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%.

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.

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