Research on the energy regeneration systems for hybrid hydraulic excavators

Lin, Tianliang; Wang, Qingfeng; Hu, Baozan; Wen, Guangrui

doi:10.1016/j.autcon.2010.08.002

Cited by 142 publications

(77 citation statements)

References 2 publications

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“…The percentage differences between simulated and experimental fuel consumption results, calculated according to Equation (6), are always within the combined uncertainty limits experimentally defined for each operating cycle:…”

Section: Model Validationmentioning

confidence: 99%

“…Lin et al [6] proposed an energy recovery system (ERS) for a hybrid excavator which combines the advantages of an electric battery and a hydraulic accumulator exploiting the regeneration power of the boom. Ho and Ahn [7] presented a novel hydraulic energy regenerative system based on a closed-loop hydrostatic transmission using a hydraulic accumulator as storage device to recover the kinetic energy of the load.…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic Hybrid Excavator—Mathematical Model Validation and Energy Analysis

et al. 2016

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Recent demands to reduce pollutant emissions and improve energy efficiency have driven the implementation of hybrid solutions in mobile machinery. This paper presents the results of a numerical and experimental analysis conducted on a hydraulic hybrid excavator (HHE). The machinery under study is a middle size excavator, whose standard version was modified with the introduction of an energy recovery system (ERS). The proposed ERS layout was designed to recover the potential energy of the boom, using a hydraulic accumulator as a storage device. The recovered energy is utilized through the pilot pump of the machinery which operates as a motor, thus reducing the torque required from the internal combustion engine (ICE). The analysis reported in this paper validates the HHE model by comparing numerical and experimental data in terms of hydraulic and mechanical variables and fuel consumption. The mathematical model shows its capability to reproduce the realistic operating conditions of the realized prototype, tested on the field. A detailed energy analysis comparison between the standard and the hybrid excavator models was carried out to evaluate the energy flows along the system, showing advantages, weaknesses and possibilities to further improve the machinery efficiency. Finally, the fuel consumption estimated by the model and that measured during the experiments are presented to highlight the fuel saving percentages. The HHE model is an important starting point for the development of other energy saving solutions.

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Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydraulic Hybrid Excavator—Mathematical Model Validation and Energy Analysis

et al. 2016

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“…Domestic universities are also actively studying hydraulic energy recovery technology, such as Zhejiang University, Central South University, Jilin University, etc. The energy recovery of boom and swing system in hydraulic excavator had also seen great progress [85].…”

Section: Electro-hydraulic Speed Smoothness Control and Energy Recovementioning

confidence: 99%

Review on Inlet/Outlet Oil Coordinated Control for Electro-Hydraulic Power Mechanism under Sustained Negative Load

Liu

Dong

2018

Applied Sciences

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Speed control and smooth regulation in an electro-hydraulic motion control system under negative load (over-running load) are crucial to mobile machineries, vehicles, and motion simulation equipment. Problems, such as bad natural stability, bad dynamic performance for small adjusting signal, serious coupling, and difficulty to coordinate between speed smoothness and speed regulation, exist in traditional valve-controlled and pump-controlled electro-hydraulic power mechanism. The coordinated motion control scheme, which is based on independent regulation of inlet/outlet oil for electro-hydraulic power mechanism has attracted the attention of many scholars. In the last two decades, many progresses had been made in coordinated control technology, employing in inlet/outlet independent metering and pump/valves independent regulation. Moreover, the technology has been widely used in the electro-hydraulic operating system in hydraulic excavator and the speed smoothness control system in heavy transport vehicles. In this study, recent advancements and upcoming trends in coordinated control and inlet/outlet independent metering for electro-hydraulic power mechanism under sustained negative load are reviewed. Firstly, related research advancements are summarized, including flow rate regulation mechanism based on inlet/outlet coordinated control, coordinated control strategy and nonlinear control method of electro-hydraulic control system. Then, nonlinear modeling of inlet/outlet independent metering and pump/valves independent regulation in electro-hydraulic control system is presented. In addition, the electro-hydraulic speed smoothness control and energy recovery for heavy engineering vehicles under long down-slope is discussed and reviewed. Finally, existing problems and future trends of inlet/outlet coordinated control for an electro-hydraulic power mechanism under sustained negative load are presented.

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“…However, the hydraulic effects are rather limited in the load range, for which the overall energy-saving effects of electrical types can be better. Lin et al employed hydraulic and electrical methods to recover the excavator boom potential energy [5]. The results have demonstrated that the hydraulic speed is the better choice compared to the electric one in controlling the speed of moving arms.…”

mentioning

confidence: 99%

Investigation of the Energy Regeneration and Control Strategy of a Crane Hoisting System

2018

SV-JME

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In recent years, fuel costs have risen dramatically due to the acceleration of energy consumption. Due to global warming, countries have enforced new requirements for energy-saving and emissionreduction in large construction machinery [1]. In the operation of construction machinery, it is possible to reuse and recycle energy because of the cyclic change of workload [2].The energy recovery system can be divided into hydraulic and electrical parts. Minav et al. proposed using a forklift as an experimental platform for comparing hydraulic with electrical recovery schemes in terms of fuel consumption and service performance [3] and [4]. It can be seen from the results that the hydraulic type is the better choice rather than the electric one in terms of fuel-saving rate. However, the hydraulic effects are rather limited in the load range, for which the overall energy-saving effects of electrical types can be better. Lin et al. employed hydraulic and electrical methods to recover the excavator boom potential energy [5]. The results have demonstrated that the hydraulic speed is the better choice compared to the electric one in controlling the speed of moving arms. Gong et al. showed that the potential energy of forklift is stored in the supercapacitor by the motor, where the experimental evaluation is also carried out. Specifically, comprehensive energy-saving effects of 20.8 % can be reached [6] and [7]. Yu and Kwan conducted simulations to analyse the boom potential of the excavator by hydraulic transmissions. Compared to the traditional accumulator recovery, it has not yet been experimentally verified [8]. Lin et al. considered the dynamic stability of hydraulic recycling and the economic nature of the electrical system [9]. Combining the advantages of hydraulic and electric recovery, the utility model can be applied to the recovery of the potential energy of the movable arm of the excavator. These results have demonstrated that the new system can increase the fuel-saving rate and reduce the installed capacity of the generator by 65 % compared to the traditional hydraulic recycling method.From the system structure perspective, the system can be categorized into series, parallel, and hybrid systems. Kwon et al. have investigated the series, parallel, and hybrid connection systems of excavator • According to the potential energy recovery rate, determine the energy recovery system operating conditions. Investigation of the Energy Regeneration and Control Strategy of a Crane Hoisting System• Describes the control strategy of the entire energy recovery system.

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Research on the energy regeneration systems for hybrid hydraulic excavators

Cited by 142 publications

References 2 publications

Hydraulic Hybrid Excavator—Mathematical Model Validation and Energy Analysis

Hydraulic Hybrid Excavator—Mathematical Model Validation and Energy Analysis

Review on Inlet/Outlet Oil Coordinated Control for Electro-Hydraulic Power Mechanism under Sustained Negative Load

Investigation of the Energy Regeneration and Control Strategy of a Crane Hoisting System

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