scholarly journals Flywheel-Based Boom Energy Recovery System for Hydraulic Excavators with Load Sensing System

Actuators ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 126
Author(s):  
Jiansong Li ◽  
Yu Han ◽  
Shaohui Li
Keyword(s):  
Energy Efficiency ◽  
Potential Energy ◽  
Energy Saving ◽  
Energy Recovery ◽  
Mechanical Energy ◽  
Control Circuit ◽  
Energy Recovery System ◽  
Load Sensing ◽  
Sensing System ◽  
Recovery System

A hydraulic excavator (HE) is a typical piece of construction equipment and is widely used in various construction fields. However, the poor energy efficiency of HEs results in serious energy waste and has aroused the attention of researchers. Furthermore, rising fuel prices and increasing stringent waste gas emission legislation sparked demand for ways to improve energy efficiency. Recovering the otherwise wasted boom potential energy of a conventional HE by proper methods offers the potential to improve the fuel efficiency of HEs. In this paper, a mechanical energy recovery system consisting of a pump/motor and a flywheel is presented for HEs using a load sensing system. When the boom moves down, the boom potential energy is converted into mechanical energy by the boom cylinder and the pump/motor to accelerate the flywheel. When needed, the captured energy stored in the flywheel is converted back into a form of pressure energy to directly drive the boom cylinder up without throttling the main valve. In the lifting process, a compound circuit that consists of a throttling control circuit and a displacement control circuit is presented. A control strategy is proposed to optimize the energy recovery and reuse procedure. A 4-t HE is used as a study case to investigate the energy-saving potential of the proposed system. Numeric simulations show that the proposed system, when compared with a conventional load sensing system, can reduce as much as 48.9% energy consumption in a non-loaded cycle of boom lifting and lowering process. As to a fully loaded case, the energy-saving rate is 16.9%. This research indicates the flywheel-based scheme is promising for developing an energy-efficient fluid power system for HEs and reducing energy consumptions.

Modeling and Simulation of Boom Potential Energy Recovery System in Hybrid Hydraulic Excavator

2013 ◽  
Vol 437 ◽  
pp. 217-221 ◽  
Author(s):  
Bao Yu Cao ◽  
Wei Li ◽  
Zhe Tong
Keyword(s):  
Potential Energy ◽  
Modeling And Simulation ◽  
Energy Saving ◽  
Energy Recovery ◽  
High Energy ◽  
Excess Energy ◽  
Hydraulic Excavator ◽  
Energy Recovery System ◽  
Recovery System ◽  
Hydraulic Cylinders

Hydraulic excavator energy-saving is important to relieve source shortage and protect environment. This paper mainly discusses the energy saving for the hybrid hydraulic excavator. By analyzing the excess energy of three hydraulic cylinders in the conventional hydraulic excavator, a new boom potential energy recovery system is proposed. At last, the model of the proposed system has been built by AMESim. The simulation result shows that the proposed boom potential energy recovery system has a high energy saving efficiency.

Overview and Optimized Design for Energy Recovery Patents Applied to Hydraulic Systems

2019 ◽  
pp. 256-285
Author(s):  
Marwa Elhajj ◽  
Rafic Younes ◽  
Sebastien Charles
Keyword(s):  
Energy Saving ◽  
Energy Recovery ◽  
Optimization Technique ◽  
Hydraulic Systems ◽  
Energy Recovery System ◽  
Construction Machinery ◽  
Recovery System ◽  
Hydraulic Excavators ◽  
Complete Study ◽  
Low Efficiency

Due to their large application quantities with extremely low efficiency, pollutant emissions, high fuel consumption, and oil price, researches on the environment protection and the energy saving of construction machinery, especially hydraulic excavators, become very necessary and urgent. In this chapter, the authors proposed a complete study for the excavators' hydraulic energy recovery systems. This study is divided into two parts. In the first one, an overview for the energy saving principles is discussed and classed based on the type of the energy recovered. In the second part and once the energy recovery system is selected, the authors proposed a new approach to design the energy recovery system under a typical working cycle. This approach, the global optimization method for parameter identification (GOMPI), uses an optimization technique coupled with the simulated model on simulation software. Finally, results concluded that applying GOMPI model was an efficient solution as it proves its accuracy and efficiency to design any energy recovery patent applied to hydraulic systems.

