Design And Control Strategy Of Oil-electric-hydraulic Three-dimensional Hybrid Driving System For Heavy Dump Truck In Open Pit Mines

At present,the material transportation equipment in open-pit mines generally uses mining dump trucks,and their driving systems mostly use mechanical or electric transmission systems,which have shortcomings such as insufficient power and poor economy.Moreover,traditional single transmission methods are difficult to meet the harsh and complex driving conditions of open-pit mines.In recent years,the development trend of mining dump trucks has been towards high efficiency,high power,high economy,and heavy load.The market demand for heavy-duty dump trucks is increasing,and there is an urgent need to develop a drive system for heavy-duty dump trucks that has both strong power and strong economy.Combining the advantages of hybrid technology,this thesis proposes a new power split type oil electric hydraulic hybrid drive system with hydraulic drive for the front axle and double planet row coupling device for the rear axle to couple the power of the engine and the motor.Through the road spectrum data acquisition test,the open-pit mine cycle condition is established,and the oil electric hydraulic hybrid power system is designed and simulated.Firstly,the existing heavy dump truck drive system is analyzed and compared.The success rate of the transformation of the diesel electric drive system of XCMG XDE400 original model is analyzed.The split flow oil electric hydraulic three-way hybrid power system is designed.The hybrid power system architecture and the double planet row coupling device are designed.Based on the lever method,the working mode and energy flow of the whole vehicle are analyzed;Secondly,based on the goal of improving "power performance",the power matching calculation of the entire vehicle demand is carried out.The parameters of each power component and the entire vehicle are determined through parameter matching and selection design.Based on the selection design results,the AMESim physical model of the entire vehicle is constructed and the load performance analysis is carried out;Then,based on the objectives of the vehicle control strategy,the selection of control strategies and parameter design were carried out,and the mode switching and torque distribution schemes of the hybrid power system in different modes were analyzed and determined.The modeling of the vehicle control strategy was completed using MATLAB/Simulink;Finally,a road spectrum data collection experiment was conducted on a certain open-pit mine scene in Ordos,and the open-pit mine cycle operating conditions were established.The speed time and slope distance operating conditions of the dump truck during full load climbing and unloaded downhill were determined,in order to establish the open-pit mine cycle operating conditions that are in line with the actual scene.These conditions were imported into simulation software,and simulation experiments and comparative analysis were conducted with the optimization objectives of improving power and load capacity.The simulation results show that compared with the original model,improved power performance scheme reduces the acceleration time from 0-30km/h by 50.47%,increases the maximum speed and maximum climbing slope by 8.3% and 34.5%respectively,reduces fuel consumption per 100 kilometers by 12.53%,and has good working characteristics of the engine,motor,supercapacitor,and hydraulic accumulator.The overall power and economy of the vehicle are significantly improved compared to the original model;The simulation results of improving load performance show that,on the premise that the overall power performance of the vehicle meets the power performance indicators of the original model,the maximum load capacity of the dump truck can reach 498 t,which is 24.5% higher than the original model.The fuel consumption per 100 kilometers of the maximum load increased model is reduced by2.57% compared to the original model.The working characteristics of key components of the hybrid power system are reduced compared to the improved power performance of the modified model,but it can meet the driving conditions of open-pit mines.This thesis has 121 pictures,24 tables and 105 references.