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Energy Savings in Hydraulic Hybrid Transmissions through Digital Hydraulics Technology

Author

Listed:
  • Israa Azzam

    (School of Engineering Technology, Purdue University, West Lafayette, IN 47906, USA)

  • Keith Pate

    (School of Engineering Technology, Purdue University, West Lafayette, IN 47906, USA)

  • Jose Garcia-Bravo

    (School of Engineering Technology, Purdue University, West Lafayette, IN 47906, USA)

  • Farid Breidi

    (School of Engineering Technology, Purdue University, West Lafayette, IN 47906, USA)

Abstract

Hydraulic hybrid drivetrains, which are fluid power technologies implemented in automobiles, present a popular alternative to conventional drivetrain architectures due to their high energy savings, flexibility in power transmission, and ease of operation. Hydraulic hybrid drivetrains offer multiple environmental benefits compared to other power transmission technologies. They provide heavy-duty vehicles, e.g., commercial transportation, construction equipment, wagon handling, drilling machines, and military trucks, with the potential to achieve better fuel economy and lower carbon emissions. Despite the preponderance of hydraulic hybrid transmissions, state-of-the-art hydraulic hybrid drivetrains have relatively low efficiencies, around 64% to 81%. This low efficiency is due to the utilization of conventional variable displacement pumps and motors that experience high power losses throughout the drive cycle and thus fail to maintain high operating efficiency at lower volumetric displacements. This work proposes and validates a new methodology to improve the overall efficiency of hydraulic hybrid drivetrains by replacing conventional pump/motor units with their digital counterparts. Compared to conventional pump/motors, the digital pump/motor can achieve higher overall efficiencies at a wide range of operating conditions. A proof-of-concept digital pump/motor prototype was built and tested. The experimental data were integrated into a multi-domain physics-based simulation model of a series hydraulic hybrid transmission. The proposed methodology permits enhancing the overall efficiency of a series hydraulic hybrid transmission and thus allows for energy savings. Simulating the system at moderate load-speed conditions allowed achieving a total efficiency of around 89%. Compared to the average efficiency of the series hydraulic hybrid drivetrains, our simulation results reveal that the utilization of the state-of-the-art digital pump enables improving the total efficiency of the series hydraulic hybrid drivetrain by up to 25%.

Suggested Citation

  • Israa Azzam & Keith Pate & Jose Garcia-Bravo & Farid Breidi, 2022. "Energy Savings in Hydraulic Hybrid Transmissions through Digital Hydraulics Technology," Energies, MDPI, vol. 15(4), pages 1-24, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:4:p:1348-:d:748363
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    References listed on IDEAS

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    1. Andrea Vacca, 2018. "Energy Efficiency and Controllability of Fluid Power Systems," Energies, MDPI, vol. 11(5), pages 1-6, May.
    2. Kwon, Hyukjoon & Sprengel, Michael & Ivantysynova, Monika, 2016. "Thermal modeling of a hydraulic hybrid vehicle transmission based on thermodynamic analysis," Energy, Elsevier, vol. 116(P1), pages 650-660.
    3. Joanna Fabis-Domagala & Mariusz Domagala & Hassan Momeni, 2021. "A Concept of Risk Prioritization in FMEA Analysis for Fluid Power Systems," Energies, MDPI, vol. 14(20), pages 1-16, October.
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    5. Jia-Shiun Chen, 2015. "Energy Efficiency Comparison between Hydraulic Hybrid and Hybrid Electric Vehicles," Energies, MDPI, vol. 8(6), pages 1-27, May.
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    1. Mirosław Przybysz & Marian Janusz Łopatka & Arkadiusz Rubiec & Piotr Krogul & Karol Cieślik & Marcin Małek, 2022. "Influence of Hydraulic Drivetrain Configuration on Kinematic Discrepancy and Energy Consumption during Obstacle Overcoming in a 6 × 6 All-Wheel Hydraulic Drive Vehicle," Energies, MDPI, vol. 15(17), pages 1-21, September.

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