An electro-mechanical braking energy recovery system based on coil springs for energy saving applications in electric vehicles

Energy ◽  
2020 ◽  
Vol 200 ◽  
pp. 117472 ◽  
Author(s):  
Lingfei Qi ◽  
Xiaoping Wu ◽  
Xiaohui Zeng ◽  
Yan Feng ◽  
Hongye Pan ◽  
...  
Keyword(s):  
Energy Saving ◽  
Electric Vehicles ◽  
Energy Recovery ◽  
Energy Recovery System ◽  
Recovery System ◽  
Braking Energy Recovery

An energy recovery system for a hydraulic crane

2001 ◽  
Vol 215 (6) ◽  
pp. 737-744 ◽  
Author(s):  
X Liang ◽  
T Virvalo
Keyword(s):  
Energy Recovery ◽  
Energy Utilization ◽  
Energy Recovery System ◽  
Load Sensing ◽  
Recovery System ◽  
Hydraulic Load ◽  
Hydraulic Crane ◽  
Experimental Process ◽  
Commercial Applications ◽  
Theoretical Results

In this paper an energy recovery system for a hydraulic crane is presented. An assistant system with an accumulator is used to drive one joint of an example crane together with an electro-hydraulic load-sensing (ELS) system. The practical system is tested. The hydrostatic analysis of energy transfer is based on the experimental process and an assumed typical duty cycle. The experimental and theoretical results show that the application of the assistant system with the ELS crane system can recover and reutilize energy, save pump supply energy and improve energy utilization of the crane system. The success of its design and test in an example hydraulic crane will encourage its extension to different commercial applications in other lifting machinery.

Potential Energy Recovery System of Hydraulic Hybrid Excavator

2016 ◽  
Author(s):  
Pengyu Zhao ◽  
Yinglong Chen ◽  
Hua Zhou
Keyword(s):  
Potential Energy ◽  
Energy Recovery ◽  
Load Force ◽  
Dissipated Energy ◽  
Energy Recovery System ◽  
Hydraulic Hybrid ◽  
Recovery System ◽  
Parameter Matching ◽  
Hybrid Excavator ◽  
The Mathematical Model

For existing hydraulic hybrid excavators, the loss of energy is still too large and the energy recovery efficiency is not high enough. Concerning these issues, a new hydraulic hybrid excavator potential energy recovery system is proposed within this paper. The energy recovery system uses three-chamber cylinders (TCCs) and accumulators to recover the potential energy of mechanical arms and load of the excavator. The TCC consists of three chambers, including chamber with piston rod, chamber without piston rod and counterweight chamber. The counterweight chamber is connected to an accumulator, which provides average load force. The chamber with piston rod and the chamber without piston rod are connected to inlet and outlet of a variable pump respectively, constituting a pump controlled system together. The mathematical models of load, engine, pump, TCC and accumulator were established in this study. According to the mathematical model, the dynamic response was simulated and the dynamic characteristics of each components were analyzed. The parameter matching of accumulator was proposed as well. Besides, the simulation model was built and the simulation result was carried out. From the simulation, the dissipated energy of each cylinder was obtained and compared with the dissipated energy without potential energy recovery system. According to the comparison, the potential energy recovery system can reduce the dissipated energy of variable pumps by around 30∼60%, and reduce the dissipated energy of engine by around 50%.

Realization for New Type System of Energy Recovery

2013 ◽  
Vol 336-338 ◽  
pp. 65-68
Author(s):  
Lei Zhang ◽  
Yu Wang ◽  
Yu Xiang Jia
Keyword(s):  
Diesel Engine ◽  
Energy Recovery ◽  
Power Plants ◽  
Water Resistance ◽  
Low Cost ◽  
Mechanical Energy ◽  
Performance Testing ◽  
Energy Recovery System ◽  
Recovery System ◽  
Power Testing

In the performance testing for diesel engine, the load of power testing mostly used water resistance. The power generated by diesel engine all consumed by water resistance. The power and water wasted mostly by this way. Base on the existing mechanical energy recovery system means that the system adopt generator dragged by prime motor to generate recycle electricity, this paper introduces variable current energy recovery system. The power voltage inverts to 10kV voltage, and connects the power plants to the grid. Research shows that the system is low cost, energy saving. And it is achieved the ideal effect in power quality and economic benefit. At present, our company cooperates with a locomotive works for design and construction this system and ancillary plant.

scholarly journals A Novel Energy Recovery System for Parallel Hybrid Hydraulic Excavator

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Wei Li ◽  
Baoyu Cao ◽  
Zhencai Zhu ◽  
Guoan Chen
Keyword(s):  
Mathematical Models ◽  
Energy Saving ◽  
Energy Recovery ◽  
Simulation Models ◽  
Hydraulic Excavator ◽  
Recovery Efficiency ◽  
Hydraulic Motor ◽  
Energy Recovery System ◽  
Recovery System ◽  
Main Components

Hydraulic excavator energy saving is important to relieve source shortage and protect environment. This paper mainly discusses the energy saving for the hybrid hydraulic excavator. By analyzing the excess energy of three hydraulic cylinders in the conventional hydraulic excavator, a new boom potential energy recovery system is proposed. The mathematical models of the main components including boom cylinder, hydraulic motor, and hydraulic accumulator are built. The natural frequency of the proposed energy recovery system is calculated based on the mathematical models. Meanwhile, the simulation models of the proposed system and a conventional energy recovery system are built by AMESim software. The results show that the proposed system is more effective than the conventional energy saving system. At last, the main components of the proposed energy recovery system including accumulator and hydraulic motor are analyzed for improving the energy recovery efficiency. The measures to improve the energy recovery efficiency of the proposed system are presented.

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