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Feedback Shift Controller Design of Automatic Transmission for Tractors
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  • Journal title : Journal of Drive and Control
  • Volume 13, Issue 1,  2016, pp.1-9
  • Publisher : Korea Society of Fluid Power & Construction Equipments
  • DOI : 10.7839/ksfc.2016.13.1.001
 Title & Authors
Feedback Shift Controller Design of Automatic Transmission for Tractors
Jung, Gyu Hong; Jung, Chang Do; Park, Se Ha;
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Nowadays automatic transmission equipped vehicles prevail in construction and agricultural equipment due to their convenience in driving and operation. Though domestic vehicle manufacturers install imported electronic controlled transmissions at present, overseas products will be replaced by domestic ones in the near future owing to development efforts over the past 10 years. For passenger cars, there are many kinds of shift control algorithms that enhance the shift quality such as feedback and learning control. However, since shift control technologies for heavy duty vehicles are not highly developed, it is possible to improve the shift quality with an organized control method. A feedback control algorithm for neutral-into-gear shift, which is enabled during the inertia phase for the master clutch slip speed to track the slip speed reference, is proposed based on the power transmission structure of TH100. The performance of the feedback shift control is verified by a vehicle test which is implemented with firmware embedded TCU. As the master clutch engages along the predetermined speed trajectory, it can be concluded that the shift quality can be managed by a shift time control parameter. By extending the proposed feedback algorithm for neutral-into-gear shift to gear change and shuttle shift, it is expected that the quality of the shift can be improved.
Automatic Transmission;TCU;Feedback Shift Control;Slip Speed;Shift Quality;Tractor;
 Cited by
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G. H. Jung, C. D. Jung and S. H. Park, "Calibration Method for Clutch Fill Phase Shift Data in Automatic Transmission", 2015 Spring Conference on Drive and Control, pp.133-139, 2015.

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HYDAC, 3-Way Proportional Pressure Reducing Valve Speel Type PDMC05S30A-50 datasheet, 2013.

Fereydoon Jamzadeh, Tung-Ming Hsieh and Keith Struthers, "Dynamic Simulation Model- ing for Heavy Duty Automatic Transmission Control Development", SAE922441, 1992.

G. H. Jung and K. I. Lee, "A Research on Shifting Controller Development of a Automatic Transmission for Construction Vehicles", Transactions of KSAE, Vol. 10, No. 2, pp.234-242, 2002.