• Title/Summary/Keyword: Hydraulic clutch

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Verification of Control Algorithm for Removing Oil Contaminant Factor from Proportional Pressure Control Valve (전자식 비례 압력제어밸브 내 오일 오염 입자 제거 제어 알고리즘 검증)

  • Cheon, Su Hwan;Park, Jin Kam;Jang, Kyoung Je;Sim, Sung Bo;Jang, Min Ho;Lee, Jin Woong
    • Journal of Drive and Control
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    • v.18 no.4
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    • pp.1-8
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    • 2021
  • An electro proportional pressure control valve is mainly used to control the clutch of an agricultural tractor's automatic transmission. During transmission, the operating, hydraulic oil is mix with many kinds of contaminants. The contaminants can be trapped between the valve body and spool of the proportional pressure control valve leading to abnormal operating conditions and finally critical damage to the transmission hydraulic system. The present study aimed to verify the valve control algorithm as a basic study of developing control logic that removes contaminants between the spool and the body of the proportional pressure control valve. To develop the algorithm, MATLAB/SIMULINK was used. PWM method was used to control the applied solenoid coil current. The effectiveness of the algorithm was verified by comparing the actual pressure of the normal valve with the actual pressure of the abnormal valve. Based on the present study findings, when the algorithm was applied, the response of the valve pressure according to the current became stable and oil contaminated particles were removed. In the future study, the control algorithm will be optimized for the stability of the proportional pressure reducing valve, and it will be verified in consideration with the driving of the clutch.

A Study on the Improvement of Trolling Equipment for Spanish Mackerel and Yellow Tail in the Coast of Jeju island (제주 연근해 삼치·방어용 끌낚시의 조업 장비 개발)

  • Park, Young-Seok;Kim, Byung-Yeob;Lee, Chang-Heon
    • Journal of Fisheries and Marine Sciences Education
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    • v.27 no.2
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    • pp.422-429
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    • 2015
  • The purpose of this study is the improvement of the existing trolling hauler, which has only one wheel to wind a main line, for saving man power around the coast of Jeju island. The trolling hauler manufactured for a test performance consisted of the wheel part of a main line and the roller part of a leader line including labor-saving devices comprised of a friction clutch, a fastener and springs. Even though this existing electric hauler system is convenient to control the wheel speed and the winding direction, it is apt to cost high and to corrode quickly at sea. Therefore, to remove these negative elements and to operate rollers for hoisting a leader line of the trolling, hydraulic motors were used separately. As a result, according to using of labor-saving devices, the towing tension occurred in operating in fishing ground could be selected moderately without breaking of lines and the operating efficiency of the trolling hauler was verified.

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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A Study on the Lubrication Flow Distribution in a Six-speed Automatic Transmission Valve Body (6속 자동변속기 밸브바디의 윤활오일유량 분배 특성 연구)

  • Kim, Jin-Yong;Na, Byung-Chul;Lee, Kye-Cheul
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.2
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    • pp.79-84
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    • 2011
  • In general, a valve body of the automatic transmission(AT) is controlled by the clutch, the brake and lubricating oil flow in a hydraulic system and lubricant flow for each valve can be adjusted independently. To increase the lifetime of AT, the lubrication flow rate in a valve body for a 6 speed AT based parallel hybrid electric vehicle must be provided with proper oil distribution and control. In this study, we carried out several experiments without the inner parts of AT and with a AT assembly. The variation of the flow rate on oil temperature and pressure between an oil supply port and the outlets of the lubrication port was evaluated and analyzed. In the case of AT without the inner parts, it was evident that as the oil required for an operation of the clutch and brake was discharged from the outlet port, the flow rate from each lubrication port is decreased. However, the flow rate of the AT assembly was slightly increased. In addition, the lubrication flow rate was increased with increasing the oil temperature, and also it was reduced with increasing the oil pressure. Details of the resulting data are discussed.

Design Parameter Analysis of the Proportional Control Valve for Wheel-Loader Automatic Transmission (휠로더 자동변속기용 비례 제어 밸브의 설계 특성 해석)

  • Park, Young-Jun;O, Joo-Young;Yun, Ung-Kwon;Lee, Guen-Ho
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.5
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    • pp.27-35
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    • 2010
  • A loader used for uploading materials into truck is a kind of construction equipment. Mainly, a wheel loader is applied to construction work. Recently, an automatic transmission for the wheel loader is used to help drivers get the repetitive works done comfortably. It is composed of geartrain, clutch pack, hydraulic control system and TCU. Especially, a high-performance proportional control valve and its control algorithm is demanded to achieve the shift quality during a change of speed. In this paper, the commercial package program was used in order to justify model of the proportional control valve and simulate it. Steady-state and dynamic characteristics of PCV were analyzed to classify attractive forces and hydraulic control characteristics. This model also was verified the validity compared to the experimental result. Using the developed model, performances of PCV were predicted as studying design parameters.

