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Energy efficiency modelling and experimental analysis of double-variable hydraulic transformer

Author

Listed:
  • Li, Yanrui
  • Shen, Wei
  • Ma, Chenjun
  • Jing, Dalei
  • Cui, Ge

Abstract

As a key component of the Common Pressure Rail (CPR) hydraulic system, the double-variable hydraulic transformer (DVHT) regulates pressure and recovers energy, thereby avoiding inefficiency zones at low speeds and resulting in significant improvements in system efficiency. However, optimizing its efficiency is impeded by the absence of an efficiency quantification method under actual operating conditions. To address this issue, this study proposes a DVHT efficiency calculation model based on operating power. In this model, the cylinder rotational speed is treated as a dependent variable influenced by multiple coupled factors, and the oil leakage of the valve plate pair is taken into account. Experimental validation demonstrates that the model accurately reflects the efficiency and speed characteristics of the DVHT, with a peak efficiency deviation below 5 %. This research lays the groundwork for optimizing DVHT efficiency and supports the development of more energy-efficient CPR hydraulic systems.

Suggested Citation

  • Li, Yanrui & Shen, Wei & Ma, Chenjun & Jing, Dalei & Cui, Ge, 2025. "Energy efficiency modelling and experimental analysis of double-variable hydraulic transformer," Renewable Energy, Elsevier, vol. 254(C).
    • Handle: RePEc:eee:renene:v:254:y:2025:i:c:s0960148125013631
    DOI: 10.1016/j.renene.2025.123701
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    References listed on IDEAS

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