimated mass is used to adaptively modify the vehicle parameters. In addition, this paper estimates the chamber pressure of a pneumatic brake and generates the target yaw moment through on/off valve control. MATLAB/Simulink and Trucksim were performed under sine with dwell test. The results demonstrate that the proposed algorithm improves the lateral and rollover stability.

Efficiency Improvement of Transfer Drive Gear Bearings for an Automotive Automatic Transmission (승용차 자동변속기용 트랜스퍼 드라이브 기어 베어링의 효율개선 방법에 관한 연구)

  • Lee, In Wook;Han, Sung Gil;Gwak, Beom-Seop;Lee, Ho Sung;Song, Chul Ki
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.3
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    • pp.40-46
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    • 2021
  • An automatic transmission of automobiles enables comfortable driving experience with lower transmission shifting jerks. However, the assembly structure is more complicated and requires additional components with lower efficiency than the manual transmission system. Extensive research has been conducted to improve the overall transmission efficiency by optimizing each component of the automatic transmission assembly. This study focuses on enhancing the friction torque of double angular contact ball bearings used in automatic transmission. The friction torque of the bearing varies with the operating conditions such as the operational load and rotating speed. Since reducing the friction torque of the bearing tends to deteriorate the durability of the bearing, it is necessary to design the bearing having a minimum required friction torque by determining the durability life of an automatic transmission assembly, In this study, the theoretical life and friction torque of conventional and newly-developed bearings are calculated. The difference in the friction torque between the new and existing bearings are also evaluated.