Review of Flow-Matching Technology for Hydraulic Systems

Li, Ruichuan; Sun, Qiyou; Ding, Xinkai; Zhang, Yisheng; Yuan, Wentao; Wu, Tong

doi:10.3390/pr10122482

Cited by 9 publications

(3 citation statements)

References 31 publications

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“…Additionally, the system self-adaptively realizes the flow supply and demand matching, and the load flow is only related to the directional control valve's spool displacement. As a result, the load-sensitive system, which is extensively employed in construction machines [1][2][3][4] and marine machines [5,6], has strong energy-saving and control properties.…”

Section: Introductionmentioning

confidence: 99%

An Electro-Hydraulic-Load-Sensitive System on the Basis of Torque Open-Loop Control

Li,

Yu,

Chen

et al. 2023

Processes

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Facing the development trend of electrification of construction machinery, in view of the drawbacks of the existing electro-hydraulic-load-sensitive system in terms of dynamic characteristics and usage of energy, based on the drive source of a servo motor-driven quantitative pump, an electro-hydraulic-load-sensitive system on the basis of torque open-loop control was proposed. Firstly, the working principle of the system was introduced and the system’s operating characteristics and energy consumption characteristics were theoretically analyzed. Secondly, in order to balance the system’s energy usage and maneuverability, a control strategy with a variable pressure margin was designed. Meanwhile, in order to solve the problem that the hydraulic pump’s mechanical efficiency causes system pressure control deviation, a torque compensation method based on offline data and speed prediction was proposed. Finally, simulation and testing were used to confirm the viability of the control strategy. The test results show that: the system could realize stable pressure margin control, and the response rise time was within 0.7 s under a variety of flow circumstances; the system could follow the control instruction to change linearly and the flow rate changed smoothly in the adjustable pressure gap control; after using the compensation method, the deviation of the pressure gap control was within 2%.

show abstract

Section: Introductionmentioning

confidence: 99%

An Electro-Hydraulic-Load-Sensitive System on the Basis of Torque Open-Loop Control

Li,

Yu,

Chen

et al. 2023

Processes

View full text Add to dashboard Cite

show abstract

“…Experimental work demonstrated the improved performance of their design. Imam et al [16] and Li et al [17] explained different concepts and designs to solve the vibration issues for pump-controlled actuators.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Two Common Pump-Controlled Hydraulic Circuits for Single-Rod Actuators

2023

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Pump-controlled hydraulic circuits are proven to be more efficient than conventional valve-controlled circuits. Pump-controlled hydraulic circuits for double rod cylinders are well developed and are in use in many practical applications. Existing pump-controlled circuits for single-rod actuators experience oscillation issues under specific operating conditions; that is identified as a critical operating zone on the load-velocity plane. The challenge in these circuits is to find out the proper way to compensate for the differential flow at both sides of the cylinder in all operating conditions. The two main types of valves commonly used by researchers, to compensate for differential flow in single-rod cylinder circuits, are: pilot-operated check valves, and shuttle valves. In this research, a performance comparison between circuits equipped with either valves, in terms of the size of the critical zone and the oscillations’ characteristics, was accomplished. Simulation studies showed that the circuits that utilize pilot-operated check valves possesses smaller oscillatory zones and less severe oscillations, when compared to circuits with shuttle valves. Experimental work verified the simulation results and proved the accuracy of the mathematical models. Hence, pump-controlled circuits with pilot-operated check valves are recommended to be the basic platform for further efforts to solve the oscillation problem in pump-controlled circuits.

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“…In traditional load-sensitive systems, pressure feedback based on the maximum load pressure is used to achieve closed-loop control of system pressure, ensuring the required flow rate and pressure. When the demand flow rate of all participating actuators exceeds the maximum supply flow rate of the hydraulic pump, oil is first supplied to the low-pressure actuators due to parallel oil supply [9][10][11] . This satisfies the needs of the low-pressure actuators, and the pressure drop across the low-pressure control valve reaches the compensating pressure, at that point, the pressure compensator valve controls the flow rate.…”

Section: Introductionmentioning

confidence: 99%

A Review of Flow Saturation Resistant Techniques in Multi-actuators Load Sensing Hydraulic System

2023

jemm

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The multi-actuator load-sensitive (LS) system has gained widespread usage in engineering machinery applications due to its energy efficiency, exceptional composite action performance, and precise tuning capabilities. However, when the demand for load flow exceeds the supply of hydraulic pumps, flow saturation conditions may arise in hydraulic pumps, thereby impacting the coordination of multi-actuator actions and diminishing the load sensitivity characteristics of the system. To address this issue, scholars have proposed anti-flow saturation technology. Currently effective solutions include reducing the set pressure of pressure compensator valve springs and decreasing the opening degree of each main valve. Anti-flow saturation technologies for multi-actuator loadsensitive systems can be classified into three types based on the location of pressure compensators in different circuits: pre-valve; post-valve and outlet pressure compensation anti-saturation, as well as a novel type known as independent metering (IM) technology. This article provides an overview of significant accomplishments in these three types of antisaturation technologies before introducing IM technology and discussing research focal points for various types of load-sensitive systems as well as how anti-saturation technologies impact their energy efficiency. Finally, future directions for development in flow saturation resistant technologies within muti-actuators load sensing systems are explored.

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Review of Flow-Matching Technology for Hydraulic Systems

Cited by 9 publications

References 31 publications

An Electro-Hydraulic-Load-Sensitive System on the Basis of Torque Open-Loop Control

An Electro-Hydraulic-Load-Sensitive System on the Basis of Torque Open-Loop Control

A Comparative Study of Two Common Pump-Controlled Hydraulic Circuits for Single-Rod Actuators

A Review of Flow Saturation Resistant Techniques in Multi-actuators Load Sensing Hydraulic System

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