Design and analysis of compound potential energy regeneration system for hybrid hydraulic excavator

Potential energy regeneration system, which shares an electrical energy storage device with power system, can further improve the fuel economy of hybrid construction machinery without much additional expense. However, the conventional potential energy regeneration system also results in poorer dynamic performance of actuators in comparison to throttle-governing system. In addition, the capacity of the regenerator should be large enough to avoid overload. Based on comprehensive consideration, this article presents a compound potential energy regeneration system that combines the regeneration device and throttle together. The regenerative torque is adaptive to load so as to keep the pressure drop over the throttle almost constant, and then the actuator can be governed by adjusting the opening of the throttle. The compound potential energy regeneration system is analyzed and evaluated using the frequency domain method and nonlinear simulation. Finally, experiments under different parameter conditions are carried out, and some useful design reference is provided. The simulation and experimental results show the effectiveness of the designed system as well as its control strategy.

[1]  Zhang Yanting,et al.  Control strategies of power system in hybrid hydraulic excavator , 2008 .

[2]  Wei Sun,et al.  New Investigation in Energy Regeneration of Hydraulic Elevators , 2007, IEEE/ASME Transactions on Mechatronics.

[3]  Lujun Zhang.  An energy-saving oil drilling rig for recovering potential energy and decreasing motor power , 2011 .

[4]  Lasse Laurila,et al.  Storage of energy recovered from an industrial forklift , 2012 .

[5]  Juha J. Pyrhönen,et al.  Permanent Magnet Synchronous Machine Sizing: Effect on the Energy Efficiency of an Electro-Hydraulic Forklift , 2012, IEEE Transactions on Industrial Electronics.

[6]  Xiao Lin,et al.  Dynamic simulation and optimal control strategy for a parallel hybrid hydraulic excavator , 2008 .

[7]  Perry Y. Li,et al.  Open Accumulator Concept for Compact Fluid Power Energy Storage , 2007 .

[8]  X Liang,et al.  An energy recovery system for a hydraulic crane , 2001 .

[9]  Qingfeng Wang,et al.  Research on the energy regeneration systems for hybrid hydraulic excavators , 2010 .

[10]  Yanting Zhang.  Simulation and experimental research on energy regeneration with hydraulic motor for hybrid drive excavator , 2007 .

[11]  Masami Ochiai,et al.  HYBRID IN CONSTRUCTION MACHINERY , 2008 .

[12]  Kyongsu Yi,et al.  Development of supervisory control strategy for optimized fuel consumption of the compound hybrid excavator , 2012 .

[13]  Tae-Suk Kwon,et al.  Power Control Algorithm for Hybrid Excavator With Supercapacitor , 2010 .

[14]  Michael Rygaard Hansen,et al.  Regeneration of Potential Energy in Hydraulic Forklift Trucks , 2005 .

[15]  Lasse Laurila,et al.  Electric energy recovery system for a hydraulic forklift - theoretical and experimental evaluation , 2011 .