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Measurement And Control Of Slip In a Continuously Variable Transmission

Measurement And Control Of Slip In a Continuously Variable Transmission. B. Bonsen, T.W.G.L. Klaassen, K.G.O. van de Meerakker M. Steinbuch, P.A. Veenhuizen. CVT. Infinite number of ratios within a range Shifting while engaged Optimal use of IC engine. CVT. Slip. Friction drive

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Measurement And Control Of Slip In a Continuously Variable Transmission

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  1. Measurement And Control Of Slip In a Continuously Variable Transmission B. Bonsen, T.W.G.L. Klaassen, K.G.O. van de Meerakker M. Steinbuch, P.A. Veenhuizen

  2. CVT • Infinite number of ratios within a range • Shifting while engaged • Optimal use of IC engine

  3. CVT

  4. Slip • Friction drive • Slip between belt and pulley • Wear • Clamping force

  5. Efficiency • Actuation losses • Friction in Belt • Bearing losses • Lubrication

  6. Project goals • Optimize CVT transmission efficiency by: • using alternative actuation system • lowering clamping force

  7. Lowering clamping force • Advantage: • Less friction losses in the belt • Less actuation power • Less friction in the bearings • More torque on the wheels • Disadvantage: • Increased risk of damage due to slip

  8. Measurement of slip • Definition of slip • Measurement of • Calculation of

  9. Testrig

  10. Slip & Efficiency

  11. Slip & Friction

  12. Linearizing

  13. Variator model

  14. Nonlinear model

  15. Linearized model

  16. Eigenfrequencies

  17. Control • Clamping force • Ratio • Speed

  18. T d p + F r e f s r - g Slip feedback

  19. Clamping force • Safety • Actuation bandwidth • Slip measurement

  20. Stability using slip feedback

  21. Experimental Results

  22. Conclusions • Stable control of slip • Robustness for torque peaks up to 30Nm • Lower clamping force (-30%) • Higher variator efficiency (+4%)

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