A hydraulic hybrid excavator based on multi-chamber cylinders and secondary control – design and experimental validation

Heybroek, Kim; Sahlman, Mika

doi:10.1080/14399776.2018.1447065

Cited by 32 publications

(15 citation statements)

References 6 publications

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“…In a digital hydraulic system, a piston pump can be turned on or off by the valves to control the distribution of flow of the intervals between several outlets and to match the demanded flow of the cylinder [55]. Compared with traditional systems, digital hydraulics can reduce considerable energy loss, especially during partial load [56][57][58]. Further study could focus on two or more actuators controlled by these digital pumps in digital hydraulics to reduce the partial load and decrease the installed power of the drive system [59].…”

Section: Energy Efficiency Improvement and Energy Saving Methods For mentioning

confidence: 99%

A Review on Energy Consumption, Energy Efficiency and Energy Saving of Metal Forming Processes from Different Hierarchies

Gao

et al. 2019

Processes

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Energy efficiency improvement and environmental impact reduction are emerging issues in the manufacturing industry. Aside from cutting, metal forming is also an important process in manufacturing. Metal forming is energy intensive because of the low energy efficiency of the used metal forming press. Although many literature reviews focused on the energy reduction and energy efficiency of machine tools, a comprehensive literature review of metal forming processes remains lacking because of the great difference between cutting machines and forming equipment. In addition, methods for energy efficiency and energy-saving still need to be promoted in metal forming. In this review, a novel hierarchy of the metal forming system was presented to describe the relationship among the equipment, process, and manufacturing system, providing a guideline of methods for energy efficiency and saving in metal forming. Then, existing energy consumption modeling and estimation theories and methods were discussed from two aspects. One is energy monitoring and modeling of metal forming equipment, and the other is process energy analysis of metal forming based on different parameters. On the basis of the hierarchy of the metal forming system, the present methods and technologies aiming to promote energy efficiency and energy saving effects were discussed from the aspects of equipment design and control, process optimization, and scheduling management and use. Thus, this review may serve as a reference for the decision-making of producers and managers to realize energy efficiency and energy saving at the system level. In addition, the major points that need attention are accurate energy models and control of forming equipment as well as the integrated optimization of equipment, process, and scheduling.

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Section: Energy Efficiency Improvement and Energy Saving Methods For mentioning

confidence: 99%

A Review on Energy Consumption, Energy Efficiency and Energy Saving of Metal Forming Processes from Different Hierarchies

Gao

et al. 2019

Processes

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“…𝑝 𝑃𝑢𝑚𝑝 = 𝑚𝑎𝑥(𝑝 𝑀𝐶,𝑃 , 𝑝 𝐶𝑜𝑛𝑣,𝑃 ) + Δ𝑝 𝐿𝑆 , (8) where Δ𝑝 𝐿𝑆 is the additional pressure difference for the load sensing system. The hydraulic power required by each load is calculated as…”

Section: System Modelmentioning

confidence: 99%

“…In a simulation study presented in [7] the effectiveness of the VDLA is also shown at a system level for a hydromechanical hybrid motion system for a wheel loader. In [8] results show a 34-50% fuel efficiency reduction for an excavator with a hydraulic system architecture based on the VDLA. Although the high efficiency results motivate a change to the architecture of hydraulic systems in mobile machines, it is noted that a significant redesign is required.…”

Section: Introductionmentioning

confidence: 98%

Improving the efficiency of valve-controlled systems by using multi-chamber actuators

Raduenz¹,

Ericson²,

Heybroek³

et al. 2021

Linköping Electronic Conference Proceedings

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This paper outlines how multi-chamber actuators can improve the efficiency of valve-controlled systems. Resistive control is a major source of energy losses in valve-controlled systems that share the same pump to drive multiple loads. In the proposed concept, by selecting different chambers, the load on the multi-chamber actuator can be transformed into different pressure and flow rate levels, allowing the adaptation of its load to the loads on other actuators. This can lead to a reduction of resistive control energy losses that occur between pump and actuators when driven simultaneously. Such systems are seen as an intermediate solution between resistive conventional hydraulics and throttle-less digital hydraulics. As a case study to highlight the possible efficiency improvement, a concept of a load sensing system with a conventional and a multi-chamber actuator is analysed. To determine its efficiency, the equations that describe its static behaviour are presented. Evaluating them for a set of load forces and speeds demonstrates how the load transformation occurs and how it can improve efficiency.

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“…Compared with basis valve controlled systems, the digital hydraulic system considerably reduces energy loss. Moreover, studies on the control algorithms as well as optimization of digital hydraulic systems have been conducted, which prove these systems have great application potential in industry or construction machinery [13][14][15][16]. However, energy recovery has not been studied for the digital hydraulic systems yet.…”

Section: Introductionmentioning

confidence: 99%

Development and Evaluation of Energy-Saving Electro-Hydraulic Actuator

2021

Actuators

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This paper will develop a novel electro-hydraulic actuator with energy saving characteristics. This system is able to work in differential configurations through the shifting algorithm of the valves, meaning that this developed system can be adjusted flexibly to obtain the desirable working requirements including the high effectiveness of energy recovery from the load, high velocity or torque. Instead of establishing the mathematical model for the purpose of the dynamic analysis, a model of the developed actuator is built in AMESim software. The simulation results reveal that the system is able to save approximately 20% energy consumption compared with a traditional without energy recovery EHA. Furthermore, to evaluate the accuracy of the model, experiments will be performed that prove strongly that the experimental results are well matched to the results attained from the simulation model. This work also offers a useful insight into designing and analyzing hydraulic systems without experiments.

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A hydraulic hybrid excavator based on multi-chamber cylinders and secondary control – design and experimental validation

Cited by 32 publications

References 6 publications

A Review on Energy Consumption, Energy Efficiency and Energy Saving of Metal Forming Processes from Different Hierarchies

A Review on Energy Consumption, Energy Efficiency and Energy Saving of Metal Forming Processes from Different Hierarchies

Improving the efficiency of valve-controlled systems by using multi-chamber actuators

Development and Evaluation of Energy-Saving Electro-Hydraulic Actuator

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