Clutch shift control is critical for the performance and fuel economy of automotive transmissions, including both automatic and hybrid transmissions. Among all the factors that influence clutch shift control, clutch fill and clutch engagement are crucial to realize a fast and smooth clutch shift. When the clutch is not engaged, the fluid held by the centrifugal force inside of the clutch chamber, which introduces additional pressure that will affect the subsequent clutch fill and engagement processes, should be released. To realize this function, a ball capsule system is introduced and mounted on the clutch chamber. When the clutch chamber is ready to be filled for engagement, the ball capsule needs to close quickly and remain closed until the clutch is disengaged. It is also desirable to have an appropriate closing velocity for the ball capsule to minimize noise and wear. In this paper, the ball capsule dynamics is modeled, in which the derivation of the ball capsule throttling area is considered novel and critical because of its asymmetrical nature. Through this, the ball capsule’s intrinsic positive feedback structure is also revealed, which is considered to be the key to realize a fast response. Moreover, through the system dynamics analysis, the slope angle of the capsule is found to be an effective control parameter for system performance and robustness. To this end, the optimal shape of the capsule is designed using dynamic programming to achieve the desired performance.
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March 2010
Research Papers
Modeling, Analysis, and Optimal Design of the Automotive Transmission Ball Capsule System
Xingyong Song,
Xingyong Song
Department of Mechanical Engineering,
University of Minnesota
, Twin Cities Campus, Minneapolis, MN 55455
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Mohd Azrin Mohd Zulkefli,
Mohd Azrin Mohd Zulkefli
Department of Mechanical Engineering,
University of Minnesota
, Twin Cities Campus, Minneapolis, MN 55455
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Zongxuan Sun,
Zongxuan Sun
Department of Mechanical Engineering,
University of Minnesota
, Twin Cities Campus, Minneapolis, MN 55455
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Hsu-Chiang Miao
Hsu-Chiang Miao
Research and Development Center,
General Motors Corporation
, Warren, MI 48090
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Xingyong Song
Department of Mechanical Engineering,
University of Minnesota
, Twin Cities Campus, Minneapolis, MN 55455
Mohd Azrin Mohd Zulkefli
Department of Mechanical Engineering,
University of Minnesota
, Twin Cities Campus, Minneapolis, MN 55455
Zongxuan Sun
Department of Mechanical Engineering,
University of Minnesota
, Twin Cities Campus, Minneapolis, MN 55455
Hsu-Chiang Miao
Research and Development Center,
General Motors Corporation
, Warren, MI 48090J. Dyn. Sys., Meas., Control. Mar 2010, 132(2): 021003 (12 pages)
Published Online: February 2, 2010
Article history
Received:
December 21, 2008
Revised:
October 12, 2009
Online:
February 2, 2010
Published:
February 2, 2010
Citation
Song, X., Zulkefli, M. A. M., Sun, Z., and Miao, H. (February 2, 2010). "Modeling, Analysis, and Optimal Design of the Automotive Transmission Ball Capsule System." ASME. J. Dyn. Sys., Meas., Control. March 2010; 132(2): 021003. https://doi.org/10.1115/1.4000662
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