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김남웅(NamWoong Kim),박영일(Yeong-il Park),임원식(WonSik Lim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Due to the increase of the oil price, the needs for the fuel efficiency improvement of the vehicles are growing and as environmental problems like CO₂ emission be issues, many automotive companies have developed various new technologies to deal with those issues. Automated Manual Transmission(AMT) is one of those technologies. AMT, based on conventional manual transmission, uses various control units and actuators to automate the clutch actuation and gear shift. As manual transmission"s main clutch is applied to supply the power from the engine to transmission, compared to the torque converter applied to automatic transmission, AMT improves fuel efficiency and has better responsibility due to the varied shift mode. Also comparing to automatic transmission, it provides the same ease. This paper is to analyze heavy duty track applied AMT"s structure, performance characteristics, automated shifting. And compare the data from real vehicle experiments to study the responsibility of shifting control and stability.
김부성(Boosung Kim),윤정주(Jeongjoo Yun),장준우(Junwoo Jang),김영광(Youngkwang Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
This paper presents a design of AMT(automated manual transmission) system applied to the commercial hybrid vehicle. AMT system is based on the manual transmission and consists of clutch actuator, gear-shifting actuator, TCU and shift lever. AMT system has advantages about fuel consumption and driving convenience because the gear shifting is performed by the AMT system automatically like an automatic transmission. In this paper, it is analyzed that the requirements of AMT system and the components are designed and producted.
Oh, K.,Yun, S.,Ko, K.,Ha, S.,Kim, P.,Seo, J.,Yi, K. Elsevier ; Elsevier Science Pub. Co 2016 AUTOMATION IN CONSTRUCTION - Vol.69 No.-
This paper presents gear ratio and shift schedule optimization strategies to improve energy efficiency for the dynamic simulation of a wheel loader equipped with dual clutch transmission (DCT) and automated manual transmission (AMT). A conventional wheel loader uses torque converter (T/C) based automotive transmission, and the torque converter causes heavy energy loss during the V-pattern working cycle. To improve fuel economy while maintaining working performance in the V-pattern working cycle, automated manual transmission (AMT) and dual clutch transmission (DCT) have been suggested to substitute the clutch for the torque converter. In addition, the optimization strategies for the gear ratio and shift schedule for AMT and DCT have been proposed for improving fuel economy. Gear ratios have been determined by a nonlinear optimization method based on the standard V-pattern working cycle which is obtained from experimental test data by a skilled driver. Then, the gear-shift schedule for clutch-type transmission has been derived by using a determined gear ratio and optimization strategy. Simulations have been conducted to investigate working performance and energy efficiency by using three developed wheel loader simulation models equipped with T/C, AMT, and DCT, respectively, with the driver model for the V-pattern working cycle. Simulation results show that AMT- and DCT-based wheel loaders are more fuel efficient for the V-pattern working cycle than the T/C-based wheel loader.
An investigation of energy efficiency of a wheel loader with automated manual transmission
Kwangseok Oh,Seung Jae Yun,Kyungeun Ko,김판영,Jaho Seo,Kyongsu Yi 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
This paper describes an investigation of energy efficiency by applying an advanced powertrain system in a conventional wheel loader. A conventional powertrain of a wheel loader consists of an engine, torque converter and transmission. A torque converter in a conventional system generally causes a significant amount of energy loss, as determined by analyzing energy flow based on V-pattern working. To prevent energy loss in a torque converter, Automated manual transmission (AMT) was proposed and modeled in this paper as an advanced powertrain. A wheel loader based on AMT does not need to use a torque converter since the single clutch system is used between the engine and transmission with subsystems of engine controller, clutch actuator and controller. A simplified single clutch system and controller were constructed for V-pattern working of a wheel loader. Additionally, a PI-controller was used as a control algorithm for engine speed control to prevent energy loss while the clutch is not engaged. All simulation models have been constructed in the Matlab/Simulink environment, and simulation studies were conducted by using a simulation model of a wheel loader with a driver model based on V-pattern working. Simulation results of the AMT-based wheel loader were analyzed by comparison with the results of the torque converter-based wheel loader, and the results show that the AMT-based wheel loader is more energy efficient than the conventional wheel loader.
DEVELOPMENT OF AUTOMATIC CLUTCH ACTUATOR FOR AUTOMATED MANUAL TRANSMISSIONS
MOON S. E.,KIM H. S.,HWANG S. H. The Korean Society of Automotive Engineers 2005 International journal of automotive technology Vol.6 No.5
With the growing traffic density and increasing comfort requirements, the automation of the drive train has gained importance in vehicles. The automatic clutch actuation relieves a driver especially in urban and stop-and-go traffic environments. In this paper, an electro-mechanical actuator for clutch-by-wire (CBW) system is implemented as the first stage for the development of automated manual transmissions. The prototype of the automatic clutch actuator is designed systematically, which is composed of the electric motor, worm and worm wheel, and crank mechanism. A test rig is developed to perform the basic function test for the automatic clutch actuation. The developed prototype is validated by the experimental results performed on the test rig.
상용 하이브리드 차량의 자동화 수동 변속기 변속 로직 개발
이상원(Sangwon Lee),우재진(Jaejin Woo),김영광(Youngkwang Kim),남광수(Kwangsoo Nam) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper describes development of AMT(Automated Manual Transmission) shift control logic applied to the commercial HEV(Hybrid Electric Vehicle). Shift control algorithm is composed of shift sequence according to hybrid mode and collaborative control with HCU(Hybrid Control Unit), ECU(Engine Control Unit) and MG(Motor & Generator), position control of clutch & shift actuator. The proposed algorithm is proven to be successful by experiments performed vehicle.