Reducing Fuel Consumption in Hydraulic Excavators—A Comprehensive Analysis

Vukovic, Milos; Leifeld, Roland; Murrenhoff, Hubertus

doi:10.3390/en10050687

Cited by 62 publications

(37 citation statements)

References 17 publications

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“…When δ = 110 • , the pressure ratio approaches three, which indicates that the pressure range of the transformer is significantly extended by using this new type (maximum pressure ratio of the valve plate-rotating type is less than 2 [3,13]). (2) The test curve and the theoretical ideal pressure ratio curve (calculated from Equation (7)) follow the same trend. However, the test exerts a delay compared to the theoretical value due to the torque loss being neglected.…”

Section: Validation Of the Pressure Ratiomentioning

confidence: 61%

“…The hydraulic transformer is a power conversion unit in hydraulic systems, similar to a voltage transformer in electric circuits, which can solve the problem that the hydraulic system is not able to improve the pressure or eliminate the throttling losses. It indicates an approach to significantly improve the energy efficiency of the hydraulic system and to develop a constant pressure network, especially when considering nowadays the requirement of energy conservation and environmental protection [1,2]. Figure 1 depicts the basic principle of a hydraulic transformer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on the Pressure Ratio Characteristics of a Swash Plate-Rotating Hydraulic Transformer

Jing¹,

Zhou²,

Yuan³

et al. 2018

Energies

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This paper presents a theoretical model and its experimental validation for the pressure ratio of a swash plate-rotating hydraulic transformer. The structure and principle of the new type of transformer are described. The swash plate-rotating type can reduce the throttling loss caused by the valve plate in traditional hydraulic transformers. The theoretical model of the pressure ratio was derived based on the displacements functioning as the pump and motor in the transformer, accounting for the friction losses. A specific experimental setup including the prototype was established to validate the principle and pressure ratio of the machine. The results show that the transformer has a wider pressure range. The increase in pressure at port A and the rotating speed of the cylinder can reduce the pressure ratio slightly due to the torque loss. The present work indicates the useful potential of the swash plate-rotating hydraulic transformer.

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Section: Validation Of the Pressure Ratiomentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Research on the Pressure Ratio Characteristics of a Swash Plate-Rotating Hydraulic Transformer

Jing¹,

Zhou²,

Yuan³

et al. 2018

Energies

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“…The first contribution by Vukovic et al [2] addresses the important aspect related to the metric used to evaluate and lower the fuel consumption in mobile hydraulic machines. The authors conducted a comprehensive analysis of the components comprising the hydraulic machine and the cycles these machines usually perform.…”

Section: Fluid Power Systemsmentioning

confidence: 99%

“…New approaches for the analysis, modeling, and design of hydraulic and pneumatic components This book contains the successful invited submissions [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] to the Special Issue.…”

mentioning

confidence: 99%

Energy Efficiency and Controllability of Fluid Power Systems

Vacca

2018

Energies

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“…More recently a commercially available excavator uses hydraulic accumulators to recover energy from the swing function [41]. Also in the literature excavators Mobile hydraulic systems are frequently addressed as a suitable application for hydraulic hybridization, where [42,43] provide recent examples.…”

Section: Hydraulic Hybridsmentioning

confidence: 99%

On Energy Efficient Mobile Hydraulic Systems: with Focus on Linear Actuation

Heybroek¹

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In this dissertation, energy efficient hydraulic systems are studied. The research focuses on solutions for linear actuators in mobile applications, with emphasis on construction machines. Alongside the aspect of energy efficiency, the thesis deals with competing aspects in hydraulic system design found in the development of construction machines. Simulation models and controls for different concepts are developed, taking the whole machine into account. In line with this work, several proof of concept demonstrators are developed. In the thesis three main system topologies are covered:First, pump controlled systems are studied and a novel concept based on an open-circuit pump configuration is conceived. Special consideration is paid to multi-mode capabilities that allow for a broadened operating range and potential downsizing of components. Simulation models and controls are developed and the system is experimentally validated in a wheel loader application.Second, the possibility for energy recuperation in valve-controlled systems is investigated. In such solutions, a hydraulic motor, added to the meter-out port, is used for energy recovery during load lowering and in multi-function operation. Recuperated energy is either used momentarily or stored in a hydraulic accumulator. The proposed solution means an incremental improvement to conventional systems, which is sometimes attractive to machine manufacturers due to fewer uncertainties in reliability, safety and development cost. The energy recovery system is studied on a conceptual level where several alternative systems are proposed and a concept based on a two-machine hydraulic transformer is selected for a deeper control study followed by experimental validation.Third, so-called common pressure rail systems are considered. This technique is well established for rotary drives, at least for the industrial sector. However, in applying this technique to mobile hydraulics, feasible solutions for linear actuators are needed. In this dissertation, two approaches to this problem are presented. The first one focuses on hydraulic pressure transformers and the second one on secondary controlled multi-chamber cylinders. i ii Populärvetenskaplig sammanfattningHuvudtemat för denna avhandling är energieffektivisering av hydraulsystem. Forskningen rör främst linjära rörelsesystem inom mobila tillämpningar, med fokus på anläggningsmaskiner. Avhandlingen berör åtskilliga aspekter av systemdesign, där simulering och styrning av dynamiska system samt helfordonsmodellering är återkommande inslag. Ett led i forskningsstudien har varit att bygga in och utvärdera framtagna koncept genom fullskaliga demonstratorer. Ett flertal nya hydraulsystem har studerats inom tre huvudsakliga inriktningar: En första inriktning är mot så kallade pumpstyrda system, där ett nytt koncept baserat på pumpar anslutna i en öppen krets har utvecklats. Inom detta har smart reglering av ventiler visat sig vara central för att uppnå en hög energieffektivitet över ett brett arbetsområde. Konceptet vali...

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Reducing Fuel Consumption in Hydraulic Excavators—A Comprehensive Analysis

Cited by 62 publications

References 17 publications

Research on the Pressure Ratio Characteristics of a Swash Plate-Rotating Hydraulic Transformer

Research on the Pressure Ratio Characteristics of a Swash Plate-Rotating Hydraulic Transformer

Energy Efficiency and Controllability of Fluid Power Systems

On Energy Efficient Mobile Hydraulic Systems: with Focus on Linear Actuation

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