Energy-saving in excavators with application of independent metering valve

Choi, Kook Hyun; Seo, Jaho; Nam, Yong-Yun; Kim, Kyeong Uk

doi:10.1007/s12206-014-1245-5

Cited by 50 publications

(35 citation statements)

References 2 publications

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“…By using the typical independent metering concept, the four-valve configuration with five distinct metering modes in [12], [13] and [14] can drive the cylinder to the desired trajectories. It allows energy regeneration and reduces the required pump energy subsequently, saves valuable energy.…”

Section: Conventional Independent Metering With Four Valvesmentioning

confidence: 99%

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A Study on Energy Saving of IMV Circuit using Pressure Feedback

Park¹,

Nahian²,

Anh³

2016

Journal of Drive and Control

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Abstract:In recent hydraulic actuation systems, conventional hydraulic spool valves with pressure compensators are becoming less popular, after the introduction of the independent metering concept for valves. Within this concept, four valves are needed for actuating a single cylinder. Subsequently, this increases the freedom of controlling both chamber pressures of the cylinder, and it then provides for electronically-controlled pressure compensation facilities. Additionally, this has the potential to save valuable energy. The primary focus of this paper is to develop a new generation of hydraulic circuits using the independent metering valve (IMV). This configuration can function well as a conventional IMV circuit while providing better pressure control. We first describe the working principles of five distinct modes of the proposed IMV system. Then, mathematical models for each working mode are presented. Finally, we present numerical simulations that have been carried out to evaluate the system performance, in comparison with that of the conventional IMV configuration. The simulation results demonstrate that the performance of the new IMV configuration is superior to the conventional IMV system in terms of energy savings.

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Section: Conventional Independent Metering With Four Valvesmentioning

confidence: 99%

“…[1] [13] Hence, the reference papers shown that the valve can meet high performance requirements of hydraulic systems. However, it has one degree of freedom.…”

Section: Introductionmentioning

confidence: 99%

A Study on Energy Saving of IMV Circuit using Pressure Feedback

Park¹,

Nahian²,

Anh³

2016

Journal of Drive and Control

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“…The output flow of the pump matches the speed of the actuator. However, the dynamic response of this scheme is still poor, which is also not suitable for rolling shear EHSSs.Another solution for reducing throttling losses is a separate metering system [16,17]. In the literature [18] based on separate metering systems, segmented speed and continuous displacement control strategies were proposed.…”

mentioning

confidence: 99%

“…Another solution for reducing throttling losses is a separate metering system [16,17]. In the literature [18] based on separate metering systems, segmented speed and continuous displacement control strategies were proposed.…”

mentioning

confidence: 99%

Characteristics of Position and Pressure Control of Separating Metering Electro-Hydraulic Servo System with Varying Supply Pressure for Rolling Shear

