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The Hydraulic System Modeling and Analysis of the Clutch Direct Control of an Automatic Transmission for a Forklift Truck  

Oh, Joo-Young (Department of Mechanical design & Mechatronics Engineering, Hanyang Univ.)
Lee, Guen-Ho (System Engineering Research Division, KIMM)
Song, Chang-Sub (Department of Mechanical Engineering, Hanyang Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.26, no.1, 2009 , pp. 112-119 More about this Journal
Abstract
An automatic transmission of construction equipment is controlled by hydraulic and electronic system for doing in various functions like as shifting and operation. The shifting is operated by the engaged and disengaged clutch motion from hydraulic power. On the shifting process, suitable pressure control to the clutch is required for smooth shifting. Hydraulic control system in the automatic transmission is divided by the pilot control type and the direct control type greatly. The direct control type has an advantage than the pilot control type. Because the structure is simple, the design and the manufacture are having less troubles and the system can be maximized precision pressure control. However, the excellent performance proportional control valve should be used to achieve proper control-ability. In this study, the dynamic analysis model composing the automatic transmission and hydraulic system for forklift truck is presented to simulate the characteristics of hydraulic system about the direct control type. That model is verified the validity compared the results of the testing examination. Parameters of input signal are analyzed to reduce the output torque according to input control signal is affected in shifting characteristic.
Keywords
Forklift Truck; Automatic Transmission; Clutch Pack; Proportional Control Valve; Clutch Direct Control Type;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Hiramatsu, T. and Naruse, T., "Shift quality control of an electronically controlled four speed automatic transmission," SAE Paper, No. 865149, 1986
2 Hur, J. Y., "Development and Analysis of Automatic Transmission Hydraulic System using a Directly Driven Clutch Circuit," Department of mechanical design, M.S thesis, Seoul National University, 2002
3 Hyundai-motor, "Design theory of automatic transmission," Hyundai-motor Press, pp. 4.1-7.48,1995
4 Jung, G. H. and Lee, G. H., "A development of forklift shift controller for dynamometer test," Proc. of the KFPS Spring conference, pp. 143-149, 2007
5 Yun, U. K., Lee, G. H., Lee, J. H., Jung, G. H. and Song, C. S., "The Shift Control Algorithm Modeling and Analysis of Automatic Transmission for WheelLoader," Proc. of KSPE Spring Conference, pp. 131- 132, 2007   과학기술학회마을
6 MSC. Easy5, "Hydraulic library user guide," MSC. software, 2002
7 Fitch, E. C. and Hong, I. T., "Hydraulic engineering- Hydraulic component design and selection," Taehun press, pp. 309-312, 2000
8 Jung, G. H. and Lee, K. I., ' Research on Shifting Controller Development of a Automatic Transmission for Construction Vehicles,' Transactions of KSAE, Vol. 10, No. 2, pp. 234-242, 2003   과학기술학회마을
9 Usuki, K., Fujita, K. and Hatta, K., "The INVECS-II Electronically Controlled Automatic Transaxles for FWD Passenger Cars," SAE Paper, No. 960429, 1996