Influence of the energy regeneration unit on pressure characteristics for a proportional relief valve

Lin, Tianliang; Chen, Qiang; Chen, Miao; Chen, Qihuai; Fu, Shengjie

doi:10.1177/0959651817692472

Cited by 9 publications

(5 citation statements)

References 7 publications

(7 reference statements)

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“…The bi-directional movement of the spool can be achieved controlling the on/off of the two switching valves. Lin TL et al [130,131] proposed a pilot-operated proportional pressure-reducing valve. Assume that the chambers at both ends of the main spool are A and B.…”

Section: Hydraulic Valve Drivementioning

confidence: 99%

Review of Recent Advances in the Drive Method of Hydraulic Control Valve

Li,

Yang

et al. 2023

Processes

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Hydraulic control valves are widely used in industrial production, agricultural equipment, construction machinery, and other large power equipment for controlling the pressure and flow of fluids in hydraulic systems. The driving method has a significant impact on the response and control accuracy of hydraulic valves. This paper reviews the driving methods of spools from five aspects: solenoid drive, material expansion drive, motor drive, hydraulic valve drive, and another drive. It summarizes the various schemes currently available for spool drive and analyzes each of them. After optimizing the driving method of the valve core, the control accuracy can reach 3%, and the minimum response time is 7 ms. According to the characteristics of the different drive methods, the differences between them are compared, the advantages and disadvantages of each drive method are analyzed, and the application scenarios for each drive method are identified. Solutions to the drawbacks of the existing drive methods are proposed, which provide directions for further optimization. We have found that solenoid drives are simple to control, low cost, and the most widely used. Material telescopic drives, motor drives, hydraulic valve drives, and other drives are costly, complex to control, and optional for use in special requirement situations. Based on the existing spool drive methods, an outlook on future drive methods is presented. This review facilitates a comprehensive understanding of the drive methods of hydraulic valve spools, points out the shortcomings of the existing drive methods, and is of great significance in improving the existing drive methods and proposing new drive methods. This paper has a positive effect on improving the control accuracy and responsiveness of hydraulic valves.

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Section: Hydraulic Valve Drivementioning

confidence: 99%

Review of Recent Advances in the Drive Method of Hydraulic Control Valve

Li,

Yang

et al. 2023

Processes

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“…To reduce the energy loss of the relief valve, a hydraulic energy regeneration unit (HERU) is connected to the outlet of the relief valve, which can increase the outlet pressure of the relief valve and thus reduce the pressure drop between the inlet and outlet [18], as shown in Figure 1. As there are many types of relief valves, the PRV is chosen as an example in this paper.…”

Section: Configuration Of Heru Of Energy Loss In Relief Valvementioning

confidence: 99%

Energy Regeneration Hydraulic System via a Relief Valve with Energy Regeneration Unit

et al. 2017

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Featured Application: This research aims to reduce the energy loss through the relief valve, especially in the systems where the system pressure is high or the overflow flow rate is large.Abstract: Relief valves are widely used in industrial machinery. Due to the outlet of the relief valve being connected to the tank, the pressure drop of the relief valve is frequently equal to the inlet pressure. Accordingly, the energy loss of the relief valve is very high in some cases and this will worsen with an increase in the rated pressure of the hydraulic system. In order to overcome the disadvantage of overflow energy loss in a relief valve, a hydraulic energy regeneration unit (HERU) is connected to the outlet of the relief valve to decrease the pressure drop between the inlet and outlet of the relief valve. The overflow loss, which is characterized by the pressure drop, can be reduced accordingly. The approach is to convert the overflow energy loss in hydraulic form and allow for release when needed. The configuration and working principle of the relief valve with HERU is introduced in this present study. The mathematical model is established to obtain the factors influencing the stability of the relief valve. The working pressure of the hydraulic accumulator (HA) is explored. Furthermore, the control process of the operating state of the HA is scheduled to decide whether to regenerate the energy via the HERU. The software AMESim is utilized to analyze the performance and characteristics of the relief valve with HERU. Following this, the test rig is built and used to verify the effectiveness of the proposed relief valve with HERU. The experimental results show that the relief valve with the HERU connected to its outlet can still achieve better pressure-regulating characteristics. The energy regeneration efficiency saved by the HA is up to 83.6%, with a higher pre-charge pressure of the HA. This indicates that the proposed structure of the relief valve with HERU can achieve a better performance and higher regeneration efficiency.

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“…In systems with fixed displacement pumps controlled by throttle methods, the predominant approach is to limit the operation of the safety valve (where serial throttle control is used). The introduction of proportionally controlled valves (a proportional relief valve or a proportional spool valve) can also result in a reduction in energy consumption by the hydrostatic system, particularly in a transient state [14,15].…”

Section: Introductionmentioning

confidence: 99%

A Case Study of Open- and Closed-Loop Control of Hydrostatic Transmission with Proportional Valve Start-Up Process

et al. 2022

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This paper concerns the start-up process of a hydrostatic transmission with a fixed displacement pump, with particular emphasis on dynamic surplus pressure. A numerically controlled transmission using a proportional directional valve was analysed by simulation and experimental verification. The transmission is controlled by the throttle method, and the variable resistance is the throttling gap of the proportional spool valve. A mathematical description of the gear start-up process was obtained using a lumped-parameters model based on ordinary differential equations. The proportional spool valve was described using a modified model, which significantly improved the performance of the model in the closed-loop control process. After assuming the initial conditions and parameterization of the equation coefficients, a simulation of the transition start-up was performed in the MATLAB–Simulink environment. Simulations and experimental studies were carried out for control signals of various shapes and for various feedback from the hydraulic system. The pressure at the pump discharge port and the inlet port of the hydraulic motor, as well as the rotational speed of the hydraulic motor, were analysed in detail as functions of time. In the experimental verification, complete measuring lines for pressure, speed of the hydraulic motor, flow rate, and temperature of the working liquid were used.

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Influence of the energy regeneration unit on pressure characteristics for a proportional relief valve

Cited by 9 publications

References 7 publications

Review of Recent Advances in the Drive Method of Hydraulic Control Valve

Review of Recent Advances in the Drive Method of Hydraulic Control Valve

Energy Regeneration Hydraulic System via a Relief Valve with Energy Regeneration Unit

A Case Study of Open- and Closed-Loop Control of Hydrostatic Transmission with Proportional Valve Start-Up Process

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