| On the basis of the centralized orient-driven motorized transport vehicle developed by the team,this paper takes the practicality and economy into account.This paper meets the transportation demand of increasing fruit and agricultural materials in some low-slow mountain orchards in the South.Combined with the practical application environment and performance requirements of the low-slow mountain orchard transport vehicle,the wheel motor drive technology is used to redesign the power system of the transport vehicle.Firstly,the dynamic parameters of power system of hub motor drive vehicle are calculated and matched in detail.The whole vehicle dynamic model is established on MATLAB/Advisor 2002 electric vehicle simulation platform.Based on the performance design parameters,the key components of the power system are selected and placed on the chassis of the vehicle to build a relevant experimental research platform.The ANSYS Workbench was used to analyze the structural statics of the rear axle of the transport wheel of the transport vehicle,and its strength and stiffness were checked and its fatigue life was estimated.The lighter simplification ratio of the whole vehicle was increased by 15.56%.Secondly,the electronic differential control strategy is researched and analyzed,and the independent differential steering control strategy is developed based on the actual operating conditions of the vehicle.An electronic differential system suitable for the hub motor drive transport vehicle based on steering angle and vehicle speed control is designed and the real vehicle road steering differential test is carried out.The test results verify that the electronic differential control system can meet the actual working requirements of the power system.Finally,the vehicle performance test of the power system of the hub motor driven transport designed in this paper is carried out,including the maximum speed,acceleration performance,maximum grade,minimum turning radius and driving range and energy consumption test and analysis.The test results are compared with the design indexes,the simulation results and the original models.The results showed that:(1)The maximum speed is 36.45 km/h,the acceleration time of 0-20 km/h and 20-35 km/h is 13.46 s,8.81 s,and the maximum grade is 23.09%,which is the highest than the original model when meeting the design requirements.The vehicle speed,acceleration performance and maximum grade were increased by 21.50%,10.27% and 20.59%,respectively,which further verified the accuracy of the performance matching design of the power system.(2)The minimum turning radius is 2400 mm and 2380 mm respectively,which is 17.59% lower than the original turning radius of 2900 mm,and the steering maneuverability is stronger;(3)The maximum mileage when driving at 20 km/h under no-load and full-load conditions is 66.97 km,46.33 km,energy consumption is 9.75 k Wh/100 km,13.46 k Wh/100 km,maximum mileage is increased by 32.37%,respectively.Its energy consumption is reduced by 10.27%.On the basis of meeting the design goals,it increased by 32.37% compared with the original model,and the energy consumption decreased by 10.27%;In order to investigate the driving range and energy consumption of the vehicle and the optimal combination of driving range and energy consumption,a three-factor and three-level orthogonal test was designed.The results show that:1)The load weight has the greatest influence on the driving range of the actual running of the transport vehicle,the road gradient is second,and the driving speed is the least among the three,that is,the battery energy consumption is the largest when the transport vehicle is fully loaded and climbing;2)When the combined load is 100 kg,the road gradient is 5.24% and the driving speed is 15 km/h,the vehicle has the highest driving range;the optimal combination of energy consumption is 100 kg and the road gradient is 5.24%,driving speed 20 km/h. |
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