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Torsional oscillation-considered mode transition coordinated control for a power-split PHEV based on action dependent

Feng Wang1, Jian Zhang2, Xing Xu2

  • 1Automotive Engineering Research Institute, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu Province, China; State Key Laboratory of Engines, Tianjin University, 92 Weijin Road, Tianjin, China.

ISA Transactions
|August 2, 2021
PubMed
Summary

This study introduces a coordinated control strategy to improve Plug-in Hybrid Electric Vehicle (PHEV) comfort during mode transitions. The new method reduces gear oscillations and vehicle jerk for a smoother driving experience.

Keywords:
Angle-varying mesh stiffnessEngine start-upHybrid electric vehiclesMode transition coordinated controlSuppression of torsional oscillation

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Area of Science:

  • Automotive Engineering
  • Control Systems
  • Mechanical Vibrations

Background:

  • Mode transitions in Plug-in Hybrid Electric Vehicles (PHEVs) from electric to hybrid modes can negatively impact occupant comfort.
  • Transient torsional oscillations of gears (TTOGs) and vehicle jerk are key factors contributing to this discomfort.

Purpose of the Study:

  • To develop a coordinated control strategy for PHEV mode transition process (MTP) that considers torsional oscillations.
  • To introduce a novel general evaluation index for MTP quality.
  • To comprehensively address both MTP quality and TTOGs.

Main Methods:

  • A torsional oscillation-considered mode transition coordinated control strategy was developed.
  • A novel general evaluation index for MTP was created.
  • An action-dependent heuristic dynamic programming algorithm was employed to optimize clutch oil pressure and motor compensation torque, using vehicle jerk, friction loss, and TTOGs as evaluation metrics.

Main Results:

  • The developed strategy effectively suppresses vehicle jerk and TTOGs during the electric-to-hybrid electric mode transition (EM-to-HM).
  • Simulation results and hardware-in-the-loop tests validated the strategy's performance.
  • Significant improvements in driving comfort were observed.

Conclusions:

  • The proposed coordinated control strategy enhances PHEV occupant comfort during mode transitions.
  • The strategy successfully mitigates transient torsional oscillations of gears and vehicle jerk.
  • This research offers a viable solution for improving the driving experience in PHEVs.