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TECHNICAL PAPERS

Optimizing the Smoothness and Temperatures of a Wet Clutch Engagement Through Control of the Normal Force and Drive Torque

[+] Author and Article Information
Mikael Holgerson

Division of Machine Elements, Luleå University of Technology, SE-97187 Luleå, Sweden

J. Tribol 122(1), 119-123 (May 25, 1999) (5 pages) doi:10.1115/1.555334 History: Received January 12, 1999; Revised May 25, 1999
Copyright © 2000 by ASME
Topics: Force , Torque , Temperature , Gears
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References

Miyeshi,  T., 1991, “Friction Characteristics of Paper Based Friction Materials,” Jpn. J. Tribol. 36, pp. 1385–1390.
Hopkins, A. G., and Anderson, J. N., 1983, “Effect of Commercial Oil Additives on Wet Friction Systems,” SAE technical paper 831312, pp. 1–12.
Ibamoto, M., Kuroiwa, H., Minowa, T., Sato, K., and Tsuchiya, T., 1995, “Development of Smooth Shift Control System with Output Torque Estimation,” SAE technical paper 950900, pp. 163–168.
Kondo, T., Iwatsuki, K., Taga, Y., Tanguchi, T., and Taniguchi, T., 1990, “Toyota “ECT-i” a New Automatic Transmission with Intelligent Electric Control System,” SAE technical paper 900550, pp. 706–716.
Osanai, H., Ikeda, K., and Kato, K., 1990, “Relations Between Temperature in Friction Surface and Degradation of Friction Materials During Engaging of Wet Friction Paper,” SAE technical paper 900553, pp. 1–8.
Holgerson,  M., 1997, “Apparatus for Measurement of Engagement Characteristics of a Wet Clutch,” Wear, 213, pp. 140–147.

Figures

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Engine speed and vehicle drive torque in a typical up-shift of an automatic transmission passenger car
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Schematic drawing of the test rig
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Reference engagement without force or drive torque control
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Engagement with normal force control at the end of the engagement
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Engagement with the drive torque shut off during the engagement
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Engagement with the drive torque shut off and a smaller normal force
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Optimized engagement with the drive torque shut off, lower normal force and a force ramp at the end of the engagement
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Comparison between the torque curves from the reference engagement and from the optimized engagement
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Comparison between the temperature curves from the reference engagement and from the optimized engagement
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Comparison between the power curves from the reference engagement and from the optimized engagement

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