ELECTRIC AND HYDRAULIC PROPEL TORQUE MODULATION FOR A COMPACT TRACK LOADER WITH THE HYBRID HYDRAULIC ELECTRIC ARCHITECTURE (HHEA)

Jackson Wills, Perry Y. Li

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

The Hybrid Hydraulic Electric Architecture (HHEA) has previously been proposed for off-highway vehicles to reap the efficiency and controllability benefits of electrification without needing very large electric motors. This is achieved with the use of a set of selectable common pressure rails to transmit the majority of power and small electric motors to modulate that power. Previous work has shown significant energy savings for the work circuits of a variety of machines. In this paper, the energy saving potential of HHEA for the propel circuit of a compact track loader is studied. The ports of the track hydraulic motors are selectably connected to the common pressure rails, and instead of using the electric assist motors to buck/boost pressure, as in HHEA for linear actuators, small electric assist motors are used to add/subtract torque directly. The interplay between the torque limits of the electric motors and the ability of the hydraulic motor to vary displacements is studied, along with the effect these factors have on energy saving potential. It is found that the ability to vary the displacement of the hydraulic motor allows for: more efficient electric motor operating conditions, reduced electric torque requirement, and reduced pressure rail switching events. All three of these advantages can be achieved at once using variable displacements; but trade-offs exist between these advantages (i.e. improved efficiency can be achieved at the expense of a larger electric torque requirement). Overall, the HHEA can reduce energy consumption by ∼ 36% compared to the stock machine, depending on the hydraulic motor’s ability to vary displacements, and assuming the electric motor torque is limited to 20% of that required in a direct electrification scheme.

Original languageEnglish (US)
Title of host publicationProceedings of ASME/BATH 2023 Symposium on Fluid Power and Motion Control, FPMC 2023
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791887431
DOIs
StatePublished - 2023
Externally publishedYes
Event2023 ASME/BATH Symposium on Fluid Power and Motion Control, FPMC 2023 - Sarasota, United States
Duration: Oct 16 2023Oct 18 2023

Publication series

NameProceedings of ASME/BATH 2023 Symposium on Fluid Power and Motion Control, FPMC 2023

Conference

Conference2023 ASME/BATH Symposium on Fluid Power and Motion Control, FPMC 2023
Country/TerritoryUnited States
CitySarasota
Period10/16/2310/18/23

Bibliographical note

Publisher Copyright:
Copyright © 2023 by ASME.

Keywords

  • Common Pressure Rails
  • Digital Hydraulics
  • HHEA
  • Mobile Machines

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