• 제목/요약/키워드: automatic transmission

검색결과 577건 처리시간 0.023초

지게차용 동력전달장치의 조립라인 전용시험기 개발 (Development of the Assembly Line Tester of Power Transmission for Lift Truck)

  • 장경열;유우식
    • 산업공학
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    • 제23권1호
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    • pp.58-67
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    • 2010
  • The purpose of this paper is to present the development processes of the assembly line tester of power transmission for lift truck. Because power transmission is most important part of lift truck, all assembled powertrain parts must be inspected for operational defects, pressures and RPM. Developed assembly line tester is designed to take about 25 minutes for inspecting each assembled power transmission and located it at the end of assembled line. The assembly line no-load tester consists of three parts: (1) the driving hardware part; for installing and operating the transmission. (2) control PCB part; send data from sensors to a computer and control driving part, (3) operation software of no-load tester; for an automatic inspection or manual inspection, for database management and printing transcripts.

자동변속기용 언더드라이브 브레이크 피스톤의 판 단조공정 개선 방안 (Plate Forging Process Design for an Under-drive Brake Piston in Automatic Transmission)

  • 전효원;윤종헌;이정환;김병민
    • 소성∙가공
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    • 제23권2호
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    • pp.88-94
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    • 2014
  • The under-drive brake piston is an essential part in the automatic transmissions of automobiles. This component is manufactured by forging after blanking from S55C plate with a thickness of 6mm. It is difficult to design the plate forging process using a thick plate approach since there will be limited material flow as well as large press loads. Furthermore, the under-drive brake piston has a complex shape with a right angle step, which often results in die unfill and abrupt increase in press load. To overcome these obstacles, a separate die for filling material sufficiently to the corner of the right angle step is proposed. However, this approach induces an uncontrolled workpiece surface between the dies, resulting in flash. This excess flash degrades the tool life in the final machining after cold forging as well as increases the cycle time to obtain the net-shape of the part. In the current study, we propose an optimum process design using a conventional die shaped with the benefit of finite element analysis. This approach enhanced the process efficiency without sacrificing the dimensional accuracy in the forged part. As the result, the optimum plate forging process was done with a two stage die, which reduces weight of by 6% compared with previous process for the under-drive brake piston.

궤환과 순방향 공급경로를 이용한 자동조절 능동가변 등화기의 설계 (Design of automatic Equalizer using Feedback and Feedforward)

  • 이상영;박종국
    • 한국통신학회논문지
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    • 제8권3호
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    • pp.96-104
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    • 1983
  • 동축 케이블이나 케이블 쌍을 사용하는 유선전송 시스템에 있어서 케이블의 전송특성에 의한 손실은 케이블 길이와 주위온도에 따라 변화하며 항상 $\sqrt f$ 특성 형태를 취한다. 이러한 형태의 손실을 보상하기 위해 궤환과 순방향 공급 경로의 직렬결함을 이용한 자동조절 능동가변 등화기를 제시하였다. 본 논문에 제시한 자동조절 능동가변 등화기는 종래의 수동가변 등화기가 가지고 있던 인덕터의 필요성, 복잡한 설계과정, 그리고 매우 복잡한 현대 전자제어 시스템과의 비 양립성 등 대부분의 결점을 제거시켜 준다. 또한 이러한 설계는 다른 능동가변 등화기 설계에 비해 많은 이점을 가지고 있으며 특시 1MHz이하에서의 정확한 등화에 응용할 수 있다.

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345kV 송전선로용 자동클램핑 장치형 스페이서 댐퍼 개발 (A development of the 345kV spacer damper with automatic clamping device for transmission line)

  • 안용호;이동일;김태진;한병성
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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    • pp.278-282
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    • 2001
  • The purpose of this study is to introduce a new spacer damper for the bundle transmission lines network. It has the special design, the main characteristics and advantage of this new kind of spacer damper. An Existing spacer damper with bolted clamps, although widely used, is a method of connection with certain disadvantage both as regards assembly on the conductor and in the course of time. Even if tightening torque is correctly applied by using bolt with share head or torque wrench during working time, the aeolian vibration could involve untightening during life time, so the cable can move into the Jaws and wire's breakage appear. To salve this problems, France, Japan and other countries had developed a spacer damper with an automatic system through many years. This new spacer damper is an original automatic clamping device (beltless) which does not require special tool for its installation. This device prevents clamp unlocking problems, ensures a simple installation and ensures a reliable-tightening during life time. Therefore, it is necessary to localize this boltless spacer damper with automate clamping device.

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자동변속기용 비례제어 솔레노이드밸브 성능시험기 개발 (A Development of Proportional Control Solenoid Valve Performance Tester for Automatic Transmission)

  • 이근호;정규홍
    • 유공압시스템학회논문집
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    • 제3권4호
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    • pp.21-28
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    • 2006
  • The proportional control solenoid valves as well as the PWM solenoid valves operated by electric signal play an important role in the hydraulic system for automatic transmissions to improve the shift quality. However it is not generally available for the performance data because most of the automotive parts manufacturer don't release the specific test results, especially dynamic performance that is essential to design a shift control algorithm. In this research, a performance test equipment that can be applied to various types of pressure control solenoid valve was developed. It was implemented by 8-bit micro-controller with many useful functions such as adjustable PWM carrier frequency, embedded function generator, current controller, data monitoring and acquisitions, etc. for the test of dynamic performance of solenoid valve as well as the steady-state pressure characteristics. The performance test results for the direct type proportional control solenoid valve show not only the validity of overall functions but also its usefulness as a hydraulic valve tester.

