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Model Based Control for a Pressure Control Type CVT

Model Based Control for a Pressure Control Type CVT. Wansik Ryu, Juhyun Nam, Hyunsoo Kim, Sungkyunkwan University Yongjoon Lee, Hyundai Motor Company. Dynamic System Design & Control Lab. Sungkyunkwan University. Introduction. Flow Control Type. Pressure Control Type.

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Model Based Control for a Pressure Control Type CVT

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  1. Model Based Control for a Pressure Control Type CVT Wansik Ryu, Juhyun Nam, Hyunsoo Kim, Sungkyunkwan University Yongjoon Lee, Hyundai Motor Company Dynamic System Design & Control Lab. Sungkyunkwan University

  2. Introduction Flow Control Type Pressure Control Type • Pressure control is easier than the flow control in maintaining the desired CVT speed ratio. • Pressure control system has an advantage of preventing the belt from slippage in active manner.

  3. Purpose of Study • Design a ratio controller for pressure control type CVT • Design a model based controller • Investigate model based controlledCVT shift performance

  4. Pressure Control Type Ratio Control Valve Solenoid presusre Feed back pressure Spring force

  5. CVT System Dynamics Force equilibrium of the spool motion State equation of the primary pressure where CVT shift dynamics by Ide (1995)

  6. Pressure Characteristics at a Steady State

  7. P-line

  8. Prediction of Shift Performance by P-line Shift speed at B is the fastest among the three points, A, B and C

  9. Prediction of Shift Performance by P-line

  10. Experiments for Ratio Control Performance CVT Test rig

  11. Block Diagram of Ratio Control with PID Control

  12. Control Performance There exist small response lag in the CVT ratio response

  13. Ratio Response for Stepwise Input of Ps

  14. Steady State Pressure Characteristics with P-line Psol=3.5bar Psol=2.5bar

  15. Model Based Control

  16. Model Based Control

  17. Model Based Control

  18. Conclusion • A P-line is proposed from the steady state relationship between the primary pressure and secondary pressure • CVT shift performance is predicted using the P-line • Linear control algorithm such as PID type controller can be used for the pressure control type CVT • A model based control algorithm is proposed • The model based control is able to provide improved tracking performance and robustness

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