Active Disturbance Rejection Control for Double-Pump Direct-Driven Hydraulics

Zhang, Shuzhong; Wu, Angen

doi:10.3390/iecat2020-08497

Cited by 1 publication

(1 citation statement)

References 19 publications

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“…Therefore, either excess or low flow rate is continuously created in the closed-circuit [5,71]. There are several solutions for the unbalanced flow rates compensation problem: (I) use of multiple pumps [72,73], (II) a single pump combined compensating valves (Pilot operated check valves [74], 3/3 shuttle valves [75], or on/off solenoid valves [76]) and (III) Asymmetric pumps [77]. [78][79][80][81][82][83] (Continued) The self-contained system (Only consumes energy when motion is demanded) shows better energy efficiency as opposed to the valve-controlled cylinders, which employ pressure-compensated proportional directional control valves (PDCV)s and counter-balance valves [80].…”

Section: Pressure Controlmentioning

confidence: 99%

A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study

Elsaed,

Linjama

2023

TJFP

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Hydraulic systems have been widely used due to their high power-to-weight ratio. Despite the growing instances of being superseded by the electromechanical counterparts at low power levels, the market was incapable of presenting alternatives for large-size applications. Additionally, in recent years, the demand for more significant heavy machinery (Mobile & Industrial) has increased, which led to the necessity of even higher flow and pressure Pilot-operated valves, despite the fact that these valves have several issues. One might think the alternative could be developing a hydraulic system that does not rely on Pilot-operated valves, but after decades of research, these systems could not get close to the performance of Pilot-operated Multistage valves. The paper presents a comprehensive study of the progress accomplished from the year 2016 to early 2022 in hydraulic Pilot-operated valves; they are widely employed among ordinary valves, proportional valves, and state-of-the-art digital hydraulics. Higher efficiency will be a primary factor in the success of the new designs. The academia presented several studies to improve the Pilot valves’ performance, but still, they are limited. There are no dramatic developments, and there are only a few upgrades.

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