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Improvement of Energy Regeneration for Hydraulic Excavator Swing System

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Abstract

A novel energy regeneration swing system is proposed for hydraulic excavator in this paper to reduce the energy consumption. Two independent accumulators are proposed for use in the hybrid swing system. The combined control of hydraulic motor displacement and flow control valve and a variable accumulator control strategy were proposed to improve the energy regeneration efficiency and ensure the system performance. A testbench was set up, and experiments were conducted. The experiment verified that the energy regeneration efficiency of the proposed system ranged from 23 to 56% in different conditions.

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Abbreviations

J :

Moment of inertia of the flywheel

ω :

The speed of the flywheel

T f :

Coulomb friction torque

T w :

Torque of wind resistance

T dec :

Deceleration torque of the hydraulic motor

p ho :

Pressure of the output side of the hydraulic motor

D :

Displacement of the hydraulic motor

η m :

Torque efficiency of the hydraulic motor

Q a :

Flow rate through FCV

p a :

Pressure of the output port of the orifice

A :

Orifice area of the valve

C d :

Flow coefficient

ρ :

Density of the hydraulic oil

V1:

The volume of the chamber

βe:

The effective bulk modulus of the hydraulic oil

Qh:

The flow form the hydraulic motor

u m :

Control signal of the hydraulic motor displacement

u v :

Control signal of the FCV

D max :

The maximum hydraulic motor displacement

Dr:

Reference hydraulic motor displacement

α :

Displacement ratio

α r :

Reference displacement ratio

ω :

Speed of the flywheel

E reg :

Regenerated energy

Q acc :

Flow rate and of accumulator

p acc :

Pressure of accumulator

p g :

Pressure of the gas in accumulator

V g :

Volume of the gas in accumulator

n:

Adiabatic exponent

E FW :

Kinetic energy of the flywheel

η reg :

Energy regeneration efficiency

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Acknowledgements

This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF-2017R1A2B3004625) and supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry and Energy. (G032070311).

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Authors and Affiliations

  1. Graduate School of Mechanical and Automotive Engineering, University of Ulsan, San 29, Muger 2dong, Nam-gu, Ulsan, 680-764, South Korea

    Ying-Xiao Yu

  2. School of Mechanical Engineering, University of Ulsan, San 29, Muger 2dong, Nam-gu, Ulsan, 680-764, South Korea

    Kyoung Kwan Ahn

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Yu, YX., Ahn, K.K. Improvement of Energy Regeneration for Hydraulic Excavator Swing System. Int. J. of Precis. Eng. and Manuf.-Green Tech. 7, 53–67 (2020). https://doi.org/10.1007/s40684-019-00165-7

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