Su-hong

Huang

et al. 2020

Applied Sciences

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Featured Application: To improve energy efficiency while also ensuring position tracking accuracy, this paper gives the design and the analysis of a separate metering electro-hydraulic servo system with varying supply pressure for a rolling shear. This work is also suitable for similar engineering applications.Abstract: The traditional valve-controlled hydraulic servo system has large throttling losses and undergoes serious heat problems when used in electro-hydraulic servo systems (EHSSs) for a rolling shear. In order to improve the energy efficiency of the EHSS for the rolling shear while also ensuring the position tracking accuracy, the separate metering electro-hydraulic servo system with varying supply pressure (VSP-SMEHSS) is proposed in this work. The inlet valve controls the position of a hydraulic cylinder, while the outlet valve controls the back pressure of the hydraulic cylinder. However, due to the disturbance caused by the varying supply pressure, the proportional-integral-derivative (PID) controller or active disturbance rejection controller (ADRC) cannot meet the requirements of accuracy. In order to solve this problem, based on a nonlinear disturbance observer (NDO) and a tracking differentiator (TD), a dynamic surface control (DSC) is proposed in this work. Firstly, the stability of the controller is validated using the Lyapunov method. Then, experiments are conducted to verify the proposed control strategy. As a result, the hydraulic cylinder can accurately track the reference displacement signal and effectively reduce the pressure drop at the valve's orifice, due to which the hydraulic system achieves significant energy-savings. Compared with that of the EHSS, the energy consumption of the VSP-SMEHSS is reduced by 44.6%.Appl. Sci. 2020, 10, 435 2 of 18 undergoes significant throttling losses [1][2][3][4], which generates a lot of heat and affects the reliability of the system. High temperature during the process affects the control of the system. Therefore, improving the energy efficiency of the electro-hydraulic servo system (EHSS) while guaranteeing the tracking accuracy is a topic worth research attention.In order to reduce throttling losses of a valve-controlled hydraulic servo system, one solution is to use a closed pump-controlled system [5][6][7][8], which includes a fixed-displacement pump system driven by a servo motor and a constant-speed variable-displacement pump system [9,10]. The flow rate of the pump is varied to control the speed of an actuator. Due to this reason, theoretically speaking, there are no throttling losses. Due to obvious energy-saving effects, this technology has been applied to hydraulic systems of plastic injection molding machines [11]. However, this scheme has a poor dynamic response, and it is difficult to meet the high-response requirement of a rolling shear EHSS.Load-sensing technology is another solution to reduce throttling losses [12,13], and it is widely used in hydraulic systems of excavators [14] and steering systems of hydraulic power [15]. In the lo...

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“…Advanced architectural approaches to design and control high-flow rate hydraulic systems are demonstrated in concepts of independent metering (Shenouda, 2006), (Choi et al, 2015) and digital hydraulics (Linjama, 2011). The former utilises separate control of flows into and from actuator's chambers.…”

mentioning

confidence: 99%

Evaluation of steady flow torques and pressure losses in a rotary flow control valve by means of computational fluid dynamics

Okhotnikov

Noroozi

Sewell

et al. 2017

International Journal of Heat and Fluid Flow

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In this paper, a novel design of a rotary hydraulic flow control valve has been presented for high flow rate fluid power systems. High flow rates in these systems account for substantial flow forces acting on the throttling elements of the valves and cause the application of mechanically sophisticated multi-staged servo valves for flow regulation. The suggested design enables utilisation of single-stage valves in power hydraulics operating at high flow rates regimes. A spool driver and auxiliary mechanisms of the proposed valve design were discussed and selection criteria were suggested. Analytical expressions for metering characteristics as well as steady flow torques have been derived. Computational fluid dynamics (CFD) analysis of steady state flow regimes was conducted to evaluate the hydraulic behaviour of the proposed valve. This study represents a special case of an independent metering concept applied to the design of power hydraulic systems with direct proportional valve control operating at flow rates above 150 litres per minute. The result gained using parametric CFD simulations predicted the induced torque and the pressure drops due to a steady flow. Magnitudes of these values prove that by minimising the number of spool's mobile metering surfaces it is possible to reduce the flow-generated forces in the new generation of hydraulic valves proposed in this study. Calculation of the flow jet angles was analytically verified by measuring the deflection of the velocity vector using flow velocity field distribution, obtained during visualisation of the results of CFD simulations. The derived calculation formulas can predict metering characteristics, values of steady flow torques and jet angles for the specified design and geometry of the suggested valve. The proposed novel structure of the flow control valve promises to attain improved controllability, reliability and efficiency of the hydraulic control units of heavy mobile machinery operating at high flow rates regimes.

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Energy-saving in excavators with application of independent metering valve

Cited by 50 publications

References 2 publications

A Study on Energy Saving of IMV Circuit using Pressure Feedback

A Study on Energy Saving of IMV Circuit using Pressure Feedback

Characteristics of Position and Pressure Control of Separating Metering Electro-Hydraulic Servo System with Varying Supply Pressure for Rolling Shear

Evaluation of steady flow torques and pressure losses in a rotary flow control valve by means of computational fluid dynamics

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