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Dual-loop segmented piston trajectory control of free piston linear generator based on sliding mode control

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  • Cheng, Yingdong
  • Li, Jiaqi
  • Xiao, Jin
  • Zhang, Chen
  • Zhu, Lei
  • Huang, Zhen

Abstract

Free piston linear generator (FPLG) can be applied as range extender for electrical vehicles to reduce greenhouse gas emissions attributed to its fuel flexibility and ultimate freedom of piston motion. However, FPLG still faces several challenges in control such as misfire and collision due to the eliminate of mechanical crankshaft. To fully utilize the potential of the ultimate freedom of piston motion, this paper presents a novel piston trajectory control strategy which employs the piston trajectory on the entire operation process of FPLG as the control objective. Considering disturbances and high coupling of FPLG, a sliding mode controller is employed to track reference piston trajectory. Additionally, a segmented control strategy is implemented to decouple the control of combustion pressure force and electromagnetic force. In order to ascertain the effectiveness of the proposed controller, a prototype of single-piston FPLG and a corresponding numerical model are constructed. The experimental and simulation results demonstrate the proposed controller shows fast response, precise tracking performance, and good robustness at various reference piston trajectories. Furthermore, the experimental results illustrate that the system can achieve cold start through the seamless transition between operation states and long-term stable operation by the controller.

Suggested Citation

  • Cheng, Yingdong & Li, Jiaqi & Xiao, Jin & Zhang, Chen & Zhu, Lei & Huang, Zhen, 2024. "Dual-loop segmented piston trajectory control of free piston linear generator based on sliding mode control," Energy, Elsevier, vol. 313(C).
    • Handle: RePEc:eee:energy:v:313:y:2024:i:c:s0360544224034625
    DOI: 10.1016/j.energy.2024.133684
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    References listed on IDEAS

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