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학습제어를 이용한 지게차 자동변속기 상향 변속품질 개선 (An Upshift Improvement in the Quality of Forklift's Automatic Transmission by Learning Control)

  • 정규홍
    • 드라이브 ㆍ 컨트롤
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    • 제19권2호
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    • pp.17-26
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    • 2022
  • Recently, automatic transmissions caused a good improvement in the shift quality of a forklift. An advanced shift control algorithm, which was based on TCU firmware, was applied with embedded control technology and microcontrollers. In the clutch-to-clutch shifting, one friction element is released and the other friction element is activated. During this process, if the release and application timings are not synchronized, an overrun or tie-up occurs and ultimately leads to a shift shock. The TCU, which measures only the speed of the forklift, inevitably applies the open-loop shift control. In this situation, the speed ratio does not change during the clutch fill. The torque phase occurs until the clutch is disengaged. In this study, an offline shift logic of the learning control was proposed. It induced a synchronous shift when the learning control progressed. During this process, the reference current trajectory of the release clutch was corrected and applied to the next upshift. We considered the results of the overrun/tie-up characteristics of the upshift performed immediately before. The vehicle test proved that the deviation in shift quality, which was caused by the difference in the mechanical characteristics of the clutch, could be improved by the learning control.

Soft Computing을 이용한 자동 변속 시스템 개발 (On Developing Automatic Transmission System Using Soft Computing)

  • 김창훈;서재용;김성주;김종수;최영길;전홍태
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2001년도 하계종합학술대회 논문집(3)
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    • pp.161-164
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    • 2001
  • This paper partially presents a Hierachical neural network architecture for providing the intelligent control of complex Automatic Transmission(A/T) system which is usually nonlinear and hard to model mathematically. It consists of the module to apply or release an engine brake at the slope and that to judge the intention of the driver. The HNN architecture simplifies the structure of the overall system and is efficient for the learning time. This paper describes how the sub-neural networks of each module have been constructed and will compare the result of the intelligent A/T control to that of the conventional shift pattern.

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Slip Control Strategy for an Automatic Transmission Vehicle

  • Lee, Chinwon;Kukhyun Ahn;Lee, Jang-Moo;Lim, Won-Sik
    • Journal of Mechanical Science and Technology
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    • 제17권4호
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    • pp.521-527
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    • 2003
  • Modern automatic transmissions equip torque converters with lock-up clutches to reduce the energy loss of hydraulic systems. Instead of simply engaging the clutch disks, the new technology of clutch slip has been developed to improve the overall efficiency of power transmission. There are two major problems with the clutch slip system. The first is how to keep the slip between the two disks within a small range and the second is when to start or stop the slip. In this paper, the second problem is discussed in view of the vehicle economy. With a simple vehicle dynamic model, the fuel economy is calculated to determine the lock-up strategy. Then the lock-up strategy is developed for a slip schedule.

비례제어방식 솔레노이드 밸브 압력제어특성에 관한 동적해석 (Dynamics Analysis of Pressure Control Characteristics in a Variable Pressure Solenoid Valve)

  • 김형만;태혁준;이현우;이창훈
    • 한국자동차공학회논문집
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    • 제11권6호
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    • pp.80-85
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    • 2003
  • In the present paper, dynamics analyses of pressure control characteristics have been performed in a variable pressure solenoid valve. A number of solenoid valves have been used in the electronic control system, especially automatic transmission of an automobile. Variable pressure solenoid valve is intended to produce spatial movement by the electrical signal. Dynamics analyses of pressure control characteristics have been practiced by the Finite Difference Method, which show the pressure distribution in the solenoid valve. The results of numerical analyses show the dependence of pressure distribution on the displacement of the spool in the solenoid valve, and then, are compared with the experimental results.

압력제어솔레노이드밸브를 이용한 직접구동 방식의 유압회로에 의한 자동변속기의 변속품질 향상에 관한 연구

  • 김정관;한명철
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1995년도 추계학술대회 논문집
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    • pp.577-580
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    • 1995
  • This paper suggests direct-acting hydraulic circuit to control clutches and brakes in automatic transmission. As only one pressure control valve controls the pressure of several friction elements with accumulators in conventional hydraulic circuit, the controllable range is limited. In addition, it is difficult to control the fine timing between apply clutch and release clutch. So, we designed new method to control the pressure of clutch which uses ressure control valve and pressure control solenoid valve independently in each friction element. through this structure improvement of hydraulic circuit, we can control the pressure of clutches and brakes finely and fine timing of between apply clutch and release clutch.

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