A rotary fluid power converter for improving energy efficiency of hydraulic system with variable load

Guoheng Wu, Junhong Yang, Jianzhong Shang and Delei Fang

Energy, 2020, vol. 195, issue C

Abstract: Due to throttling losses, the variable load hydraulic servo system based on traditional valve control is less efficient. In this paper, a rotary fluid power converter (RFPC) is designed for improving the efficiency of hydraulic energy in mobile hydraulic robots and other hydraulic systems with variable load. The mechanism of RFPC is validated via simulation, based on MATLAB/Simulink. The RFPC can change the output pressure or flow to meet the hydraulic system load without throttling control, it regulates the output hydraulic energy by controlling energy conversion processes. The working principle of RFPC is similar to the transformation principle of boost electronic transformer. The transformer is based on the principle of electromagnetic induction for voltage regulation, while the RFPC is based on hydraulic-mechanical energy conversion. The rotary fluid power converter is controlled by pulse-width modulation (PWM) wave, and the output pressure or output flow rate of the RFPC can be adjusted by changing the duty cycle of the control signal. The MATLAB/Simulink model of the rotary fluid power converter is built to analyze its performance and energy efficiency. The simulation shows that the novel RFPC has a higher working efficiency than the traditional throttling control in most cases.

Keywords: Rotary fluid power converter; Hydraulic transformer; Energy efficient; Mobile hydraulic system (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:195:y:2020:i:c:s0360544220300645

DOI: 10.1016/j.energy.2020.116957

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