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Slip control strategy for an automatic transmission vehicle

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Abstract

Modern automatic transmissions equip torque converters with lock-up clutches to reduce the energy loss of hydraulic systems. Instead of simply engaging the clutch disks, the new technology of clutch slip has been developed to improve the overall efficiency of power transmission. There are two major problems with the clutch slip system. The first is how to keep the slip between the two disks within a small range and the second is when to start or stop the slip. In this paper, the second problem is discussed in view of the vehicle economy. With a simple vehicle dynamic model, the fuel economy is calculated to determine the lock-up strategy. Then the lock-up strategy is developed for a slip schedule.

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Abbreviations

C:

Capacity factor, Nm/rad2/s2

I:

Inertia moment of rotation, kg-m2

sr:

Speed ratio

tr:

Torque ratio

αβ:

Reduction gear ratio

ω:

Rotational velocity, rad/s

φ:

Throttle opening,%

()e :

Engine

( )v :

Vehicle

()c :

Clutch

()p :

Pump

()t :

Turbine

References

  • Frank, P., 2000, “Slip Control at Small Slip Values for Road Vehicle Brake Systems,” Periodica Polytechnical Mechanical Engineering, Vol. 44, No. 1, pp. 23–30.

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  • Hiramatsu, T.. 1985, “Control Technology of Minimal Slip-Type Torque converter Clutch,” SAE Technical Paper, 850460

  • Katsumi, K., 1996, “Lockup Clutch Slip Control System for Automatic Transmissions,” JSAE Review, Vol. 17, No. 1, pp. 85–91.

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  • Lew, JiannShium, 1996. “Torque Converter Clutch Slip Control with Friction Uncertainty,” SAE Technical Paper, 960432

  • Lee, Chinwon, 1998, “Experimental Study on Hydraulic Torque Converter for Automatic Transmission,” Master’s Thesis, Seoul Nat’l University

  • Yamada. N. and Ando, K., 1995, “An Analysis of Clutch Self-Excited Vibration jn Automotive Drive Line,” SAE Technical Paper, 951319

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Authors and Affiliations

  1. Seoul National University, 136-2037, Kwanakgu, Shinlim-dong, San 56-1, 151-742, Seoul, Korea

    Chinwon Lee, Kukhyun Ahn & Jang Moo Lee

  2. Department of Automotive Engineering, Seoul National University of Technology, Kwanakgu, Shinlim-dong, San 56-1, 151-742, Seoul, Korea

    Won Sik Lim

Authors
  1. Chinwon Lee
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  2. Kukhyun Ahn
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  3. Jang Moo Lee
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  4. Won Sik Lim
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Corresponding author

Correspondence to Chinwon Lee.

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Lee, C., Ahn, K., Lee, J.M. et al. Slip control strategy for an automatic transmission vehicle. KSME International Journal 17, 521–527 (2003). https://doi.org/10.1007/BF02984453

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  • DOI: https://doi.org/10.1007/BF02984453

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