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Regenerative Braking Algorithm For a HEV with CVT Ratio Control During Deceleration

Regenerative Braking Algorithm For a HEV with CVT Ratio Control During Deceleration. Hoon Yeo, Donghyun Kim, Sungho Hwang, Hyunsoo Kim Sungkyunkwan University. Dynamic System Design & Control Lab. Sungkyunkwan University. Introduction. Motor. Transmission. Generator. IC Engine. +. -.

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Regenerative Braking Algorithm For a HEV with CVT Ratio Control During Deceleration

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  1. Regenerative Braking Algorithm For a HEV with CVT Ratio Control During Deceleration Hoon Yeo, Donghyun Kim, Sungho Hwang, Hyunsoo Kim Sungkyunkwan University Dynamic System Design & Control Lab. Sungkyunkwan University

  2. Introduction Motor Transmission Generator IC Engine + - Battery Regenerative Braking

  3. Traction and Braking Energy Consumption

  4. REGEN BRAKING FRICTION BRAKING + • the regenerative braking force is not large enough to cover the required braking force • the regenerative braking can not be used for many reasons such as high state of charge or high temperature of the battery to increase the battery life

  5. Objectives • Develop a regenerative braking control algorithm • Develop a prototype electro-hydraulic controlled regenerative braking module • Propose a CVT ratio control algorithm to obtain maximum regenerative energy during deceleration

  6. + - Battery Hybrid Electric Vehicle REGEN Hydraulic Module Motor & Generator Inverter Pedal Engine MCU BCU HEV-ECU

  7. Regenerative Braking Hydraulic Module

  8. i N T • • REG = T W W  1 2 R Regenerative Braking Algorithm Regenerative torque applied to the front wheel = W W (SOC) 1 1 = W W (Velocity) 2 2

  9. Weight Factor for Regenerative Braking

  10. Regenerative Braking Algorithm Regenerative braking force Hydraulic braking force required at the front wheel Ff HYD = Fbf – FREGEN Front wheel cylinder pressure equivalent to FfHYD

  11. Braking Forces on the Front and Rear Wheel

  12. F bfFRICTION Flow Chart for Regenerative Braking Yes No F > F bf REGEN Battery SOC, Pedal input Velocity, Regenerative braking CVT ratio Regenerative braking + Rear pressure Friction braking Friction braking Regenerative torque, Rear braking force P = 0 T F = F - F REGEN F bfFRICTION bf REGEN iNT Ideal distribution of braking force = REGEN T W W R 1 2  R F F = F t bfFRICTION = p bf REGEN f  2 rA Front braking force, F bf b Regenerative force F REGEN Hydraulic module

  13. CVT Ratio Control Motor efficiency

  14. CVT Ratio Control Optimal operating line in regenerative braking

  15. CVT Ratio Control Flow chart of CVT ratio control

  16. HEV Powertrain Model

  17. Vehicle Data

  18. Simulation Results

  19. Simulation Results

  20. Simulation Results Motor Operation Trajectories for FUDS

  21. Simulation Results Comparison of fuel economy and final battery SOC for FUDS

  22. Conclusion • Regenerative braking algorithm is proposed. • Prototype electro-hydraulic regenerative braking module is developed. • CVT ratio control algorithm during deceleration is suggested. • Fuel economy is improved by 4 percent for FUDS

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