Vehicle Matching Control Of Pure Electric Loader And Its Power Economy Simulation

With the development of the times,the national "Made in China 2025" strategy is proposed,and the research trend of low-carbonization,greening,sustainability,and technical intelligence of construction machinery and vehicles is becoming increasingly hot.The country is undergoing vigorous construction and development.The energy consumption of traditional diesel engineering machinery vehicles used in infrastructure construction projects is huge.The electrification of engineering machinery vehicles has been widely studied as the main energy saving and emission reduction scheme.As a very important member of construction machinery vehicles,because of its shortcomings of large emission pollution,low energy efficiency,serious energy consumption and noise pollution,research on its electrification is inevitable.This paper proposes a research plan for pure electric loaders.Study the structural form and electrification matching scheme of pure electric loader,through the research of the loader 's driving drive system,hydraulic drive system control strategy,and braking energy recovery system control strategy,improve the dynamic requirements and Economic requirements to reduce its energy consumption and improve energy efficiency.This article relies on the support of Shanxi Science and Technology Platform Project(201805D121005)and Shanxi Province "1331 Project" key discipline construction plan project to carry out research work on pure electric loaders.The main research contents of the paper are as follows:(1)Analysis of power structure of pure electric loaderAnalyze 4 kinds of transmission forms,analyze and compare their advantages and disadvantages,and then determine the pure electric loader transmission form.The research is carried out from four aspects: the composition of the power source of the pure electric loader,the driving drive system,the hydraulic pump drive system and the braking energy recovery system.Determine the pure electric loader drive and drive scheme,and use a traditional diesel loader as a prototype for the calculation of oil-to-electricity matching and the basic structure design of the whole machine.(2)Machine control strategyDetermine the overall architecture of the pure electric loader drive control strategy.Starting from the power drive structure,combining the relationship between the accelerator pedal opening,the brake pedal opening,and the required drive motor torque,the control strategy of the pure electric loader's driving drive system and hydraulic pump work drive system is formulated,and the loading mechanism is targeted.Excessive energy consumption at the time of motion The control strategy of the braking energy recovery system is formulated from the relationship between the braking torque distribution of the front and rear axles of the loader and the braking force and the motor regenerative braking distribution coefficient optimization.(3)Build a complete machine model and control strategy simulation modelAccording to the structure of the pure electric loader established to ensure the reliability of the loader,a vehicle model of the pure electric loader is built in Cruise software,and the signal connection of the vehicle model is performed according to the power flow direction of the pure electric loader.The control strategy simulation model is built in Matlab / Simulink,and the output signal of the vehicle model in Cruise is used as the input signal of the control strategy simulation model to carry out joint simulation of Cruise software and Matlab / Simulink.(4)Simulation analysisAnalyze the influencing factors on the loader's working efficiency,analyze the simulation results of the pure electric loader,and verify the dynamic performance of the pure electric loader through the maximum speed,maximum traction,and maximum gradient;through simulation results of energy consumption and power battery SOC Verify the energy saving effect of pure electric loader.By comparing and analyzing the simulation results of the speed,maximum tractive effort,and maximum gradient of the conventional loader and pure electric loader,it is shown that the performance of the pure electric loader is 8% higher than that of the conventional loader,and the performance of the maximum climbability is increased by 9.9 %,Which fully shows that the pure electric loader not only meets its driving and working power requirements,but also improves the power performance of the prototype traditional loader.It also proves that the control strategy of pure electric loader in this paper is effective and accurate.After comparing the energy consumption curves of traditional loaders and pure electric loaders under the same working conditions,and comparing the effect of fuzzy control strategies on pure electric loaders' braking energy recovery systems on the energy consumption and SOC values of pure electric loaders,simulations were performed.The results show that when the loader passes a V-type operating condition,the pure electric loader saves energy by 14.6% than the traditional loader.The energy saving effect of the pure electric loader with the fuzzy control strategy has reached 15%,and the battery SOC performance has increased by 1.9%,which proves that the control strategy of the pure electric loader has achieved the energy saving effect and the accuracy of the fuzzy control strategy.