Adaptive Compensation Control of Vehicle Automatic Transmissions for Smooth Shift Transients Based on Intelligent Supervisor

  • Kim, Deok-Ho;Han, Jin-O;Sin, Byeong-Gwan;Lee, Gyu-Il
    • Journal of Mechanical Science and Technology
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    • v.15 no.11
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    • pp.1472-1481
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    • 2001
  • In this paper, an advanced shift controller that supervises the shift transients with adaptive compensation is presented. Modern shift control systems for vehicle automatic transmission are designe d to provide smooth transients for passengers' comfort and better component durability. In the conventional methods, lots of testing and calibration works have been done to tune gains of the controller, but it does not assure optimum shift quality at all times owing to system variations often caused by uncertainties in shifting hydraulic systems and external disturbances. In the proposed control scheme, an adaptive compensation controller with intelligent supervisor is implemented to achieve improved shift quality over the system variations. The control input pattern which generates clutch pressure commands in hydraulic actuating systems, is updated through a learning process to adjust for each subsequent shift based on continuous monitoring of shifting performance and environmental changes. The proposed algorithm is implemented and evaluated on the experimental test setup. Results from the experimental studies for several operation modes show both improved performance and adaptability of the proposed shift controller to uncertain changes of the shifting environment in vehicle power transmission systems.

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DEVELOPMENT OF A CONTINUOUSLY VARIABLE-SPEED TRANSMISSION FOR AGRICULTURAL TRACTOR

  • Kim, H. J.;Kim, E. H.;K. H. Ryu
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2000.11b
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    • pp.162-169
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    • 2000
  • This study was carried out to develop a continuously variable-speed transmission(CVT) for agricultural tractor. A full-toroidal CVT mechanism with four discs and six rollers was selected as a device for changing speed ratio continuously. In the step of system layout design, the sizes of roller cylinders and end-load cylinder, which were critical factors for controlling the variator, were designed. Also the control pressure range was designed to limit the contact pressure of variator. In order to make the maximum speed of vehicle as 30km/h, the planetary gear and the six pairs of gears were designed. Also the hydraulic clutch, silent chain, hydraulic manifold and electronic controller were designed. After the design, a prototype with CVT controller was developed and tested. The speed of vehicle was changed continuously to the speed set by driver and the settling time was about 0.52 second at the step-response test (reduction ratio of variator 2.0 to 1.0), which was acceptable as a response time for working with tractor.

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Development of Electronically Controlled CVT for Hybrid Passenger Car (하이브리드 승용차용 전자식 무단변속기의 개발)

  • 최득환
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.9
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    • pp.75-81
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    • 1999
  • In this paper, the details of electronically controlled CVT is described , which Kia Motor company recently developed in prototype form for hybrid passenger car. This transmission has two input shafts, one for engine and the other for traction motor. The shaft for traction motor is located at rear side which is extended from primary pulley shaft and connected to traction motor through adapter gear box. Adopting two input system, various driving mode is available such as motor alone driving in hybrid vehicle application. As far as electrohydraulic system concerned , this transmission uses two bleed type variable force solenoids for line pressure and ratio control, and one on-off solenoid for clutch control. Another feature for this transmission is that oil pump for transmission is separate from CVT for supplying oil pressure even at vehicle standstill.

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Development of Loader with Four Wheel Driving and Four-Type Wheel Steering System (4륜 구동 및 4방식 조향장치를 적용한 로더 개발)

  • Cho, Huyn-Deog
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.3 no.3
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    • pp.71-78
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    • 2004
  • The loader of this study is an agriculture machine for a stock farmer. We has much researched about power train and steering system in order to develop a new stock machine. So, the loader developed in this study has a 4 wheel driving system and a 4-type wheel steering system. Though the technological region is some large and general, these technologies are very important and their technical life may be very long. The power train of the loader is consisted of many units as follows, engine, clutch, transmission, and axles. And, the 4-type wheel steering system is consisted of oil tank, oil pump, steering valve, solenold valve, electronic controller, hydraulic cylinders, and touch sensors. This study shows construction logics of power train and steering system. We could know from many working tests that the developed loader with 4-type steeling system has many advantages when driving in a narrow corral.

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Compacting Press의 CNC화

  • Sano, Kazumi
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 1995.11a
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    • pp.6-8
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    • 1995
  • Among powder metallurgy products, complex shaped parts are difficult to be produced. Even i9f it shall be compacted until pet shape, the parts are easily apt to crack. thus it causes inferior productivity.It is present condition that net ahaped parts are obtained by adding after treatment. Clutch hub, pulley, representative partawifh upper 2 steps, tower 3 steps parts are corresponded to the above case. In recent years. muired parts are get to be thinner and thinner, and therefore extremely high compacting techniaues are required. Definition of most preferable com~actingp arts are I) Uniform density 2) Non crack and 3) Realization of net shape or near net shape productlon. For the above purpose, YOSHIZUKA baa developed n now oreas applying hydraulic servo control system.

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