The Research On Potential Energy Recovery Of Boom Hydraulic System In Hybrid Excavator

At present,with the continuous development of various countries' economies,humanity will face problems that have never been seen before.The energy crisis is the most serious and typical in these problems.In response to the energy crisis,many countries have taken corresponding measures and China has included energy conservation in its development plan.In order to ensure the implementation of the measure in various fields and contribute limited power to the development of our country and the whole human environment,the application of the hybrid technology is becoming more and more popular in all fields.With the continuous development of hybrid technology in the automotive market,mainstream manufacturers of various excavators began to combine hybrid technology with excavators in order to reduce energy consumption.In the research on the hybrid hydraulic excavator,it is a very significant task to recover the potential energy of its boom.In this paper,based on the analysis of the traditional hydraulic excavator working device,a hybrid hydraulic excavator arm energy recovery system is proposed,and the scheme design and parameter matching are studied.A system simulation model is established in AMESim software to analyze the impact of system key parameters on the efficiency of the energy recovery system.The specific work is as follows:Fiestly,the geometric and physical relationships of the excavator's boom,arm,and dug bucket were analyzed,and the kinematic model of each organization was obtained.The corresponding local coordinate system was established in the D-H coordinate system,Then the simulation model is established in AMESim for the working device of the hybrid hydraulic excavator.A comparison was made between the energy recoverable by the three hydraulic cylinders of the working device in one working cycle,and it was verified that the proportion of the potential energy of the boom is higher than that of the other two cylinders.Secondly,based on the actual conditions of the excavator and the advantages and disadvantages of the three major energy recovery schemes,a hydraulic motor-generatorhybrid hydraulic excavator arm energy recovery system was proposed.The system schematic was designed and the specifics were introduced the control process.Thirdly,a mathematical model was established for the dynamic pressure cylinder,the hydraulic pump,and the energy recovery motor,and then a flow continuity equation was established for the energy recovery motor inlet to prepare for the selection of the subsequent components and the modeling and simulation of the system.Established a simulation model of the excavator boom harvester system.According to the mathematical model of engine and hydraulic motor,the specific model and parameters were selected.The parameter matching meets the requirements of the system operating conditions and improves the energy recovery efficiency of the system.At last,the influence of the key parameters of the hydraulic system on the energy recovery efficiency was studied.A simulation model of the boom potential energy recovery system was established and the energy recovery system was simulated.It was verified that the excavator can work normally after adding an energy recovery system to the hydraulic cylinder of the hydraulic excavator boom.The influence of the parameters such as the type and displacement of the hydraulic motor on the efficiency of the energy recovery system was analyzed.Based on the results of simulation studies,the causes of several energy losses were analyzed.