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Dynamic modeling of a SI/HCCI free-piston engine generator with electric mechanical valves

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  • Chiang, Chia-Jui
  • Yang, Jing-Long
  • Lan, Shao-Ya
  • Shei, Tsung-Wei
  • Chiang, Wen-Shu
  • Chen, Bo-Liang

Abstract

For the purpose of model-based analysis and control design, a dynamic physics-based model for free-piston engine generator (FPEG) is developed in this paper. The physics-based model contains 17 states, which include piston dynamics, alternator current, runners and cylinder gas filling dynamics and thermal dynamics. Homogeneous charge compression ignition (HCCI) combustion is employed for better efficiency and reduced emissions, whereas spark ignition (SI) combustion can be used for quick start of the FPEG and higher power demand. Equipped with electric mechanical valves (EMVs) and direct injection, the free-piston engine generator is deemed to achieve optimized and clean combustion. Key features in this dynamic model include the runners and cylinder filling dynamics and cycle-to-cycle coupling between the piston motion and combustion process. Simulation results demonstrate that during a transition from SI to HCCI mode, the scavenging process needs to be properly maintained so as to achieve trapped mass balance between the opposite cylinders and thus regulation of the compression ratio.

Suggested Citation

  • Chiang, Chia-Jui & Yang, Jing-Long & Lan, Shao-Ya & Shei, Tsung-Wei & Chiang, Wen-Shu & Chen, Bo-Liang, 2013. "Dynamic modeling of a SI/HCCI free-piston engine generator with electric mechanical valves," Applied Energy, Elsevier, vol. 102(C), pages 336-346.
    • Handle: RePEc:eee:appene:v:102:y:2013:i:c:p:336-346
    DOI: 10.1016/j.apenergy.2012.07.033
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    References listed on IDEAS

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    Cited by:

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    2. Michelangelo Balmelli & Norbert Zsiga & Laura Merotto & Patrik Soltic, 2020. "Effect of the Intake Valve Lift and Closing Angle on Part Load Efficiency of a Spark Ignition Engine," Energies, MDPI, vol. 13(7), pages 1-16, April.
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    4. Geng, Heming & Wang, Yang & Zhen, Xudong & Liu, Yu & Li, Zhiyong, 2018. "Study on adaptive behavior and mechanism of compression ratio (or piston motion profile) for combustion parameters in hydraulic free piston engine," Applied Energy, Elsevier, vol. 211(C), pages 921-928.
    5. Huihua Feng & Yu Song & Zhengxing Zuo & Jiao Shang & Yaodong Wang & Anthony Paul Roskilly, 2015. "Stable Operation and Electricity Generating Characteristics of a Single-Cylinder Free Piston Engine Linear Generator: Simulation and Experiments," Energies, MDPI, vol. 8(2), pages 1-21, January.
    6. Hung, Nguyen Ba & Lim, Ocktaeck, 2016. "A review of free-piston linear engines," Applied Energy, Elsevier, vol. 178(C), pages 78-97.
    7. Boru Jia & Zhengxing Zuo & Andrew Smallbone & Huihua Feng & Anthony Paul Roskilly, 2017. "A Decoupled Design Parameter Analysis for Free-Piston Engine Generators," Energies, MDPI, vol. 10(4), pages 1-14, April.
    8. Hung, Nguyen Ba & Lim, Ocktaeck & Iida, Norimasa, 2015. "The effects of key parameters on the transition from SI combustion to HCCI combustion in a two-stroke free piston linear engine," Applied Energy, Elsevier, vol. 137(C), pages 385-401.
    9. Jia, Boru & Smallbone, Andrew & Feng, Huihua & Tian, Guohong & Zuo, Zhengxing & Roskilly, A.P., 2016. "A fast response free-piston engine generator numerical model for control applications," Applied Energy, Elsevier, vol. 162(C), pages 321-329.
    10. Wu, Wei & Hu, Jibin & Yuan, Shihua, 2014. "Semi-analytical modelling of a hydraulic free-piston engine," Applied Energy, Elsevier, vol. 120(C), pages 75-84.
    11. Lim, Ocktaeck & Hung, Nguyen Ba & Oh, Seokyoung & Kim, Gangchul & Song, Hanho & Iida, Norimasa, 2015. "A study of operating parameters on the linear spark ignition engine," Applied Energy, Elsevier, vol. 160(C), pages 746-760.
    12. Guo, Chendong & Zuo, Zhengxing & Feng, Huihua & Jia, Boru & Roskilly, Tony, 2020. "Review of recent advances of free-piston internal combustion engine linear generator," Applied Energy, Elsevier, vol. 269(C).
    13. Zhang, Shuanlu & Zhao, Changlu & Zhao, Zhenfeng, 2015. "Stability analysis of hydraulic free piston engine," Applied Energy, Elsevier, vol. 157(C), pages 805-813.
    14. Ziwei Zhang & Huihua Feng & Zhengxing Zuo, 2020. "Numerical Investigation of a Free-Piston Hydrogen-Gasoline Engine Linear Generator," Energies, MDPI, vol. 13(18), pages 1-16, September.
    15. Chen, Leiming & Xu, Zhaoping & Liu, Shuangshuang & Liu, Liang, 2022. "Dynamic modeling of a free-piston engine based on combustion parameters prediction," Energy, Elsevier, vol. 249(C).

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